The very low content of gold in the ore to extract gold ore crushing and grinding and beneficiation methods of pre-enrichment or separation of gold from ore manipulation. Use more gold mineral re-election and flotation re-election law occupies a very important position in the placer gold production, the flotation method of rock gold mine wide use of the dressing method, about 80 percent of China\\ s rock gold mine using this method with gold, mineral processing technology and equipment have been greatly improved.
(A) Crushing and grinding
    According to the survey, with gold plant to use more jaw crusher for primary crushing, standard cone crusher machine broken, while crushing the short head cone crushing machine and roll crushing machine. Small with gold factory most of the two sections of a closed-circuit crushing, large with gold plant using three sections of a closed-circuit broken ore process.
In order to improve mineral production capacity, the equipment potential, and the crushing process was modified so that the grinding machine utilization factor increased, the main measures taken to implement and more broken and less grinding, and lower into the grinding of ore particle size.
(B) the re-election
    Re-election in rock gold mine application, as an auxiliary process, recovery of coarse gold in the grinding circuit, to create favorable conditions for the flotation and cyanidation process and improve the beneficiation indicators to improve the total recovery of gold to increase production played an active role and reduce costs. Shandong Province has about over 10 with gold plant using this process of re-election, the average total recovery can be increased by 2% to 3%, the economic efficiency of enterprises, according to incomplete statistics, the annual profit of several million dollars. Henan, Hunan, Inner Mongolia and other provinces (regions) to achieve good results, the main equipment used in the chute, shaker, jigger and short cone cyclone. Floating – heavy joint process (flotation tailings from the majority of our gold mines, with the re-election) is suitable for the future should be to promote the stage grinding stage sorting process, to promote this can be as early as received beneficiation principle.
(C) flotation
    According to the survey, about 80% of rock gold mine with gold flotation, the output of concentrate sent to more than the non-ferrous smelter processing. Cyanide gold extraction by the growing and businesses to enhance economic efficiency, reduce concentrate transport losses in recent years, the product structure of the larger changes, mostly to take place (of course due to the contradiction between the smelt and pricing and other issues, forcing the mine to place its own) to promote the flotation process development, a considerable position in the gold production. Usually there are two processes of flotation and flotation. New progress in recent years in terms of process transformation and reagent addition system, the flotation recovery has improved markedly. According to the country more than 40 selected gold plant, the flotation process indicators survey showed that the sulfide ore flotation recovery of 90%, a few up to 95% ~ 97%; rate was 75% in the oxidized ore; individual to achieve 80% ~~ 85%. In recent years, innovative transformation in the flotation process and scientific research many and obvious effect. Stage grinding and floating processes, re – floating process, etc., is the main trend of China flotation process development. Using heavy – floating process, such as Xiangxi Gold stage grinding stage sorting to get a better indicator, the recovery rate of more than 6%; Jiaojia gold, Wulong gold, gold, Wenyu Dongchuang gold also to obtain a certain effect. Again Xincheng Gold Mine, the original process for ore flotation, because of high mud (Ore mud, coupled with mining tailings filling strong enough, into the part of the sediment) beneficiation indicators continuous decline. Examine the test, the use of sediment sorting process, the recovery rate from 93.05% to 95.01% and concentrate grade of 135g / t to 140g / t, and stable production. Declining Jinchangyu Gold ore grade thus making flotation index lower, with the Shenyang Gold Institute in cooperation pilot study branch of the flotation process flotation concentrate grade. The research results (Gold Corporation in January 1988 passed the technical appraisal), a new revelation for the Flotation Process. Of course, the flotation method and other methods is not a panacea, not all gold-bearing ore are valid, mainly but also consider the nature of the ore, in the choice of process, the need for a wide range of demonstration and test.
In recent years, in order to improve the separation effect in the process of continuous improvement at the same time, the system of reagent addition and mixing medication made many improvements and automatic control of the dosing to achieve new progress.
(D) of the election – hydrometallurgical gold extraction process
    Amalgamation gold extraction
    Mixed mercury in gold extraction process is an ancient gold extraction process, both simple and economical, [FS: PAGE] suitable for gold recovery of coarse-grained monomer. Many gold mines in China also followed this approach. With the development of gold production and scientific and technological progress, the gold extraction process of the amalgamation has been improved and perfected. Due to increasingly stringent environmental protection requirements, some mine canceled amalgamation operations, replaced by the re-election, flotation and cyanidation gold extraction process.
    Mixed with mercury in gold extraction process is still an important role in gold production, application examples, both at home and abroad. Zhangjiakou, Hebei, Liaoning Erdaogou, Jilin Jiapigou, Shandong Yinan, etc. a lot of gold application of this technology. For the Liaoning Erdaogou gold original single flotation process, according to the nature of the ore to amalgamation and flotation processes, the total recovery rate of 7.81% (mixed with mercury recovery rate of 64.6%), and tailings grade of 0.74g / t dropped to 0.16 g / t year won the effectiveness of 158 million. Mixed with mercury in gold extraction process the key is how to take protective measures, elimination of toxic mercury pollution.
    Cyanide gold extraction process
    Cyanide gold extraction process is the modern main method of extracting gold from ore or concentrates. Cyanide gold extraction process include: cyanide leaching, leaching pulp washing filter, cyanide solution or a few of the basic processes of extraction of gold in the cyanide pulp and finished smelting. China\\ s gold mines existing cyanidation plant basically two types of gold extraction process, a class is based on the thickener continuous countercurrent washing, the recovery of gold precipitation with zinc replacement of the so-called conventional cyanide gold extraction process (CCD and CCF method), and the other without filtration and washing, the use of activated carbon without filtering of the recovery of gold from the cyanide pulp adsorption cyanide CIP process (CIP and CIL France).
    Conventional cyanidation gold extraction process was divided into two different materials: one is to deal with flotation gold concentrate or deal with amalgamation, re-election of the cyanide tailings plant. This process many large state-owned mines. Such as Hebei Jinchangyu; Liaoning Wulong Henan Yangzhaiyu; Zhaoyuan, Metro, Jiaojia Island Gold. Another is to deal with muddy oxidized ores, the use of whole mud mixing cyanide gold extraction plant. Such as Jilin trench; Heilongjiang Tuanjiegou,; Anhui Newbridge gold and silver mine and other mines.
    In the early 1930s have begun to use the cyanide gold extraction process. Chinkuashih gold in Taiwan in 1936 to 1938 period, the use of cyanide – zinc replacement process to extract gold, with an annual output of gold 150,000 two.
    Into the 1960s, in order to adapt to national economic development, vigorously develop the production of mined gold in some mines have adopted intermittent mechanical agitation cyanidation gold extraction process, and continuous stirred tank cyanidation gold extraction process to replace the percolation cyanidation The gold extraction process. In 1967, the first gold Mountain and exquisite with gold factory in Shandong Zhaoyuan continuous mechanical agitation cyanidation process produces gold cyanide gold extraction increased from 70% to 93.23%, from continuous mechanical agitation cyanidation gold extraction process rapidly in the major gold promotion. 1970 the annuity Jinchangyu gold 1977 Wulong gold cyanidation plant have been put into operation since the country began to put into operation a number of mechanical agitation cyanidation plant, the cyanide gold extraction process has entered a new stage of development.
    The continuous development of gold production and the rapid development of gold resources, muddy gold oxide ore since the 1980s a substantial increase in the development of all slime cyanide agitation leaching of such ores, and in Heilongjiang Tuanjiegou gold to build a day 500t ore cyanidation plant into production in 1983. Since then, the whole mud cyanidation gold extraction process increasingly promote the use of using this method worked in Henan, Jilin, Hebei, Shaanxi, Inner Mongolia and other places to build factories gold extraction. At the same time, to solve the difficulties of argillaceous oxide ore in the solid-liquid separation of the thick filter, Changchun Gold Research Institute in November 1979 of Tuanjiegou gold ore without filtering CIP gold extraction process carried out two-year pilot study has been successful. On this basis, in Spirit Lake gold mine in Henan Province in August 1984 to design the use of domestic equipment to the completion of processing 50t of ore in the first CIP gold extraction plant. Of cyanidation gold extraction process represents a major step forward. CIP gold extraction process to become one of the processing argillaceous rock gold mine oxide ore gold method of real estate. Built a CIP gold extraction plant in Jilin, Henan, Inner Mongolia, Shaanxi and other places since then.

Processing of laser cutting machine is a more complex process involving many factors, carefully check the content before cutting, cutting to observe monitoring. During processing, exception processing should immediately stop and check the reason, otherwise it will damage the machine or even hurt the personal safety, especially in the cutting of stainless steel, non-metallic materials.
Laser cutting professional computer-aided CNC programming software, work for the preparation of the part program is generally completed in offline computer. Some simple processing procedures can be completed in the editing interface of the CNC system, but it takes a long time, and can not be the programming of complex parts nesting. Generally do not advocate the preparation of the NC program in the CNC system because it takes a lot of machine time and inefficient. After the sheet is placed in the machine table, the important task is to determine the machining of the workpiece coordinate system, the workpiece coordinate system should be set and the programming of CNC coordinate system is exactly the same.
Note that in the beginning of the processing, a test cut stage, at this stage the operator should observe the processing, and adjust the processing parameters is particularly important for batch processing.
 

Hammer metal crusher internal disc structure, the axis must be rough (in the position to reveal the material), and after a certain heat-treated crude Tridacna gigas fine Tridacna gigas, so durable. Cutter on the S-shaped knife (made of confidentiality), a bike materials into the cabin when the first contact tool, it has the mandatory broken and the role of mandatory feed. Materials first contact by the S-shaped knife can bike material instantly smashed instantly broken up, such as briquetting. Then turned with a cutter, a bike materials into the bottom of the disk knife (blade or a hammer) to rotate with the cutter comes with the material rotary hammering, after after a few minutes until the bike material broken into less than the machine hole size of the bottom of the screen before the screen fall into the discharge port (technical problems because of confidentiality only by telephone consultation or detailed information to the factory to investigate before served), so to avoid peer manufacturers Zhaomaohuahu, involving material and other technical things The manufacturers Yigai evaded. I plant the production of metal crusher over the PSJ will-1000 models can be broken bicycle briquetting, which is also a large number of manufacturers can not solve the problem.

The crushing process consumes a large amount of mechanical energy.
   Most of the energy consumed in the formation of deformation and fracture of materials, only a small portion of the formation of the solid free surface. In 1867, Leitinggeer (PRvonRittinger) the area said, \"that:\" the process of breaking the power consumption of new materials generated in the process of breaking surface area is proportional to. \"1874 Jier Pi Geoff (В.Л. кирпичёв), in 1885 kirke (F.Kick), the Volume \", that broken when the power and volume of the material being broken or weight is proportional to\", suitable for crushing operations. Bond FCBond 1950) and Wang Rendong Crack, said: \"The fragmentation process of power and material cracks formed in the fragmentation process is proportional to the length of the now widely used in crushing the\" third universal theory \" , suitable for crushing operations.
Enter the crusher energy consumption, at the sound, the friction loss of heat, crusher wear parts and components, mechanical transmission, electrical losses and ore to produce micro-cracks and the formation of new surface. Except the last two for useful work, belong to the useless loss of energy. Studying new methods of crushing since the mid-1960s, such as combined heat, laser, high-speed airflow, vacuum, etc..

Accompanied by the rapid development of LED industry, China is gradually developed into a major production base and export base of the global LED lighting products, there are a large number of LED lighting companies of high quality LED products transported to the world, the LED lighting product certification starting to show its importance .

Inter-LED lighting product certification standards

China Certification: CCC certification

3C certification mark of the name of "China Compulsory Certification" (the English name for the "ChinaCompulsoryCertification", the abbreviation "CCC", also referred to as the "3C" sign.), The certification mark is a "catalog" products permitted to sell the factory, import and use of certification mark, indicating that the product safety and electromagnetic compatibility and electromagnetic radiation in line with the standards prescribed by the State who is a mandatory certification of products sold in our market must be forced through this certification.

North American certification: UL certification

UL certification is made in the U.S. private security testing agency – Underwriters Laboratories (UnderwriterLaboratoriesInc.) product safety certification. It is mainly for safety tests and inspections on a variety of devices, systems and materials. Products have passed UL certification is a ticket to enter the North American market. Overall, UL standards can be divided into: the requirements of the product structure, product raw materials used, the requirements for product components, test equipment and test methods, product logo and specification requirements . UL certification has become one of the world s most stringent certification.

EU Certification: CE certification

CE certification mark is a safety certification mark, the manufacturer is considered the passport to open and enter the European market. Those who posted the "CE" mark of the product can be domestic sales of the EU members are not required to meet the requirements of each member, in order to achieve the free circulation of goods in the EU member states within the. The EU market "CE" mark is a mandatory certification mark, in order to free circulation in the EU market, you must affix the "CE" mark to indicate that the product meets the basic requirements of the EU "technical coordination and standardization of the new approach" directives.

International Certification: CB Certification

CB certification is the IECEE (International Electrotechnical Commission IEC product safety certification organization) to develop a certification system, it is mainly for wire and cable, electrical switches, household appliances and other 14 categories of products. Have CB logo means that manufacturers of electronic products has passed the detection of NCB (an international certification body), the principle of mutual recognition of test results in the member countries of the IECEECB system to obtain the CB test book, the other Member States can apply for a certificate of competency, and use appropriate certified logo in the country. The CB Scheme is a the IECEE established a set of electrical products global mutual recognition system. Enterprise from which any member of the certification body to obtain the CB Test Certificate for other countries certified free from repetitive testing, recognition of the other members of the certification body, thereby to obtain the quasi-market into the country into the card.

In addition to the standard certification of these products, including the Chinese CQC voluntary certification, product safety certification of the Canadian Standards Association (CSA), product safety and quality certification of Germany TUV Rheinland (TUV), the Federal Communications Commission (FCC) Electromagnetic Interference standard certification or certification standards.

  Although the LED is from the early 90s of last century had already begun the application, but due to technical bottleneck constraints, until only in recent years as the technology to enhance and develop more slowly emerging light source to change the pattern of the global lighting industry. And LED products currently being irresistible force like in the global lighting market quickly spread.

       China\\ s lighting industry is in an unprecedented period of rapid development. Led lighting products with excellent color performance, variable discoloration strong ability to control, small size, easy to hide its longevity, energy efficiency, and stability characteristics of the LED products are used in the landscape lighting market, quickly led to the lighting market rapid growth, and help landscape lighting led lighting applications the largest market share in areas of the branch.

        With the acceleration of the urbanization process in China, the city at night image has also become an important measure to show the city of modern civilization, and local governments will accelerate the construction of the city led landscape lighting to enhance the city at night image included in the government work plan. At the same time, the specification of landscape lighting standards have been put forward, but also to promote the sustainable development of the landscape lighting industry in our country led.

        When the \"low-carbon economy\" and \"low-carbon life,\" a series of cutting-edge concept gradually into everyone\\ s vision, \"low carbon\" has become the subject of the urban landscape lighting. In the sustainable development dimension of the low-carbon energy-efficient landscape lighting, led landscape lighting products have made outstanding contributions.

         The upgrading of the urban landscape lighting, visual arts, not only to enhance the image of the city, but also people living in this city can feel more beautiful at night. Open landscape lighting, light up the visual arts, and more and more by the city manager\\ s attention to China\\ s urban landscape lighting project in full swing at the same time, but also greatly promote the development of led landscape lighting industry.

The sand system equipment is a production of construction sand and stone, special equipment, energy-saving than traditional sand making 50%. It can be made from a variety of rocks, gravel, river gravel in the building to go along with a variety of particle size of sand, sandy uniform particle size, high strength, than natural sand, the sand of the ordinary hammer sand production more building requirements that can enhance the quality of construction. Sand system equipment with reliable performance, reasonable design, convenient operation, high efficiency. Artificial gravel production line through the feeder, jaw crusher, crushing, respectively into the (sand making machine, counterattack crusher) through the vibration screening level required a variety of specifications stone, sand through the efficient sand washing machine get what you demand for refined sand, gravel production line is defined according to the type of discharge, the production of finished stone and artificial sand, also known as aggregates production line. Equivalent to a combination of stone production line and sand production line. Raw materials in road construction, construction plant, and often require sand and gravel material public production line, sets of aggregates production line equipment will be able to meet the needs of the stone and artificial sand at the same time production needs.

Laser equipment for industry and application materials are the results of numerous experiments, is absolutely true and reliable, welcome to negotiate.

Ruby Laser Equipment Co., Ltd. of Shenzhen City, is an innovative company established in the approval of the relevant state departments. The company is located in the high-tech capital – Shenzhen. Has its own modern assembly line factories, R & D and production laser cutting machine, laser cutter machine, laser die cutting machine, the semiconductor laser marking machine, YAG laser marking machine, CO2 laser marking machine, laser scribing machine, laser engraving cutting machine , laser engraving machine, laser equipment. I produced the laser scribing machine, laser marking machine, laser cutting machine, laser engraving machine, laser equipment, small size, good quality, excellent price, won the praise of the user.

In recent years, the box-type substation is the main direction of the rural power grids and substations construction, but on some there are still some shortcomings, specifically in:

    A fire problem: box-type substation is generally fully sealed unattended operation, although all the equipment, oil-free running and is equipped with a remote smoke alarm system, but the cabinets remain the fire hazards, such as: cable, compensation capacitors, etc., once the conflict The hair of fire, is not conducive to ventilation, is not conducive to fire fighting, it should be considered the design of automatic fire extinguishing system, but this will increase the manufacturing cost of the box-type substation.

    2, the expansion of the problem: the box-type substation due to the size and manufacturing cost constraints, the qualifying interval extension of the margin is small, If you want to add 1 to 2 qualifying interval is more difficult in the original box, you must increase the cabinet in order to to do so.

    3, repair the problem: the box-type substation at the time of manufacture, consider the manufacturing cost and enclosure size constraints, the smaller space of box-type substation maintenance, is not conducive to equipment maintenance, accident repair, which is the inherent inadequacy of the box-type substation, is unable to overcome the shortcomings.

    In short, look to the future, the box-type substation in the majority of our urban, rural, industrial and mining enterprises, public buildings and facilities will be widely used, the advantages of it for its inexpensive used more and more people, so that our the level of grid operation and then a new level.

 Overvoltage on roughly the following three conditions:

    (1) The line switch, pull the switch on the formation of the operating voltage.

    (2) system failures caused by short circuit or intermittent arc discharge over-voltage.

    (3) direct lightning or atmospheric lightning discharge, the pulse sensor in the transmission grid voltage wave.

    Over-voltage characteristics of short duration, the instantaneous amplitude. Usually over-voltage caused by the power system itself is little more than four times the transformer voltage, caused by atmospheric discharge or lightning over-voltage may exceed ten times As for the dozens of times.

    Only the latter duration very short in the microsecond order of magnitude. The dangers of over-voltage allows transformer insulation breakdown, adopted a series of lines and transformers on the structural design of protective measures to prevent the harm. Such as the installation of surge arresters, electrostatic ring, reinforced insulation, the center of ground over-current formation of the following two situations:

    (1) of the transformer load closing the instantaneous impact of current.

    (2) the secondary side load sudden short circuit accidents caused by overcurrent.

    Load switching current can reach 5-10 times the rated current, it transformer itself will not cause any harm, but it may cause malfunction of protection devices for small capacity transformers can be taken several times closing. will have to take special measures for large-capacity transformer.

    Secondary load short-circuit caused by the over-current, generally exceeds several times the rated current protection device failure or slow movement will cause direct harm. Huge short-circuit current in the windings have a great radial force out high voltage winding to low voltage winding. This force will coil snapped, bend or damage the insulation. Short-circuit current but also so that the copper loss than under normal circumstances, the rapid growth of hundreds of times, causing the internal temperature poly increase transformer burned.

    Therefore, operation should try to avoid a short circuit, usually in the design of relay and transformer structures are fully taking into account the short circuit accident.