As one of the latest technologies for extracting gold and silver , the heap leaching method is not only simple, but also the investment in infrastructure and equipment is about 20% to 50% of the chemical plant, and the production cost is about 40% of the cyanide plant. It is widely regarded as the most ideal way to extract gold from low-grade ore. Heap leaching is the deposition of low-grade ore or gold-containing scrap on an impervious floor. The ground is pre-equipped with a complete water supply and drainage system, and then leaching leaching is carried out by spraying a leaching agent such as cyanide on the heap. The gold-containing precious liquid after leaching is collected in a precious liquid pool through a pipe for gold extraction treatment, and this process is called heap leaching method for gold extraction. Its emergence has brought life to many small or low-grade gold and silver mines that were considered to be of no economic value in the early days, and made it possible to withdraw gold from gold-bearing waste rock abandoned from early mining. The fierce price of gold in the late 1970s accelerated the development of this law. By 1982, the number of large heap leaching plants in Nevada, Colorado, and Montana had grown to 27, with gold and silver production accounting for 20% and 10% of the total production of gold and silver in the United States in 1982. %. Since then, heap leaching has been widely used in Canada, South Africa, Australia, India, Zimbabwe, the former Soviet Union, and China.
In 1967, the US Bureau of Mines proposed a low-grade gold-containing oxidized ore by heap leaching. In 1969, a test report on heap leaching gold was officially released. In 1971, the heap leaching method was promoted and applied in mines such as Carlin and Kotitz in Nevada, USA. In particular, after the US Bureau of Mines researched the granulation heap leaching technology, the gold heap leaching technology has been rapidly developed. In 1980, the United States applied granulation technology to the industrial production of heap leaching. Due to the successful application of granulation heap leaching, a considerable amount of ore, waste and gold in the treated tailings were recovered, which greatly promoted the world gold. The development of production. In 1987, Wade applied the drip liquid system to the heap leaching of the Rochester gold mine. In the past, the spray rinsing technology of the heap leaching technology caused major innovations, all of which marked the trend of heap leaching gold extraction technology. Perfect and mature.
In the late 1970s, China began to research and promote the process of heap leaching and gold extraction. In 1979, the Science and Technology Department of the Ministry of Metallurgy issued a heap leaching test research project, which was then the Liaoning Provincial Gold Company, Liaoning Metallurgical Research Institute, Dandong. The three companies of the city's gold company took the first step in the domestic application of heap leaching technology. In 1980, the Changchun Gold Research Institute was commissioned by local gold mines to carry out heap leaching tests and industrial tests, which promoted the application of heap leaching technology. Other research units in China have also carried out heap leaching tests. In 1988, the industrial test of 10,000-ton heap leaching in Shuangwang Gold Mine of Shaanxi Province was successful. In 1991, the 110,000-ton heap leaching trial production of the Saerbulak gold mine in Xinjiang was successful, with an ore grade of 3.6 g/t and a total recovery rate of 87.75%. Its success has provided valuable experience for the design, construction and production management of large-scale heap leaching and gold extraction in China, and the main technical indicators have reached the international advanced level. Practice has shown that further expansion of heap leaching is one of the effective ways to increase China's gold production.
The average grade of ore currently used in the “dumping†method abroad is mostly 0.83~3g/t. Under the current international gold price of 450 US dollars / ounce as the benchmark, the ore boundary grade of the deposit is 0.465g / t (0.015oz / t) is more appropriate. The average grade of the mining area is between 0.8 and 1.8 g/t, when mining is profitable. Recently, with the promotion of the “heap leaching†method, many foreign mines have adopted “conventional†treatment of ore below 3g/t, and after being crushed by two-stage closed-circuit system, they are sent to the “heap leaching†site for “leachingâ€. (The mining and transportation costs of this part of the ore can be extended to the production cost of the high-grade ore in the conventional plant, thus increasing the recovery of gold and correspondingly reducing the total cost). The ore larger than 3 years old is sent to the conventional plant for treatment, so that the entire mine forms a "closed loop" system. After adding a small amount of sodium cyanide to the waste liquid of the conventional plant to reach the heap leaching requirements, it can be transported to the “stacking†site for spraying. The precious liquid after the “stacking†is sent to the “CIP†workshop in the conventional plant, that is, the carbon slurry workshop, and the gold is uniformly recovered. Mines of this production system often build "CIP" workshops and "heap leaching" fields first, and gradually build other production systems. The mine can produce gold in the year of construction, greatly improving the recovery of investment. This mode of production is worth learning from.
In 1967, the US Bureau of Mines proposed a low-grade gold-containing oxidized ore by heap leaching. In 1969, a test report on heap leaching gold was officially released. In 1971, the heap leaching method was promoted and applied in mines such as Carlin and Kotitz in Nevada, USA. In particular, after the US Bureau of Mines researched the granulation heap leaching technology, the gold heap leaching technology has been rapidly developed. In 1980, the United States applied granulation technology to the industrial production of heap leaching. Due to the successful application of granulation heap leaching, a considerable amount of ore, waste and gold in the treated tailings were recovered, which greatly promoted the world gold. The development of production. In 1987, Wade applied the drip liquid system to the heap leaching of the Rochester gold mine. In the past, the spray rinsing technology of the heap leaching technology caused major innovations, all of which marked the trend of heap leaching gold extraction technology. Perfect and mature.
In the late 1970s, China began to research and promote the process of heap leaching and gold extraction. In 1979, the Science and Technology Department of the Ministry of Metallurgy issued a heap leaching test research project, which was then the Liaoning Provincial Gold Company, Liaoning Metallurgical Research Institute, Dandong. The three companies of the city's gold company took the first step in the domestic application of heap leaching technology. In 1980, the Changchun Gold Research Institute was commissioned by local gold mines to carry out heap leaching tests and industrial tests, which promoted the application of heap leaching technology. Other research units in China have also carried out heap leaching tests. In 1988, the industrial test of 10,000-ton heap leaching in Shuangwang Gold Mine of Shaanxi Province was successful. In 1991, the 110,000-ton heap leaching trial production of the Saerbulak gold mine in Xinjiang was successful, with an ore grade of 3.6 g/t and a total recovery rate of 87.75%. Its success has provided valuable experience for the design, construction and production management of large-scale heap leaching and gold extraction in China, and the main technical indicators have reached the international advanced level. Practice has shown that further expansion of heap leaching is one of the effective ways to increase China's gold production.
The average grade of ore currently used in the “dumping†method abroad is mostly 0.83~3g/t. Under the current international gold price of 450 US dollars / ounce as the benchmark, the ore boundary grade of the deposit is 0.465g / t (0.015oz / t) is more appropriate. The average grade of the mining area is between 0.8 and 1.8 g/t, when mining is profitable. Recently, with the promotion of the “heap leaching†method, many foreign mines have adopted “conventional†treatment of ore below 3g/t, and after being crushed by two-stage closed-circuit system, they are sent to the “heap leaching†site for “leachingâ€. (The mining and transportation costs of this part of the ore can be extended to the production cost of the high-grade ore in the conventional plant, thus increasing the recovery of gold and correspondingly reducing the total cost). The ore larger than 3 years old is sent to the conventional plant for treatment, so that the entire mine forms a "closed loop" system. After adding a small amount of sodium cyanide to the waste liquid of the conventional plant to reach the heap leaching requirements, it can be transported to the “stacking†site for spraying. The precious liquid after the “stacking†is sent to the “CIP†workshop in the conventional plant, that is, the carbon slurry workshop, and the gold is uniformly recovered. Mines of this production system often build "CIP" workshops and "heap leaching" fields first, and gradually build other production systems. The mine can produce gold in the year of construction, greatly improving the recovery of investment. This mode of production is worth learning from.
1.Diesel engine brand options: PARKINS, CUMMINS, MERCEDES-BENZ MTU, MWM, DEUTZ, JICHAI series;
2.Alternator brand options: SHANHUA, GUANGZHOU ENGGA,WUXI STANFORD, SHANGHAI MARATHON, SIEMENS series;
3.Standard diesel generator set configuration:
Output type:three-phase&four-wire
Frequency:50HZ
Speed:1500RPM
Rated power:400/230v
Cooling type:closed water-cooling
Protection grade:IP23
Insulation grade:H
4.Optional configuration: 4 protection, self-starting, switching, rainproof generator set, container generator set, Silent Generator set, soundproof generator set,mobile power station.
5.The control system of genset with the mechanical speed governors system is the normao panel;The control system of genset with the electronic speed governors system and the electronic fuel injection system is the standard model.Diesel generator set power station using standard conditions,environment temperature:40℃;altitude:1000m relative humidity:60%.
1000-2500Kva Generator,Kva Silent Generator,Kva Silent Type Diesel Generator,Electric Diesel Generator
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