Comprehensive utilization of mine resources and environmental protection

Shaanxi numerous varieties of non-ferrous metal, non-ferrous metals in recent years with high-priced running, resource development has formed a multi-channel, all-round pattern. The comprehensive utilization of resources and environmental protection have become the current pressing issues in the region. The performance of this Chinese company has become the key to this problem.

Current status of comprehensive utilization of resources

For many years, Jinduicheng Molybdenum Industry Group Co., Ltd. has adhered to the principle of development and utilization of “protection in development and development in protection” to rationally and scientifically mine mineral resources. The approved mining recovery rate of Jinduicheng phase deposit is 96%~97%, the mining depletion rate is 3%~4%, and the ore recovery rate is 86%. In recent years, the average mining recovery rate of the group has been 97.4%. The ore depletion rate is planned to be 1.5% and the ore recovery rate is 87%. In addition, while the gold and molybdenum group is developing and utilizing the main mineral phase, it also recycles the associated mineral copper , sulfur and iron . The copper recovery rate is 85%; the sulfur recovery rate is 74%; and the iron recovery rate is 42%.

Mother Temple in Shaanxi silver mining companies to strengthen mining processes, ore secondary crushing and transport links management, reducing ore loss and improve the utilization efficiency and recovery rate of mining resources, mining recovery rate increased every year. By beneficiation technology transformation, the lower ore grade at 1.72 percentage points situation, but to improve the recovery rates, the current zinc recovery rates reached 96.26%, lead recovery rates reached 91.84 percent.

Shaanxi Fengxian Sifang Gold Mine Co., Ltd. through the scientific research and technical transformation, the 12 waste rock yards and the heap leaching slag left in the history of the company before the establishment of the company under the technical conditions at that time were considered to have no recovery value. Selection, comprehensive utilization (paving roads), and the construction of slag walls or slag dykes, not only recycling resources, but also eliminating potential pollution hazards and improving the ecological environment.

Shaanxi Leading Mountain Mining Co., Ltd. invested 7 million yuan in 2004 to carry out comprehensive utilization of resources, built a zinc oxide production line, and processed more than 20,000 tons of originally abandoned oxidized ore, which not only created good economic benefits, but also recovered valuable Resources.

Shaanxi Silver Mine has comprehensively recovered the magnetite in the off-balance copper mine and tailings for the specific situation of good metal market price. With an annual output of 10,000 tons of copper concentrate and iron concentrate. It has increased economic benefits and recycled natural resources.

Current status of environmental management in mining areas

In recent years, Jinduicheng Molybdenum Industry Group Co., Ltd. has implemented pollution prevention measures and capital investment for the weak links in the mining area. Up to now, it has invested more than 7,000 yuan and completed more than 30 governance projects. In particular, in the past five years, the proportion of investment has been increased, the pace of pollution control has been accelerated, and the focus of governance work has been on the treatment of wastewater discharge from beneficiation, tailings leakage, industrial boilers, kiln, process waste gas pollution control, etc. : (1) Renovate the tailings conveying pipeline to more than 8,200 meters, and promote the use of wear-resistant cast stone pipelines of more than 4,200 meters. (2) Renovation of 5 tailings accident pools and sewage recovery tanks with an additional storage volume of 3,885 cubic meters. (3) Renovate 7 tailings sewage pumping stations and add 8 sets of new tailings conveying sand pumps. (4) Renovate 107 sets of flotation equipment , replacing the A-type flotation machine with a 24 m3 flotation machine with high efficiency, energy saving and small floor space. (5) Renovation of the mineral processing and return water facilities, and increasing the return water by 22,500 tons. (6) Renovation of 2 sets of molybdenum concentrate drying equipment, the company's concentrating plant used steam drying technology to replace the rotary kiln with high energy consumption, high labor intensity and large environmental pollution, and changed the working environment. (7) A comprehensive renovation of the boiler dust collector of more than 10 tons was carried out, using a wet stone dust collector to replace 10 sets of mechanical cyclone dust collectors with low efficiency, high energy consumption and fast wear. (8) casting, forging are heated using electric heating and the soil of coal gas not only meets the requirements of the production process, and completely replace the low thermal efficiency of coal-fired heating polluting reverberatory furnace, significantly improved the environmental quality, much labor intensity Reduced. (9) Comprehensively controlled the Muzigou tailings reservoir, rebuilding the soil on the accumulating dam surface, planting grass, and curing the pollution problem of tailings loss and flying. (10) Invested more than 2.4 million yuan, and reused the water in the tailings pond. (11) Invested more than 4 million yuan to carry out anti-corrosion transformation on the flue of three boilers in Baihua, Yumudi and Siping, which not only ensured the normal operation of winter heating, but also solved the environmental pollution problem. (12) Invested nearly 3 million yuan to completely renovate the original domestic sewage treatment system. Jinduicheng Molybdenum Industry Group relies on scientific and technological progress to cure environmental pollution and accelerate the pace of scientific and technological achievements. In the course of more than 20 years of scientific research, we have been focusing on the major scientific research topic of non-cyanide molybdenum selection, persisting in overcoming difficulties, and experimenting with the development of high-efficiency, non-(micro)toxic beneficiation agent-sodium thioglycolate instead. The highly toxic mineral processing cyanide has been promoted and used in the concentrator for more than ten years. It has filled the air and non-toxic molybdenum beneficiation at home and abroad, and has produced huge social and environmental benefits. It has been confirmed by the State Environmental Protection Administration as a promotion project.

Shaanxi Fengxian Sifang Gold Mine Co., Ltd. has adopted a series of environmental management restoration measures for many years, with an accumulated investment of 2.8 million yuan to control the environment, building 2,986 meters of flood control dykes, 1,500 meters of hardened roads, 54 acres of green sidewalks and living welfare areas. The heap leaching field was closed and the discharge of the heap leaching residue was controlled from the source. Since 2000, the high-temperature and high-pressure cyanide-free analytical electrolysis system has been used to reduce the single consumption of sodium cyanide for the analysis of tons of gold charcoal from 50 kg/ton to zero. According to the current resolution, the amount of sodium cyanide is reduced by 40.2 tons. Since 2003, the oxygen-rich leaching technology has been used to reduce the single consumption of sodium cyanide from 385 g/ton to 192 g/ton. According to the current annual processing of ore, the actual consumption of sodium cyanide is saved annually. 162.51 tons, the two total reduced the amount of sodium cyanide 202.71 tons, saving the ore dressing cost of 3.01 million yuan.

In recent years, Shaanxi Leading Mountain Mining Co., Ltd. has invested more than 8 million yuan in environmental management of mining areas. Multi-channel dams have been built in the waste slag yard to prevent possible damage caused by geological disasters; key protection for tailings ponds, artificial soil covering on the dam surface, planting “Desert King” grass species, not only strengthened The dam is stable while avoiding water loss.

Current status of soil and water conservation and land reclamation in mining area

Jinduicheng Molybdenum Industry Group Co., Ltd., in order to prevent soil erosion to the utmost extent, according to the “Jinducheng Molybdenum Production Water and Soil Conservation Plan” prepared by the Shaanxi Provincial Soil and Water Conservation Survey and Planning Institute, and the need for the production and living of soil and water conservation facilities within the jurisdiction of the company , invested 2.2 million yuan in 2005, on the north ditch waste discharge waste discharge field red Flag ditch segments soil and water conservation, construction of reinforced concrete retaining wall dregs 2.3 million m ^3, the entire slope to form a step dig slag 107,500 m ^3, the construction of drainage stairs Ditch and main drainage ditch 1450 m ³ . In 2006, it invested another 2.3 million yuan to complete the construction of the 29th dam of the Muzigou tailings pond, the construction of the dam surface, the dam surface drainage ditch and the dam shoulder intercepting ditch; the 31st road of the Lixi tailings reservoir was completed. The construction of dam dam slope masonry, dam surface covering and dam surface drainage ditch, dam shoulder intercepting ditch; completion of the rear end of the explosives plant to build a retaining wall to intercept upstream mining slag and mountain soil.

Shaanxi Yinmusi Mining Co., Ltd. has invested a total of 2.48 million yuan in recent years, completing the retaining wall of 6,788 ^m3 , greening 33,459 ^m2 , and covering 1,600 ^m3 . By adopting measures such as covering soil and afforestation and reclaiming wasteland in the slag pile and tailings pond, the mining area will form a green protective layer to achieve soil and water conservation and economic benefits.

The Fengfang Sifang Gold Mine Company of Shaanxi Province rehabilitated the temporary tailings pond of the Xihe River and the temporary tailings pond of the Ministry of Mines, forming a high standard farmland of 164 mu, which was delivered to the villagers for cultivation; the permanent tailings pond of the waste grass ditch was completely in accordance with the design plan. Each sub-dam is rehabilitated and planted. Effectively prevent soil erosion in the reservoir area and dam slope.

Shaanxi Leading Mountain Mining Co., Ltd. implemented key protection for the tailings pond, and artificially covering the dam surface, planting the “Desert King” grass species, not only strengthening the stability of the dam, but also avoiding soil erosion.

Shaanxi Jianchaling Mining Company recovered 66 acres of cultivated land damaged by asbestos tailings for the local community.

Current problem

1. The progress of waste residue management is not great. With the expansion of production scale, waste slag emissions have increased year by year. The waste rock in mining, tailings in beneficiation, sintering slag in smelting, leaching slag, and slag generated in flue gas recovery have caused great development. obstacle. Although some companies have already begun to carry out comprehensive management and have made some progress, there are still many companies that have not made breakthroughs in this regard. At present, the treatment of solid waste has caused great pressure on mining and smelting enterprises. The treatment cost has been increasing year by year, and the land for discharge has become increasingly tense. Therefore, it is necessary to explore new ways to deal with tailings, waste rock and waste residue as soon as possible, which is not only the foundation of long-term development. Requirements are also an urgent need for current production.

2. The tailings storage capacity is becoming increasingly tight. Shaanxi Nonferrous Metals Group Co., Ltd. has 24 tailings reservoirs, one is under construction, and 10 have entered the middle and late service stage. These tailings reservoirs entering the middle and late stages generally have the problem of requiring capacity expansion for subsequent production. At present, companies are arranging near-term production and long-term planning, and preparing for long-term demonstrations and two-handed plans.

3. The proportion of science and technology investment is small, which is extremely disproportionate compared with the industrial scale and economic benefits. The enterprise is centered on economic benefits, but it has forgotten the famous saying that "science and technology are the primary productive forces." Scientific and technological innovation is related to long-term interests, and should be highly concerned and well-organized. Looking back on the past, our achievements in safety, environmental protection, energy conservation, mining and metallurgy recovery rate and processing yield are all shining with technological innovation and the introduction, digestion and absorption of innovation. Therefore, increasing investment in science and technology will inevitably bring value-for-money returns to our work in the future.

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