The prevention and control of mine environmental problems mainly include: prevention and control of “three wastes†(waste water, waste gas, waste residue), mine land reclamation and ground subsidence (collapse) in goaf, mudslide, karst collapse and other disaster prevention and control.  Exhaust gas management needles for various mining and mining industries  name  Total exhaust emissions  Purified amount  Processing rate  [100 million m 3 (standard)]  [100 million m 3 (standard)]  (%)  Coal mining and selection industry  3954.2823 386.9302 9.79 Ferrous metal mining and dressing industry  440.6246 254.5686 57.77 Non-ferrous metal mining and dressing industry  497.78 133.0291 26.72 Building materials, non-metallic mining and mining industry  415.1382 93.8557 22.61 Salt mining industry  101.3658 62.9993 62.15 Other mining and mining industry  4.7357 1.8139 38.3 total  5413.9266 933.1968 17.24 In recent years, Yunnan and Guizhou provinces have strengthened their environmental management of sulfur smelting by the local law, resolutely banned soil furnaces, and promoted new technologies for sulfur smelting. For example, Zhenxiong County of Yunnan Province has basically completed the technical transformation of sulfur smelting in the soil method, so that the recovery rate of sulfur is increased from 80% to 60%. The atmospheric concentration of SO 2 around the sulfur-smelting plant area has reached the national average of GB3095-82. Grade standard (<0.25mg/m 3 ), green plants grow normally at the sulfur plant.  Production, treatment and utilization of industrial solid waste in the country in 1997  Industrial solid waste  Smelting  Fly ash  Slag  Coal gangue  Tailings  radioactivity  (10,000 tons)  Waste residue  Waste residue  Production  65750 7460 12520 7218 11188 19266 248  Comprehensive utilization  30009 6294 6441 5438 5395 1284 　 Comprehensive utilization rate (%)  45.64 84.44 51.45 75.34 48.22 6.66 　 4. Land reclamation and waste slag site Land reclamation and land reclamation is the best way to control the ground subsidence, dumping site, tailings pile and open pit after the pit. It not only improves the mine environment. It also restores a large amount of land, so reclamation has far-reaching social, environmental and economic benefits. Bottom And Fly Ash Slurry Pump
Bottom And Fly Ash Slurry Pumps are the most comprehensive range of centrifugal slurry pumps for use in mining, chemical and general industry applications. It is including Horizontal Heavy Duty Fly Ash Slurry Pump, Horizontal Bottom and Fly Ash Slurry Pump and Centrifugal Fly Ash Slurry Pump. They are designed for heavy duty applications such as mill discharge, power sector and tailings as well as specialty applications, which are used for continuous pumping of high abrasive, high density slurry.
Product Features:
-Wear resistant metal or rubber wet end parts, long service life
Application Range:
Size: 25 mm to 450 mm
Maximum Heads: up to 75 m
Heavy Duty Fly Ash Pump,Horizontal Fly Ash Pump,Bottom And Fly Ash Slurry Pump,Horizontal Heavy Duty Fly Ash Pump SHIJIAZHUANG MUYUAN INDUSTRY & TRADE CO., LTD. , https://www.cnmuyuan.com
1. Waste gas treatment Mainly for the treatment of smoke and dust in kiln, material recovery and pollution in various production process waste gases. According to the statistics of 1985, the governance of the mining industry is shown in the following table. Where salt mining and ferrous metals mining industry the highest treatment rate, higher than the average level of 40 industries (44.06%), coal mining industry, the processing rate is the lowest, third last column in 40 industries. The processing rate of the entire mining industry was 17.24%, which was lower than the average processing rate of 40 industries across the country.
With the development of industry, exhaust emissions have shown an increasing trend (from 1993 to 1995, the growth rate was 10.36~15.04%), but since 1996, the growth has slowed down and the growth rate has shown a downward trend. This shows that with the implementation of the national policy of environmental protection, the efforts to control the “three wastes†have increased, and waste gas treatment has achieved certain results. [next]
2, wastewater treatment
The types of wastewater discharged from mines in China mainly include acid wastewater, wastewater containing suspended solids, salty wastewater and ore dressing wastewater. In order to prevent pollution to the environment, it is mainly to reform the process, update equipment, reduce the discharge of waste water and pollutants, and improve the reuse rate of water; to treat waste and treat wastewater as a comprehensive utilization of resources.
The processing and utilization capacity of mine water in coal mining and selection industry has increased rapidly. In 1990, the compliance rate of external discharge was 90.56%, and the utilization amount was 212 million tons. The coal washing water discharge and the loss of coal slime were reduced, and the coal washing plant that achieved the closed cycle of coal washing water was 100 in 1990.
In the past ten years, the non-ferrous metal industrial wastewater treatment technology has developed greatly, and wastewater treatment has evolved from single treatment to comprehensive planning and comprehensive management. The reuse rate of industrial water is catching up year by year. In 1973, it was only 12%. In 1987, it reached 58%. The recovery of valuable metals from wastewater has achieved initial success.
At present, the first problem is that the capacity of the wastewater treatment plant is insufficient. According to statistics, about 30% of the wastewater is directly discharged without treatment; the second is that the development level of wastewater treatment technology is not high; the third is the management of water conservation and wastewater treatment. The system is still not perfect.
3. Treatment of waste residue The treatment of mine waste residue is mainly comprehensive utilization, that is, the reduction of waste residue into resource and energy. This is an effective measure to protect the environment, protect primary raw materials, and promote production savings.
According to statistics in 1996, state-owned key coal mines used coal gangue to 34.7 million tons, accounting for 48.5% of the current year's emissions, including 8 million tons for power generation, 8 million tons of building materials, 3.6 million tons of building materials, 3.6 million tons of road materials, and 990 filling materials. Ten thousand tons.
From 1991 to 1997, with the development of industry, the discharge of solid waste increased, but its comprehensive utilization rate also increased (from 37.92% in 1991 to 45.64% in 1997); the total storage since 1996 Decline, the area has decreased since 1996.
In general, mining waste accounts for half of the country's total solid waste, but the disposal rate is the lowest, which has a great impact on the mine environment. From the perspective of various types of mining, the utilization rate of waste slag in coal and building materials non-metal mining and selection industry is higher, while the disposal rate of slag in ferrous metal mining and selection industry is higher.
[next]
Since the 1960s, some mines in China have been carrying out reclamation work in succession. In the past ten years, the work of reclamation has gradually been valued by various mines and achieved remarkable results. However, in general, China's current land reclamation rate is still low, but it is only partially or sporadically restored. The reclamation rate is only 1%, of which the metallurgical mine is higher, reaching 10%, which shows the arduousness of its reclamation.
5. Prevention and control of debris flow Mine debris flow usually occurs in the initial stage of dumping. As the amount of discharged waste increases and the strength increases, the slope stability of the dumping site is often improved and strengthened, and the mine debris flow is gradually weakened. The key to prevention and control of mine debris flow is prevention. The precautionary measures currently adopted in China mainly include the rational selection of the stripping site for the disposal of the site, the careful use of the “high step†method of disposal; the removal of the adverse effects of surface water on the stripping of waste; the planned arrangement of the rock pile Set; For the treatment of debris flow, biological measures (such as planting trees and planting grass) can be taken, but the time is long and the effect is slow. At present, in addition to strengthening the management of dumping sites and tailings ponds, most of the engineering control measures are adopted, mainly including barriers, drainage and spanning measures.
6. Prevention and control of karst collapse The prevention and control of karst collapse in China began in the 1960s. At present, there is a set of relatively stereotyped and mature methods. The key to prevention and control is to make scientific research on the collapse under the premise of mastering the mining area and regional subsidence laws. Evaluation and prediction, that is, adopting methods based on early prediction and prevention, supplemented by governance, and combined with prevention and control.
(1) Prevention of pre-collapse prevention The following main measures are taken: rationally according to the overall layout of mine construction; river diversion and drainage, avoiding subsidence areas; construction of extra-thick flood control dikes; control of groundwater level decline rate and prevention of sudden water inrush to reduce the occurrence of subsidence Construction of anti-seepage curtains to avoid or reduce the decline of groundwater level in the predicted subsidence area, to prevent the occurrence of ground collapse; establish a ground collapse monitoring network.
(2) The main control measures after subsidence are as follows: backfilling of collapsed caves; partial diversion of rivers and seepage prevention of river channels; comprehensive treatment.
7. The prevention and control of mine water balance damage is to prevent and prevent the water level damage caused by the drainage of groundwater, to protect groundwater resources, and to eliminate or reduce the environmental problems caused by groundwater collapse caused by drainage of groundwater, from 70 Since the beginning of the year, some mines have successively adopted anti-seepage curtains and anti-seepage walls to intercept the supply of groundwater in the surrounding area and achieved remarkable environmental and economic benefits. Such as Wang Zi stroke black iron ore using Impervious Curtain, the Danube river in Oita supply is being stopped, the effect of plugging up 61%. 
-Wide options for Impeller
-Various types of pump seals to suit different working condition
-Grease or oil lubrication
-Discharge branch can be positioned at intervals of 45 degree
-Can be installed in multistage series
-Easy to maintain
Capacity: up to 5000 m3/hr