China's tailings comprehensive management still has a long way to go

Middle of this month, Tangshan Environmental Protection Agency recently focused on the local 128 pollution-related environmental protection enterprises thorough investigation, where volume of 300 cubic meters of blast furnace demolition of all, including 40-50 at home more than 30 steel mills and coking The factory has stopped production and rectification, causing a lot of sensation in the industry. It can be seen that the control of environmental pollution has been placed in a more important position.

In the case of ore, improper handling of tailings is the main cause of environmental pollution. At present, China's tailings pond is still mainly based on stockpiling, which has great drawbacks. In the mining area that we have studied in the field, the slurry of the tailings is discharged to the storage area, causing cross-flow of sewage, and the piled area is very large, the pile is very unstable, and the rain is easy to cause the landslide of the nature of the debris flow.

According to the statistics of relevant departments, as of the end of 2011, there are 11946 tailings ponds in China, and the total amount of tailings stored in various types is about 8 billion tons, mainly concentrated in North China, Northeast China and Central China. The number of small tailings ponds is 95. %the above. From the perspective of safety assessment and environmental assessment, 43.36% of the total number of people who have not passed the safety assessment and 64.5% of the total who have not conducted environmental assessment.

These large and widely distributed tailings ponds have become important sources of environmental pollution and serious public safety hazards, some hanging like overhead bombs.

Taking into account China's coal mines and metal mines to use more underground mining, surface subsidence caused by over-exploitation will, on the surface of farmland, buildings, roads and damage the ecological environment is very serious. The best way to handle the tailings powder is to simply fill the tailings, plan to fill the gobs, and leave the underground space for future use for new use.

Filling the goaf is an important way to eliminate the tailings in large quantities. The technology combines the concentrated tailings and cementitious materials into a certain composition of fillings, filling the abandoned tunnels and goafs, and finally forming a filling body with a certain strength. Each cubic goaf can be filled with about 2 tons of tailings, and all the goaf can be filled with 100% of the tailings that can consume the ore, which can completely remove the tailings.

Moreover, through the cementation filling of the goaf, on the one hand, it can eliminate the safety hazard of the underground mining empty area, avoid the ecological damage caused by the collapse of the goaf, and at the same time replace the pillar with the filling body, which is beneficial to improve the recovery rate.

In order to rectify the tailings pond, the relevant state departments have issued a series of policies and measures. After comprehensive management, they have achieved certain results, but there are still many problems, such as the failure to implement the main responsibility of the enterprise and the imperfect supervision of the construction of the tailings pond. Fubao News believes that the comprehensive management of tailings ponds still has a long way to go.

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