Dry-type cement filling method realized by aid of extracted tail salt of salt deposit

Abstract

The invention relates to a dry-type cement filling method realized by the aid of extracted tail salt of a salt deposit. The dry-type cement filling method is characterized in that a filling material in the method is tail salt remained after beneficiation processing of sylvine or carnallite ores; the main ingredients of the tail salt are NaCl or NaCl and MgCl2; the filling material is solid, and is conveyed in a well by modes of drop shaft sliding, underground automobile conveying, belt conveying and the like; the filling method is used for cement filling; and when the main ingredients of the tail salt are NaCl and MgCl2, cementing agent is added in the filling material, and is clay or saturated NaCl brine. By the aid of tail salt dry-type cement filling, a filling body with the certain strength can be formed in a hollow area, damage of ore pillars and surrounding rocks can be prevented effectively, surface collapse and subsidence are prevented, and recovery safety is maintained. A large quantity of tail salt is utilized, occupied area of stacked tail salt is greatly reduced, and the ground surface of a mining area and surrounding ecological environments are protected effectively.

Description

Technical field [0001] The invention relates to a method for filling the goaf of a ore deposit, in particular to a dry cement filling method for mining tailings from salt deposits, which is suitable for underground mining of potash or carnallite deposits. Empty areas are filled. Background technique [0002] There are mainly two types of filling methods in the prior art. The mined area formed by the mining of salt deposits is filled with liquid, and the material is mainly saturated brine; the mined area formed by underground mining of metal and non-metallic deposits generally uses tailings. Sand cement filling. [0003] The method of filling the mined-out area with saturated brine is generally only applicable to salt deposits mined in water. When salt deposits are mined in water, saturated brine is filled in the cave after mining to support the roof and protect the surface from ground collapse. However, when the salt deposits adopt underground mining, there are a large number of...

AI Technical Summary

Problems solved by technology

For example, cemented filling with sand, stone and other materials can form a stable filling body to meet the filling requirements, but a large amount of tailing salt processed from salt ores can only be piled on the ground, which not only takes up a lot of land but also has adverse effects on the environment.

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