Method for mining underground sodium sulfate decahydrate by drilling hot water dissolving

Abstract

The invention relates to a method for mining underground sodium sulfate decahydrate by drilling hot water dissolving. The method comprises the following steps of A, well distributing, drilling a vertical well (1) in the area of a sodium sulfate decahydrate mining area near a four-effect vacuum evaporation brine production shop, enabling the well depth to reach a bottom plate of a sodium sulfate decahydrate layer, and drilling two horizontal wells (2, 3) with smaller vertical well depth in the horizontal direction to be communicated with the vertical well; B, cavity dissolving, injecting fresh water with certain temperature from the first horizontal well (2), flowing through the second horizontal well (3), and enabling the brine to flow out of the vertical well (1); C, cavity re-dissolving, after the cavity dissolving is completed, injecting fresh water with certain temperature from the second horizontal well (3), flowing through the first horizontal well (2), and circulating for a period of time repeatedly; D, production, after the cavity re-dissolving is finished, turning to the normal production. The method has the advantage that the three wells are arranged in a triangle way, so the mining area is expanded, the utilization rate of deposits and the concentration of the brine are improved, and the production cost of the brine is reduced.

Description

technical field [0001] The invention relates to a mining method of thenardite ore, in particular to a method for mining underground thenardite ore by drilling and hot water solution. Background technique [0002] In the mining methods of all kinds of non-metallic inorganic salt thenardite mines, for open-pit or covered thin or deep glauberite mines, anhydrous thenardite mines and salt deposits, mechanical manual mining of solid mines after stripping and covering or drilling Water-soluble mining has been reported in China, especially the drilling water-soluble mining of underground anhydrous thenardite mines has patents and successful production companies. However, for the decashui Glauberite ore buried at about 300 meters without roof and floor rock formations, the patent numbers "03124778.4", "200710004894.1", "200610008019.6", and "99114212.8" all adopt water-soluble mining of underground Glauberite ore, but the drilling method is adopted. The disadvantage of the water-so...

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Problems solved by technology

However, for the decashui Glauberite ore buried at about 300 meters without roof and floor rock formations, the patent numbers "03124778.4", "200710004894.1", "200610008019.6", and "99114212.8" all adopt water-soluble mining of underground Glauberite ore, but the drilling method is adopted. The disadvantage of the water-soluble mining of the opposite well, that is, the water-soluble mining of the second well, is that the production capacity of the opposite well is low, and the brine concentration is high, and the mining cost is high

It is difficult and limited to adopt the water-soluble mining method of the second-well Unicom drilling to realize industrialized large-scale production, resulting in low mining rate, low brine concentration, and high cost. Comprehensive factors

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