Method for extraction of deep-seated intercrystalline bittern of salt lake mining area

Abstract

The invention relates to a method for extraction of deep-seated intercrystalline bittern of a salt lake mining area. The method comprises the following steps of 1, excavating a gas-injection well, brine mining wells and a brine transportation channel on a salt lake ore bed, arranging an air compressor on the salt lake ore bed, arranging a brine tail liquid injection pipe in the gas-injection well around which the brine mining wells each provided with a brine transportation pipe in the interior are uniformly arranged; and arranging a brine mining pump in each one of the brine mining wells, wherein the brine mining pump is connected to one end of the brine transportation pipe of which the other end is connected to the brine transportation channel, 2, continuously pumping compressed air into the salt lake ore bed by the air compressor so that deep-seated intercrystalline bittern gushes out, 3, pumping out the deep-seated intercrystalline bittern from underground by the brine mining pumps and outputting the deep-seated intercrystalline bittern to the brine transportation channel, 4, injecting a brine tail liquid subjected to potassium extraction into the salt lake ore bed in the gas-injection well so that the brine tail liquid reaches a salt bed and forms novel potassium-containing brine, and 5, repeating the steps of 2-4 so that a cycle is finished. The method utilizes compressed air to realize extrusion of intercrystalline bittern and deep-seated bittern so that resources are fully utilized.

Description

technical field [0001] The invention relates to a method for extracting salt lake brine, in particular to a method for extracting deep intercrystalline brine in a salt lake mining area. Background technique [0002] 75% of the world's potassium reserves are in Canada and Russia. At present, the production of potassium chloride in China is concentrated in the salt lake of Qaidam Basin. The salt lakes in the Qaidam Basin have large total potassium reserves (up to 1 billion tons), low basic reserves (245 million tons, accounting for 23.4%), even less designed recoverable reserves (116 million tons, accounting for only 11.1%), and low Grade solid potassium resources account for a large proportion (340 million tons). At the same time, with the vigorous development of potassium resources, the blind and excessive exploitation has led to serious overexploitation of intercrystalline and pore latent brine in Chaerhan Salt Lake, as well as intercrystalline and pore pressurized brine,...

AI Technical Summary

Problems solved by technology

At the same time, with the vigorous development of potassium resources, the blind and excessive exploitation has led to serious overexploitation of intercrystalline and pore latent brine in Chaerhan Salt Lake, as well as intercrystalline and pore pressurized brine, resulting in a significant drop in the brine water level in the mining area, forming a large area of ​​dredging. In the dry area, the high-grade solid potassium resources are further depleted, and a large amount of solid potassium chloride cannot be dissolved and extracted

[0003] The existing brine extraction mainly includes canal mining and well mining. If factors such as recharge and solid-liquid conversion are not considered, at most the brine that flows out of the pores under the action of gravity can only be extracted.

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