Exploitation method for deep pore brine and low-grade solid potassium deposit

Abstract

The invention relates to the technical field of salt chemical industry, and specifically relates to an exploitation method for deep pore brine and low-grade solid potassium deposit. The exploitation method comprises the following steps of (1) brine transportation preparation; (2) solvent injection; (3) exploitation of pressurized brine; (4) brine collection; (5) potassium extraction; and (6) repetition of the steps (2)-(5), and exploitation of the deep pore brine and the low-grade solid potassium deposit circularly. The exploitation method can fully dissolve the low-grade solid potassium deposit, and realize maximum exploitation of the pore brine, the low-grade solid potassium deposit and deep pressurized brine at the same time while guaranteeing that a stratum structure is not destroyed. An implementation process of the exploitation method is simple, practicable and safe. Meanwhile, the exploitation method can realize maximum exploitation of the deep pore brine and the low-grade solid potassium deposit by driving flow of the pore brine in a salt bed by using two flow directions in horizontal and vertical directions of the solvent in the deposit.

Description

technical field [0001] The invention relates to the technical field of salt chemical industry, in particular to a method for mining deep pore brine and low-grade solid potassium ore. Background technique [0002] At present, China's potassium resource reserves are mainly concentrated in the salt lake area of ​​the Qaidam Basin in Qinghai. The total potassium reserves in this area are large (1 billion tons), the basic reserves are small (245 million tons, accounting for 23.4%), and the designed recoverable reserves are even less ( 116 million tons, accounting for only 11.1%), of which a large amount of potassium resources are low-grade solid potassium ores that are difficult to exploit directly (340 million tons, accounting for about 29.5%); in addition, with the vigorous development of potassium resources, blind and excessive exploitation , leading to severe overexploitation of intercrystalline and pore brine in Chaerhan Salt Lake, as well as intercrystalline and pore pressu...

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Problems solved by technology

[0005] Although the method in the above-mentioned patent can realize the extraction of deep-layer brine, it needs to introduce high-pressure air to realize the pressure-driven intergranular brine. In addition, the brine tail liquid injected into the brine pipeline flows too fast under the drive of air pressure, resulting in the inability to fully dissolve and exploit intergranular brine and low-grade potassium ore

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