Segmented ore-forming process of magnesium sulfate subtype salt lake brine through natural evaporation of salt pan

Abstract

The invention relates to a segmented ore-forming process of magnesium sulfate subtype salt lake brine through the natural evaporation of a salt pan. The process comprises the following steps: (1) introducing magnesium sulfate subtype brine exploited from a salt lake well into a sodium salt pond with a pump, naturally evaporating for dissolving out sodium chloride, introducing into a regulating tank when epsomite is close to saturation, and introducing into a potassium-mixed salt pond when a brine point reaches a condition that the epsomite is close to saturation and about to dissolve out; (2) continuing to naturally evaporate the brine obtained in step (1) in the potassium-mixed salt pond, introducing the brine into a carnallite pond when carnallite is close to saturation and about to dissolve out, dissolving out a potassium-mixed salt mine, and enabling the potassium-mixed salt mine to enter a potassium magnesium sulphate fertilizer workshop to produce a schoenite product; (3) continuing to naturally evaporate the brine obtained in step (2) in the carnallite pond, introducing into an old brine storage tank when the brine reaches an old brine point, dissolving out a carnallite mine, and enabling the carnallite mine to enter a potassium chloride workshop to produce a potassium chloride product. The invention has the advantages that the process is simple, the production cost is low, and sulfur-potassium ratio of the potassium-mixed salt mine is high.

Description

technical field [0001] The invention relates to the field of inorganic salt chemical industry, in particular to a staged mineralization process of natural evaporation of magnesium sulfate subtype salt lake brine and salt fields. Background technique [0002] According to the chemical composition of salt lake brine, salt lakes can be divided into three types: carbonate, sulfate and chloride. The most common distribution in China is the sulfate-type salt lake, and the number is also the largest. China's sulfate-type salt lake resources are mainly concentrated in Qinghai and Xinjiang, among which sulfate-type magnesium subtype salt lake resources are the main resources. Although the number is small, the area of ​​salt lakes accounts for 1 / 2 of the total area, and the resource reserves are large. An important brine raw material for the production of potassium sulfate. [0003] The technical process of producing potassium sulfate by using sulfate-type salt lake brine is as foll...

AI Technical Summary

Problems solved by technology

This process can meet the requirements of magnesium sulfate subtype brine to produce potassium sulfate, but there is a problem of low efficiency

Due to the setting up of the Epsilon Salt Field in the drying and evaporation process of the salt field, the precipitation of the Epoxy Salt resulted in a decrease in the sulfate content in the brine, and the insufficient sulfur-potassium ratio in the sun-dried potash mixed salt ore had a great impact on the production of langbeinite ; In order to replenish the sulfate radical, the epsom salt that precipitates has to be added into the soft potash conversion section in the conversion process, resulting in increased production costs, which is economically unreasonable

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