Potassium sulfate preparing process from sulfate-type salt lake bittern

Abstract

The invention provides a method for producing potassium sulfate by using sulfate-type salt lake brine resources. The method comprises the following steps: drying the sulfate-type salt lake brine in a salt field to obtain sodium chloride, soft potassium and magnesium Sulfate mixed salt ore of vanadium, magnesium sulfate and potassium chloride and potassium salt mixed salt ore mainly containing sodium chloride, potassium chloride, magnesium sulfate and carnallite; after mixing these two kinds of ores, they are mixed with The water is converted to produce coarse langbeinite mixed ore. The mixed ore is selected through the flotation process to select the langbeinite mixed salt concentrate, and then add water to the high-grade langbeinite mixed salt concentrate to decompose directly. Potassium sulfate product can be obtained; its tailings can be used as industrial salt after being washed with water; compared with the existing similar process, the present invention removes the grinding process with large power consumption, and the whole process does not add potassium chloride, saving Energy saving, cost reduction, simple process, normal temperature and pressure operation, strong adaptability to different grades of raw material ores, and good product purity and whiteness.

Description

technical field [0001] The invention relates to a method for preparing potassium sulfate from sulfate type salt lake brine. Background technique [0002] Sulfate-type salt lake brine is a brine resource that mainly contains inorganic salt-forming elements such as sodium, potassium, magnesium, chlorine, and sulfate. After the sulfate-type salt lake brine is dried on the salt field beach, the sulfate mixed salt mine mainly containing sodium chloride, soft potassium magnesium vanadium, magnesium sulfate and potassium chloride and the sulfate mixed salt mine mainly containing sodium chloride, potassium chloride and magnesium sulfate can be obtained. , Carnallite potash mixed salt ore. [0003] Potassium is one of the three major elements of crop growth. The average ratio of nitrogen, phosphorus, and potassium fertilization in agricultural production in the world is 1:0.42:0.30, while the current ratio of nitrogen, phosphorus, and potassium fertilization in my country is 1:0.38:...

AI Technical Summary

Problems solved by technology

The extraction of potassium sulfate from salt lake brine is a development direction of my country's potassium sulfate industry. It is characterized by a wide range of raw materials, low prices, and the production process is good for the environment without environmental pollution. At present, potassium sulfate is produced from sulfate-type salt lake brine. There are many methods, but most of them are in the experiment and have not realized industrialization

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