Potassium sulfate preparing process from sulfate-type salt lake bittern

A kind of salt lake brine and sulfate-type technology, which is applied in the direction of alkali metal sulfite/sulfite, bisulfite preparation, chemical instruments and methods, etc., can solve the problems of being in the test and not realizing industrialization, etc., and achieve cost Low, improve potassium recovery rate and grade, and easy operation

Inactive Publication Date: 2006-05-10
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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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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  • Potassium sulfate preparing process from sulfate-type salt lake bittern
  • Potassium sulfate preparing process from sulfate-type salt lake bittern

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Embodiment Construction

[0023] Below in conjunction with Fig. 1 and the example of a certain salt lake in Qinghai, the invention is further described in detail.

[0024] The brine of a salt lake in Qinghai (the brine components are: K0.7-1.3%, Mg0.9-2%, Cl12-18%, SO41.0-3.0%), in the salt field, the salt is concentrated and evaporated by the sun, and evaporated The process is carried out in stages in order to obtain salt mines with different compositions, and to separate the required sulfate ores and potassium mixed salt ores. According to the composition of these two ores, the ore blending is calculated. Take 300kg of potassium mixed salt ore, 500kg of sulfur mixed salt ore, and calculate the water volume of 300kg. After finishing, with the feeding speed of 6-12L / min (in terms of ore pulp), the slurry enters the 80L stirring tank, and then adds 250ml / T by C 4 -C 16 Fatty acid flotation agent and C 4 -C 16 The mixed flotation agents composed of polyol flotation aids are mixed evenly and enter the...

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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:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/00C01D5/12C01D3/06B03D1/00B03D1/004
Inventor 李海民程怀德张全有孟瑞英
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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