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Potassium sulfate preparing process from sulfate-type salt lake bittern

A salt lake brine, sulfate type technology, applied in the directions of alkali metal sulfite/sulfite, bisulfite preparation, chemical instruments and methods, etc. The effect of recovery rate and grade, low cost and easy operation

Inactive Publication Date: 2004-11-24
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] A certain salt lake brine in Qinghai (brine composition: K 0.7-1.3%, Mg 0.9-2%, Cl 12-18%, SO41.0-3.0%), in the salt field, it is evaporated by the sun to concentrate and precipitate salt. It 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 flotation mac...

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Abstract

The present invention is one method of preparing potassium sulfate with sulfate type lake bittern resource. The preparation process includes the following steps: shining bittern to obtain mixed sulfate mineral with sodium chloride, schoenite, magnesium sulfate and potassium chloride as main components and mixed potassium salt mineral with sodium chloride, potassium chloride, magnesium sulfate and carnallite as main components; mixing these two kinds of mineral and converting with water at normal temperature to obtain coarse mixed schoenite mineral; floating the mixed schoenite mineral to obtain concentrated mixed schoenite mineral; adding water to the high-grade concentrated mixed schoenite mineral and decomposing directly to obtain potassium sulfate product; water washing the tailing to obtain industrial salt. The technological process is power saving and low in cost, and has other advantages.

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 Applications(China)
IPC IPC(8): B03D1/00B03D1/004C01D3/06C01D5/00C01D5/12
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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