Process for preparing potassium chloride by using carnallite containing calcium sulfate

A carnallite, calcium sulfate technology, applied in the direction of alkali metal chloride, etc., can solve the problem of not producing potassium chloride, etc., and achieve the effects of easy filtration, simple production process and coarse particle size

Inactive Publication Date: 2012-12-12
BLUESTAR LEHIGH ENG INST CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

For CaSO in carnallite raw material 4 When the content of potassium chloride is more than 2%, high-quality potassium chloride products cannot be produced by this process

Method used

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  • Process for preparing potassium chloride by using carnallite containing calcium sulfate

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Effect test

Embodiment 1

[0025] Embodiment 1, with reference to figure 1 , a kind of technique that utilizes calcium sulfate-containing carnallite ore to produce Potassium Chloride, its steps are as follows:

[0026] (1) The water-mined or dry-mined carnallite containing calcium sulfate mined in the salt field is firstly mixed with old brine, and a collector for flotation calcium sulfate is added during the slurry adjustment, and the material after the slurry adjustment is floated for the first time Selecting and collecting calcium sulfate;

[0027] (2) After the calcium sulfate is selected, the slurry is added to the collector for flotation of sodium chloride, and the sodium chloride is reverse flotation for the second time;

[0028] (3) Dehalogenate the product in the tank after selecting sodium chloride. After dehalogenation, the solid phase is decomposed by adding water. After decomposing, the solid phase is concentrated, filtered, washed, centrifugally dehydrated, and finally dried to obtain the...

Embodiment 2

[0029] Example 2, in the step (3) of the process for producing potassium chloride by utilizing calcium sulfate-containing carnallite ore described in Example 1: the liquid phase after dehalogenation returns to calcium sulfate flotation in step (1) The previous pulping operation is recycled; the liquid phase generated by filtration and centrifugal dehydration is returned to the decomposition operation for recycling.

Embodiment 3

[0030] Example 3, in the step (1) of the process for producing potassium chloride from carnallite ore containing calcium sulfate described in Example 1: the mass content of calcium sulfate in water mining or dry mining carnallite is not less than 2% .

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Abstract

The invention provides a process for preparing potassium chloride by using carnallite containing calcium sulfate. The process comprises the following steps: applying old brine in slurry mixing of calcium sulfate-containing carnallite extracted in a salt pan by using a hydraulic mining or dry mining method, adding a collecting agent used for flotation of calcium sulfate during slurry mixing and carrying out primary reverse flotation on a material obtained after slurry mixing so as to collect calcium sulfate; then adding a collecting agent used for flotation of sodium chloride into the slurry which has undergone flotation of calcium sulfate and carrying out secondary reverse flotation to collect sodium chloride; and carrying out dehalogenation on a product in a tank obtained after flotation of sodium chloride, adding water to decompose a solid phase after dehalogenation and subjecting the decomposed solid phase to condensation, filtration, washing, centrifuge dewatering and drying so as to obtain the potassium chloride product. The production process provided by the invention is simple, is convenient to operate and has strong adaptability to the raw material carnallite; the potassium chloride product prepared by using the process in the invention has the advantages of good quality, coarse granularity, uneasy caking and convenient usage.

Description

technical field [0001] The invention relates to a process for preparing potassium chloride, in particular to a process for preparing potassium chloride from carnallite ore containing calcium sulfate. Background technique [0002] The methods for preparing potassium chloride from carnallite ore are generally divided into forward flotation method and reverse flotation-cold crystallization method. These two processes are relatively mature in technology, but the content of calcium sulfate in the raw material carnallite ore used is subject to certain restrictions. For the positive flotation process, the content of calcium sulfate in the raw material carnallite ore must be less than 3%, otherwise the final Potassium chloride product quality does not meet the national standard requirements. [0003] Chaerhan Salt Lake is the main potash fertilizer production base in my country. The current process adopted by Salt Lake Group, the largest potassium chloride production enterprise in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 张红茹刘升林曹效权刘星强
Owner BLUESTAR LEHIGH ENG INST CO LTD
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