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Method for preparing potassium chloride with inferior carnallite

A carnallite and potassium chloride technology, applied in the direction of alkali metal chloride and the like, can solve the problems such as the inability to produce KCl products, and achieve the effects of improving the utilization rate, high removal rate and simple process

Inactive Publication Date: 2011-09-07
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to CaSO 4 Increased content, especially for CaSO 4 The content reaches 1-15% carnallite. Under the existing conditions, qualified KCl products cannot be produced

Method used

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  • Method for preparing potassium chloride with inferior carnallite
  • Method for preparing potassium chloride with inferior carnallite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. A kind of method producing potassium chloride with inferior carnallite, its step is:

[0015] (1) Taking the carnallite mineral containing 15% calcium sulfate in the salt field as raw material, using saturated brine of potassium, sodium, magnesium and chlorine or old brine to adjust the slurry to a concentration of 15% by weight;

[0016] (2) The material after pulping is removed by the reverse flotation process to remove impurity calcium sulfate. The reverse flotation operation time is 3 minutes at the natural temperature of the environment. The reverse flotation process is one roughing, one selection, one sweeping, A proper amount of calcium sulfate collector is added during roughing and sweeping to obtain refined low-calcium carnallite minerals;

[0017] (3) Carry out cold decomposition-positive flotation process after dehalogenating the refined low-calcium carnallite mineral, and recycle the mother liquor after dehalogenation; add an appropriate amount o...

Embodiment 2

[0018] Example 2. A kind of method producing potassium chloride with inferior carnallite, its step is:

[0019] (1) Taking the carnallite mineral containing 10% calcium sulfate in salt field as raw material, using saturated brine of potassium, sodium, magnesium and chlorine or old brine to adjust the slurry to a concentration of 45% by weight;

[0020] (2) The material after pulping is removed by the reverse flotation process to remove impurity calcium sulfate. The reverse flotation operation time is 45 minutes at the natural temperature of the environment. The reverse flotation process is one roughing, one selection, one sweeping, A proper amount of calcium sulfate collector is added during roughing and sweeping to obtain refined low-calcium carnallite minerals;

[0021] (3) Carry out cold decomposition-positive flotation process after dehalogenating the refined low-calcium carnallite mineral, and recycle the mother liquor after dehalogenation; add an appropriate amount of w...

Embodiment 3

[0022] Example 3. A kind of method producing potassium chloride with inferior carnallite, its step is:

[0023] (1) Take the carnallite mineral containing 5% of calcium sulfate in the salt field as raw material, and use saturated brine of potassium, sodium, magnesium and chlorine or old brine to adjust the slurry to a concentration of 25% by weight;

[0024] (2) The material after pulping is removed by the reverse flotation process to remove impurity calcium sulfate. The reverse flotation operation time is 25 minutes at the natural temperature of the environment. The reverse flotation process is one roughing, one selection, one sweeping, A proper amount of calcium sulfate collector is added during roughing and sweeping to obtain refined low-calcium carnallite minerals;

[0025] (3) Carry out cold decomposition-positive flotation process after dehalogenating the refined low-calcium carnallite mineral, and recycle the mother liquor after dehalogenation; add an appropriate amoun...

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Abstract

The invention relates to a method for preparing potassium chloride with inferior carnallite, which is characterized in that: carnallite mineral with less than 15 percent of calcium sulphate in salina is taken as raw material, saturated bittern or master sauce is used for size mixing; the impurities-calcium sulphate in the material after being mixed are removed by adopting a reverse floatation process, and the reverse floatation process flows include first rough concentration, first re-concentration and first scavenging, when in rough concentration and scavenging, an amount of calcium sulphatecollecting agents are added, so as to prepare refined low-calcium carnallite mineral; after the refined low-calcium carnallite mineral carries out dehalogenation, and then cold decomposition-direct floatation process is carried out; in the direct floatation process flow, calcium sulphate inhibitors are added, and then the direct floatation process flows include first direct floatation process flow, first scavenging and secondary re-concentration, and finally, concentrate washing operation is carried out, so as to obtain potassium chloride product; mother solution is returned to a cold decomposition-direct floatation inner system after the concentrate and the tailings are filtered in the direct floatation process; in the factory condition, inferior carnallite is used for preparing the potassium chloride product, the technological process is simple, the calcium sulphate impurity removal percentage is high and the potassium chloride quality can reach national standard.

Description

technical field [0001] The invention relates to a method for preparing potassium chloride, in particular to a method for preparing potassium chloride with inferior carnallite. Background technique [0002] Chaerhan Salt Lake in Qinghai Province is the main potash fertilizer production base in my country, with a production history of more than 40 years. With the extension of mining life and the reuse of tail brine, the Ca in brine ++ The ions are gradually enriched, making the CaSO 4 content is increasing. Due to CaSO 4 Increased content, especially for CaSO 4 The content reaches 1-15% carnallite, and under the existing conditions, no qualified KCl product can be produced. [0003] In the prior art, the method for producing potassium chloride from inferior carnallite (high calcium sulfate content) has: [0004] 1. The method of direct flotation processing: This method is the direct cold decomposition of inferior carnallite-positive flotation to produce potassium chlorid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/08
Inventor 宋文义
Owner BLUESTAR LEHIGH ENG INST CO LTD