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A method for preparing food-grade potassium chloride from decalcification of high-calcium waste ore

A potassium chloride, food-grade technology, applied in the field of decalcification to produce food-grade potassium chloride, can solve the problems that potassium chloride products cannot reach the lowest level and affect the quality of potassium chloride products, and achieve the purpose of improving equipment production capacity, The effect of low production cost and reduced natural cooling time

Inactive Publication Date: 2016-04-27
格尔木康生钾业科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When local enterprises adopt the conventional flotation method to produce potassium chloride, a large amount of calcium sulfate will be enriched in the potassium chloride product, seriously affecting the quality of the potassium chloride product, making the potassium chloride product unable to meet the lowest grade in the national standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 A kind of method that decalcification produces food-grade potassium chloride from high-calcium waste ore, comprises the following steps:

[0021] ⑴ Stir high-calcium carnallite waste ore raw materials with a calcium ion content of 0.5%~1% together with fresh water and a saturated solution of potassium chloride at room temperature at room temperature for decomposition reaction, filter after 10 minutes, and obtain decomposition mother liquor and magnesium element respectively High-calcium-potassium rock salt with a content not higher than 2%.

[0022] Among them: the ratio of high-calcium carnallite waste ore raw material to fresh water is 1kg: 0.2L; the ratio of fresh water to normal temperature potassium chloride saturated solution is 5L: 1L.

[0023] (2) After mixing the high-calcium potassium rock salt and the saturated solution of potassium chloride at room temperature in a ratio of 1kg:1L, heat and dissolve at a temperature of 80°C to obtain a high-pota...

Embodiment 2

[0027] Embodiment 2 A method for decalcifying food-grade potassium chloride from high-calcium waste ore, comprising the following steps:

[0028] ⑴ Stir the high-calcium carnallite waste ore raw material with a calcium ion content of 1% to 2% together with fresh water and a saturated solution of potassium chloride at room temperature for decomposition reaction at room temperature, filter after 120 minutes, and obtain the decomposition mother liquor and magnesium element respectively High-calcium-potassium rock salt with a content not higher than 2%.

[0029] Among them: the ratio of high-calcium carnallite waste ore raw material to fresh water is 1kg: 0.5L; the ratio of fresh water to normal temperature potassium chloride saturated solution is 100L: 1L.

[0030] (2) After mixing the high-calcium potassium rock salt and the saturated solution of potassium chloride at room temperature in the ratio of 1kg:50L, heat and dissolve at a temperature of 100°C to obtain a high-potassium...

Embodiment 3

[0034] Embodiment 3 A method for decalcifying food-grade potassium chloride from high-calcium waste ore, comprising the following steps:

[0035] ⑴ Stir the high-calcium carnallite waste ore raw material with a calcium ion content of 2% to 3% together with fresh water and a saturated solution of potassium chloride at room temperature for decomposition reaction at room temperature, filter after 65 minutes, and obtain the decomposition mother liquor and magnesium element respectively High-calcium-potassium rock salt with a content not higher than 2%.

[0036] Among them: the ratio of high-calcium carnallite waste ore raw material to fresh water is 1kg: 0.35L; the ratio of fresh water to normal temperature potassium chloride saturated solution is 55L: 1L.

[0037] (2) After mixing the high-calcium potassium rock salt and the normal temperature potassium chloride saturated solution at a ratio of 1kg:25L, heat and dissolve at a temperature of 890°C to obtain a high-potassium soluti...

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Abstract

The invention relates to a method for preparing food-grade potassium chloride by removing calcium from high-calcium waste ore. The method comprises the following steps: (1) stirring high-calcium waste carnallite which serves as a raw material together with fresh water and normal-temperature saturated liquid of potassium chloride at room temperature to carry out decomposition reaction, and filtering to obtain a mother liquor from decomposition and high-calcium sylvite; (2) mixing the high-calcium sylvite with the normal-temperature saturated liquid of potassium chloride, heating to melt to obtain the slurry of high-potassium liquid, and filtering the slurry of high-potassium liquid to obtain high-potassium liquid and high-calcium residue; (3) feeding the high-potassium liquid into a crystallizer, stirring to cool naturally and crystallize, adding fresh water intermittently, and decreasing the system temperature to 5-25 DEG C to obtain a slurry; and (4) filtering the slurry to obtain a cold mother liquor from crystallization of potassium chloride and wet potassium chloride; and (5) washing the wet potassium chloride, drying, and packaging to obtain the large-particle food-grade potassium chloride with the purity of more than 99.5%. The method provided by the invention is easy to operate and is low in cost, and the prepared potassium chloride has high quality.

Description

technical field [0001] The invention relates to the field of potassium chloride production, in particular to a method for preparing food-grade potassium chloride from high-calcium waste ore by decalcification. Background technique [0002] Potassium chloride is a substitute for suppressing people's excessive intake of salt, and it is a low-sodium salt that has been emerging and popularized in recent years. With the development of medicine, medical authorities have realized that excessive intake of sodium can easily cause some patients to retain body fluids, resulting in heart congestion and high blood pressure. In 1982, Anborsionl found that high potassium can counteract the hypertensive effect caused by sodium. In 1980, the American Council of Food Science and Nutrition recommended that adults consume 1875-5652 mg of potassium per day. At present, the sales of substitutes for edible salt are increasing day by day abroad, and various low-sodium and high-potassium seasoning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/14
Inventor 李华生吴小王黄培锦
Owner 格尔木康生钾业科技发展有限公司
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