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Method for obtaining potassium chloride from low-grade potassium-containing sulphate salt lake ores

A sulfate-type, low-grade technology, applied in the field of obtaining potassium chloride, can solve the problems of high capital construction cost, large impact on the natural environment, difficult management, etc., and achieve the effects of improving resource utilization and simple process

Active Publication Date: 2014-11-05
青海省茫崖兴元钾肥有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the only way to increase production is to increase the drying area of ​​salt fields. The cost of infrastructure is high, the area is large, and it is difficult to manage. It is greatly affected by the natural environment. Changes in natural conditions such as floods, rainfall, and strong winds have a greater impact on production.

Method used

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  • Method for obtaining potassium chloride from low-grade potassium-containing sulphate salt lake ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 The method for obtaining potassium chloride from the sulfate subtype salt lake ore containing low-grade potassium may further comprise the steps:

[0020] (1) Deploy the existing summer brine from Dalangtan Mangya Xingyuan Potash Fertilizer Co., Ltd. after potassium extraction with fresh water to form a solvent for dissolving low-grade potassium-containing sulfate-type salt lake solid ore, so that the weight of potassium ions in the solvent The percentage content is 0.62%, the sodium ion weight percentage content is 4.0%, the magnesium ion weight percentage content is 2.82%, the chloride ion weight percentage content is 11.05%, and the sulfate root weight percentage content is 5.0%.

[0021] ⑵Use a solvent to dissolve the sulfate-type salt lake solid ore containing low-grade potassium, and use the heat conducted from the heat pump to fully dissolve it at a temperature of 40°C. After 90 minutes, the weight percentage of potassium ions obtained by separatio...

Embodiment 2

[0025] Example 2 The method for obtaining potassium chloride from the sulfate subtype salt lake ore containing low-grade potassium may further comprise the steps:

[0026] ⑴The existing winter brine from Dalangtan Mangya Xingyuan Potash Fertilizer Co., Ltd. after potassium extraction is prepared with fresh water to form a solvent for dissolving sulfate-type salt lake solid ore containing low-grade potassium, so that the weight of potassium ions in the solvent The percentage content is 0.35%, the weight percentage content of sodium ions is 2.05%, the weight percentage content of magnesium ions is 2.56%, the chloride ion weight percentage content is 8.47%, and the sulfate root weight percentage content is 3.50%.

[0027] ⑵Use a solvent to dissolve the sulfate-type salt lake solid ore containing low-grade potassium, and use the heat conducted from the heat pump to fully dissolve it at a temperature of 50°C. After 30 minutes, the weight percentage of potassium ions obtained b...

Embodiment 3

[0031] Example 3 The method for obtaining potassium chloride from the sulfate subtype salt lake ore containing low-grade potassium may further comprise the steps:

[0032] ⑴The existing winter brine from Dalangtan Mangya Xingyuan Potash Fertilizer Co., Ltd. after potassium extraction is prepared with fresh water to form a solvent for dissolving sulfate-type salt lake solid ore containing low-grade potassium, so that the weight of potassium ions in the solvent The percentage content is 0.3%, the weight percentage content of sodium ions is 1.0%, the weight percentage content of magnesium ions is 2.0%, the chloride ion weight percentage content is 8.0%, and the sulfate root weight percentage content is 3.0%.

[0033] ⑵Use a solvent to dissolve the sulfate-type salt lake solid ore containing low-grade potassium, and use the heat conducted from the heat pump to fully dissolve it at a temperature of 45°C. After 60 minutes, the weight percentage of potassium ions obtained by sep...

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Abstract

The invention relates to a method for obtaining potassium chloride from low-grade potassium-containing sulphate salt lake ores. The method comprises the following steps: (1) mixing fresh water for old brine after potassium extraction, and thus forming a solvent for dissolving low-grade potassium-containing sulphate salt lake solid ores; (2) utilizing the solvent to dissolve the low-grade potassium-containing sulphate salt lake solid ores, completely dissolving the low-grade potassium-containing sulphate salt lake solid ores through adopting heat which is transferred from a heat pump, and thus obtaining five-system brine with sodium and magnesium; (3) cooling the five-system brine to room temperature, and then conducting freeze crystallization and filter separation so as to respectively obtain potassium chloride-rich brine with the weight percents of sodium sulfate decahydrate, magnesium sulfate heptahydrate and sulfate radical being less than 2%; and (4) sequentially carrying out evaporation for sodium removal, ore dressing, flotation, concentration, filtration, washing, drying on the potassium chloride-rich brine which is obtained in step (3) according to a common potassium separation and extraction method, and packing to obtain potassium chloride. The method has a high resource utilization rate and no waste liquid discharge.

Description

technical field [0001] The invention relates to a method for producing potassium chloride, in particular to a method for obtaining potassium chloride from a low-grade potassium-containing sulfate subtype salt lake ore. Background technique [0002] Chaerhan Salt Lake is the largest chloride-type salt lake in my country, basically Na + , Mg 2+ , K + / / Cl - —H 2 O system, it is relatively simple to obtain potassium chloride from this quaternary system, and the process is relatively mature. With the current process, more than 10 tons of old brine will be produced by-product for every 1 ton of potassium chloride produced. There are two kinds of processes for producing potassium chloride at home and abroad: (1) The route of removing magnesium chloride first - making the magnesium chloride in carnallite decompose and dissolve in the liquid phase first, and then separating the precipitated potassium chloride and sodium chloride to produce potassium chloride. The route includ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/06
CPCY02P20/129
Inventor 纪律陈高琪贾永忠张超崔振华吕颖郑宁
Owner 青海省茫崖兴元钾肥有限责任公司