System and processing of the preparation of potassium chloride in lare grains by cold decomposition crystallization of high sodium potassium salt ore and flotation method

A technology of cold decomposition and potassium chloride, applied in the direction of alkali metal chloride, etc., to achieve the effect of improving market competitiveness, reducing equipment operating costs, and having broad market prospects

Active Publication Date: 2013-08-28
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] 2. The method for extracting potassium chloride from the mixed ore of potassium halite and carnallite (CN1259486). This invention crushes the mixed ore of potassium halite and carnallite collected in the salt field, then adds saturated brine to grind the ore, and then Carry out flotation, obtain potassium chloride solid through filtering, drying, and the k

Method used

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  • System and processing of the preparation of potassium chloride in lare grains by cold decomposition crystallization of high sodium potassium salt ore and flotation method
  • System and processing of the preparation of potassium chloride in lare grains by cold decomposition crystallization of high sodium potassium salt ore and flotation method
  • System and processing of the preparation of potassium chloride in lare grains by cold decomposition crystallization of high sodium potassium salt ore and flotation method

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Effect test

Embodiment 1

[0032] A kind of technology of cold decomposition crystallization and flotation method of high-sodium potassium salt ore to prepare large particle potassium chloride, concrete steps are as follows:

[0033] (1) The high-sodium potassium salt ore with a mass percentage of sodium chloride of 29.84% is sieved through a standard sieve with a sieve diameter of 4 mm, and the under-sieve is used as feed and continuously fed into the cold decomposition crystallizer by a continuous screw feeding system. The feeding rate of high-sodium potassium salt ore is 2.38kg / h, and the MgCl in the circulating liquid 2 The mass percent concentration is 23%, the residence time of the crystallizer is 3.55 hours, the operating temperature is 25°C, the stirring speed of the propulsion type stirring paddle is 400rpm, and the large particle potassium chloride product is obtained in the crystallizer.

[0034] (2) The potassium chloride fine crystal product obtained at the top of the crystallizer in step (...

Embodiment 2

[0039] A kind of technology of cold decomposition crystallization and flotation method of high-sodium potassium salt ore to prepare large particle potassium chloride, concrete steps are as follows:

[0040] (1) The high-sodium potassium salt ore with a mass percentage of sodium chloride of 42.50% is sieved through a standard sieve with a sieve diameter of 6mm, and the undersieve is used as feed and continuously fed into the cold decomposition crystallizer by a continuous screw feeding system. The feeding rate of sodium potassium salt ore is 3.95kg / h, and the MgCl in the circulating liquid 2 The mass percentage concentration is 25%, the residence time of the crystallizer is 2.26 hours, the operating temperature is 27°C, the stirring speed of the straight stirring paddle is 600rpm, and the large particle potassium chloride product is obtained in the crystallizer.

[0041] (2) The potassium chloride fine crystal product obtained at the top of the crystallizer in step (1) enters t...

Embodiment 3

[0046] A kind of technology of cold decomposition crystallization and flotation method of high-sodium potassium salt ore to prepare large particle potassium chloride, concrete steps are as follows:

[0047] (1) The high-sodium potassium salt ore with a mass percentage of sodium chloride of 39.06% is sieved through a standard sieve with a sieve diameter of 8mm, and the undersieve is used as feed and continuously fed into the cold decomposition crystallizer by a continuous screw feeding system. The feeding rate of high-sodium potassium salt ore is 2.66kg / h, and the MgCl in the circulating liquid 2 The mass percent concentration is 24%, the residence time of the crystallizer is 3.50 hours, the operating temperature is 35°C, the stirring speed of the propulsion type stirring paddle is 400rpm, and the large particle potassium chloride product is obtained in the crystallizer.

[0048] (2) The potassium chloride fine crystal product obtained at the top of the crystallizer in step (1)...

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Abstract

The present invention relates to a system of preparing large granular potassium chloride through cold decomposition crystallization technology controlling and flotation separation of high sodium potash mine, namely, a method to obtain large granular potassium chloride through cold decomposition crystallization technology controlling and flotation separation taking high sodium potash mine as raw material, and puts forward the crystallizer structure and the operating parameters to realize granularity control of potassium chloride products based on the obtained processing parameters. The present invention aims at using high sodium potash mine to produce potassium chloride, in which mass percentage of sodium chloride is between 30% and 60%, realizing granularity control of potassium chloride crystal products in the process of producing potassium chloride by taking high sodium potassium salt ore as raw material; and the average granularity of the obtained potassium chloride is between 0.15mm and 0.35mm; which has great significance in further optimizing the equipment selection of mine plant engineering, improving reliability and stability of equipment operation and reducing the operating costs of equipment; which can also save the operating costs in the process of centrifugal separation and drying process during the production and reduce the comprehensive cost of the products. The present invention improves market competitiveness of producing potassium chloride products by taking high sodium potash mine as raw material, and has significant economic efficiency and broad market prospects.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a process for controlling the grain size of product crystals in the potash fertilizer production process. Specifically, the potassium salt ore with high sodium chloride content is used as a raw material, and the crystal of potassium chloride in the potash salt ore is controlled by cold decomposition and crystallization technology. Particle size, and then use the flotation method to separate the cold crystallization mixed product to obtain the production process and equipment of large particle potassium chloride product. Background technique [0002] Potassium chloride is one of the important agricultural potassium fertilizers. IFA statistics show that the world demand for potash in 2011 was 36.44 million tons (in K 2 O), the demand for potassium fertilizer is increasing at a rate of about 1 million tons per year. China is a large agricultural country and the second largest potash...

Claims

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Application Information

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IPC IPC(8): C01D3/08
CPCC01D3/08
Inventor 唐娜赵思俭何永平李成宝田震韩兴泰程鹏高张蕾李洋孙劲松弓家谦刘建卫
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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