Method for extraction of potassium chloride crude product from sylvine ore by triboelectric separation

A technology of potash salt mine and triboelectric separation, applied in the direction of alkali metal chloride, etc., to achieve the effects of high yield, obvious economic benefits and strong operability

Active Publication Date: 2016-01-27
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no relevant report on the extraction of potassium ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Crushing: The solid potassium halite (main components: KCl and NaCl, of which, the mass percentage of KCl is 43%, and the mass percentage of NaCl is 55%) is subjected to two-stage closed-circuit crushing, and the particle size range of the controlled material is 1~2mm; (2) Grinding: Grind the crushed material obtained in step (1) until the mass content of the material ≤ 200 mesh is 90%; (3) Surface pretreatment: Grind the material obtained in step (2) The material after grinding is sent to the preprocessor, and 20g sodium hexametaphosphate / t potassium halite is added to mix evenly; (4) Electrostatic separation: the material after adding sodium hexametaphosphate in step (3) is sent to the electric separator , potassium chloride was selected by triboelectricity, and the crude product of potassium chloride was obtained, the content of KCl was 90%, and the yield of KCl was 89%.

Embodiment 2

[0026] (1) Crushing: The solid potassium halite (main components: KCl and NaCl, wherein the mass percentage of KCl is 45%, and the mass percentage of NaCl is 50%) is subjected to two-stage closed-circuit crushing, and the particle size range of the controlled material is 1~1.5mm; (2) Grinding: Grinding the crushed material obtained in step (1) until the mass content of the material is ≤200 mesh to 90%; (3) Surface pretreatment: Grinding the material in step (2) The obtained ground material is sent to the preprocessor, and 20g of salicylic acid / t potassium halite is added to mix evenly; (4) Electrostatic separation: the material after adding salicylic acid in step (3) is sent to the electric separator, Triboelectrically select potassium chloride to obtain a crude product of potassium chloride with a KCl content of 89.4% and a KCl yield of 90%.

Embodiment 3

[0028] (1) Crushing: the solid potassium halite (main components: KCl, NaCl and KCl MgCl 2 ·6H 2 O, wherein, KCl mass percentage content is 30%, NaCl mass percentage content is 60%, KCl MgCl 2 ·6H 2 O mass percentage is 8%) for secondary closed-circuit crushing, and the particle size range of the controlled material is 1 to 1.5mm; (2) Grinding: Grinding the crushed material obtained in step (1) to a size of ≤200 mesh The mass content of the material is 90%; (3) surface pretreatment: send the ground material obtained in step (2) to the preprocessor, add 200g dodecylamine / t potash rock salt ore and mix evenly; (4) static electricity Separation: The material after adding dodecylamine in step (3) is sent to an electric separator, and potassium chloride is triboelectrically separated to obtain a crude potassium chloride product with a KCl content of 75.4% and a KCl yield of 90%.

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Abstract

A method for extraction of a potassium chloride crude product from sylvine ore by triboelectric separation comprises the following steps: (1) crushing, to be more specific, solid sylvine ore is crushed, the material particle size is controlled in the range of 1-2mm; (2) ore grinding, to be more specific, the material crushed in the step (1) is ground until the mass content of the material less than or equal to 200 mesh is greater than or equal to 90%; (3) surface pretreatment, to be more specific, the material ground in the step (1) is sent into a preprocessor, and is added with a surface modifier for uniform mixing; and (4) electrostatic separation, to be more specific, the material added with the surface modifier in the step (3) is sent into an electrostatic separator for triboelectric separation of potassium chloride to obtain the potassium chloride crude product. The method does not require the use of saturated liquor, is not affected by factors such as temperature, pressure, and the like, ultimately does not produce sewage, and is simple in process, easy to operate, free of pollution, and good in separation efficiency, the yield is up to 90%; the resulting chloride potassium crude product has good quality, the chloride potassium content is up to 90%, and the economic benefit is obvious.

Description

technical field [0001] The invention relates to a method for extracting a crude potassium chloride product from a potash halite, in particular to a method for extracting a crude potassium chloride product from a potash halite by friction electric separation. Background technique [0002] Potassium fertilizer is one of the three basic fertilizers (nitrogen, phosphorus and potassium) in agriculture. At present, the potassium-deficient cultivated land area in China accounts for 60% of the total cultivated land area, which seriously affects the yield and quality of crops. China is the world's largest consumer of potash fertilizer. According to statistics from the China Inorganic Salt Industry Association, the total apparent consumption of potash fertilizer in China reached 17.42 million tons in 2014, an increase of 19.1% over 2013. Among the seven most scarce mineral resources in China (oil and gas, iron-rich ore, potassium salt, copper ore, bauxite, manganese ore, and chromium ...

Claims

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Application Information

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IPC IPC(8): C01D3/08
Inventor 谭之海汤建良胡勇季荣杨清
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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