Method of extracting potassium chloride raw products in sylvinite ore through air jigging

A technology for potassium rock salt mine and potassium chloride, which is applied in the field of extracting crude potassium chloride in potassium rock salt mine, and achieves the effects of high yield, good quality and simple process flow

Active Publication Date: 2015-12-09
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 has been no report on the extraction of potassium chloride from...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Crushing: The solid potash salt ore (main components: KCl and NaCl, of which, the mass percentage of KCl is 43%, and the mass percentage of NaCl is 50%) is subjected to two-stage closed-circuit crushing to control the particle size range of the ore sample (2) Jig separation: send the crushed material obtained in step (1) into the wind jigging separator, and use 0.5MPa compressed air + magnetite powder to form a density of 2.0g / cm 3 The gas-solid suspension is used as the medium, and sodium chloride and potassium chloride are separated by jigging separation to obtain potassium chloride concentrate and sodium chloride tailings, and the sodium chloride tailings are separated into magnetite by magnetic separation powder, and the sodium chloride tailings after magnetic separation are used for backfilling; (3) Magnetic separation: send the potassium chloride concentrate obtained in step (2) into a magnetic separator to recycle magnetite powder to obtain potassium chloride ...

Embodiment 2

[0035] (1) Crushing: The solid potash salt ore (main components: KCl and NaCl, of which, the mass percentage of KCl is 45%, and the mass percentage of NaCl is 45%) is subjected to two-stage closed-circuit crushing to control the particle size range of the ore sample. (2) Jig separation: Send the crushed material obtained in step (1) into the wind jig separator, and use 1.0MPa compressed air + ferrosilicon powder to form a density of 2.08g / cm 3 The gas-solid suspension is used as the medium, and sodium chloride and potassium chloride are separated by jigging separation to obtain potassium chloride concentrate and sodium chloride tailings, and the sodium chloride tailings are separated by magnetic separation to obtain ferrosilicon powder , the sodium chloride tailings after magnetic separation are used for backfilling; (3) Magnetic separation: send the potassium chloride concentrate obtained in step (2) into a magnetic separator to recover ferrosilicon powder to obtain potassium ...

Embodiment 3

[0037](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 55%, carnallite KCl MgCl 2 ·6H 2 O mass percentage content is 10%) for two-stage closed-circuit crushing, and the average particle size of the ore sample is controlled to be 1-2mm; (2) The first stage of jigging separation: the crushed material obtained in step (1) is sent to the wind jigging Sorting machine, with 1.2MPa compressed air + magnetite powder to form a density of 2.02g / cm 3 The gas-solid suspension medium is separated by jigging to separate potassium chloride, carnallite and sodium chloride to obtain potassium chloride, carnallite mixed concentrate and sodium chloride tailings, and the sodium chloride tailings Magnetite powder is separated by magnetic separation, and the sodium chloride tailings after magnetic separation are used for backfilling; (3) The second stage of jigging separation:...

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Abstract

A method of extracting potassium chloride raw products in sylvinite ore through air jigging comprises the following steps of (1) crashing: crashing solid sylvinite ore; (2) jigging separation: feeding crashed materials into an air jigging separator, taking gas-solid suspensoid of pressurized air plus magnetite powder or ferrosilicon powder as a medium to separate sodium chloride from potassium chloride, so as to obtain potassium chloride concentrate and sodium chloride tailings; or when the sylvinite ore contains carnallite, performing a first section of jigging separation to obtain potassium chloride and carnallite bulk concentrate and sodium chloride tailings, and then performing a second section of jigging separation to obtain potassium chloride concentrate and carnallite tailings; (3) magnetic separation: feeding the potassium chloride concentrate into a magnetic separator, and recycling the magnetite powder or the ferrosilicon powder, so as to obtain a potassium chloride product. According to the method, the cyclic utilization rate of the medium is high, the technological process is simple, the operability is high, the separation result is good, the yield coefficient can reach up to 90 percent, the content of KCL in the obtained potassium chloride product is larger than or equal to 72 percent, and the method is specially suitable for water-deficient areas.

Description

technical field [0001] The invention relates to a method for extracting crude potassium chloride from potash halite, in particular to a method for extracting crude potassium chloride from underground mining of potash halite by wind jigging. Background technique [0002] Potassium fertilizer is one of the three basic fertilizers (nitrogen, phosphorus, and potassium) in agriculture. At present, the area of ​​potassium-deficient cultivated land in China accounts for 60% of the total cultivated area. Potassium deficiency seriously affects the yield and quality of crops. China is the world's largest consumer of potash fertilizers. According to statistics from the China Inorganic Salt Industry Association, the total apparent consumption of potash fertilizers 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 谭之海汤建良甘顺鹏胡勇罗稳
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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