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Method for producing enriched potassium chloride by downhole fractional decomposition of solid potash salt ore

A production method and technology of potassium chloride, applied in the direction of alkali metal chloride, etc., can solve the problems of limited mining lifting capacity, unstable ore properties, easy weathering and deliquescence, etc., and achieve reduced mining lifting costs, large production capacity, and high production capacity. The effect of low consumption

Inactive Publication Date: 2012-03-21
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carnallite ore in the solid potassium salt mine is affected by the law of sedimentation and mineralization. The ore is unstable and easy to weather and deliquescence. The conventional mining excavation method is used to lift from underground to the ground to process potassium chloride products. Its mining lifting capacity is limited by the investment in shaft engineering. limits

Method used

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  • Method for producing enriched potassium chloride by downhole fractional decomposition of solid potash salt ore
  • Method for producing enriched potassium chloride by downhole fractional decomposition of solid potash salt ore
  • Method for producing enriched potassium chloride by downhole fractional decomposition of solid potash salt ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw ore input is 1.00 tons / hour.

[0025] (1) The chemical composition of the comprehensive ore sample is:

[0026]

[0027] (2) Closed-circuit screening and decomposition

[0028] The purpose of closed-circuit screening and decomposition is to control the particle size of the raw ore within 10mm through wet screening. The raw ore larger than 10mm is 15% of the ore input. After closed-circuit crushing and screening, the final raw ore particle size is -10mm and directly enters the decomposition. The amount of water added for screening and decomposition is 0.30 tons / hour, the circulating mother liquor is 0.38 tons / hour, the produced slurry is 1.68 tons / hour, and the raw ore decomposition rate is 90.17%.

[0029] (3) Selective grading

[0030] The slurry produced by closed-circuit screening and decomposition is selectively classified to obtain enriched fine-grained potassium chloride. The slurry volume is 1.41 tons / hour, the slurry concentration is 14.72%, and the pot...

Embodiment 2

[0032] Raw ore input is 1.00 tons / hour.

[0033] (1) The chemical composition of the comprehensive ore sample is:

[0034]

[0035] (2) Closed-circuit screening and decomposition

[0036] The purpose of closed-circuit screening and decomposition is to control the particle size of raw ore within 10mm through wet screening, and the raw ore larger than 10mm is 13.76% of the ore input. After closed-circuit crushing and screening, the final raw ore particle size is -10mm and directly enters decomposition. The amount of water added for screening and decomposition is 0.39 tons per hour, the resulting slurry is 1.39 tons per hour, and the raw ore decomposition rate is 94.31%.

[0037] (3) Selective grading

[0038] The slurry produced by closed-circuit screening and decomposition is selectively classified to obtain enriched fine-grained potassium chloride. The slurry volume is 1.23 tons / hour, the slurry concentration is 15.75%, and the potassium chloride content of solids in the ...

Embodiment 3

[0040] The raw ore feeding rate is 2.00 tons / hour.

[0041] (1) The chemical composition of the comprehensive ore sample is:

[0042]

[0043] (2) Closed-circuit screening and decomposition

[0044] The purpose of closed-circuit screening and decomposition is to control the particle size of the raw ore within 10mm through wet screening. The raw ore larger than 10mm is 15.5% of the ore input. After closed-circuit crushing and screening, the final raw ore particle size is -10mm and directly enters the decomposition Screening and Decomposition The amount of water added for decomposition is 0.94 tons / hour, the resulting slurry is 2.94 tons / hour, and the decomposition rate of raw ore is 97.28%.

[0045] (3) Selective grading

[0046]The slurry produced by closed-circuit screening and decomposition is selectively classified to obtain enriched fine-grained potassium chloride. The slurry volume is 2.73 tons / hour, the slurry concentration is 17.23%, and the potassium chloride cont...

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Abstract

The invention provides a method for producing enriched potassium chloride by downhole fractional decomposition of solid potash salt ore, belongs to the technical field of chemical mineral processing, and in particular relates to a dry mining process of land burial carnallite potash salt ore, and the dry mining process is one of technological processes for improving the mining capability of the potash salt ore and lowering the production and backfill cost of potassium chloride. The method comprises the following process flows: mining the land burial carnallite potash salt ore by a drill jumbo to obtain raw solid potash salt ore; sieving the raw potash salt ore for decomposition in a downhole closed-circuit manner; selectively grading to obtain enriched potassium chloride slurry; conveying the slurry to ground through a pump; and finally producing the potassium chloride product by a flotation system. The method provided by the invention has the remarkable beneficial effects that under the existing investment conditions of lifting the potash salt ore to the ground by a vertical shaft and then producing the potassium chloride, the potassium chloride slurry is enriched by directly adopting underground mining and vertical shaft facilities, thus greatly improving the capability of the existing solid potash salt ore for producing the potassium chloride and greatly lowering the production cost and tailings backfill investment. Therefore, the method is applicable to producing the potassium chloride fertilizer product by downhole dry mining and processing of the land burial carnallite potash salt ore, thus achieving high industrial popularization value.

Description

technical field [0001] The invention belongs to the technical field of chemical mineral processing, and in particular relates to a process for producing potassium chloride at low cost through underground decomposition and classification enrichment of potassium chloride in the solid potassium salt ore after underground mining of the solid potassium salt ore. Background technique [0002] Potassium fertilizer is an essential basic fertilizer for agriculture. The annual demand for potash fertilizer in my country is far greater than the production capacity. In neighboring countries of my country, there are relatively large reserves of solid potassium salt mines, which can be mined through underground mining—chemical flotation. Method for resource development. [0003] Most of the world's potassium chloride products are derived from buried potash halite mines and salt lake brine evaporated carnallite crystal mines. The conventional mining techniques for potash salt mines include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04
Inventor 曾波王国栋李骥
Owner YUNNAN CHEM RES INST
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