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Method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption

A low-grade, potassium chloride technology, applied in the field of inorganic salts, can solve the problems of hot-melt equipment scaling, poor economic benefits, and high energy consumption, and achieve low raw material grade requirements, optimized heat storage performance, and low energy consumption. Effect

Inactive Publication Date: 2020-01-31
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the utilization of low-grade potassium resources, the hot-melt-cold crystallization potassium chloride production process has been developed, which is the main way to recycle low-grade potassium ore in China. However, it encounters high energy consumption, scaling and corrosion of hot-melt equipment. Serious problems, poor economic benefits, need further technological innovation and upgrading

Method used

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  • Method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption
  • Method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption
  • Method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption

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Embodiment 1

[0023] Example 1, such as figure 1 , figure 2 As shown, the present invention provides a kind of method that utilizes low-grade potassium resource ore to prepare potassium chloride with low energy consumption, and concrete technical scheme comprises following preparation steps:

[0024] Step 1: Decompose low-grade potassium resource ore. Take 940.00kg of flotation tailings, add water to dissolve, the solid-to-liquid ratio is 1:0.8, filter to remove 377.88kg of solid phases such as sediment and undissolved matter, and prepare 562.12kg of potassium-soluble brine for later use;

[0025] The second step: Evaporating potassium-dissolved brine to produce potassium halite and carnallite. Get 562.12kg potassium-dissolving bittern, carry out natural evaporation, filter and make potassium halite and carnallite mixed solid phase 213.85kg, standby;

[0026] The third step: preparation of artificial potash salt. Take 213.85kg of potassium halite and carnallite as a mixed solid phase, ...

Embodiment 2

[0036] Example 2, such as figure 1 , image 3 As shown, the present invention provides a kind of method that utilizes low-grade potassium resource ore to prepare potassium chloride with low energy consumption, and concrete technical scheme comprises following preparation steps:

[0037] Step 1: Decompose low-grade potassium resource ore. Take 1104.84kg of flotation tailings, add water to dissolve, the solid-to-liquid ratio is 1:0.9, filter to remove 441.94kg of solid phases such as sediment and undissolved matter, and prepare 662.90kg of potassium-soluble brine for later use;

[0038] The second step: Evaporating potassium-dissolved brine to produce potassium halite and carnallite. Get 662.90kg potassium-dissolving bittern, carry out natural evaporation, filter and make potassium halite and carnallite mixed solid phase 251.35kg, standby;

[0039] The third step: preparation of artificial potash salt. Take 251.35kg of potassium halite and carnallite as a mixed solid phase, ...

Embodiment 3

[0049] Example 3, such as figure 1 , Figure 4 As shown, the present invention provides a kind of method that utilizes low-grade potassium resource ore to prepare potassium chloride with low energy consumption, and concrete technical scheme comprises following preparation steps:

[0050] Step 1: Decompose low-grade potassium resource ore. Take 1115.83kg of flotation tailings, add water to dissolve, the solid-to-liquid ratio is 1:0.7, filter to remove 457.49kg of solid phases such as sediment and undissolved matter, and prepare 658.34kg of potassium-soluble brine for later use;

[0051] The second step: Evaporating potassium-dissolved brine to produce potassium halite and carnallite. Get 658.34kg potassium-dissolving bittern, carry out natural evaporation, filter and make potassium halite and carnallite mixed solid phase 253.85kg, standby;

[0052] The third step: preparation of artificial potash salt. Take 253.85kg of potassium halite and carnallite as a mixed solid phase,...

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Abstract

The invention discloses a method for preparing potassium chloride from low-grade potassium resource ore at low energy consumption, and relates to the technical field of inorganic salt. The method comprises following steps: 1, decomposing low-grade potassium resource ore; 2, evaporating potassium dissolved brine to prepare sylvine and carnallite; 3, preparing artificial sylvine; 4, preparing a sylvine solution; 5, diluting the sylvine solution; 6, building a solar pond; 7, horizontally filling the solar pond layer by layer; 8, running the solar pond; 9, hot melting sylvine; 10, filtering; 11, cooling and crystallizing; and 12, low-temperature mother liquor recycling. The method has the beneficial effects that the energy consumption is low, the cost is saved, utilization of low-grade potassium resources is improved, the solubility of potassium chloride is improved, and the energy consumption in the recycling process of the low-grade potassium resources is reduced.

Description

technical field [0001] The invention relates to the technical field of inorganic salts, in particular to a technology for preparing potassium chloride using low-grade potassium resource ore with low energy consumption. Background technique [0002] Potassium chloride is an important strategically important fertilizer and chemical raw material. It is the main variety of potassium fertilizer. The active ingredient K 2 The content of O is usually about 60%. It is a chemically neutral and physiologically acidic quick-acting potassium fertilizer. It is widely used in rice, wheat, corn, cotton and other field crops. Potassium resources in my country are relatively short, and the basic reserves of potassium chloride in the country only account for about 2% of the global reserves, and they are mainly liquid ores, 95% of which are distributed in the Qaidam Basin in Qinghai and the northern depression in Lop Nur, Xinjiang. Potassium-deficient cultivated land in the country accounts f...

Claims

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Application Information

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IPC IPC(8): C01D3/04
CPCC01D3/04
Inventor 赵启文屠兰英陈建辉李秦鹏陈得清汤毅慧
Owner QINGHAI UNIVERSITY
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