Process of producing potassium chloride with sintered ash from chamotte kiln

A potassium chloride and clinker kiln technology, applied in the removal of alkali metal chloride and solid waste, can solve the problems of high operating cost, waste, and high cost, and achieve the goal of reducing environmental pollution, reducing production costs, and being easy to control. Effect

Active Publication Date: 2009-11-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production of potassium chloride from potash salt ore and carnallite requires grinding and flotation of raw materials, a series of complex processes such as decomposition and impurity removal, and then repeated evaporation and crystallization to obtain potassium chloride products. The production process The process is long, the content of potassium chloride in the production raw materials is low, and the operating cost is high. In addition to the high cost of extracting potassium chloride from bittern, there is also the disadvantage of low potassium chloride yield
[0003] On the other hand, kiln dust is discharged as a waste collected by the dust collection system in the alumina production process, which not only pollutes the environment, but also the active ingredient K 2 O, Na 2 O, SO 4 2- Waiting to be discarded, resulting in a certain degree of waste

Method used

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  • Process of producing potassium chloride with sintered ash from chamotte kiln

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Effect test

Embodiment 1

[0031] The method of utilizing alumina kiln dust to produce potassium chloride of the present invention, operation is as follows:

[0032] First, use distilled water at a liquid-solid ratio of 0.9 to stir and leach the kiln dust at a constant speed of 90°C, keep the leachate at 60°C for 30 minutes, and add the chemical reagent CaCl 2 Stir to remove impurity SO 4 2- , the total desulfurization rate can reach 90%, and the final product of the desulfurization reaction is CaSO 4 0.5H 2 O, its particle size D 50 : 6.526μm, can be sold as a by-product.

[0033] Heating, evaporating, and concentrating the desulfurized solution until the volume of the slurry is 3 / 5 of the volume before evaporation and concentration. At this time, crystals are precipitated from the solution. The precipitated crystals are NaCl with a purity of more than 90% and can be sold as by-products . Keep the mother liquor at 95°C, add industrial potassium chloride with a fineness of 75-150 μm to the mother ...

Embodiment 2

[0035] The method of utilizing alumina kiln dust to produce potassium chloride of the present invention, operation is as follows:

[0036] Use distilled water at a liquid-solid ratio of 1.0 to stir and leach the kiln dust at a constant speed at 90°C, keep the leachate at 90°C for 30 minutes, carry out liquid-solid separation at this temperature, and add chemical reagent CaCl to the mother liquor 2 Stir to remove impurity SO 4 2- , the total desulfurization rate can reach 92%, and the final product of the desulfurization reaction is CaSO 4 0.5H 2 O, its particle size D 50 : 6.326μm, can be sold as a by-product.

[0037] The desulfurized solution is heated, evaporated, and concentrated until the volume of the slurry is 3 / 5 of the volume before evaporation and concentration. At this time, crystals are precipitated from the solution. The precipitated crystals are NaCl with a purity of 91%, which can be sold as by-products. Keep the mother liquor at 95°C, add industrial potass...

Embodiment 3

[0039] The method of utilizing alumina kiln dust to produce potassium chloride of the present invention, operation is as follows:

[0040] Use distilled water at a liquid-solid ratio of 1.1 to stir and leach kiln dust at a constant speed at 90°C, keep the leaching liquid at 90°C for 30 minutes, carry out liquid-solid separation at this temperature, and add chemical reagent CaCl to the mother liquor 2 Stir to remove impurity SO 4 2- , the total desulfurization rate can reach ≥90%, and the final product of the desulfurization reaction is CaSO 4 0.5H 2 O, its particle size D 50 : 7.523μm, can be sold as a by-product.

[0041]The desulfurized solution is heated, evaporated, and concentrated until the volume of the slurry is 1 / 5 of the volume before evaporation and concentration. At this time, crystals are precipitated from the solution. The precipitated crystals are NaCl with a purity of 90%. They can be sold as by-products. Keep the mother liquor at 95°C, add industrial pota...

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Abstract

The invention relates to a method for producing potassium chloride by using alumina clinker kiln dust in a sintering method, which belongs to the production technology of potassium salt. Firstly, the kiln dust is leached with distilled water, and the leaching solution is added with a desulfurizing agent for desulfurization, and the desulfurized leaching solution is heated, Evaporate and concentrate, conduct the first crystallization, separate the crystals, evaporate and concentrate the separated primary crystallization mother liquor again, cool to obtain the second crystallization, separate the crystallization, evaporate and concentrate the filtrate and heat it to 80-99°C to become a saturated solution , plus seed crystals, and after cooling and natural cooling, mixed potassium chloride crystals are precipitated. Make full use of alumina kiln dust, turn waste into treasure, reduce environmental pollution caused by waste discharge, and reduce the production cost of potassium chloride. The product potassium chloride and by-products can be obtained through water leaching, impurity removal, evaporation and crystallization of kiln dust Sodium chloride and CaSO4·0.5H2O, and the process is short, low energy consumption, easy to operate, which is beneficial to obtain potassium chloride products with high purity.

Description

technical field [0001] The invention relates to a method for producing potassium chloride by using alumina clinker kiln dust in a sintering method, which belongs to the potassium salt production technology and also belongs to the recycling technology of waste material kiln dust in the alumina production process. Background technique [0002] Potassium chloride is an important chemical and agricultural raw material with a wide range of uses. The industrial production methods of potassium chloride include flotation, decomposition-flotation combined method and dehalogenation method, etc., and the raw materials used are potassium halite, carnallite or bittern. Generally, potassium halite contains 10-12% KCl, carnallite contains 16-18% KCl, and bittern contains 17-20% KCl. The production of potassium chloride from potash salt ore and carnallite requires grinding and flotation of raw materials, a series of complex processes such as decomposition and impurity removal, and then rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04B09B3/00
Inventor 潘明亮戚丽娜王军堂李海荣
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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