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Method for producing high-quality potassium chloride

A production method and technology of potassium chloride, applied in the production of potassium chloride, multi-effect vacuum evaporation to produce high-quality potassium chloride, can solve the problems of waste of potassium resources, large emissions, increased pressure on environmental protection, etc., and achieve energy saving , achieve zero emissions and reduce steam consumption

Active Publication Date: 2013-06-12
唐山汇鑫嘉德节能减排科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, a large amount of metallurgical high-potassium dust is discharged every year in my country's iron and steel production, among which the discharge of high-potassium dust from sintering soot is the largest. This discharge not only increases the pressure on environmental protection, but also wastes precious potassium resources. Therefore, how to effectively utilize metallurgical high-potassium dust, reduce the pressure on environmental protection, and recycle the useful potassium resources in order to meet the needs of industrial and agricultural production is an important issue in the metallurgical and chemical industries

Method used

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  • Method for producing high-quality potassium chloride

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Effect test

Embodiment 1

[0024] A. The leaching solution of potassium-containing sintering soot ash (potassium chloride content is 251g / l, sodium chloride content is 55g / l) is sent into the first-stage preheater 10 through the delivery pipe 19, and evaporated with three effects The secondary steam produced by the tank 9 and the flash steam produced by the flash barrel 24 heat the leach solution in the primary preheater 10 to 50°C, send it to the secondary preheater 8, and use the second effect evaporation tank 7 to generate After the secondary steam in the secondary preheater 8 is heated to 70°C, it is sent to the tertiary preheater 6, and the secondary steam generated by the first-effect evaporator 3 is used to heat After the extract solution is heated to 95°C, it is sent to the fourth-stage preheater 5, and the condensate in the first-effect condensate bucket 1 is used to heat the extract solution in the fourth-stage preheater 5 to 110°C and sent to the first-effect evaporation In the tank heating c...

Embodiment 2

[0030] A. The leaching solution of potassium-containing sintering soot ash (potassium chloride content is 200g / l, sodium chloride content is 35g / l) is sent into the primary preheater 10 through the delivery pipe 19, and is evaporated by three effects The secondary steam produced by the tank 9 and the flash steam produced by the flash barrel 24 heat the leachate in the primary preheater 10 to 60°C, send it to the secondary preheater 8, and use the second effect evaporation tank 7 to generate After the secondary steam in the secondary preheater 8 is heated to 85°C, it is sent to the tertiary preheater 6, and the secondary steam generated by the first-effect evaporator 3 is used to heat After heating the extract solution to 108°C, send it to the fourth-stage preheater 5, use the condensed water in the first-effect condensate bucket 1 to heat the extract solution in the fourth-stage preheater 5 to 120°C and send it to the first-effect evaporation In the tank heating chamber 2; the...

Embodiment 3

[0036] A. The leaching solution of potassium-containing sintering soot ash (potassium chloride content is 270g / l, sodium chloride content is 65g / l) is sent into the primary preheater 10 through the delivery pipe 19, and is evaporated by three effects The secondary steam produced by the tank 9 and the flash steam produced by the flash tank 24 heat the leach solution in the primary preheater 10 to 55°C, send it to the secondary preheater 8, and use the second effect evaporation tank 7 to generate After the secondary steam in the secondary preheater 8 is heated to 80°C, it is sent to the tertiary preheater 6, and the secondary steam generated by the first-effect evaporator 3 is used to heat After the extract solution is heated to 102°C, it is sent to the fourth-stage preheater 5, and the condensate in the first-effect condensate bucket 1 is used to heat the extract solution in the fourth-stage preheater 5 to 119°C and sent to the first-effect evaporation In the tank heating chamb...

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Abstract

The invention provides a method for producing high-quality potassium chloride. The method is characterized by comprising the following steps of: preheating leach liquor containing potassium dust to the temperature of between 110 and 130 DEG C; performing first-effect evaporation, second-effect evaporation and third-effect evaporation sequentially to obtain a high-quality potassium chloride product; performing fourth-effect evaporation on evaporated liquor obtained after the third-effect evaporation to obtain an industrial potassium chloride product; returning evaporated liquor obtained after the fourth-effect evaporation and mixed condensed water to an extraction process; and extracting potassium-containing dust for recycling. The method has a simple process flow and is low in energy consumption; and by the method, wastewater discharging is avoided, environment friendliness is facilitated, resources are saved, a new application way is provided for the utilization of potassium-containing industrial wastes, and the aims of energy conservation, emission reduction and circular economy are fulfilled.

Description

technical field [0001] The invention relates to a production method of potassium chloride, in particular to a method for producing high-quality potassium chloride by using leaching solution of metallurgical high-potassium dust as a raw material and adopting multi-effect vacuum evaporation, belonging to the technical field of potassium salt production. Background technique [0002] Potassium resources occupy an important strategic position in the production of the national economy. Among them, potassium chloride is an important product and raw material in the chemical industry. It is the main raw material for the synthesis of potassium sulfate, potassium nitrate and potassium chlorate, and is also a potassium fertilizer product required for agricultural production. my country is a country with a serious shortage of potassium resources. In recent years, more than 60% of potassium in our country depends on imports. On the other hand, a large amount of metallurgical high-potassi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/26C01D3/04
Inventor 闫新平唐琼花
Owner 唐山汇鑫嘉德节能减排科技股份有限公司
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