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Method for continuous production of ferric chloride

A technology of ferric chloride and ferric chloride crystal, which is applied in the fields of ferric halide, chemical industry, climate sustainability, etc., can solve the problems of long crystallization process time, time-consuming feeding and discharging, low production efficiency, etc., to avoid Abnormal shaking phenomenon, shortening crystallization time, and improving production efficiency

Active Publication Date: 2019-11-15
3R ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production process of ferric chloride hexahydrate, when the high-concentration ferric chloride concentrate crystallizes, crystals are easy to deposit at the bottom of the crystallization tank, which blocks equipment and pipelines; when the low-concentration ferric chloride concentrate crystallizes, it needs to be cooled The material reaches a lower temperature, the energy consumption is higher, and the crystallization rate is lower
Moreover, the production method of ferric chloride hexahydrate is intermittent production, which has the disadvantages of time-consuming feeding and discharging, long crystallization process time, and high labor intensity, resulting in low production efficiency.

Method used

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  • Method for continuous production of ferric chloride

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Pump the ferric chloride solution into the evaporator to circulate and evaporate and concentrate at 100°C to 130°C to obtain concentrated ferric chloride (Fe 3+ : 20.0%, Fe 2+ : 0.05%, HCl: 0.38%). The mother liquor (Fe 3+ : 21.02%, Fe 2+ : 0.02%, HCl: 0.31%) stirred in the tempering reactor to obtain ferric chloride homogeneous liquid (Fe 3+ : 20.5%, Fe 2+ : 0.04%, HCl: 0.34%), feed cooling water into the jacket of the quenching and tempering reactor to reduce the material temperature to 33°C. Transfer the material liquid into the crystallization kettle, open and set the stirring speed to be 40r / min, open the cooling water valve to maintain the material temperature at 31°C, add 0.5% ferric chloride seed crystals for the first crystallization, and the material residence time is 1.5 hours to obtain The ferric chloride crystal slurry with a solid content of 20% enters the thickener to increase the solid content of the ferric chloride crystal slurry to 40%. Treatment...

Embodiment 2

[0041] Pump the ferric chloride solution into the evaporator to circulate and evaporate and concentrate at 100°C to 130°C to obtain concentrated ferric chloride (Fe 3+ : 24.0%, Fe 2+ : 0.06%, HCl: 0.26%). The mother liquor (Fe 3+ : 21.72%, Fe 2+ : 0.02%, HCl: 0.30%) stirred in the tempering reactor, and added an appropriate amount of low-concentration ferric chloride solution to obtain ferric chloride homogeneous liquid (Fe 3+ : 22.0%, Fe 2+ : 0.02%, HCl: 0.26%), feed cooling water into the jacket of the quenching and tempering reactor to reduce the material temperature to 35°C. Transfer the material liquid into the crystallization kettle, open and set the stirring speed to be 70r / min, open the cooling water valve to maintain the material temperature at 33°C, add 1% ferric chloride seed crystals during the first crystallization, and the material residence time is 1h to obtain The ferric chloride crystal slurry with a solid rate of 30% enters the thickener to increase the ...

Embodiment 3

[0043] Pump the ferric chloride solution into the evaporator to circulate and evaporate and concentrate at 100°C to 130°C to obtain concentrated ferric chloride (Fe 3+ : 22.0%, Fe 2+ : 0.02%, HCl: 0.28%). The mother liquor (Fe 3+ : 21.72%, Fe 2+ : 0.02%, HCl: 0.14%) stirred in the conditioning reactor, and added an appropriate amount of water to obtain ferric chloride homogeneous liquid (Fe 3+ : 21.0%, Fe 2+ : 0.01%, HCl: 0.16%), feed cooling water into the jacket of the quenching and tempering reactor to reduce the material temperature to 34°C. Transfer the material liquid into the crystallization kettle, open and set the stirring speed as 60r / min, open the cooling water valve to maintain the material temperature at 32°C, add 0.7% ferric chloride seed crystals during the first crystallization, and the material residence time is 1.2 hours to obtain The ferric chloride crystal slurry with a solid content of 25% enters the thickener to increase the solid content of the ferr...

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Abstract

The invention discloses a method for continuous production of ferric chloride. The method is characterized in that a ferric chloride solution is successively subjected to evaporating concentration, modification cooling, cooling crystallization, thickening and continuous separation to obtain a solid ferric chloride hexahydrate product. The method of the invention solves the problems of crystallization deposition at the bottom of a crystallization kettle, high energy consumption and low intermittent production efficiency in the production process of ferric chloride hexahydrate. The method optimizes the crystallization process of ferric chloride, so the crystallization time is shortened, the continuous production of ferric chloride hexahydrate is realized, the crystal deposition at the bottomof the crystallization kettle is avoided, the energy consumption is reduced, the production efficiency is improved, and the obtained ferric chloride product has a high content and a large particle size.

Description

technical field [0001] The invention relates to the technical field of ferric chloride production methods, in particular to a method for continuous production of ferric chloride. Background technique [0002] Ferric chloride hexahydrate is yellow-brown crystal or massive solid, odorless, with astringent taste. The melting point is 37°C, and the boiling point is 280°C to 285°C. Soluble in water, soluble in ethanol, ether. Its aqueous solution is strongly acidic and can coagulate proteins. It is deliquescent and can deliquesce into a reddish-brown liquid in the air. Ferric chloride is mainly used as a water treatment agent. In addition, it is also used as printing plate making, stainless steel etchant, oxidant and mordant in the dye industry, chlorinated leaching agent in the metallurgical industry, colorant in the glass industry, concrete early strength agent and waterproofing agent in the construction industry, used for iron Salt pigments, pharmaceuticals, raw materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/10
CPCC01G49/10C01P2006/82Y02P20/10
Inventor 吴勇基丁德才肖晋宜周小江樊文星陈景冬华蔓陈海雄
Owner 3R ENVIRONMENTAL TECH CO LTD
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