Process for refining crude salt

A process and salt washing technology, which is applied in the direction of alkali metal chloride, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems that cannot meet the production of high-quality soda ash and industrial ammonium chloride The quality of industrial ammonium chloride, high investment in brine treatment and other issues, achieved the effect of qualified particle size, reduced loss of raw salt, and reduced scale

Active Publication Date: 2010-01-20
TIANJIN BOHUA YONGLI CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional salt washing process only takes the Ca2+, Mg2+ and trace SO42- impurities in the raw salt as the main purpose and the washing salt particle size as the main purpose, which can reduce AII turbidity, but cannot remove SO42-; in fact, SO42- is extremely harmful, and it will Accumulation in the mother liquor system will finally affect the quality of soda ash and industrial ammonium chloride
[0004] The existing sa

Method used

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  • Process for refining crude salt

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Effect test

Embodiment 1

[0054] (1) Salt washing step: (a) Send the raw salt into the salt washing machine, and use SO 4 2- Saturated brine washing solution with a content of not more than 10g / l is countercurrently washed and sent to a ball mill, and the ball mill crushes the raw salt to an average particle size of 0.35 mm and a particle distribution within the particle size range of >70%; (b ) put the pulverized raw salt into the primary salt slurry tank and adjust it to a 30% solid-liquid volume ratio with secondary brine, and then transport the salt slurry to the thickener in turn with a pump. Thick, primary centrifuge adopts condensed water to wash the salt slurry; (C) the salt slurry separated from the primary centrifuge is sent into the secondary salt slurry bucket with SO 4 2- The third-grade brine with a content of not more than 3.76g / l is adjusted so that the solid-liquid ratio is 30%, and then pumped to the classifier for flotation classification, and the qualified salt slurry after classi...

Embodiment 2

[0062] (1) Salt washing step: (a) Send the raw salt into the salt washing machine, and use SO 4 2- Saturated brine washing solution with a content not greater than 10g / l is countercurrently washed and sent to a ball mill, which crushes the raw salt to an average particle size of 0.3 mm and a particle distribution within the particle size range of >70%; (b ) put the pulverized raw salt into the primary salt slurry bucket and adjust it to a 25% solid-liquid volume ratio with a first-grade brine, and then transport the salt slurry to a thickener successively with a pump Thick, primary centrifuge adopts condensed water to wash the salt slurry; (C) the salt slurry separated from the primary centrifuge is sent into the secondary salt slurry bucket with SO 4 2- The third-grade brine with a content of not more than 3.76g / l is adjusted so that the solid-liquid ratio is 25%, and then pumped to the classifier for flotation classification, and the qualified salt slurry after classificat...

Embodiment 3

[0070] (1) Salt washing step: (a) Send the raw salt into the salt washing machine, and use SO4 2- Saturated brine washing solution with a content not greater than 10g / l is countercurrently washed and sent to a ball mill, and the ball mill pulverizes the raw salt to an average particle size of 0.42 mm and a particle distribution within the particle size range of >70%; (b ) put the pulverized raw salt into the primary salt slurry tank and adjust it to a 35% salt slurry depending on the solid-liquid volume ratio with a first-grade brine, and then transport the salt slurry to a thickener successively with a pump Thick, primary centrifuge adopts condensed water to wash the salt slurry; (C) the salt slurry separated from the primary centrifuge is sent into the secondary salt slurry bucket with SO 4 2- The third-grade brine with a content of not more than 3.76g / l is adjusted so that the solid-liquid ratio is 35%, and then pumped to the classifier for flotation classification, and th...

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Abstract

The invention discloses a process for refining crude salt. A salt-leaching step comprises the following steps: sending crude salt to a salt leaching device, a ball mill, a primary salt slurry barrel, a thickener and a primary centrifuge in sequence; then sending salt slurry separated from the primary centrifuge to a secondary salt slurry barrel, a classificator and an immediate washing barrel for washing and thickening; then using condensate water to wash the salt slurry after entering the secondary centrifuge so as to remove bittern, thereby obtaining qualified leached salt; a crude bittern treatment step comprises the following steps: mixing leaching crude bittern in the salt leaching step in a crude bittern pool, and subsequently sending to a calcium-magnesium reactor so as to remove Ca<2+> and Mg<2+>; then entering a clarifying tank for clarifying; after increasing the temperature of the clarified clear liquor by a bittern heater, sending portion of clarified clear liquor to a refining bittern barrel for vacuum salt manufacturing with portion of clarified clear liquor for salt leaching use; and a vacuum salt manufacturing step comprises the following steps: sending refined salt water in the refining bittern barrel to a multi-effect evaporator for evaporating; finally discharging separated solid salt to the salt slurry barrel, the salt slurry thickener and the vacuum centrifuge, thereby obtaining leached salt. The method reduces the crude salt loss and lowers the content of SO4<2-> in the leached salt.

Description

technical field [0001] The invention relates to a process for refining crude salt. Background technique [0002] There are two main manufacturing methods of soda ash: ammonia soda method and combined soda method. Among them, the combined alkali method uses solid salt as raw material, and the mother liquor system is recycled in a closed circuit. In this process, insoluble and soluble impurities in the solid salt enter the system, which will inevitably affect the quality of the final product. Therefore, it is necessary to use solid salt as raw material. Raw salt is refined. [0003] The quality of washing salt is assessed by the content of impurities in the salt and the particle size of the salt. The content of impurities in the salt is assessed by Ca2+, Mg2+, and SO42-; the particle size of the salt is also an important quality indicator. The traditional salt washing process only takes the Ca2+, Mg2+ and trace SO42- impurities in the raw salt as the main purpose and the was...

Claims

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Application Information

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IPC IPC(8): C01D3/04C02F9/10
Inventor 王春凡廖丽昕邹泽民刘钊飞张忠杰史天明李树旺
Owner TIANJIN BOHUA YONGLI CHEM IND
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