Process of preparing refined salt with sodium-containing bittern

A technology for refining salt and brine, applied in the direction of alkali metal chloride and the like, can solve the problems of low quality of refined salt, many impurities in sun-dried salt and high production cost, and achieve the effects of high product purity, simple process and low production cost.

Active Publication Date: 2008-07-16
BLUESTAR LEHIGH ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problem is that the sun-dried salt produced by salt field beach drying has many impurities and the quality of refined salt is not high; 2. The collected sodium-containing brine is directly transported to the production workshop, and is forced to evaporate in a multi-effect evaporator to make salt in vacuum
Its existing problems are large energy consumption and high production cost

Method used

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  • Process of preparing refined salt with sodium-containing bittern
  • Process of preparing refined salt with sodium-containing bittern

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1. refer to figure 1 , figure 2 . A kind of method that utilizes sodium-containing brine to produce refined salt, NaCl content is 8% sodium-containing brine and Mg 2+ The magnesium-containing brine with a content of 8% is added to the reaction zone 2 of the reaction vessel 4 at a constant speed in a weight ratio of 1:1, and the full-mixed flow is continuously stirred to carry out the halogen-mixed crystallization reaction, so that the crystals containing part of the smaller particle size 1 And the mother liquor of other impurity, overflow reaction vessel 4 upwards from the periphery 3 of reaction zone 2, the slurry that will contain larger particle size sodium chloride crystal 5 below reaction vessel 4 reaction zone 2 is from the lower outlet 6 of reaction vessel 4 Release and remove the mother liquor to obtain solid-phase sodium chloride crystals, that is, crude salt. After repulping, washing, filtering and drying, refined salt is obtained.

Embodiment 2

[0015] Example 2. refer to figure 1 , figure 2 . A kind of method that utilizes sodium-containing brine to produce refined salt, NaCl content is 24% sodium-containing brine and Mg 2+ The magnesium-containing brine with a content of 9.2% is added to the reaction zone 2 of the reaction vessel 4 at a constant speed in a ratio of 1:4 by weight, and the full-mixed flow and continuous stirring are carried out to carry out the halogen-mixed crystallization reaction, so that the crystals containing part of the smaller particle size 1 And the mother liquor of other impurity, overflow reaction vessel 4 upwards from the periphery 3 of reaction zone 2, the slurry that will contain larger particle size sodium chloride crystal 5 below reaction vessel 4 reaction zone 2 is from the lower outlet 6 of reaction vessel 4 Release and remove the mother liquor to obtain solid-phase sodium chloride crystals, that is, crude salt. After repulping, washing, filtering and drying, refined salt is obta...

Embodiment 3

[0016] Example 3. refer to figure 1 , figure 2 . A kind of method that utilizes sodium-containing brine to produce refined salt, the NaCl content is 15% sodium-containing brine and Mg 2+ The magnesium-containing brine with a content of 6.2% is added to the reaction zone 2 of the reaction vessel 4 at a constant speed in a ratio of 1:2 by weight, and the full-mixed flow is continuously stirred, and the halogen-mixed crystallization reaction is carried out for 90 minutes, so that the containing part has a smaller particle size The mother liquor of crystal 1 and other impurity overflows reaction vessel 4 upwards from the periphery 3 of reaction zone 2, and the slurry containing larger particle diameter sodium chloride crystal 5 below reaction vessel 4 reaction zone 2 is exported from the lower part of reaction vessel 6 release and remove the mother liquor to obtain the solid phase sodium chloride crystals, which is the crude salt. After repulping, washing, filtering and drying...

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Abstract

The process of preparing refined salt with sodium-containing bittern features that sodium-containing bittern with NaCl content of 8-24 wt% and magnesium-containing bittern with Mg2+ content of 6.2-9.2 wt% are mixed in the weight ratio of 1 to 1-4, the mixture is added into the reactor and stirred for producing halogen-eliminating crystallization reaction, the slurry containing NaCl crystal is drained in the lower part of the reactor while the mother liquid is overflowed in the periphery of the reactor, the slurry is separated to eliminate mother liquid to obtain crude salt of NaCl crystal, and the crude salt is washed, filtered and dried to obtain refined salt. The process is simple, low in cost, pollution-less and high in product quality, and the refined salt has average grain size of 0.15-0.30 mm and NaCl content of 98.5-99.5 wt%.

Description

technical field [0001] The invention relates to a method for preparing refined salt, in particular to a method for preparing refined salt by utilizing sodium-containing brine. Background technique [0002] In the prior art, the method of using sodium-containing brine to produce refined salt is as follows: 1. Pass the collected sodium-containing brine through salt field beach drying to precipitate sodium chloride to obtain solar salt, and then harvest the sun-dried salt produced by salt field beach drying. The salt goes to the processing plant for secondary processing such as impurity removal, washing and grading to obtain refined salt. The existing problem is that the sun-dried salt produced by salt field beach drying has many impurities and the quality of refined salt is not high; 2. The collected sodium-containing brine is directly transported to the production workshop, and is forced to evaporate in a multi-effect evaporator to make salt in vacuum . Its existing problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04C01D3/06
Inventor 张守祥张大义李灿先陆立勇朱晓东
Owner BLUESTAR LEHIGH ENG INST CO LTD
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