Method for extracting industrial slat from salt mixture
A technology of industrial salt and mixed salt, applied in the field of refined industrial salt, can solve problems such as single processing capacity
Active Publication Date: 2014-11-19
INNER MONGOLIA WUHAI CHEM IND
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Problems solved by technology
"However, the processing capacity of this method is relatively single, and there are still many deficiencies in the separation of multi-component mixed solid salts
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0019] Such as figure 1 Shown, a kind of mixed salt extracts the method for industrial salt, and it comprises the steps:
[0020] a. The raw salt is first ground into fine salt particles with a diameter of less than 5 mm through the crushing step, and the fine salt particles are sieved and transported to the raw salt storage hopper through a conveyor belt;
[0021] b. The fine salt particles in the raw salt storage hopper are transported to the salt dissolving device through the conveyor belt, and the fine salt particles contact and dissolve with the nearly saturated brine from the countercurrent flow in the washing brine bucket, and the fine salt particles follow the rotation of the salt dissolving device and are arranged on the inner wall The spiral blades are agitated and pushed to the outlet;
[0022] c. The fine salt particles treated by the salt dissolver are...
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Abstract
The invention discloses a method for extracting industrial slat from salt mixture. The method comprises the following steps: grinding crude salt into fine salt through a crushing step, conveying the fine salt to a salt dissolver to rotate along with the salt dissolver, wherein the fine salt is pushed to the outlet through the stirring of blades arranged in spiral at the inner wall; filtering the fine salt treated by the salt dissolver, wherein the product can be directly used by the salt enterprise; enabling the liquid part in the salt dissolver with fine sand to flow into a blending pot to mixing and reacting with soda waste liquor and calcium carbide mud, removing the SO4<2-> and Mg<2+>, placing the reaction mixture into a settling tank to separate the solid from the liquor, filter-pressing the solid phase part, and discharging, flowing back a part of the clarified liquor into the salt dissolver to dissolve new fine salt, forming the circulation, wherein the other part of the clarified liquor is placed in a salt dissolving barrel to saturate the NaCl so as to be used for soda. The pure impurities containing SO42- such as solid NaCl, MgSO4 and the like are remained in the liquid phase, and the aims of separating and purifying are achieved.
Description
technical field [0001] The invention belongs to a method for preparing industrial salt from a mixed salt, in particular, in the soda ash industry, the soda ash by-product ammonia distillation waste liquid is used to purify and separate the mixed salt to obtain refined industrial salt. Background technique [0002] The surface layer of magnesite ore in Ejina Banner is covered with a layer of crystalline salt cover ranging from 20 to 50 cm. This crystalline salt cover is hereinafter referred to as forehead salt. The main component of forehead salt is NaCl, and the NaCl content is 90 to 95%. For magnesium sulfate, Na 2 SO 4 , Ca 2+ and insoluble matter, because the crystalline salt cap cannot be completely separated from the langbeinite layer during the mining process, it is inevitable to mix part of the garbeinite, resulting in the mixing of salt and alum. The NaCl content of this mixture is 60-90%, and the sodium-magnesium Alum is between 10% and 30%, specifically SO 2- ...
Claims
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IPC IPC(8): C01D3/14
Inventor 殷付中田继杜建忠郝海兵周鑫王军刘江飞张艳龙牛世军王敏娜
Owner INNER MONGOLIA WUHAI CHEM IND