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Refining process of refined brine for soda ash production

A refined brine and process technology, applied in the direction of alkali metal carbonates, alkali metal chlorides, alkali metal compounds, etc., can solve the problems of large fluctuations in calcium and magnesium content, reduce refined brine, increase the production cost of soda ash, etc., to reduce turbidity Degree, the effect of increasing the salt content

Active Publication Date: 2021-02-19
山东海天生物化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the lime-soda ash method is used for refining brine, but the seawater used to prepare refined brine and the original salt have high calcium and magnesium content, and the large amount of lime milk and soda ash added has a great influence on the salt content of the refined brine, and the calcium and magnesium content of the original salt Calcium carbonate and magnesium hydroxide generated after the reaction of calcium removal and magnesium hydroxide settle slowly, thus affecting the turbidity of refined brine
The low salinity of refined brine and the fluctuation of turbidity of refined brine have a great impact on the output and quality of soda ash. At present, major soda ash factories adopt different methods to solve the problem of salt and turbidity of refined brine, such as using multiple refined decalcification magnesium method and brine nanofiltration method to reduce calcium and magnesium to ensure the salinity and turbidity of the refined brine, but the above two methods require high investment, and more personnel are assigned to the posts, resulting in an increase in the production cost of soda ash. Although the turbidity of the refined brine is reduced to a certain extent, the The effect is poor and it will also reduce the salt content in the refined brine

Method used

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  • Refining process of refined brine for soda ash production
  • Refining process of refined brine for soda ash production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A process for refining refined brine for soda ash production, comprising the following steps:

[0022] (1) to the content of calcium ion less than 1.4tt, the content of magnesium ion is less than 2.5tt crude brine (temperature is 40 DEG C) while adding fine powder salt (the content of sodium chloride in the fine powder salt ≥ 95.5%, calcium magnesium ion ≤0.05%, sulfate ion ≤0.3%.) and causticizing liquid (the concentration of sodium carbonate in the causticizing liquid is 20tt and the concentration of sodium hydroxide is 35tt), and the addition of crude brine is 1100m 3 / h, the amount of causticizing liquid added is 50m 3 / h, the add-on of fine powder salt is 6 tons / h, and stirring and mixing obtains standby brine after the reaction of 30min;

[0023] (2) The standby brine in step (1) is added to the sedimentation aid solution during the transportation process, and the standby brine and the sedimentation aid solution are separated according to 900m 3 / h:10m 3 Add in...

Embodiment 2

[0025] A process for refining refined brine for soda ash production, comprising the following steps:

[0026] (1) to the content of calcium ion is less than 1.4tt, and the content of magnesium ion is less than 2.5tt crude brine (temperature is 43 ℃) and adds fine powder salt (the content of sodium chloride in fine powder salt ≥ 95.5%, calcium magnesium ion ≤0.05%, sulfate ion ≤0.3%.) and causticizing liquid (the concentration of sodium carbonate in the causticizing liquid is 25tt and the concentration of sodium hydroxide is 40tt), and the amount of crude brine added is 1150m 3 / h, the amount of causticizing liquid added is 55m 3 / h, the add-on of described fine powder salt is 6.5 tons / h, it is standby after stirring and mixing through the reaction of 35min;

[0027] (2) Add the settling aid solution to the spare brine in step (1) during the transportation process, and the spare brine and settling aid solution shall be prepared according to 1000m 3 / h:10m 3 Add in the ratio ...

Embodiment 3

[0029] A process for refining refined brine for soda ash production, comprising the following steps:

[0030] (1) to the content of calcium ion is less than 1.4tt, and the content of magnesium ion is less than 2.5tt crude brine (temperature is 43 ℃) and adds fine powder salt (the content of sodium chloride in fine powder salt ≥ 95.5%, calcium magnesium ion ≤0.05%, sulfate ion ≤0.3%.) and causticizing liquid (the concentration of sodium carbonate in the causticizing liquid is 25tt and the concentration of sodium hydroxide is 40tt), and the amount of crude brine added is 1150m 3 / h, the amount of causticizing liquid added is 55m 3 / h, the add-on of described fine powder salt is 6.5 tons / h, it is standby after stirring and mixing through the reaction of 35min;

[0031] (2) Add the settling aid solution to the spare brine in step (1) during the transportation process, and the spare brine and settling aid solution shall be prepared according to 1000m 3 / h:10m 3 Add in the ratio ...

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Abstract

The invention relates to the technical field of soda ash production, in particular to a refining process of refined brine for soda ash production, which comprises the following steps: (1) simultaneously adding fine powder salt and causticizing liquid into crude brine, conducting stirring and mixing, and conducting reacting to obtain standby brine; and (2) adding a settling agent solution into thestandby saline water in the step (1) in the conveying process, and conducting standing and clarifying in a clarifying tank to obtain refined saline water. By utilizing the method, the content of saltin the refined salt water can be increased, and the turbidity of the refined salt water is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of soda ash production, in particular to a process for refining refined brine for soda ash production. Background technique [0002] In the production process of soda ash, the requirements for the salt content and quality of refined brine are very high. Stabilizing the salt content and turbidity of refined brine can improve the output and quality of soda ash. In the prior art, the lime-soda ash method is used for refining brine, but the seawater used to prepare refined brine and the original salt contain high calcium and magnesium content, and the large amount of lime milk and soda ash added has a great influence on the salt content of refined brine. Calcium carbonate and magnesium hydroxide generated after the calcium-removing magnesium reaction with large content fluctuations are slow to settle, thus affecting the turbidity of the refined brine. The low salinity of refined brine and fluctuations in turbid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D3/16C01D7/00
CPCC01D3/06C01D3/16C01D7/00C01P2006/80
Inventor 李林飞林克兴马连博刘德利范鹏飞
Owner 山东海天生物化工有限公司
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