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Method for preparing refined brine and its by-products

A technology of refined brine and brine, which is applied in the field of preparing refined brine and its by-products, can solve the problems affecting the concentration of NaCl in refined brine, and achieve the effect of high concentration and good refining effect

Active Publication Date: 2016-08-03
TANGSHAN SANYOU CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, one-step and two-step salt refining processes are commonly used in the refined brine process, but both will affect the NaCl concentration in the refined brine to varying degrees.

Method used

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  • Method for preparing refined brine and its by-products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Under the condition of 20-60°C, use 990L of concentrated seawater to dissolve 265Kg of raw salt in salt tank I to make primary crude brine. The primary crude brine is sent into the reactor Ⅰ, and 50L of milk of lime with a concentration of 180Ti is added to the reactor Ⅰ to make the Mg 2+ , SO 4 2- with OH - , Ca 2+ reaction, and then use clarification tank I to separate the Mg(OH) in the reaction solution under the action of 20g sedimentation aid 2 and CaSO 4 , 65L of the upper clarified liquid is used to dissolve the sedimentation aid, and the rest is sent to the reactor II as primary brine. Na formed by the reaction of 50L hot lye with a concentration of 100Ti and 5L milk of lime with a concentration of 105Ti in the causticizing clarifier 2 CO 3 The solution is sent to the reactor II, and the Ca in the primary brine 2+ reaction, and then use clarification tank II to separate the main components in the reaction liquid as water and ...

Embodiment 2

[0035] Under the condition of 20-60°C, use 1020L of fresh water to dissolve 321Kg of raw salt in salt tank I to make primary coarse brine. The primary crude brine is sent into the reactor Ⅰ, and 30L of milk of lime with a concentration of 180Ti is added to the reactor Ⅰ to make the Mg 2+ , SO 4 2- with OH - , Ca 2+ reaction, and then use clarification tank I to separate the Mg(OH) in the reaction solution under the action of 8g sedimentation aid 2 and CaSO 4 , 30L of the supernatant liquid is used for dissolving aids, and the rest is sent to reactor II as primary brine. The Na formed by the reaction of 30L of 100Ti hot lye with 3L of 180Ti milk of lime 2 CO 3 The solution is sent to the reactor II, and the Ca in the primary brine 2+ reaction, and then use clarification tank II to separate the main components in the reaction liquid as water and CaCO 3 In the secondary mud, 46L is returned to the reactor II to be used as a seed crystal, a...

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Abstract

The invention relates to a method for preparing refined brine and its by-products; the process of three refining, secondary desalting and one-step denitrification comprises the following steps: adding raw salt into a salt tank, and simultaneously adding a certain amount of brine to dissolve the raw salt for denitrification Salt, and then use reactors and clarifiers to carry out three refinements, two times of salt, and one step of denitrification to obtain refined brine. Engineering soil ingredients can be prepared by washing mud three times and mud once. Light calcium carbonate products are produced by washing secondary mud.

Description

technical field [0001] The invention relates to a method for preparing refined brine, in particular to a method for preparing refined brine and its by-products. Background technique [0002] Refined brine is the raw material required in the production process of soda ash by ammonia-soda method. To prepare refined brine, the original salt needs to be dissolved and the Ca in it should be removed. 2+ , Mg 2+ , SO 4 2- . Fresh water or concentrated seawater is needed to dissolve raw salt. Concentrated seawater is rich in NaCl and can be used preferentially. At present, one-step and two-step salt refining processes are commonly used in the process of salt refining refined brine, but both will affect the concentration of NaCl in refined brine to varying degrees. Especially Ca in concentrated seawater 2+ , Mg 2+ , SO 4 2- The content of NaCl in refined brine is significantly higher than that in fresh water, and the influence on the concentration of Na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/16C01F11/18
Inventor 么志义李建渊徐志海冯树红韩立山王秉钧辛兵郭涛张长松胡向成刘正刚刘忠华云玉娥吕晓英毕金柱吴桐
Owner TANGSHAN SANYOU CHEM IND