Method for preparing refined salt low in calcium and magnesium by utilizing underground denitration process

A denitration and process technology, applied in the direction of alkali metal chlorides, etc., can solve the problems of reducing the discharge of salt-making mother liquor, large equipment investment, and high purification cost, and achieve the effect of solving the effect of brine returning to turbidity, low content and low raw material cost.

Active Publication Date: 2014-08-13
江苏苏盐井神股份有限公司 +1
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AI Technical Summary

Problems solved by technology

[0017] This process makes full use of the characteristics of the strong alkalinity of the soda-making calcium solution, the huge underground cavity of the salt mine, and the large amount of sodium carbonate in the soda-making hot lye, and solves the traditional purification process by first removing sulfate and magnesium in the mine and then removing calcium in the

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  • Method for preparing refined salt low in calcium and magnesium by utilizing underground denitration process

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[0047] Example 1

[0048] A method for preparing low-calcium and magnesium refined industrial salt using downhole denitration technology: figure 1 As shown, the calcium solution for alkali making (CaCl 2 110g / l, pH 13) Add appropriate amount of fresh water, control the mixing ratio to 1:11, that is, 1 part of alkali-making calcium solution is mixed with 11 parts of fresh water (the pH of the mixture is about 12), and then injected into the salt mine. Dissolve rock salt in the mine. After 3 days of settlement, the NaCl content of 290-300g / l is mined. Na 2 SO 4 The content is about 10g / l, CaSO 4 Low nitrate brine with a content of 2.5-2.7g / l; transport the mined low nitrate brine to the inclined plate settler, add 18% of the hot lye to adjust the pH to 9, and react with calcium sulfate in the low nitrate brine When the calcium ion content in the brine is lower than 5mg / l, it is transferred to the inclined tube sedimentation tank, and a certain amount (2g / m 3 Brine) coagulant aid (c...

Example Embodiment

[0050] Example 2

[0051] A method for preparing low-calcium and magnesium refined industrial salt using downhole denitration technology: figure 1 As shown, the calcium solution for alkali making (CaCl 2 110g / l, pH 12) Add a certain amount of fresh water, control the mixing ratio to 1: 18.2, that is, 1 part of alkali-making calcium solution is mixed with 18.2 parts of fresh water (the pH of the mixture is about 11), and then injected into the salt mine. , Dissolve rock salt in the mine. After 5 days of settlement, the NaCl content is 295-305g / l, Na 2 SO 4 Content 15g / l, CaSO 4 Low nitrate brine with a content of 1.8—2.0g / l; transport the mined low nitrate brine to the inclined plate settler, add 20% of the hot lye to adjust the pH to 9.5, and react with calcium sulfate in the low nitrate brine When the calcium ion content in the brine is lower than 4mg / l, it is transferred to the inclined tube sedimentation tank, and a certain amount (2g / m 3 Brine) coagulant aid (coagulant aid so...

Example Embodiment

[0052] Example 3

[0053] A method for preparing low-calcium and magnesium refined industrial salt using downhole denitration technology: figure 1 As shown, the calcium solution for alkali making (CaCl 2 120g / l, pH 13) Add a certain amount of fresh water, control the mixing ratio to 1:9.3, that is, 1 part of alkali-making calcium solution is mixed with 9.3 parts of fresh water (the pH of the mixture is about 12), and then injected into the salt mine. , Dissolve rock salt in the mine, and mine NaCl content of 300-310g / l after 4 days of settlement, Na 2 SO 4 Content 7g / l, CaSO 4 Low nitrate brine with a content of 2.6—2.8g / l; transport the mined low nitrate brine to the inclined plate settler, add 22% of the hot lye for alkali making to adjust the pH to 10.5, and react with calcium sulfate in the low nitrate brine When the calcium ion content in the brine is less than 3.5mg / l, it is transferred to the inclined tube sedimentation tank, and a certain amount (3g / m 3 Brine) coagulant a...

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Abstract

The invention discloses a method for preparing refined industrial salt low in calcium and magnesium by utilizing an underground denitration process. The method disclosed by the invention comprises the following steps: (1), injecting alkali production calcium liquid in a well and extracting brine; (2), underground removing sulfate radicals and magnesium; (3), surfacely removing calcium; (4), producing salt in vacuum; and (5), returning salt production mother liquid in the well and denitrating. The content of calcium and magnesium in industrial salt produced by the method disclosed by the invention is less than or equal to 0.05%, and therefore, the content of calcium and magnesium is far less than that in industrial salt produced by the traditional methods.

Description

technical field [0001] The invention belongs to the field of salt products, in particular to a method for preparing low-calcium and magnesium refined industrial salt by using an underground denitrification process. Background technique [0002] According to the raw material source of salt, salt is mainly divided into sea salt and mine salt. In recent years, due to the requisition of a large amount of sea salt tidal flat resources, sea salt production has been shrinking, while well mine salt has developed rapidly with the continuous discovery of rock salt resources, and the proportion of well mine salt to the total salt production in the country has continued to rise, exceeding 50%. my country is rich in mine salt resources, mainly distributed in Sichuan, Yunnan, Hubei, Hunan, Jiangxi, Jiangsu and other provinces. The Huai'an area is the main mine salt production area in Jiangsu Province. There are abundant underground rock salt reserves, and the rock salt belongs to sodium ...

Claims

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Application Information

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IPC IPC(8): C01D3/08
Inventor 蒋海斌张文广刘正友黄承张顺达艾红贺向前
Owner 江苏苏盐井神股份有限公司
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