Method for preparing low calcium and magnesium refined salt by downhole denitration process

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

Active Publication Date: 2015-12-09
江苏苏盐井神股份有限公司 +1
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  • Claims
  • Application Information

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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 mine. Medium brine returns to turbidity, high purification costs, and large equipment investment. At the same time, the salt-making mother liquor is reinjected into the mine for denitrification, which reduces the discharge of the salt-making mother liquor and the Mg in the mother liquor. 2+ content, reducing production energy consumption and saving production costs

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  • Method for preparing low calcium and magnesium refined salt by downhole denitration process

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Embodiment 1

[0048] A method for preparing low-calcium magnesium refined industrial salt by using the downhole denitrification process: such as figure 1 As shown, the alkali-making calcium solution (CaCl 2 110g / l, pH 13) Add appropriate amount of fresh water, control the blending ratio to 1:11, that is, mix 1 part of alkali-making calcium solution with 11 parts of fresh water (the pH of the mixed solution is about 12), and inject it into the underground of the salt mine. Dissolve rock salt in the mine, and after 3 days of settlement, the NaCl content is 290-300g / l, and the NaCl content is 290-300g / l. 2 SO 4 Content 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% alkali-making hot lye to adjust the pH to 9, and react with calcium sulfate in the low-nitrate brine After the calcium ion content in the detected brine is lower than 5mg / l, it is transferred to the inclined tube sedimentation tank, ...

Embodiment 2

[0051] A method for preparing low-calcium magnesium refined industrial salt by using the downhole denitrification process: such as figure 1 As shown, the alkali-making calcium solution (CaCl 2 110g / l, pH 12) Add a certain amount of fresh water, control the blending ratio to 1:18.2, that is, mix 1 part of alkali-making calcium solution with 18.2 parts of fresh water (the pH of the mixed solution is about 11), and inject it into the underground of the salt mine , Dissolve rock salt in the mine, and after 5 days of settlement, the NaCl content is 295-305g / l, and the NaCl content is 295-305g / l.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% alkali-making hot lye to adjust the pH to 9.5, and react with calcium sulfate in the low-nitrate brine After detecting that the calcium ion content in the brine is lower than 4mg / l, it is transferred to the inclined tube sedimentation tan...

Embodiment 3

[0053] A method for preparing low-calcium magnesium refined industrial salt by using the downhole denitrification process: such as figure 1 As shown, the alkali-making calcium solution (CaCl 2 120g / l, pH 13) Add a certain amount of fresh water, and control the blending ratio to 1:9.3, that is, mix 1 part of alkali-making calcium solution with 9.3 parts of fresh water (the pH of the mixed solution is about 12), and then inject it into the underground of the salt mine , Dissolve rock salt in the mine, and after 4 days of settlement, the NaCl content is 300-310g / l, and the NaCl content is 300-310g / l. 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% alkali-making hot lye to adjust the pH to 10.5, and react with calcium sulfate in the low-nitrate brine After detecting that the calcium ion content in the brine is lower than 3.5mg / l, it is transferred to the inclined tube sedime...

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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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Patent Type & Authority Patents(China)
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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