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.
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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...
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[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...
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[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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