A comprehensive treatment method for salt mother liquor and salt mud

Abstract

The invention discloses a comprehensive treatment method of salt-producing mother liquid and salt slurry. The method comprises the following steps: adding lime of which the particle diameter is 30-100mesh, and the purity is greater than 60% to an emulsifying pot loaded with the salt-producing mother liquid for emulsifying for 20-40min, wherein the mass ratio of the effective component of calciumoxide to magnesium ions in the salt-producing mother liquid in the lime is (105-110) * purity to 1, pumping emulsified substances into a mother liquid stirring reaction pot, performing sufficient reaction under the stirring condition for 3-5h, and regulating the pH to be greater than 11.4 until the magnesium chloride is completely removed; pumping the reacted slurry to an original reaction pot tobe mixed with original marinating liquid of which the pH is 6.8 to remove iron ions and manganese ions to obtain purify marinating liquid, and then controlling the pH of the purified marinating liquidto be 9.6-10 through complementing alkali liquid; and performing solid-liquid separation on the purified marinating liquid to obtain clear liquid for vacuum evaporation so as to produce salt. The method is notable in magnesium removing effect on the salt-producing mother liquid, low in cost, and thorough in solid-liquid separation, a gypsum pressure filtration system is omitted, and besides, a series of environmental-friendly pressure caused by solid waste on the ground are eliminated.

Description

technical field

[0001] The invention belongs to the technical field of salt production, and in particular relates to a comprehensive treatment method for salt production mother liquor and salt mud. Background technique

[0002] Yulin City is located in the northernmost part of Shaanxi Province, at the junction of the Loess Plateau and the Mu Us Desert. It is a national-level historical and cultural city. Yulin is a national energy and heavy chemical industry base. There are various underground resources such as coal, oil, natural gas, and rock salt. Known as the "Kuwait" of China. Yulin City is rich in salt rock resources, with the characteristics of large area, large reserves and high grade. The proven reserves of salt rock in this area are 885.455 billion tons, and the prospective reserves are 6 trillion tons. Yulin rock salt minerals are mainly massive halite, potassium halite and anhydrite, with a small amount of carnallite and potassium ferric salt. Most of the ore gr...

Examples

Embodiment 1

[0038] Example 1 Experimental Verification

[0039] 1. Working principle and preparation before experiment

[0040] (1) MgCl 2 , Fe, Mn treatment method

[0041] MgCl removal by lime (main component CaO) method 2 , the chemical reaction formula is:

[0042] CaO + H 2 O = Ca(OH) 2 exothermic reaction of digestion

[0043] MgCl 2 + Ca(OH) 2 = Mg(OH) 2 ↓ + CaCl 2 (newborn)

[0044] According to literature search, in order to achieve the purpose of removing magnesium, the pH of the solution must be ≥ 11.3. The actual amount of raw halogen used in production is 530m 3 / h or so, the amount of salt-making mother liquor produced is 70m 3 / h, the amount of salt mother liquor is about 13% of the original brine amount. Detection of MgCl in the original halogen before the experiment 2 The content is about 1.6g / l, and the evaporation enrichment content increases after entering the salt evaporation tank, which is about 2 ten times the content.

[0045] (2) Treatment method ...

Embodiment 2

[0125] Example 2 Industrialized operation

[0126] 1. Operation of lime and magnesium removal

[0127] According to the conclusion of the laboratory simulation experiment, the magnesium removal agent uses lime with a particle size of 30-100 mesh and a purity greater than 70%; firstly, the mother liquor of salt making is pumped into the mother liquor stirring reaction tank through the mother liquor transfer pump, and the magnesium chloride content in the mother liquor is obtained through analysis According to the stoichiometric relationship, an excess of 50% lime is added. The lime is first emulsified by the emulsification tank for 30 minutes, and then pumped into the mother liquor stirring reaction tank through the emulsification pump, and the stirring is started to fully react. After 4 hours, it was detected that magnesium ions were not detected in the slurry in the stirring reaction tank, and the pH was greater than 11.4, and then the treated mother liquor delivery pump was ...

technical field

[0001] The invention belongs to the technical field of salt production, and in particular relates to a comprehensive treatment method for salt production mother liquor and salt mud. Background technique

[0002] Yulin City is located in the northernmost part of Shaanxi Province, at the junction of the Loess Plateau and the Mu Us Desert. It is a national-level historical and cultural city. Yulin is a national energy and heavy chemical industry base. There are various underground resources such as coal, oil, natural gas, and rock salt. Known as the "Kuwait" of China. Yulin City is rich in salt rock resources, with the characteristics of large area, large reserves and high grade. The proven reserves of salt rock in this area are 885.455 billion tons, and the prospective reserves are 6 trillion tons. Yulin rock salt minerals are mainly massive halite, potassium halite and anhydrite, with a small amount of carnallite and potassium ferric salt. Most of the ore gr...

Examples

Embodiment 1

[0038] Example 1 Experimental Verification

[0039] 1. Working principle and preparation before experiment

[0040] (1) MgCl 2 , Fe, Mn treatment method

[0041] MgCl removal by lime (main component CaO) method 2 , the chemical reaction formula is:

[0042] CaO + H 2 O = Ca(OH) 2 exothermic reaction of digestion

[0043] MgCl 2 + Ca(OH) 2 = Mg(OH) 2 ↓ + CaCl 2 (newborn)

[0044] According to literature search, in order to achieve the purpose of removing magnesium, the pH of the solution must be ≥ 11.3. The actual amount of raw halogen used in production is 530m 3 / h or so, the amount of salt-making mother liquor produced is 70m 3 / h, the amount of salt mother liquor is about 13% of the original brine amount. Detection of MgCl in the original halogen before the experiment 2 The content is about 1.6g / l, and the evaporation enrichment content increases after entering the salt evaporation tank, which is about 2 ten times the content.

[0045] (2) Treatment method ...

Embodiment 2

[0125] Example 2 Industrialized operation

[0126] 1. Operation of lime and magnesium removal

[0127] According to the conclusion of the laboratory simulation experiment, the magnesium removal agent uses lime with a particle size of 30-100 mesh and a purity greater than 70%; firstly, the mother liquor of salt making is pumped into the mother liquor stirring reaction tank through the mother liquor transfer pump, and the magnesium chloride content in the mother liquor is obtained through analysis According to the stoichiometric relationship, an excess of 50% lime is added. The lime is first emulsified by the emulsification tank for 30 minutes, and then pumped into the mother liquor stirring reaction tank through the emulsification pump, and the stirring is started to fully react. After 4 hours, it was detected that magnesium ions were not detected in the slurry in the stirring reaction tank, and the pH was greater than 11.4, and then the treated mother liquor delivery pump was ...

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