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...

AI Technical Summary

Problems solved by technology

[0008] (1) The gypsum produced by the system is difficult to be transported out due to its high water content, and it is piled up in the factory area, which puts a huge pressure on environmental protection. In addition, the cost of dry base treatment is also relatively expensive;

[0009] (2) The enrichment of magnesium chloride in the system leads to an increase in the boiling point of the feed liquid, and magnesium chloride will be hydrolyzed at a certain temperature and pressure, causing corrosion and endangering the evaporation equipment;

[0010] (3) The centrifugation and filter press devices of salt making mother liquor have a high failure rate and high maintenance costs;

[0011] (4) The cost of removing magnesium with sodium hydroxide in the mother liquor is high, and the precipitation is slow. The centrifuge liquid contains a large amount of gypsum and magnesium hydroxide solid phase, and returns to the salt system to form a vicious circle.

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