Method for desalting calcium magnesium slime by two-step process

A calcium-magnesium mud and desalination technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, sludge treatment, etc., can solve problems such as reducing the area of ​​rock salt exposure, the risk of brine mining production, and reducing the concentration of brine produced. Achieve the effect of less investment in equipment, short construction period and simple process

Inactive Publication Date: 2012-10-17
HENAN JINDADI CHEM IND CO LTD
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Problems solved by technology

After waste slag injection, gypsum, CaCO 3 Substances such as these adhere to the rock salt wall, reduce the exposed area of ​​rock salt, and reduce the rate of salt dissolution, thereby reducing the concentration of bri

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  • Method for desalting calcium magnesium slime by two-step process

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Embodiment 1

[0026] A method for desalination of two-step calcium magnesium mud, it comprises the following steps:

[0027] The first step, the first-grade calcium magnesium mud desalination, it includes the following steps:

[0028] A: Gypsum and Mg(OH) produced by the primary reaction of brine purification 2 After the waste residue is transported to the washing tank by the mud pump, the supernatant is put into the brine tank after clarification, and then the brine is pumped to the primary reaction tank to participate in the purification reaction, and the remaining gypsum slurry is pumped by the mud pump to the open flow filter press Carry out one-level pressure filtration, and the filtrate after pressure filtration is sent to the first-level reaction tank by centrifugal pump to participate in the purification reaction. The water content of the salt-containing gypsum filter cake after pressure filtration is 25-30%, and the salt content is 10-16%;

[0029] B: Put the salt-containing g...

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Abstract

The invention relates to a method for desalting calcium magnesium slime by a two-step process, which aims to solve the problem of calcium magnesium slime generated in the brine purification process. The invention adopts the two-step process, fully considers different physicochemical properties of CaSO4, Ca(OH)2, Mg(OH)2 and CaCO3, and changes high-salt-content high-water-content waste calcium magnesium slime into valuable substances by carrying out precipitation, dehydration, desalting by washing, dehydration and the like on gypsum and magnesium slime generated by brine purification first-order reaction and saliferous calcium carbonate slime generated by second-order reaction, so that the salt content of the calcium magnesium slime can be less than 0.5% or lower, and the water content is lower than 15%. The saliferous gypsum generated by first-order reaction can be sold to a cement plant as a cement retarder after desalting, and can also be used as an additive for making a brick, thereby changing waste residues into valuable substances. The CaCO3 waste residues of the second-order reaction have wider application prospects after desalting due to high content.

Description

technical field [0001] The invention belongs to the technical field of treatment and comprehensive utilization of inorganic chemical wastes, in particular to a two-step method for desalination of calcium-magnesium mud. Background technique [0002] As an industrial raw material, brine can be used comprehensively to obtain chemical products such as table salt, Glauber's salt, potassium chloride, magnesium sulfate, anhydrous Glauber's salt, barium chloride, borax, boric acid, soda ash, lithium carbonate, bromine, and iodine. Remove main components NaCl and Na from raw brine 2 SO 4 In addition, there is Ca 2 SO 4 , MgSO 4 and other impurities. Unpurified raw brine is directly used for salt production and nitrate extraction, and there is CaSO in the process of preheating and evaporation 4 , Ca(CO 3 ) 2 , Mg(OH) 2 Insoluble impurities such as insoluble impurities are formed, which are attached to the pipe wall to form scaling, which affects the heat transfer effect of t...

Claims

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Application Information

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IPC IPC(8): C01F11/46C01F11/18C02F11/00
Inventor 胡忠杰
Owner HENAN JINDADI CHEM IND CO LTD
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