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A method for co-producing α-ultra-high-strength gypsum and sodium chloride and ultra-high-strength gypsum

An ultra-high-strength, sodium chloride technology, applied in chemical instruments and methods, alkali metal chlorides, inorganic chemistry, etc., can solve the problems of high investment and production costs, limit industrial production, reduce economic benefits, etc., and achieve low production costs , Reduce capital investment, low equipment investment effect

Active Publication Date: 2021-10-01
山东海天生物化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for the co-production of α-ultra-high-strength gypsum and sodium chloride by the normal-pressure salt solution method, aiming to solve the problem of high phase inversion temperature and phase inversion in the production method of ultra-high-strength α-hemihydrate gypsum in the prior art. High pressure and reliance on special reactors lead to high energy consumption, investment and production costs, which reduces its economic benefits and limits its industrial production

Method used

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  • A method for co-producing α-ultra-high-strength gypsum and sodium chloride and ultra-high-strength gypsum
  • A method for co-producing α-ultra-high-strength gypsum and sodium chloride and ultra-high-strength gypsum
  • A method for co-producing α-ultra-high-strength gypsum and sodium chloride and ultra-high-strength gypsum

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Embodiment 1

[0045] A kind of atmospheric pressure saline solution method of the present invention co-produces the method for α-ultra-high-strength gypsum and sodium chloride comprising the following steps:

[0046] 1) Get the calcium chloride waste liquid that soda ash plant produces and the sodium sulfate solid of white carbon black industrial by-product, mix, the concentration of calcium chloride in the calcium chloride waste liquid is 0.7mol / L, the chlorine in the calcium chloride waste liquid The mass ratio of calcium chloride to sodium sulfate in solid sodium sulfate is 0.5:1, react for 1 hour at 40°C and a stirring speed of 70 r / min, and settle for 5 hours to obtain a dihydrate gypsum slurry;

[0047]2) Separating the dihydrate gypsum slurry obtained in step 1) from solid to liquid to obtain a dihydrate gypsum crude product and a filtrate, the dihydrate gypsum crude product being plate-shaped dihydrate gypsum, washing the obtained dihydrate gypsum crude product to obtain dihydrate gy...

Embodiment 2

[0051] A kind of atmospheric pressure saline solution method of the present invention co-produces the method for α-ultra-high-strength gypsum and sodium chloride comprising the following steps:

[0052] 1) Get the calcium chloride waste liquid that soda ash plant produces and the sodium sulfate solid of white carbon black industrial by-product and add respectively in the reaction crystallization kettle, mix, the concentration of calcium chloride in the calcium chloride waste liquid is 1.0mol / L, The substance ratio of calcium chloride in the calcium chloride waste liquid to sodium sulfate in the sodium sulfate solid is 1:1, react for 5 hours at 60°C and a stirring rate of 100 r / min, and settle for 20 hours to obtain a dihydrate gypsum slurry;

[0053] 2) Separating the dihydrate gypsum slurry obtained in step 1) from solid to liquid to obtain a dihydrate gypsum crude product and a filtrate, the dihydrate gypsum crude product being plate-shaped dihydrate gypsum, washing the obtai...

Embodiment 3

[0057] A kind of atmospheric pressure saline solution method of the present invention co-produces the method for α-ultra-high-strength gypsum and sodium chloride comprising the following steps:

[0058] 1) Take the calcium chloride waste liquid produced by the ammonia-soda method soda ash plant and the sodium sulfate solid produced by the white carbon black industry and add them to the reaction crystallization kettle respectively, mix, and the concentration of calcium chloride in the calcium chloride waste liquid is 0.8mol / L, the mass ratio of calcium chloride in calcium chloride waste liquid to sodium sulfate in sodium sulfate solid is 1:1.2, at 50°C and a stirring speed of 80r / min, react for 3h, settle for 10h, and get dihydrate gypsum slurry;

[0059] 2) Separating the dihydrate gypsum slurry obtained in step 1) from solid to liquid to obtain a dihydrate gypsum crude product and a filtrate, the dihydrate gypsum crude product being plate-shaped dihydrate gypsum, washing the...

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Abstract

The present invention proposes a method for co-producing α-ultra-high-strength gypsum and sodium chloride by normal-pressure salt solution method and the obtained α-ultra-high-strength gypsum and sodium chloride. The invention comprises the following steps: 1) using calcium chloride waste liquid from a soda ash factory and sodium sulfate solid produced by white carbon black industry as raw materials, reacting and settling to obtain dihydrate gypsum slurry; 2) separating solid and liquid, washing to obtain Dihydrate gypsum, the filtrate is sent to the soda ash plant to obtain sodium chloride; 3) get the salt solution and phase inversion additive to mix to make a phase inversion mixed solution, add it to the dihydrate gypsum, and react to obtain α-hemihydrate gypsum slurry; 4) Solid-liquid separation, washing, and drying to obtain α-hemihydrate gypsum. The invention not only solves the problem of environmental protection, but also produces sodium chloride products and high-value α-ultra-high-strength gypsum, turning waste into treasure; the method is normal pressure, less investment, low cost, and is suitable for large-scale production; the obtained α- The finished ultra-high-strength gypsum meets the requirements of national standards and industry standards, with high whiteness and high dry compressive strength.

Description

technical field [0001] The invention relates to the technical field of industrial waste water reuse, in particular to a method for co-producing α-ultra-high-strength gypsum and sodium chloride by normal-pressure salt solution method and the obtained α-ultra-high-strength gypsum and sodium chloride. Background technique [0002] Industrially, the Solvay process is used to produce soda ash. The raw materials are raw salt and limestone. In order to recycle the ammonia gas, slaked lime is used to decompose the ammonium chloride mother liquor. Therefore, a large amount of calcium chloride waste liquid is produced. The main components of this calcium chloride waste liquid include 12%wt CaCl 2 And the NaCl of 5%wt, produce 1 ton of soda ash approximately Produce 10m3 waste liquid, the discharge of waste liquid not only wastes resources, and pollutes the environment. Sodium chloride and calcium chloride in waste liquid are valuable compounds, how to separate them for reuse has alwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/46C01D3/04
CPCC01D3/04C01F11/46C01F11/466
Inventor 韩素英李志宝李佳佳孙倩
Owner 山东海天生物化工有限公司
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