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Method for preparing highly active α-type hemihydrate gypsum cementitious material by treating phosphogypsum reaction with chlor-alkali waste liquid

A technology of hemihydrate gypsum and cementitious materials, which is applied in the field of waste liquid resource utilization and environmental protection projects, and the production of gypsum cementitious materials. It can solve the problems of low calcium chloride concentration, large steam consumption, environmental pollution, etc., and achieve The effect of saving resources, saving energy consumption, saving investment costs and operating costs

Inactive Publication Date: 2014-10-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method for preparing calcium chloride is to directly evaporate the distillation waste liquid after purification. Due to its low concentration of calcium chloride, the steam consumption is large, a large amount of energy is required, and the cost is high.
Therefore, most enterprises discharge it directly into rivers or seep into the ground, which not only causes environmental pollution, but also wastes resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Calcium hydroxide in the form of milk of lime (250g calcium hydroxide / Kg milk of lime) and chlor-alkali waste liquid are continuously or almost continuously introduced into the reaction device according to the amount of 20Kg milk of lime / t chlor-alkali waste liquid, and are alkalized to remove chlor-alkali waste liquid Inorganic impurities such as magnesium ions and iron ions are precipitated in the waste liquid, and the reactant is in the reaction device for about 30 minutes, and the pH value of the mixed solution is 7.8. At this time, the molar concentration of inorganic ion impurities such as magnesium ions and iron ions in the solution is not Greater than 0.005 mol / L. After the reaction, the solution and products are continuously or almost continuously discharged from the reaction device, and the precipitation temperature is controlled at 65°C; the flocculant anionic polyacrylamide flocculant CAFFARO is added to the solution coming out of the reaction device, and the...

Embodiment 2

[0026] Calcium hydroxide in the form of milk of lime (250g calcium hydroxide / Kg milk of lime) and chlor-alkali waste liquid are continuously or almost continuously introduced into the reaction device according to the amount of 20Kg milk of lime / t chlor-alkali waste liquid, and are alkalized to remove chlor-alkali waste liquid Inorganic impurities such as magnesium ions and iron ions are precipitated in the waste liquid, and the reactants are in the reaction device for about 30 minutes, and the pH value of the mixed solution is 8.3. At this time, the molar concentration of inorganic ion impurities such as magnesium ions and iron ions in the solution is not Greater than 0.005 mol / L. After the reaction, the solution and products are continuously or almost continuously discharged from the reaction device, and the precipitation temperature is controlled at 60°C; the flocculant anionic polyacrylamide flocculant CAFFARO is added to the solution coming out of the reaction device, and t...

Embodiment 3

[0028]Calcium hydroxide in the form of milk of lime (250g calcium hydroxide / Kg milk of lime) and chlor-alkali waste liquid are continuously or almost continuously introduced into the reaction device according to the amount of 40Kg milk of lime / t chlor-alkali waste liquid, and alkalization is carried out to remove the chlor-alkali waste liquid Inorganic impurities such as magnesium ions and iron ions are precipitated in the waste liquid, and the reactant is in the reaction device for about 30 minutes, and the pH value of the mixed solution is 8.5. At this time, the molar concentration of inorganic ion impurities such as magnesium ions and iron ions in the solution is not Greater than 0.005 mol / L. After the reaction, the solution and products are continuously or almost continuously discharged from the reaction device, and the precipitation temperature is controlled at 45°C; the flocculant anionic polyacrylamide flocculant CAFFARO is added to the solution coming out of the reactio...

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Abstract

The invention relates to a method for preparing highly active α-type hemihydrate gypsum gelling material by using chlor-alkali waste liquid to treat phosphogypsum reaction, including the following process steps: 1) adding a precipitant to the chlor-alkali waste liquid to remove part of ion impurities; 2) sedimentation, Filtration process; 3) Concentration process of calcium chloride solution; 4) Preparation process of highly active hemihydrate gypsum gelling material by atmospheric pressure hydrothermal reaction. The beneficial effect of the present invention is: solve two big wastes at the same time, environmental protection, save resources; waste liquid does not need to be prepared into crystals but can be used after being concentrated to 15-45% concentration after treatment, eliminating the need to prepare calcium chloride crystals The intermediate process saves energy consumption; after the reaction, the waste liquid can be recycled after treatment; it is suitable for the large-scale treatment of chlor-alkali waste liquid and phosphogypsum, the industrial waste of phosphating, and also serves as an industrialized production of resource recovery.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of waste liquid and environmental protection engineering, relates to the technical field of producing gypsum cementitious material with phosphogypsum as raw material, and in particular relates to a low-cost and low-energy-consumption method for treating solid waste phosphogypsum with chlor-alkali waste liquid 1. A green and environment-friendly method for preparing α-type highly active hemihydrate gypsum cementitious material. Background technique [0002] Chlor-alkali waste liquid is the industrial waste water produced in the process of preparing certain chlor-alkali chemical products. This patent especially refers to the waste liquid produced in the process of preparing soda ash by the ammonia-alkali method. my country is the world's largest producer of soda ash, and has implemented three production methods, the ammonia-soda method, the combined soda method and the trona method, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
Inventor 马保国卢斯文蹇守卫茹晓红付浩兵邹开波李玉博郅真真
Owner WUHAN UNIV OF TECH
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