Method for preparing alpha semi-hydrated gypsum at low cost and prepared alpha semi-hydrated gypsum and gypsum block

A low-cost technology of hemihydrate gypsum, applied in gypsum building materials, low-cost preparation of α-type hemihydrate gypsum, α-type hemihydrate gypsum and gypsum blocks, can solve the problems of difficult adaptation, low compressive strength, gypsum masonry To solve the problems of poor mechanical properties of blocks, to achieve the effect of wide application, high compressive strength and good performance

Inactive Publication Date: 2014-01-15
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gypsum blocks made by these two technologies use β-type hemihydrate gypsum as the cementitious material. Due to the existence of impurity components, the mechanical properties of the gypsum blocks are not good, and the compressive strength is relatively low, generally only up to 4.5- 7.5MPa, it is difficult to meet the requirements of modern buildings for gypsum block materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 5kg of phosphogypsum and add 5g of citric acid solution with a concentration of 40wt%, stir, wash, and dehydrate to obtain a phosphogypsum slurry with a soluble phosphorus content of not more than 0.6wt%, a soluble fluorine content of not more than 0.4wt%, organic matter The content is not more than 0.3wt%; Weigh 16.4kg of 29wt% waste hydrochloric acid, add 5g of aluminum chloride, and stir evenly and slowly until the molar concentration of iron and magnesium in the solution is not more than 0.005mol / L to obtain a purified hydrochloric acid solution; take 6kg Calcium carbide mud (with a moisture content of 40wt% and a calcium hydroxide content of 85wt%) was added to 3.6g of 30wt% sodium carbonate solution (0.1wt%), washed and dehydrated to obtain calcium carbide mud slurry, and its soluble phosphorus content was not greater than 0.6 wt%, the organic matter content is not more than 0.3wt%; the above-mentioned calcium carbide slurry is added in the above-mentioned pu...

Embodiment 2

[0026] Weigh 5kg of phosphogypsum and add 25g of lime (containing calcium oxide 80wt%), stir evenly, age for 24 hours, stir, wash, and dehydrate to obtain phosphogypsum slurry, whose soluble phosphorus content is not more than 0.6wt%, soluble fluorine content Not more than 0.4wt%, organic content not more than 0.3wt%; Weigh 15.0kg of 32wt% waste hydrochloric acid, add 4.5g aluminum chloride, stir evenly and slowly, until the molar concentration of iron and magnesium in the solution is not more than 0.005mol / L, Obtain a purified hydrochloric acid solution; take 6kg of calcium carbide mud (its moisture content is 40wt%, calcium hydroxide content is 85wt%), add 2.8g35wt% sodium carbonate solution (0.08wt%), wash and dehydrate to obtain calcium carbide mud slurry, Its soluble phosphorus content is not more than 0.6wt%, and the organic matter content is not more than 0.3wt%. Active agent solution: Add the above-mentioned phosphogypsum slurry to the above-mentioned active agent solu...

Embodiment 3

[0029] Weigh 5kg of phosphogypsum and add 25g of lime (containing calcium oxide 80wt%), stir evenly, age for 24 hours, stir, wash, and dehydrate to obtain phosphogypsum slurry, whose soluble phosphorus content is not more than 0.6wt%, soluble fluorine content Not more than 0.4wt%, organic matter content not more than 0.3wt%; Weigh 18kg of 26wt% waste hydrochloric acid, add 5.5g aluminum chloride, stir evenly and slowly, until the molar concentration of iron and magnesium in the solution is not more than 0.005mol / L, obtain Purified hydrochloric acid solution; get 6kg calcium carbide mud (its moisture content is 40wt%, calcium hydroxide content is 85wt%), add 1.8g45wt% sodium carbonate solution (0.05wt%), obtain calcium carbide mud slurry through washing, dehydration, its The content of soluble phosphorus is not more than 0.6wt%, and the content of organic matter is not more than 0.3wt%. Add the above phosphogypsum slurry to the above active agent solution, add 1g of EDTA, and u...

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Abstract

The invention provides a method for preparing alpha semi-hydrated gypsum at low cost. The method comprises the following steps: (1) pretreating ardealite; (2) pretreating a waste hydrochloric acid solution; (3) pretreating calcium carbide mud; (4) preparing an activity agent; and (5) preparing the alpha semi-hydrated gypsum through a normal pressure hydrothermal method. According to the method, three industrial wastes are used as main raw materials, the alpha semi-hydrated gypsum is prepared by adopting a simple process, emission of hazardous wastes is reduced, the industrial wastes are recycled, and the prepared alpha semi-hydrated gypsum is good in performance and low in cost and can be widely applied to the construction industry.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a gypsum building material, and more specifically, to a low-cost method for preparing α-type hemihydrate gypsum and the prepared α-type hemihydrate gypsum and gypsum blocks. Background technique [0002] Phosphogypsum is a solid waste with calcium sulfate as the main component discharged from the wet process of phosphoric acid production. It often exists in the form of calcium sulfate dihydrate, and about 4.5-5.5 tons of phosphogypsum is discharged per ton of P2O5 produced. According to statistics, in 2011, the discharge of phosphogypsum in my country was close to 70 million tons, and the cumulative stacking volume has exceeded 300 million tons, while the utilization rate is less than 20%. Solid waste not only occupies a large amount of land and wastes resources, but also causes serious pollution to the surrounding air, soil, vegetation and water systems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 马保国李玉博卢斯文郅真真苏英蹇守卫
Owner WUHAN UNIV OF TECH
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