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Preparation method for preparing alpha-type high-strength gypsum by self-steam-curing method

A technology for high-strength gypsum and phosphogypsum, which is applied in the field of preparing α-type high-strength gypsum by auto-curing method, can solve the problems of inability to meet the requirements of environmental protection production industrialization, complicated process and high cost, and achieves superior cost performance, simple operation and high water consumption. small effect

Pending Publication Date: 2021-03-12
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the development of these two production processes is relatively mature, large-scale equipment is required to meet the pressurized conditions in the production process. Not only is the process complicated, the cost is high, and the energy consumption is high, it can no longer meet the current industrialization requirements of environmental protection production.

Method used

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  • Preparation method for preparing alpha-type high-strength gypsum by self-steam-curing method

Examples

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Effect test

Embodiment 1

[0030] A method for preparing high-strength gypsum by utilizing phosphogypsum, comprising the following steps: 1) Pretreatment of phosphogypsum: take an appropriate amount of phosphogypsum, add tap water and wash 13 times for pretreatment according to the water-to-paste ratio of 1:2.5, so that the pH value is neutral 2) preparation of phosphogypsum slurry: take by weighing polycarboxylate (sodium citrate) at 0.08% by phosphogypsum mass ratio, stir the crystal modifier and water in a beaker to make the crystal modifier completely dissolved in water, then Pour the mixed solution into the pretreated phosphogypsum and stir to prepare a thick paste. The solid-to-water ratio of phosphogypsum and the mixed solution is 3:1; 3) steam curing treatment: put the prepared slurry into an aluminum box and seal it . Steam curing in an oven at normal pressure and temperature of 140°C, constant temperature for 10h; 4) Drying and grinding of autoclaved materials: drying the steamed materials at ...

Embodiment 2

[0032] A method for preparing high-strength gypsum by utilizing phosphogypsum, comprising the following steps: 1) Pretreatment of phosphogypsum: take an appropriate amount of phosphogypsum, add tap water and wash 13 times for pretreatment according to the water-to-paste ratio of 1:2.5, so that the pH value is neutral 2) preparation of phosphogypsum slurry: take by weighing polycarboxylate (sodium citrate) at 0.08% by phosphogypsum mass ratio, stir the crystal modifier and water in a beaker to make the crystal modifier completely dissolved in water, then Pour the mixed solution into the pretreated phosphogypsum and stir to prepare a thick paste. The solid-to-water ratio of phosphogypsum and the mixed solution is 3:1; 3) steam curing treatment: put the prepared slurry into an aluminum box and seal it . Steam curing in an oven at normal pressure and temperature of 140°C, constant temperature for 6 hours; 4) Drying and grinding of autoclaved materials: drying the steamed materials...

Embodiment 3

[0034] A method for preparing high-strength gypsum by utilizing phosphogypsum, comprising the following steps: 1) Pretreatment of phosphogypsum: take an appropriate amount of phosphogypsum, add tap water and wash 13 times for pretreatment according to the water-to-paste ratio of 1:2.5, so that the pH value is neutral 2) preparation of phosphogypsum slurry: take by weighing polycarboxylate (sodium citrate) at 0.08% by phosphogypsum mass ratio, stir the crystal modifier and water in a beaker to make the crystal modifier completely dissolved in water, then Pour the mixed solution into the pretreated phosphogypsum and stir to prepare a thick paste. The solid-to-water ratio of phosphogypsum and the mixed solution is 3:1; 3) steam curing treatment: put the prepared slurry into an aluminum box and seal it . Steam curing in an oven at normal pressure and temperature of 140°C, constant temperature for 4 hours; 4) Drying and grinding of autoclaved materials: drying the steamed materials...

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Abstract

The invention provides a preparation method of alpha-type high-strength gypsum by a self-steam-curing method, which comprises the following steps: 1) phosphogypsum pretreatment: kind 1, taking a proper amount of phosphogypsum, adding a proper proportion of tap water, cleaning, washing with water, and carrying out pretreatment until the pH value is 7; kind 2, taking a proper amount of phosphogypsum, adding a certain proportion of quick lime for aging treatment; kind 3, taking a proper amount of phosphogypsum, adding a certain proportion of magnesium hydrate for aging treatment; 2) preparation of phosphogypsum slurry: mixing water with different proportions and a proper amount of a crystal modifier to prepare phosphogypsum slurry with a proper water content; 3) steam curing treatment: putting the prepared phosphogypsum slurry into an aluminum box to be sealed and subjecting to steam curing for a certain period of time under the normal pressure condition and at the proper temperature; 4),drying and grinding of steam-cured materials : specifically, uncovering the closed aluminum box obtained after steam curing, drying and grinding to obtain the high-strength gypsum; large-scale steampressing equipment is not needed, cost is saved, and resource utilization of phosphogypsum is developed.

Description

technical field [0001] The invention relates to a gypsum material and a preparation method thereof, in particular to a method for preparing α-type high-strength gypsum by a self-steaming method. Background technique [0002] Phosphogypsum is mainly an industrial by-product obtained from the wet production of phosphoric acid by phosphorus chemical enterprises. For every 1 ton of phosphoric acid produced, about 4.5 to 5.5 tons of phosphogypsum are discharged. With the increase of phosphate fertilizer production, the stockpiling of phosphogypsum is increasing day by day, which not only occupies a large amount of land, increases costs, wastes resources, but also causes serious environmental pollution. Phosphogypsum can be used to prepare α- and β-type hemihydrate under different conditions, but β-type hemihydrate has low strength and poor fluidity. Compared with β-type hemihydrate, its products have high strength, light weight, Heat insulation, fire prevention, no pollution, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B11/024C04B11/032C04B11/036
CPCC04B11/26C04B11/005C04B11/007C04B11/036C04B11/024C04B11/032
Inventor 徐港赵帅我冬梅南聪
Owner CHINA THREE GORGES UNIV
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