Ardealite-based lightweight plastering gypsum and preparation method thereof

A technology of plastering gypsum and phosphogypsum, which is applied in the field of building materials, can solve problems such as adverse environmental effects, affecting product appearance and performance, and achieve the effects of low shrinkage, low hollowing, good water retention and workability

Active Publication Date: 2021-06-11
武汉三源特种建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dihydrate gypsum in its raw material is untreated desulfurization gypsum and phosphogypsum and other industrial waste residues. There are many impurities in these industrial waste residues, which will not only affect the appearance and performance of the product, especially phosphogypsum also contains some harmful impurities. , direct use may also have adverse effects on the environment

Method used

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  • Ardealite-based lightweight plastering gypsum and preparation method thereof
  • Ardealite-based lightweight plastering gypsum and preparation method thereof

Examples

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preparation example Construction

[0033] The phosphogypsum-based light-weight plastering gypsum provided in the embodiments, in terms of mass percentage, raw materials include: calcined phosphogypsum and alum 50-60%, cement 5-10%, heavy calcium 20-35%, vitrified microbeads 8 -10%, 0.2-0.25% cellulose, 0.2-0.5% coupling agent, 0.04-0.05% viscosifier, 0.01-0.05% retarder. The calcined phosphogypsum and alum are formed by mixing and calcining alunite raw ore and phosphogypsum, and the preparation method includes the following steps:

[0034] S1. First mix the cellulose, coupling agent and water in a certain proportion, stir and heat to 70-90°C under the condition of 200-400rpm, keep it warm for 15-45min, and then cool to room temperature to obtain solution a;

[0035] S2. Add the solution a to the low-alkali solution whose pH of the retarder is 8-9, and stir at a speed of 200-400 rpm for 10-30 minutes at room temperature to prepare the solution b;

[0036] S3. Add solution b and tackifier to an appropriate amoun...

Embodiment 1

[0038] A phosphogypsum-based lightweight plastering gypsum, including the following raw materials: 550 kg of calcined phosphogypsum and alum, 62 kg of cement, 300 kg of heavy calcium, 80 kg of vitrified microbeads, 2 kg of cellulose, 5 kg of coupling agent, and 0.5 kg of viscosifying agent kg, retarder 0.5kg. Among them, the mass ratio of alunite:phosphogypsum is 1:100, and the calcination condition is 600°C for 1 hour. The preparation process is as follows:

[0039] (1) First mix the cellulose, coupling agent and water at a mass ratio of 2:5:93, stir and heat to 70°C under the condition of 200rpm, keep it warm for 30min, and then cool to room temperature to obtain solution a;

[0040] (2) Add solution a to a low-alkali solution of 5 wt% bone collagen retarder, and stir at a speed of 200 rpm for 15 minutes at room temperature to obtain solution b; the pH of the low-alkali solution is 8;

[0041] (3) Add solution b and tackifier to an appropriate amount of water, then mix the ...

Embodiment 2

[0043] This example is basically the same as Example 1, except that the composition of lightweight plastering gypsum is: 550kg of calcined phosphogypsum and alum, 50kg of cement, 300kg of heavy calcium, 92kg of vitrified microbeads, 2.5kg of cellulose, and a coupling agent 5kg, viscosifier 0.4kg, retarder 0.1kg; The cellulose described in step S1, coupling agent and water are mixed by mass ratio 2.5:5:92.5; The low alkali solution in S2 contains 1wt% collagen protein retardation Agent; Other preparation process of plastering gypsum is with embodiment 1.

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Abstract

The invention provides ardealite-based lightweight plastering gypsum and a preparation method thereof, and the plastering gypsum comprises the following raw materials by mass: 30.1- 70.5% of calcined ardealite and alum, 4.5-15.5% of cement, 14.5-45.5% of ground calcium carbonate, 4.5-12.5% of vitrified microbeads, 0.01-1.0% of cellulose, 0.1-2.0% of a coupling agent, 0.01-1.0% of a tackifier, and 0.01-1.5% of a retarder. The calcined ardealite and the alum are formed by mixing and calcining alunite raw ore and ardealite. The semi-hydrated-anhydrite mixed-phase gypsum cementing material prepared through calcination can utilize the hydration characteristics of two gypsum phases, fully exerts the advantages of the two gypsum phases, provides a new way for large-scale utilization of phosphogypsum, and has good environmental and economic benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a phosphogypsum-based lightweight plastering gypsum product and a preparation method thereof. Background technique [0002] Phosphogypsum is the solid waste discharged during the production of phosphate fertilizer and phosphoric acid. About 4.5-5t of phosphogypsum is produced for every 1t of phosphoric acid produced. The main component of phosphogypsum is CaSO 4 2H 2 O. The production of phosphogypsum in my country will increase significantly with the increase of high-concentration phosphorus compound fertilizer production year by year. At present, the annual output has exceeded 75 million tons, and the utilization rate is only 40%. The newly added phosphogypsum piled up every year is 4500-5000 tons. The storage pressure is increasing year by year, and the accumulated storage of phosphogypsum is about 600 million tons. Phosphogypsum is generally off-white or gray-black, and co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/16C04B24/38C04B24/14C04B111/40
CPCC04B28/165C04B24/383C04B24/14C04B2111/40C04B2111/00482C04B2201/50C04B22/148C04B7/00C04B14/28C04B14/24C04B24/42C04B2103/44C04B2103/22
Inventor 夏瑞杰刘猛王海龙王庆纪宪坤
Owner 武汉三源特种建材有限责任公司
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