Gypsum-based building material product moisture-proof treatment process using industrial waste acid

A technology for industrial waste acid and moisture-proof treatment, applied in the field of building materials, can solve the problems of limited use scenarios and short water resistance of gypsum-based building materials products, and achieve the effects of outstanding economic benefits, improved strength, and strong technical versatility

Pending Publication Date: 2021-08-13
云南凝创环保科技有限公司
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Problems solved by technology

[0002] Gypsum is one of the widely used building materials and is a typical air-hardening material. Compared with cement-based materials, gypsum has obvious shortcomings in water resistance, which limits the use scenarios of gypsum-based building materials.

Method used

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  • Gypsum-based building material product moisture-proof treatment process using industrial waste acid
  • Gypsum-based building material product moisture-proof treatment process using industrial waste acid
  • Gypsum-based building material product moisture-proof treatment process using industrial waste acid

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Experimental program
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Embodiment 1

[0044] Using the moisture-proof treatment process described in the present invention to process the phospho-building gypsum block specifically includes the following steps:

[0045] (1) Primary crystallization treatment: Soak the phospho-building gypsum block in the phosphoric acid-containing wastewater discharged from the industrial wet method of preparing phosphoric acid for 3 hours;

[0046] (2) One-time alkali treatment: soak the phospho-building gypsum block after the first crystallization treatment in saturated lime water for 2 hours;

[0047] (3) Secondary crystallization: Soak the phosphorus building gypsum block in the industrial wastewater containing phosphoric acid again to generate calcium monohydrogen phosphate and calcium dihydrogen phosphate crystals;

[0048] (4) Secondary alkali treatment: the phosphogypsum building blocks after the secondary crystallization treatment are soaked in saturated lime water to convert calcium monohydrogen phosphate and calcium dihy...

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Abstract

The invention discloses a moisture-proof treatment process for a gypsum-based building material product by utilizing industrial waste acid, and belongs to the field of building materials. Aiming at the characteristics that the gypsum-based building material product is not resistant to water and low in softening coefficient, a process route of soaking in a phosphoric acid solution twice and soaking in saturated lime water twice is adopted, and a layer of insoluble calcium phosphate crystals is generated in pores and the surface of the gypsum-based building material product. On one hand, insoluble calcium phosphate crystals can hinder the dissolution effect of water on calcium sulfate, and on the other hand, gypsum pores can be filled, so that the aim of improving the strength and water resistance of gypsum is achieved. The technical route is simple, the raw materials are mainly industrial waste acid, the method is green and environment-friendly, the economic benefit is prominent, and the water resistance of the gypsum-based building material product can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of building materials, and more specifically relates to a moisture-proof treatment process for gypsum-based building material products using industrial waste acid. Background technique [0002] Gypsum is one of the widely used building materials and is a typical air-hardening material. Compared with cement-based materials, gypsum has obvious shortcomings in water resistance, which limits the use scenarios of gypsum-based building materials. In recent years, my country's trend of promoting the utilization of industrial by-product gypsum resources has become more and more obvious. Industrial by-product gypsum such as desulfurized gypsum and phosphogypsum are used to support building gypsum in large quantities, and then to manufacture building materials such as gypsum blocks, gypsum slats, and gypsum boards. Solving the water resistance of these gypsum-based building materials is an important technical requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/67
CPCC04B41/67C04B41/5015C04B41/009C04B41/4535C04B41/4552C04B28/14
Inventor 吴磊赵志曼全思臣刘卓张毅廖仕雄
Owner 云南凝创环保科技有限公司
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