Preparation method of composite gypsum cementing material

A technology for composite cementitious materials and gypsum, which is applied in the field of preparation of gypsum composite cementitious materials, can solve problems such as difficult application, poor gel strength, easy cracking, etc., achieves low cost and carbon emission, and improves water softening performance. Effect

Active Publication Date: 2016-05-11
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

Not only that, the content of admixtures other than gypsum in this type of gypsum composite cementitious material is relatively high, resulting in a significantly higher density of the product than building gypsum and a decrease in the moisture-regulating and air-permeable functions of gypsum, and the proportion of admixtures is difficult to grasp, and it is

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  • Preparation method of composite gypsum cementing material

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[0017] The present invention will be further described in detail below in conjunction with specific embodiments, but the present invention is not limited thereto.

[0018] In the examples, 7 kinds of natural and artificial silico-alumina materials are used to prepare silicon-rich materials, and their chemical compositions are shown in Table 1. All silico-alumina raw materials are crushed and then added with alkali to mix and grind uniformly to a fineness of less than 10% of the 200 mesh sieve residue. The ground powder is calcined in the temperature range of 500~1000℃ to obtain silicon-rich materials. The processing parameters of silicon-rich materials in each embodiment are shown in Table 2. Add calcium-alkali materials and gypsum in an appropriate proportion to the silicon-rich materials, and regrind to a fineness of less than 10% on the 200-mesh sieve. According to GB / T17671-1999 cement mortar strength inspection method, the strength performance of 3 days and 28 days is test...

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Abstract

The invention discloses a preparation method of a composite gypsum cementing material. The composite gypsum cementing material is obtained by adding little alkali metal salt to a salic raw material, carrying out low temperature calcination to obtain a silicon-rich material, then proportionally adding calcium alkali raw materials and gypsum to the silicon-rich material and carrying out grinding. All kinds of industrial gypsum used in the preparation method can be used as the raw material of the material, without calcination. The best cost performance can be achieved by adjusting the formula according to specific application needs. Compared with traditional materials of the same kind, the composite gypsum cementing material is lower in cost, can be applied to the regions where Portland cement is not easy to obtain and can conduce to promoting treatment and extensive utilization of the industrial gypsum.

Description

technical field [0001] The invention belongs to the fields of solid waste treatment, ecological gelling materials and applications thereof, and in particular relates to a preparation method of gypsum composite gelling materials. Background technique [0002] Industrial gypsum, also called chemical gypsum, refers to by-products or waste residues produced by chemical reactions in industrial production with calcium sulfate as the main component, mainly including phosphogypsum, desulfurization gypsum, fluorine gypsum, citrate gypsum, titanium gypsum and salt gypsum. Due to environmental protection, the research on the treatment and utilization of industrial gypsum has been continuously strengthened in recent years, among which the treatment and utilization of desulfurized gypsum has made great progress, and the production lines for preparing gypsum board, construction gypsum and cement retarder using it as raw materials have been put into operation one after another. The utiliza...

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Application Information

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IPC IPC(8): C04B11/06C04B11/26C04B11/28C04B11/30
CPCC04B11/06C04B11/262C04B11/266C04B11/28C04B11/30C04B2201/50C04B11/005
Inventor 彭美勋李隆江唐宇成呼琳琳陈翔周旋肖秋国申少华张欣
Owner HUNAN UNIV OF SCI & TECH
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