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A kind of preparation method of gypsum retarder

The technology of gypsum retarder and sawdust is applied in the field of preparation of gypsum retarder, which can solve the problems of waste of resources and no feed value, and achieve the effects of saving resources, cheap products and low production costs.

Active Publication Date: 2020-04-07
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because it has no feeding value, it is often treated as fuel or directly as waste, which will not only cause waste of resources, but also bring huge pressure to the environment.

Method used

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  • A kind of preparation method of gypsum retarder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Remove impurities from the woody material, wash it with water, crush it after drying, and sieve to obtain sawdust below 5mm;

[0020] Prepare 10 parts of layered sodium silicate and 100 parts of water to make a reaction solution, then add 10 parts of sawdust, and react at 74°C for 10 minutes;

[0021] After the reaction is finished, let stand to lower the temperature, filter and add 3 parts of sodium fluorosilicate to the filtrate to obtain a liquid retarder.

[0022] Add 9 parts of the above-mentioned liquid retarder to 100 parts of building gypsum, and then add 55 parts of water (the ratio of water to material is 0.64) to make a test block for performance testing.

Embodiment 2

[0024] Remove impurities from the woody material, wash it with water, crush it after drying, and sieve to obtain sawdust below 5mm;

[0025] Prepare 3 parts of layered sodium silicate and 95 parts of water to make a reaction liquid, then add 15 parts of sawdust, and react at 70°C for 1 hour;

[0026] After the reaction, let stand to cool down, filter and add 1 part of sodium fluorosilicate to the filtrate to obtain a liquid retarder.

[0027] Add 8 parts of the above-mentioned liquid retarder to 100 parts of building gypsum, and then add 56 parts of water (the ratio of water to material is 0.64) to make a test block for performance testing.

Embodiment 3

[0029] Remove impurities from the woody material, wash it with water, crush it after drying, and sieve to obtain sawdust below 5mm;

[0030] Prepare 15 parts of layered sodium silicate and 90 parts of water to make a reaction solution, then add 25 parts of sawdust, and react at 85°C for 2 hours;

[0031] After the reaction, let stand to cool down, filter and add 5 parts of sodium fluorosilicate to the filtrate to obtain a liquid retarder.

[0032] Add 13 parts of the above-mentioned liquid retarder to 100 parts of construction gypsum, and then add 51 parts of water (the ratio of water to material is 0.64) to make a test block for performance testing.

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Abstract

The invention provides a preparation method of a gypsum retarder. Waste wood dust is used for preparing the gypsum retarder and the gypsum retarder is applied to production and application of gypsum building materials, so that resource utilization of the waste wood dust is achieved and the production cost is reduced. The preparation method comprises the following specific steps: preparing layeredsodium silicate and water into a reaction solution, then adding the wood dust, and reacting for 10 minutes to 2 hours at 65-85 DEG C; and after completion of the reaction, standing and cooling down, filtering and then adding sodium fluorosilicate into a filtrate to obtain the liquid retarder. By the preparation method, sources of raw materials are wide, the production cost is low, the disposal problem of the waste wood dust is solved, the environment is protected, and the resource utilization of the waste is achieved. The preparation method is simple and feasible; and by the preparation method, the production cost is low, the obtained retarder has a good effect of retarding gypsum, is low in product price and has excellent cost performance, and the production cost of a gypsum building material enterprise can be significantly reduced.

Description

technical field [0001] The invention relates to a preparation method of a gypsum retarder, and the obtained retarder is used in the production and application of gypsum building materials. Background technique [0002] Gypsum is one of the three major inorganic cementitious materials. my country's natural gypsum reserves are very rich, ranking first in the world. Gypsum has excellent characteristics such as light weight, fire prevention, heat insulation, no radioactivity, good processing performance, low production energy consumption, and recyclability. As an energy-saving green material, it is highly respected internationally. At present, gypsum has become a widely used industrial material and building material. [0003] The shortcomings of building gypsum, such as fast setting and hardening, and large loss of fluidity over time, directly affect the application of gypsum. Usually, retarders are added to the gypsum system to adjust the setting time and keep the gypsum slur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/00C04B103/22
CPCC04B40/0039C04B2103/22C04B22/126C04B12/04C04B22/002C04B24/001
Inventor 赵风清韩福强檀星李超郝亚菲刘卫东
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY