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A beta-hemihydrate gypsum retarder and a preparing method thereof

A technology of hemihydrate gypsum and retarder, which is applied in the field of building materials, can solve the problems of complex preparation process, high production cost, single effect of retarder, etc., and achieve the effect of simple preparation process, low cost and small loss of strength

Active Publication Date: 2017-06-20
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the current situation of gypsum retarder, its preparation process is generally complicated and the production cost is high. In addition, the effect of retarder is relatively single

Method used

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  • A beta-hemihydrate gypsum retarder and a preparing method thereof
  • A beta-hemihydrate gypsum retarder and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Manganese slag is dried and ground to make manganese slag powder (specific surface area 458m 2 / kg); mix 6 parts of zeolite (200 mesh), 7 parts of manganese slag powder, and 1 part of slag portland cement to obtain retarder.

[0022] 92 parts of β-hemihydrate gypsum and 8 parts of retarder are made into a mixture with a water-to-material ratio of 0.60, molded, and tested for setting time and strength properties.

Embodiment 2

[0024] Dry and grind 4 parts of manganese slag, 5 parts of steel slag and 3 parts of slag to make metallurgical slag powder (specific surface area 458m 2 / kg); Mix 2 parts of zeolite (300 mesh), 4 parts of metallurgical slag powder, and 2 parts of ordinary Portland cement to obtain retarder.

[0025] 94 parts of β-hemihydrate gypsum and 6 parts of retarder are made into a mixture with a water-to-material ratio of 0.61, molded, and tested for setting time and strength properties.

Embodiment 3

[0027] 86 parts of β-hemihydrate gypsum and 14 parts of the retarder obtained in Example 2 were made into a mixture with a water-to-material ratio of 0.59, molded, and tested for setting time and strength properties.

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Abstract

The invention relates to a beta-hemihydrate gypsum retarder and a preparing method thereof. Zeolite and metallurgy waste slag (manganese slag, steel slag or ore slag, and the like) are adopted as main raw materials and are subjected to mechanical grinding and mixing to obtain the inorganic composite retarder. Preparing steps are simple, the cost is low and comprehensive effects are good. Synergistic effects of the zeolite, the metallurgy waste slag and cement are fully utilized, and the setting time of beta-hemihydrate gypsum can be adjusted. When the retarder is compared with traditional retarders such as sodium citrate and sodium hexametaphosphate, loss of strength of a gypsum material of the retarder is low, water tolerance of the gypsum material can be effectively improved, gypsum performance is improved, and a problem that the metallurgy waste slag is accumulated and pollutes the environment can be effectively overcome, thus making the best use of everything.

Description

technical field [0001] The invention relates to a beta hemihydrate gypsum retarder using zeolite, metallurgical waste residue and cement as raw materials and a preparation method thereof, belonging to the field of building materials. Background technique [0002] The setting and hardening speed of building gypsum is very fast, the setting time is only 5-20 minutes, and the operating time is very short, which often cannot meet the needs of molding and construction of gypsum-based materials. In order to solve this problem, a retarder is often used to adjust the setting time of building gypsum. At present, the retarder has become one of the necessary components of various gypsum-based materials such as plaster plaster, gypsum-based putty, and model gypsum. [0003] There are three main types of gypsum retarders commonly used at present: organic acids and their soluble salts, alkaline phosphates, and protein macromolecular compounds. In recent years, extensive research has bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/00C04B103/22
CPCC04B40/0042C04B2103/22C04B22/08C04B22/0006
Inventor 张蒙蒙赵风清陈雄木刘满超冯艳超刘少杰刘洪杰
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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