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A method for preparing high-performance gypsum-based composite cementitious materials using calcium sulfite type desulfurization gypsum

A technology of composite gelling material and calcium sulfite, which is applied in the field of comprehensive utilization of waste slag modification and treatment, can solve problems such as insufficient utilization and harmful effects of gypsum performance, achieve good economic benefits, relieve environmental pressure, and protect the ecological environment.

Inactive Publication Date: 2016-04-13
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not make full use of the residual alkaline desulfurization agent in the calcium sulfite type desulfurization gypsum, and the residual alkaline desulfurization agent has a harmful effect on the performance of the gypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this example, calcium sulfite-type desulfurized gypsum is used to prepare the raw materials for the gypsum-based composite cementitious material in parts by mass as follows:

[0018] Calcium sulfite type desulfurization gypsum 90%, fly ash 10%, externally mixed with 3% alum and 1% anhydrous sodium sulfate.

[0019] Calcium sulfite type desulfurization gypsum and fly ash are stirred and mixed, and the chemical modifier is fully dissolved in water first, and mixed by spraying during the stirring and mixing process.

[0020] Put the mixed calcium sulfite type desulfurization gypsum in the fluidized furnace, continuously blow air into the tuyere of the fluidized fluidized furnace, make the inside of the fluidized fluidized furnace an oxidizing atmosphere, and keep the calcium sulfite type desulfurization gypsum and modifier in a boiling state , calcined at a temperature of 450° C. and kept for 30 minutes. The performance test of the gypsum-based composite cementitious m...

Embodiment 2

[0024] In this example, calcium sulfite-type desulfurized gypsum is used to prepare the raw materials for the gypsum-based composite cementitious material in parts by mass as follows:

[0025] Calcium sulfite type desulfurization gypsum is 80%, fly ash is 20%, and externally mixed with 3% alum and 1% anhydrous sodium sulfate.

[0026] Calcium sulfite type desulfurization gypsum and fly ash are stirred and mixed, and the chemical modifier is fully dissolved in water first, and mixed by spraying during the stirring and mixing process.

[0027] Put the mixed calcium sulfite type desulfurization gypsum in the fluidized furnace, continuously blow air into the tuyere of the fluidized fluidized furnace, make the inside of the fluidized fluidized furnace an oxidizing atmosphere, and keep the calcium sulfite type desulfurization gypsum and modifier in a boiling state , calcined at a temperature of 550° C. and kept for 30 minutes. The performance test of the gypsum-based composite ceme...

Embodiment 3

[0031] In this example, calcium sulfite-type desulfurized gypsum is used to prepare the raw materials for the gypsum-based composite cementitious material in parts by mass as follows:

[0032] Calcium sulfite type desulfurization gypsum is 70%, fly ash is 30%, and externally mixed with 3% alum and 1% anhydrous sodium sulfate.

[0033] Calcium sulfite type desulfurization gypsum and fly ash are stirred and mixed, and the chemical modifier is fully dissolved in water first, and mixed by spraying during the stirring and mixing process.

[0034] Put the mixed calcium sulfite type desulfurization gypsum in the fluidized furnace, continuously blow air into the tuyere of the fluidized fluidized furnace, make the inside of the fluidized fluidized furnace an oxidizing atmosphere, and keep the calcium sulfite type desulfurization gypsum and modifier in a boiling state , calcined at a temperature of 650° C. and kept for 30 minutes. The performance test of the gypsum-based composite ceme...

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Abstract

The invention relates to a preparation method of a gypsum-based composite gelling material. The method comprises the following steps: (1) uniformly mixing calcium sulfite type desulfurization gypsum with a modifier, wherein the mineral modifier is 10-30% fly ash (coal gangue); the chemical modifier is 1-5% % soluble sulfate; (2) Put the uniformly mixed calcium sulfite type desulfurization gypsum and modifier in a fluidized furnace at 450-650°C (or use power generation and steel enterprise waste gas heating), and keep calcination under an oxidizing atmosphere for 20-40min , Calcium sulfite is oxidized to type II anhydrite, and the fly ash (coal gangue) absorbs the residual alkaline desulfurizer and activates it into active fly ash (coal gangue). The gypsum-based composite cementitious material prepared by the method has the advantages of high strength, good water resistance, low carbon and environmental protection. The invention has a simple process and can utilize waste gas resources from power plants or steel mills during heating. It is an effective method to solve the problem that calcium sulfite type desulfurization gypsum cannot be efficiently utilized, reduces pollution, and is beneficial to the promotion of dry and semi-dry desulfurization processes.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of waste residue modification treatment, in particular, the invention relates to a method for preparing high-performance gypsum-based composite gelling material by using calcium sulfite type desulfurized gypsum. Background technique [0002] In recent years, due to the increasingly serious air pollution in our country and the increasing awareness of environmental protection of the whole people, the state has become more and more strict on the flue gas desulfurization treatment of power plants, steel mills and other enterprises, and also produced a large number of desulfurization by-products. By 2013, my country will emit nearly 100 million tons of desulfurization by-products every year, of which calcium sulfite type desulfurization gypsum accounts for more than 10 million tons, and the emissions are increasing every year. Now the mainstream desulfurization process can be divided into three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/036
Inventor 杨立荣刘志刚霍超姚少巍白瑞英魏庆敏封孝信
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY