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Method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum

A technology of desulfurized gypsum and putty powder, applied in the direction of filling slurry, etc., can solve the problems of poor product reliability, poor use effect, poor adhesion, etc., and achieve the effects of prolonged hardening time, long-lasting time, and strong adhesion

Active Publication Date: 2014-03-19
浙江固德优科技有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Because the amount of putty used is not as large as that of gypsum putty, it was not paid attention to at one time. Some use gypsum powder and glue to mix evenly and then use it directly. There are quality problems such as low strength and easy cracking.
[0005] The traditional caulking gypsum putty powder is prepared by using desulfurized gypsum as the main raw material and directly adding water. The effect is very poor; some use water-retaining agents, binders and methyl cellulose ethers. Although no more than five kinds of additives are added, the cost is high, and the performance is not as stable as natural gypsum due to the source of desulfurized gypsum , resulting in poor product reliability

Method used

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  • Method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process of the present embodiment is as follows:

[0031] 1) Raw material ratio: according to the weight percentage, the adjustment agent is 1.0%, the strengthening agent is 0.5%, the water retention agent is 0.2%, the retarder is 0.3%, the photocatalyst is 0.2%, the binder is 0.2%, the desulfurization gypsum is 87%, and others It is about 10% of calcium magnesium powder.

[0032] 2) Preparation of additives: adjusting agent, reinforcing agent, water retaining agent, retarder, photocatalyst, and binder are mixed according to the weight ratio, and then the above mixed raw materials are sent to the mixer for one stirring and mixed evenly.

[0033] 3) Finished product synthesis: Add 87% of desulfurized gypsum powder and 10% of calcium magnesium powder to the mixture obtained in step 2) according to the weight percentage, perform secondary stirring and mixing, and obtain the finished caulking gypsum putty powder through two times of thorough mixing. can be ...

Embodiment 2

[0036] The preparation process of the present embodiment is as follows:

[0037] 1) Proportion of raw materials: according to the weight percentage, the adjustment agent is 2.0%, the reinforcing agent is 1.0%, the water retention agent is 0.4%, the retarder is 0.4%, the photocatalyst is 0.2%, the binder is 0.25%, the desulfurization gypsum is 80%, calcium Magnesium powder is 15%.

[0038] 2) Preparation of additives: adjusting agent, reinforcing agent, water retaining agent, retarder, photocatalyst, and binder are mixed according to the weight ratio, and then the above mixed raw materials are sent to the mixer for a stirring, fully stirring and mixing;

[0039] 3) Finished product synthesis: Add 80% of desulfurized gypsum powder and 15% of calcium and magnesium powder to the mixture obtained in step 2) according to the weight percentage, carry out secondary stirring and mixing, and obtain the finished caulking gypsum putty powder through two times of thorough mixing. can be u...

Embodiment 3

[0042] 1) Raw material ratio: according to the weight percentage, the adjustment agent is 3.0%, the strengthening agent is 1.5%, the water retention agent is 0.6%, the retarder is 0.5%, the photocatalyst is 0.2%, the binder is 0.2%, the desulfurization gypsum is 85%, calcium Magnesium powder 10%.

[0043] 2) Preparation of additives: adjusting agent, reinforcing agent, water retaining agent, retarder, photocatalyst, and binder are mixed according to the weight ratio, and then the above mixed raw materials are sent to the mixer for one stirring and mixed evenly.

[0044] 3) Finished product synthesis: Add 85% of desulfurized gypsum powder and 10% of calcium magnesium powder to the mixture obtained in step 2) according to the weight percentage, carry out secondary mixing and mixing, and obtain the finished caulking gypsum putty powder through two times of thorough mixing. can be used directly.

[0045] The caulking gypsum powder prepared according to this example meets the buil...

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Abstract

The invention discloses a method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum. The method comprises the following steps: crushing the waste desulfurization gypsum till the particles with granularity of 25-35um are over 80 percent, and performing high-temperature calcining, so that CaSO4.2H2O loses crystal water to form CaSO4.1 / 2H2O or CaSO4; uniformly stirring and mixing the following components at one time in percentage by weight: 0.5-3 percent of regulator, 0.5-1.5 percent of enhancer, 0.1-0.6 percent of water-retaining agent, 0.3-0.5 percent of retarder, 0.2-0.5 percent of photocatalyst and 0.2-0.25 percent of adhesive; adding 80-87wt% of desulfurization gypsum powder and 10-20wt% of calcium magnesium powder into the obtained mixture, and performing secondary stirring and mixing, thus obtaining the caulking gypsum putty powder. The prepared product has the advantages of environment friendliness, cracking resistance, availability and low cost, and more importantly has the characteristic of degrading formaldehyde and other volatile organic compounds.

Description

technical field [0001] The invention relates to a method for preparing caulking gypsum putty powder from flue gas desulfurization gypsum, and belongs to the technical field of building material preparation. Background technique [0002] Desulfurization gypsum is a kind of industrial by-product gypsum, which is a by-product of wet desulfurization of flue gas in power plants. Its composition is basically the same as that of natural gypsum, and its purity and fineness are higher. At present, the emission of desulfurized gypsum in my country is close to 100 million tons per year. It is a treasure to use it, and a disaster to dispose of it. [0003] At present, the utilization rate of desulfurized gypsum in my country is only 30%, and a large amount of desulfurized gypsum is piled up or reclamated into the sea, occupying a large amount of land and causing secondary pollution to the soil. Developed countries attach great importance to the resource utilization of such wastes. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D5/34
Inventor 关杰周洪羽袁昊任浩华苏瑞景
Owner 浙江固德优科技有限公司
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