Novel industrial waste gypsum self forming energy-saving process

A self-curing technology of industrial waste gypsum, which is applied in the field of building materials, can solve the problems of affecting cement performance, incomplete modification, and large investment in treatment, and achieve the effects of improving quality, saving drying energy consumption, and less investment

Inactive Publication Date: 2009-06-17
尹小林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing investment is large, the cost is high, and energy is wasted, and the modification is not complete, which affects the performance of cement. Cement plants can only use waste gypsum balls with natural gypsum. A new energy-saving technology that can completely replace natural gypsum through gypsum modification

Method used

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  • Novel industrial waste gypsum self forming energy-saving process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Phosphogypsum in a certain place is a gray water-containing bulk material, with a natural moisture content of 18.7%, and a soluble phosphate and fluorophosphate content of 2.74%. Curing agent, mixed by weight phosphogypsum: modified curing agent=70:30 ratio, formed into Φ10mm gypsum rod with a roller extrusion molding machine, self-curing drying time 2 days, cement plant comparative test, gypsum rod using comprehensive The performance is better than natural gypsum, the strength is 1.71MPa higher than 3d, and 2.3MPa 28d higher, and the setting time is equivalent to natural gypsum.

Embodiment 2

[0024] The desulfurization gypsum of a power plant is a light yellow bulk material with a water content of 13.4%. The modified curing agent is compounded with methyl cellulose, potassium sulfate and lime, and the ratio of desulfurized gypsum:modified curing agent=99:1 is mixed , extruded into a Φ8mm material rod, and the natural curing and drying time is 3 days. It is used in the comparison test between the cement plant and the natural gypsum. The setting time is the same. The strength increases by 1.83MPa in 3 days, and the strength increases by 3.1MPa in 28 days.

Embodiment 3

[0026] Waste gypsum from a citric acid factory, gray-black, with a moisture content of 23.4%, and a peculiar smell, was compounded with lime, bentonite, slag powder, potassium permanganate, water reducing agent UF, triethanolamine, and potassium sulfate to form a modified and solidified product. agent, mixed according to the ratio of lemon gypsum: modified curing agent = 89:11, extruded into a Φ8mm material rod, self-cured and dried for 3 days, and the odor is completely eliminated. It is used in the comparison test of cement plant and natural gypsum. The setting time Only prolonging for 5 minutes, the strength increased by 3.31MPa in 3 days and 4.73MPa in 28 days.

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Abstract

The invention relates to a novel self-curing and shaping energy-saving process for industrial waste gypsum, and belongs to the technical field of building material. The industrial waste gypsum is mixed with modifying and solidifying agent and shaped into a gypsum bar capable of self-curing and drying. The modifying and solidifying agent is prepared by two or a plurality of lime, magnesite, cement, acetylene sludge, bentonite, fluorite powder, attapulgite powder, industrial residue powder, water glass, eleven salt classes such as sulfate and the like, boric acid, alcohol amine, isopropanol amine, polyvinyl alcohol, water-soluble cellulose, glutaric acid, butane diacid, tartaric acid and water-reducing agent. The process is used for preparing solidification adjusting agent or preparing gypsum powder in the cement manufacturing industry, has the advantages of simple technology, low investment and excellent performance, changes waste into valuable, saves energy and reduces consumption.

Description

Technical field: [0001] The invention relates to a building material, in particular to a new energy-saving process of self-solidification molding of industrial waste gypsum, which is a comprehensive utilization of industrial waste residue resources. Background technique: [0002] my country is a big country in cement production. At present, the total scale of cement production is nearly 1.4 billion tons, and the annual demand for gypsum coagulant is about 70 million tons. On the one hand, the available natural gypsum resources are almost exhausted in some areas, and the price has soared to more than 200 yuan / ton; It not only wastes resources, but also affects the water and soil environment. [0003] The existing more successful industrial waste gypsum treatment method is heat treatment technology, that is, after the waste gypsum is dried and dehydrated, it will be powdered, added water to form balls, dried again, and then supplied to the cement plant. The processing invest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26C04B22/14C04B7/42
CPCC04B28/142C04B28/144C04B28/143Y02W30/91C04B7/02C04B12/04C04B14/102C04B14/104C04B18/141C04B22/0013C04B22/064C04B22/066C04B22/08C04B22/126C04B24/04C04B24/122C04B24/2623C04B24/383C04B2103/302
Inventor 尹小林
Owner 尹小林
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