Binder and method for molding calcium-base industrial powder based on binder

A binder and powder technology, applied in the field of calcium-based industrial powder molding and binder, can solve the problems of occupying land resources, waste of calcium resources, limited processing capacity of calcium carbide slag, etc. Actionable effect

Active Publication Date: 2012-11-14
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbide slag not only occupies precious land resources, but also seriously affects the environment and human health, and has become a major social hazard
In 2009, the output of calcium carbide slag in my country was 18 million tons, and a large amount of carbide slag was piled up and left unused, which not only caused a waste of calcium resources, but also brought serious pressure to the protection of the surrounding environment.
[0003] At present, the application of carbide slag mainly focuses on the preparation of cement and the preparation of flue gas desulfurization additives. The treatment capacity of carbide slag is limited, and the comprehensive utilization of carbide slag cannot be fundamentally solved.

Method used

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  • Binder and method for molding calcium-base industrial powder based on binder
  • Binder and method for molding calcium-base industrial powder based on binder
  • Binder and method for molding calcium-base industrial powder based on binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] First, mix hydrochloric acid and water with a mass ratio of 1:10 to make a dilute acid solution binder; weigh 48g of calcium carbide slag with a moisture content of 5% after drying, and fully mix it with 1g of sodium aluminate curing agent in a mortar; 0.24g dilute acid solution binder is fully mixed with the above solid powder, put into the grinding tool, at 300kg / cm 2 Press the pressure for 1min, take it out and dry it, and the heating rate is 1℃ / min when drying. The molded calcium carbide slag is cylindrical with a diameter of 28mm and a height of 28mm. The compressive strength in cold and hot states is greater than 300N / piece, and the thermal stability test at 850°C is greater than 65%.

Embodiment 2

[0055] First, mix phosphoric acid and water at a mass ratio of 1:15 to make a dilute acid solution binder; weigh 98g of calcium carbide slag with a water content of 20% after drying and add 1g of aluminum hydroxide to mix evenly; mix 11g of dilute acid solution binder Fully mix with the above solid powder, put it into the grinding tool, and use 500kg / cm 2 pressure, press for 2min, take out and dry, and the heating rate is 10°C / min during drying. The molded calcium carbide slag is cylindrical with a diameter of 28mm and a height of 28mm, and the compressive strength in hot and cold states is greater than 300N / piece.

Embodiment 3

[0057] First, mix potassium hydroxide and water with a mass ratio of 1:5 to make a dilute alkali solution binder; weigh 99g of calcium hydroxide powder with a water content of 5% after drying (calcium-based substance content is 95%); mix 1.98 g dilute alkali solution binder is fully mixed with the above solid powder, put into the grinding tool, and 2 Press the pressure for 1.5min, take it out and dry it, and the heating rate is 10℃ / min when drying. The molded calcium carbide slag is cylindrical with a diameter of 28mm and a height of 28mm. The compressive strength in cold and hot states is greater than 350N / piece, and the thermal stability test at 850°C is greater than 65%.

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Abstract

The invention relates to a binder and a method for molding calcium-base industrial powder based on the binder. The binder is prepared by mixing an inorganic acid or alkali with water according to the mass ratio of 1:5 to 1:40. The molding method comprises the following steps of: 1) preparing the binder; 2) drying the powder; 3) mixing the binder with the powder; 4) pressing and molding the mixed material, and 5) drying bump material prepared from the step 4). According to the invention, an efficient inorganic binder is developed; the calcium-base industrial powder such as carbide slag and the like is recycled after being molded; and the molding process flow is simple and strong in the maneuverability, and the obstacle of a recycling technology of the calcium-containing powder in coal-to-acetylene industry is solved. According to the invention, a new way for resource utilization of the carbide slag and preparation of high-quality block calcium oxide at high efficiency and low cost is provided.

Description

technical field [0001] The invention belongs to the field of coal-based acetylene, in particular to a binder and a molding method of calcium-based industrial powder based on the binder. Background technique [0002] Carbide slag is the waste residue produced after the hydrolysis of calcium carbide in the process of coal-to-acetylene gas industry. Carbide slag is industrial waste that has been processed, and the accumulated stockpile has reached 130 million tons. Most domestic manufacturers stack or landfill carbide slag on the spot. With the continuous expansion of domestic PVC, PVA and other chemical products, there will be more and more carbide slag. Carbide slag not only occupies precious land resources, but also seriously affects the environment and human health, and has become a major public hazard to society. In 2009, the output of calcium carbide slag in my country was 18 million tons, and a large amount of carbide slag was left unused, which not only caused a waste...

Claims

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Application Information

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IPC IPC(8): C10L5/12C01F11/04B09B3/00
Inventor 公旭中王志林荣毅王明涌汪玉华
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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