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A method for reusing calcium carbide furnace gas dedusting ash, blue charcoal powder and quicklime powder to produce pelletized calcium carbide raw materials

The technology of calcium carbide furnace gas and quicklime powder is applied in the field of calcium carbide furnace gas dust removal and production of pelletized calcium carbide raw materials, which can solve the problem that blue carbon powder and quicklime powder cannot be directly used in the furnace, and the components of calcium carbide furnace gas dust removal are unstable, The problem of high calcium oxide and carbon content can improve the utilization rate of resources, change the surface activity, and realize the effect of recycling.

Active Publication Date: 2020-12-25
北京柯林斯达科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Calcium carbide is an important chemical raw material. The current total annual output in my country is about 45 million tons, and the closed calcium carbide furnace is the most widely used as a calcium carbide production device. However, because the production of 1 ton of calcium carbide produces about 45kg of calcium carbide furnace gas dust removal, it is currently not effective. Utilization, direct disposal will cause serious pollution to the environment
Since the semi-coke and quicklime need to meet certain particle size requirements during the production process, part of the semi-coke powder and quicklime powder cannot be directly put into the furnace for use, resulting in a large amount of solid waste, which not only reduces the utilization rate of raw materials, but also causes certain environmental problems. Pollution
[0003] At present, due to the high recovery cost of calcium carbide furnace gas dedusting ash and backward technology, the main treatment method is landfill. Although some enterprises try to mix calcium carbide furnace gas dedusting ash with quicklime powder for cement production, briquette preparation, Or used as a flue gas desulfurizer, etc. However, due to the characteristics of unstable components, fine particle size, high calcium oxide and carbon content, and easy spontaneous combustion of calcium carbide furnace gas dust, there are few cases of industrial recycling

Method used

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  • A method for reusing calcium carbide furnace gas dedusting ash, blue charcoal powder and quicklime powder to produce pelletized calcium carbide raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Composite Adhesive A was prepared.

[0035] First, prepare the inorganic binder: (1) Dissolve boric acid in water, then add aluminum-containing inorganic salt solution, stir evenly, add precipitant ammonia water while stirring, adjust pH to 8, then age for 2 hours, and then filter to obtain Cake, washing, and drying to obtain boron-containing aluminum hydroxide dry glue; (2) Weigh boron-containing aluminum hydroxide dry glue, precipitated white carbon black, and montmorillonite according to parts by weight, and add them to a mixer and stir for 10-30min to obtain The inorganic binder.

[0036] Next, preparing the composite adhesive: weighing the inorganic adhesive, the organic adhesive and the additives according to the parts by weight, adding them into a mixer and stirring for 1-3 hours to obtain the composite adhesive.

[0037] Wherein, the inorganic binder includes, in parts by weight, 2 parts of boron-containing aluminum hydroxide dry glue, 5 parts of precipitated w...

Embodiment 2

[0042] Composite Adhesive B was prepared.

[0043] First, prepare the inorganic binder: (1) Dissolve boric acid in water, then add aluminum-containing inorganic salt solution, stir evenly, add precipitant ammonia water while stirring, adjust pH to 8, then age for 2 hours, and then filter to obtain Cake, washing, and drying to obtain boron-containing aluminum hydroxide dry glue; (2) Weigh boron-containing aluminum hydroxide dry glue, precipitated white carbon black, and montmorillonite according to parts by weight, and add them to a mixer and stir for 10-30min to obtain The inorganic binder.

[0044] Next, prepare the composite adhesive: weigh the inorganic adhesive, the organic adhesive and the additives according to the parts by weight, add them into the mixer and stir for 1 hour to obtain the composite adhesive.

[0045] Wherein, the inorganic binder includes, in parts by weight, 1 part of boron-containing aluminum hydroxide dry glue, 3 parts of precipitated white carbon bl...

Embodiment 3

[0050] A method for reusing calcium carbide furnace gas dedusting ash, semi-coke powder and quicklime powder to produce pelletized calcium carbide raw materials, comprising the following steps:

[0051] (1) According to the composition of raw materials, an appropriate amount of calcium carbide furnace gas dedusting ash, blue charcoal powder, and quicklime powder are mixed evenly to obtain a mixture;

[0052] (2) Add water to the mixture to adjust the humidity, and add the composite adhesive of Example 1 at the same time, and use a stirrer to stir and then stale and homogenize;

[0053] (3) Send the stale powdery product into a pair of roll forming machine for molding to obtain solid pellets of a certain shape;

[0054] (4) Dry the solid pellets with the hot flue gas generated by the combustion of the hot blast stove. During the drying process, the surface of the solid pellets reacts with CO to form a hard shell of calcium carbonate, which increases the strength of the solid pe...

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Abstract

The invention relates to a method for producing calcium carbide pellet raw material by recycling calcium carbide furnace gas fly ash, semi-coke powder and lime powder. The method comprises the following steps: (1) uniformly mixing the calcium carbide furnace gas fly ash, semi-coke powder and lime powder in a proper ratio according to composition of the raw material, so that a mixture is obtained; (2) adding water into the mixture and humidifying, adding composite adhesive at the same time, uniformly stirring by adopting a stirring machine and then carrying out ageing and homogenizing treatment; (3) feeding the aged powdery product into a roll-type forming machine to be formed, so that solid pellets in a certain shape are obtained; and (4) drying the solid pellets by utilizing hot flue gas generated in combustion of a hot air furnace. The method provided by the invention utilizes solid waste produced in calcium carbide production, and environmental pollution is avoided; and the composite adhesive is added, so that heat intensity of the pellets is improved, and organic adhesive improves cold intensity of the pellets.

Description

technical field [0001] The invention relates to the fields of chemical industry and environmental protection, and specifically relates to a method for producing pelletized calcium carbide raw materials by reusing ash, blue charcoal powder and quicklime powder from calcium carbide furnace gas. Background technique [0002] Calcium carbide is an important chemical raw material. The current total annual output in my country is about 45 million tons, and the closed calcium carbide furnace is the most widely used as a calcium carbide production device. However, because the production of 1 ton of calcium carbide produces about 45kg of calcium carbide furnace gas dust removal, it is currently not effective. Utilization, direct disposal will cause serious pollution to the environment. Since the semi-coke and quicklime need to meet certain particle size requirements during the production process, part of the semi-coke powder and quicklime powder cannot be directly put into the furnace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/942
Inventor 不公告发明人
Owner 北京柯林斯达科技发展有限公司