Method for producing calcium carbide pellet raw material by recycling calcium carbide furnace gas fly ash, semi-coke powder and lime powder

A technology of calcium carbide furnace gas and semi-coke powder, which 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 semi-coke powder and lime powder cannot be directly put into the furnace for use, and the composition of calcium carbide furnace gas dust removal ash is unstable , calcium oxide and high carbon content, to improve resource utilization, change surface activity, and realize the effect of recycling

Active Publication Date: 2017-08-04
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 a certain particle size requirement in the production process, some semi-coke powder and lime 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 lime 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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  • Method for producing calcium carbide pellet raw material by recycling calcium carbide furnace gas fly ash, semi-coke powder and lime powder

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 and adjust the pH to 8, then age for 2 hours, and then filter to obtain filter cake, wash, and dry to obtain boron-containing aluminum hydroxide dry glue; (2) weigh aluminum borohydroxide, precipitated white carbon black, and montmorillonite according to parts by weight, add them to a mixer and stir for 10-30 minutes, and obtain the described inorganic binders.

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

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

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 and adjust the pH to 8, then age for 2 hours, and then filter to obtain filter cake, wash, and dry to obtain boron-containing aluminum hydroxide dry glue; (2) weigh aluminum borohydroxide, precipitated white carbon black, and montmorillonite according to parts by weight, add them to a mixer and stir for 10-30 minutes, and obtain the described inorganic binders.

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

[0045] Wherein, the inorganic binder includes, in parts by weight, 1 part of boron-containing aluminum hydroxide, 3 parts of precipitated white carbon black, and 10 p...

Embodiment 3

[0050] A method for reusing calcium carbide furnace gas dedusting ash, semi-coke powder and lime 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 lime 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 pellets and a...

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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, in particular to a method for reusing calcium carbide furnace gas dedusting ash, blue charcoal powder and lime powder to produce pelletized calcium carbide raw materials. 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 a certain particle size requirement in the production process, some semi-coke powder and lime powder cannot be directly put into the furnace for use, resulting in a lar...

Claims

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Application Information

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Patent Type & Authority Applications(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
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