Method for preparing passivation calcium oxide desulfurizer by utilizing carbide slag

A technology of carbide slag and calcium oxide, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of polluted water resources, alkalized land, loss and diffusion of carbide slag, polluted surrounding environment, etc., and is conducive to storage. , to avoid pollution, the effect of short desulfurization time

Inactive Publication Date: 2012-09-12
WUHAN JUNRONG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stacking of calcium carbide slag not only occupies a large amount of land, but also pollutes water resources and alkalized land near the stacking site because calcium carbide slag is easy to lose and spread; long-term stacking may also pollute the surrounding environment due to air drying.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Stir the calcium carbide slag evenly, filter through a three-stage vibrating screen, and dehydrate to calcium hydroxide with a solid content of 65% by a plate and frame filter press;

[0024] (2) Add the passivating agent calcium fluoride of its amount 6% in the calcium hydroxide of solid content 65%, the strengthening agent magnesium chloride of 2%, stir and mix;

[0025] (3) extruding and granulating the homogenate of step (2) into particles of Φ0.5 mm;

[0026] (4) The particles are dried with a chain dryer at 250° C. for 50 minutes with the tail gas of the rotary kiln, calcined at a high temperature of 1000° C. for 50 minutes, and rapidly cooled by a cooling machine to obtain the product.

Embodiment 2

[0028] (1) Stir the calcium carbide slag evenly, filter through a three-stage vibrating screen, and dehydrate it to calcium hydroxide with a solid content of 68% by a plate and frame filter press;

[0029] (2) Add the passivating agent calcium fluoride of its amount 7% in the calcium hydroxide of solid content 68%, the strengthening agent sodium chloride of 3%, stir and mix;

[0030] (3) extruding and granulating the homogenate of step (2) into particles of Φ0.8mm;

[0031] (4) The particles are dried with a chain dryer at 260° C. for 55 minutes with the tail gas of the rotary kiln, calcined at a high temperature of 1050° C. for 56 minutes, and rapidly cooled by a cooling machine to obtain the product.

Embodiment 3

[0033] (1) Stir the calcium carbide slag evenly, filter through a three-stage vibrating screen, and dehydrate to calcium hydroxide with a solid content of 72% by a plate and frame filter press;

[0034] (2) add the passivating agent AD powder of its amount 10% in the calcium hydroxide of solid content 72%, the strengthening agent magnesium chloride of 4%, stir and mix;

[0035] (3) extruding and granulating the homogenate of step (2) into particles of Φ1.2mm;

[0036] (4) The particles are dried with a chain dryer at 280° C. for 63 minutes with the tail gas of the rotary kiln, calcined at a high temperature of 1080° C. for 65 minutes, and rapidly cooled by a cooling machine to obtain the product.

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Abstract

The invention relates to a method for preparing a passivation calcium oxide desulfurizer by utilizing carbide slag, comprising the following steps: uniformly stirring carbide slag, filtering through three-stage vibrating screens, dehydrating by a plate and frame filter press to obtain calcium hydrate with the solid content of 65-75 %; adding a passivator and a reinforcing agent, mixing uniformly with stirring, carrying out extruding granulation to obtain particles with particle size of 0.5-1.5 mm; drying the particles with a chain dryer by using tail gases of a rotary kiln at 250-300 DEG C for 50-70 min, calcining at 1000-1100 DEG C for 50-70 min, and rapidly cooling by a cooler to obtain the product. According to the invention, the industrial waste residue-carbide slag is reasonably utilized, and the pollution of the carbide slag to the environment is avoided; by using the tail gases of the rotary kiln to dry, the waste gases are utilized, the energy consumption is low, and the production cost is low; the produced product has high desulphurization efficiency and short desulphurization time, and can save energy consumption; and the product has the advantages of moisture resistance, high anti-powdering performance, high utilization rate, low ton steel consumption, and long deposited time, and is beneficial for storage and transportation.

Description

technical field [0001] The invention relates to a method for producing metallurgical granular lime by utilizing calcium carbide slag. Background technique [0002] Carbide slag is the precipitate (industrial waste) produced by the hydrolysis of calcium carbide (CaC2) during the production of industrial products such as acetylene gas, polyvinyl chloride, and polyvinyl alcohol. The main component is Ca(OH)2. About 1.15 tons of calcium carbide slag are produced after each ton of calcium carbide is hydrolyzed. The stacking of calcium carbide slag not only occupies a large amount of land, but also pollutes water resources and alkalized land near the stacking site because calcium carbide slag is easy to lose and spread; long-term stacking may also pollute the surrounding environment due to air drying. Carbide slag is one of the industrial wastes that are difficult to dispose of. [0003] Through the analysis of the physical and chemical properties of carbide slag, it can be seen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/48
Inventor 鲁俊
Owner WUHAN JUNRONG TECH
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