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A method for producing high-purity slaked lime from carbide slag

A kind of carbide slag, skilled technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of high cost, large amount of waste water treatment, complicated process, etc., achieve large production volume, improve high-value utilization, obvious effect

Active Publication Date: 2020-02-04
新疆国峰嘉和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the defects of high cost, complicated process and large amount of wastewater treatment in the traditional recycling process of calcium carbide slag, and realize the purpose of producing high-purity slaked lime by stacking calcium carbide slag by using the suspension drying technology combined with the high-efficiency powder selection technology. The method has the advantages of simple production process, large processing capacity, low cost and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: comprise the following steps:

[0030] a. Preliminary screening: put calcium carbide slag with a water content below 40% into the vibrating screen at a constant speed to remove impurities such as ferrosilicon with a particle size greater than 10cm.

[0031] b. Suspension drying and cyclone separation: Add the calcium carbide slag sieved in step a from the upper feed port of the suspension dryer, and enter 300°C hot air from the air inlet in the middle, and control the wind speed to 5m / s. The pressure is 600pa, and the calcium carbide slag is dried to a water content of 3%. The suspended and dried calcium carbide slag enters the secondary cyclone separation cooler from the discharge port of the suspension dryer, and is separated and cooled to a temperature of 100°C to obtain granules. Carbide slag fine powder and coarse particle impurities with a diameter of less than 100 μm, the fine powder of calcium carbide slag directly enters the high-efficiency powder...

Embodiment 2

[0035] Embodiment 2: comprise the following steps:

[0036] a. Preliminary screening: Put calcium carbide slag with a water content below 40% into the vibrating screen at a constant speed to remove impurities such as ferrosilicon and other large particles with a particle size greater than 10cm.

[0037] b. Suspension drying and cyclone separation: Add the calcium carbide slag sieved in step a from the upper feed port of the suspension dryer, and feed hot air at 330°C from the lower air inlet. The wind speed is controlled at 6m / s. The pressure is 570pa, and the calcium carbide slag is dried to a water content of 2%. The suspended and dried calcium carbide slag enters the secondary cyclone separation cooler from the discharge port of the suspension dryer, and is separated and cooled to a temperature of 90°C to obtain granules. Carbide slag fine powder and coarse particle impurities with a diameter of less than 100 μm, the fine carbide slag powder is first stored in the dry carbi...

Embodiment 3

[0041] Embodiment 3: comprise the following steps:

[0042] a. Preliminary screening: put calcium carbide slag with a water content below 40% into the vibrating screen at a constant speed to remove impurities such as ferrosilicon with a particle size greater than 10cm.

[0043] b. Suspension drying and cyclone separation: Add the calcium carbide slag sieved in step a from the feed inlet in the middle of the suspension dryer, and feed hot air at 360°C from the air inlet in the lower part, and control the wind speed to 5.5m / s. The wind pressure is 540pa, and the calcium carbide slag is dried to a water content of 1%; the suspended and dried calcium carbide slag enters the secondary cyclone separation cooler from the discharge port of the suspension dryer, and is separated and cooled to a temperature of 80°C to obtain Carbide slag fine powder and coarse particle impurities with a particle size of less than 100 μm, the calcium carbide slag fine powder directly enters the high-effi...

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Abstract

The invention discloses a method for producing high-purity slaked lime by using carbide slag. The method is characterized by mainly comprising the following steps: a, primary sieving; b, suspension drying and cyclone separation; c, efficient powder concentrator separation and purification; and d, electromagnetic impurity removal. Compared with the prior art, the method overcomes the defects of high cost, relatively complex process and high wastewater treatment capacity existing in a traditional carbide slag recycling process, achieves the aim of producing high-purity slaked lime by using stacked carbide slag by using a suspension drying technology in combination with an efficient powder concentration technology and is simple in production process, high in treatment capacity, low in cost and environment-friendly.

Description

technical field [0001] The invention relates to a method for producing high-purity slaked lime from carbide slag, which belongs to the technical field of chemical industry. Background technique [0002] Carbide slag is the solid residue after the reaction of calcium carbide and water to produce acetylene gas. Its main component is Ca(OH) 2 , its content is about 80-90%, in addition, it also contains unreacted carbon particles and SiO 2 、Al 2 o 3 , sulfide, oxides of metals such as magnesium and iron, inorganic substances such as hydroxides, and a small amount of organic substances. The existence of impurities affects the application of carbide slag, especially the metallurgical and chemical slaked lime that requires high purity. At present, the treatment methods of carbide slag are mainly stacking, production of building materials and other environmental protection and chemical applications. [0003] The chemical composition of slaked lime is Ca(OH) 2 , the traditiona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/16C04B2/00
CPCC01F11/16C04B2/005
Inventor 但建明刘峰杨志文李洪玲洪成林乔秀文于峰姜丽娜车蜀涛
Owner 新疆国峰嘉和环保科技有限公司
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