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Process of producing cement with papermaking white clay as material

A paper-making lime mud and cement technology, which is applied in the field of new technology, can solve the problems of not mentioning the white mud pretreatment production process and not complying with the full use of production costs by enterprises, and achieve the effect of reducing pollution hazards

Inactive Publication Date: 2007-06-27
GUANGXI YUEGUI GUANGYE HOLDINGS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two patent documents 88102948 and 02138088 only mentioned lime mud as one of the additives, but did not mention the pretreatment production process of lime mud
Moreover, the method introduced in the public literature still needs to add additional heat energy, which is not in line with the purpose of enterprises to make full use of waste heat and waste residue to reduce production costs

Method used

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  • Process of producing cement with papermaking white clay as material
  • Process of producing cement with papermaking white clay as material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the alkali recovery white liquor (the weight percentage of alkali content: 0.3-0.5%) into the vacuum suction filter to filter, so that it can obtain the white mud slurry with the water content of 28-32%, and transport it to The raw material storage yard of the cement plant is transported to the high-efficiency fluidized bed dryer by the conveyor, and the fluidized bed dryer is in contact with the flue gas of the cement shaft kiln. The outlet temperature of the flue gas of the cement shaft kiln is generally 800-1100 ° C. The average residence time of the material in the fluidized bed dryer is 5-10 minutes. After drying, the white mud after alkali removal is obtained. The water content of the white mud and white mud is 2%, and the alkali content can be reduced to 0.2%. In the material workshop, it is drawn from the upper outlet of the high-efficiency fluidized bed dryer by the exhaust fan, and the fine-grained lime mud is further recovered through the cyclone separatio...

Embodiment 2

[0023] Put the alkali recovery white liquor (the weight percentage of alkali content: 0.3-0.5%) into the vacuum suction filter to filter, so that it can obtain the white mud slurry with the water content of 30-35%, and transport it to The raw material storage yard of the cement plant is transported to the high-efficiency fluidized bed dryer by the conveyor, and the fluidized bed dryer is in contact with the flue gas of the cement shaft kiln. The outlet temperature of the flue gas of the cement shaft kiln is generally 800-1100 ° C. The average residence time of the material in the fluidized bed dryer is 8-12 minutes. After drying, the white mud after alkali removal is obtained. The water content of the white mud and white mud is 3%, and the alkali content can be reduced to 0.2%. In the material workshop, it is drawn from the upper outlet of the high-efficiency fluidized bed dryer by the exhaust fan, and the fine-grained lime mud is further recovered through the cyclone separatio...

Embodiment 3

[0025]Put the alkali recovery white liquor (the weight percentage of alkali content: 0.3-0.5%) into the vacuum suction filter to filter, so that it can obtain the white mud slurry with the water content of 30-40%, and transport it to The raw material storage yard of the cement plant is transported to the high-efficiency fluidized bed dryer by the conveyor, and the fluidized bed dryer is in contact with the flue gas of the cement shaft kiln. The outlet temperature of the flue gas of the cement shaft kiln is generally 800-1100 ° C. The average residence time of the material in the fluidized bed dryer is 15-18 minutes. After drying, the white mud after alkali removal is obtained. The water content of the white mud is 0.5%-3%, and the alkali content can be reduced to 0.1%-0.2%. , sent to the raw material workshop of the cement plant, drawn from the upper outlet of the high-efficiency fluidized bed dryer by an exhaust fan, and passed through the cyclone separation dust collector to ...

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Abstract

The process of producing cement with waste papermaking white clay as material includes filtering alkali recovered white fluid in a vacuum suction filter to obtain white clay slurry with water content lower than 30 %, drying through contacting with vertical cement kiln fume inside a fluidized bed drier to obtain alkali-eliminating white clay, and using the white clay as material mixed clay, gypsum, coal and other cement producing material in cement produce shop. The present invention obtains cement material, waste heat and purified cement kiln fume and is environment friendly.

Description

technical field [0001] The invention relates to a papermaking white mud waste treatment method, in particular to a new process for using the papermaking pulping alkali recovery white mud as a raw material for cement production. Background technique [0002] Bagasse pulp belongs to grass fiber pulping. In terms of black liquor treatment alkali recovery, due to the high silicon content (generally around 10%) and the presence of sodium and alkali salts in straw pulp white mud, its recovery cannot be as pure wood pulp white mud. Sludge can be calcined into lime and returned to digestion for direct reuse. At present, papermaking enterprises in the country produce about 1.5 million tons of lime mud every year, and most enterprises still use foreign landfill or directly discharge the lime mud. There have been enterprises using lime mud to generate cement for experiments, but due to the high moisture content of the lime mud and the high energy consumption for drying the lime mud, t...

Claims

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Application Information

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IPC IPC(8): C04B7/24C02F11/12
CPCY02P40/10
Inventor 聂威俸斌黄家驹陈寿冲陈键农皓杨毅沈承
Owner GUANGXI YUEGUI GUANGYE HOLDINGS CO LTD
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