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A treatment method for white mud industrial waste residue in pulp mill

A technology of industrial waste slag and treatment method, applied in the direction of solid waste removal, etc., can solve the problems of environmental pollution, high water content, and inability to directly comprehensively utilize, etc., and achieve significant economic benefits and stable content

Inactive Publication Date: 2016-09-07
LUZHAI COUNTY KEKAI TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to address the industrial waste discharged from the alkali recovery section of the existing pulp mill --- white mud due to high water content (40-60%), extremely unstable calcium carbonate content (75-90%), and residual alkali (NaOH) (1-2%), so that it cannot be directly and comprehensively utilized, and it is difficult to store and pile up, causing serious environmental pollution. A treatment method for white mud industrial waste generated in the alkali recovery section of a paper mill is provided to solve the problem of white mud, Carbide slag is difficult to pile up and can not be used efficiently, forming a new treatment process, comprehensive utilization, turning harm into benefit, turning waste into treasure

Method used

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  • A treatment method for white mud industrial waste residue in pulp mill
  • A treatment method for white mud industrial waste residue in pulp mill

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Experimental program
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Effect test

Embodiment 1

[0026] The sources of raw materials for this implementation are as follows:

[0027] White mud is the industrial waste discharged from the alkali recovery section of the paper mill.

[0028] Carbide slag is the industrial waste produced after the hydrolysis of calcium carbide to obtain acetylene gas, and its Ca(OH) 2 The content is 93%-95%.

[0029] Industrial wastewater is weakly acidic wastewater (containing a small amount of sulfuric acid) discharged from pulp and paper mills.

[0030] The calcium carbide slag is sent to the digestion drum slag extractor to be mixed with Na 2 CO 3 A causticization reaction occurs. After the reaction is completed, the product is placed on the belt folding machine and washed with industrial wastewater, so that the NaOH remaining in the reaction product enters the collection tank. The water content of the washed reaction product is kept at about 70%. The reaction after washing After the product and white mud are evenly stirred, the reaction...

Embodiment 2

[0033] The sources of raw materials for this implementation are as follows:

[0034] White mud is industrial waste discharged from pulp mills.

[0035] Carbide slag is the industrial waste produced after the hydrolysis of calcium carbide to obtain acetylene gas, and its Ca(OH) 2 The content is 90%-93%.

[0036] Industrial wastewater is weakly acidic wastewater discharged from pulp and paper mills.

[0037] The calcium carbide slag is sent to the digestion drum slag extractor to be mixed with Na 2 CO 3 A causticization reaction occurs. After the reaction is completed, the product is placed on a belt folding machine and washed with industrial wastewater, so that the NaOH remaining in the reaction product enters the collection tank. The water content of the washed reaction product is kept at about 65%. The reaction after washing After the product and white mud are evenly stirred, the reaction product and white mud are mixed and stirred according to the volume ratio of 1L:2.5...

Embodiment 3

[0040] The sources of raw materials for this implementation are as follows:

[0041] White mud is industrial waste discharged from paper mills.

[0042] Carbide slag is the industrial waste produced after the hydrolysis of calcium carbide to obtain acetylene gas, and its Ca(OH) 2 The content is 97%.

[0043] Industrial wastewater is weakly acidic wastewater discharged from pulp and paper mills.

[0044] The calcium carbide slag is sent to the digestion drum slag extractor to be mixed with Na 2 CO 3 A causticization reaction occurs. After the reaction is completed, the product is placed on the belt folding machine and washed with industrial wastewater, so that the NaOH remaining in the reaction product enters the collection tank. The water content of the washed reaction product is kept at about 75%. The reaction after washing After the product and white mud are evenly stirred, the reaction product and white mud are mixed and stirred according to the volume ratio of 1L:1.5L...

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Abstract

The invention relates to the technical field of industrial waste residue treatment, in particular to a method for processing white mud industrial waste residue in pulp mills. In this method, calcium carbide slag is sent to the digestion drum slag extractor to be mixed with Na 2 CO 3 The causticization reaction occurs, and after the reaction is completed, the product is placed on the belt folding machine and washed with industrial wastewater, so that the NaOH remaining in the reaction product enters the collection tank, and the washed reaction product is mixed with white mud evenly, and then placed on the pre-hanging machine Carry out suction filtration to make the moisture ≦ 30%, and obtain white mud residue and dilute white liquor after suction filtration. The finally obtained white mud slag has a moisture content below 30%, calcium carbonate content above 92%, and residual alkali below 1%. After treatment, white mud and calcium carbide slag can be used in titanium dioxide factories to neutralize waste acid (sulfuric acid) with a concentration of 30%. Using it will fundamentally solve the problem of high-efficiency utilization of lime mud and calcium carbide slag, and form a new treatment process for comprehensive utilization, turning harm into benefit and turning waste into wealth.

Description

technical field [0001] The invention belongs to the technical field of industrial waste residue treatment, and in particular relates to a method for treating white mud industrial waste residue produced in an alkali recovery section of a pulp mill. Background technique [0002] Pulp and paper mills will produce a large amount of causticized lime mud (also known as papermaking lime mud, the main component is calcium carbonate) during the alkali recovery process. The lime mud has a large moisture content (40-60%) and extremely unstable calcium carbonate content (75 -90%), a small amount of residual alkali (NaOH) (1-2%), difficult to store and pile up, and serious environmental pollution. For the causticizing lime mud made of wood, some large paper mills abroad and at home use the lime kiln calcination method to regenerate the lime mud to produce recycled lime, which is recycled in the causticizing process. Pulp and papermaking enterprises that use non-wood fibers as raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 易伟蒋晓光骆建平蒋志坚黄晓雯
Owner LUZHAI COUNTY KEKAI TRADE
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