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Process of comprehensively utilizing caustic sludge from papermaking industry

A solid waste residue and papermaking industry technology, applied in the field of comprehensive utilization of solid waste residue recovered by alkali in the papermaking industry, can solve the problems of lime mud whiteness, uniformity, and poor particle surface strength and purity, and achieve the goal of reducing processing and operating costs and improving economic benefits Effect

Active Publication Date: 2010-09-08
王梅林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 4. How to solve the problems of poor whiteness, uniformity, particle surface strength and purity of traditional alkali recovery lime mud

Method used

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  • Process of comprehensively utilizing caustic sludge from papermaking industry
  • Process of comprehensively utilizing caustic sludge from papermaking industry

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 2

[0046] Carry out according to specific embodiment one, just change the add-on of flocculation sedimentation aid into 3% molten matter amount in step (1); Change the mesh sieve in step (2) into 7 mesh and carry out sieving process, extract slag Sieve with 250 mesh sieves in the process; The vacuum degree in step (3) is adjusted to 550mmHg and carries out vacuum washing slag dehydration; Change the reaction condition in step (4) to reaction concentration 25%, reaction temperature 95 ℃, reaction The reaction time is 100 minutes. After the reaction, the pH value is adjusted to PH10, and fully stirred; the steam is passed into step (5) and the temperature is raised to 72 ° C, and 2% of the treated activator is added, and wet activation treatment is carried out in the activation tank Wash after 40 minutes, adjust the concentration and adjust the pH value to pH10 after grinding to form a calcium carbonate emulsion.

specific Embodiment approach 3

[0047] Carry out according to specific embodiment one, just change the add-on of flocculation sedimentation aid into 4% melt amount in step (1); Change the mesh sieve in step (2) into 9 mesh and carry out sieving process, extract slag Sieve with 250 mesh sieves in the process; The vacuum degree in step (3) is adjusted to 550mmHg and carries out vacuum washing slag dehydration; Change the reaction condition in step (4) to reaction concentration 25%, reaction temperature 100 ℃, reaction The reaction time is 110 minutes. After the reaction, the pH value is adjusted to PH10 and fully stirred; the temperature is raised to 74°C by introducing steam in step (5), adding 2% of the treated activator, and performing wet activation treatment in the activation tank Wash after 40 minutes, adjust the concentration and adjust the pH value to pH10 after grinding to form a calcium carbonate emulsion.

specific Embodiment approach 4

[0048] Carry out according to specific embodiment 1, just change the add-on of flocculation sedimentation aid into 5% melt amount in step (1); Change the mesh sieve in step (2) into 10 mesh and carry out sieving process, extract slag Use 300 mesh sieves to sieve in the processing; The vacuum in the step (3) is adjusted to 600mmHg to carry out vacuum washing slag dehydration; Change the reaction condition in the step (4) into reaction concentration 30%, reaction temperature 105 ℃, reaction The reaction time is 120 minutes. After the reaction, the pH value is adjusted to PH10.5, and fully stirred; the steam in step (5) is heated to 75 ° C, and 3% of the treated activator is added, and the wet method is carried out in the activation tank. Wash after 40 minutes of activation treatment, adjust the concentration and adjust the pH value to PH10.5 after grinding treatment to form a calcium carbonate emulsion.

[0049] The present invention is implemented according to the above-mention...

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Abstract

The present invention is process of comprehensively utilizing caustic sludge from papermaking industry. The improved process has increased green liquid purifying treatment procedure, lime material pre-treating procedure, green mud treating procedure, white mud deashing and dealkalizing procedure, and fine white mud treating procedure. The process has no secondary pollution and low running cost, and can produce green mud for desulfurizing in coal burning boiler, superfine white mud calcium carbonate powder product and active calcium carbonate product.

Description

technical field [0001] The invention relates to the optimization of the traditional papermaking industry alkali recovery technology and the comprehensive development and utilization technology of the solid waste generated in production-green mud and white mud. Background technique [0002] The black liquor produced in the pulping process of the paper industry can effectively solve its pollution problem through the traditional alkali recovery method, but the solid waste generated in the alkali recovery process cannot be well treated due to many imperfect technical problems in the traditional treatment process. Most of the green mud and white mud are directly discharged out of the factory or landfilled, which brings the problem of secondary pollution. [0003] In the current paper industry, the green mud produced by alkali recovery can only be discharged or landfilled. Although the processing methods of white mud include calcination recycling method, chemical filling method an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 王桂林王梅林
Owner 王梅林
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