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Technology of recycling white slime to refine pearl filler with sulfate process

A technology of calcium carbonate filler and sulfate method, which is applied in the regeneration of lye and lime production, etc., can solve the problems of cumbersome and complicated refining process of alkali recovery lime mud, difficulties in sedimentation and purification of bamboo pulp green liquor, and increased processing costs. Achieve significant economic and environmental benefits, mild operating conditions, and simple operating conditions

Inactive Publication Date: 2013-04-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium silicate is easy to form a three-dimensional colloidal network structure in green liquor, a liquid with high concentration of salt, which makes it more difficult for bamboo pulp green liquor to settle and purify.
Patent CN102659161 discloses a preparation process for recovering white mud calcium carbonate by alkali recovery of wood pulp by kraft method, but the refining process of alkali recovery white mud is complicated; The mixture of sodium phosphate, sodium polyphosphate, disodium ethylenediaminetetraacetic acid, zinc sulfate and diethyltriaminepentaacetic acid increases the processing cost and is difficult to implement in actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put the turbid green liquid from the combustion section in the preprocessor, add calcium silicate with 4% of the total mass of the green liquid at a temperature of 80°C, stir evenly, transfer it to the first stage clarifier of the green liquid and let it stand for clarification for 2 hours , the supernatant is the primary purified green liquor.

[0022] (2) The primary purified green liquor is transferred to the second-stage preprocessor for secondary purification, the temperature is controlled at 80°C, 0.2% of the total mass of the green liquor is added with sodium metaaluminate, stirred evenly, and then transferred to the second-stage green liquor clarifier , standing for 3 hours for clarification, the supernatant liquid is the secondary purification green liquid.

[0023] (3) Add causticizing lime milk with a theoretical reaction volume of 1.05 times to the secondary purification green liquor for causticizing, the causticizing stirring speed is 300 rpm, the tempe...

Embodiment 2

[0026] (1) Put the turbid green liquid from the combustion section in the preprocessor, add calcium silicate with 6% of the total mass of the green liquid at a temperature of 75°C, stir evenly, transfer it to the first stage clarifier of the green liquid and let it stand for clarification for 3 hours , the supernatant is the primary purified green liquor.

[0027] (2) The primary purified green liquor is transferred to the second-stage preprocessor for secondary purification, the temperature is controlled at 60°C, 0.3% of the total mass of the green liquor is added with sodium metaaluminate, stirred evenly, and then transferred to the second-stage green liquor clarifier , standing for 5 hours for clarification, the supernatant liquid is the secondary purification green liquid.

[0028] (3) Add causticizing lime milk with the same amount of theoretical reaction to the secondary purification green liquor for causticizing, the causticizing stirring speed is 600 rpm, the temperatu...

Embodiment 3

[0031] (1) Put the turbid green liquid from the combustion section in the preprocessor, add calcium silicate with 2% of the total mass of the green liquid at a temperature of 90°C, stir evenly, transfer it to the first stage clarifier of the green liquid and let it stand for clarification for 1 hour , the supernatant is the primary purified green liquor.

[0032] (2) The primary purified green liquor is transferred to the second-stage preprocessor for secondary purification, the temperature is controlled at 80°C, 0.1% of the total mass of the green liquor is added with sodium metaaluminate, stirred evenly, and then transferred to the second-stage green liquor clarifier , standing for 3 hours for clarification, the supernatant liquid is the secondary purification green liquid.

[0033] (3) Add causticizing lime milk with a theoretical reaction volume of 1.1 times to the secondary purification green liquor for causticizing, the causticizing stirring speed is 200 rpm, the tempera...

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Abstract

The invention relates to a technology of recycling white slime to refine pearl filler with sulfate process, comprising the following steps: firstly utilizing calcium silicate to carry out primary purification on feculent green liquor from a combustion workshop section; then adding sodium metaaluminate to a product for carrying out secondary purification; then adding causticization lime milk in the green liquor of secondary purification for causticization; preparing alkali to recycle white slime suspending liquid; and finally placing sizing agent after causticization in a white slime pre-hanging machine or vacuum washing engine to carry out solid-liquid separation; washing white slime; and collecting filtrate and a filter cake, wherein the filtrate is white liquor, and the filter cake is white slime. Bamboo pulp green liquor is purified twice, and solids in the green liquor are thoroughly removed, so that the white slime white content of bamboo pulp recycle is improved.

Description

technical field [0001] The invention relates to the field of white mud calcium carbonate recovered by alkali from bamboo pulp in the pulp and paper industry, in particular to a process for refining calcium carbonate filler by recovering white mud by sulfate method alkali. Background technique [0002] Alkali recovery is a mature process used in the paper industry to treat the black liquor in the pulping process and recover the alkali used in the pulping process. The end products mainly include steam, alkali and lime mud. White mud refers to the precipitated calcium carbonate formed after the causticizing reaction of green liquor and slaked lime in the alkali recovery process. Because it contains a certain amount of water, it is called white mud. In order to make full use of resources, the recovery process of papermaking soda is equipped with the recycling technology of lime mud, that is, the lime mud is calcined in the converter to obtain quicklime, and then the quicklime is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04
CPCY02P40/44Y02P40/40
Inventor 王建张丹王晓龙高先强玉丽芳刘羚
Owner SHAANXI UNIV OF SCI & TECH