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Technological process of recovering white clay to produce stuffing calcium carbonate

A calcium carbonate, a new process technology, applied in the field of regeneration of pulping liquid, can solve the problems of difficult utilization, poor uniformity, and difficult sedimentation of impurities, so as to reduce the loss of sodium salt, reduce production costs, and improve alkali recovery rate effect

Inactive Publication Date: 2003-09-10
王梅林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new process for recovering and refining filler calcium carbonate from lime mud, so as to overcome the problems of the existing grass-based raw material alkali recovery of lime mud that is difficult to use, low whiteness of filling, poor uniformity, especially low whiteness
The present invention solves the problem of difficult sedimentation of impurities in the green liquor recovered from grass-alkali by purifying the green liquor and adding a reactive flocculation and sedimentation aid, so that the green liquor can be purified to a high degree; at the same time, the white mud is solved by using the grinding technology Calcium carbonate has poor uniformity, loose structure, low surface strength, and low fineness index, so that the white mud calcium carbonate can meet the index requirements of paper-making fillers after fine treatment

Method used

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  • Technological process of recovering white clay to produce stuffing calcium carbonate
  • Technological process of recovering white clay to produce stuffing calcium carbonate
  • Technological process of recovering white clay to produce stuffing calcium carbonate

Examples

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Effect test

Embodiment 1

[0020] Such as figure 2 As shown, the white mud recovery and filling process includes melting tank, green liquor clarification, causticization, white liquor clarification, white mud refining, thin white liquor and alkali furnace melt are added to the melting tank, and the green liquor is treated in the melting tank. Carry out purification treatment, that is, add reactive flocculation and sedimentation aids in the melting tank; in the white mud refining process, increase the grinding process, that is, after the white mud is carbonized, grind it with a grinder.

[0021] The reaction-type flocculation-precipitation aid is lime emulsion, and its dosage is 2% (total sodium salt content, calculated as 100% CaO), the temperature of the green liquor is controlled at 85° C., and the reaction clarification time is 8 hours.

[0022] The vacuum degree is controlled to 0.0533MPa in the green slime filtration after the green liquor is clarified.

[0023] Due to the flocculation characteri...

Embodiment 2

[0025] The reaction-type flocculation-precipitation aid is lime emulsion, and its consumption is 4% (to the total sodium salt amount, calculated as 100% CaO), the temperature of the green liquor is controlled at 95° C., and the reaction clarification time is 8 hours. The rest are the same as embodiment 1.

Embodiment 3

[0027] The reaction-type flocculation-precipitation aid is lime emulsion, and its consumption is 3% (total sodium salt content, calculated as 100% CaO), the temperature of the green liquor is controlled at 90° C., and the reaction clarification time is 8 hours. The rest are the same as embodiment 1.

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Abstract

The technological process of recovering white clay, as one side product of recovering pulping chemical in paper making, to produce stuffing calcium carbonate includes purifying green liquid in dissolving tank by adding reaction type flocculating precipitation assistant; clarifying green liquid, causticizing; clarifying white liquid; and refining white clay through carbonizing and grinding in grinder. The present invention produces white clay with high whiteness white vacuum treating green clay to reduce loss of sodium salt and raise alkali recovering rate. During purifying green liquid, only lime milk as assistant is added.

Description

Technical field: [0001] The invention relates to the regeneration of pulping liquid in the papermaking industry, in particular to a new process for recovering and refining filler calcium carbonate from by-product white mud produced in alkali recovery production. Background technique: [0002] In recent years, my country's papermaking industry has made great progress. However, due to the lack of wood resources in our country and the abundance and low price of grass resources, the raw materials for papermaking are mainly non-wood fibers, and they will still be maintained for a long period of time in the future. A certain amount of reed pulp, straw pulp, cane pulp, etc. In the current paper industry, caustic lime mud is a by-product in the process of alkali recovery, and its treatment methods mainly include calcination method, chemical method, and water washing method. 1. The calcination method is mainly suitable for wood pulp and papermaking. However, straw pulp fiber raw mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/60D21C11/04
Inventor 李清明王桂林
Owner 王梅林
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