Optimizing process for alkali recovery of papermaking waste liquid

A technology for papermaking waste liquid and process, which is applied in the field of optimization process of papermaking waste liquid, can solve the problems such as difficulty in processing and recycling black liquor, and achieve the effect of eliminating heavy pollution

Inactive Publication Date: 2019-04-02
INT CENT FOR BAMBOO & RATTAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects of difficult treatment and recycling of black liquor in the papermaking alkali treatment process in the prior art, the present invention provides an optimized process for alkali recovery of papermaking waste liquor, which extracts the black liquor produced by papermaking cooking, concentrates it through an evaporator, and then Send it to the alkali furnace for combustion, and finally recover the caustic soda through smelting, so as to complete the recycling of papermaking waste black liquor

Method used

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  • Optimizing process for alkali recovery of papermaking waste liquid

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Embodiment 1

[0021] An optimized process for alkali recovery of papermaking waste liquor, including black liquor extraction, evaporation concentration, high-temperature calcination and causticization, the black liquor extraction section is to extract dilute black liquor from pulping cooking liquor, and then extract the extracted black liquor The dilute black liquor is sent to the evaporation workshop for evaporation and concentration, and the dilute black liquor is the raw material source in the alkali recovery process; the evaporation concentration section first uses the steam from the high-temperature calcination section to heat the black liquor from the extraction section, and the black liquor During the heating process, the concentration of water vaporized and escaped from the liquid is concentrated to 45%, and the evaporation and concentration section uses the waste heat of the flue gas to heat and concentrate to 50%; the high-temperature calcination section first further concentrates t...

Embodiment 2

[0030]An optimized process for alkali recovery of papermaking waste liquor, including black liquor extraction, evaporation concentration, high-temperature calcination and causticization, the black liquor extraction section is to extract dilute black liquor from pulping cooking liquor, and then extract the extracted black liquor The dilute black liquor is sent to the evaporation workshop for evaporation and concentration, and the dilute black liquor is the raw material source in the alkali recovery process; the evaporation concentration section first uses the steam from the high-temperature calcination section to heat the black liquor from the extraction section, and the black liquor During the heating process, the concentration of water evaporated and escaped from the liquid is concentrated to 46%, and the evaporation and concentration section uses the waste heat of the flue gas to heat and concentrate to 52%; the high-temperature calcination section first further concentrates t...

Embodiment 3

[0039] An optimized process for alkali recovery of papermaking waste liquor, including black liquor extraction, evaporation concentration, high-temperature calcination and causticization, the black liquor extraction section is to extract dilute black liquor from pulping cooking liquor, and then extract the extracted black liquor The dilute black liquor is sent to the evaporation workshop for evaporation and concentration, and the dilute black liquor is the raw material source in the alkali recovery process; the evaporation concentration section first uses the steam from the high-temperature calcination section to heat the black liquor from the extraction section, and the black liquor During the heating process, the concentration of water evaporated and escaped from the liquid is concentrated to 48%, and the evaporation and concentration section uses the waste heat of the flue gas to heat and concentrate to 55%; the high-temperature calcination section first further concentrates ...

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Abstract

The invention discloses an optimizing process for alkali recovery of papermaking waste liquid, the optimizing process comprises black liquor extraction, evaporation concentration, high-temperature calcining and causticization, the black liquor extraction section is used for extracting dilute black liquor from pulping cooked liquor, the evaporation concentration section is used for heating the black liquor of the black liquor extraction section by virtue of steam from the high-temperature calcining section; the high-temperature calcining working section is used for first concentrating the blackliquor with the concentration of 50% obtained by the evaporation concentration section further to the concentration of 65%, the obtained black liquor is sent to an alkali furnace for high-temperaturecalcining, a melt is formed by the calcined black liquor, and the melt is dissolved into water obtain green liquor; and the causticization section is used for reacting the green liquor with limestoneto obtain a sodium hydroxide solution. According to the optimizing process, the process is simple and feasible, the recycling efficiency of the black liquor is high, and the quality is guaranteed.

Description

technical field [0001] The invention relates to an optimized process for papermaking waste liquid, in particular to an optimized process for alkali recovery of papermaking waste liquid. Background technique [0002] As one of the basic industries of the national economy, papermaking can reflect the development of social civilization and economic construction. Its products are mainly used as basic raw materials for other industries. Therefore, the production and consumption levels of paper and cardboard have become one of the important symbols to measure a country's economic development level and social progress. At present, my country has become the main producer and consumer of the world's paper products industry. At the same time, my country is also a major importer of the world's paper products. The self-sufficiency rate of paper products reaches 88.7%, which basically meets the needs of domestic commodity packaging, printing, press and publishing. and other paper related...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04D21C11/10D21C11/12D21C11/00C01D1/04
CPCC01D1/04D21C11/0064D21C11/04D21C11/10D21C11/122Y02P20/129
Inventor 刘贤淼费本华陈礼生张波
Owner INT CENT FOR BAMBOO & RATTAN
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