Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid

A technology for papermaking black liquor and recycling methods, applied in chemical instruments and methods, regeneration of sulfite waste liquor, silica, etc., can solve the problem of unused space, secondary acid wastewater pollution of acid analysis lignin method, alkali Low recovery rate and other issues, to achieve the effect of reducing process energy consumption

Inactive Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the traditional alkali recovery method has the problem of low alkali recovery rate and high energy consumption, and the acid analysis lignin method has the problem of secondary acid wastewater pollution, while the coagulation method only provides a simple idea of ​​pollution control. The chemical method is essentially only an impr...

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  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid
  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid
  • Alkali recovery method for by-producing activated carbon and white carbon black by using paper making black liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Take 3L of straw pulp papermaking black liquor and 660g of carbon powder and mix them in a 5L pressure reactor, seal it, start stirring, and program temperature rise. When the temperature reaches 100°C, feed 1.7MPa CO 2 Gas, continue to heat up to the set temperature of 200°C, after hydrothermal reaction for 3 hours, cool down and discharge, filter, and send the solid phase (first-class hydrothermal carbonization material) into the tube furnace reactor (nitrogen atmosphere protection) for carbonization at 400°C 1h, take 500g of carbon powder and return to the first-level hydrothermal carbonization step for use, and continue to heat up the remaining carbon powder in the tube furnace reactor to 850°C and pass in water vapor for physical activation for 80 minutes to obtain 260g of crude activated carbon, and take 120g for the second-level hydrothermal carbonization During the carbonization process, the rest of the crude activated carbon was washed with 500mL of 5% dilute al...

Embodiment 2

[0044] Take 4L of straw pulp papermaking black liquor and 900g of carbon powder and mix them in a 5L pressure reactor, seal it, start stirring, and program temperature rise. When the temperature reaches 100°C, feed 1.6MPa CO 2 Gas, continue to heat up to the set temperature of 200 °C, after 3.5 hours of hydrothermal reaction, cool down and discharge, filter, and send the solid phase (first-level hydrothermal carbonization material) into the tube furnace reactor (nitrogen atmosphere protection) at 400 °C Carbonize for 1.2 hours, take 680g of carbon powder and return it to the first-stage hydrothermal carbonization step for use, and continue to heat up the remaining carbon powder in the tube furnace reactor to 870°C and pass it into water vapor for physical activation for 70 minutes to obtain 350g of crude activated carbon, and take 160g for the second-stage During the hydrothermal carbonization process, the rest of the crude activated carbon was washed with 650mL of 5% dilute al...

Embodiment 3

[0046] Take 3.5L of straw pulp papermaking black liquor and 780g of carbon powder and mix them in a 5L pressure reactor, seal it, start stirring, and program temperature rise. When the temperature reaches 100°C, feed 1.8MPa CO 2 Gas, continue to heat up to the set temperature of 200 °C, after hydrothermal reaction for 3 hours, cool down and discharge, filter, and send the solid phase (first-level hydrothermal carbonization material) into the tube furnace reactor (nitrogen atmosphere protection) for carbonization at 410 °C 1.3h, take 590g of carbon powder and return to the first-level hydrothermal carbonization step for use, and continue to heat up the remaining carbon powder in the tube furnace reactor to 830°C and pass in water vapor for physical activation for 90 minutes to obtain 310g of crude activated carbon, and take 140g for the second-level water During the thermal carbonization process, the rest of the crude activated carbon was washed with 580mL of 5% dilute alkali so...

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Abstract

The invention relates to paper making industry clean production, in particular to an alkali recovery method based on paper making black liquid. The method comprises the following steps of: 1) adding carbon powder in paper making black liquid, introducing CO2 gas for carrying out primary hydrothermal carbonization, and carrying out filtering to obtain primary hydrothermal carbonization liquid and primary hydrothermal carbonization materials; 2) adding crude activated carbon into the primary hydrothermal carbonization liquid obtained in the first step, carrying out secondary hydrothermal carbonization under the CO2 gas introduction condition, carrying out filtering to obtain secondary hydrothermal carbonization liquid and secondary hydrothermal carbonization materials, evaporating the secondary hydrothermal carbonization liquid, regulating the pH (Potential Of Hydrogen), and carrying out causticization treatment to obtain alkali liquid. The method provided by the invention has the advantages that because the alkali recovery work procedure is a bottle neck of most alkali process pulp making paper making plants in prior art, after the efficiency of the process is improved, the pulp making capability of the paper making plants can be greatly improved, meanwhile, the by-production of high-added-value activated carbon and white carbon black can be realized, and further, the scale benefits of the paper making enterprises can be integrally improved.

Description

technical field [0001] The present invention relates to clean production in the papermaking industry. Specifically, the present invention relates to an alkali recovery method utilizing papermaking black liquor to produce activated carbon and white carbon black. Novel Alkali Recovery Method for Activated Carbon and Silica Products. Background technique [0002] The pollution of the environment, especially the water environment, by the paper industry has attracted worldwide attention. At present, the wastewater pollution of the paper industry has become one of the "six major" public hazards recognized all over the world. At present, the environmental pollution of cooking black liquor in the alkaline pulping and papermaking industry is the most serious, accounting for about 90% of the pollution in the entire papermaking industry, and about 1 / 3 of the pollution impurities contained in the black liquor are inorganic substances, mainly NaOH and SiO 2 etc. About 2 / 3 are organic m...

Claims

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Application Information

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IPC IPC(8): D21C11/02C01B31/10C01B33/12C01B32/336
Inventor 张金平王云山杨刚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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