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Comprehensive utilization method of pulping potash black liquor in paper-making process

A technology of pulping black liquor and papermaking technology, which is applied in the direction of lye regeneration, application, fertilizer mixture, etc., to achieve the effect of reducing costs

Inactive Publication Date: 2003-08-20
吴晓丽 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The technical problem to be solved by the present invention is to control the black liquor in the papermaking industry, eliminate pollution, reduce the cost of pollution control and produce good economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Extract potash pulping black liquor.

[0061] 2. Neutralize its alkalinity with phosphoric acid to a pH of 5.5-6.5.

[0062] 3. Adjust the content of potassium phosphate in the solution to about 4g / L, the content of carbon sources such as polysaccharides to about 20g / L by diluting, concentrating and adding, and then add 1.5g / L of urea, CaCO 3 2.0g / L, MgO.6H 2 O1.0g / L, yeast extract 2.0g / L, polypeptide 5.0g / L, cysteine ​​hydrochloride 0.5g / L.

[0063] 4. Insert Clostridium thermocellum, Clostridium thermosaccharolyticum, and Clostridium thermohydrosulfur furicum into a fermenter with stirring at 60° C. to produce ethanol.

[0064] 5. The residue liquid after distilling alcohol and the crushed straw are mixed to form a mixture. The total solid-to-liquid ratio is about 1:1 (w / w), and the moisture content is about 50% to 60%. Put it into compost Ferment in the device to get organic fertilizer.

[0065] 6. The fermented organic fertilizer is combined with 5% calcium m...

Embodiment 2

[0067] 1. Extract potash pulping black liquor.

[0068] 2. Neutralize its alkalinity with phosphoric acid to a pH of about 6, and remove part of the lignin by precipitation.

[0069] 3. Adjust the content of potassium phosphate in the solution to about 5g / L and the content of carbon source substances such as polysaccharides to about 30g / L by diluting, concentrating and adding, and then add 5.0g / L of urea, CaCO 3 2.0g / L, MgO.6H 2 O1.0g / L, yeast extract 2.0g / L.

[0070] 4. Adjust the pH to 5.5, insert Chaetomium cellulolyticum, and carry out aeration and stirring fermentation in a fermenter at 37° C. to produce feed mycoprotein.

[0071] 5. The mycelium is filtered out from the fermentation broth, washed and dried, and can be used as feed mycoprotein.

[0072] 6. Add the precipitated lignin to the residue liquid after extracting the feed mycoprotein, use the liquid fertilizer to adjust the potassium phosphate content to about 10g / L, and add the urea content to 10g / L, then add...

Embodiment 3

[0075] 1. Extract potash pulping black liquor.

[0076] 2. Neutralize its alkalinity with phosphoric acid to a pH of about 7.

[0077] 3. Adjust the content of potassium phosphate in the solution to about 4g / L and the content of carbon source substances such as polysaccharides to about 30g / L by diluting, concentrating and adding, and then add CaCl 2 0.02g / L, MgSO 4 .7H 2 O0.2g / L, NaMoO 4 .2H 2 O0.002g / L, yeast extract 0.4g / L.

[0078] 4. Insert Klebsiella pneumoniae, Bacillus polymyxa, Bacillus megaterium, Bacillus colioids, and Trichoderma viride, and use a fermenter to stir and aerate at 30°C for about 72 hours to become liquid biological fertilizer or biological fertilizer inoculation agent.

[0079] 5. The biological fertilizer inoculant is used for the manufacture of biological compound fertilizer in Example 1, which can be made into biological organic compound fertilizer.

[0080] 6. The liquid bio-fertilizer is absorbed by peat to become a solid bacterial agent. ...

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Abstract

The comprehensive utilization method of pulping potash black liquor in paper-making process can eliminate pollution, low pollution treating cost and result in high economic benefit. The method includes extracting pulp-making black liquor, neutralizing its alkali with H3OP4 and HNO3 to prepare liquid fertilizer; regulating nutrients, pH regulation and fermentation to produce alcohol or feed protein, mixing the residue with other fertilizer, trace elements, organic matter, etc. to prepare composite fertilizer; adding azotobacteria, phosphate decomposing bacteria, etc. and fermentation to prepare liquid biological fertilizer or inoculating agent; and solid-liquid separation to prepare liquid fertilizer, solid fertilizer or composite fertilizer.

Description

technical field [0001] The invention relates to the treatment of papermaking pulping black liquor, in particular to the comprehensive utilization method and fertilizer production method of potash alkali pulping black liquor. Background technique [0002] The process of treating plant fiber raw materials with alkaline aqueous solution to make pulp is called alkaline pulping. In addition to the lime method, the alkaline chemicals used in the current alkaline pulping are mainly sodium alkalis, such as: NaOH, Na 2 S, Na 2 CO 3 Wait. [0003] After alkaline pulping, about 50% of the fiber raw materials and most of the alkaline substances are dissolved in the cooking liquor and become black liquor. Black liquor is the biggest source of pollution in the paper industry. At present, large papermaking enterprises at home and abroad use traditional combustion methods for black liquor treatment and alkali recovery. This not only greatly reduces the consumption o...

Claims

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Application Information

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IPC IPC(8): C05G1/00D21C11/04
Inventor 吴晓丽顾小平
Owner 吴晓丽
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