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Method of producing fertilizer from black liquid generated during paper making by potassium hydroxide alkali method

A papermaking pulping black liquor and production method technology, applied in the direction of fertilizer form, organic fertilizer, fertilizer mixture, etc., can solve the problems of high energy consumption, high energy consumption, pollution, etc., and achieve no secondary pollutant discharge and low investment , the effect of low energy consumption

Inactive Publication Date: 2004-10-20
顾小平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent document 97107600.6 reports the use of amine salts to treat straw to destroy the surface film of straw, and then use microbial fermentation to produce organic fertilizers, but these methods still do not take into account the degradation of lignin
Chinese patent document 97116556.4, invented the plant material between 250-300 ℃, the pressure is 5-8 kg / cm 2 Under certain conditions, make puffed straw, destroy lignin, and then crush it, add fermentation strains to ferment and make organic fertilizer. This method is very effective for the degradation of lignin, but it is a pity that plant materials need to be consumed when puffing large amount of energy
However, the production of this type of organic potassium fertilizer requires special reaction equipment, and the investment in plant construction is large, the energy consumption in production is large, and certain pollution will also be generated, and the cost of fertilizer is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Crush the crop straw.

[0056] 2. Extract KOH alkaline pulping black liquor.

[0057] 3. Pour KOH alkaline pulping black liquor into the crushed straw and mix well. The ratio of black liquor volume (1) to straw weight (kg) is 1:1.

[0058] 4. Pile the mixture into the cement pool, compact it slightly, cover it with plastic film, and stack it at a natural temperature of not lower than 20°C for more than 5 days.

[0059] 5. Measure the pH, use 30% (w / v) lime emulsion when it is acidic, adjust the pH to 6.5-7.3 with KOH alkaline papermaking pulping black liquor when alkaline, and mix well.

[0060] 6. Use a hammer mill to pulverize urea, add urea and phosphate rock powder and mix well. into fertilizer.

Embodiment 2

[0062] 1. Crush the crop straw.

[0063] 2. Extract KOH alkaline pulping black liquor.

[0064] 3. Pour KOH alkaline pulping black liquor into the crushed straw and mix well. The ratio of black liquor volume (1) to straw weight (kg) is 1:1.

[0065] 4. Pile the mixture into the cement pool, compact it slightly, cover it with plastic film, and stack it at a natural temperature of not lower than 20°C for more than 5 days.

[0066] 5. Measure pH, use 5% (w / v) H for alkaline 3 PO 4 , When it is acidic, adjust the pH to 6.5-7.3 with KOH alkaline pulping black liquor.

[0067] 6. Add crushed urea and phosphate rock powder and mix well. The addition amount is 3% of the dry weight of the straw respectively. Continue to stack for more than 15 days, and turn the pile every few days.

[0068] 7. Mix the fertilizer made above with the fermented municipal waste fertilizer at a ratio of 1:1, sterilize in a hot air drum dryer at 200° C., and cool down.

[0069] 8. Add the liquid bacteri...

Embodiment 3

[0071] 1. Crush the crop straw.

[0072] 2. Extract KOH alkaline pulping black liquor.

[0073] 3. Pour KOH alkaline pulping black liquor into the crushed straw and mix well. The ratio of black liquor volume (1) to straw weight (kg) is 1:1.

[0074] 4. Pile the mixture into the cement pool, compact it slightly, cover it with plastic film, and stack it at a natural temperature of not lower than 20°C for more than 5 days.

[0075] 5. Measure pH, use 30% (w / v) ammonia water when acidic, and adjust pH to 6.5-7.3 with KOH alkaline pulping black liquor when alkaline.

[0076] 6. Add crushed urea and phosphate rock powder and mix well, the addition amount is respectively 3% and 5% of the dry weight of the straw.

[0077] 7. Mix the above-mentioned fertilizer and peat soil 1:1, continue composting for more than 15 days, and turn the compost once every few days.

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PUM

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Abstract

A process for preparing fertilizer from the black liquid generated during making paper by KOH method features that said black liquid is used to treat vegetable material to obtain fertilizer, which can be further processed to obtain different kinds of organic fertilizer, composite inorganic-organic fertilizer and biologic organic fertilizer.

Description

technical field [0001] The invention belongs to pollution control of papermaking pulping black liquor and resource utilization of plant waste, in particular to a fertilizer production method. 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 of caustic soda and sulfide in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/02C05F11/08C05G1/00C05G5/00
Inventor 顾小平吴晓丽
Owner 顾小平
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