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Clean high-value utilization method for preparing fulvic acid and fertilizers by using papermaking black liquor

A technology for papermaking black liquor and fulvic acid, applied in chemical instruments and methods, fertilizer mixtures, applications, etc., can solve problems such as a large number of activated sludge, and achieve sustainable development of agriculture, good environmental protection, and no chemical residues. Effect

Inactive Publication Date: 2012-07-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] At the same time, the mid-stage wastewater generated in the pulp washing and bleaching process will produce a large amount of activated sludge after biochemical treatment

Method used

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  • Clean high-value utilization method for preparing fulvic acid and fertilizers by using papermaking black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]The straw is cut into rods, and the leftovers are completely crushed into materials below 5mm. The straw is cooked with sodium hydroxide and the black liquor is squeezed out of the pulp. The dilute black liquor is first evaporated and concentrated to a thick black liquor with a solid content rate of 40%. Add 30% peracetic acid solution to the thick black liquor, the volume ratio of the peracetic acid solution to the thick black liquor is 1:20, mix well, keep stirring and keep warm at 60°C for reaction. After reacting for 50 minutes, phosphoric acid was added to the reaction solution, stirred and mixed to adjust the pH to 4.5. After standing still, the mixture was vacuum filtered to obtain a supernatant, and the precipitate was collected. The content of fulvic acid in the supernatant was 32.4%.

[0042] The activated sludge obtained from the biological treatment of the wastewater in the middle stage of papermaking is fully mixed with the separated sediment and crushed ...

Embodiment 2

[0044] The rice straw is pretreated to obtain neat rod-shaped papermaking raw materials, and the leftovers are completely crushed. The rice straw is subjected to alkaline pulping, and the separated black liquor enters the preparation tank. The black liquor is concentrated and evaporated to a thick black liquor with a solid content of 35%. Add 30% hydrogen peroxide solution to the thick black liquor, the volume ratio of the hydrogen peroxide solution to the thick black liquor is 1:10, mix and react at 70° C. for 1 hour to obtain light brown liquid. Phosphoric acid was added to the liquid to adjust the pH to 5.4. The precipitate in the liquid is separated by high-speed centrifugation. The content of fulvic acid in the clarified liquid was 18.3%.

[0045] The separated sediment is fully mixed with the activated sludge after the biological treatment of the wastewater in the middle stage of papermaking, and the leftovers of rice stalks are fully mixed, and they are naturally sta...

Embodiment 3

[0047] After the cotton stalks are broken into 0.5-2cm pieces by a special grinder, they are sent to the screw feeder through the gas conveying system, and then enter the steaming ball for cooking. Fine dust and leftover scraps generated during raw material handling are collected by cyclone separators.

[0048] Cotton stalks are cooked with potassium hydroxide, and the chemical composition of the black liquor after cooking is: solid content 11.2%, K 2 O 4.7%, N 1.2%. Concentrate and evaporate the black liquor to a thick black liquor with a solid content rate of 30%, and add 1 volume of hydrogen peroxide solution to 8 volumes of the thick black liquor. The mixture was heated to 85°C while stirring the reaction well for 50 minutes. Nitric acid was added to the mixed solution to adjust the pH to 4.2, at which time some precipitation occurred. The solution is vacuum filtered to obtain a clear fulvic acid solution, and the fulvic acid content is 21.4%.

[0049] Fully mix the se...

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Abstract

The invention relates to a clean high-value utilization method for preparing fulvic acid and fertilizers by using papermaking black liquor, which comprises the following steps of: carrying out alkaline pulping through taking various straws or woods as raw materials, concentrating and evaporating the obtained black liquor, adopting peroxyacetic acid and hydrogen dioxide solution as oxidants and fully agitating and reacting with the strong black liquor for 30-90 minutes at a temperature of 50-90 DEG C to degrade. The pH of reaction liquid is adjusted to 4-6 by acid and the reaction liquid is then subjected to solid-liquid separation to obtain fulvic acid solution. Separated precipitates are added into raw material leftovers and activated sludge for mixing to prepare organic fertilizers or are then added into the organic fertilizers to prepare organic-inorganic compound fertilizers. The papermaking black liquor can be fully subjected to resource utilization, so that not only is the pollution caused by the black liquor eliminated, but also the black liquor is converted into the fulvic acid with high value added; and meanwhile, other solid wastes produced in the papermaking process are prepared into fertilizers, so that the clean high-value utilization of waste resources is realized.

Description

technical field [0001] The invention relates to a method for resource utilization of industrial waste water, in particular to a high-value utilization technology for preparing fulvic acid and fertilizer from papermaking black liquor. technical background [0002] my country is a big country in the production and consumption of paper products. In 2008, the consumption of paper products in my country was 79.35 million tons, ranking second in the world. Due to the lack of forest resources in our country, a large amount of wood pulp and waste paper need to be imported every year, and about 47% of the total paper consumption depends on imports. The annual wastewater discharge of the paper industry has reached 3.67 billion tons, accounting for about 17.0% of the total wastewater discharge of key statistical enterprises in the country, while the COD discharge is 1.597 million tons, accounting for 32.4% of the country's total COD discharge. The pollution of waste liquid seriously a...

Claims

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Application Information

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IPC IPC(8): C07G99/00C05F15/00C05G1/00C02F9/04
Inventor 莫海涛张小勇肖传绪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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