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Method for manufacturing composite particle fertilizer by employing straw slurry paper-making waste

A manufacturing method and a technology of composite particles, which are applied in the field of paper pulping waste to make compound fertilizers, can solve problems such as straw pulping pollution, and achieve the effects of solving pollution problems and optimizing utilization effects

Inactive Publication Date: 2008-05-14
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It belongs to the full utilization of resources and clean production, which not only solves the pollution problem of straw pulping, but also makes the best use of the solid waste and liquid waste of straw pulping to achieve the optimal utilization effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The rice straw raw material is pulped with ammonium sulfite and urea. After cooking, the waste liquid is extracted with a twin-screw squeezer. The solid content of the waste liquid is 12.5%.

[0022] (2) Pour the pulping waste liquid into the reaction kettle, feed in oxygen, and the pressure is 1.0Mpa; the temperature is raised to 100°C; the reaction time is 90min. Increase the organic nitrogen content of waste liquid from 1.2% to 4.8% by oxidative ammonolysis reaction

[0023] (3) Use a 5-effect evaporator to increase the concentration of waste liquid from oxidative ammonium hydrolysis from 12.5% ​​to 38%.

[0024] (4) Use pulverizer to pulverize the grass powder of rice straw preparation, pass through 30 mesh sieves, use the flue gas of boiler to dry to 90% dryness.

[0025] (5) Use a ball mill to pulverize the ash and fly ash of the power boiler, pass through a 40-mesh sieve, and dry to a dryness of 90%.

[0026] (6) Mix power boiler ash: grass powder: waste li...

Embodiment 2

[0030] (1) The rice straw raw material is pulped with ammonium sulfite and urea. After cooking, the waste liquid is extracted with a twin-screw squeezer. The solid content of the waste liquid is 13.1%.

[0031] (2) Pour the pulping waste liquid into the reaction kettle, feed in oxygen, and the pressure is 0.9Mpa; the temperature is raised to 105°C; the reaction time is 85min. Increase the organic nitrogen content of waste liquid from 1.2% to 4.5% by oxidative ammonolysis reaction

[0032] (3) Use a 5-effect evaporator to increase the concentration of waste liquid from oxidative ammonium hydrolysis from 13.1% to 40%.

[0033] (4) Use pulverizer to pulverize the grass powder of rice straw preparation, pass through 30 mesh sieves, use the flue gas of boiler to dry to 90% dryness.

[0034] (5) Use a ball mill to pulverize the ash and fly ash of the power boiler, pass through a 40-mesh sieve, and dry to a dryness of 90%.

[0035] (6) Mix the power boiler ash:grass powder:waste li...

Embodiment 3

[0039] (1) The rice straw raw material is pulped with ammonium sulfite and urea. After cooking, the waste liquid is extracted with a twin-screw squeezer. The solid content of the waste liquid is 11.4%.

[0040] (2) Pour the pulping waste liquid into the reaction kettle, feed in oxygen, and the pressure is 1.1Mpa; the temperature is raised to 95°C; the reaction time is 100min. Increase the organic nitrogen content of waste liquid from 1.2% to 4.6% by oxidative ammonolysis reaction

[0041] (3) Use a 5-effect evaporator to increase the concentration of waste liquid from oxidative ammonium hydrolysis from 11.4% to 38%.

[0042] (4) Use pulverizer to pulverize the grass powder of rice straw preparation, pass through 30 mesh sieves, use the flue gas of boiler to dry to 90% dryness.

[0043] (5) Use a ball mill to pulverize the ash and fly ash of the power boiler, pass through a 40-mesh sieve, and dry to a dryness of 90%.

[0044] (6) Mix power boiler ash: grass powder: waste liqu...

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Abstract

The invention relates a method using waste liquid of straw pulp and solid waste residue of papermaking to produce a granule compound fertilizer of slow release nitrogen and effective silicon, which ischaracterized in that the ammonium sulfite and the urea are used to steam and boil the straw for preparing the soft pulp; then the waste liquid with solids more than 10% of the content is extracted after the steaming and boiling; in the condition of adding oxygen gas with 0.8MPa to 1.2MPa and 90 to 110 DEG C; the waste liquid is reacted for 80 to 100 minutes to increase the content of organonitrogen from 1 to 2% to 4 to 8%; the waste liquid after the oxidation and ammonolysis reaction is concentrated, now the concentration can be increased from 10% to 35 to 45%; the shattered and dried grasspowder, the boiler clinker and the pulverized fuel ash can be even mixed with the waste liquid according to the weight ratio of 2 to 30%, 25 to 30% and 40 to 50%, finally, the product can be packed after granulation and dryness to keep the moisture less than 85%. The nitrogen content of the product is 3 to 6%, the organonitrogen content is 1 to 3%, the effective silicon content is 1 to 5% and thehumic acid content is 25 to 40%.

Description

technical field [0001] The invention belongs to the field of fertilizer production, and relates to the use of papermaking and pulping waste to manufacture compound fertilizers. By using the method, the waste liquid, waste residue and the like of rice straw pulping and papermaking can be fully utilized, and clean production can be truly realized. The invention also relates to the field of agricultural soil fertilizer use. Background technique [0002] Using rice straw to make pulp and paper, less than 40% of the rice straw raw material is transferred to the product and becomes paper; more than 50% of the raw material is transferred to the waste liquid. If the traditional and mature combustion method is used to recover pulping chemicals and heat energy, it is difficult to recover economically due to the high silicon content of the waste liquid. [0003] Rice straw pulping waste liquid contains a large amount of organic matter such as lignin, hemicellulose and cellulose degra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00
CPCY02A40/20
Inventor 刘秉钺石海强白淑云
Owner DALIAN POLYTECHNIC UNIVERSITY
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