Method of utilizing waste liquid and waste residue of corn pulping to prepare fertilizer

A technology of pulping waste liquid and waste residue, which is applied in the direction of pulp beating/refinement method, application, fertilization device, etc., can solve the problems of long composting time, unfavorable nutrient preservation and utilization, etc., so as to improve fertility and solve waste liquid Pollution problems, the effect of increasing economic benefits

Inactive Publication Date: 2017-05-24
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that corn stalks are currently used as raw materials for composting, and the composting time is long, whi

Method used

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  • Method of utilizing waste liquid and waste residue of corn pulping to prepare fertilizer

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specific Embodiment approach 1

[0029] Specific embodiment one: the present embodiment utilizes the method for making fertilizer from corn pulping waste liquor and residue, comprising the following steps:

[0030] 1. Send the corn stalks into the pulverizer and crush them until the particle size is 1-2cm. First, use the centrifugal fan to send the crushed straws to the high-speed vibrating screen to make the materials in a suspended or semi-suspended state, and then use the cyclone separator to make the skin and Separation of pith to obtain corn stalk husk and waste residue;

[0031] 2. Under normal pressure, the corn stalks are soaked in the dipping solution, and after dipping, the low-concentration waste liquid is extruded through an extruder to collect the low-concentration waste liquid;

[0032] 3. Grind the impregnated corn stalk husk raw material with a double-roller mill, and the slurry separated by the double-roller mill will be sent to a high-consistency refiner for refining. After refining, it will...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that: the corn stalk husk raw material obtained in Step 1 is pretreated first, and then subjected to the next step of dipping treatment. The specific method of the pretreatment is as follows: washing the corn stalk husk raw material with water at 50-60° C., steaming it under normal pressure for 20-30 minutes, and finally feeding it into a screw extrusion deflaking machine for extruding and deflaking. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the impregnating liquid described in step two is KOH, (NH 4 ) 2 SO 3 One or a mixture of two, where the immersion liquid is a mixed liquid when KOH and (NH 4 ) 2 SO 3 The volume ratio is 1:1. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a fertilizer preparation method, in particular to a method of utilizing waste liquid and waste residue of corn pulping to prepare fertilizer, and aims to solve the problem that existing methods of using corn straw as a raw material for composting are long in composting time and bad for storage and utilization of nutrition. The method includes: step 1, feeding corn straw into a smasher after feeding the corn straw into a high-speed vibration screen to enable a material to be in a suspended or half-suspended state; step 2, at normal pressure, soaking corn straw skin in soaking liquid, extruding out low-concentration waste liquid through an extruder after soaking, and collecting the low-concentration waste liquid; step 3, using a two-roller mill to mill the corn straw skin raw material after being soaked, feeding size after milling and separating through the two-roller mill into a high-concentration pulping machine, extruding out high-concentration waste liquid through the extruder after pulping, and collecting the high-concentration waste liquid; step 4, concentrating the low-concentration waste liquid, and mixing the same with the high-concentration waste liquid and waste residue obtained in the step 1 for composting; step 5, discharging, packaging or mixing with sterilized clay for granulation to complete. The method is used for preparing the fertilizer.

Description

technical field [0001] The invention relates to a method for making fertilizer. Background technique [0002] The main pollutants in corn pulping waste liquid are plant fibers, the concentration of pollutants is high, and the treatment is difficult. At present, although waste liquid treatment methods can effectively reduce the pollution of pulping waste liquid, they have not made resource utilization of the active components of pulping waste liquid. If the corn straw chemical mechanical pulp waste liquid is treated by biological method, the biodegradability of the waste liquid is poor, the treatment cost is high, and the sulfide in the waste liquid will inhibit the growth of anaerobic bacteria and cannot be processed; if the waste liquid is evaporated, concentrated, and burned The solid matter in the liquid needs to consume a lot of heat energy because the concentration is too low. [0003] Corn stalks are composed of leaves, husks and pith, among which the two parts of pi...

Claims

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Application Information

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IPC IPC(8): D21B1/34D21D1/20C05F17/00
CPCC05F17/00C05F17/80D21B1/34D21D1/20Y02W30/40
Inventor 岳金权张阳阳赵银铃郑丁源
Owner NORTHEAST FORESTRY UNIVERSITY
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