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Clean high-valued utilization method for straw resources

A straw resource, high-value technology, applied in the field of resource utilization of agricultural solid waste, can solve problems such as water and air pollution, microbial population degradation, crop quality decline, etc., to eliminate pollution, speed up separation, and reduce evaporation energy. consumption effect

Inactive Publication Date: 2010-07-28
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

At present, a large number of excessive use of chemical fertilizers has caused many disadvantages such as low fertilizer utilization efficiency, water quality and air pollution, decline in crop quality, soil compaction, and microbial population degradation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The wheat straw is sheared to obtain a rod shape with a diameter of 2 to 3 cm. The composition of the cooking raw materials is (by mass percentage): straw 100, KOH 10, 1,3-propanediamine 8, anthraquinone 0.1, and the straw is cooked. The cooking liquor is prepared according to the liquid-solid ratio of 2.5:1. KOH and anthraquinone are added to the water while stirring, and the measured 1,3-propanediamine liquid is added after it is fully dissolved. After stirring evenly, quickly enter the cooking tank with the raw materials, and start cooking, the maximum cooking temperature is 135℃. The cooking was completed after 1.5 hours, the pulp yield was 54.8%, and the kappa number was 16.5. The black liquor in the pulp is extruded, and the pulp is further screened and bleached until a qualified paper is obtained. Directly add concentrated phosphoric acid to the black liquor and adjust the pH to about 7.5 to obtain humic acid liquid fertilizer. Its main components are humic aci...

Embodiment 2

[0035] The rice straw is pretreated, and the neat papermaking material obtained is cut into a rod shape with a length of about 3 cm. The composition of the cooking raw materials (by mass percentage): rice straw 100, KOH 12, 1,3-propanediamine 6, and anthraquinone 0.1. The straw cooking process is a liquid-solid ratio of 3:1, a maximum temperature of 140°C, and a time of 2 hours. The pulp yield was 56.2%, and the kappa number was 17.8. After the slurry is extruded from the black liquor, papermaking is further carried out. The separated black liquor is put into the fertilizer preparation tank. Add 27g of potassium chloride, 500g of urea, and 60g of diammonium phosphate per kilogram of hot black liquor directly, stir and dissolve thoroughly, and the pH will decrease. The pH of the fertilizer is adjusted to 8.0 with sulfuric acid to obtain a composite liquid fertilizer. Its main components are organic matter 4.9%, N17.0%, P 2 O 5 2.4%, K 2 O 5.3%.

Embodiment 3

[0037] The reed is cut into a rod shape of 3 to 5 cm and placed in a cooking pot. The cooking process conditions are: reed 100, potassium hydroxide 12, 1,3-propanediamine 10, anthraquinone 0.2, liquid-solid ratio 2.8:1, time 90 minutes, temperature 160°C. After cooking, a good pulp was obtained with a kappa number of 14.9 and a yield of 48.1%. After the black liquor in the pulp is separated, it is screened and bleached until a qualified paper is obtained. Add 22g potassium chloride, 410g urea, 72g monoammonium phosphate and 10g trace elements to each kilogram of black liquor. Trace elements include ferrous sulfate, copper sulfate, zinc sulfate, manganese sulfate, magnesium sulfate, ammonium molybdate and boric acid, chelated with citric acid. Then adjust the pH of the solution to 7.8 with citric acid to obtain the all-element composite liquid fertilizer.

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Abstract

The invention provides a paper pulp and fertilizer co-production technique, which aims at the present statuses of generally low utilization value of straw resources and serious environmental pollution caused by papermaking black liquor in China. In the technique, KOH and 1,3-propane diamine are used as the main stewing components to prepare pulp from various straws. The 1,3-propane diamine is beneficial to removing lignin and enhancing the product yield. High value-added paper products are obtained, and meanwhile, black liquor contains kalium, nitrogen and humic acid, thereby being a good nutrient source for organic fertilizers. Acid is added to the black liquor to neutralize, thereby obtaining a humic acid liquid fertilizer; and nitrogen, phosphorus, kalium and chelated microelements are added to obtain a liquid compound fertilizer. The pulverized straw scraps leftover materials can be directly used for adsorbing the black liquor, and are subjected to evaporation and granulation to prepare a solid organic fertilizer. The whole paper pulp and fertilizer co-production system does not discharge waste, thus the invention can thoroughly eliminate the pollution caused by the papermaking black liquor and realize the clean high-valued utilization of the straw resources.

Description

Technical field [0001] The invention relates to a method for resource utilization of agricultural solid wastes, in particular to a technology for the clean and high-value utilization of straw resources to prepare paper products and solid liquid fertilizers. Background technique [0002] my country is a large agricultural country, and more than 600 million tons of straw wastes such as rice, wheat and cotton stalks can be produced in agricultural production each year. One-third of the straw is used to return to the field, but the utilization value is very low, and nearly half of the straw resources are burned and discarded. Not only are they not used, the incineration also pollutes the environment. Crop straw is a very rich and cheap source of organic matter. As a raw material for papermaking, it has good economic benefits and is currently the best industrial utilization method for high value. [0003] my country is a big country in the production and consumption of paper products i...

Claims

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Application Information

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IPC IPC(8): D21B1/02D21C3/00D21C11/00C05F7/02C05G1/00
Inventor 张小勇莫海涛肖传绪李佐虎
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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