A preparation method and application of modified rice straw biochar

A technology of rice straw and biochar, which is applied to chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of easy aggregation of particles, high price, toxicity, etc., to increase specific surface area, improve adsorption efficiency, increase The effect of porosity

Active Publication Date: 2021-06-29
JIAYING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these composite materials are often expensive, the particles are too small and easy to agglomerate, and have certain toxicity, which will reduce the types and quantities of environmental microorganisms. These shortcomings limit the popularization and application of these composite materials.

Method used

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  • A preparation method and application of modified rice straw biochar
  • A preparation method and application of modified rice straw biochar
  • A preparation method and application of modified rice straw biochar

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preparation example Construction

[0032] A kind of preparation method of modified rice straw biochar of the present invention, comprises the steps:

[0033] 1) Preparation of raw materials: collect coal-fired power plant fly ash and farmland rice straw with a particle size of less than 0.045mm, and dry the fly ash at 100-110°C; dry the rice straw at 70-90°C, and then Crush until the particle size is less than 1.00mm.

[0034] Among them, the chemical composition of coal-fired power plant fly ash is shown in Table 1.

[0035] Chemical composition (mass fraction) of table 1 fly ash Unit: %

[0036]

[0037]2) Preparation of alkali-melted fly ash: the fly ash and sodium hydroxide obtained in step 1) are mixed in a mass ratio of 1:1 to 1.5, and then roasted at a temperature of 600 to 700°C for 0.5 to 2 hours , The roasted product is crushed until the particle size is less than 1.00mm, and the fly ash after the alkali fusion treatment is obtained, that is, the alkali fusion fly ash. The sodium hydroxide is an...

Embodiment 1

[0042] Dry the fly ash collected in the power plant at 105°C, mix the dried fly ash and sodium hydroxide at a mass ratio of 1:1.2, put it into a corundum crucible, and use a muffle furnace at 650 After calcination at ℃ for 1 hour, take it out after cooling in the furnace, and after crushing, the particle size is less than 1.00mm to obtain alkali-melted fly ash. The farmland rice straw is dried at 80° C., and the particle size of the crushed rice straw is less than 1.00 mm. Mix the dried and pulverized rice straw and alkali-melted fly ash at a mass ratio of 10:3, that is, the added mass of alkali-melted fly ash is 30% of the mass of the rice straw, and then add deionized water into the mixture, The mass volume ratio of the mixture to deionized water is 1:10g / ml, shaken for 2 hours, dried at 80°C, and pulverized until the particle size is less than 1.00mm.

[0043] Put the dried rice straw and alkali-melted fly ash mixture in a corundum crucible, close the lid of the crucible, ...

Embodiment 2

[0046] Dry the fly ash collected in the power plant at 100°C, mix the dried fly ash and sodium hydroxide at a mass ratio of 1:1, put it into a corundum crucible, and use a muffle furnace at 600 After roasting at ℃ for 2 hours, take it out after cooling in the furnace, and after crushing, the particle size is less than 1.00mm to obtain alkali-melted fly ash. The farmland rice straw is dried at 70° C., and the particle size of the crushed rice straw is less than 1.00 mm. Mix the dried and pulverized rice straw and alkali-melted fly ash at a mass ratio of 10:1, that is, the added mass of alkali-melted fly ash is 10% of the mass of the rice straw, and then add a certain amount of Ionized water, the mass volume ratio of the mixture to deionized water is 1:10g / ml, shake for 4 hours, then dry at 70°C, and pulverize until the particle size is less than 1.00mm.

[0047] Put the dried rice straw and alkali-melted fly ash mixture in a corundum crucible, close the lid of the crucible, pu...

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Abstract

The invention discloses a preparation method and application of modified rice straw biochar, which belongs to the field of biological environmental protection technology, and comprises the following steps: 1) preparation of raw materials: collecting power plant fly ash and farmland rice straw and drying them separately , rice straw is crushed; 2) the fly ash obtained in step 1) is mixed with sodium hydroxide and roasted to obtain alkali-melted fly ash; 3) the alkali-melted fly ash obtained in step 2) is added to step 1) adding deionized water to the obtained rice straw, shaking, oscillating, drying, and pulverizing to obtain a mixture of rice straw and alkali-fused fly ash; 4) combining the rice straw obtained in step 3) with alkali-fused pulverized The ash mixture is pyrolyzed and pulverized to obtain modified rice straw biochar; the preparation raw material of the present invention is industrial and agricultural waste, which is cheap and easy to obtain, the preparation method is simple, the production cost is low, and its removal rate of pollutants is high, and the adsorption Large amount, no secondary pollution to the environment, which is helpful for the control and treatment of environmental pollution.

Description

technical field [0001] The invention relates to a method for preparing modified biochar, and more specifically, relates to a method for preparing modified rice straw biochar. The present invention also relates to the application of the modified biochar. Background technique [0002] The discharge of printing and dyeing wastewater is very large. According to European statistics, the weight ratio of fabric and discharged wastewater is 1:150-1:200, and it is about 1:200-1:400 in my country. my country's textile industry wastewater ranks sixth in the country's industrial wastewater discharge, of which 80% is printing and dyeing wastewater. There are many treatment methods for printing and dyeing wastewater, mainly including adsorption, oxidation, membrane separation, flocculation, biodegradation and so on. Adsorption has a special status in the field of wastewater treatment because of its ability to selectively enrich certain compounds. Activated carbon is one of the most eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/30
CPCB01J20/165B01J20/20B01J2220/485C02F1/281C02F1/283C02F2101/308
Inventor 彭娜王开峰成卓鸿刘映婷郭远凯王赢利王春英黄晓霞
Owner JIAYING UNIV
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