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Method for regulating and controlling alkalinity of red mud through pyrolysis of agricultural biomass waste

A technology for biomass waste and agricultural production, which is applied in the field of regulating the alkalinity of red mud by pyrolysis of agricultural biomass waste, can solve the problems of poor economy and alkalinity control effect, environmental pollution, long adjustment time, etc. The effect of comprehensive utilization is difficult, raw materials and methods are simple and easy to achieve

Active Publication Date: 2020-01-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the high salinity after alkali treatment of red mud in the seawater neutralization method in the prior art, the technical economy of carbon dioxide neutralization and the poor effect of alkalinity control, it is necessary to conduct regulation and research in combination with its alkalinity conversion characteristics. The dissolution of alkali cannot fundamentally realize the long-term stability regulation of red mud alkalinity, the potential secondary pollution effect of inorganic acid method, and the problem that microbial fermentation method needs a long adjustment time to obtain an appropriate pH range; the present invention The purpose is to provide a method for regulating the alkalinity of red mud by pyrolysis of agricultural biomass waste, so as to solve the pollution problem of red mud alkalinity to the environment

Method used

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  • Method for regulating and controlling alkalinity of red mud through pyrolysis of agricultural biomass waste
  • Method for regulating and controlling alkalinity of red mud through pyrolysis of agricultural biomass waste
  • Method for regulating and controlling alkalinity of red mud through pyrolysis of agricultural biomass waste

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The stalks of agricultural waste were cleaned with deionized water, dried at 60°C for 24 hours, crushed with a pulverizer, and passed through a 20-mesh sieve. Place the red mud in a ventilated place to dry naturally for 72 hours and pass through a 100-mesh sieve. Then the treated straw and red mud were mixed and stirred evenly according to the mass ratio of 1:1, and put into the muffle furnace at 10°C·min. -1 After the heating rate was increased to 400 °C, it was pyrolyzed for 2 h. After the pyrolyzed product was cooled to room temperature, 10 g was dispersed in 50 ml of aqueous solution, and the pH value of the supernatant was measured.

[0035] How to measure pH:

[0036] Weigh 10 g of the pyrolyzed product, add 100 ml of distilled water, stir and mix evenly, seal with plastic wrap, stir with a magnetic stirrer (150 rpm) for 1 h, and the supernatant obtained by suction filtration is used for pH determination.

[0037] The pH change trend of the product after pyroly...

Embodiment 2

[0039] The stalks of agricultural waste were cleaned with deionized water, dried at 60°C for 24 hours, crushed with a pulverizer, and passed through a 20-mesh sieve. Place the red mud in a ventilated place to dry naturally for 72 hours and pass through a 100-mesh sieve. Then the treated straw and red mud were mixed and stirred evenly according to the mass ratio of 1:2, and put into the muffle furnace at 10°C·min. -1 After the heating rate was increased to 400 °C, it was pyrolyzed for 2 h. After the pyrolyzed product was cooled to room temperature, 10 g was dispersed in 50 ml of aqueous solution, and the pH value of the supernatant was measured.

[0040] The pH change trend of the product after pyrolysis in this example for 7 days is as follows figure 1 , the pH value of the product after pyrolysis was 9.08, which was lower than the pH value of 11.35 after only red mud was pyrolyzed. And the change trend of the pH value is small with the increase of time, indicating that the...

Embodiment 3

[0042] The stalks of agricultural waste were cleaned with deionized water, dried at 60°C for 24 hours, crushed with a pulverizer, and passed through a 20-mesh sieve. Place the red mud in a ventilated place to dry naturally for 72 hours and pass through a 100-mesh sieve. Then the treated straw and red mud were mixed and stirred evenly according to the mass ratio of 1:3, and put into the muffle furnace at 10°C·min. -1 After the heating rate was increased to 400 °C, it was pyrolyzed for 2 h. After the pyrolyzed product was cooled to room temperature, 10 g was dispersed in 50 ml of aqueous solution, and the pH value of the supernatant was measured.

[0043] The pH change trend of the product after pyrolysis in this example for 7 days is as follows figure 1 , the pH value of the product after pyrolysis was 8.86, which was lower than the pH value of red mud after only red mud pyrolysis was 11.35. And the change trend of the pH value is small with the increase of time, indicating ...

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Abstract

The invention discloses a method for regulating and controlling the alkalinity of red mud through pyrolysis of agricultural biomass waste, which belongs to the technical field of environmental protection. The method comprises the following steps: (1) placing red mud in a ventilated place for natural air drying and sieving treatment to obtain sieved red mud; (2) cleaning collected farmland straw, removing impurities in the straw, cleaning, drying, crushing and sieving to obtain sieved straw; (3) fully mixing the sieved red mud and the sieved straw in a stirring barrel; and (4) putting an obtained mixed red mud and straw into an oxidizing atmosphere for pyrolytic reaction, thereby obtaining the product after the reaction is finished. According to the method, the alkalinity of red mud is reduced by utilizing a product from biomass pyrolysis process; the agricultural biomass waste material straw is adopted, and through the synergistic effect of straw and red mud, the resource utilization problem of straw and strong basicity problem of red mud are solved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for regulating red mud alkalinity by pyrolyzing agricultural biomass waste. Background technique [0002] Red mud is a highly alkaline solid waste produced in the alumina production process. For every 1 ton of alumina produced, about 1.0 to 2.0 tons of red mud will be produced. The stock is about 4.6 billion tons, and the stock of red mud in China exceeds 800 million tons. The large amount of stockpiling of red mud has caused considerable environmental and safety hazards. The alkaline dust formed by efflorescence on the surface of the stockyard will cause air pollution, and the alkaline substances in the red mud will also penetrate into the soil and groundwater through various channels, causing The salinization of the surrounding soil and the pollution of surface water and groundwater, and more seriously, the dam break of the red mud stockya...

Claims

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Application Information

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IPC IPC(8): C02F11/10C10G1/00
CPCC02F11/10C10G1/00C10G2300/1011Y02W10/40
Inventor 薛生国江钧李楚璇朱锋周晶菊
Owner CENT SOUTH UNIV
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