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Method for producing combustible gas by reducing red mud through organic solid waste pyrolysis gas

A technology for organic solid waste and pyrolysis gas, which is applied in the fields of combustible gas purification, combustible gas purification/transformation, recycling technology, etc. The effect of utilization rate, simple process flow and large gas production

Active Publication Date: 2021-08-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the characteristics of red mud itself, its comprehensive utilization has been greatly restricted. In previous studies, red mud was mostly used in cement, roadbed and other building materials. Although it can be used in large quantities, the oxidized Iron, which is the main form of iron, has not been effectively recycled and utilized, but has been directly mixed into it
In the research of reducing red mud to extract effective metals, coke, coal, hydrogen and other resources are often used as reducing agents. Although iron is extracted, a considerable amount of reducing agents will be consumed in the process, and other pollutants may also be emitted.
Not only increases the cost input of comprehensive utilization of red mud, but also may cause secondary pollution to the environment

Method used

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  • Method for producing combustible gas by reducing red mud through organic solid waste pyrolysis gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select red mud, wash it to PH=7~9, dry it at 105°C until it is completely dry, grind it and calcinate it under air condition at 900°C to completely convert the iron component into iron oxide.

[0023] The treated organic solid waste and activated red mud are added to the reactor that has been raised to the required temperature and filled with inert gas. The organic solid waste is rapidly pyrolyzed at high temperature to release pyrolysis gas, and then the pyrolysis gas passes through the red mud In the reaction zone, small molecule combustible gas is produced, and the red mud is reduced at the same time. Here, organic solid waste refers to polyethylene powder, inert gas refers to nitrogen, and the mass ratio of polyethylene powder to red mud is 1:16. Red mud and an equal amount of quartz sand are evenly mixed and then filled into two quartz reactors (mixed quartz Sand is to extend the length of the red mud section), each quartz reactor is only filled half; the organic s...

Embodiment 2

[0027] The difference from Example 1 is that the reaction temperature of the red mud in the second reactor is 750°C.

[0028] In the combustible gas produced by the method, carbon dioxide accounts for 34%, carbon monoxide 3%, hydrogen 15%, methane 35%, ethylene 11%, and 0.5g polyethylene produces 286ml of combustible gas.

[0029] It can be known from Example 1 and Example 2 that when the reaction temperature of red mud is 900°C, more combustible gases are produced.

Embodiment 3

[0031] Select red mud, wash it to PH = 7-9, dry it at 105°C until it is completely dry, grind it and calcinate it under air condition at 840°C to completely convert the iron content in it into iron oxide.

[0032] The treated organic solid waste and activated red mud are added to the reactor that has been raised to the required temperature and filled with inert gas. The organic solid waste is rapidly pyrolyzed at high temperature to release pyrolysis gas, and then the pyrolysis gas passes through the red mud In the reaction zone, small molecule combustible gas is produced, and the red mud is reduced at the same time. Here, the organic solid waste refers to polyethylene powder, the inert gas refers to nitrogen, the mass ratio of polyethylene powder to red mud is 1:8, the pyrolysis temperature is 650°C, and the temperature in the red mud reaction section is 650°C.

[0033] The gas produced after the reaction passes through CH 2 Cl 2 The gas washing bottle is collected and stor...

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Abstract

The invention discloses a method for producing combustible gas by reducing red mud through organic solid waste pyrolysis gas. The method comprises the following steps: cleaning the red mud to reduce the pH value of the red mud; drying the red mud and then calcining under the air condition so that iron is completely oxidized into ferric oxide, and activated red mud is obtained; putting the activated red mud and the organic solid waste into a reactor, pyrolyzing the organic solid waste at 650-850 DEG C under the protection of inert gas, carrying the generated pyrolysis gas into an area where the activated red mud is located by the introduced inert gas for partial or complete oxidation, and reducing ferric oxide in the activated red mud while obtaining micromolecular combustible gas; performing gas washing on the gas generated after the reaction is finished through a gas washing bottle and then collecting the gas so that combustible gas is obtained; and further treating the reduced red mud and extracting the iron contained in the red mud. The method is low in cost and simple in process; various organic wastes can be treated at the same time, so that wastes are treated by wastes; the organic solid waste is high in gas production rate and high in purity after being treated.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for producing combustible gas by using organic solid waste pyrolysis gas to reduce red mud. Background technique [0002] Red mud is a strong alkaline solid waste produced when alumina is extracted from bauxite in the aluminum production industry. Generally speaking, 1.5t to 2.5t of red mud will be produced when 1t of alumina is extracted. At present, the annual discharge of red mud in my country has exceeded 100 million tons, and the cumulative stockpiles have exceeded 200 million tons. The way of disposal is generally to build a dam and stockpile, and its comprehensive utilization rate is only 4%. A considerable part of the red mud has not been properly disposed of. Strong alkalinity will also pollute the surrounding environment, severely damage the ecological environment of the storage place, and the secondary resources contained in the red mud cannot be effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B57/00C10K1/08C10K1/16
CPCC10B53/00C10B57/00C10K1/08C10K1/16Y02W30/82
Inventor 黄群星杜徐东汪守康严建华
Owner ZHEJIANG UNIV