Pyrolysis processing method for red mud

Abstract

The invention discloses a pyrolysis processing method for red mud, and relates to the technical field of harmless treatment of solid waste. The method comprises the following steps of: adding red mudinto a fed material pretreatment device, dividing the red mud into two and more than two parts, independently inputting the red mud into two and more than two cylinders, heating the red mud to enablethe red mud to be evaporated and pyrolyzed while a screw propeller of the fed material pretreatment device conveys materials; outputting materials to a high-temperature plasma fusion device from the output of the fed material pretreatment device by the fed material pretreatment device; carrying out high-temperature plasma torch fusion on input materials by the high-temperature plasma fusion device; and conveying the input materials into glass body waste residues and synthesis gases containing CO2, CO and H2. The method has the advantage of high harmless treatment degree.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of solid waste, in particular to a red mud cracking treatment method. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0 to 2.0 tons of red mud are incidentally produced. As the world's fourth largest producer of alumina, China discharges millions of tons of red mud every year. A large amount of red mud cannot be fully and effectively utilized, so it can only rely on large-area storage yards, which takes up a lot of land and causes serious pollution to the environment. The red mud produced in the world is about 70 million tons every year, and the red mud produced in my country is more than 30 million tons every year. The production of a large amount of red mud has caused direct and indirect impacts on human production and life in many aspects, so it is imminent to r...

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Problems solved by technology

[0003] In order to solve this problem, people have tried to use blast furnace method, magnetic separation method (including superconducting magnetic separation method) or flotation method to extract iron from red mud, so as to "digest" a large amount of stockpiled red mud. However, Because the iron in the red mud exists in the state of deep iron oxide, iron salt, etc., the iron in it cannot be extracted by magnetic separation (including superconducting magnetic separation), gravity separation or flotation; while the blast furnace method, Because it contains a relatively large amount of aluminum, titanium and their compounds, these substances are very viscous, which not only prevents the gas-solid-liquid three-phase reaction in the blast furnace, but also makes it impossible for the blast furnace to "spit slag"; although it can be mixed with a large amount of Calcium-containing compounds are used to solve the "sticky" problem, but it greatly increases the production cost, basically has no benefit, and loses practicality, so it is no longer used

[0004] It can be seen that the above-mentioned existing red mud treatment device obviously still has deficiencies and defects in terms of equipment structure, treatment method and use, and needs to be further improved urgently.

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