Device for slag-free production using bauxite or red mud

Abstract

The invention discloses a device for a slag-free production using bauxite or red mud, comprising a rotary furnace and a melting furnace, wherein a smoke outlet is formed in the tail of the rotary furnace, and the tail of the melting furnace is communicated with the head of the rotary furnace; a hot molten iron outlet is formed in the lower side of the head of the melting furnace, and an aluminous clinker outlet is formed in the upper side of the head of the melting furnace; and an alkali dissolving tank is arranged below the head of the melting furnace and the aluminous clinker outlet respectively. The device for the slag-free production using bauxite or red mud has the advantages that: the problem that deslagging cannot be implemented by a blast furnace process in the prior art is solved; alkali and sodium salt are obtained in a gravitational dust collection chamber at the bottom of a waste heat boiler so as to greatly improve the efficiency and reduce the production cost; the red mud is recycled to obtain iron, so that the problems of land occupation and environment pollution are solved; aluminium oxide and iron can be separated and extracted from acicular alferric mineral by the method, so that the problem that aluminium oxide and iron cannot be separated and extracted from acicular alferric mineral by a bayer process, a sintering process and a combination process is solved; and the whole production process achieves zero emission of solid, liquid and gas, real low carbon emission, and environment protection.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a device for slag-free production using bauxite or red mud. Background technique [0002] Using bauxite to extract alumina, Bayer method, sintering method, and combined method are the conventional production processes in the world at present. Although this process is mature, stable, reliable and easy to operate, the biggest defect is that it will produce a large amount of pollutants. - red mud. The main components of red mud are: 5% to 25% of alumina; 30% to 55% of iron oxide; 5% to 25% of silicon oxide; 3% to 9% of sodium oxide; 10% to 15% of loss on ignition; , magnesium oxide, calcium oxide, etc. 5% to 10%. It generally contains a large amount of iron oxide, and its appearance is similar to red soil, hence the name; it is the polluting waste slag discharged when the aluminum industry extracts alumina, its pH value is very high, and the pH value of the leac...

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Problems solved by technology

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, thereby "digesting" a large amount of stockpiled red mud, but, 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 out 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

[0003] Furthermore, the "Bayer method", "sintering method" and "combined method" in the existing alumina production process cannot separate and extract the alumina in the acicular bauxite; the alumina content in this part of raw materials is still low. Higher, some as high as more than 30%, are all discharged into the slag as waste, resulting in a great waste of resources

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