Method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud

Abstract

The invention relates to a method for producing sponge iron co-production sodium aluminate solution by using Bayer process red mud. The method comprises the following steps of: washing the Bayer process red mud, and then drying and crushing the washed Bayer process red mud; mixing the crushed Bayer process red mud with a first type auxiliary agent, a second type auxiliary agent and a catalytic auxiliary agent so as to prepare a mixed green stock; sintering the mixed green stock to prepare a high-temperature sintered clinker; performing dry magnetic separation on the high-temperature sintered clinker, and then grinding the high-temperature sintered clinker to obtain a magnetic material and a first type non-magnetic material; performing dissolution reaction on the magnetic material and a carbon content mother liquor which is obtained by decomposing the sodium aluminate solution in an alumina refinery to obtain the sodium aluminate solution and a ferruginous filter cake; and performing wet magnetic separation on the ferruginous filter cake to obtain a magnetic sponge iron and a second type non-magnetic material. The method for producing the sponge iron co-production sodium aluminate solution by using the Bayer process red mud uses waste materials generated in an alumina production process, changes the waste materials into valuable, and reduces pollutions to the environment because of the deposition of the red mud.

Description

technical field [0001] The invention relates to a method for producing sponge iron co-production sodium aluminate solution, in particular to a method for producing sponge iron co-production sodium aluminate solution using Bayer process red mud. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. With the continuous development of the aluminum industry, the world currently produces about 60 million tons of red mud every year, and the discharge of red mud in my country is more than 4.5 million tons per year. Most of the alumina plants in the world pile up or pour red mud into the deep sea. The storage of red mud not only takes up a lot of land and farmland, but also consumes more yard construction and maintenance costs, and the remaining lye in the red mud goes to the sea. Underground seepage, causing groundwater pollution. In addition, the dust formed by the red mud in the storage yard i...

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Problems solved by technology

[0006] The present invention aims at the complex process and high cost of processing the Bayer red mud by the series method at present, and the discharge of the red mud is increased instead. Insufficiency, provide a kind of method that utilizes red mud of Bayer process to produce sponge iron and co-produce sodium aluminate solution

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