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Slag-free production process using bauxite or red mud

A process method and bauxite technology, applied in the field of metal smelting, can solve problems such as no benefit, blast furnace slag spewing, waste of resources, etc., and achieve the effects of reducing production costs, low operating costs, and high economic benefits

Inactive Publication Date: 2012-10-17
胡长春 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, and thus "digest" a large amount of stockpiled red mud, but , because iron in red mud exists in the state of deep iron oxide, iron salt, etc., so magnetic separation (including superconducting magnetic separation), gravity separation or flotation cannot extract the iron at all; while blast furnace method , because it contains a relatively large amount of aluminum, titanium and their compounds, and 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 Calcium-containing compounds to solve the "sticky" problem, but it greatly increases the production cost, basically has no benefit, loses practicality, so it is no longer used
[0004] 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 the raw material is still relatively high, Some as high as more than 30%, are all discharged into the slag as waste, resulting in a great waste of resources

Method used

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  • Slag-free production process using bauxite or red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] see figure 1 , a process for utilizing bauxite or red mud to produce slag-free production, comprising the steps of:

[0035] a) Take bauxite or red mud, lime, and coal according to the percentage by weight of 1:0.05:0.2, and mix them uniformly to make mixed raw meal;

[0036] b) Add the above mixed raw material into the rotary kiln 1, the temperature in the rotary kiln 1 from the tail to the head gradually rises from 800 degrees Celsius to 1460 degrees Celsius; after 2 hours of drying and pre-reduction, the semi-molten state of reducing material;

[0037] c) The above-mentioned reducing material is entered into the melting furnace 2 through the closed passage 4 through the discharge port of the rotary kiln 1; three gas guns 23 are installed at the head of the melting furnace 2, and the guns of the gas guns 23 are The mouths are all facing the tail of the melting furnace 2, and the reducing materials are heated and melted; three gas guns 23 are installed at the tail of...

Embodiment 2

[0041] see figure 1 , a process for utilizing bauxite or red mud to produce slag-free production, comprising the steps of:

[0042] a) Take bauxite or red mud, lime, and coal according to the percentage by weight of 1:0.1:0.3, and mix them uniformly to make mixed raw meal;

[0043] b) Add the above mixed raw meal into the rotary kiln 1, the temperature in the rotary kiln 1 from the tail to the head gradually rises from 800 degrees Celsius to 1460 degrees Celsius; after 5 hours of drying and pre-reduction, the semi-molten state of reducing material;

[0044] c) The above-mentioned reducing material is entered into the melting furnace 2 through the closed passage 4 through the discharge port of the rotary kiln 1; three gas guns 23 are installed at the head of the melting furnace 2, and the guns of the gas guns 23 are The mouths are all facing the tail of the melting furnace 2, and the reducing materials are heated and melted; three gas guns 23 are installed at the tail of the ...

Embodiment 3

[0048] see figure 1 , a process for utilizing bauxite or red mud to produce slag-free production, comprising the steps of:

[0049] a) Take bauxite or red mud, lime, and coal according to the percentage by weight of 1:0.2:0.4, and mix them uniformly to make mixed raw meal;

[0050] b) Add the above mixed raw material into the rotary kiln 1, the temperature in the rotary kiln 1 from the tail to the head gradually rises from 800 degrees Celsius to 1460 degrees Celsius; after 7 hours of drying and pre-reduction, the semi-molten state of reducing material;

[0051] c) The above-mentioned reducing material is entered into the melting furnace 2 through the closed passage 4 through the discharge port of the rotary kiln 1; three gas guns 23 are installed at the head of the melting furnace 2, and the guns of the gas guns 23 are The mouths are all facing the tail of the melting furnace 2, and the reducing materials are heated and melted; three gas guns 23 are installed at the tail of ...

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Abstract

The invention provides a slag-free production process using bauxite or red mud. The method comprises the following steps: a) preparing a mixed raw material from bauxite or red mud, lime and coal in proportion; b) adding the mixed raw material into a rotary kiln for drying and pre-reduction so as to obtain a reduced material in a semi-melting state; c) adding the reduced material into a melting-separation furnace for melting and separation of slag and iron, wherein high-alumina clinker at an upper layer is discharged from a high-alumina clinker outlet, and hot molten iron at a lower layer flows out from a hot molten iron outlet; and d) allowing the high-alumina clinker discharged from the high-alumina clinker outlet to enter into an alkali dissolution tank containing a proper amount of alkali liquor and carrying out stirring and solid-liquid separation so as to obtain a sodium aluminate solution and solid light metal oxides of silicon, calcium, magnesium and titanium. The process provided in the invention has the following advantages: production cost is reduced, resource utilization of red mud is realized, alumina and iron in alumogoethite can be separated and extracted, and pollution to environment caused by generation of red mud is eradicated; separation and utilization of all the elements in bauxite and red mud are realized, operation cost is low, economic benefits are high, and the slag-free production process is green and environment friendly and has recyclicity.

Description

technical field [0001] The invention belongs to the technical field of metal smelting, and in particular relates to a slag-free production process 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 for producing alumina in the world. Although this process is mature, stable and reliable, the biggest defect is that it will produce a large amount of Contaminant 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 leachate is 12....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08C01F7/04
CPCY02P10/20
Inventor 胡长春胡晓雪
Owner 胡长春
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