Composite additive promoting recovery of iron and aluminum in red mud as well as preparation method and using method of composite additive

A compound additive and aluminum recovery technology, applied in the direction of improving process efficiency, can solve the problems of cumbersome process, low recovery efficiency, high recovery cost, etc., and achieve the effects of simplifying the extraction process, facilitating recovery, and improving the quality of pellets

Active Publication Date: 2019-03-01
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0006] The purpose of the present invention is to provide a composite additive for promoting the recovery of iron and aluminum from red mud and its preparation and use in view of the technical problems of high recycling cost, cumbersome process and low recovery efficiency of iron and aluminum in red mud in the prior art Method; the use of this compound additive containing calcium fluoride sludge can promote the recovery of iron and aluminum in the red mud, and then realize the efficient recovery of iron and aluminum in the red mud, and realize waste treatment by waste, making industrial Waste is effectively utilized as a resource

Method used

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  • Composite additive promoting recovery of iron and aluminum in red mud as well as preparation method and using method of composite additive
  • Composite additive promoting recovery of iron and aluminum in red mud as well as preparation method and using method of composite additive

Examples

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Embodiment 1

[0043] A composite additive for promoting recovery of red mud, iron and aluminum in this embodiment includes calcium fluoride sludge, kaolin, carbide slag and ground soda. The above components are composed according to the following mass parts in the composite additive: 20-50 parts of calcium fluoride sludge, 5-10 parts of kaolin, 40-70 parts of carbide slag, and 50-80 parts of ground alkali.

[0044] combine figure 1 As shown, a method for recovering iron and aluminum in red mud by using waste resources in this embodiment, the steps are: mixing red mud, reducing agent and composite additives to pelletize and then performing direct reduction and melting, wherein the composite additives include calcium fluoride Sludge, and then get pearl iron and molten slag after separation of slag and iron, and then use alkali solution to leach molten slag to obtain eluate and filter residue, and use the above eluate to produce alumina. The specific steps are:

[0045] The first step: makin...

Embodiment 2

[0071] This embodiment is basically the same as that of Example 1, except that the composite additive of this embodiment also includes sodium humate, and the amount of sodium humate added is 5 to 10 parts. In this embodiment, sodium humate is 8 servings. The red mud added with compound additives is used to prepare green balls, dry the green balls, and then perform direct reduction melting to obtain iron beads and molten slag; the molten slag is then leached with alkali solution, and then solid-liquid separation The eluate and filter residue are obtained, and aluminum hydroxide is precipitated from the eluate.

[0072] Detect the recovery of this embodiment to obtain the iron grade, iron recovery rate and aluminum dissolution rate of the direct reduction iron beads; the test results are as follows: the iron grade of the iron beads is 90.24%, the iron recovery rate is 94.63%, and the molten slag aluminum dissolution rate is 73.36%. %. The recovery efficiency of straight iron a...

Embodiment 3

[0074] This example is basically the same as Example 1, except that the amount of reducing agent added is 20% of the mass of red mud; the components of the composite additive are: 50 parts of calcium fluoride sludge, 5 parts of kaolin, and 65 parts of carbide slag , 80 parts of ground alkali; wherein calcium oxide content ≥ 68% in calcium carbide slag, calcium fluoride sludge calcium fluoride content is 61%, sodium carbonate content in ground alkali is 62%; present embodiment drying temperature 1000 ℃, drying time 20min; after drying, go to the rotary hearth furnace to directly reduce the melting, the reduction temperature is 1350-1450°C, and the reduction time is 35-50min. The reduction temperature of this embodiment is 1400°C, and the reduction time is 43min; the sodium hydroxide alkali solution of this embodiment The concentration is 15%.

[0075] Detect the recovery of this embodiment to obtain the iron grade, iron recovery rate and aluminum dissolution rate of the direct ...

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Abstract

The invention discloses a composite additive promoting recovery of iron and aluminum in red mud as well as a preparation method and a using method of the composite additive, belonging to the technicalfield of resource utilization of red mud waste residues. The composite additive is prepared from calcium fluoride sludge, kaolin, carbide slag and floor alkali (inferior alkali); during use, the composite additive is mixed with the red mud and a reducing agent for pelletizing, and the product is then directly reduced and melted; after that, slag-iron separation is carried out, so that iron beadsand molten slag are obtained; then, the molten slag is subjected to alkali liquor leaching, so that dissolution liquor and filter residue are obtained; finally, the dissolution liquor is used for producing alumina. The composite additive prepared by utilizing the industrial wastes such as the calcium fluoride sludge promotes the recovery of the iron and the aluminum in the red mud, thereby treating wastes by using wastes; furthermore, the environmental pollution caused by the industrial wastes is reduced, and the resource utilization of the industrial wastes is effectively improved.

Description

technical field [0001] The invention discloses a composite additive for promoting recovery of iron and aluminum from red mud, a preparation method and a use method thereof, and belongs to the technical field of resource utilization of red mud waste residue. Background technique [0002] Red mud is produced from the solid insoluble residue in the alkaline leaching process of the Bayer process, and contains a certain amount of alumina, caustic soda, iron-titanium oxide and a small amount of rare metals. The discharge, composition and characteristics of red mud vary with the type of bauxite and the production process, and are generally divided into two types: Bayer red mud and sintering red mud. In the Bayer process, 1-1.5 tons of red mud is discharged per 1 ton of alumina produced; in the sintering method and combined process, 1.5-2.5 tons of red mud is discharged per 1 ton of alumina produced. my country's bauxite resources are characterized by high aluminum, high silicon, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B7/00C22B21/00C21B13/00
CPCC21B13/0006C22B1/2406C22B7/008C22B21/0023Y02P10/20
Inventor 春铁军代梦博音正元龙红明秦立浩王平孟庆民余正伟狄瞻霞魏汝飞
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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