Method for separating iron and aluminum from red mud and/or iron-containing solid waste

A technology for separation of iron and solid-liquid separation, applied in the field of separation of iron and aluminum, can solve the problems of the comprehensive utilization rate of red mud not exceeding 10%, the corrosion of heat storage materials and reaction materials, and the lack of macro utilization technology. Potential for industrial applications, low equipment requirements, mild effects

Inactive Publication Date: 2017-12-08
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron separation technology of carbothermal reduction involves high temperature requirements for equipment, and the alkaline compounds in red mud severely corrode heat storage materials a

Method used

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  • Method for separating iron and aluminum from red mud and/or iron-containing solid waste
  • Method for separating iron and aluminum from red mud and/or iron-containing solid waste
  • Method for separating iron and aluminum from red mud and/or iron-containing solid waste

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0067] Example 1

[0068] The process of separating aluminum and iron by acidolysis and fractional precipitation of red mud includes the following steps:

[0069] (1) React 1kg of red mud and 4kg of 50wt% sulfuric acid at 170°C for 10h to obtain a slurry;

[0070] (2) the slurry is separated to obtain 0.3kg of reaction residue (first product) and acidic solution;

[0071] (3) Add 200g of reduced iron powder to the acidic solution, the reaction is complete at 50°C, and the yellow solution turns into a green solution;

[0072] (4) Add 10wt% ammonia aqueous solution dropwise in the solution, control the pH value at 4.5, obtain a colloidal slurry containing off-white, after centrifugation, obtain the corresponding colloidal precipitation and transparent solution;

[0073] (5) After the colloid precipitation obtained in step (4) is dried and calcined, 0.4kg of the second product is obtained;

[0074] (6) Add ammonia solution dropwise to the transparent solution obtained by separ...

Example Embodiment

[0084] Example 2

[0085] The process of separating aluminum and iron by acidolysis and fractional precipitation of red mud includes the following steps:

[0086] (1) 1kg of red mud, 3kg of 80wt% sulfuric acid and 1kg of paraformaldehyde were reacted at 70°C for 12h to obtain a slurry;

[0087] (2) separating the slurry to obtain a reaction residue (first product) and an acidic solution;

[0088] (3) Add dropwise 10wt% sodium hydroxide aqueous solution in the solution, control the pH value at 4.5, obtain the off-white colloidal slurry, after centrifugation, obtain the corresponding colloidal precipitation and transparent solution;

[0089] Steps (4), (5) and (6) are the same as steps (5), (6) and (7) in Example 1 in turn.

[0090] The masses of the first product, the second product and the third product obtained in this example were 0.4kg, 0.3kg and 0.3kg respectively.

[0091] The composition of red mud and each product is as shown in Table 2 in this embodiment:

[0092] ...

Example Embodiment

[0104] Example 3

[0105] The process of separating aluminum and iron by acidolysis and fractional precipitation of red mud includes the following steps:

[0106] (1) React 1kg of red mud and 3kg of 30wt% hydrochloric acid at 130°C for 12h to obtain a slurry;

[0107] (2) Slurry is separated to obtain 0.3kg of reaction residue (first product) and acidic solution;

[0108] (3) Add 0.2kg of aluminum powder to the acidic solution, and the reaction is complete at 30°C, changing from a yellow solution to a green solution;

[0109] (4) Add dropwise 10wt% potassium hydroxide aqueous solution in the solution, control the pH value at 4.5, obtain the off-white colloidal slurry, after centrifugation, obtain the corresponding colloidal precipitation and transparent solution;

[0110] Steps (5), (6) and (7) are sequentially the same as steps (5), (6) and (7) in Example 1.

[0111] The masses of the first product, the second product and the third product obtained in this example were 0.3...

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Abstract

The invention provides a method for separating iron and aluminum from red mud and/or iron-containing solid waste. The method comprises the following steps: 1, carrying out acid leaching and reduction treatment on the red mud and/or iron-containing solid waste to obtain residue and reduction solution; and 2, sequentially adjusting pH of the reduction solution to a precipitation pH interval of trivalent aluminium ions and ferrous ions to separate aluminum and iron. The method is moderate in condition, low in equipment requirements and high in iron separating efficiency; in addition, the purity of an obtained ferric oxide product is high; and harmless and high valve treatment of a large amount of red mud and/or iron-containing solid waste can be realized, so that the method has powerful industrial application potential.

Description

technical field [0001] The invention belongs to the field of hazardous solid waste treatment and application, and relates to a method for separating iron and aluminum from red mud and / or iron-containing solid waste. Background technique [0002] Red mud is the polluting strong alkaline waste residue discharged when the aluminum industry extracts alumina. Generally, for every ton of alumina produced, 1.0-2.0 tons of red mud is incidentally produced. A large amount of red mud cannot be fully and effectively utilized, and can only be stacked in a large area of ​​storage yard, which occupies a large amount of land and causes serious pollution to the environment. Some countries have listed red mud as hazardous waste. The production of red mud has caused direct or indirect impacts on human production and life in many ways. Therefore, the stacking of red mud should be minimized and the recycling of red mud should be developed. It is imminent to broaden the resource utilization of ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B7/04C22B21/00C01G49/06B82Y40/00
CPCB82Y40/00C01G49/06C01P2004/64C01P2006/80C22B7/007C22B7/04C22B21/0023Y02P10/20
Inventor 余剑杨娟李长明郭凤
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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