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A method for enriching scandium and titanium from aluminum-melting slag and recovering silicon-aluminum sodium

A technology for dissolving and enriching aluminum, which is applied in the field of enriching scandium and titanium from aluminum-dissolving slag and recovering silicon-aluminum sodium, can solve the problems of low titanium recovery rate, etc. Effect

Active Publication Date: 2019-09-20
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Chinese patents CN106884097A, CN106987723A and CN106987724A disclose the method of using concentrated sulfuric acid selective acid leaching to enrich titanium, recycle aluminum, and solidify silicon respectively. , scandium and aluminum enter the leaching solution, silicon enters the residue, add ammonia water to the leaching solution to precipitate aluminum, add ammonia water to the solution after aluminum precipitation to adjust the pH value, and obtain titanium-rich alkali slag, which is obtained after drying and roasting. The recovery rate of titanium is less than 60%

Method used

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  • A method for enriching scandium and titanium from aluminum-melting slag and recovering silicon-aluminum sodium
  • A method for enriching scandium and titanium from aluminum-melting slag and recovering silicon-aluminum sodium

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Experimental program
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Effect test

Embodiment 1

[0033] ① Dry and finely grind the aluminum-dissolving slag until it is passed through a sample sieve to obtain a solid powder with a particle size of less than 74 μm. Use dilute sulfuric acid to selectively leach the aluminum-dissolving slag. The leaching conditions are: the mass fraction of the dilute sulfuric acid solution is 12%, and the reaction temperature is The temperature is 25°C, the reaction time is 60min, the liquid-solid ratio is 8:1mL / g, and the stirring speed is 400r / min;

[0034] ② Separating the slurry obtained in step ① into solid and liquid to obtain leaching residue and leaching solution; the leaching rate of silicon in the leaching solution was 92%, the leaching rate of aluminum was 78.22%, and the leaching rate of sodium was 97.33%;

[0035] ③Wash the leached slag obtained in step ② with distilled water, and dry at 120°C to obtain scandium-rich titanium slag; TiO in scandium-rich titanium slag 2 The content of Sc is 44.08%, and the content of Sc is 0.020%....

Embodiment 2

[0041]①Dry and finely grind the aluminum-dissolving slag until it is passed through a sample sieve to obtain a solid powder with a particle size of less than 74 μm, and use dilute sulfuric acid to selectively leach the aluminum-dissolving slag. The leaching conditions are: the mass fraction of the dilute sulfuric acid solution is 8%, and the reaction temperature The temperature is 95°C, the reaction time is 60min, the liquid-solid ratio is 7:1mL / g, and the stirring speed is 500r / min;

[0042] ② Separating the slurry obtained in step ① into solid and liquid to obtain leaching residue and leaching solution; in the leaching solution, the silicon leaching rate was 57.25%, the aluminum leaching rate was 56.22%, and the sodium leaching rate was 93.5%;

[0043] ③Wash the leached slag obtained in step ② with distilled water, and dry at 120°C to obtain scandium-rich titanium slag; TiO in scandium-rich titanium slag 2 The content of Sc is 29.48%, and the content of Sc is 0.014%.

[004...

Embodiment 3

[0049] ①Dry and finely grind the aluminum-dissolving slag until it is passed through a sample sieve to obtain a solid powder with a particle size of less than 74 μm, and use dilute sulfuric acid to selectively leach the aluminum-dissolving slag. The leaching conditions are: the mass fraction of the dilute sulfuric acid solution is 16%, and the reaction temperature The temperature is 35°C, the reaction time is 15min, the liquid-solid ratio is 6:1mL / g, and the stirring speed is 300r / min;

[0050] ② Separating the slurry obtained in step ① into solid and liquid to obtain leaching residue and leaching solution; the leaching rate of silicon in the leaching solution was 94.23%, the leaching rate of aluminum was 82.21%, and the leaching rate of sodium was 97.43%;

[0051] ③Wash the leached slag obtained in step ② with distilled water, and dry at 120°C to obtain scandium-rich titanium slag; TiO in scandium-rich titanium slag 2 The content of Sc is 34.20%, and the content of Sc is 0.01...

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Abstract

The invention discloses a method for enriching scandium and titanium and recovering silicon, aluminum and sodium from soluble aluminum slags. The method comprises the steps that the aluminum-soluble slags obtained by dissolving the aluminum out from complex titanium-aluminum-contained concentrates under the high-temperature, high-pressure and high-concentration NaOH condition serve as a raw material, and selective leaching is carried out by adopting dilute sulfuric acid so as to obtain leached residues and leached liquor; the leached residues are washed and dried so as to obtain scandium-titanium-rich slags; the leached liquor is kept static for a certain time under the room temperature condition so as to form gel, and the gel is washed and filtered so as to obtain silicone gel and a solution containing the aluminum and the sodium; the silicone gel is dried and roasted so as to obtain silica gel; and the solution containing the aluminum and the sodium is subjected to evaporation and crystallization so as to obtain aluminium sodium sulfate. The method has the advantages that the silicon, the aluminum and the sodium can be dissolved out, the scandium and the titanium are left in theslags to be enriched, scandium and titanium resources in the aluminum-soluble slags can be efficiently enriched, the silicon, the aluminum and the sodium can be comprehensively recovered, and therefore the comprehensive utilization rate of the aluminum-soluble slags can be increased, the technological process is short, the method is simple and easy to operate, the cost is low, environmental pollution can be avoided, and large-scale resource utilization of the aluminum-soluble slags is expected to realize.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization and mineral resource processing, and in particular relates to a method for enriching scandium and titanium from aluminum-dissolving slag and recovering silicon-aluminum sodium. Background technique [0002] The super-large polymetallic pyrite discovered in a certain area of ​​Guangxi has a total proven resource of more than 200 million tons, and is associated with abundant associated components such as aluminum, titanium, scandium, gallium, niobium and rare earth elements. The aluminum concentrate obtained from pyrite after mineral processing has the characteristics of low iron and high aluminum, in which aluminum mainly exists in the form of diaspore, while scandium and titanium are enriched in the aluminum concentrate. [0003] Chinese patent CN107140665A discloses a method for stripping complex titanium-containing aluminum concentrates. In this method, high-concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C01F7/76C01B33/16
CPCC01B33/16C01F7/762C22B7/007C22B7/04Y02P10/20
Inventor 李新生韦悦周高锋孟凡悦张继豪王盼盼
Owner GUANGXI UNIV