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Method for circularly extracting metal oxide

A recycling extraction and oxide technology, which is applied in the direction of boron oxide, boron oxide compound, process efficiency improvement, etc., can solve the problems that the production cost of alumina is greatly affected, and it is not suitable for processing low-grade bauxite aluminum resources. Achieve high-efficiency leaching and high extraction rate

Inactive Publication Date: 2020-11-20
SHENYANG POLYTECHNIC UNIV
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Problems solved by technology

Because the ore grade (ore aluminum-silicon ratio) has a great influence on the current alumina production cost, the existing methods are not suitable for processing low-grade bauxite or aluminum resources

Method used

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  • Method for circularly extracting metal oxide
  • Method for circularly extracting metal oxide
  • Method for circularly extracting metal oxide

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Embodiment Construction

[0033] like figure 1 Shown, a kind of method for circularly extracting metal oxide comprises the following steps:

[0034] 1) The metal oxide is represented by MeO, and the acid is represented by HB. Mix the minerals containing metal oxides with the acid, and add them to the acid-resistant reaction kettle for reaction; the reaction temperature is 25-200°C, and the reaction time is 5-180min. The acid concentration is 5%~98%, the hydrogen ions (H + ) to metal oxides in a molar ratio of 2 to 9; minerals containing metal oxides (expressed in MeO) include but are not limited to aluminum minerals (bauxite, fly ash, coal gangue, alunite, aluminum ash), nickel Minerals (nickel laterite), magnesium minerals (magnesite, serpentine, dolomite, boronite), etc.;

[0035] 2) Solid-liquid separation and washing are carried out after the reaction cools down to obtain a metal salt solution and high-silicon slag, the metal salt is represented by MeB, and the separation of the metal salt and si...

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Abstract

The invention relates to a method for circularly extracting metal oxide. The method comprises the steps of mixing minerals containing metal oxides with acid to obtain a mixture, and adding the mixtureinto an acid-resistant reaction kettle for reaction; carrying out solid-liquid separation and washing to obtain a metal salt solution and high-silicon slag; adding the obtained metal salt solution into an alkali solution for neutralization to obtain a metal hydroxide precipitate and a salt solution, and then carrying out solid-liquid separation and washing to wash the metal hydroxide until the metal hydroxide is neutral; collecting the obtained metal hydroxide as a product for extracting the metal oxide; separating the obtained salt solution through an electric membrane to obtain an acid solution and an alkali solution; returning the alkaline solution from the membrane electrolysis cathode area to the front steps for recycling; and concentrating the acid solution coming out of the membrane electrolysis anode area directly or through evaporation, and returning to start the recycling. According to the method, no auxiliary agent is added, so that the metal oxide in low-grade material isefficiently and effectively leached, and the extraction rate is high; and the circulation of the salt material is realized, and the discharge of waste gas, waste liquid and waste residue is avoided.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of metal oxides, in particular to a method for circularly extracting metal oxides. Background technique [0002] Metal elements in ores mainly exist in the form of oxides, such as bauxite, nickel laterite, iron ore, magnesite, etc. are all ores that mainly exist in metal oxides; a small amount of metal elements in ores exist in the form of sulfides, such as Pyrite, nickel sulfide ore, etc. are all ores that mainly exist in the form of sulfide. The extraction methods of metal elements mainly include wet method and fire method. The wet method is to make metal elements enter the solution by heating or pressurizing in acid solution or alkali solution system, so as to achieve the purpose of separating metal elements and impurities. The fire method is to sinter the ingredients to make the metal elements form soluble salts, and then dissolve the metal elements and impurities. For example, alumi...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/08C22B3/10C22B3/44C22B21/00C22B26/22C22B23/00C01B35/10
CPCC01B35/1027C22B3/065C22B3/08C22B3/10C22B3/44C22B21/0015C22B23/0423C22B23/043C22B23/0438C22B23/0461C22B26/22Y02P10/20
Inventor 李来时吴玉胜
Owner SHENYANG POLYTECHNIC UNIV
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