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Process for treating bauxite physical enrichment residues

A technology of mineral physics and bauxite, applied in the fields of aluminum compounds, chemical instruments and methods, preparation of alkali metal aluminates/alumina/aluminum hydroxide, etc., which can solve the problems of no recycling options and the inability to extract aluminum in an economical way.

Pending Publication Date: 2021-12-07
IB2公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It includes not only silicon in different mineral forms, but also aluminum, but this aluminum cannot be extracted in a viable and economical way by any known industrial method
These residues are therefore, according to the state of the art, final waste that must be disposed of in landfill; they are added to the Bayer process residue (known as "red mud"), which also does not have sufficient capacity for recycling options, and Must also be stored in landfill in most cases

Method used

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  • Process for treating bauxite physical enrichment residues
  • Process for treating bauxite physical enrichment residues
  • Process for treating bauxite physical enrichment residues

Examples

Experimental program
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Effect test

Embodiment

[0184] 1) Residue selection and analysis

[0185] Four batches of bauxite (labeled A, B, C and D) were subjected to one or the other of two physical enrichment methods; these physical enrichment methods applied to these batches of bauxite The set method is an industrial method known to those skilled in the art.

[0186] According to the first method of physical enrichment, the bauxite is crushed and then wet sieved on a vibrating screen. The finest particles with a very high silica concentration are carried away by the wash water and are excluded; the rest form residues (residues A, B and C) which will then be processed by the method according to the invention.

[0187] According to the second physical enrichment method, finely ground bauxite (average particle size about 200 μm) is subjected to flotation using chemical auxiliaries to adsorb the target minerals found in the floating material at that time, so as to be separated from the The mineral residue (residue D) is sep...

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PUM

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Abstract

Process for manufacturing alumina trihydrate or alumina from a bauxite physical enrichment residue, said physical enrichment residue having been pretreated by a process comprising calcining (2020) and leaching (2030), in order to obtain a residue referred to as pretreated, said process comprising the steps of: digesting (2120) said pretreated residue with an aqueous solution of soda at a temperature of at least 100 DEG C, said aqueous solution of soda having a concentration of between 100 g Na2O / L and 220 g Na2O / L; separating (2130) the solid residue from the liquid phase; crystallizing the aluminium trihydrate (2160) by addition of seeds (2170); separating (2180) the crystallized aluminium trihydrate from the liquid phase, optionally, calcining (2194) said aluminium trihydrate in order to obtain alumina (2196).

Description

technical field [0001] The present invention relates to the field of mineral processing, in particular to physical and chemical processing of bauxite. The invention particularly relates to the recovery of bauxite physical enrichment residues. The physical enrichment of bauxite is understood to mean in particular the washing screening and flotation methods which are used industrially to separate finely divided bauxite from certain fractions which cannot be recovered by the Bayer process. These non-recyclable parts still contain aluminum, but cannot be extracted economically. [0002] The present invention relates to a method for treating these residues of physical enrichment of bauxites, which makes it possible to extract part of the aluminum contained in these residues which can be treated chemically. In this method, the residue is first preheated, followed by leaching, and the pretreated residue is used in the Bayer process to extract aluminum in the form of aluminum trihyd...

Claims

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Application Information

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IPC IPC(8): C01F7/06C01F7/062C01F7/0613C01F7/0693
CPCC01F7/062C01F7/0693C01F7/0613Y02P10/20
Inventor 伊夫·奥切洛
Owner IB2公司
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