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Method for preparing fine ore from bauxite

A bauxite and fine powder technology, applied in chemical instruments and methods, aluminum compounds, alumina/aluminum hydroxide, etc., can solve the problems of increasing alumina alkali consumption, evaporation energy consumption, high sulfur content and organic content, Increase production costs and other issues, to achieve the effect of reducing flocculant consumption, reducing production alkali consumption, and reducing production costs

Pending Publication Date: 2022-01-04
ZUNYI ENERGY & MINERAL INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high moisture content, high sulfur content and organic matter content of mining raw ore mixed ore and flotation desulfurization concentrate will greatly increase the alkali consumption and evaporation energy consumption of alumina production, thereby increasing production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A bauxite ore product and a preparation method thereof, comprising the following steps:

[0024] (1) Drying the bauxite ore to reduce its moisture content to below 5% to obtain dry lump ore;

[0025] (2) Grinding the dry block ore obtained in step (1), so that the ore fineness reaches 100 μm and accounts for 75%, obtaining the original powder ore;

[0026] (3) The raw powder ore obtained in step (2) is preheated in a low-temperature system at 300°C and roasted in a medium-high temperature system at 600°C in sequence to remove harmful components such as moisture, sulfur, and organic carbon, and improve oxidation efficiency. aluminum grade, to obtain fine powder ore.

Embodiment 2

[0028] A bauxite ore product and a preparation method thereof, comprising the following steps:

[0029] (1) Drying the bauxite ore to reduce its moisture content to below 5% to obtain dry lump ore;

[0030] (2) Grinding the dry block ore obtained in step (1), so that the ore fineness reaches 100 μm and accounts for 75%, obtaining the original powder ore;

[0031] (3) The raw powder ore obtained in step (2) is preheated in a low-temperature system at 350°C and roasted in a medium-high temperature system at 800°C in sequence to remove harmful components such as moisture, sulfur, and organic carbon, and improve oxidation efficiency. aluminum grade, to obtain fine powder ore.

Embodiment 3

[0033] A bauxite ore product and a preparation method thereof, comprising the following steps:

[0034] (1) Drying the bauxite ore to reduce its moisture content to below 5% to obtain dry lump ore;

[0035] (2) Grinding the dry block ore obtained in step (1) so that the ore fineness reaches 100 μm and accounts for 80%, obtaining the original powder ore;

[0036] (3) The raw powder ore obtained in step (2) is preheated in a low-temperature system at 400°C and roasted in a medium-high temperature system at 950°C in sequence to remove harmful components such as moisture, sulfur, and organic carbon, and improve oxidation efficiency. aluminum grade, to obtain fine powder ore.

[0037] The main components of the fine powder ore obtained in the above-mentioned embodiments 1-3 are in weight percentage: Al 2 o 3 52~67%, SiO 2 10-17%, sulfur 0.01-0.1%, moisture less than 0.1%, organic carbon content 0.2-0.3%

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Abstract

The invention belongs to the technical field of bauxite preparation, and particularly relates to a method for preparing fine ore from bauxite. The method comprises the following steps: (1) drying bauxite ore to reduce the moisture content of the bauxite ore to 5% or below to obtain dry lump ore; (2) grinding the dry lump ore obtained in step (1) until the ore with the fineness of 100 microns accounts for 70-80% to obtain raw fine ore; and (3) preheating the raw fine ore obtained in step (2) in a low-temperature system of 300-400 DEG C and roasting the raw fine ore in a medium-high-temperature system of 600-950 DEG C in sequence to remove moisture, sulfur and organic carbon in the raw fine ore so as to obtain the fine ore. The preparation method disclosed by the invention is simple in flow and easy to operate and manage, and various impurities in the ore can be quickly and synchronously removed, so that the quality of an ore product is improved.

Description

technical field [0001] The invention belongs to the technical field of bauxite preparation, in particular to a method for preparing fine powder ore from bauxite. Background technique [0002] 90% of my country's bauxite is used as raw material for alumina production. With the continuous development and utilization of bauxite resources, shallow low-sulfur bauxite has tended to be exhausted. Currently, most of the bauxite purchased by alumina plants is low-sulfur Compound ore or flotation desulfurization concentrate of sulfur raw ore and high sulfur raw ore. However, the high moisture content, high sulfur content and organic matter content of raw ore mixed ore and flotation desulfurization concentrate will greatly increase the alkali consumption and evaporation energy consumption of alumina production, thereby increasing production costs. Contents of the invention [0003] The purpose of the present invention is to provide a method for preparing high-quality bauxite concentr...

Claims

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Application Information

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IPC IPC(8): C01F7/02
CPCC01F7/023C01F7/021C01F7/02
Inventor 周剑飞何伟石治均程小春周颖
Owner ZUNYI ENERGY & MINERAL INVESTMENT CO LTD
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