A method for separating aluminum and iron by suspension roasting of high-iron bauxite

A high-iron bauxite and suspension roasting technology is applied in the field of suspension roasting of high-iron bauxite to separate aluminum and iron, and can solve the problems of inability to popularize and apply, low separation efficiency, and inability to effectively separate aluminum and iron.

Active Publication Date: 2019-06-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, strong magnetic separation is used to separate iron minerals, or flotation is used to separate iron minerals, but conventional magnetic separation and flotation can only be used for single-type high-iron iron minerals composed of magnetite or hematite Bauxite, and the separation efficiency is very low, cannot effectively separate aluminum and iron, and cannot be popularized and applied

Method used

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  • A method for separating aluminum and iron by suspension roasting of high-iron bauxite
  • A method for separating aluminum and iron by suspension roasting of high-iron bauxite
  • A method for separating aluminum and iron by suspension roasting of high-iron bauxite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Process such as figure 1 shown;

[0030] Crushing the high-iron bauxite to a particle size of 5-20mm, and then grinding the ore to a particle size of -0.074mm accounts for 50% of the total weight;

[0031] The ore powder is subjected to a stage of weak magnetic separation, with a magnetic field strength of 1000Oe, to obtain a stage of magnetic separation concentrate and a stage of magnetic separation tailings;

[0032] Put a section of magnetic separation tailings in a roasting furnace, feed gas and air, make a section of magnetic separation tailings in a suspended state, and oxidize and roast at 800°C for 20 minutes to convert iron minerals into Fe 2 o 3 , and remove water and other volatile matter to obtain oxidized ore powder; the flow rate of air and gas is 15m per ton of magnetic separation tailings 3 / h; oxidation process such as figure 2 shown;

[0033] Using a reduction roaster, the structure is as follows image 3 As shown, the housing is equipped with a...

Embodiment 2

[0038] Method is with embodiment 1, and difference is:

[0039] (1) crushing the high-iron bauxite to a particle size of 5-20 mm, and then grinding the ore to a particle size of -0.074 mm to account for 60% of the total weight;

[0040] (2) The magnetic field strength of a section of weak magnetic separation is 2000Oe;

[0041](3) Carry out oxidative roasting at 950°C for 5 minutes, and the flow rate of air and gas is 20m per ton of first-stage magnetic separation tailings. 3 / h;

[0042] (4) The reduction roasting temperature is 700°C, the time is 3min, and the reducing gas is H 2 , the flow rate of reducing gas is H 2 The total amount is 5m 3 / h; the ratio of nitrogen and reducing gas is 5:1;

[0043] (5) The magnetic field strength of the second section of weak magnetic separation is 2000Oe, and the magnetic field strength of strong magnetic separation is 10000Oe;

[0044] (6) the iron grade TFe of the high-iron bauxite that adopts is 28%, contains Al by weight percen...

Embodiment 3

[0046] Method is with embodiment 1, and difference is:

[0047] (1) crushing the high-iron bauxite to a particle size of 5-20 mm, and then grinding the ore to a particle size of -0.038 mm, accounting for 80% of the total weight;

[0048] (2) The magnetic field strength of a section of weak magnetic separation is 1400Oe;

[0049] (3) Oxidize and roast at 850°C for 15 minutes, and the flow rate of air and gas is 5m per ton of magnetic separation tailings. 3 / h;

[0050] (4) The reduction roasting temperature is 500°C, the time is 8 minutes, the reduction gas is coal gas, and the flow rate of the reduction gas is based on the amount of CO and H introduced per ton of oxidized ore powder. 2 The total amount is 15m 3 / h; the ratio of nitrogen and reducing gas is 3:1;

[0051] (5) The magnetic field strength of the second stage of weak magnetic separation is 1400Oe, and the magnetic field strength of strong magnetic separation is 6000Oe;

[0052] (6) The iron grade TFe of the hi...

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Abstract

The invention belongs to the technical field of mineral processing, and discloses a method for separating aluminum and iron through suspension roasting for high-iron bauxite. The method comprises thefollowing steps that (1) the high-iron bauxite is crushed and levigated; (2) first-stage low intensity magnetic separation is carried out; (3) first-stage magnetic separation tailings are subjected tooxidizing roasting; (4) oxidation fine ore is put into a reduction roasting furnace for reduction roasting; (5) reduced fine ore is subjected to second-stage low intensity magnetic separation; and (6) second-stage magnetic separation tailings are subjected to strong magnetic separation, and strong magnetic separation concentrates and second-stage low intensity magnetic separation concentrates arecombined into finished iron concentrates. The method is simple in technological process and large in equipment handling capacity, the product properties are easy to control, energy saving and environment protection are achieved during industrial application, and enlargement is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for separating aluminum and iron by suspension roasting of high-iron bauxite. Background technique [0002] my country's high-quality bauxite resources are increasingly scarce due to the huge consumption of the alumina industry. However, there are a large number of high-iron bauxite resources with high iron content in my country that have not yet been effectively utilized on a large scale. The bauxite minerals in the high-iron bauxite resources are mainly gibbsite and diaspore, and the iron minerals are mainly Hematite, goethite, limonite, siderite, etc., realize the effective utilization of iron and aluminum resources in high-iron bauxite, which is of great significance to alleviate the shortage of self-produced iron and aluminum ore in my country. However, due to the different diagenetic types and origins of high-iron bauxite, there are many differences in p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 韩跃新袁帅李艳军高鹏
Owner NORTHEASTERN UNIV LIAONING
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