Method for preparing iron powder through red mud suspension roasting

A technology of suspension roasting and iron concentrate powder, which is applied in the field of mineral processing, can solve the problems of inability to realize resource utilization of red mud, inability to effectively separate alumina and iron minerals, and low separation efficiency

Active Publication Date: 2018-02-13
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, strong magnetic separation or conventional flotation is mostly used to separate iron minerals, and the separation efficiency is very low. It cannot effectively separate alumina and iron minerals, and cannot realize red mud resource utilization.

Method used

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  • Method for preparing iron powder through red mud suspension roasting
  • Method for preparing iron powder through red mud suspension roasting
  • Method for preparing iron powder through red mud suspension roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The iron grade TFe of red mud is 26%, containing Al by weight percentage 2 o 3 18%, SiO 2 11%, Na 2 O 1.2%;

[0028] Process such as figure 1 shown;

[0029] Grind the red mud until the particle size -200 mesh accounts for 65% of the total weight to obtain red mud ore powder; subject the red mud ore powder to a stage of weak magnetic separation with a magnetic field strength of 600Oe to obtain a stage of weak magnetic separation concentrate and a stage of Weak magnetic separation tailings;

[0030] A section of weak magnetic separation tailings is subjected to strong magnetic separation with a magnetic field strength of 6000Oe to obtain strong magnetic separation concentrate and strong magnetic separation tailings; a section of weak magnetic separation concentrate and strong magnetic separation concentrate are mixed as pre-enrichment concentrate mine;

[0031] Put the pre-enriched concentrate in the oxidation roasting furnace, feed gas and air to keep the pre-e...

Embodiment 2

[0036] The iron grade TFe of red mud is 47%, containing Al by weight percentage 2 o 3 13%, SiO 2 3%, Na 2 O 0.5%;

[0037] Method is with embodiment 1, and difference is:

[0038] (1) Grinding the red mud to a particle size of -200 mesh accounts for 60% of the total weight, and the magnetic field strength of a section of weak magnetic separation is 1000Oe;

[0039] (2) The magnetic field intensity of strong magnetic separation is 8000Oe;

[0040] (3) The temperature of oxidation roasting is 950℃, the time is 5min, and the flow rate of gas and air is 25m per ton of pre-enriched concentrate. 3 / h;

[0041] (4) The temperature of reduction roasting is 750°C, the time is 2min, and the reducing gas is H 2 , the flow rate of reducing gas is H 2 The total amount is 15m 3 / h; the ratio of nitrogen and reducing gas is 3:1;

[0042] (5) Grinding the roasted ore until the particle size-400 mesh accounts for 60% of the total weight, the magnetic field strength of the second stag...

Embodiment 3

[0044] The iron grade TFe of red mud is 38%, containing Al by weight percentage 2 o 3 15%, SiO 2 9%, Na 2 O 0.9%;

[0045] Method is with embodiment 1, and difference is:

[0046] (1) Grinding the red mud to a particle size of -200 mesh accounts for 70% of the total weight, and the magnetic field strength of a section of weak magnetic separation is 1500Oe;

[0047] (2) The magnetic field intensity of strong magnetic separation is 9000Oe;

[0048] (3) The temperature of oxidative roasting is 850°C and the time is 15min, and the flow rate of gas and air is 15m per ton of pre-enriched concentrate. 3 / h;

[0049] (4) The temperature of reduction roasting is 550°C, the time is 8min, the reduction gas is coal gas, and the flow rate of reduction gas is based on the amount of CO and H introduced per ton of oxidized ore powder. 2 The total amount is 10m 3 / h; the ratio of nitrogen and reducing gas is 4:1;

[0050] (5) Grinding the roasted ore until the particle size-400 mesh...

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Abstract

The invention discloses a method for preparing iron powder through red mud suspension roasting, and belongs to the technical field of mineral processing. The method comprises following steps: firstly,red mud is subject to fine grinding and then subject to one-segment weak magnetic separation; secondly, one-segment weak magnetic separation tailings is subject to strong magnetic separation, and one-segment weak magnetic concentrate and strong magnetic concentrate are mixed to serve as preconcentration concentrate; thirdly, the preconcentration concentrate is placed in an oxidizing roaster, gasand air are led, and the preconcentration concentrate is subject to oxide roasting to obtain oxide powder ore; fourthly, the oxide powder ore is placed in a reduction roaster, nitrogen and reduction gas are led, and reduction roasting is carried out; fifthly, the roasted ore is subject to fine grinding, and then, second-segment weak magnetic separation is carried out. The method is simple in process flow, the equipment treatment amount is large, the product character is easily controlled, industrial application is achieved, the method is energy-saving and environment-friendly, and enlargementis easily achieved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for preparing iron fine powder by suspending and roasting red mud. Background technique [0002] Red mud is the main waste residue produced in the alumina production process. Its existence not only occupies a large amount of land and increases maintenance costs, but also the alkaline substances in red mud pollute the environment, destroy the soil structure, pollute the groundwater, and seriously endanger the people's health. If the recycling of red mud can be realized, it will not only save resources and reduce environmental pollution, but also have certain social significance. In addition, with the development of my country's iron and steel smelting industry, the raw material iron ore is increasingly depleted. If the iron in the red mud can be effectively used, the pressure of the shortage of iron ore resources in the iron and steel industry will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02B22F9/22
CPCB22F9/22C22B1/02
Inventor 韩跃新袁帅李艳军高鹏
Owner NORTHEASTERN UNIV LIAONING
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