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Method for preparing low-iron refractory brick base material and coproducing nano iron oxide by utilizing bauxite tailings

A technology of nano-iron oxide and bauxite, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, nanotechnology, etc., can solve the problems of large environmental pollution, weak iron removal effect, equipment corrosion, etc., and achieve good separation effect , Improve the load softening temperature and refractoriness, and reduce the effect of leaching temperature

Pending Publication Date: 2018-09-14
HUNAN CHEM VOCATIONAL TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is to provide a method for preparing low-iron refractory brick base material from bulk bauxite tailings by ultrasonic-assisted microbial treatment with short leaching period, less corrosion and less pollution, in order to solve the problems in the background technology. At present, the iron removal effect is weak, the equipment is seriously corroded, the environmental pollution is large, the cycle is long, and the comprehensive utilization of bauxite tailings iron removal is suitable for industrial applications and the consumption of bauxite tailings is low.

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  • Method for preparing low-iron refractory brick base material and coproducing nano iron oxide by utilizing bauxite tailings
  • Method for preparing low-iron refractory brick base material and coproducing nano iron oxide by utilizing bauxite tailings
  • Method for preparing low-iron refractory brick base material and coproducing nano iron oxide by utilizing bauxite tailings

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Embodiment 1

[0035] This embodiment provides a method for preparing low-iron refractory brick base material from bauxite tailings, see figure 1 , this embodiment includes the following steps:

[0036] S1. Pre-magnetic separation: firstly, the bauxite tailings slurry is pre-magnetically separated through a high-gradient magnetic separator, the feed concentration is 25%, the background field strength is 1.16T, the magnetic rod medium is Φ1mm, and the magnetic tailings and non-magnetic Aluminum concentrate separation;

[0037] S2. Ultrasonic enhanced mineral leaching: the power of the ultrasonic pulverizer is 200W, and the bio-acid leaching agent is added to the non-magnetic aluminum concentrate obtained in step 1, the liquid-solid ratio is 10:1, the leaching temperature is 25°C, the stirring speed is 200r / min, and the leaching time is After 30 minutes, the leach residue and leachate were obtained after pressure filtration;

[0038] S3. Roasting: cleaning the leached slag, and roasting the ...

Embodiment 2

[0046] This embodiment provides a method for preparing low-iron refractory brick base material from bauxite tailings, see figure 1 , this embodiment includes the following steps:

[0047] S1. Pre-magnetic separation: firstly, the bauxite tailings slurry is pre-magnetically separated through a high-gradient magnetic separator, the feed concentration is 30%, the background field strength is 1.0T, the magnetic rod medium is Φ1.5mm, and the magnetic tailings and Separation of non-magnetic aluminum concentrate;

[0048] S2. Ultrasonic enhanced mineral leaching: the power of the ultrasonic pulverizer is 150W, and the bio-acid leaching agent is added to the non-magnetic aluminum concentrate obtained in step 1, the liquid-solid ratio is 8:1, the leaching temperature is 30°C, the stirring speed is 150r / min, and the leaching time is 20min, then press filter to leach the suspension to obtain leach residue and leachate;

[0049] S3. Roasting: cleaning the leached slag, and roasting the ...

Embodiment 3

[0057] This embodiment provides a method for preparing low-iron refractory brick base material from bauxite tailings, see figure 1 , this embodiment includes the following steps:

[0058] S1. Pre-magnetic separation: firstly, pre-magnetic separation of bauxite tailings slurry through a high-gradient magnetic separator, the feed concentration is 35%, the background field strength is 0.8T, the magnetic rod medium is Φ2mm, and the magnetic tailings and non-magnetic Aluminum concentrate separation;

[0059] S2. Ultrasonic enhanced mineral leaching: the power of the ultrasonic pulverizer is 100W, and the bio-acid leaching agent is added to the non-magnetic aluminum concentrate obtained in step 1, the liquid-solid ratio is 5:1, the leaching temperature is 40°C, the stirring speed is 100r / min, and the leaching time is 15min, then press filter to leach the suspension to obtain leach residue and leachate;

[0060] S3. Roasting: wash the leached slag, and roast the washed leached slag a...

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Abstract

The invention discloses a method for preparing a low-iron refractory brick base material and coproducing nano iron oxide by utilizing bauxite tailings, and belongs to the field of comprehensive utilization of the bauxite tailings. According to the method disclosed by the invention, through a technological process of magnetic separation in advance-ultrasonic intensification on microbiological leachate: bauxite tailings-roasting of leach residue, the iron content in the leach residue of the bauxite tailings is selectively reduced to a large extent, so that the low-iron refractory brick base material is prepared; by virtue of ultrasonic dispersion and enrichment effects, the leachate is intensified and radiated through light, so that an ultrafine ferrous oxalate byproduct with high added value is obtained; finally, by roasting the obtained ultrafine ferrous oxalate in an oxygen flow, a high-value nano ferric oxide material can be further produced. Through the technological method disclosed by the invention, the refractoriness under load and the refractoriness of the prepared low-iron refractory brick are greatly increased, and black spots on a prepared product are reduced; meanwhile,large-amount consumption and resource utilization of aluminum industry residue of the bauxite tailings are realized, replaceable mineral resources of refractory clay are also increased, and the economic benefit, the social benefit and the economic benefit are important.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of bauxite tailings, and more specifically relates to a method for preparing low-iron refractory brick base material from bauxite tailings. Background technique [0002] Refractory clay is an advantageous resource in my country, but high-grade refractory clay accounts for less than 30% of the total reserves. In recent years, due to the vigorous development of my country's refractory materials, ceramics and other enterprises, domestic high-quality refractory clay has almost been excavated. The stock of high-quality refractory raw materials is also declining sharply. Therefore, while improving the production process to comprehensively utilize refractory clay, it is imminent to develop and utilize new alternative resources for refractory raw materials. Bauxite beneficiation tailings are solid waste produced by the process of "mineral processing - Bayer process to produce alumina" generally ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622C01G49/06B82Y40/00
CPCB82Y40/00C01G49/06C01P2002/72C01P2004/03C01P2004/16C01P2004/64C01P2006/80C04B35/62204C04B35/66
Inventor 曹慧君徐祥斌李继睿刘志勇
Owner HUNAN CHEM VOCATIONAL TECH COLLEGE
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