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Active bauxite dressing tailing micro-powder, and preparation method thereof

A technology of activated bauxite and tailings micro-powder, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of inapplicable bauxite beneficiation and tailings activation, and achieve a simple and easy preparation method , the effect of solving discharge and stockpiling problems

Active Publication Date: 2011-11-23
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical composition, mineral composition and other physical and chemical properties of bauxite dressing tailings are completely different from those of slag, kaolin, and fly ash, so their preparation methods or activation methods are not suitable for the processing of bauxite dressing tailings. activation

Method used

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  • Active bauxite dressing tailing micro-powder, and preparation method thereof
  • Active bauxite dressing tailing micro-powder, and preparation method thereof
  • Active bauxite dressing tailing micro-powder, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Determination of lime content in bauxite dressing tailings

[0035] Calcinate 100 kg of bauxite tailings at 800°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through a 80 μm square hole sieve, and mix 15 wt% of Slag fine powder, obtained powder A-1.

[0036] Mix 98 kg of bauxite tailings with 2 kg of lime evenly, calcinate at 800°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through an 80 μm square hole sieve, and the sieve residue is in the range of 10.0% Inside, 15wt% of slag fine powder was added to obtain powder A-2.

[0037] Mix 96 kg of bauxite tailings with 4 kg of lime evenly, calcinate at 800°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through a 80 μm square hole sieve, and the sieve residue is in the range of 10.0% Inside, 15wt% of slag fine powder was added to obtain powder...

Embodiment 2

[0046] Example 2: Preparation of active micropowder by mixing fly ash in bauxite dressing tailings

[0047] Calcinate 100kg of bauxite tailings at 850°C for 1.0 hour and 30 minutes, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through a 80μm square hole sieve, and mix 15wt % of slag powder, the resulting powder B-1.

[0048] Mix 98 kg of bauxite tailings with 2 kg of fly ash evenly, calcinate at 850°C for 1.0 hour and 30 minutes, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through an 80μm square hole sieve, and sieve the remaining In the range of 10.0%, 15wt% of slag fine powder was added to obtain powder B-2.

[0049] Mix 88 kg of bauxite tailings with 12 kg of fly ash evenly, calcinate at 850°C for 1.0 hour and 30 minutes, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through an 80μm square hole sieve, and sieve the remaining In the range of 10.0%, ...

Embodiment 3

[0055] Embodiment 3: the control of calcining temperature

[0056] Mix 96 kg of bauxite tailings with 4 kg of lime evenly, calcinate at 700°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through a 80 μm square hole sieve, and the sieve residue is in the range of 10.0% Inside, 15wt% of slag fine powder was added to obtain powder C-1.

[0057] Mix 96 kg of bauxite tailings with 4 kg of lime evenly, calcinate at 800°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through a 80 μm square hole sieve, and the sieve residue is in the range of 10.0% Inside, 15wt% of slag fine powder was added to obtain powder C-2.

[0058] Mix 96 kg of bauxite tailings with 4 kg of lime evenly, calcinate at 900°C for 1.0 hour, cool down to room temperature naturally, take it out and grind it in a ball mill, pass through an 80 μm square hole sieve, and the sieve residue is in the range of 10.0...

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Abstract

The invention discloses an active bauxite dressing tailing micro-powder, a preparation method thereof, and an application thereof. The invention belongs to the field of waste recycling. The active micro-powder is prepared through the steps that: 70 to 98wt% of bauxite dressing tailing and 2 to 30wt% of fly ash are mixed, or 92 to 98 wt% of bauxite dressing tailing and 2 to 8wt% of lime are mixed;the mixture are calcined at a temperature of 700 to 900 DEG C, and is grinded, such that a finished product is obtained. The micro-powder also can be prepared from grinded material of a mixture of calcined bauxite dressing tailing and lime. The micro-powder can be used as a preparation raw material of alkali-activated cement, or high active mixing material of composite portland cement. According to the invention, an activation treatment is carried out upon bauxite dressing tailing, which is presently a waste. The method assists in solving discharging and storing problems of bauxite dressing tailing, and provides a precondition for utilizing the resource in the field of cementing materials.

Description

technical field [0001] The invention relates to the reuse of industrial waste, in particular to a method for activating bauxite dressing tailings discharged from the alumina industry. Background technique [0002] Constrained by the shortage of high-grade bauxite resources and the rapid development of the aluminum industry, domestic aluminum companies must further vigorously promote the application of beneficiation-Bayer process to produce alumina in order to utilize low-grade bauxite resources in large quantities. However, this process generally yields about 22% of the bauxite tailings. As we all know, the discharge and stockpiling of red mud has been a major problem that my country's aluminum companies are eager to solve for many years. At present, bauxite dressing tailings are evolving into the second type of "red mud" in the aluminum industry, but its management cost exceeds that of red mud. mud. Because the tailings of consolidated bauxite need to be mixed with cement,...

Claims

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Application Information

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IPC IPC(8): C04B18/12
CPCC04B18/023Y02W30/91C04B18/12C04B22/064C04B14/303
Inventor 张文生叶家元王宏霞王渊董刚汪智勇吴春丽
Owner CHINA BUILDING MATERIALS ACAD
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