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Method for preparing double-90 white filler from bauxite tailing

A technology of white filler and bauxite, applied in fibrous fillers, chemical instruments and methods, inorganic pigment treatment, etc., can solve problems such as limited application fields, and achieve the effects of expanding application range, good economic benefits, and high returns

Inactive Publication Date: 2012-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lu Qinghua et al. [invention patent application number 201010022086.X] used phosphoric acid to react with iron on the surface of tailings particles to generate white iron phosphate to improve the whiteness of tailings. However, the maximum whiteness value obtained by this method is about 86%. , and the powder fineness only reaches 10 μm, which limits its application field
At present, there is no relevant research report on the preparation of "Double 90" (ie -2μm particle size > 90% and whiteness > 90%) high-grade white fillers by using bauxite beneficiation tailings

Method used

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  • Method for preparing double-90 white filler from bauxite tailing
  • Method for preparing double-90 white filler from bauxite tailing
  • Method for preparing double-90 white filler from bauxite tailing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] (1) 50Kg of bauxite beneficiation tailings and 100Kg of sulfuric acid (70wt%) were stirred and mixed uniformly in a reactor, and heated and reacted at 200° C. for 12 hours.

[0031] (2) Mix the reacted pulp with 50Kg of water, adjust the pH to 2.5, add 750g of sodium dithionite, react at 25°C for 24 hours, and filter to obtain the slime filter cake after the reaction.

[0032] (3) Grinding in a sand mill after mixing the slime filter cake with water, the grinding conditions are: the slurry concentration is 50%, the rotating speed is 820 rpm, the grinding medium adopts zirconia balls, and the ball-to-material ratio is 5:1, Ball milling for 8 hours; use a disc centrifugal classifier to classify the overflow product with -2μm>90%; use a spray dryer to dry the overflow product. The drying conditions are: the concentration of the feed slurry is controlled at 50%, and the inlet temperature is 400°C, the outlet air temperature is 100°C.

[0033] (4) Fluidized roasting is carr...

example 2

[0036] (1) 50Kg of bauxite beneficiation tailings and 50Kg of sulfuric acid (70wt%) were stirred and mixed uniformly in a reactor, and heated and reacted at 200° C. for 12 hours.

[0037] (2) Mix the reacted pulp with 100Kg water, adjust the pH=2.5, add 750g sodium dithionite, react at 25°C for 24 hours, and filter to obtain the slime filter cake after the reaction is completed.

[0038] (3) Grinding in a sand mill after mixing the slime filter cake with water, the grinding conditions are: the slurry concentration is 50%, the rotating speed is 820 rpm, the grinding medium adopts zirconia balls, and the ball-to-material ratio is 5:1, Ball milling for 8 hours; use a disc centrifugal classifier to classify the overflow product with -2μm>90%; use a spray dryer to dry the overflow product. The drying conditions are: the concentration of the feed slurry is controlled at 50%, and the inlet temperature is 400°C, the outlet air temperature is 100°C.

[0039] (4) Fluidized roasting is ...

example 3

[0042] (1) 50Kg of bauxite beneficiation tailings and 75Kg of sulfuric acid (70wt%) were stirred and mixed uniformly in a reactor, and heated and reacted at 200° C. for 12 hours.

[0043] (2) Mix the reacted pulp with 75Kg water, adjust pH=2.5, add 750g sodium dithionite, react at 25°C for 24 hours, filter after the reaction to obtain the slime filter cake.

[0044] (3) Grinding in a sand mill after mixing the slime filter cake with water, the grinding conditions are: the slurry concentration is 50%, the rotating speed is 820 rpm, the grinding medium adopts zirconia balls, and the ball-to-material ratio is 5:1, Ball milling for 8 hours; use a disc centrifugal classifier to classify the overflow product with -2μm>90%; use a spray dryer to dry the overflow product. The drying conditions are: the concentration of the feed slurry is controlled at 50%, and the inlet temperature is 400°C, the outlet air temperature is 100°C.

[0045] (4) Fluidized roasting is carried out to the dry p...

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Abstract

A method for preparing double-90 white filler from bauxite tailing comprises the following steps: firstly, heating the bauxite tailing and sulfuric acid at the temperature of 150-300 DEG C for 4-24 hours; secondly, adding water to adjust the pulp density and the pH value; adding sodium dithionite, performing reaction at the temperature of 25-90 DEG C and then filtering to obtain an ore sludge filter cake; adding water into the ore sludge filter cake and mixing to form ore pulp; grinding, grading and drying the ore pulp to obtain superfine powder with the grading content of 0.2 Mum and the whiteness of more than 90 percent; and finally, calcining the superfine powder at the temperature of 800-1000 DEG C to obtain the double-90 white filler. The double-90 white filler produced by the method disclosed by the invention has a high added value, can be applied to the fields of high-grade coating and paint, plastic, rubber and the like and has favorable economic benefits and social benefits. The method disclosed by the invention has the advantages of simple process, low cost, less investment and easiness in realization of industrial production. According to the method disclosed by the invention, the bauxite tailing can be treated in a large batch, the waste can be changed into valuables and a favorable technical path for treating and comprehensively utilizing the bauxite tailing is provided.

Description

technical field [0001] The invention discloses a method for comprehensive utilization of bauxite ore dressing tailings, in particular to a method for preparing "double 90" white filler by using bauxite ore dressing tailings; it belongs to the technical field of comprehensive utilization of bauxite ore dressing tailings. Background technique [0002] my country's bauxite resources are relatively rich, which can basically meet the resource conditions for the development of the alumina industry. However, since the vast majority of bauxite in my country belongs to the diaspore type with high aluminum, high silicon and low iron, more than 80% of the bauxite has an aluminum-silicon ratio (abbreviated as A / S) between 5 and 8, so Alumina cannot be produced by the more economical conventional Bayer method (requiring A / S not less than 10) commonly used abroad. In order to improve the A / S of bauxite, it is necessary to beneficiate middle and low-grade bauxite so that it can be directly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/04C09C3/06
Inventor 肖奇朱高远童秋桃
Owner CENT SOUTH UNIV
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