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Mullite nano-whisker prepared by using pyrite tailing as raw material and preparation method of mullite nano-whisker

A technology of pyrite tailings and nano-whiskers, applied in chemical instruments and methods, single crystal growth, crystal growth and other directions, can solve the problems of low added value, high energy consumption and high cost, and achieve high added value and calcination temperature. Low cost and low cost of raw materials

Inactive Publication Date: 2015-01-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been a large number of reports on the reuse of pyrite tailings, the existing utilization methods generally produce products with low added value, high energy consumption and high cost.

Method used

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  • Mullite nano-whisker prepared by using pyrite tailing as raw material and preparation method of mullite nano-whisker
  • Mullite nano-whisker prepared by using pyrite tailing as raw material and preparation method of mullite nano-whisker
  • Mullite nano-whisker prepared by using pyrite tailing as raw material and preparation method of mullite nano-whisker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The pyrite tailings used are taken from the flotation tank of a small-scale heavy flotation joint election of an enterprise in southern Sichuan, and its chemical composition weight percentage is: SiO 2 38.41%, A1 2 o 3 32.40%, CaO 3.02%, TiO 2 4.01%, MgO 0.76%, Fe 2 o 3 5.91%, Na 2 O 0.16%, K 2 O 0.35%, SO 30.92%, loss on ignition 14.30%, and the balance is other trace components. The process steps of using the pyrite tailings to prepare mullite whiskers are as follows:

[0039] (1) Ball mill the pyrite tailings at a speed of 400 rpm to a 50-mesh sieve, dehydrate, dry, and grind until passing through a 200-mesh sieve;

[0040] (2) Weigh 50g of pyrite tailings and 170ml of mixed solution with a volume ratio of 1:1 of 25% hydrochloric acid and 25% sulfuric acid, stir in a constant temperature water bath at 60°C for 1 hour, and dehydrate and dry by centrifugation , grinding;

[0041] (3) Calcining the acid-washed pyrite tailings at 400°C for 2 hours to obtain...

Embodiment 2

[0049] The pyrite tailings used are taken from the flotation tank of a small-scale heavy flotation joint election of an enterprise in southern Sichuan, and its chemical composition weight percentage is: SiO 2 38.41%, A1 2 o 3 32.40%, CaO 3.02%, TiO 2 4.01%, MgO 0.76%, Fe 2 o 3 5.91%, Na 2 O 0.16%, K 2 O 0.35%, SO 3 0.92%, loss on ignition 14.30%, and the balance is other trace components. The process steps of using the pyrite tailings to prepare mullite whiskers are as follows:

[0050] (1) Ball mill the pyrite tailings at a speed of 400 rpm to a 50-mesh sieve, dehydrate, dry, and grind until passing through a 200-mesh sieve;

[0051] (2) Weigh 50g of pyrite tailings and 170ml of a mixed solution of 30% hydrochloric acid and 30% sulfuric acid with a volume ratio of 1:1, stir in a constant temperature water bath at 60°C for 1 hour, and centrifuge, dry, and grind ;

[0052] (3) Calcining the acid-washed pyrite tailings at 400°C for 2 hours to obtain composition-ad...

Embodiment 3

[0060] The pyrite tailings used are taken from the flotation tank of a small-scale heavy flotation joint election of an enterprise in southern Sichuan, and its chemical composition weight percentage is: SiO 2 36.99%, A1 2 o 3 30.67%, CaO 3.33%, TiO 2 3.86%, MgO 0.75%, Fe 2 o 3 6.91%, Na 2 O 0.16%, K 2 O 0.36%, SO 3 2.89%, loss on ignition 13.56%, and the balance is other trace components. The process steps of using the pyrite tailings to prepare mullite whiskers are as follows:

[0061] (1) Ball mill the pyrite tailings at a speed of 400 rpm to a 50-mesh sieve, dehydrate, dry, and grind until passing through a 200-mesh sieve;

[0062] (2) Weigh 50g of pyrite tailings and 170ml of a mixed solution of 25% hydrochloric acid and 25% sulfuric acid with a volume ratio of 1:1, stir in a constant temperature water bath at 65°C for 1.5 hours, and centrifuge, dry, and grind ;

[0063] (3) Calcining the acid-washed pyrite tailings at 400°C for 2 hours to obtain composition...

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Abstract

The invention discloses a method for preparing a mullite nano-whisker by using pyrite tailing as a raw material, and belongs to the field of nano-whisker preparation and mineral resource recycling. The method comprises the following steps: preparing the raw material, pickling for removing iron, calcinating for removing C, S and organic matters, preparing a precursor, and performing calcination and acid soaking for removing a glass phase. According to the invention, the prepared nanoscale mullite whisker has good quality, has excellent properties of both the mullite whisker and the nano-whisker, and has a high additional value and a remarkable economic benefit; in addition, the adopted raw material pyrite tailing is waste mineral materials after mineral dressing, so that the products are low in cost of raw materials, and the secondary recycling of pyrite resources is achieved; meanwhile, compared with other preparation methods, the preparation process of the invention requires lower calcination temperature and shorter calcination time, so that reduction of energy consumption is facilitated, thereby reducing production cost and resource consumption, and increasing economic benefits.

Description

technical field [0001] The invention relates to the fields of preparation of nano-whiskers and recycling of mineral resources, in particular to a mullite nano-whisker prepared from pyrite tailings as a raw material and a method thereof. Background technique [0002] Whisker is a single crystal fiber with excellent corrosion resistance, high strength, high hardness, good mechanical strength, high elastic modulus and other characteristics. Whiskers are usually added to plastics, metals, ceramics and other materials as modified reinforcing materials, which greatly enhance the physical and chemical properties and excellent mechanical properties of raw materials. As a kind of whisker, mullite whisker has the properties of anti-oxidation, high temperature resistance, wear resistance, small thermal expansion coefficient, high temperature strength, good thermal shock resistance and low high temperature creep. Therefore, mullite whiskers have extremely high utilization value as high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/10C30B1/00
CPCC30B1/00C30B29/10C30B29/62
Inventor 叶巧明黄欢王明珠董悦罗如意马敏吴娇
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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