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Method for preparing mullite whisker by use of gangue

A technology of mullite whiskers and coal gangue, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as high raw material costs and non-compliance with energy management policies

Inactive Publication Date: 2012-01-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of system formula is that all chemical raw materials are used to synthesize mullite whiskers, which has high raw material costs and does not conform to the current national energy management policy.

Method used

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  • Method for preparing mullite whisker by use of gangue
  • Method for preparing mullite whisker by use of gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) First put coal gangue into a corundum ball mill tank, use corundum balls as the grinding body, and water as the grinding medium, wherein the mass ratio of coal gangue: corundum balls: water = 1:2:1, and then put the corundum ball mill into the tank Install it on a planetary ball mill for fine grinding for 30 minutes, then dry the ball-milled slurry, grind it finely and pass through a 40-mesh sieve;

[0021] 2) Al with a purity of 99.0% 2 (SO 4 ) 3 18H 2 O was ground in a mortar, and passed through a 20-mesh sieve;

[0022] 3) The sieved coal gangue and Al 2 (SO 4 ) 3 18H 2 O, Na with a purity of 99.0% 2 SO 4 Mix well to make a mixture, then put the mixture into a corundum beaker and seal it with a cover, move it to a high-temperature electric furnace at a rate of 10°C / min from room temperature to 1100°C for 3 hours, and then cool it naturally with the furnace to room temperature;

[0023] Al in the mixture 2 o 3 with SiO 2 The molar ratio is 1.5:1, Na ...

Embodiment 2

[0028] Embodiment 2: Step 3 of this embodiment) the calcination temperature is 1000°C, the holding time is 4 hours, and the Al in the mixture 2 o 3 with SiO 2 The molar ratio is 1.2:1, Na 2 SO 4 The addition of is 70% of compound quality; Other steps are with embodiment 1.

Embodiment 3

[0029] Embodiment 3: Step 3 of this embodiment) the calcination temperature is 1200°C, the holding time is 2 hours, and the Al in the mixture 2 o 3 with SiO 2 The molar ratio is 1.4:1, Na 2 SO 4The addition of is 60% of compound quality; Other steps are with embodiment 1.

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Abstract

A method for preparing mullite whisker by the use of gangue comprises the following steps of: firstly filling gangue into a corundum ball milling tank, placing the corundum ball milling tank onto a planetary bowl mill for ball milling, drying a slurry, grinding and sieving through a sieve of 40 meshes; grinding Al2(SO4)3.18H2O in a mortar, sieving through a sieve of 20 meshes, fully mixing gangue, Al2(SO4)3.18H2O and Na2SO4, filling into a corundum beaker, capping and sealing, placing to a high temperature electric furnace, calcining to 1000-1200DEG C, keeping warm for 2-4 hours, naturally cooling with the furnace, washing the calcined material by distilled water, filtering, drying, then washing by the use of 20% of HF acid, filtering, and drying. According to the invention, a solid waste gangue discharged during the coal mining process and the coal washing process is used as a main raw material, Al2(SO4)3.18H2O is used to adjust the content of aluminium in the formula, and Na2SO4 is used as a fluxing agent, so as to synthesize the mullite whisker at low temperature. The length of the synthesized whisker is 2.0-6.5 microns and its diameter is 50-120nm.

Description

technical field [0001] The invention belongs to the field of material science, in particular to a method for preparing mullite whiskers from coal gangue. Background technique [0002] Whiskers are generally defined as a single crystal fiber material with a certain aspect ratio grown under artificially controlled conditions, whose diameter is so small that it is difficult to accommodate the defects that often occur in large crystals, and whose atoms are highly ordered , the strength is close to the theoretical value of a complete crystal, so it has excellent corrosion resistance, good mechanical strength, electrical insulation, light weight, high strength, high elastic modulus, high hardness and other characteristics, as plastics, metals, ceramics It shows excellent physical and chemical properties and excellent mechanical properties when it is modified and reinforced materials. [0003] Mullite whiskers have excellent properties such as high temperature resistance, wear res...

Claims

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Application Information

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IPC IPC(8): C30B1/10C30B29/34C30B29/62
Inventor 武秀兰赵丹任强王婧张生浩
Owner SHAANXI UNIV OF SCI & TECH