Method for preparing mullite multiple phase nanocrystalline using natural kaolin

A technology of kaolin and mullite, which is applied in the field of preparing mullite composite nanocrystalline materials, can solve problems such as unfavorable production, achieve the effects of improving performance indicators, reducing production costs, and expanding application fields

Inactive Publication Date: 2006-02-15
GUILIN UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0003] At present, there are few methods for preparing mullite composite nanocrystals from kaolin, and they are all completed in high-pressure reactors, which is not conducive to actual production.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0016] Using natural kaolin as raw material, wash and classify it with water, use H 2 o 2 Oxidize the filtered sample for 1 hour, soak and reduce kaolin with oxalic acid for 3 hours, wash and filter the acid-leached sample with clean water until pH = 6.5. Stir the oxidized sample with hydrosulfite for 1 hour; soak the kaolin with hydrochloric acid, wash and filter the acid-leached kaolin to pH = 6.5; after drying, calcinate at 780°C for 2 hours to obtain refined kaolin powder, synthesized at 1150°C For mullite concentrate powder, the heating rate is 8°C / min.

[0017] The chemical composition and process conditions for synthesizing mullite multi-phase nanocrystals: use mullite concentrate powder synthesized by combustion as the main raw material after refinement, use 5-10 grams of concentrate powder, and use the mass ratio mNa 2 O / mSiO 2 =2.8-3.0; mH 2 O / mNa 2 O=30-35 (NaOH concentration 4.0 mol / liter) Calculate the quality of required NaOH, deionized water. The sample wa...

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Abstract

The invention discloses a preparation method for mullite composite-phase nano crystal by natural China clay at normal temperature and pressure. Wherein, preparing fine mineral powder, calculating mass of NaOH and deionized water when selecting said powder 5-10g, according to the proportion: mNa2O/mSiO2=2.8-3.0, mH2O/mNa2O=30-35(NaOH concentration 4.0mol/l); putting the sample into beaker to mix; sealing the beaker and putting into magnetic-heating mixer till 80-100Deg; stopping mixing, holding temperature for 2-5h; stratifying and filtering solution; putting the filtered crystal into thermostatic drying cabinet at 110Deg and obtaining the objective product. This method is simple and practical, decreases cost, and increases product performance.

Description

technical field [0001] The invention relates to a method for preparing a mullite composite nanocrystal material, in particular to a method for preparing a mullite composite nanocrystal at normal temperature and pressure using natural kaolin. Background technique [0002] Kaolin is a non-metallic mineral resource with a very wide distribution and a very large mineral reserve. Reasonable mining and utilization of its mineral resources, the use of its preparation has a low thermal conductivity and thermal expansion coefficient, high refractoriness, good thermal shock resistance, and creep resistance. Mullite material with excellent denaturation properties, high load softening temperature, good volume stability, and strong electrical insulation; good chemical stability, mullite shows strong performance in carbonated solvents, alkaline solvents, and glass melts It is an ideal advanced refractory material, so it is widely used in industries such as metallurgy, glass, ceramics, che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26C04B33/04
Inventor 陈南春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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