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Method for preparing cristobalite by calcining quartz

A cristobalite and quartz technology, applied in the field of calcined quartz to prepare cristobalite, can solve the problems of large amount of additives added, low conversion rate, influence on the purity of cristobalite, etc., and achieve the effects of high conversion rate, reduced energy consumption, and reduced production cost.

Inactive Publication Date: 2007-09-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main defect of the above method is that the addition of additives is too large, which affects the purity of cristobalite, and the conversion rate is low

Method used

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  • Method for preparing cristobalite by calcining quartz
  • Method for preparing cristobalite by calcining quartz
  • Method for preparing cristobalite by calcining quartz

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 5.00g of quartz powder less than 0.149mm into the corundum crucible, add yttrium oxide with a weight of 2‰ of the quartz powder, add sodium carbonate with a weight of 8‰ of the quartz powder, add barium fluoride with a weight of 5‰ of the quartz powder, mix well , placed in a silicon molybdenum rod box-type resistance furnace, heated to 1300 °C at a rate of 4 °C per minute, and kept at 1300 °C for 6 hours to obtain a cristobalite product, and the product was subjected to X powder crystal diffraction analysis to obtain XRD pattern 3 . It can be seen from Figure 3 that the cristobalite conversion rate is 95.23%.

Embodiment 2

[0028] Put 5.00g of quartz powder less than 0.149mm into the corundum crucible, add yttrium oxide with a weight of 5‰ of the quartz powder, add sodium carbonate with a weight of 9‰ of the quartz powder, add barium fluoride with a weight of 3‰ of the quartz powder, mix well , placed in a silicon molybdenum rod box-type resistance furnace, heated to 1300 °C at a rate of 4 °C per minute, and kept at 1300 °C for 6 hours to obtain a cristobalite product, and the product was subjected to X powder crystal diffraction analysis to obtain XRD pattern 4 . It can be seen from Figure 4 that the cristobalite conversion rate is 94.34%.

Embodiment 3

[0030] Put 5.00g of quartz powder less than 0.149mm into the corundum crucible, add yttrium oxide with a weight of 4‰ of the quartz powder, add sodium carbonate with a weight of 8‰ of the quartz powder, add barium fluoride with a weight of 5‰ of the quartz powder, mix well , placed in a silicon molybdenum rod box-type resistance furnace, heated to 1300 °C at a rate of 4 °C per minute, and kept at 1300 °C for 6 hours to obtain a cristobalite product, and the product was subjected to X powder crystal diffraction analysis to obtain XRD pattern 5 . It can be seen from Figure 5 that the cristobalite conversion is 95.23%.

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PUM

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Abstract

The invention disclose a preparing method of cristobalite through calcining quartz, which comprises the following steps: 1) mixing quartz power and phase-change activator; getting batches; compositing Y2O3,Na2CO and BaF2 as phase-change activator; making the adding quantity of Y2O3, Na2CO3 and BaF2 separately at 1 per mill -5 per mill , 5 per mill -10 per mill and 1 per mill -5 per mill against the weight of quartz power; 2) heating the batches up to 1300 deg.c with speed of 2-10 deg.c per minuet; keeping temperature at 1300 deg.c at 6 h; getting product with quartz phase bigger-than 94%.

Description

technical field [0001] The invention relates to a method for preparing cristobalite by calcining quartz. Background technique [0002] Cristobalite is a mineral species of quartz group minerals, which is divided into high-temperature cristobalite (α-cristobalite) and low-temperature cristobalite (β-cristobalite). The phase transition temperature between them is 200-270°C, accompanied by a large volume change. Natural cristobalite is generally produced in bubbles formed by volcanic rocks, without natural minerals. The quartz group minerals have a phase transition process at different temperatures and pressures. When the temperature reaches 1470 ° C, the quartz will be transformed into α-cristobalite. This property is usually used for the industrial production of cristobalite. Due to its unique properties, cristobalite powder has been widely used in precision casting, high-grade electric porcelain, dental materials, electronic wafers, polishing m...

Claims

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Application Information

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IPC IPC(8): C03B20/00
Inventor 严春杰李予晋
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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