Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing Ca-alpha-sialon material by using multi-metal mine tailing

A polymetallic, al2o3 technology, applied in the fields of ceramics and refractory materials, can solve the problems of affecting product performance, difficult to control the ratio of β-sialon of multiphase materials, etc., so as to relieve the pressure of the environment, simplify the preparation process and reduce the manufacturing cost. Effect

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH BEIJING
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is that the ratio of the obtained composite material β-sialon to α-sialon is not easy to control, which affects the performance of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing Ca-alpha-sialon material by using multi-metal mine tailing
  • Method for producing Ca-alpha-sialon material by using multi-metal mine tailing
  • Method for producing Ca-alpha-sialon material by using multi-metal mine tailing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Tailings, SiO 2 、Al 2 o 3 , carbon (graphite or carbon black) are mixed according to the mass percentage of 2.000: 1.846: 0.286: 1.324, and absolute ethanol is added in the mixing process and mixed evenly.

[0026] Take out the mixed powder, add the binder, and press it under the pressure of 20MPa to form a small circular sample of Φ20×4mm, and dry it at 80°C for 10 hours after demoulding.

[0027] Put the dried body into a tube furnace, feed a nitrogen flow of 0.6 liters / min, raise the temperature to 800°C at a rate of 6°C / min, and keep it warm for 0.5 hours; then continue to heat up at a rate of 4°C / min to 1200°C, keep warm for 2 hours; continue to heat up to 1500°C, at a heating rate of 2.5°C / min, keep warm for 8 hours.

[0028] Lower the atmosphere sintering furnace to 1200°C at a rate of 4°C / min, and then keep it at 1200°C for 0.5 hours; stop the nitrogen flow when it is naturally cooled to 500°C, and continue to cool to 100°C to take out the sintered product. ...

Embodiment 2

[0030] Tailings, SiO 2 、Al 2 o 3 , carbon (graphite or carbon black) are mixed according to the mass percentage of 2.000: 1.798: 0.288: 1.306, and absolute ethanol is added in the mixing process and mixed evenly.

[0031] Take out the mixed powder, add the binder, and press it under the pressure of 20MPa to form a small circular sample of Φ20×4mm, and dry it at 80°C for 10 hours after demoulding.

[0032] Put the dried body into a tube furnace, feed a nitrogen flow of 0.6 liters / min, raise the temperature to 800°C at a rate of 6°C / min, and keep it warm for 0.5 hours; then continue to heat up at a rate of 4°C / min to 1200°C, keep warm for 2 hours; continue to heat up to 1500°C, at a heating rate of 2.5°C / min, keep warm for 8 hours.

[0033] Reduce the atmosphere sintering furnace to 1200°C at a rate of 4°C / min, and then keep it at 1200°C for 0.5 hours; stop nitrogen gas when it is naturally cooled to 500°C, and continue to cool to 100°C to take out the sintered product to obt...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing sialon material by utilizing polymetallic tailings, and relates to the technical fields of ceramics and refractory materials. In this method, polymetallic tailings are used as raw materials, SiO2 and Al2O3 are added, and carbon is used as a reducing agent. The mixture is fully mixed, and the binder PVA is added. After molding, it is sintered in a nitrogen atmosphere. After cooling, the main crystal phase is Ca- The final product of α-sialon and secondary crystal phase is SiC, and the mass percentage of sialon in the product is 60-80%. The present invention has the advantages of simple process, easy control of conditions, full utilization of waste resources such as tailings, turning waste into treasure, and the obtained sialon material can be widely used in metallurgy, chemical industry, electric power, energy and other industrial fields. Natural resources are rationally and fully utilized.

Description

[0001] Field [0002] The invention relates to the technical fields of ceramics and refractory materials, and in particular provides a method for preparing sialon materials by using polymetallic tailings, and the prepared products have relatively high purity. Background technique [0003] Sialon is a structural ceramic with excellent performance. It has superior mechanical properties, thermal properties and chemical stability. It can be widely used in metallurgy, traffic, transportation, chemical machinery, building materials, medicine, aerospace and other fields. α-sialon has high hardness and can maintain high temperature, and has good wear resistance. [0004] Ca-α-sialon can be prepared at low cost by carbothermal reduction nitriding method, but it is difficult to prepare high-purity and high-performance Ca-α-sialon materials. [0005] Publication number is that in the Chinese invention patent application of CN 1923754A, a kind of high alumina bauxite, CaCO 3 Ca-α-Sialon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/599C04B35/622
Inventor 连芳郭玉娟徐利华袁节平刘澜明
Owner UNIV OF SCI & TECH BEIJING