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Comprehensive utilization method of graphite tailings

A technology of graphite tailings and quartz powder, which is applied in the removal of solid waste, etc., can solve the problems of strict process requirements, small firing temperature range of billets, and great influence of firing system, and achieves high strength, good compactness, Small shrinkage effect

Inactive Publication Date: 2012-04-04
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when firing sintered bricks, the sintering temperature range of the billet containing graphite tailings is relatively small, which has a great influence on the sintering system, and the process requirements are strict.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Mix 400g of graphite tailings, 280g of quartz powder, and 120g of kaolin evenly, and grind them in a ball mill for 30 minutes, so that the fineness of the mixture reaches 200 mesh and the residue is less than 1%;

[0025] 2. Mix 300g of the mixed powder prepared in step 1 with 60g of water and stir evenly, then place it in a closed space for aging for 24 hours, and then press and shape it in a pressure molding machine with a molding pressure of 10MPa;

[0026] 3. Put the molded ceramic blank in a dryer, and dry it at 105°C for 24 hours, so that the moisture content is less than 1.0%;

[0027] 4. Calcining the dried blank. The firing process is as follows: the heating rate in the range from normal temperature to 500°C is 3°C / min, the heating rate in the range from 500°C to 1100°C is 1°C / min, the firing temperature is 1030°C, the temperature is kept constant for 2 hours, and the temperature is lowered from the firing temperature to 300°C. The cooling rate is 7°C / min, ...

Embodiment 2

[0032] 1. Mix 375g of graphite tailings, 25g of quartz powder, and 100g of kaolin evenly, and then grind in a ball mill for 120 minutes, so that the fineness of the mixture reaches 600 mesh and the residue is less than 5%;

[0033] 2. Mix 300g of the mixed powder prepared in step 1 with 100g of water and stir evenly, then place it in a closed space for aging for 72h, and then press and shape it in a pressure molding machine with a molding pressure of 25MPa;

[0034] 3. Put the molded ceramic blank in a dryer, and dry it at 105°C for 24 hours, so that the moisture content is less than 1.0%;

[0035] 4. Calcining the dried blank. The firing process is as follows: the heating rate in the range from room temperature to 500°C is 10°C / min, the heating rate in the range from 500°C to 1100°C is 2.5°C / min, the firing temperature is 1100°C, the temperature is kept constant for 5 hours, and the temperature is lowered from the firing temperature to 300°C. The cooling rate is 5°C / min, and...

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Abstract

The invention discloses a comprehensive utilization method of graphite tailings. According to the invention, graphite tailings, quartz powder, and kaolin are adopted as raw materials, and are mixed according to a certain mass ratio. The mixture is grinded, water is added to the mixture, and the mixture is mixed; the mixture is aged, and is processed through pressure-molding; the molded material is processed through high-temperature calcining, such that feldspar-quality daily-use ceramics are produced. The required mass ratio of graphite tailings to quartz powder to kaolin is 50-75:5-35:15-45.The daily-use ceramics are characterized by high strength, good compactness, low water absorption, and small shrinkage. The ceramics are not easy to deform.

Description

Technical field [0001] The invention relates to a method for comprehensive utilization of graphite tailings, belonging to the fields of environmental engineering and solid waste recycling. Background technique [0002] Graphite, as an important non-metallic mineral material with high electrical conductivity, high thermal conductivity, acid and alkali corrosion resistance and lubrication, is widely used in many industrial fields. In recent years, with the rapid development of my country's industrial technology, the demand for graphite is increasing day by day. However, a large amount of tailings discharged during graphite mining has accumulated, causing environmental hazards such as occupying land, polluting water and soil, and posing a huge safety hazard of dam failure. According to statistics, an average of about 20 tons of graphite tailings need to be discharged to produce 1 ton of graphite products. At present, there are more than 100 large and small graphite tailing po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/16C04B35/14C04B35/622B09B3/00
Inventor 廖立兵杜高翔陈宝海杨敏王志伟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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