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Preparation method of high-temperature smoke filter ceramic material with high thermal shock resistance

A high-temperature flue gas filtration and thermal shock resistance technology, applied in the field of porous inorganic materials, can solve the problem that the thermal shock resistance can only reach 1000°C-20°C, high temperature resistance and thermal shock resistance need to be further improved, filter ceramic pore size , Porosity is difficult to control and other problems, to achieve the effect of easy control of pore size, low raw material price, and easy industrialization promotion

Inactive Publication Date: 2013-04-17
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These technologies are limited to grouting molding, cold isostatic pressing molding or multiple spraying, and dry pressing molding technology cannot be used, it is difficult to achieve mass industrial production, and the maximum operating temperature can only be below 900-1100 ° C, and the thermal shock resistance It can only reach the level of 1000°C-20°C, 10 times without cracking
These patented technologies have complex processes, strict requirements on pore-forming agents, and high production costs. They are not suitable for large-scale industrial production. The pore size and porosity of the prepared filter ceramics are difficult to control, and the high temperature resistance and thermal shock resistance need to be further improved.

Method used

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  • Preparation method of high-temperature smoke filter ceramic material with high thermal shock resistance
  • Preparation method of high-temperature smoke filter ceramic material with high thermal shock resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) In parts by weight, 100 parts of β-cordierite powder, 50 parts of potassium feldspar, 20 parts of spodumene, 10 parts of kaolin, 0.1 part of mullite, 100 parts of ceramic polishing Brick waste, 5 parts of sodium tripolyphosphate and 130 parts of water are put into a ball mill tank, ball milled for 24 hours, and passed through a 80-mesh sieve;

[0038] (2) The obtained slurry is formed by grouting, and injected into a gypsum mold to prepare the required ceramic body;

[0039] (3) The prepared ceramic body was heated up to 200°C at a heating rate of 1°C / min, fired at 1100°C, and kept for 6 hours.

[0040] The prepared filtering ceramics have an apparent porosity of 70.2%, a compressive strength of 12.5MPa, a thermal shock resistance of 12 times from room temperature to 1050°C without cracking, and an air permeability of 215.4m 3 cm / m 2 ·hour·mmH 2 O.

Embodiment 2

[0042] (1) In parts by weight, 100 parts of β-cordierite powder, 0.1 part of potassium feldspar, 50 parts of spodumene, 10 parts of kaolin, 50 parts of mullite, and 90 parts of carbon powder crushed through a 200-mesh sieve Put 0.1 part of sodium tripolyphosphate and 120 parts of water into a ball mill tank, mill for 0.5 hour, and pass through a 80-mesh sieve;

[0043] (2) Spray and granulate the obtained ceramic slurry to obtain ceramic particles, dry press molding under a pressure of 150MPa, and prepare the required ceramic green body;

[0044] (3) The prepared ceramic body was heated up to 200°C at a heating rate of 1.5°C / min, fired at 1250°C, and kept for 4 hours.

[0045] The prepared high-temperature flue gas filter ceramics with high thermal shock resistance have an apparent porosity of 65.3%, a compressive strength of 16.8MPa, a thermal shock resistance of 12 times from room temperature to 1200°C without cracking, and an air permeability of 175.4m 3 cm / m 2 ·hour·mmH ...

Embodiment 3

[0047] (1) In parts by weight, 80 parts of β-cordierite powder, 20 parts of potassium feldspar, 0.1 part of spodumene, 50 parts of kaolin, 25 parts of mullite, and 1 part of silicon carbide crushed through a 200-mesh sieve Put the powder, 0.1 part of sodium tripolyphosphate and 60 parts of water into the ball mill tank, mill for 18 hours, and pass through a 80-mesh sieve;

[0048] (2) Spray and granulate the obtained ceramic slurry to obtain ceramic granules, and cold isostatic press molding under a pressure of 300MPa to prepare the required ceramic green body;

[0049] (3) The prepared ceramic body was heated up to 200°C at a heating rate of 1°C / min, fired at 1500°C, and kept for 5 minutes.

[0050]The prepared high-temperature flue gas filter ceramics have an apparent porosity of 49.1%, a compressive strength of 27.6MPa, a thermal shock resistance of 13 times from room temperature to 1300°C without cracking, and an air permeability of 135.5m 3 cm / m 2 ·hour·mmH 2 O.

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Abstract

The invention discloses a preparation method of a high-temperature smoke filter ceramic material with high thermal shock resistance, wherein the method takes beta-cordierite, potash feldspar, spodumene and kaolin as raw materials, takes mullite as additive and takes carbon powder, starch, silicon carbide powder, limestone, sawdust, coal slag and ceramic waste as hole-forming agent; the high-temperature smoke filter ceramic material with high porosity, high thermal shock resistance, high compression strength, excellent filter performance and controllable aperture can be prepared by ball grinding, molding and sintering processes. The source of the pore-forming agent is wide; the die pressing, cold isostatic pressing and casting molding can be adopted, so that the operation is convenient andthe production cost is low; the filter ceramic material has controllable aperture and porosity, and excellent high temperature resistance and thermal shock resistance. The technology provided by the invention solves dust filter problem of high-temperature and wet gas well and also is applied in kinds of fields such as separation and purification, sound absorption, catalyst carrier and the like.

Description

technical field [0001] The invention relates to the field of porous inorganic materials, in particular to a preparation method of ceramics for filtering high-temperature flue gas with high thermal shock resistance. Background technique [0002] With the rapid development of my country's industry, the problem of environmental pollution has become more and more prominent. A large amount of industrial smoke and dust discharged seriously affects people's health and hinders the sustainable development of my country's industry. According to incomplete statistics, there are hundreds of thermal power plants in my country, hundreds of thousands of industrial boilers and kilns, and the total amount of smoke and dust emitted every year is as high as 100 million tons. These smoke and dust are discharged in the form of high-temperature gas, and the smoke and dust contain a large number of fine impurity particles and harmful chemicals. The direct discharge of these high-temperature dusty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 税安泽田维王燕民奚修安许林峰
Owner SOUTH CHINA UNIV OF TECH
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