Low-temperature preparation method for lightweight heat-insulation ceramics

A lightweight thermal insulation and ceramic technology, applied in ceramic products, ceramic material production, clay products and other directions, can solve the problems of complex preparation process of modified clay, cumbersome firing process, high energy consumption, etc., to improve the effect of building energy saving , The effect of reducing raw material consumption and reducing production energy consumption

Inactive Publication Date: 2018-06-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In recent years, light-weight heat-insulating ceramics have developed rapidly, but their preparation technology generally has shortcomings such as high raw material requirements, complicated processes, high equipment requirements, and high firing temperatures.
[0003] For example, the patent "a light-weight heat-insulating ceramic product and its manufacturing method" (CN105174905A), although the product has a unique negative ion release function and is used in the fields of health and environmental protection, the raw material requirements are high (especially containing rare earth oxides). Moreover, it needs to be pre-fired at 850-1000°C for 2.5-3.5h, and then heated to 1500-1650°C for 7-8h before it can be made. The firing temperature is high and it is difficult for ordinary ceramic kilns to achieve
The patent "a porous thermal insulation ceramic material for building and its preparation method" (CN106478077A) adopts the method of combining foaming technology and injection molding to prepare porous thermal insulation ceramics with uniform structure, good thermal insulation performance and thermal shock resistance, but Need to use reinforcing fiber, yttrium oxide or zirconia, etc., and the cost of raw materials is high
In addition, in a high-purity nitrogen atmosphere, quickly heat up to 1000-1200°C for 1-3 hours, then slowly heat up to 1300-1500°C, sinter for 1-2 hours, and then cool down to 600-1000°C for 1-5 hours after sintering. Produced

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] A preparation method of lightweight heat-insulating ceramics, the preparation flow chart is as follows figure 1 shown, including the following steps:

[0033] (1) Pass the construction waste through a 30-mesh sieve after ball milling, then weigh 67g of construction waste, 23g of albite, 9.3g of ball soil, and 0.7g of SiC, and use a ball mill to mix the materials for 1 hour at a speed of 600r / min;

[0034] (2) Grind the mixture after ball milling with water, pass through a 30-mesh sieve, and put it into an oven to dry at 60°C for 5 minutes;

[0035] (3) Pour the granulated powder in step (2) into a mold, press to form at 200MPa, and then dry;

[0036] (4) Put the ceramic body obtained in step (3) into a high-temperature furnace for firing at a firing temperature of 1200°C, a heating rate of 50°C / min, and a holding time of 0.1 hour to obtain lightweight heat-insulating ceramics.

[0037] The cross-sectional morphology of the lightweight heat-insulating ceramics obtained...

Embodiment 2

[0040] A preparation method of lightweight heat-insulating ceramics, comprising the following steps:

[0041] (1) Take by weighing 10g ball soil, 90g ceramic polishing slag, with ball mill with the rotating speed of 400r / min, ball mill mixing 2 hours;

[0042] (2) Grind the ball-milled mixture with water, pass through a 300-mesh sieve, and bake in an oven at 80°C for 6 minutes;

[0043] (3) Pour the granulated powder in step (2) into a mold, press to form under 10MPa, and then dry;

[0044] (4) Put the ceramic body obtained in step (3) into a high-temperature furnace for firing at a firing temperature of 1150°C, a heating rate of 2°C / min, and a holding time of 1.5 hours to obtain lightweight heat-insulating ceramics.

[0045] The lightweight heat-insulating ceramics prepared in this example have a density of 0.37g / cm 3 , the water absorption rate is 3.29%, the compressive strength is 2.58MPa, the average pore diameter is 1.36mm, and the thermal conductivity is 0.10W / m·K.

Embodiment 3

[0047] A preparation method of lightweight heat-insulating ceramics, comprising the following steps:

[0048] (1) Put the construction waste through a 200-mesh sieve after ball milling, then weigh 30g of construction waste, 30g of ceramic polishing slag, 30g of fly ash, and 10g of ball soil, and use a ball mill to mix the materials for 24 hours at a speed of 200r / min ;

[0049] (2) Grind the ball-milled mixture with water, pass through a 200-mesh sieve, and bake in an oven at 100°C for 5 minutes;

[0050] (3) Pour the granulated powder in step (2) into a mold, press to form at 1000MPa, and then dry;

[0051](4) Put the ceramic body obtained in step (3) into a high-temperature furnace for firing at a firing temperature of 1100°C, a heating rate of 30°C / min, and a holding time of 12 hours to obtain lightweight heat-insulating ceramics.

[0052] The lightweight heat-insulating ceramics prepared in this example have a density of 0.76g / cm 3 , the water absorption rate is 1.03%, ...

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Abstract

The invention discloses a low-temperature preparation method for lightweight heat-insulation ceramics. Raw materials used in the preparation method comprise construction waste, ceramic polishing slag,fly ash, talc, feldspar, ball clay, diatomite and a foaming agent, wherein the amount of the solid waste is 60% or more. Pre-treated construction waste and other raw materials are subjected to ball milling mixing, and then subject to granulation, compaction molding, drying and low temperature sintering (700-1200 DEG C) to prepare the environmentally friendly lightweight heat-insulation ceramics.The method is simple in process, low in production cost and suitable for industrialized production. The prepared lightweight heat-insulation ceramics have the advantages of low density, controllable pore size, low heat conductivity, excellent mechanical properties and the like, and can be widely applied in heat preservation and heat insulation in the fields of architecture, chemical industry and the like. While achieving low temperature sintering, energy saving and emission reduction, the method can promote high-efficiency resource utilization of the solid waste, and is of great significance to the ecological environment.

Description

technical field [0001] The invention relates to a preparation method of light-weight heat-insulating ceramics, in particular to a low-temperature firing method of light-weight heat-insulating ceramics. Background technique [0002] Lightweight thermal insulation ceramics have small specific gravity and low thermal conductivity, and have been widely used in construction, energy, chemical industry, aerospace and other fields. In recent years, light-weight heat-insulating ceramics have been developed rapidly, but their preparation technology generally has disadvantages such as high raw material requirements, complex processes, high equipment requirements, and high firing temperatures. [0003] For example, the patent "a light-weight heat-insulating ceramic product and its manufacturing method" (CN105174905A), although the product has a unique negative ion release function and is used in the fields of health and environmental protection, the raw material requirements are high (e...

Claims

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Application Information

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IPC IPC(8): C04B33/132C04B33/135C04B38/02
CPCC04B33/1324C04B33/1352C04B38/02C04B2235/349C04B2235/3472C04B2235/3418C04B2235/9607C04B2235/96C04B2235/77C04B38/0067C04B38/0054Y02P40/60
Inventor 税安泽高小云李秋玲胡家兴马娟
Owner SOUTH CHINA UNIV OF TECH
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