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Lightweight hanging brick for cement kiln grate cooler and preparation method thereof

A technology of grate cooler and cement kiln, applied in the field of refractory materials, can solve the problems of great difference in thermal expansion coefficient of composite structure, no obvious increase in porosity, influence of thermal conductivity of castables, etc., to achieve excellent corrosion resistance and improve porosity. efficiency and light weight, and the effect of improving the overall mechanical properties

Active Publication Date: 2022-08-02
营口丰华耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN215373514U discloses a cement kiln refractory material lining hanging brick structure, the structure adopts multifunctional hanging brick working layer and heat insulating nano heat insulating layer, this kind of composite structure It has been widely used in cement kilns, but the thermal expansion coefficients of composite structures are very different, and it is easy to cause thermal spalling between layers during service, which endangers the safety of cement production.
However, the preparation cost of ceramic aggregates with nanopores is relatively high, and the porosity has not been significantly improved, so the impact on the overall thermal conductivity of the castable is relatively limited

Method used

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  • Lightweight hanging brick for cement kiln grate cooler and preparation method thereof
  • Lightweight hanging brick for cement kiln grate cooler and preparation method thereof

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preparation example Construction

[0036] A method for preparing lightweight hanging bricks for a cement kiln grate cooler, comprising the following steps:

[0037] Step 1. Carry out batching according to the raw materials of the lightweight hanging bricks and their content, first blend the bauxite aggregate, the electrolytic cell sidewall aggregate and the organic silicon waste liquid, and mix for 5 to 15 minutes, Mixture A is made; then described bauxite fine powder, described Guangxi white mud fine powder, described elemental Si powder and described α-Al 2 O 3 The micropowder is added to the mixture A, and the mixture is continuously mixed for 15 to 20 minutes to obtain the mixture B; then the mixture B is trapped for 12 to 24 hours, and pressed and formed under the condition of 50 to 100 MPa to obtain a green body.

[0038] Step 2. Dry the green body at 100-120°C for 12-24h; in the sintering furnace, the temperature is first raised from room temperature to 1000°C at a rate of 4-6°C / min, and then heated at ...

Embodiment 1

[0040] A lightweight hanging brick for a cement kiln grate cooler and a preparation method thereof:

[0041] ① First, 60 parts of bauxite aggregate, 10 parts of electrolytic cell side wall aggregate and 3 parts of organic silicon waste liquid are blended, and mixed for 5 minutes to make mixture A; then 12 parts of bauxite fine powder, 4 parts of Guangxi white Mud fine powder, 1 part of elemental Si powder and 4 parts of α-Al 2 O 3 The micropowder was added to the mixture A, and the mixture was continued for 15 minutes to obtain the mixture B; then the mixture B was trapped for 12 hours, and pressed and formed under the condition of 50 MPa to obtain the china.

[0042] ② Dry the green body at 100°C for 24 hours; in the sintering furnace, the temperature is first heated from room temperature to 1000°C at a rate of 5°C / min, and then heated to 1350°C at a rate of 2°C / min, and kept for 3 hours. Cool, cut and grind to make lightweight hanging bricks.

[0043] The infrared radiati...

Embodiment 2

[0045] A lightweight hanging brick for a cement kiln grate cooler and a preparation method thereof:

[0046] ① First, 70 parts of bauxite aggregate, 5 parts of electrolytic cell side wall aggregate and 5 parts of organic silicon waste liquid are blended, and mixed for 10 minutes to make mixture A; then 8 parts of bauxite fine powder, 8 parts of Guangxi white Mud fine powder, 3 parts of elemental Si powder and 6 parts of α-Al 2 O 3 The micropowder was added to the mixture A, and the mixture was continued for 20 minutes to obtain the mixture B; then the mixture B was trapped for 24 hours, and pressed and formed under the condition of 100 MPa to obtain the china.

[0047] ② Dry the green body at 120°C for 24 hours; in the sintering furnace, the temperature is first heated from room temperature to 1000°C at a rate of 5°C / min, and then heated to 1450°C at a rate of 2.5°C / min, and kept for 8 hours. Cool, cut and grind to make lightweight hanging bricks.

[0048] The infrared radi...

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Abstract

The invention belongs to the technical field of refractory materials, and relates to a lightweight hanging brick for a cement kiln grate cooler and a preparation method of the lightweight hanging brick. The lightweight hanging brick for the cement kiln grate cooler is prepared from 60-70 parts of alumina aggregate, 8-12 parts of alumina fine powder, 4-12 parts of Guangxi white mud fine powder, 1-3 parts of elemental Si powder, 5-10 parts of electrolytic cell side wall aggregate, 4-8 parts of alpha-Al2O3 micro powder and 3-10 parts of organic silicon waste liquid through mixing, ageing, forming, baking and calcining. The lightweight hanging brick prepared by the invention is excellent in thermal shock resistance and alkali corrosion resistance, small in density, low in heat conductivity coefficient, low in cost, simple and convenient in preparation process, capable of greatly prolonging the service life of a refractory material for a grate cooler and enhancing the structural integrity and stability of the part, and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a lightweight hanging brick for a cement kiln grate cooler and a preparation method thereof. Background technique [0002] Mullite silicon carbide hanging brick is a common kiln lining refractory material in cement kiln grate cooler and other parts. It is fixed in a specific position by a specific hanging device during service. However, this kind of material generally has relatively high cost, high density and high quality in the actual application process, and the metal pendant is easily deformed due to overheating, which seriously threatens the overall service safety of the cement kiln; in addition, mullite silicon carbide The lack of alkali corrosion resistance of refractory materials also seriously affects the longevity of cement kilns. In order to solve the above problems, it is urgent to develop a castable for kiln mouth with excellent thermal shoc...

Claims

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Application Information

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IPC IPC(8): C04B35/103C04B35/622C04B35/632C04B38/02F27D15/02
CPCC04B35/103C04B35/62204C04B35/632C04B38/02F27D15/02C04B2235/428C04B2235/349C04B2235/3463C04B2235/3826C04B2235/3873C04B2235/5427C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2235/9692C04B38/0074Y02P40/60
Inventor 刘春福李正柱胡华张浩黄迪刘延华杨格
Owner 营口丰华耐火材料有限公司
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