Silica fire resistant castable and preparing method thereof

A refractory castable, silicon technology, applied in the field of refractory castables, can solve the problems of poor thermal shock resistance, extensive restrictions, low refractoriness, etc., to improve density and strength, expand the scope of use, and good density Effect

Inactive Publication Date: 2009-10-07
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of siliceous refractories is that the polycrystalline transformation of silicon oxide leads to large volume changes, making it poor in thermal shock resistance below 600 °C; secondly, the refractoriness is not high, which limits the breadth of applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 A kind of siliceous refractory castable and its preparation method

[0014] First, 65-67wt% of quartz particles, 25-28wt% of quartz fine powder, 5-8wt% of silicon micropowder, 1-2wt% of high alumina cement, 0.1-0.2wt% of sodium tripolyphosphate, 0.05-0.1 Mix wt% sodium hexametaphosphate and 0.08-0.15wt% organic fiber, add 5-8wt% water of the above-mentioned mixture, stir evenly, vibrate and shape, dry; then burn at 590-650°C, A silicon refractory castable is prepared.

[0015] In this embodiment 1: the gradation of quartz particles is: particle diameter is 35~45wt% for 3~1mm, and particle diameter is 55~65wt% for 1~0mm; The particle diameter of quartz fine powder is less than 0.088mm; Micronized SiO 2 Content ≥ 92%, particle size less than 10μm.

[0016] The castable prepared in Example 1 is tested: after 110°C×24h, the bulk density is 2.12-2.26g / cm 3 , the flexural strength is 2.80~2.95MPa, the compressive strength is 24~26MPa; the linear change rate a...

Embodiment 2

[0017] Example 2 A silicon refractory castable and its preparation method

[0018] First, 67-70wt% of quartz particles, 23-26wt% of quartz fine powder, 4-6wt% of silicon micropowder, 1-2wt% of high alumina cement and calcium aluminate cement, 0.1-0.2wt% of tripolyphosphoric acid Sodium, 0.05-0.1wt% sodium hexametaphosphate and 0.08-0.15wt% organic fiber are mixed, and 7-10wt% water is added to the above-mentioned mixture, stirred evenly, vibrated and molded, dried; then heated at 650-700°C Fired under the same conditions to obtain silicon refractory castables. All the other are with embodiment 1.

[0019] The castable prepared in Example 2 is tested: after 110°C×24h, the bulk density is 2.1-2.3g / cm 3 , the flexural strength is 2.9~3.2MPa, the compressive strength is 25~28MPa; the line change rate after burning at 650℃×3h is +0.26~+0.34%, and the compressive strength is 29~33MPa.

Embodiment 3

[0020] Embodiment 3 A kind of siliceous refractory castable and its preparation method

[0021] First, 70-72wt% of quartz particles, 22-24wt% of quartz fine powder, 4-6wt% of silicon micropowder, 1-2wt% of high alumina cement and Portland cement, 0.1-0.2wt% of tripolyphosphoric acid Sodium, 0.05-0.1wt% sodium hexametaphosphate and 0.08-0.15wt% organic fiber are mixed, and 7-10wt% water is added to the above-mentioned mixture, stirred evenly, vibrated and molded, dried; then heated at 700-750°C Fired under the same conditions to obtain silicon refractory castables. All the other are with embodiment 1.

[0022] The castable prepared in Example 3 is tested: after 110°C×24h, the bulk density is 2.20-2.32g / cm 3 , the flexural strength is 2.9~3.5MPa, the compressive strength is 26~30MPa; the line change rate after burning at 730℃×3h is +0.33~+0.39%, and the compressive strength is 31~35MPa.

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Abstract

The present invention relates to a silica fire resistant castable and a preparing method thereof. A technical scheme includes steps as follows: mixing quartz grain by weight of 65-75 wt%, rock quartz fine powder by weight of 20-28 wt%, silicon micronized quartz powder by weight of 2-8 wt%, cement by weight of 1-3 wt%, sodium tripolyphosphate by weight of 0.1-0.2 wt% and sodium hexametaphosphate by weight of 0.05-0.1 wt%, than adding water by weight of 5-10 wt% to the mixing material as above, stirring evenly, vibration moulding, drying; then sintering under condition of 590-800 DEG C for preparing the silica fire resistant castable. The method uses the silicon micronized quartz powder as additive agent for adding into the silica fire resistant castable which can increase compactness degree and strength of the products, reduce hard fire working procedure. The silicon micronized quartz powder is used in fire resistant material which can make waste recycling and harmless, and has economic benefit and environmental benefit. The prepared silica fire resistant castable has advantages of better compactness degree, high strength, low cost and environmental-friendly energy-saving.

Description

technical field [0001] The invention belongs to the technical field of refractory castables. Specifically relates to a silicon refractory castable and a preparation method thereof. Background technique [0002] Silicon refractory is a typical acidic refractory, which has good resistance to acid slag erosion, and is resistant to CaO, FeO, Fe 2 o 3 Such oxides also have good resistance, but are easily eroded by Al-containing slag when strongly eroded by alkaline slag 2 o 3 、K 2 O, Na 2 Destroyed by oxides such as O. [0003] Typical siliceous refractory materials have high load deformation temperature and high thermal conductivity; when used above 600 °C, they have high thermal shock stability; residual expansion ensures good air tightness and structural strength of masonry. Therefore, it is used as a masonry material for blast furnaces, hot blast stoves and coke ovens. The main disadvantage of siliceous refractories is that the polycrystalline transformation of silico...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 顾华志陈树丰彭天星朱晶晶
Owner WUHAN UNIV OF SCI & TECH
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