CN101391898A

CN101391898A - Low aluminum-containing mullite refractory castable

Info

Publication number: CN101391898A
Application number: CNA2008101219716A
Authority: CN
Inventors: 朱其良; 唐春强; 朱国平; 朱锦和
Original assignee: ZHEJIANG JINCHENG REFRACTORIES CO Ltd
Current assignee: ZHEJIANG JINCHENG REFRACTORIES CO Ltd
Priority date: 2008-10-24
Filing date: 2008-10-24
Publication date: 2009-03-25

Abstract

The invention discloses a low aluminum porzite refractory castable, comprising 70 to 75 percent of porzite M45 and flint clay, 10 to 18 percent of porzite powder, 6 to 7 percent of pure calcium aluminate cement, 2 to 4 percent of Alpha-AI2O3 micropowder and 3 to 5 percent of siliceous dust according to mass percentage. The refractory castable has strong resistance to chemical attack, can not cause the cracking and spalling of the lining, and has long service life.

Description

A kind of low aluminum-containing mullite refractory castable

Technical field

The present invention relates to refractory castable, particularly a kind of low aluminum-containing mullite refractory castable.

Background technology

The mould material that use at existing domestic new type nonaqueous cement production line kiln hood cover position is high alumina matter material, though the mould material of this kind material is the intensity height at high temperature, wear resistance is good, but high alumina refractories at high temperature forms the mineral facies based on corundum, corundum at high temperature reacts with alkali mutually easily, thereby the generation volumetric expansion deforms, stress concentration appears, consequence such as cause the wadding crack, peel off.Because kiln hood cover place constantly is subjected to washing away of hot grog in the rotary system, adds the frequent variation of thermal parameter, the work-ing life of kiln hood cover top refractory castable is generally shorter, generally about 1 year, has a strong impact on the operation factor of whole kiln system.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of low aluminum-containing mullite refractory castable, and resistance to chemical attack is strong, can not cause the wadding crack and peel off long service life.

For solving above-mentioned prior art problems, the present invention adopts following scheme: a kind of low aluminum-containing mullite refractory castable, and the mass percent that comprises following ingredients and each moiety is:

Mullite M45 and flint clay 70～75%

Porzite powder 10～18%

Pure calcium aluminate cement 6～7%

α-Al ₂O ₃Micro mist 2～4%

Silicon ash 3～5%.

As preferably, the mass percent of described each moiety is:

Mullite M45 and flint clay 70%

Porzite powder 18%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 2%

Silicon ash 3%.

As preferably, the mass percent of described each moiety is:

Mullite M45 and flint clay 73%

Porzite powder 14%

Pure calcium aluminate cement 6%

α-Al ₂O ₃Micro mist 3%

Silicon ash 4%.

As preferably, the mass percent of described each moiety is:

Mullite M45 and flint clay 75%

Porzite powder 10%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 3%

Silicon ash 5%.

Beneficial effect:

The present invention provides a kind of low aluminum-containing mullite refractory castable according to technique scheme, and resistance to chemical attack is strong, can not cause the wadding crack and peel off long service life.The present invention adopts mullite M45, flint clay as aggregate, porzite powder utilizes the anti-thermal shock stability of mullite as powder, improves the thermal shock resistance of mould material, utilize the good alkali-resistivity of porzite powder, improve the chemical resistance of concrete ability and the auxilliary rational structure of mould material.Select α-Al ₂O ₃Micro mist and silicon ash, purpose is to improve the flowing property of mould material, improves intensity.Select pure calcium aluminate cement to guarantee demoulding strength and high temperature use temperature as wedding agent.

Embodiment

Embodiment one:

A kind of low aluminum-containing mullite refractory castable, the mass percent that comprises following ingredients and each moiety is:

Mullite M45 and flint clay 70%

Porzite powder 18%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 2%

Silicon ash 3%.

Mullite M45 is a kind of low aluminium vagcor matrix material.The strict batching of the natural mullite raw material of selected high-quality back high temperature is synthesized into.The technology strictness, iron level is low, and mullitization reaction and host glassization are complete, and the structure ore deposit is stable mutually, and coefficient of thermal expansion is low, compact structure.

Flint clay is the multiple mixture that contains aluminosilicate.Main chemical compositions is Al ₂O ₃And SiO ₂Two kinds of oxide compounds, impurity is mainly the oxide compound of alkali, alkaline earth and iron, titanium etc., and some organism.Various oxide compounds all play fluxing action, can reduce the refractoriness of raw material.

α-Al ₂O ₃Micro mist is common on the market material.More common method be with exsiccated ammonium alum and bicarbonate of ammonia as raw material, prepared a kind of presoma---aluminium carbonate ammonium [NH4AlO (OH) HCO3] of novel aluminum oxide by the precipitator method.Undergo phase transition during this presoma thermal treatment, the process of its phase transformation is: unformed (350 ℃) → γ (700 ℃) → γ+θ (1050 ℃) → θ+α (1100 ℃) → α (1200 ℃) has formed α-Al ₂O ₃Micro mist.

The water that needs to add 2～3% composite additive and 5～6% in construction process mixes and stirs, and described composite additive comprises water reducer, retardant, dispersant with high efficiency, detonation suppressor, and the adding of composite additive can improve workability and use properties.Can also add setting accelerator C ₁₂A ₇Adjust the setting time of mould material.Described low aluminum-containing mullite refractory castable physicochemical property detected result such as table 1:

Table 1

Embodiment two:

Mullite M45 and flint clay 73%

Porzite powder 14%

Pure calcium aluminate cement 6%

α-Al ₂O ₃Micro mist 3%

Silicon ash 4%.

Embodiment three:

Mullite M45 and flint clay 75%

Porzite powder 10%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 3%

Silicon ash 5%.

Claims

1. a low aluminum-containing mullite refractory castable is characterized in that: the matter that comprises following ingredients and each moiety

Amount per-cent is:

Mullite M45 and flint clay 70～75%

Porzite powder 10～18%

Pure calcium aluminate cement 6～7%

α-Al ₂O ₃Micro mist 2～4%

Silicon ash 3～5%.

2. a kind of low aluminum-containing mullite refractory castable according to claim 1 is characterized in that: the mass percent of described each moiety is:

Mullite M45 and flint clay 70%

Porzite powder 18%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 2%

Silicon ash 3%.

3. a kind of low aluminum-containing mullite refractory castable according to claim 1 is characterized in that: the mass percent of described each moiety is:

Mullite M45 and flint clay 73%

Porzite powder 14%

Pure calcium aluminate cement 6%

α-Al ₂O ₃Micro mist 3%

Silicon ash 4%.

4. a kind of low aluminum-containing mullite refractory castable according to claim 1 is characterized in that: the mass percent of described each moiety is:

Mullite M45 and flint clay 75%

Porzite powder 10%

Pure calcium aluminate cement 7%

α-Al ₂O ₃Micro mist 3%

Silicon ash 5%.