CN101397213A

CN101397213A - Corundum-mullite self-flow refractory castable

Info

Publication number: CN101397213A
Application number: CNA2008101219720A
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: 2009-04-01

Abstract

The invention discloses a corundum mullite artesian fireproof casting material, which comprises 30-35% of plate-shaped corundum, 5-8% of carborundum powder material, 4-5% of pure calcium aluminate cement, 35-45% of mullite, 10-15% of alpha-Al2O3 micropowder and 3-5% of bonite by mass percentage. The casting material is characterized by good fluidity, good resistance to thermal shock, low porosity rate of entity after casting, good chemical resistance, high intensity and long service life.

Description

A kind of corundum-mullite self-flow refractory castable

Technical field

The present invention relates to refractory castable, particularly a kind of corundum-mullite self-flow refractory castable.

Background technology

Weakness such as this flowability of existing refractory castable ubiquity is poor, thermal shock resistance difference, when construction, need add more water, in the construction process workmen also forever vibrating head constantly vibrate mould material is filled in the film cavity, pour into a mould the entity that obtains like this, be easy to generate consequences such as void content height, resistance to chemical corrosion is poor, intensity is low, restricted the work-ing life of refractory castable in actual engineering, particularly when privileged sites such as complex-shaped, the thin-walled of cast, its work-ing life is shorter.Such as existing coal powder injection pipe refractory castable has only three months work-ing life, and the refractory materials of kiln hood cover and kilneye also has only five months its work-ing life.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of corundum-mullite self-flow refractory castable, good fluidity, and good thermal shock stability, the entity void content that obtains after the cast is low, resistance to chemical corrosion good, intensity is high, long service life.

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

Plate diamond spar 30～35%

Sic powder 5～8%

Pure calcium aluminate cement 4～5%

Mullite 35～45%

α-Al ₂O ₃Micro mist 10～15%

Bo Naite 3～5%.

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

Plate diamond spar 30%

Sic powder 8%

Pure calcium aluminate cement 4%

Mullite 45%

α-Al ₂O ₃Micro mist 10%

Bo Naite 3%.

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

Plate diamond spar 33%

Sic powder 7%

Pure calcium aluminate cement 4%

Mullite 40%

α-Al ₂O ₃Micro mist 12%

Bo Naite 4%.

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

Plate diamond spar 35%

Sic powder 5%

Pure calcium aluminate cement 5%

Mullite 35%

α-Al ₂O ₃Micro mist 15%

Bo Naite 5%.

Beneficial effect:

The present invention provides a kind of corundum-mullite self-flow refractory castable according to technique scheme, good fluidity, and good thermal shock stability, the entity void content that obtains after the cast is low, resistance to chemical corrosion good, intensity is high, long service life.The present invention adopts plate diamond spar, mullite as aggregate, and silicon carbide, Bo Naite be as powder, utilizes plate diamond spar to satisfy 1100 ℃～1500 ℃ use temperature; Utilize the anti-thermal shock stability of mullite, improve the thermal shock resistance of refractory castable; The premium properties that utilizes carbofrax material is to satisfy slag resistance, wear resistance; Utilize the good alkali-resistivity of Bo Naite, improve the resistance to chemical corrosion of mould material.Select α-Al ₂O ₃Micro mist, purpose are to improve the flowing property of mould material, improve the intensity of pour mass.Select pure calcium aluminate cement to guarantee demoulding strength and high temperature use temperature as wedding agent.

Embodiment

Embodiment one:

A kind of corundum-mullite self-flow refractory castable, the mass percent that comprises following ingredients and each moiety is:

Plate diamond spar 30%

Sic powder 8%

Pure calcium aluminate cement 4%

Mullite 45%

α-Al ₂O ₃Micro mist 10%

Bo Naite 3%.

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.

Bo Naite is based on a kind of novel synthesis of densified refractory aggregate of calcium hexaluminate CA6 mineral facies.The plate diamond spar of borolon base and spinel are the fine and close aggregates of preparation high-performance aluminum oxide refractory materials, these aggregates and matrix fine powder are as the calcining activated alumina, the compound preparation refractory castable of aluminous cement and dispersed aluminum oxide, when temperature is higher than 1300 ℃, in aluminous cement bonded mould material, will form calcium hexaluminate mineral facies (CaO+6Al2O3=CA6).

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.

Only need Zhi Haomo during construction, inject in the mould adding the gravity flow pouring material that water stirs, just can flow through any surface and fill any space of material, and bonding rapidly with former surplus material, save materials, do not need to vibrate, noiselessness reduces labor strength simultaneously.

Described corundum-mullite self-flow refractory castable physicochemical property detected result such as table 1:

Table 1

Embodiment two:

Plate diamond spar 33%

Sic powder 7%

Pure calcium aluminate cement 4%

Mullite 40%

α-Al ₂O ₃Micro mist 12%

Bo Naite 4%.

Embodiment three:

Plate diamond spar 35%

Sic powder 5%

Pure calcium aluminate cement 5%

Mullite 35%

α-Al ₂O ₃Micro mist 15%

Bo Naite 5%.

Claims

1. corundum-mullite self-flow refractory castable, it is characterized in that: the mass percent that comprises following ingredients and each moiety is:

Plate diamond spar 30～35%

Sic powder 5～8%

Pure calcium aluminate cement 4～5%

Mullite 35～45%

α-Al ₂O ₃Micro mist 10～15%

Bo Naite 3～5%.

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

Plate diamond spar 30%

Sic powder 8%

Pure calcium aluminate cement 4%

Mullite 45%

α-Al ₂O ₃Micro mist 10%

Bo Naite 3%.

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

Plate diamond spar 33%

Sic powder 7%

Pure calcium aluminate cement 4%

Mullite 40%

α-Al ₂O ₃Micro mist 12%

Bo Naite 4%.

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

Plate diamond spar 35%

Sic powder 5%

Pure calcium aluminate cement 5%

Mullite 35%

α-Al ₂O ₃Micro mist 15%

Bo Naite 5%.