阅读说明：本技术 一种六铝酸钙不沾铝浇注料 (Calcium hexaluminate castable not sticky to aluminum ) 是由 许锴 于 2020-08-20 设计创作，主要内容包括：本发明涉及浇注料技术领域,尤其涉及一种六铝酸钙不沾铝浇注料,由如下组分组成:六铝酸钙骨料57～75份；煅烧氧化铝10～15份；氧化铝水泥5～10份；白刚玉10～15份；减水剂0.1～0.15份,本发明通过合理的配方设计,在不添加铝液湿润剂的前提下制备的六铝酸钙浇注料具有优异的耐压强度、抗压强度以及抗铝液渗透性能,从而避免了现有熔铝浇注料中需要添加湿润剂来提高抗铝液渗透能力的问题,以及因添加湿润剂所带来的环境问题和对熔铝操作工身体造成的伤害问题,同时避免了因添加湿润剂所带来的搅拌分散难,施工搅拌均匀难等问题。(The invention relates to the technical field of casting materials, in particular to a calcium hexaluminate non-stick aluminum casting material which comprises 57-75 parts of calcium hexaluminate aggregate; 10-15 parts of calcined alumina; 5-10 parts of alumina cement; 10-15 parts of white corundum; 0.1-0.15 part of water reducing agent, and the calcium hexaluminate castable prepared by the method has excellent compressive strength, compressive strength and aluminum liquid permeation resistance on the premise of not adding aluminum liquid wetting agent through reasonable formula design, thereby avoiding the problems that the aluminum liquid permeation resistance is improved by adding the wetting agent in the existing aluminum melting castable, environmental problems caused by adding the wetting agent and the damage to the body of an aluminum melting operator, and simultaneously avoiding the problems of difficult stirring dispersion, difficult construction stirring uniformity and the like caused by adding the wetting agent.)

1. The calcium hexaluminate non-stick aluminum castable is characterized by comprising the following components:

57-75 parts of calcium hexaluminate aggregate;

10-15 parts of calcined alumina;

5-10 parts of alumina cement;

10-15 parts of white corundum;

0.1-0.15 part of water reducing agent.

2. The calcium hexaluminate non-staining aluminum castable material as claimed in claim 1, wherein the calcium hexaluminate aggregate is composed of calcium hexaluminate with particle size of 8-5 mm, calcium hexaluminate with particle size of 5-3 mm, calcium hexaluminate with particle size of 3-1 mm, and calcium hexaluminate with particle size of 1-0 mm.

3. The calcium hexaluminate non-staining aluminum castable material as claimed in claim 2, wherein the weight ratio of calcium hexaluminate with particle size of 8-5 mm, calcium hexaluminate with particle size of 5-3 mm, calcium hexaluminate with particle size of 3-1 mm, and calcium hexaluminate with particle size of 1-0 mm in the calcium hexaluminate aggregate is 10-15: 15-20: 12-15: 20 to 25.

4. The calcium hexaluminate non-stick aluminum castable according to claim 1, wherein the particle size of the calcined alumina is 2-3 μm, and the particle size of the white corundum is 0.08 mm.

5. The calcium hexaluminate non-stick aluminum castable according to claim 1, wherein the water reducing agent is one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate and sodium superphosphate.

6. The calcium hexaluminate non-staining aluminum castable material of claim 1, wherein the alumina cement is pure calcium aluminate cement.

7. The preparation method of the calcium hexaluminate non-stick aluminum castable material according to any one of claims 1 to 6, comprising the following steps:

s1, mixing the raw materials according to a certain weight percentage, and then putting the mixture into a forced mixer for premixing to obtain a semi-finished product;

and S2, adding water into the semi-finished product, stirring, casting, curing, drying and baking.

8. The preparation method of the calcium hexaluminate castable material non-sticky to aluminum according to claim 7, wherein in step S1, the premixing time is 3-5 min, in step S2, the amount of water added is 6-6.5% of the total amount of raw materials, the stirring time is 3-5 min, the construction environment temperature for casting molding is 10-25 ℃, the curing is performed under natural conditions, and the curing time is 72 h.

9. The method for preparing the aluminum hexaluminate castable non-sticky to aluminum according to claim 7, wherein in step S2, the baking temperature is 800-1400 ℃.

Technical Field

The invention relates to the technical field of casting materials, in particular to a calcium hexaluminate casting material which is not sticky to aluminum.

Background

The aluminum melting refractory material has low use temperature, poor strength at medium temperature in use and easy neutralization with SiO in the material₂The production of corundum tumor by reaction, the infiltration of refractory material by additive in the process of melting aluminium and the infiltration of aluminium water all put strict requirements for the use of aluminium-melting refractory material, so that it is necessary to raise intermediate-temp. strength, reduce porosity and reduce silicon content, and can raise aluminium-liquid-permeation-resisting capacityThe use of aluminum-resistant wetting agents can adversely affect the environment.

In view of the above problems, the present invention seeks to provide a castable material which has aluminum liquid corrosion and infiltration resistance without adding an aluminum liquid immersion-resistant agent.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a calcium hexaluminate non-sticky aluminum castable.

A calcium hexaluminate non-stick aluminum castable comprises the following components:

57-75 parts of calcium hexaluminate aggregate;

10-15 parts of calcined alumina;

5-10 parts of alumina cement;

10-15 parts of white corundum;

0.1-0.15 part of water reducing agent.

Preferably, the calcium hexaluminate aggregate is composed of calcium hexaluminate with the granularity of 8-5 mm, calcium hexaluminate with the granularity of 5-3 mm, calcium hexaluminate with the granularity of 3-1 mm and calcium hexaluminate with the granularity of 1-0 mm.

Preferably, in the calcium hexaluminate aggregate, the weight ratio of calcium hexaluminate with the particle size of 8-5 mm, calcium hexaluminate with the particle size of 5-3 mm, calcium hexaluminate with the particle size of 3-1 mm and calcium hexaluminate with the particle size of 1-0 mm is 10-15: 15-20: 12-15: 20 to 25.

Preferably, the particle size of the calcined alumina is 2-3 μm, and the particle size of the white corundum is 0.08 mm.

Preferably, the water reducing agent is one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate and sodium superphosphate.

Preferably, the alumina cement is pure calcium aluminate cement.

Preferably, the preparation method of the calcium hexaluminate non-stick aluminum castable comprises the following steps:

s1, mixing the raw materials according to a certain weight percentage, and then putting the mixture into a forced mixer for premixing to obtain a semi-finished product;

and S2, adding water into the semi-finished product, stirring, casting, curing, drying and baking.

Preferably, in the step S1, the premixing time is 3-5 min, in the step S2, the addition amount of water is 6-6.5% of the total amount of the raw materials, the stirring time is 3-5 min, the construction environment temperature of the casting molding is 10-25 ℃, the curing is performed under natural conditions, and the curing time is 72 h.

Preferably, in the step S2, the baking temperature is 800 to 1400 ℃.

The invention has the beneficial effects that:

1. according to the invention, through reasonable formula design, the calcium hexaluminate castable prepared on the premise of not adding a aluminum liquid wetting agent has excellent compressive strength, compressive strength and aluminum liquid permeation resistance, so that the problems that the aluminum liquid permeation resistance is improved by adding the wetting agent in the conventional aluminum melting castable, the environmental problem and the damage to the body of an aluminum melting operator caused by adding the wetting agent are solved, and the problems of difficult stirring dispersion, difficult construction stirring, and the like caused by adding the wetting agent are solved.

2. The invention utilizes the anti-infiltration effect of calcium hexaluminate on aluminum, introduces the calcium hexaluminate as aggregate into the castable, and applies the aggregate to the contact part of the aluminum melting furnace and the aluminum liquid, thereby realizing excellent anti-aluminum liquid infiltration and anti-infiltration effects, and the obtained calcium hexaluminate castable has low use density.

3. The invention has the advantages of large formula design expansion degree, simple production process, easy quality control and convenient construction, and is suitable for any part (including a transfer ladle, an aluminum water flow groove, a degassing box, a filter box and the like) contacted with molten aluminum.

In conclusion, compared with the existing castable, the calcium hexaluminate castable has the advantages of small environmental pollution, low raw material cost, good heat insulation performance, capability of ensuring the product quality, low energy consumption and convenience for popularization and application in the aluminum melting industry.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.