CN105347811A - Aluminum-chromium-carbon fireproof material and preparation method thereof - Google Patents

Abstract

The present invention relates to an aluminum-chromium-carbon fireproof material and a preparation method thereof, wherein the aluminum-chromium-carbon fireproof material is prepared from the following components, by weight, 40-90% of bauxite, 10-35% of chromite, 5-20% of graphite, 3-5% of an antioxidant, and a binder having the amount of 3-5% of the total weight of the bauxite, the chromite, the graphite and the antioxidant. According to the present invention, on the basis of retaining of the original advantages of the aluminum-chromium-carbon fireproof material, the comprehensive performance is further improved; and the fireproof material formed by adding the graphite, the antioxidant and the binder has characteristics of high refractoriness, high high-temperature-strength, improved thermal shock stability, and improvement of slag invasion resistance and penetration resistance in a weak reducing gas environment.

Description

A kind of aluminium chromium carbon refractories and preparation method thereof

Technical field

The present invention relates to refractory materials and complete processing field thereof, particularly relate to a kind of aluminium chromium carbon refractories and preparation method thereof.

Background technology

At present, in weak reducing gas part of pyrotic smelting heavy metal, under the envrionment conditions of contact weak base, neutrality and acid slag, the refractory materials of use mainly contains: refractory materials and the goods thereof such as picrochromite material, silicon carbide, carbon brick, alumina chrome brick.Although these refractory materials widespread uses, result of use is under these conditions unsatisfactory.Under low-basicity slag envrionment conditions, there is a large amount of Si0 owing to closing in slag ₂, the magnesium in picrochromite and Si0 ₂after contact, form a large amount of low melting points, thus the fusing point of picrochromite is reduced, pore increases, and permeability resistance and slag resistance obviously decline, and work-ing life shortens.Silicon carbide articles and carbon brick are due to expensive, and the production cost of smelting producer is increased, and financial burden increases the weight of, but the more important thing is, the two all also exists the lighter problem of monomer, easily floating when smelting heavy metal, well can not locate use, and carbon brick also has not oxidation resistant shortcoming.So, under the complicated environmental condition of this pyrotic smelting heavy metal, weak reducing gas part, people's large more options aluminium chromium slag produce alumina chrome brick or with aluminium vanadine add chromite production alumina chrome brick.Although these two kinds of alumina chrome bricks can overcome some shortcoming of picrochromite, silicon carbide and carbon brick, it also easily forms low melting point one calcium aluminate in the environment of contact Ca0 liquation, and it is liquefied under higher than the condition of 1500 DEG C, can not continue to use again.In addition, the thermal shock performance of alumina chrome brick is poor, and namely water logging one certainly cracks, in the process used, easily burst apart, damage fast, the life-span is short, result of use is also undesirable, and the apparent size error of product is larger, after high temperature sintering, product deforms, and error is difficult to reach≤and 1 millimeter, cause certain difficulty to the use of product.

Summary of the invention

The object of the invention is the deficiency overcoming the existence of above-mentioned refractory materials, solve existing refractory materials when smelting heavy metal, anti-weakly alkaline, neutrality and acid slag are indifferent, and under weak reducing gas part, antioxidant property is not good, impermeabilisation, anti-slag are invaded, thermal shock resistance difference and the problem such as body drift, provide a kind of aluminium chromium carbon refractories and preparation method thereof.

A kind of aluminium chromium carbon refractories and preparation method thereof, it is made (by weight percentage) according to following formula:

Aluminium vanadine: 40 ~ 90%;

Chromite: 10 ~ 35%;

Graphite: 5 ~ 20%;

Antioxidant: 3 ~ 5%;

Binding agent: 3 ~ 5% of above-mentioned materials gross weight;

Wherein, aluminium vanadine requires that composition is: AL ₂0 ₃>=70%; Chromite requires that composition is: Cr ₂0 ₃>=40%; Graphite requires that composition is: C>=85%; Above-mentioned composition all by weight percentage.

The invention has the advantages that:

Adopt aluminium chromia material as main raw material, and aluminium chromia material is primarily of aluminum oxide and chromic oxide composition, this two oxides all has rhomboidan, unlimited solid solution can be generated, this sosoloid has good chemical stability, and there is high temperature oxidation resisting, high temperature resistance combustion gas erosion, acidproof, weak base, the performances such as the chemical corrosion of salts solution, and fusing point is high, hardness is large, wear resistance is good, and there is good electrical insulation capability, add graphite wherein, after antioxidant and binding agent, just constitute a kind of new refractory materials, this refractory materials is through overmolding, after dry and high temperature sintering process, new refractory body phase can be formed, its over-all properties is further improved compared with aluminium chrome refractory, it has higher refractoriness and hot strength, inner quality and visual appearance have all had very large improvement than alumina chrome brick, reach the technical requirements of pyrotic smelting heavy metal, that one over-all properties under weak oxide gas part condition is tending towards perfect refractory materials, particularly when vaporization at high temperature, the gas that solid carbon in refractory materials of the present invention produces prevents Ca0 slag to permeate in refractory materials, increase angle of wetting, simultaneously, too increase liquid phase viscosity, and, due to stress-induced phase transformation, cause its inner generation tiny crack, make stress relaxation, thus improve thermal shock resistance, in weak reducing gas part environment, improve alkali-resistivity slag and anti-permeability performance.

Embodiment

Embodiment 1:

Aluminium vanadine, chromite, graphite and antioxidant metallic aluminium that composition symbol house requires are pulverized respectively, the granularity that aluminium vanadine is pulverized is: 1 ~ 10 millimeter, the granularity that chromite is pulverized is: 1 ~ 5 millimeter, the granularity that graphite is pulverized is 0.5 millimeter, and the granularity that antioxidant metallic aluminium is pulverized is≤1 millimeter; Above-mentioned materials is carried out magnetic separation process respectively, removes ferromagnetic material wherein; Then, get aluminium vanadine 670Kg, chromite 240Kg, graphite 70Kg, metallic aluminium 20Kg, organic binder bond 40Kg mix, stir and be aluminium chromium carbon refractories.

Embodiment 2:

Satisfactory for composition aluminium vanadine, chromite, graphite, antioxidant Pure Silicon Metal are pulverized respectively, the granularity of pulverizing is identical with embodiment 4; Again above-mentioned materials is carried out magnetic separation process respectively, remove ferromagnetic material wherein; Then, get aluminium vanadine 700Kg, chromite 220Kg, graphite 60Kg, antioxidant Pure Silicon Metal 40Kg, mineral binder bond aluminum phosphate 30Kg mix, stir and be aluminium chromium carbon refractories.

Embodiment 3:

Satisfactory for composition aluminium vanadine, chromite, graphite, antioxidant Pure Silicon Metal are pulverized respectively, the granularity of pulverizing is identical with embodiment 1; Again above-mentioned materials is carried out magnetic separation process respectively, remove ferromagnetic material wherein; Then, get aluminium vanadine 675Kg, chromite 220Kg, graphite 60Kg, antioxidant metallic aluminium 30Kg, mineral binder bond aluminum phosphate 30Kg mix, stir and be refractory Al-Cr-C material.

Above-mentioned refractory Al-Cr-C material after shaping, drying, then through 1200-1500 DEG C of high temperature sintering, can obtain the various moulded products of refractory Al-Cr-C material.

Claims (1)

1. aluminium chromium carbon refractories and preparation method thereof, is characterized in that, it is made (by weight percentage) according to following formula:

Aluminium vanadine: 40 ~ 90%;

Chromite: 10 ~ 35%;

Graphite: 5 ~ 20%;

Antioxidant: 3 ~ 5%;

Binding agent: 3 ~ 5% of above-mentioned materials gross weight;

Wherein, aluminium vanadine requires that composition is: AL ₂0 ₃>=70%; Chromite requires that composition is: Cr ₂0 ₃>=40%; Graphite requires that composition is: C>=85%; Above-mentioned composition all by weight percentage.