CN102992787A - Special zirconium oxide fireproof brick for liner layer of smelting kiln - Google Patents

Abstract

The invention provides a special zirconium oxide fireproof brick for a liner layer of a smelting kiln. The formula of raw materials comprises bauxite clinkers, zircon sand, floating beads, white corundum, silicon carbide, mullite and quartz sand. A preparation method comprises the following steps of: step 1, weighing the raw materials in ratio; adding the bauxite clinkers, the zircon sand, the floating beads and the white corundum into an enforced type agitator and sufficiently agitating; then, adding the silicon carbide and the mullite; adding water and wetting; continually agitating till sufficiently and uniformly mixing to prepare a semi-dry mixture; step 2, utilizing a pressure brick making machine to treat the semi-dry mixture prepared by the step into a blank of the zirconium oxide fireproof brick, wherein the molding pressure is more than 515 tons; and step 3, placing the blank of the zirconium oxide fireproof brick prepared by the step 2 on a low-temperature kiln, calcining at 1500-1600 DEG C and molding to obtain the finished product of the zirconium oxide fireproof brick. In a sintering process of the zirconium oxide fireproof brick, a silicon dioxide glaze layer is smelted and formed on the surface layer of the fire-facing surface of the fireproof brick, so that the wear resistance of the whole liner is improved and the service life of the kiln is obviously prolonged.

Description

The special-purpose zirconium white refractory brick of smelting kiln inner lining of furnace layer

Technical field

The present invention relates to build by laying bricks or stones the special-purpose zirconium white refractory brick of industrial smelting kiln inner lining of furnace layer field, be specifically related to a kind of zirconium white refractory brick and preparation method who builds iron and steel smelting furnace, limestone kiln, bauxitic clay calcining kiln air retaining wall by laying bricks or stones.

Background technology

The calcining furnace liner of iron and steel smelting furnace, bauxitic clay calcining kiln, active stone calcining ash furnace needs preferably fire performance and wear resisting property.Quickened lime is mainly used in the smelting iron and steel industry, and along with the lifting of iron and steel output, the consumption of quickened lime is increasing.In the prior art, the kiln that is used for the quickened lime calcining mainly contains shaft kiln, rotary kiln etc.The liner tile of building iron and steel smelting furnace, shaft kiln (for example bauxitic clay calcining kiln), rotary kiln by laying bricks or stones is common alumina firebrick, and the intensity of this refractory brick only has 40-45mPa, only have 3-6 month wearing coefficient 〉=6.2 work-ing lifes, and cost is high.In addition, when this refractory brick was the liner of shaft kiln, rotary kiln, the quickened lime that burns till contained P, had reduced the quality of iron and steel.

Summary of the invention

The object of the present invention is to provide a kind of iron and steel smelting furnace, limestone kiln, the special-purpose zirconium white refractory brick of bauxitic clay calcining kiln air retaining wall and preparation method of building by laying bricks or stones, to overcome the defective that exists in the prior art.

The present invention has adopted following technical scheme: the composition of raw materials of described zirconium white refractory brick, specification and weight part are respectively:

Bauxitic clay grog---specification 0.1-1mm---weight part 10-20 part;

Zircon sand---specification 1.1-3mm---weight part 10-25 part;

Zircon sand---specification 3.1-5mm---weight part 10-15 part;

Float pearl---weight part 4-6.5 part;

White fused alumina---specification 0.043mm---weight part 5-8 part;

Silicon carbide---specification 0.075mm---weight part 3-5 part;

Mullite---specification 0.088mm---weight part 8-10 part;

Quartz sand---specification 1-3mm---weight part 4-6.5 part.

The preparation method of zirconium white refractory brick of the present invention:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, zircon sand, float pearl, white fused alumina joins in the forced mixer, fully stirring; Add silicon carbide, mullite, it is moistening to add water again, continues to be stirred to fully to mix, and makes half dry mix;

Step 2, half dry mix that step 1 is made, with the blank of pressure brick press oxygenerating zirconium refractory brick, forming pressure is greater than 515 tons;

The blank of step 3, zirconium white refractory brick that step 2 is made places the low temperature kiln, through 1500-1600 ℃ of calcining moulding, can obtain the finished product of zirconium white refractory brick.

Through the contriver repeatedly grope and test discovery, the zirconium white refractory brick that described composition of raw materials, specification and weight part are made in above-mentioned scope all has good Performance and quality stability.

Pulverize the pulvis of the different size that obtains after the i.e. industry of bauxite clinker described in the present invention alumina calcining commonly used, also claim the bauxitic clay grog.The bauxitic clay grog is divided into different grades, determines according to its aluminum content, is divided into: superfine bauxitic clay grog, one-level bauxitic clay grog, secondary first bauxitic clay grog, secondary second bauxitic clay grog, three grades of bauxitic clay grogs.Each bauxite clinker of the present invention refers to superfine bauxitic clay grog.

Zircon sand: the symbiosis such as the many and ilmenite of zircon sand (zircon), rutile, monazite, xenotime obtain after the ore-dressing technique sortings such as wet concentration, electric separation, magnetic separation in the sand of beach.Its theory consists of: ZrO2:67.1%; SiO2:32.9%.Pure zircon sand is water white crystal, often because the place of production is different, impure kind and different amts dyed Huang, orange, red, brown isochrome, and hardness 7.8, proportion 4.6-4.71, specific refractory power 1.93-2.01, fusing point are 2550 ℃.Zircon is used for refractory materials and (claims zirconia refractory, such as zircon corundum brick, zirconium matter refractory fibre), casting industry casting mold sand (precision casting molding sand), accurate enamel utensil also is used for the production of glass, metal (zirconium sponge) and zirconium compounds (zirconium dioxide, basic zirconium chloride, sodium zirconate, potassium fluozirconate, zirconium sulfate etc.) in addition.Take zircon (ZrO2SiO2) as main component, contain the refractory product of ZrO2 about 65%.The good thermal shock stability of brick has good chemical stability, wear resistance and alkali resistance scouring, is mainly used in steel teeming ladle, continuous casting tundish and glass melter etc.

Float pearl: the main chemical compositions of floating pearl is the oxide compound of silicon, aluminium, and wherein silicon-dioxide is about 50-65%, and aluminium sesquioxide is about 25-35%.Because silicon-dioxide is molten up to 1725 degree Celsius, the molten point of aluminium sesquioxide is 2050 degree Celsius, is high refractory substance.Therefore, float pearl and have high refractoriness, generally reach 1600-1700 degree Celsius, make it become excellent high-performance refractory material.Light weight, heat insulating.Floating the thin hollow of pearl wall, is the partial vacuum in the cavity, only has the gas (N2, H2 and CO2 etc.) of denier, and thermal conduction is atomic extremely slowly.So float pearl not only light weight (unit weight 250-450 kilogram/m3), and heat insulating excellent (thermal conductivity normal temperature 0.08-0.1), this exhibits one's skill to the full in the light heat insulating material field for it and lays a good foundation.Hardness is large, intensity is high.Be the stiff glass body that forms with sieve and silica-sesquioxide mineral facies (quartz and mullite) owing to float pearl, hardness can reach Mohs 6-7 level, and isostatic pressing strength is up to 70-140MPa, true density 2.10-2.20 gram/cm3, and rock is suitable.Therefore, float pearl and have very high intensity.The granularity of floating the pearl self-assembling formation is the 1-250 micron.Specific surface area 300-360cm2/g, and cement is similar.Therefore, floating pearl does not need grinding, can directly use.Fineness can satisfy the needs of various goods.

White fused alumina is take the commercial alumina powder as raw material, cools off behind the above high melt of 2000 degree in electric arc and makes, and through pulverizing shaping, the magnetic separation de-iron is sieved into multiple granularity, and its quality is fine and close, hardness is high, and particle shape becomes tip-angled shape; Be applicable to make pottery, resin bonded grinding tool and grinding, polishing, sandblast, precision casting (the special-purpose corundum of smart casting) etc., also can be used for making high grade refractory.

Silicon carbide is SILICA FUME, can the intergranular hole of filling concrete, simultaneously and hydrated product generate gelinite, generate gelinite with the reaction of basic material magnesium oxide.In concrete, mortar and the refractory material casting material of cement based, mix an amount of silicon ash, can function as follows: 1, significantly improve resistance to compression, anti-folding, impervious, anticorrosion, shock resistance and wear resisting property.2, have water conservation, prevent from emanating, bleeding, significantly reduce the effect of concrete pumping resistance.3, the work-ing life of significant prolongation concrete.Particularly pollute under the severe environment such as erosion, sulphate attack, high humidity at villaumite, the weather resistance of concrete is doubled even several times.4, decrease sprays the ash that lands of concrete and mould material, improves the single jetting thickness.5, be the necessary composition of High Strength Concrete, the engineering of existing C150 concrete is used.6, the effect that has about 5 times of cement is used in ordinary concrete and low cement deposit material and can be reduced cost. improve weather resistance.7, effectively prevent the concrete alkali-aggregate reaction.8, improve the compactness of casting type refractory materials.With Al2O3 and when depositing, easier generation mullite phase makes its hot strength, and the enhancing of shaking property of heat resistanceheat resistant occupies an important position in this present invention.

Mullite is the mineral that aluminosilicate at high temperature generates, and can form mullite during the Heat artificially aluminosilicate.Natural mullite crystal is elongated needle-like and is radiation bunch shape.The mullite ore deposit is used to produce high-temperature refractory.

Quartz sand: refractory materials quartz sand is as main component take quartz sand.Add different additive according to various demands.Scientific matching forms.The advantage price is low, and acid resistance is good, not dry slag.Various essential materials for the Metal Melting Induction Furnace liner.

By the zirconium white refractory brick finished product that composition of raw materials of the present invention and preparation method obtain, through the laboratory inspection test, its physical and chemical index is following data:

Wearing coefficient 〉=9.2.

Contain zirconium white 67.23%;

Silicon oxide 32.77%;

Coefficient of expansion during 7.5,20～1000 ℃ of Mohs' hardness is 4.2 * 10-6/ ℃;

2430 ℃ of fusing points;

Volume density 3.60～4.3g/cm3;

Apparent porosity 0%～18%;

Refractoriness under load＞1550 ℃;

The common alumina firebrick that uses in the above data presentation, zirconium white refractory brick of the present invention and prior art is compared, and has compressive strength and the wear resisting property of clear superiority.

Embodiment

Composition of raw materials, specification and the weight part of the special-purpose zirconium white refractory brick of described smelting kiln inner lining of furnace layer are respectively:

Bauxitic clay grog---specification 0.1-1mm---weight part 10-20 part;

Zircon sand---specification 1.1-3mm---weight part 10-25 part;

Zircon sand---specification 3.1-5mm---weight part 10-15 part;

Float pearl---weight part 4-6.5 part;

White fused alumina---specification 0.043mm---weight part 5-8 part;

Silicon carbide---specification 0.075mm---weight part 3-5 part;

Mullite---specification 0.088mm---weight part 8-10 part;

Quartz sand---specification 1-3mm---weight part 4-6.5 part.

The preparation method of zirconium white refractory brick of the present invention:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, zircon sand, float pearl, white fused alumina joins in the forced mixer, fully stirring; Add silicon carbide, mullite, it is moistening to add water again, continues to be stirred to fully to mix, and makes half dry mix;

Step 2, half dry mix that step 1 is made, with the blank of pressure brick press oxygenerating zirconium refractory brick, forming pressure is greater than 515 tons;

The blank of step 3, zirconium white refractory brick that step 2 is made places the low temperature kiln, through 1500-1600 ℃ of calcining moulding, can obtain the finished product of zirconium white refractory brick.

The finished product of the zirconium white refractory brick that obtains is through the laboratory inspection test, and its physical and chemical index is identical with the described data of foregoing invention content.Find by the application as liner tile on iron and steel smelting furnace, bauxitic clay calcining kiln, lime vertical kiln of zirconium white refractory brick, described zirconium white refractory brick is in sintering process, the clinkering of abrasive brick side towards the fire top layer forms silicon-dioxide glaze layer, improve the wear resisting property of integral lining, obviously prolonged the work-ing life of kiln.

Claims (2)

1. the special-purpose zirconium white refractory brick of a smelting kiln inner lining of furnace layer is characterized in that its composition of raw materials, specification and weight part are respectively:

Bauxitic clay grog---specification 0.1-1mm---weight part 10-20 part;

Zircon sand---specification 1.1-3mm---weight part 10-25 part;

Zircon sand---specification 3.1-5mm---weight part 10-15 part;

Float pearl---weight part 4-6.5 part;

White fused alumina---specification 0.043mm---weight part 5-8 part;

Silicon carbide---specification 0.075mm---weight part 3-5 part;

Mullite---specification 0.088mm---weight part 8-10 part;

Quartz sand---specification 1-3mm---weight part 4-6.5 part.

2. according to zirconium white refractory brick claimed in claim 1, it is characterized in that the preparation method:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, zircon sand, float pearl, white fused alumina joins in the forced mixer, fully stirring; Add silicon carbide, mullite, it is moistening to add water again, continues to be stirred to fully to mix, and makes half dry mix;

Step 2, half dry mix that step 1 is made, with the blank of pressure brick press oxygenerating zirconium refractory brick, forming pressure is greater than 515 tons;

The blank of step 3, zirconium white refractory brick that step 2 is made places the low temperature kiln, through 1500-1600 ℃ of calcining moulding, can obtain the finished product of zirconium white refractory brick.