CN103011851A - Mullite-silicon-corundum abrasive brick and manufacturing method thereof - Google Patents

Abstract

The invention relates to a mullite-silicon-corundum abrasive brick and a manufacturing method thereof. The mullite-silicon-corundum abrasive brick comprises the following components: bauxite clinker, silica sand, white corundum, carborundum, mullite and zircon sand. The manufacturing method of the mullite-silicon-corundum abrasive brick comprises the following steps of: 1, weighing the raw materials in proportion, adding the bauxite clinker and the silica sand into a forced mixer first and sufficiently mixing; then adding the white corundum, the carborundum, the mullite and the zircon sand, and continuously stirring to sufficiently and uniformly mix to obtain a mixture; 2, making a blank of the mullite-silicon-corundum abrasive brick by using the mixture prepared in the step 1 by using a pressure brick making machine, wherein the forming pressure is larger than 315 tons; and 3, putting the blank of the mullite-silicon-corundum abrasive brick, which is made in the step 2, into a low temperature kiln, and calcining and moulding the mullite-silicon-corundum abrasive brick at the temperature of 1550-1600 DEG C to obtain a finished product of the mullite-silicon-corundum abrasive brick.

Description

Not silicon corundum abrasive brick and preparation method

Technical field

The present invention relates to build by laying bricks or stones industrial kiln refractory brick field, be specifically related to a kind of not silicon corundum abrasive brick and preparation method who builds limestone kiln, bauxitic clay calcining kiln by laying bricks or stones.

Background technology

The calcining furnace liner of 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 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 limestone kiln, the special use of bauxitic clay calcining kiln not silicon corundum abrasive brick 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: composition of raw materials and the weight part of described not silicon corundum abrasive brick are respectively:

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

Bauxitic clay grog---specification 1.1-3mm---weight part 10-25 part;

Bauxitic clay grog---specification 3.1-5mm---weight part 10-15 part;

Quartz sand---specification 1-3mm---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;

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

The preparation method of not silicon corundum abrasive brick of the present invention:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, quartz sand are joined in the forced mixer, fully stirring; Add again white fused alumina, silicon carbide, mullite, zircon sand, continue to be stirred to fully and mix, make compound;

Step 2, the compound that step 1 is made, with the pressure brickmaking mechanism blank of silicon corundum abrasive brick not, forming pressure is greater than 315 tons;

The blank of step 3, not silicon corundum abrasive brick that step 2 is made places the low temperature kiln, through 1550-1600 ℃ of calcining moulding, can obtain the not finished product of silicon corundum abrasive brick.

Through the contriver repeatedly grope and test discovery, the not silicon corundum abrasive brick that described composition of raw materials and weight part are made in above-mentioned scope all has good Performance and quality stability.

1. bauxite clinker, 2. bauxite clinker, 3. bauxite clinker described in the present invention are pulverized the pulvis of the different size that obtains after the i.e. industry 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.

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.

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.

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.

By the not silicon corundum abrasive 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:

Contain zirconium white 7.23%;

AL2O3≥65％；

SiC+SiO2≥25％；

Apparent porosity≤20%;

0.2mPa loading softening begins 1600 ℃ of temperature;

Cold crushing strength 〉=85mPa;

Thermostability (1100 ℃ of water-cooleds) 〉=20 times;

Volume density 〉=2.65g/cm;

Line changes 1600 ℃-0.3 after burning;

Wearing coefficient 〉=9.2.

The common alumina firebrick that uses in the above data presentation, not silicon corundum abrasive 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 and the weight part of described not silicon corundum abrasive brick are respectively:

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

Bauxitic clay grog---specification 1.1-3mm---weight part 10-25 part;

Bauxitic clay grog---specification 3.1-5mm---weight part 10-15 part;

Quartz sand---specification 1-3mm---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;

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

The preparation method of not silicon corundum abrasive brick of the present invention:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, quartz sand are joined in the forced mixer, fully stirring; Add again white fused alumina, silicon carbide, mullite, zircon sand, continue to be stirred to fully and mix, make compound;

Step 2, the compound that step 1 is made, with the pressure brickmaking mechanism blank of silicon corundum abrasive brick not, forming pressure is greater than 315 tons;

The blank of step 3, not silicon corundum abrasive brick that step 2 is made places the low temperature kiln, through 1550-1600 ℃ of calcining moulding, can obtain the not finished product of silicon corundum abrasive brick.

The not finished product process laboratory inspection test of silicon corundum abrasive brick that obtains, its physical and chemical index is identical with the described data of foregoing invention content.Find by the application as liner tile on lime vertical kiln of silicon corundum abrasive brick not, described not silicon corundum abrasive brick is in the lime sintering process, the clinkering of abrasive brick side towards the fire top layer forms silicon-dioxide glaze layer, has improved the wear resisting property of integral lining, has obviously prolonged the work-ing life in limestone kiln.

Claims (2)

1. silicon corundum abrasive brick not 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;

Bauxitic clay grog---specification 1.1-3mm---weight part 10-25 part;

Bauxitic clay grog---specification 3.1-5mm---weight part 10-15 part;

Quartz sand---specification 1-3mm---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;

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

2. according to not silicon corundum abrasive brick claimed in claim 1, it is characterized in that, not the preparation method of silicon corundum abrasive brick:

Step 1, proportionally take by weighing above-mentioned raw materials, first bauxitic clay grog, quartz sand are joined in the forced mixer, fully stirring; Add again white fused alumina, silicon carbide, mullite, zircon sand, continue to be stirred to fully and mix, make compound;

Step 2, the compound that step 1 is made, with the pressure brickmaking mechanism blank of silicon corundum abrasive brick not, forming pressure is greater than 315 tons;

The blank of step 3, not silicon corundum abrasive brick that step 2 is made places the low temperature kiln, through 1550-1600 ℃ of calcining moulding, can obtain the not finished product of silicon corundum abrasive brick.