CN102030552A

CN102030552A - High-aluminum homogeneity-material chromic-oxide zirconium-oxide system abrasion resistant cast material

Info

Publication number: CN102030552A
Application number: CN 201010535390
Authority: CN
Inventors: 占华生; 康振杰; 刘淑焕; 赵燕; 李燕京; 王林俊; 李平
Original assignee: TONGDA REFRACTORY TECHNOLOGIES Co Ltd
Current assignee: Beijing Jinyu Tongda refractory Technology Co.,Ltd.
Priority date: 2010-11-03
Filing date: 2010-11-03
Publication date: 2011-04-27
Anticipated expiration: 2030-11-03
Also published as: CN102030552B

Abstract

The invention provides a high-aluminum-homogeneity-material chromic-oxide zirconium-oxide system abrasion resistant cast material which belongs to the field of high-temperature abrasion resistant fireproof materials. The raw material comprises a high aluminum homogeneity material, aluminum oxide micro powder, silicon dioxide micro powder, pure calcium aluminate micro power, chromic oxide, zirconium oxide and a polycarboxylic acid dispersing agent, wherein the high aluminum homogeneity material contains 70 to 90 percent of Al2O3 with the volume density of 2.9 to 3.5 g/cm3. The invention is characterized in that: the high-aluminum-homogeneity-material chromic-oxide zirconium-oxide system abrasion resistant cast material is made of the artificially synthesized homogeneity material with low water absorption rate, low porosity and good uniformity instead of conventional sintered alumina clinker with high water absorption rate, high porosity and poor uniformity or a corundum-mullite composite system. By employing a casting construction method, the material has good construction property, high strength, high abrasion resistance and excellent on-site use effect, is favorable for prolonging the service life of a furnace lining and improving the utilization efficiency of a high temperature kiln, and is widely used in parts, which are easily abraded, penetrated and eroded, of thermal equipment, such as blast furnaces, cowper stoves, recirculating fluidized beds, garbage incinerators, catalytic cracking units and the like.

Description

A kind of high alumina homogeneous material-chromic oxide-zirconium white is a wear-resistant castable

Technical field

The invention belongs to high-temperature wearable refractory castable field, particularly invented the synthetic homogeneous material that adopts low water absorption, low porosity and high uniformity and substituted the natural matter of sintering bauxite clinker of traditional high water absorbing capacity, high porosity and lack of homogeneity or the compound material system of corundum and mullite, to have developed high alumina homogeneous material-chromic oxide-zirconium white be high wear resistant castable refractory.This material adopts the method for pouring construction, can be widely used in easy to wear, the infiltration and the attack sites of Thermal Equipments such as blast furnace, hotblast stove, circulating fluidized bed, incinerator, catalytic cracking unit.

Technical background

Easy to wear, the infiltration of Thermal Equipments such as blast furnace, hotblast stove, circulating fluidized bed, incinerator, catalytic cracking unit and attack sites, it is the key position of high temperature service, directly influence the work-ing life of high temperature furnace lining and the utilising efficiency of high temperature service, in the refractory raw material, corundum has high-melting-point and high-intensity characteristics, mullite and ZrO ₂Material has the characteristic of good thermal shock stability, simultaneously, and Cr ₂O ₃And ZrO ₂Deng refractory raw material is again impermeabilisation and erosion-resistant optimum feed stock, therefore, and corundum-mullite-Cr ₂O ₃-ZrO ₂Based material is the ideal abrasion-proof and refractory pouring material.

Traditional corundum-mullite-Cr ₂O ₃-ZrO ₂Be that the abrasion-proof and refractory pouring material aggregate is mainly with two kinds of forms, a kind of is directly to adopt corundum and the compound second wife of mullite raw material to use, a kind of natural matter that is to use mineral facies by the sintering bauxite clinker of corundum and mullite phase composite, its proportioning raw materials is: corundum-mullite or sintered bauxite raw material (8～5mm) 5～15%, (5～3mm) 5～15%, (3～1mm) 10%～20%, (1mm＞) 10%～25%, the fine powder 5～15% of (0.088mm＞), alumina powder 1～10%, fine silica powder 1～6%, pure calcium aluminate cement 1～8%, chromium sesquioxide 1～5%, zirconium white 1～5%, all the other admixtures 0.2～0.5%.Volume density 2.8g/cm ³, thermal conductivity 1.5W.m ^-1.K ^-1But, when directly adopting corundum and the compound second wife of mullite raw material to use and since corundum and mullite all be high temperature mutually, when easy-sintering not, middle low temperature, bonding strength is low, wear resisting property is bad.And traditional bauxite chamotte, difference along with the place of production, raw material is formed different, especially dopant species and content difference are bigger, and, be subjected to the influence of traditional firing process and artificial selection technology, it is stable inadequately that bauxite chamotte has quality, process meticulous inadequately, characteristics such as lack of homogeneity, this has had a strong impact on the stability of abrasion-proof and refractory pouring material performance index and the homogeneity of damage speed, especially concentrates or low-grade sintering bauxite clinker when sneaking at impurity, the concentrated wear of high temperature furnace lining can appear, the infiltration and corrode problems such as too fast, seriously reduced the work-ing life of high-abrasive material and the utilization coefficient of high temperature kiln.

Homogeneous class material be to existing alumina natural matter by homogenizing process and suitably high-temperature calcination, thereby reach the stable, evenly of structure, performance and quality, the phenomenon of avoiding impurity to concentrate.The homogeneous material of alumine base, be mainly salic 50%～70% serial homogenized alumina grog (trade mark is Mulcoa) of the U.S. abroad, be C.E. company the Georgia state utilize local and near alumine, through the wet method extrusion molding, make in the rotary kiln high-temperature calcination, Britain's trade mark is the homogeneous material (Al of Molochite ₂O ₃Content is 42%～44%) be to utilize local kaolin, rinsing, purify the back pressed compact and burn till at tunnel furnace.In middle nineteen nineties, U.S. C.E. company founds the factory in Guizhou, utilizes local resources to produce high-purity homogenized alumina grog, Al ₂O ₃(trade mark is α-Star) to content 90%～93%.China according to the aluminium content and the impurity characteristics of China's alumina, carried out the research and development of alumine homogenization material in " eight or five " tackling key problem, developed Al gradually ₂O ₃Content is 70%～90% homogeneous material, and volume density is 2.9～3.5gcm ^-3The synthetic homogeneous material has characteristics such as low porosity, low water absorption, volume density height and high uniformity.

Application about homogeneous material launches gradually, and adopts Al ₂O ₃Content is 70%～90% alternative conventional sintering bauxite clinker of homogeneous material or corundum-mullite mixing raw material, and the report of the abrasion-proof and refractory pouring material of combined oxidation chromium and zirconium white exploitation low porosity, low water absorption and high stability is less.

Summary of the invention

Purpose of the present invention adopts synthetic high alumina homogeneous material to substitute conventional sintering bauxite clinker and corundum-mullite mixing raw material, in conjunction with the abrasion-proof and refractory pouring material of chromic oxide and zirconium white exploitation low porosity, low water absorption and high stability.

A kind of high alumina homogeneous material-chromic oxide-zirconium white is a wear-resistant castable, the present invention is by following proportioning, the various refractory raw materials of weighing, after forced stirrer stirs the water yield of 4.5～6.5% mass percents (and add), mixed mould material is molded into wear-resisting test samples and intensity detection sample etc., sample after the demoulding in 24 hours in particular mold, after 110 ℃ of oven dry in 24 hours, 1100 ℃ of thermal treatments 3 hours, behind the naturally cooling, the measurement performance index.

Refractory raw material granularity (mm) mass content (%)

High alumina homogeneous material 8-5 5～15

5-3 5～15

3-1 10～20

1-0 5～25

＜0.074 5～15

Silicon powder 95 1～8

Alumina powder 1～10

Pure calcium aluminate cement 1～10

Chromium dioxide 1～5%

Zirconium white 1～5%

Polycarboxylate dispersant's (adding) 0.2～0.5.

Wherein the high alumina homogeneous material is: Al ₂O ₃Content is 70～90%, and volume density is 2.9～3.5gcm ^-3

Al ₂O ₃Content is that 70%～90% the homogeneous material and the essential mineral of sintering high grade bauxite grog are corundum, mullite mutually, corundum is combined closely mutually with mullite, the problem of the hard-to-sinter that has existed when having solved with corundum raw material and the compound use of mullite raw material, and, the sintered bauxite grog raw material of high porosity, lack of homogeneity is compared, use homogeneous material can guarantee the uniformity of construction body, and can realize low wash water, high fatefulue high-grade refractory materials.In addition, along with the maturation gradually of synthesis technique, cost reduces greatly, has been lower than the price of traditional superfine sintering bauxite clinker at present, and product price far below the refractory materials with corundum and two kinds of development of raw materials of mullite, has vast market prospect especially.

Advantage of the present invention is to adopt the synthetic high alumina homogeneous material of low water absorption, low porosity and high uniformity to substitute the sintering bauxite clinker of traditional high water absorbing capacity, high porosity and lack of homogeneity or the compound system of corundum and mullite, and having developed homogeneous material-chromic oxide-zirconium white is high wear resistant castable refractory.This material can be widely used in easy to wear, the infiltration and the attack sites of Thermal Equipments such as blast furnace, hotblast stove, circulating fluidized bed, incinerator, catalytic cracking unit.

Embodiment:

Example sees Table 1.

Table 1 embodiments of the invention

On probation through the scene, the present invention adopts the synthetic high alumina homogeneous material of low water absorption, low porosity and high uniformity to substitute the sintering bauxite clinker of traditional high water absorbing capacity, high porosity and lack of homogeneity or the mixing raw material of corundum and mullite, developing high alumina homogeneous material-chromic oxide-zirconium white is high wear resistant castable refractory, not only have good workability, intensity height, wear resistance be good, and on-the-spot result of use the best, this helps prolonging the work-ing life of furnace lining, improve the utilising efficiency of high temperature kiln, have vast market prospect.

Claims

1. high alumina homogeneous material-chromic oxide-zirconium white is a wear-resistant castable, it is characterized in that it being by following proportioning, the various refractory raw materials of weighing after forced stirrer stirs, and add the water yield of 4.5～6.5% mass percents, mixed mould material is molded into wear-resisting test samples and intensity detection sample in particular mold, sample after the demoulding in 24 hours is after 110 ℃ of oven dry in 24 hours, respectively 1100 ℃ of thermal treatments 3 hours, behind the naturally cooling, the measurement performance index;