CN1151389A - Oxydation process and tech. for making casted Zr corindon bricks - Google Patents

Abstract

A new oxidation process for casting zirconium-corundum brick features three charging positions for electric furnace, two-pass oxidizing, the combination of splice and integral installation in making mould, and newly designed high-precision pre-assembly platform of 150 sq.m for cold processing system. It can pre-assembly parts or whole zirconium-corundum brick used for smelters of glass.

Description

The novel oxidation style Technology of fused cast zirconia-alumina brick

The present invention relates to a kind of improvement of fused cast zirconia-alumina brick production method.Present technique is to belong to the castable refractory field.Product is mainly used in various glass melters.

The oxidation style fused cast zirconia-alumina brick is to be main raw material with zircon and commercial alumina powder, after weighing batching, electric furnace oxidation fusion, cast molding, cooling annealing and cold working, a kind of high-quality castable refractory that makes, it is few that it has impurity, compact structure, characteristics such as glassy phase oozes out the temperature height, and erosion performance of anti-glass metal the and high temperature resistant property are strong.It is widely used at the bottom of the pool wall, pond of glass melter and flame space focus place.

Fused cast zirconia-alumina brick domestic production technology is as follows substantially at present:

1. batching preparation: domestic production factory all selects general feedstock production for use, and Shenyang Refractory Material Factory (being called for short Shen Naichang) all selects high pure raw material for use with external a few family factory, and introduces the part desilicated zirconia and prepare admixtion, to guarantee the ZrO of goods ₂And Al ₂O ₃Deng the content of major ingredient, also Fe has been controlled in strictness ₂O ₃And TiO ₂Deng impurity composition.

2. smelting process: factory all adopts long arc to add auxiliary oxygen blast technology both at home and abroad, is hollow graphite electrode plasma long arc oxidation fusion technology and the anti-factory in Shen adopts.Two kinds of method purposes all are to eliminate in the goods carbon content and some iron, titanium lower valency ion are converted into high valence state ion, make the glassy phase of goods ooze out temperature and reach more than 1400 ℃, and the bubble eduction rate is controlled at below 5%.The original problem technology of the anti-factory in Shen is still unstable, thus the high-quality brick also to be introduced be main.

3. the mold making technology of the usefulness of casting: the assembly unit mould making process of domestic most employing baking sodium silicate sand template, adopt resin sand unit sand mould moulding process abroad.

4. annealing process: all adopt silicon sand both at home and abroad, carry out spontaneous combustion, cooling annealing as goods annealed thermal insulation medium to stone flour and diatomite.

5. cold processing technique: all adopt diamond rattler abrasive article both at home and abroad.

The object of the invention: stabilization process, improve product, quality and cost rate, to satisfy glass melter to maximization, high melting rate, low consumption and the development in age of long kiln.

Content of the present invention is to improve the coupling of electric smelting technology and whole processing line emphatically, its feature:

(1) in the electric furnace feeding system, increased a new feeding point, generally all be that left and right two places feed intake both at home and abroad, the anti-factory in Shen adopts uniform three places to feed intake, so that admixtion more all is distributed into stove, improves the homogeneity of the Chemical Composition of melt and goods;

(2) in electric furnace system, set up a cover oxygen blowing device, make and throw furnace charge earlier behind hollow graphite electrode plasma long arc oxidation fusion, again through the oxygen blowing device oxygen blast; This oxygen blowing device adopts hydrostatic transmission, automatic lifting, and swing oxygen rifle is to the interior oxygen blast of stove, and therefore, the carbon content of goods drops to minimum level, and glassy phase oozes out performance such as temperature and is improved largely, and has reached the quality level of international like product;

(3) in the molding system, set up a jumbo sand mold baking far infrared rays resistance furnace and a self-hardening sand mixing machine, the throughput of pattern making procedure is doubled, be complementary with electric furnace cast ability basically, guarantee the continuous production demand of electric furnace, also improved yield rate.While combines the assembly unit mould making process of baking sodium silicate sand template with the molded mold technique of unit sand, thereby has improved the molding ability and the level of all kinds of bricks, and the visual appearance of goods also is improved and improves;

(4) newly gone up a pre-assigned line of cold working, this line has two diamond brick cutting machines, nine diamond rattlers, the pre-assembly platform of high precision that a diamond boring machine and new design are 150 square metres is combined, this line can carry out surface grinding and boring to all kinds of specification brick materials, and can carry out the pre-assembling of local and whole kiln to the fused cast zirconia-alumina brick that all kinds of glass melters such as large-scale float glass smelting kiln are used, the pre-assembling ability and the level of this line are reached advanced world standards.

Advantage of the present invention and effect:

1. technology advanced person, the level of automation height, easy to operate;

2. improved the quality of product, its physics and chemical property all reach and are above standard and requirement, and its physicochemical property is as follows:

AZS Chemical Composition (%):

SiO ₂Al ₂O ₃ZrO ₂Na ₂O Fe ₂O ₃TiO ₂33 ^#Brick 15.96 49.63 32.34 1.39 0.10 0.1141 ^#Brick 12.95 44.48 40.53 1.25 0.11 0.11 physicalies: 33 ^#Brick 41 ^#Brick apparent porosity (%) 11 volume density (g/cm ³) 3.76 3.93 glassy phase primary temperatures (℃) 〉=1400 〉=1420 bubble eduction rates (%) 10

Unit weight (g/cm ³):

PT ≥3.4 ≥3.55

QX ≥3.45 /

MS ≥3.5 /

WS ≥3.7 ≥3.9

3. quality product has reached the advanced level of international like product, can provide No. 33, thousands of tons of quality oxide method founding and No. 41 zircon corundum bricks every year to glass industry, basically satisfied the technical progress requirement of float glass smelting kiln and other glass melter, and introduce this series products thousands of tons of every year less, for country saves about 4,500,000 dollars of foreign exchange.

Embodiment:

The present invention practiced at Shen Naichang in April, 94.Ton high-quality fused cast zirconia-alumina brick surplus having produced 1000, and be applied to the producers such as magnificent glasswork, Yaohua Glass Works of Qinhuangdao City, Luoyang Glass Works of shaking of Kunming sheet glass factory, Sichuan glass limited-liability company, Henan.For country saves 2,000,000 dollars of foreign exchanges.

Claims (1)

1. novel oxidation style Technology of fused cast zirconia-alumina brick is characterized in that:

(1) the electric furnace feeding point is at uniform 3 and feeds intake;

(2) the throwing furnace charge of electric furnace is earlier behind hollow graphite electrode plasma long arc oxidation fusion, again through the oxygen blowing device oxygen blast;

Used oxygen blowing device adopts hydrostatic transmission, automatic lifting, and swing oxygen rifle is to the interior oxygen blast of stove;

(3) molding system adopts sand mold baking far infrared rays resistance furnace and self-hardening sand mixing machine, and the assembly unit mould making process of baking sodium silicate sand template is combined with the molded mold technique of unit sand;

(4) the pre-assigned line of cold working is combined diamond brick cutting machine, rattler, drilling machine and 150 square metres of pre-assembly platforms of high precision, can assemble part and whole kiln fused cast zirconia-alumina brick that all kinds of glass melters are used in advance.