The present invention relates to the working method of the used spinel brick of manufacture of cement kiln, especially relate to the working method of the magnesia chrome spinel brick that uses at a kind of dry-process cement rotary kiln transitional zone place.
Large-scale dry-process cement rotary kiln transitional zone is owing to be in thermal technology's unsteady state; Kliner coating frequently replaces, and can not stick solid thick kliner coating, becomes the weak link of new type dry kiln; Spinel brick is because good thermal shock stability, can hang up thin and stable kliner coating and favored.But; Common spinel brick is because the restriction of factors such as raw materials for production, production technique, production unit and production technology; Work-ing life of cement rotary kiln transition belt generally all at 3-4 month; Maximum duration is no more than 6 months, and transitional zone kiln lining 1 year needs to change several times, and this problem is trusted subordinate's pain of cement production enterprise always.
Summary of the invention
The object of the present invention is to provide to prolong the working method of one times Mg-Al spinel brick a kind of work-ing life.
For realizing above-mentioned purpose, the present invention can take following technical proposals:
The working method of Mg-Al spinel brick of the present invention, it comprises the steps:
The first step: take by weighing 3 parts in the magnesia material of granularity 5-3mm by weight, 2.5 parts in the magnesia material of 0.075mm＜granularity＜3mm, 3.5 parts of the magnesia powders of granularity≤0.075mm; 1 part of the spinel material of granularity 5-3mm, 1 part of the spinel material of granularity＜3mm;
Second step: above-mentioned mixing of materials evenly is placed in the edge runner-wet mill, and the lignin liquor that adds total weight of material 4-5% is wet to be ground after 15-25 minute, placed pressure greater than moulding in the pressing machine of 630KN, processed work in-process;
The 3rd goes on foot: work in-process are placed carry out drying in the moisture eliminator, drying temperature 95-105 ℃, be no less than 24 hours time of drying; Dried goods get in the tunnel, sintering under 1730 ℃ of oxidizing atmosphere conditions, and insulation obtained the finished bricks body in 10-12 hour under 1730 ℃ ± 10 ℃ conditions, the physical and chemical index of finished bricks body is MgO (%)>=85, Al 2O 3(%)>=and 12-14, SiO 2(%)≤0.8, volume density (g/cm 3)>=2.95, cold crushing strength (MPa)>=60, refractoriness under load ℃ (0.2MPa, T0.6)>=1700, thermal shock resistance, inferior (1100 ℃, water-cooled)>=12.
Said magnesia is highly-purity magnesite or electrosmelted magnesite clinker, and its standard content is MgO>=97%, CaO＜0.8%, SiO 2≤0.6%, Fe 2O 3≤0.7%.
The standard content of said spinel material is MgO>=32%, CaO≤0.5%, SiO 2≤0.3%, Al 2O 3>=66%, Fe 2O 3≤0.5%.
The invention has the advantages that when the Mg-Al spinel brick that adopts this method preparation uses in new type nonaqueous cement kiln transitional zone second gear wheel zone; Can reach work-ing life more than 1 year; Can keep synchronous operation with the clinkering zone kiln lining, reduce and stopped the kiln frequency of maintenance, (to produce 5000 tons of cement Dayaos daily is example for the user has created good economic benefit; Whenever stop the kiln maintenance less once, promptly can be user's economic benefits that increase by 1,200,000 yuan more).This product has advantages such as erosion-resisting characteristics is good, anti-thermal shock good stability.Compare its thermal shock resistance (1100 ℃, water-cooled) number of times than like product and double abovely than common spinel brick, magnesia brick and Magnesia alumina brick, refractoriness under load is than the high 50-100 of common spinel brick, magnesia brick and magnesia alumina brick ℃.
The life cycle of this product on the new type nonaqueous cement kiln of daily output 5000T/D cement clinker can reach more than 12 months; Be 2 times with the common spinel brick cycle; The new Cement Group company of China Yangxin second phase 6000T/D Dayao clinkering zone has been created 456 days the longest life cycle record in the whole nation with this product, well beyond similar dry-process cement rotary kiln with 6 months average life cycle of spinel brick.Contrast between this product physical and chemical index and Mz-97 magnesia brick and the ML-80A magnesia alumina brick physical and chemical index sees the following form:
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