尖晶石明悦窑炉耐火材料尖晶石 铝镁尖晶石高温力学性能稳定

尖晶石简介

      尖晶石是一族矿物，在自然界中形成于熔融的岩浆侵入到不纯的灰岩或白云岩中经接触变质作用形成的。有些出现在富铝的基性岩浆岩中。颜色、透明度、重量是尖晶石的评价与选购的依据。尖晶石有各种颜色，通常含有较多的包裹体，呈成层分布，透明度较好。红色尖晶石受人欢迎，鲜红色，透明度高，重量大的是其佳品。有星光效应的尖晶石也较贵重。深红、大红、艳蓝、绿的尖晶石也较好。

      明悦尖晶石是自然界中少有的一种矿物质，必须靠人工合成才能制的。将原料按一定比例配比，混炼压球成型（加入适量纸浆）。经特质电熔炉高温熔炼，在熔炼过程中，保持微还原状态，防止FeO氧化成Fe2O3,防止出现单质Fe，经自然冷却后而制得的铁铝尖晶石砂。其在显微镜下显示无晶界得均匀大晶体（占95），类似玻璃态物质。加工成铁铝尖晶石砖后，主要应用于大型水泥回转窑，替代目前水泥窑使用的铬砖，无Cr6+污染。延长了炉衬砖使用寿命（镁铬砖10-12个月，铁铝尖晶石砖17-18个月），大大降低了耐火材料人力物力的消耗，减少了生产成本，完全实现了水泥窑无铬化生产，解决了铬污染公害。铁铝尖晶石代表了水泥回转窑新一代高性能无铬耐火材料。

      氧化镁与氧化铝在1700度以上会反应生成镁铝尖晶石。尖晶石的两个主要生产方法是烧结法和电熔法。多数尖晶石材料是由高纯合成氧化铝和化学级氧化镁制成，即在竖窑烧结和在电弧炉内电熔。

Spinel is gens minerals, formed from molten magma intrusion in nature to the impure limestone or dolomite formed regularly contact metamorphism. Some appear in rich aluminium basic magmatic rocks. Color, transparency, weight is the basis of assessment and the choose and buy of spinel. Spinel has all sorts of color, usually contains more inclusions, distributed in layers, good transparency. Red spinel is the most popular, bright red, high transparency, weight is the best. Starlight effects of spinel also relatively expensive. Deep red, bright red, brilliant blue and green spinel is better also.

Spinel is rare in nature a kind of mineral, must rely on synthetic ability system. The ratio of raw materials according to certain proportion, mixing pressure forming, adding suitable amount of pulp). By the high temperature electric furnace smelting, in the process of smelting, maintain state of micro reduction, prevent into Fe2O3 FeO oxidation, prevent elemental Fe, after natural cooling hercynite made by sand. It under the microscope shows no uneven big crystal grain boundary (95), similar to the glassy state. After processing to iron aluminum spinel brick, is mainly used in large-scale cement rotary kiln, instead of the chrome brick, cement kiln is used currently no Cr6, + pollution. Prolong the service life of furnace lining brick, magnesite chrome brick, 10-12 months hercynite spinel brick 17-18 months), greatly reduces the consumption of refractory material resources, reduce the production cost, fully implement the cement kiln without chromium production, solves the chromium pollution. Hercynite represents a new generation of high performance cement rotary kiln without chrome refractory materials.

尖晶石特性

      明悦铝镁尖晶石属于一种铝镁氧化物，其主要成分为氧化铝和氧化镁。铝镁尖晶石有天然形成和人工合成两种。天然镁砂尖晶石极少发现，工业上应用的铝镁尖晶石全部都是人工合成的，合成铝镁尖晶石的两个主要方法是烧结法和电熔法。多数尖晶石材料是由高纯合成氧化铝和化学级氧化镁制成，即在竖窑烧结和在电弧炉内电熔。

      烧结尖晶石工艺是一个连续的陶瓷化过程，控制窑中给料速度和均衡的温度分布，产生非常均匀的晶体尺寸为30-80μm及低气孔率(<3％)的产品。烧结铝镁尖晶石具有良好的抗侵蚀、抗腐蚀、抗剥落能力强，抗渣性能好，抗磨蚀能力强，热稳定性好，耐高温等特点。电熔尖晶石具有耐高温、体密大、吸水率低、热膨胀系数小、热稳定性好、抗侵蚀能力强的特点。

Magnesium aluminum spinel belongs to a kind of aluminum and magnesium oxide, the main components in aluminum oxide and magnesium oxide. Magnesium aluminum spinel has two kinds of natural formation and synthetic. Natural magnesia spinel, rarely found in industry application of magnesium aluminum spinel all of them are synthetic, two main method of synthesis of magnesium aluminium spinel is a fused method and sintering process. Most spinel material is made from high purity synthetic chemical and alumina grade magnesium oxide, which in shaft kiln sintering and fused in arc furnace.

Sintered spinel process is a continuous process of pottery and porcelain, control the temperature of the furnace feeding speed and the equilibrium distribution, have very uniform crystal size of 30-80 microns and low porosity (< 3) of the product. Sintered alumina magnesia spinel has good erosion resistance, corrosion resistance, spalling resistance capability is strong, good slag resistance, strong abrasion resistance, good thermal stability, high temperature resistant characteristics. Fused spinel has the secret of high temperature resistant, body, bibulous rate is low, small thermal expansion coefficient, good thermal stability, strong ability to resist erosion characteristics.

尖晶石用途

      电熔镁尖晶石是一种碱性耐火材料，电熔镁铝尖晶石产品是以纯度98.5的工业氧化铝和纯度96的轻烧镁并配入适量的高纯度菱镁矿（Mg＞47）做配合料，在电弧炉内经高温熔制合成的耐火原料。电熔镁铝尖晶石是制造连铸滑板，水口砖、钢包衬砖的理想原料，另外产品也是主要用于大型水泥回砖窑过渡带衬砖、耐火浇注料及高、中窑具用的基本原料，镁铝尖晶石制品的高温力学性能稳定。

      烧结铝镁尖晶石用于水泥回转窑，不但避免了铬公害，而且具有良好的抗剥落性。烧结铝镁尖晶石用于制作钢包浇注料，大大提高钢板衬的抗侵蚀能力，使烧结铝镁尖晶石广泛应用于炼钢用耐火材料。优质预合成尖晶石的制取为不定形及定形高纯耐火材料的生产提供了新的原料。

Fused magnesia spinel is a kind of basic refractory, fused magnesium aluminate spinel product with a purity of 98.5 or more industrial alumina and a purity of 96 or more light burning magnesium and distribution into the right amount of high purity magnesite (> 47) Mg do batch, Canon of high temperature melt in arc furnace refractory raw material synthesis. Fused magnesium aluminate spinel is making continuous casting skateboards, nozzle bricks, ladle lining brick of ideal raw materials, and products are mainly used for large cement kiln back transitional zone lining brick, refractory kiln furniture in pouring and high, the basic raw material, high temperature mechanical properties of magnesium aluminium spinel products stability.

Sintering alumina magnesia spinel is used for cement rotary kiln, not only avoid the chromium pollution, but also has good resistance to spalling. Sintered alumina magnesia spinel used in ladle castable, greatly improve the erosion resistance of steel lining, the sintering alumina magnesia spinel refractory material is widely used in steelmaking. High quality of preparing for amorphous synthetic spinel and setting high purity of refractory production provides a new raw material.

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