耐火溫度2000℃以上（℃）規(guī)格0--9 按要求生產(chǎn)（mm）產(chǎn)地河南品牌紅育 9產(chǎn)品類別窯爐工業(yè)窯爐用保溫材料材質(zhì)EPS導(dǎo)熱系數(shù)（常溫）0.056等級(jí)1級(jí)低溫彎折≤11斷裂伸長率0.3抗彎強(qiáng)度12抗壓強(qiáng)度12拉伸強(qiáng)度13使用溫度600撕裂強(qiáng)度55芯材hdf形態(tài)層狀形狀表面凹凸型

尖晶石

【概述】

　　尖晶石是鎂鋁氧化物組成的礦物，因?yàn)楹墟V、鐵、鋅、錳等等元素，它們可分為很多種，如鋁尖晶石、鐵尖晶石、鋅尖晶石、錳尖晶石、鉻尖晶石等。由于含有不同的元素，不同的尖晶石可以有不同的顏色，如鎂尖晶石在紅、藍(lán)、綠、褐或無色之間；鋅尖晶石則為暗綠色；鐵尖晶石為黑色等等。尖晶石呈堅(jiān)硬的玻璃狀八面體或顆粒和塊體。它們出現(xiàn)在火成巖、花崗偉晶巖和變質(zhì)石灰?guī)r中。有些透明且顏色漂亮的尖晶石可作為寶石，有些作為含鐵的磁性材料。用人工的方法已經(jīng)可以造出200多個(gè)尖晶石品種。

尖晶石是一族礦物，在自然界中形成于熔融的巖漿侵入到不純的灰?guī)r或白云巖中經(jīng)接觸變質(zhì)作用形成的。有些出現(xiàn)在富鋁的基性巖漿巖中。寶石級(jí)尖晶石則主要是指鎂鋁尖晶石，是一種鎂鋁氧化物。晶體形態(tài)為八面體及八面體與菱形十二面體的聚形。顏色豐富多彩，有無色、粉紅色、紅色、紫紅色、淺紫色、藍(lán)紫色、藍(lán)色、黃色、褐色等。尖晶石的品種是依據(jù)顏色而劃分的，有紅、橘紅、藍(lán)紫、藍(lán)色尖晶石等。玻璃光澤，透明。貝殼狀斷口。淡紅色和紅色尖晶石在長、短波紫外光下發(fā)紅色熒光。

【物理性質(zhì)】

　　尖晶石（spinel）

　　化學(xué)分子式為mgal2o4

　　晶系：屬等軸晶系

　　結(jié)晶習(xí)性：常呈八面體晶形，有時(shí)八面體與菱形十二面體、立方體成聚形。

　　光澤：玻璃光澤至亞金剛光澤

　　透明度：透明至不透明

　　折光率：1.718，因含微量元素不同而改變Zui高可至2.000.無雙折射

　　無多色性

　　特殊光學(xué)效應(yīng)：星光效應(yīng)（四射或六射），變色效應(yīng)。比較稀少

　　硬度：8

密度：3.60（+0.10，-0.03）克/立方厘米

項(xiàng)目

al2o3

mgo％

sio2%

體密g/cm3

氣孔率%

尖晶石%

硅酸鹽%

指標(biāo)

56-62

28-32

<4.0

<3.0

<9.0

85-90

10

【產(chǎn)狀與組合】

　　常產(chǎn)于鎂質(zhì)灰?guī)r與花崗巖類的接觸變質(zhì)帶，與鎂橄欖石、透輝石等共生?；詭r、超基性巖中的尖晶石，由巖漿直接結(jié)晶形成，與輝石、橄欖石、磁鐵礦、鉻鐵礦及鉑族礦物等伴生。在富鋁貧硅的泥質(zhì)巖石的熱變質(zhì)帶亦可形成尖晶石，常與堇青石或斜方輝石共生。

【鑒定特征】

　　八面體形態(tài)、硬度大、尖晶石律雙晶為特征。相似礦物鋯石密度較大，一軸晶；剛玉硬度更大；石榴子石硬度小于尖晶石。

【工業(yè)應(yīng)用】

鎂尖晶石是鎂質(zhì)耐火材料的主要結(jié)合相，也是尖晶石質(zhì)耐火材料的主要物相。透明無暇、色澤美觀者可作寶石。

尖晶石耐高溫、熱膨脹系數(shù)小、熱穩(wěn)定性好、抗渣性強(qiáng)，廣泛用于鋼鐵冶煉，水泥回轉(zhuǎn)窯及玻璃工業(yè)窯爐上

【overview】

spinel is a mineral composed of mg-al oxides, as containingmagnesium, iron, zinc, manganese, etc. elements, they can bedivided into many forms, such as aluminum spinel, iron spinel, zincspinel, manganese spinel, chrome spinel and so on. due to thedifferent elements, different spinel can have different colors, forexample, magnesium spinel is between the red, blue, green, brown,and the colorless; zinc spinel is dark green and iron spinel isblack, etc. spinel shows a hard glassy octahedral, granular andblock. they can be founded in the igneous rock, granitic pegmatiteand metamorphic limestone. some transparent and beautiful spinelcan be used as precious stones and some used as an iron-containingmagnetic material. now people have could produce more than 200varieties of spinel.

spinel is a family mineral, formed by contact metamorphism inthe molten magma when this magma intrusting into the impurelimestone or dolomite. some appear in the al-rich basite magmaticrocks. gem- spinel mainly refers to mg-al spinel, an mg-aloxide. its form is the octahedron and the aggregation of octahedronand rhombic dodecahedron. they have varied colors, colorless, pink,red, purple, light purple, deep blue, blue, yellow, and brown andso on. spinel is divided by its color variety; there is red,orange, blue-violet, blue spinel and so on. pink and red spinelaglow red fluorescence when in the long and short-wave uv-wave.

【physical properties】

spinel

chemical formula: mgal2o4

crystal system: isometric system

crystal features: octahedral crystal form, the aggregation ofoctahedron and rhombic dodecahedron

luster: vitreous luster and sub-adamantine luster

transparency: transparent and opaque

refractive index: 1.718, it changes according to the content oftrace elements; maximum is 2.000; no birefringence; nopolychroism

special optical effects: star effect, aventurescence andrarity

hardness: 8

density: 3.60 (+0.10, -0.03) g / cm3

item

al2o3

mgo%

sio2%

bodydensity

g/cm3

porosity%

spinel%

silicate%

indicators

56-62

28-32

<4.0

<3.0

<9.0

85-90

10

【product and combination】

it usually originates in the metamorphic belt of magnesianlimestone and granite and intergrowth with magnesium olivine anddiopside. the spinel in the basite and ultrabasic rocks is directlycrystallized by magma, associated with pyroxene, olivine,magnetite, chromite and platinum group minerals and so on.

【features identification】

octahedral shape; hardness; great corundum hardness; harder thangarnet

【industrial applications】

widely used in iron and steel smelting, cement rotary kiln andglass industry furnaces