產(chǎn)品詳情
鋁礬土簡(jiǎn)介：
鋁礬土（aluminous soil；bauxite）又稱礬土或鋁土礦，主要成分是氧化鋁，系含有雜質(zhì)的水合氧化鋁，是一種土狀礦物。白色或灰白色，因含鐵而呈褐黃或淺紅色。密度3.9～4g/cm3，硬度1～3，不透明，質(zhì)脆。極難熔化。不溶于水，能溶于硫酸、氫氧化鈉溶液。主要用于煉鋁，制耐火材料。
耐火材料行業(yè)所稱的鋁礬土通常是指煅燒后Al2O3>=48%、而含F(xiàn)e2O3較低的鋁土礦，高鋁礬土熟料是經(jīng)過(guò)煅燒的鋁礬土礦。熟料為灰白淺黃及深灰色，它主要用于高鋁質(zhì)耐火材料，也可用來(lái)制作電熔棕剛玉。
鋁礬土劃分級(jí)別的標(biāo)準(zhǔn)：
高鋁礬土熟料是按AL2O3含量及Fe2O3、TiO2、Ca O+ Mg O、K2O+Na2O等雜質(zhì)含量和熟料體積密度與吸水等項(xiàng)指標(biāo)來(lái)分級(jí)的。
鋁礬土的種類、級(jí)別：
(1)生礬土，即礬土原礦石(天然沉積巖類)。
(2)熟礬土，將生礬土經(jīng)高溫煅燒后(1200～1700℃)稱為熟礬土。
鋁礬土煅燒后，其物化性能變化如下：
1、外觀由原來(lái)的灰、深灰、灰黃、灰白、紅黃等顏色，轉(zhuǎn)變?yōu)榘咨?、米黃色、棕紅色、藍(lán)色，而藍(lán)色隨著含鋁量增高而加深。原來(lái)的土狀光澤變?yōu)閯傆窆鉂苫蛴椭鉂桑袝r(shí)表面出現(xiàn) 輕微的熔化石或裂縫；
2、氧化鋁含量增加11～13%,其他雜質(zhì)增加量微；
3、體積縮小23%左右；
4、燒失量為14.5%左右；
5、由一水型鋁石或一水鋁—高嶺石型，轉(zhuǎn)變?yōu)槿嗽靹傆瘛⒛獊?lái)石及少量玻璃相；
6、硬度由原來(lái)的1～3增加到8以上；
7、體積密度由原來(lái)的2.5g/cm3左右增加至2.8～3g/cm3以上；
8、結(jié)晶水、結(jié)構(gòu)水、附著水全部溢出；
9、結(jié)構(gòu)上由疏、松、軟變?yōu)橹旅軋?jiān)硬；
10、吸水性降低；抗渣性、抗堿性增強(qiáng)；
12.強(qiáng)度增加；
13.滲透性減少；
14.氣化率減少；
15.易揮發(fā)成分、易燃燒成分、土氣味完全消失；
16. 耐火度達(dá)到1780℃以上。
(3)熟礬土按煅燒窯爐不同分為：
①豎爐熟礬土(SHAFT KILN BAUXITE)；②轉(zhuǎn)爐熟礬土(ROTARY KILN BAUXITE)；③倒焰窯礬土(ROUND KILN BAUXITE)。
(4)熟礬土按不同用途分為：
①耐火級(jí)礬土；②研磨級(jí)礬土；③電焊級(jí)礬土。
鋁礬土檢驗(yàn)指標(biāo)：
(1)高鋁礬土(含Al2O385%以上)要求檢驗(yàn)項(xiàng)目：
Al2O3：耐火級(jí)85～87%以上，研磨級(jí)86%以上，電焊級(jí)87%以上；SiO2：耐火級(jí)6～7% 以下，研磨級(jí)5～6%以下；Fe2O3：耐火級(jí)1.6～2%以下，耐磨級(jí)2%以下；TiO2:耐火級(jí)3.5～4%以下，研磨級(jí)4～4.5%以下；K2O+Na2O+CaO+MgO：耐火級(jí)0.5～1%以下，研磨級(jí)0.5～1%以下。電焊級(jí)礬土有的還要求檢驗(yàn)磷、硫、錳等項(xiàng)目。
B.D.(體積密度)：耐火級(jí)3.10～3.20g/cm3以上，研磨級(jí)、電焊級(jí)不要求檢驗(yàn)該項(xiàng)目。
L.O.I(燒失量)：均為0.3%以下。
粒度：按買方要求制定，一般有自然塊、100mm、50mm、25mm、10mm、5mm、3mm、1mm等。
水份：一般0.5～1.5%之間，超過(guò)扣重或其它條款。
(2)一般礬土(含Al2O380%以上)要求檢驗(yàn)項(xiàng)目：
耐火級(jí)：不小于Al2O3:80%；Fe2O3:不大于2%；B.D:不小于2.8g/cm3；粒度及水份按買方要求制定。
另外，還有將合同中粒度簽定為細(xì)粉的，一般要求在100～200目之間，通過(guò)率85～90%以上 。
(3)鐵礬土要求檢驗(yàn)項(xiàng)目：
Al2O3:不小于80%；Fe2O3:4～10%；TiO2:不大于4%；SiO2:不大于7%，粒度：按買方要求制定。
(4)生礬土要求檢驗(yàn)項(xiàng)目：
Al2O3:70～73%；Fe2O3:1.5%左右；TiO2:不大于4%；SiO2:不大于6%；燒失量 :14～15%；K2O+Na2O+CaO+MgO=0.5～1%。
Bauxite introduction:
Bauxite (aluminous soil; bauxite) also called alumina or bauxite, the main component is alumina, system contains impurities hydrated alumina, it is a kind of earthy mineral. White or grey, for iron and a brown yellow or light red. Density 3.9 ~ 4 g/cm3, hardness 1 ~ 3, not transparent, is very brittle. Very difficult to melt. Insoluble in water, soluble in sulfuric acid, sodium hydroxide solution. Mainly used for aluminum smelting, system refractory material.
Refractory industry "bauxite is usually refers to after calcination Al2O3 > = 48%, and contain Fe2O3 lower bauxite, high bauxite cber is after calcined bauxite ore. Cber for yellow grey and dark grey, it is mainly used for high aluminum refractory material, can also be used to make fused corundum.
Bauxite division level standard:
High bauxite cber is to press AL2O3 content and Fe2O3, TiO2, Ca O + Mg O, K2O + Na2O impurity content and cber volume density and water absorption and indicators to the classification.
Bauxite types, level:
(1) raw bauxite, namely alumina raw ore (natural sedimentary rock class).
(2) the calcined bauxite, will be born by the high temperature calcined alumina after (1200 ~ 1700 ℃) called calcined bauxite.
After calcined bauxite, its physicochemical properties change as follows:
1, appearance of the original grey, dark gray, gray, red, with the color such as yellow, into white, beige, brownish red, blue, and blue with aluminized quantity increase and deepen. The original earthy luster into corundum gloss or oily luster, sometimes surface appear slightly fuse fossil or crack;
2, alumina content increased 11 ~ 13%, other impurity gain micro;
3, volume reduced 23% or so,
4, ignition loss for 14.5%;
5, the water type LvShi or monohydrate aluminum - kaolinite type, into artificial corundum, mullite and a small amount of glass phase;
6, hardness by original 1 ~ 3 increased to more than eight;
7, bulk density from 2.5 g/cm3 increased to about 2.8 ~ 3 g/cm3 above;
8, water of crystallization, the structure of water, attached water all overflow;
9, structure by drainage, pine, soft into dense hard;
10, reduce water;
Slag resistance, alkali resistance increase,
12. Strength increase;
13. Permeability reduced;
14. The rate of gasification reduced;
15. Volatile component, easy combustion comb, soil smell disappear compleby;
16. Refractory degrees to 1780 ℃ above.
(3) calcined bauxite by calcining kiln different is divided into:
(1) the SHAFT furnace calcined BAUXITE (SHAFT KILN BAUXITE); (2) converter calcined BAUXITE (ROTARY KILN BAUXITE); (3) fall flame KILN alumina (ROUND KILN BAUXITE).
(4) calcined bauxite according to different purpose is divided into:
(1) refractory grade alumina; (2) the grinding grade alumina; (3) welding grade alumina.
6. Test index
(1) high bauxite (including Al2O385 % above) request inspection items:
Al2O3: refractory level 85 ~ 87% above, ground level above 86%, welding level above 87%; SiO2: refractory grade 6 ~ 7% and the grinding level 5 ~ 6% below; Fe2O3: refractory grade 1.6 ~ 2% below, wear-resisting level below 2%; TiO2: refractory grade 3.5 ~ 4% and the grinding grade 4 ~ 4.5% below; K2O + Na2O + CaO + MgO: refractory grade 0.5 ~ 1% and the grinding level below 0.5 ~ 1%. Welding grade alumina some also requires inspection phosphorus, sulfur, manganese projects.
B.D. (bulk density) : refractory grade 3.10 ~ 3.20 g/cm3, above ground level, welding level does not require testing the project.
L.O.I (ignition loss) : all is below 0.3%.
Size: according to the purchaser's demand bulation, usually have a natural block, 100 mm, fifty mm, 25 mm, 10 mm, 5 mm, 3 mm, 1 mm, etc.
Water: generally between 0.5 ~ 1.5%, more than button heavy or other terms.
(2) general alumina (including Al2O380 % above) request inspection items:
Refractory level: not less than 80%, Al2O3: Fe2O3: no more than 2%; B.D: not less than 2.8 g/cm3; Particle size and water according to the purchaser's called for.
In addition, still have the contract signed size for fine powder, general requirements in 100 ~ 200 mesh, percent of pass between 85 ~ 90%.
(3) bauxite request inspection items:
Al2O3: no less than 80%; Fe2O3:4 ~ 10%; TiO2: no more than 4%; SiO2: no more than 7%, size: according to buyer's request, make out.
(4) raw bauxite request inspection item:
Al2O3:70 ~ 73%; Fe2O3:1.5%; TiO2: no more than 4%; SiO2: no more than 6%; Ignition loss: 14 ~ 15%; K2O + Na2O + CaO + MgO
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