High Grade Refractory Material Calcined Bauxite for Rotary Kiln 0.3% CrO Content

Calcined bauxite, referred to as high aluminum material, with its clinker made of all kinds of high aluminum bricks, metallurgical industry and other industries are widely used in refractory or anticorrosion materials, especially in the top of the electric furnace, blast furnace and hot stove use, refractory effect is very significant, the performance is better than ordinary clay refractory brick. Bauxite, also known as bauxite, bauxite, is a white or off-white earthy mineral.Part of bauxite due to iron brown yellow or light red, its density range of 3.9~ 4G /cm3, Mohs hardness range of 1~3, brittle, opaque, high melting point, insoluble in water, easily soluble in strong acid and alkali solution.
Bauxite is formed by mica, feldspar and other minerals, the composition of complex, the main component is the alumina hydrate containing impurities, such as, diaspore (γ-alo (OH)), diaspore (α-alo (OH)) and triaspore (Al2O3·3H2O).Some are composed of kaolinite (2SiO2·Al2O3·2H2O) and bauxite;Some are mainly kaolinite, and with the increase of kaolinite content, it is composed of bauxite or kaolinite clay.

(1) the homogenization.
China's homogenizing bauxite production enterprises used homogenizing methods are mainly dry and wet method.Among them, the dry homogenization production process is simple, the cost is low, but it can not effectively remove impurities;The wet homogenization process has good homogenization degree, can effectively remove iron and other impurities, dust pollution is also small, but the process route is longer, increasing the economic cost.
(2) shape.
The molding method mainly includes pressing brick, pressing ball and extrusion molding.Brick pressing molding process equipment cost is low, but the production efficiency is low, may cause product stratification;The efficiency of ball forming is high, but the requirement of subsequent firing equipment is high.Vacuum mud extruding is of high efficiency and suitable for large-scale continuous production, but the drying cost is high.
(3) burning.
Sintering is the focus, mainly on crystal development.Vertical kilns, rotary kilns and tunnel kilns are commonly used calcining equipment.Among them, tunnel kiln firing efficiency is high, relatively safe, and the ore phase is stable and uniform.The products produced by the inverted flame kiln are of good quality, but the cycle is long and the energy consumption is large, not the direction.And the rotary kiln firing efficiency is high, but there is a risk of product burning through.

Bauxite clinker • instructions for use
The main minerals of bauxite clinker are bauxite and aluminosilicate. The content of bauxite increases with the increase of the proportion of aluminum oxide and silicon dioxide.The secondary minerals are rutile, iron ore, etc.It sometimes contains small amounts of pomegranite and dicakhite.According to the high bauxite containing three chemical two aluminum level, generally can be divided into 3 grade 5, its content and color are:
First class super 85% or above earth gray or dark gray
First grade 75-85% earth grey or dark grey
Second level 65-75% white grey
Third grade and third grade 50-65% cyan gray
Level 4 is less than 50% cyan gray
Bauxite clinker belongs to sedimentary deposit, which is divided into soil ore and vein ore.Native ore, topped with hard red clay, with a thick layer of limestone, known as "ginger stone".The ore body is layered, with a large area, up to several miles long along the strike. The thickness of the ore is generally 3-4 meters, and then up to 7-9 meters or more. The material is pure and the structure is hard and compact.Stone vein mine is covered by limestone, the area is small, is a nest of output, generally more than ten meters to dozens of meters a nest, sometimes mixed with limestone, sandwicate a layer of fine red cement, the material is coarse and not too pure.

Bauxite clinker - production process
The mining method generally adopts the open-pit excavation from the slope of Mingshan.In deeper burial places, there are also methods of drilling.Because raw material is difficult to distinguish grade in appearance, it must be mined in layers according to the grade of the original ore bed.The top of the deposit is Qingzeng, the bottom is Grade III and Grade II materials, and the bottom is Grade I materials.It is difficult to distinguish three or four grade materials from one or two grade materials, so attention should be paid to identification when mining.Some vein deposits are close to or mixed with pyrite, and non-high aluminum impurities should be removed, otherwise it will bring difficulties to satin burning and affect the quality of clinker.The raw materials produced according to the grades shall be stacked and separately forged and burned according to the grades, without mixing grades, which will affect the sound output value.

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Henan hongtai kiln refractory co., LTD. Main products are high alumina brick, clay brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India, Korea, Pakistan, kazakhstan, other southeast Asian countries and regions.