tuProduct Introduction

  The bauxite ore, with the scientific name of alumyte and bauxite and extremely complex composition, is a general term for various alumina ores containing water from very different geological sources. Bauxite ores are usually formed by chemical weathering or exogenous action, and few of them are pure minerals, and they always contain some impure minerals, more or less clay minerals, iron minerals, titanium minerals and terrigenous heavy minerals.

 

The changes of physical and chemical properties of alumina after the calcination are as follows:  

  ① The appearance changes from the original gray, dark gray, grayish yellow, ashen and reddish yellow to white, beige, brownish red and blue, and blue deepens with the increase of aluminum content. The original earthy luster changes to the corundum luster or grease luster, sometimes with slight fused stones or cracks on the surface;

  ② The alumina content increases by 11-13 %, while other impurities increases slightly;

  ③ The volume is reduced by about 23%;

  ④ The loss on ignition is about 14.5%;

  ⑤ The hardness increases from the original 1~3 to more than 8;

  ⑥ The volume density increases from about 2.5 g/cm3 to over 2.8-3 g/cm3;

  ⑦ Crystal water, constitution water and adhesive water all overflow;

  ⑧ The structure changes from the sparse, loose and soft to the dense and hard;

  ⑨ The hydroscopicity decreases;

  ⑩ The refractoriness reaches 1,780°C or above.

 

Chemical indicators: 

  ① Al2O3: 80-87% or above; 

  ② SiO2: 6~7 % or below;

  ③ Fe2O3: 1.6-2% or below;

  ④ TiO2:3.5~4% or below;

  ⑤ K2O + Na2O + CaO + MgO: 0.5-1% or below; 

  ⑥ B.D. (bulk density): refractory grade: 3.10~3.20 g/cm3 or above. 

 

Granularity:

  It is customized as required by the buyer, and its common specifications include 0-1 mm, 1-3 mm, 3-5 mm, 5-8 mm, 8-15 mm, 200 meshes, 325 meshes, etc.

 

Application field:

  It is used for road paving.

 

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