How to remove silica from slag
The precipitation separated washed and calcined at a temperature of 950-1200 DEG C, get a alumina powder, the mother liquor can be recycled. In the lattice type alpha alumina, oxygen ion for the six party close packing, Al3+ symmetrically distributed in eight sides surrounded with oxygen ion centers, crystal lattice can be great therefore, melting point, boiling point is high. Alpha alumina insoluble in water and acid, also known as alumina industry, is the basic raw material of aluminum;
It was crushed by high temperature sodium hydroxide solution impregnation, obtain sodium aluminate solution; remove the filter residue, the filtrate cooling and adding aluminum hydroxide crystal, after long time stirring, sodium aluminate solution decomposition precipitation of aluminum hydroxide precipitation;
Alumina is aluminum hydroxide in low temperature 140-150 degrees Celsius under dehydration, also called activated alumina, alumina industry. For the cubic close packed oxygen ion in the structure approximation, Al3+ irregularly distributed in eight surface and tetrahedral interstices surrounded by oxygen ions. Alumina insoluble water soluble in strong acid or alkali solution, it is heated to 1200 DEG C is converted to alpha alumina. Gamma alumina is a porous material, the inside surface area per gram of up to hundreds of square meters, the high active adsorption ability. Industrial products are often cylindrical particles with colorless or pale pink the pressure is good. In oil refining and petrochemical industry is a commonly used adsorbent, catalyst and catalyst carrier; in industry is the acid removal agent of transformer oil, turbine oil, also used for chromatographic analysis in the laboratory is strong neutral; The desiccant, drying capacity is not less than the use of phosphorus pentoxide, after repeated use in 175 DEG 6-8h heating can regenerate.
