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Titanium dioxide pigment particles, treated with Silicon Dioxide and Al2O3 according to the invention, are characterised by improved tinting strength, reduced acid solubility and an isoelectric point shifted towards higher pH values. The invention relates to a method for coating the surface of inorganic particles in an aqueous phase, particularly of titanium dioxide pigment particles, with a dense skin of silicon dioxide and at least one further inorganic compound, particularly with aluminium oxide, where the coating largely consists of separate layers. In summary, we invent a new kind of pigment particle, which has a good tinting strength.

It is found that the viscosity and the activation energy for viscous flow of slags decrease as the CaO/Silicon Dioxide content increases from 1.00 to 1.20 and increase with incre asing the Al2O3content from 11.00 to 15.00 wt%. As for the break point temperature, it rai ses when theCaO/Silicon Dioxide and the Al2O3content increases. FTIR results reveal that the polymerizationdegree of complex viscous units in the slag decreases as the CaO/ Silicon Dioxide increases.However, it is opposite when the Al2O3 content increases. The variation of vis cosity and activation energy for viscous flow for the different CaO/SiO2and Al2O3content slags are explained.

The main chemical compositions of BF slag are CaO, Silicon Dioxide, MgO, Al2O3, and TiO2. The slags formed within the BF process due to the utilization of these ores result in higher viscosity, and poor operational stability, leading to the inefficient separation of slags from the hot metal, lower desulphurization slag capacity, and higher iron losses. In the BF iron-making process, the slag has significant effects on the production of pigiron, coke ratio, production cost, and BF service life. Thus, it is really necessary to study the viscous behaviors of titanium-bearing BF slags for maximizing the productivity and maintaining the iron-making operation. As the high-quality hematite ores become limited,vanadium–titanium magnetite has become an importantiron ore resource in the blast furnace (BF) operations withits abundance in China and as a source of Fe, V, and Ti for steel industry.



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