Untitled in english

Author(s)

Ailton Nascimento Silva

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
• Defense date: 2003-11-07

Examining board members

Marcelo Breda Mourão; Flavio Beneduce Neto; Cyro Takano

• Advisor: Marcelo Breda Mourão

Abstract

The production of white pigment for paint industry needs the use of Ti´O IND.2´ rich sources. It has been trying to develop enrichment processes of ilmenite. These developments try to be technologically attainable and with low environment aggression. One of these processes is the carbothermic reduction. On the other hand, this process is normally dependent on the type of ilmenite. It has been carried out thermogravimetric (TG) experiments of carbothermic reduction in a Brazilian ilmenite from monazitic sand processing, aiming at its enrichment in Ti´O IND.2´ for using in the pigment production. It has been investigated the reductant amount, the ilmenite particle size, and the reduction temperature. The reduction products were observed in optical microscope and in a SEM. The reduction rate increased with the increasing of reductant amount, with the increasing of the temperature and with the decreasing of the ilmenite particle size. It was verified the formation of metallic Fe particles with Ti in solution showing the unavoidable Ti´O IND.2´ reducing. The obtained apparent activation energies were 88-324 kJ.mol´POT. -1´ depending on the reduction conditions. (AU)