IL32685A - Decomposition of ilmenite - Google Patents

Description

Decomposition of Ilmenite SEA e present invention concerns a process for the decomposition of Ilmenite is an oxide mineral which mainly as a raw material the production Conventionally is produced from ilmenite by the known sulfate process or by a process which comprises as a first step treating the ilmenite with chlorine and carbon at an elevated temperature which a of and Both these compounds are distillable and can be fractionated in this fractionated distillation time constitutes the second step of the known In a third step the pure is to yield on the one hand and on the other hand which by calcination is converted into In Israel patent specification there a process for the of which comprises contacting the ilmenite with elementary carbon and bromine in the presence of an inert carrier gas at an elevated temperature not exceeding and recovering from the reaction mixture separately iron and unreacted titanium In accordance with that process the composition of the ilmenite is fully selective in that the bromine reacts only with the iron oxide component to form which continuously withdrawn from the reaction and condensed thereafter into solid In this way substantially pure is left residue and constitutes the desired reaction The selective decomposition of the iron oxide carbon brings about a selective reduction of the iron oxide to yield elementary and in the second the elementary iron resulting tho first step with the elementary bromine of the reaction mixture to 3 e this known process constitutes a considerable Improvement over the prior art has the disadvantage of requiring both elementary carbon and elementary which renders the process and the necessary equipment This applies in particular to the use of elementary bromine as highly corrosive so that its application introduces problems of corrosivity and makes necessary the use of bromine resistant view of the above it is the object of the present invention to provide an improved process for the decomposition of In accordance with the present invention it has surprisingly been found that a decomposition of llmenite is obtainable by means of hydrogen the present invention provides a process for the decomposition of ilmeni contacting the ilmenite with hydrogen bromide at a temperature of at least drawing from the reaction mixture iron bromide and collecting tho residual titanium She above reaction will preferably be carried out at a temperature within the range of The ilmenite for be a ture of by means of a electric furnace or with flue gases and hydrogen bromide is then through the as residue while the escaping iron bromide ie condensed outside the reaction vessel and in accordance with invention there are obtained iron bromide on the one hand and iOg on the other e obtained is substantially pure and represents a commercial concentrate of about 970 iron bromide obtained in accordance with the invention may decomposed to obtain known per so recovered may be used as such or converted into and It is also possible to compose the iron bromide with steam and thereby to obtain directly HBr which is then The process according to the invention is of practical advantage over that described in Israel Patent Specification 24806 in that in lieu of two one of which being highly only one single roactant is in many processes such as various hydrogen bromide is as product and can be as it is for purposes of the present She invention ie illustrated by the to which it is not 10 parts by weight of West Australian taining by weight by are continuously or intermittently charged in a rotary or vertical which is heated in a conventional way cally or by flue At a temperature of a mixture of nitrogen gas is introduced to the kiln in the course of The temperature is quickly raised to so that most of tho reaction the ilmenito and the acid takes place at this About 15 parts by weight of iron are leave the kiln with the hot The flue gases are or and are introduced to a cyclone where the solid are from the flue The remaining flue gases which comprise excessive HBr and formed by the reaction of HBr with are dehydrated and recycled to the S residual parts by weight of a bright gray contains with a small amount of iron content is by to the original ilmenite which contained iron separated in the may be decomposed to and HBr by steam at a temperature of to bromine with air at a temperature of or to iron metal and bromine by insufficientOCRQuality

Claims (1)

1. Process for decomposition of comprising contacting the with hydrogen at a temperature of at least w t d from the reaction mixture iron and collecting the residual titanium Process according to Claim the temperature of reaction within the range of insufficientOCRQuality