SU276028A1 - METHOD FOR CHLORINATING TITANIUM-CONTAINING MATERIALS - Google Patents

Description

The invention relates to methods for the chlorination of titanium-containing materials and can be used in the manufacture of titanium tetrachloride.

A known method for the chlorination of titanium-containing materials, taken in the form of granules or briquettes, with chlorine-containing gas in continuous shaft chlorinators in the presence of an excess amount of carbonaceous reducing agent in the initial product. The chlorination process in these chlorinators is carried out with continuous unloading of the non-chlorinated residue from the chlorinator, followed by the return of a large fraction of this residue.

According to the proposed method, an excess amount of carbonaceous reductant is introduced by loading into the chlorinator, lumpy low-ash coke with its subsequent unloading and returning to the chlorinator. It is advisable to discharge the coke from the chlorinator at a temperature of 300-700 ° C.

This improves the operation of the chlorinator (decreases thermal stress in the reaction zone, which increases the service life of the apparatus; improves the heating of chlorine; increases its completeness; makes it possible to use chlorine-containing titanium dioxide production gas by burning titanium tetrachloride), and also increases its performance.

Example. Coked titanium containing briquettes in the amount of 15 g and 3.5 g of pitch coke are loaded into the continuous shaft chlorinator. The chlorinator operates normally for industrial conditions. In the vapor-gas mixture leaving the chlorinator, the CO: CO ratio is 1-1.5: 1

(instead of 2: 1 by a known method). The temperature of the gas-vapor mixture is 600-650 ° C (instead of 750-800 ° C by a known method). When unloading, a cinder is obtained with a temperature of about 450 ° C. The calcine consists of unreacted coke and fines sprinkled from the chlorinated briquettes, which means that the chlorine is complete. In turn, a decrease in the temperature of the vapor – gas mixture and an increase in its carbon dioxide content indicates the possibility of increasing the productivity of the chlorinator.

Subject invention

25

1. Chlorination of titanium-containing materials, taken in the form of granules or briquettes, with chlorine-containing gas in continuous shaft chlorinators with an excess of carbonaceous reducing agent, characterized in that, in order to improve the operation of the chlorinator and increase its productivity, an excess amount of carbonaceous reducing agent is introduced t by loading into the chlorinator lump low-ash coke with-5 4 following its unloading and return to the chlorinator. 2. A method according to claim 1, characterized in that the discharge of low-ash lumpy coke from the chlorinator is carried out at a temperature of 300-700 ° C.