On Aspects Relating To A Hydrochlorination Facility For The Processing Of Refinery Precious Metal Residue Materials.

Abstract

A hydrochlorination facility was developed for tile processing of refinery precious metal residue materials on the laboratory and pilot scale. Hazard elements were identified and evaluated using an Event Tree Analysis. An exponential technique was applied to estimate the cost of the proposed production hydrochlorination facility. The estimated cost was R120 000. The Expected Present Value Ratio was +190 which indicated satisfactory project economics. The reactor material for the pilot scale unit was selected using a weighted values quantitative material selection procedure. Stainless steel Type 316L and Type 310 were selected. Failure of the Type 516L reactor occurred after 40 hours service. The mode of failure was extensive surface scaling which was attributed to the hydrogen chloride, sulphide gases and 1 000 °c operating envirornment. Subject to certain provisions it would be feasible to commission a safe and profitable production hydrochlorination facility. The consumable reactor concept was based on its replacement after 40 hours service. This was justifiable because of the high value of the material and the saving in down-stream processing costs.