Patent ID: 6024932
Filing Date: 2000-02-15
Classification: C01B

Abstract:
A process for sulfur recovery from a metal sulfate, which comprises the steps of:feeding said metal sulfate to a first reactor;feeding a reducing agent to said first reactor, said reducing agent including recycle carbon monoxide from a step of contacting sulfur dioxide with a carbonaceous matter;contacting said metal sulfate and said reducing agent at a temperature and for a period of time sufficient to effect reduction of said metal sulfate to a metal sulfide thereby producing a product stream containing said metal sulfide and gaseous waste by-products of said reduction;removing said product stream from said first reactor;separating said metal sulfide from said gaseous waste by-products in said product stream;oxidizing said metal sulfide to form a metal oxide and sulfur dioxide in a second reactor;contacting said sulfur dioxide with carbonaceous matter to produce elemental sulfur and said recycle carbon monoxide, said recycle carbon monoxide being produced in sufficient quantity and purity for use in said step of reducing said metal sulfate to form said metal sulfate;recycling said recycle carbon monoxide for use as a portion of said reducing agent in said step of reducing said metal sulfate to form said metal sulfide; andincinerating said waste by-products from said reduction and using the heat produced thereby to heat said metal sulfate fed to said first reactor.