24 March 2003 00:00 [Source: ICB]Degussa subsidiary CyPlus has joined forces with Canadian mining and metals company Inco to launch a new cyanide detoxification process.
The new process, branded CombinOx, combines the best features of Inco's traditional sulphur dioxide/air process with Degussa's peroxygen technologies. The process replaces the air in the traditional Inco process with Caro's acid (peroxysulphuric acid).
Capital cost savings of 20-40% and reagent cost savings of 15-30% are claimed over traditional processes
A typical CombinOx plant consists of a Caro's acid generator (to generate Caro's acid from hydrogen peroxide and sulphuric acid), either a sulphur burner or dissolution station for sodium metabisulphite (to generate the sulphur dioxide), and the main cyanide detoxification reactor. Low residuals are claimed for both cyanides and heavy metals.
According to Eric Devuyst, Inco Tech's vice president, the advantage is 'flexibility to accommodate changes in feed chemistry'. Devuyst says that various mining firms have expressed interest in the process and that several laboratory test programmes have been completed.
The technology is being marketed exclusively through CyPlus, which is also providing full technical support services. The company says it requires a representative ore sample only to perform the laboratory testwork.
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