Abstract: A method of manufacturing a valuable material product from an industrial dust is described. The method comprises: i) providing the industrial dust which comprises at least one valuable material and a first concentration of volatile constituents to a heating device with an operation temperature of 600° C. or more, ii) processing the industrial dust by the heating device, wherein processing comprises: iia) heating the industrial dust with a rate of 20° C./min or more, iib) thermally treating the industrial dust by the heating device with a treating temperature in the range of 900° C. to 1200° C., in particular in the range of 1000° C. to 1100° C., for 30 minutes or more, and iic) controlling and/or regulating the oxidizing conditions during processing, wherein processing comprises: at least partially removing the volatile constituents from the industrial dust, and iii) providing the valuable material product. Furthermore, the processed valuable material product is described.

Abstract: Embodiments of the invention relate to a process for removing fluoride from a solution or suspension containing zinc, in particular a solution of zinc sulfate, a defluoridated solution of zinc sulfate obtainable by such a process, its use as well as processes for producing zinc and hydrogen fluoride or hydrofluoric acid. The process for removing fluoride comprises (i) providing a solution or suspension A containing zinc, wherein the solution or suspension A containing zinc further contains fluoride ions; (ii) adding a solution B containing a dissolved salt of a rare earth element to the solution or suspension A containing zinc, wherein a solid comprising a rare earth element fluoride and a solution C containing zinc are formed; and (iii) separating the solid from the solution C containing zinc, wherein the solution C containing zinc has a lower concentration of fluoride ions than the solution or suspension A containing zinc.

Abstract: Embodiments of the invention relate to a process for removing fluoride from a solution or suspension containing zinc, in particular a solution of zinc sulfate, a defluoridated solution of zinc sulfate obtainable by such a process, its use as well as processes for producing zinc and hydrogen fluoride or hydrofluoric acid. The process for removing fluoride comprises (i) providing a solution or suspension A containing zinc, wherein the solution or suspension A containing zinc further contains fluoride ions; (ii) adding a solution B containing a dissolved salt of a rare earth element to the solution or suspension A containing zinc, wherein a solid comprising a rare earth element fluoride and a solution C containing zinc are formed; and (iii) separating the solid from the solution C containing zinc, wherein the solution C containing zinc has a lower concentration of fluoride ions than the solution or suspension A containing zinc.