Ecochem Aktiengesellschaft

Gianni Zoppi

Process for the treatment of fluoboric electrolyte

This process treats copper concentrates, either in the form of a primary sulfide, such as chalcopyrite, or a secondary sulfide, such as chalcocite and covellite, to obtain high purity copper metal having not less than 99.99% purity. In the case of a primary sulfide, the copper concentrate is subjected to leaching and is transformed into cement or a precipitated sulfide. In the case of the secondary sulfide, the copper concentrates are subjected to leaching with ferric fluoborate and fluoboric acid. Subsequent to leaching, the solution is subjected to copper electrowinning in a diaphragm cell to deposit copper on the cathode of the diaphragm cell.

Process for the production of high purity copper metal from primary or

A process for processing electric steelworks dusts containing oxidized high-iron, zinc-bearing materials in order to recover iron and zinc from [them] said dusts. The process includes the steps of: feeding the dusts to an induction furnace partially filled with a charge of metal or alloy to be smelted, wherein the charge is present as a molten bath that is made turbulent by induced currents; contacting the dusts with a surface of the turbulent molten bath inside the furnace; and reducing zinc and iron oxides contained in the dusts inside the furnace, while oxidizing zinc and carbon monoxide rising from the bath.

Process for reducing the electric steelworks dusts and facility for

The copper is selectively precipitated in the form of a sulfide from the solutions containing it, according to the reaction:

Production of electrolytic copper from dilute solutions contaminated by

The conditions for electrowinning Zn, Ni, Co and Cd metals from baths based on chlorinated ammino complexes of Me(NH.sub.3).sub.n Cl.sub.m type are substantially improved by the addition of small levels of dissolved Br, which considerably reduce the cell voltage without exerting any negative effects on cathodic current yields.

Process for heavy metals electrowinning

A process for producing metals, Me, selected from zinc, nickel, cadmium and cobalt, in which the corresponding water-soluble ammino complex Me(NH.sub.3).sub.n Cl.sub.m is formed, and such a complex, in an aqueous solution, is submitted to electrolysis in a cell which is free of there being a separator structure between the anodic and the cathodic compartments.

Process for heavy metal electrowinning

A process for the production of alkali metal hydroxides, such as caustic soda, and elemental sulfur, characterized in that to an electrochemical cell an aqueous solution of an alkali metal sulfide, e.g., sodium sulfide, is fed in order to cause the following reactions to take place:

Process for the production of alkali metal hydroxides and elemental

Copper scrap, reduced to particulate form having particle sizes not larger than 50 mm, is leached in a suitable apparatus with a solution of ferric fluoroborate in fluoroboric acid. During leaching, copper is dissolved, with ferric fluoroborate simultaneously being reduced to ferrous fluoroborate according to the following reaction:

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Dino di Sonvico, Switzerland

Gianni Zoppi