The present invention relates to a method of treating lead anode slime having high fluorine and arsenic content, in particular to a method comprising smelting of the lead anode slime and cleaning the produced off gases in a one or more wet gas cleaning stages.

The present invention relates to a method of treating lead anode slime having high fluorine and arsenic content, in particular to a method comprising smelting of the lead anode slime and cleaning the produced off gases in a one or more wet gas cleaning stages.

Extracting gallium and/or arsenic from materials comprising gallium arsenide is generally disclosed. In some example embodiments, a material comprising gallium arsenide may be exposed to a first heating condition to form a first exhaust. The first exhaust may be directed to an arsenic collection bed including aluminum, which may form aluminum arsenide. The material including gallium arsenide may be exposed to a second heating condition and/or a vacuum may be applied, which may form a second exhaust. The second exhaust may be directed to a gallium collection bed including aluminum, which may form gallium alloys of aluminum.

Extracting gallium and/or arsenic from materials comprising gallium arsenide is generally disclosed. In some example embodiments, a material comprising gallium arsenide may be exposed to a first heating condition to form a first exhaust. The first exhaust may be directed to an arsenic collection bed including aluminum, which may form aluminum arsenide. The material including gallium arsenide may be exposed to a second heating condition and/or a vacuum may be applied, which may form a second exhaust. The second exhaust may be directed to a gallium collection bed including aluminum, which may form gallium alloys of aluminum.

A method for monitoring copper-arsenic sulfidation separation in copper electrolyte purification process includes by PLC, timely acquiring changes in copper and arsenic concentrations in first-stage sulfidation monitoring module, determining a critical point where arsenic concentration slightly decreases, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving high-copper precipitation with minor-arsenic precipitation; timely acquiring changes in copper and arsenic concentrations in second-stage sulfidation monitoring module, determining a critical point where copper concentration decreases to near zero, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving complete-copper precipitation with minimal-arsenic precipitation; and timely acquiring changes in copper and arsenic concentrations in third-stage sulfidation monitoring module, determining a critical point where arsenic concentration decreases to a limit value, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving stable arsenic concentration.

A method for monitoring copper-arsenic sulfidation separation in copper electrolyte purification process includes by PLC, timely acquiring changes in copper and arsenic concentrations in first-stage sulfidation monitoring module, determining a critical point where arsenic concentration slightly decreases, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving high-copper precipitation with minor-arsenic precipitation; timely acquiring changes in copper and arsenic concentrations in second-stage sulfidation monitoring module, determining a critical point where copper concentration decreases to near zero, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving complete-copper precipitation with minimal-arsenic precipitation; and timely acquiring changes in copper and arsenic concentrations in third-stage sulfidation monitoring module, determining a critical point where arsenic concentration decreases to a limit value, and interlocking gas inlet valve to close and liquid outlet valve to open, achieving stable arsenic concentration.