Enrichment and separation method for chromium elements in discarded circuit board multi-metal mixed resource
A technology for waste circuit boards and separation methods, applied in the direction of improving process efficiency, etc., can solve the problems of large consumption of chemical reagents, limited effect, waste of resources, etc., reduce secondary pollution, simple method, and energy saving Effect
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Embodiment 1
[0033] In this example, a verification experiment was carried out for the separation of chromium elements in the polymetallic mixture of discarded circuit boards. Firstly, chemical analysis was carried out on the complex multi-metallic mixture containing chromium in the waste circuit boards after crushing and sorting, and the mass content of copper and iron in it was measured to be ~76% and ~4.5% respectively. Add ferrous metals dismantled from electronic wastes into the polymetallic complex mixture as a collector iron element, and after adding iron, make the iron mass content in the polymetallic mixture reach to 30%. Put the configured multi-metal complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, start the power supply of the vacuum heating furnace, heat the polymetallic mixture in the melting furnace until the temperature reaches ~1400° C., and keep the temperature for 5 minutes...
Embodiment 2
[0035] In this example, a verification experiment was carried out for the separation of chromium elements in the polymetallic mixture of discarded circuit boards. Firstly, the chemical analysis of the multi-metal complex mixture containing chromium in the waste circuit boards after crushing and sorting was carried out, and the mass content of copper and iron in it was measured to be ~78% and ~4.3% respectively. Add ferrous metals dismantled from electronic wastes into the polymetallic complex mixture as a collector iron element, and after adding iron, make the iron mass content in the polymetallic mixture reach to 30%. Put the configured multi-metallic complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, start the power supply of the vacuum heating furnace, heat the polymetallic mixture in the melting furnace until the temperature is ~1400° C., and keep it warm for 5 minutes. Afterw...
Embodiment 3
[0037] In this example, a verification experiment was carried out for the separation of chromium elements in the polymetallic mixture of discarded circuit boards. Firstly, the chemical analysis of the multi-metal complex mixture containing chromium in the waste circuit boards after crushing and sorting was carried out, and the mass content of copper and iron in it was measured to be ~76% and ~4.4% respectively. Add ferrous metals dismantled from electronic wastes into the polymetallic complex mixture as a collector iron element, and after adding iron, make the iron mass content in the polymetallic mixture reach to 30%. Put the configured multi-metallic complex mixture in the graphite crucible of the vacuum heating furnace, seal the vacuum heating furnace, and start the vacuum pumping system. Then, start the power supply of the vacuum heating furnace, heat the polymetallic mixture in the melting furnace until the temperature is ~1400° C., and keep it warm for 5 minutes. Afterw...
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