Enrichment and separation method of chromium in multi-metal mixed resources of waste circuit boards
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 element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the multi-metal complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~76% and ~4.5%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared 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, the power supply of the vacuum heating furnace was started, and the polymetallic mixture in the melting furnace was heated until the temperature reached ~1400° C., and the temperature was maintained for 5...
Embodiment 2
[0035] In this example, a verification experiment was carried out for the separation of chromium element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the polymetallic complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~78% and ~4.3%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared 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, the power supply of the vacuum heating furnace is started, and the multi-metal mixture in the melting furnace is heated until the temperature is ~1400° C., and the temperature is kept for 5 minutes. Aft...
Embodiment 3
[0037] In this example, a verification experiment was carried out for the separation of chromium element in the multi-metal mixture of waste circuit boards. Firstly, chemical analysis was carried out on the polymetallic complex mixture containing chromium element in the crushed + sorted waste circuit boards, and the mass contents of copper and iron were measured to be ~76% and ~4.4%, respectively. Iron metal disassembled from electronic waste is added to the complex polymetallic mixture as a collector iron element, and after adding iron, the mass content of iron in the polymetallic mixture reaches -30%. Put the prepared 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, the power supply of the vacuum heating furnace is started, and the multi-metal mixture in the melting furnace is heated until the temperature is ~1400° C., and the temperature is kept for 5 minutes. Aft...
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