Ua koʻikoʻi ka hui ʻenehana mai UrbanMines i ke aʻo ʻana i ka unuhi ʻana i ke keleawe mai ka smelter slag, i hoʻopili ʻia i ka sulphating. Hana ʻia ka sulphating o ka slag epyriteʻO nā huelo hoʻopaʻa a i ʻole flotation ma nā mahana mai 500 a 650°C, a ua hoʻokahe ʻia ka calcine me ka wai.Ua hōʻike nā hopena i ka loaʻa ʻana o ka leaching keleawe kiʻekiʻe (70-73%) mai ka calcine, i loaʻa ma ka sulphating ʻelua a ʻekolu mau hola ma 550 o C. He koho ke kaʻina hana no ka mea he 3-5% wale nō o ka hao i hoʻolele ʻia.Ma waho aʻe o ka sulphating wela, ua ʻike ʻia he hopena nui i ka leaching keleawe i ka pyrite/flotation tailings: ratio.Loaʻa nā hopena maikaʻi loa ma ka sulphating o 5.00 g slag me 2.00 g o pyrite a i ʻole 3.00 g o nā huelo.
Hoʻoheheʻe keleawe ma o Additive
E puhi i ka ea a mehana e hana i ka hao apyritehiki i ka pae oxidation
2CuFeS2 + 3O2→2CuS + 2FeO + 2SO2
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E hoʻomehana i ka calciate, quartz a me pyrite i 1100℃
CuS + S（i ka pyrite）+ O2→Cu2S + SO2
I ka wā e hoʻoheheʻe ai ka sulfide cupric
CaCO3 + SiO2→CaSiO3 + CO2
CaSiO3 + FeO + SiO2→2(Fe,Ca)SiO3
No laila e hoʻohua ai i ka hao hao i hui pū ʻia me nā ʻōpala umu a hoʻokaʻawale iā lākou
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E unuhi i ka cupric sulfide a puhi i ka ea
Cu2S + O2→2Cu + SO2↑
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Inā pono, e hana hou i ka electrolytme ka waika sulfuric a me ka solution cupric sulfide
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Hana hou i ke gula, ke kala a me ka platinum mai ka mea haumia i hoʻoheheʻe ʻia
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E mālama i ke kēpau i unuhi ʻia mai loko mai o ka ʻoa ma kahi ma luna o ka helu heheʻe
E hoʻokaʻawale a lana i luna ke keleawe me ka helu heheʻe kiʻekiʻe