【摘要】：傳統(tǒng)鋅濕法冶煉工藝“氧化焙燒-浸出-凈化-電積”中,硫化鋅精礦在氧化焙燒過(guò)程中不可避免的產(chǎn)生鐵酸鋅,而鐵酸鋅在低溫低酸中難以被溶出,導(dǎo)致鋅的浸出率不高,而且會(huì)產(chǎn)生大量鋅浸出渣,不僅浪費(fèi)了鋅鐵資源,還對(duì)環(huán)境造成嚴(yán)重的污染。所以課題提出了“磁化焙燒-低酸浸出-磁選”或“磁化焙燒-磁選-低酸浸出”處理高鐵鋅焙砂的新工藝,并對(duì)各工藝流程進(jìn)行了系統(tǒng)的研究,得出了一些有意義的結(jié)果:還原焙燒能使高鐵鋅焙砂中的鐵酸鋅選擇性的分解為氧化鋅和磁鐵礦,有利于提高鋅在低酸中的浸出率以及方便鐵的磁選回收。通過(guò)還原焙燒和磁選分離實(shí)驗(yàn)可知,采用“還原焙燒-低酸浸出-磁選”處理高鐵鋅焙砂的工藝是可行的,可以實(shí)現(xiàn)鋅鐵分離。鋅焙砂先經(jīng)磁選后,絕大部分鐵在磁精礦中,磁精礦再經(jīng)低酸浸出作業(yè)后。磁精礦Ⅰ的鐵品位可達(dá)52%、磁精礦Ⅱ的鐵品位可達(dá)49%,鐵的總回收率為92%,產(chǎn)出的鐵精礦可以與高品位的煉鐵原料搭配使用。整個(gè)工藝過(guò)程中損失的鋅為8.4%。通過(guò)組合鋅焙砂還原焙燒的條件實(shí)驗(yàn)得出最佳焙燒溫度800℃,焙燒時(shí)間45min,煙煤用量11%。磁選的最佳條件分別是磁場(chǎng)強(qiáng)度為800G,磁選時(shí)間1Omin,粒度450目,同時(shí)浸出的最佳條件是初始硫酸濃度為70g/L,浸出時(shí)間30min。在這樣的條件下可以使鐵有效的從組合鋅焙砂中分離。
[Abstract]:In the traditional zinc hydrometallurgical process, zinc ferrate is unavoidable in the oxidation roasting, leaching, purification and electrodeposition of zinc sulfide concentrate, but zinc ferrate is difficult to be dissolved at low temperature and low acid, which leads to the low leaching rate of zinc. Moreover, a large amount of zinc leaching slag will be produced, which not only wastes zinc and iron resources, but also causes serious environmental pollution. Therefore, a new process of "magnetization roasting-low acid leaching-magnetic separation" or "magnetization roasting-magnetic separation-low acid leaching" to treat high iron zinc calcine is put forward, and each technological process is systematically studied. Some significant results are obtained: reduction roasting can selectively decompose zinc ferrate into zinc oxide and magnetite in high iron zinc calcine, which is beneficial to increase leaching rate of zinc in low acid and to facilitate magnetic separation and recovery of iron. Through the experiments of reduction roasting and magnetic separation, it can be seen that it is feasible to treat high iron zinc calcine with "reduction roasting, low acid leaching and magnetic separation", and the separation of zinc and iron can be realized. After the zinc calcine is separated by magnetic separation, most of the iron is in the magnetic concentrate, which is then leached by low acid. The iron grade of magnetic concentrate I can reach 52%, the iron grade of magnetic concentrate 鈪，

本文編號(hào)：2414983