本文選題：電解錳渣 + 電場��； 參考：《重慶大學》2015年碩士論文

【摘要】：電解錳是冶金、航天、化工等工業(yè)部門的關鍵基礎材料。然而,我國電解錳產(chǎn)業(yè)在快速發(fā)展的同時,也面臨著巨大的資源和環(huán)境壓力,尤其是電解錳渣的無害化處理和資源化利用已成為日益突出的問題。錳渣中含有大量錳元素,而錳元素的回收不僅能減輕環(huán)境污染,而且還能創(chuàng)造巨大的經(jīng)濟效益。實驗發(fā)現(xiàn)電解錳渣庫存堆積一定時間后,其物理化學性質(zhì)發(fā)生了明顯變化。傳統(tǒng)浸出方法不能實現(xiàn)舊渣中錳元素的高效浸出,于是本文提出電場強化與藥劑強化舊電解錳渣的浸出研究。在電場強化錳渣浸出的過程中,探索了浸錳的條件,并對浸錳條件進行了優(yōu)化。通過實驗可知:室溫(25℃)條件下,當液固質(zhì)量比為5:1,,電流密度為250A/m2,硫酸體積濃度為1%,浸出時間為1h,錳浸出率可達到89.15%。繼續(xù)增加液固質(zhì)量比、電流密度、硫酸體積濃度、浸出時間等,浸出率增加不明顯,反而加大了浸出過程的成本和能耗。對電場強化浸出后的浸出液進行了錳回收實驗研究。研究發(fā)現(xiàn)浸出液中存在鐵雜質(zhì),為了得到比較純凈的錳產(chǎn)品,在浸出液中加入少量軟錳礦,50℃下通入空氣1h,調(diào)節(jié)p H值至6.0,加入少量活性炭,冷卻后抽濾,對浸出液進行除雜凈化。然后,采用碳化沉淀法對浸出液中錳元素進行了回收,回收率為97.77%,沉淀中錳元素含量為43.47%,沉淀的物相主要是Mn3O4,Mn O2和Mn CO3。錳渣在長期存放過程中逐漸凝結(jié)成堅硬的塊狀,而且低價錳逐漸被氧化為二氧化錳,在酸性溶液中引入電場,會有H·自由基生成,而H·自由基可以將Mn O2還原為Mn2+溶解在溶液中。從而使不溶的二氧化錳溶解。而且,電場可以改變二氧化硅、二水硫酸鈣等脈石礦物表面的電荷分布,促使顆粒相互碰撞,使包裹在錳顆粒周圍的脈石礦物解散。這樣含錳顆粒就會被陰極產(chǎn)物還原浸出。在藥劑強化錳渣浸出實驗中發(fā)現(xiàn),常溫條件下,草酸和水合肼強化錳渣中錳元素的浸出效果較好。草酸強化錳渣浸出的較優(yōu)工藝條件為,草酸與錳渣質(zhì)量比為4%,硫酸體積濃度為1.0%,液固質(zhì)量比為5:1,反應時間為1h。水合肼強化錳渣浸出過程,在水合肼體積濃度為0.5%,硫酸體積濃度為1.0%,液固質(zhì)量比為4:1,反應時間為1h的條件下,錳浸出率達到90.91%。
[Abstract]:Electrolytic manganese is a key basic material in metallurgical, aerospace, chemical and other industrial sectors. However, with the rapid development of electrolytic manganese industry in China, it is also facing great pressure of resources and environment. Especially, the harmless treatment and utilization of electrolytic manganese slag has become an increasingly prominent problem. Manganese residue contains a large amount of manganese elements, and the recovery of manganese elements can not only reduce environmental pollution, but also create great economic benefits. It was found that the physical and chemical properties of electrolytic manganese slag changed obviously after a certain period of storage. The traditional leaching method can not realize the high efficiency leaching of manganese in the old slag, so the electric field strengthening and the medicament strengthening the leaching of the old electrolytic manganese slag are put forward in this paper. In the process of leaching manganese slag by electric field, the conditions of manganese leaching were explored, and the conditions of manganese leaching were optimized. Under the condition of 25 鈩，

本文編號：1839156