本文關(guān)鍵詞： 含鍺中浸渣 微波焙燒 介電常數(shù) 鍺　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：鋅冶煉過程副產(chǎn)物含鍺中性浸出渣(中浸渣)是目前鍺冶金主要原料之一,針對(duì)常規(guī)氧化焙燒過程加熱時(shí)間長、溫度高、操作環(huán)境差以及長時(shí)間焙燒已氧化的可溶鍺向不溶鍺轉(zhuǎn)變的問題,本論文以鋅冶煉過程含鍺中浸渣為原料,提出微波強(qiáng)化焙燒含鍺中浸渣新工藝,主要對(duì)微波焙燒溫度、微波焙燒時(shí)間、微波焙燒料層厚度,以及微波焙砂功率對(duì)鍺浸出率的影響進(jìn)行研究,并對(duì)比企業(yè)焙砂得出微波強(qiáng)化焙燒含鍺中浸渣原理。本課題開展了含鍺中浸渣介電常數(shù)、升溫特性研究,確定了含鍺中浸渣在微波場(chǎng)中介電常數(shù)變化規(guī)律及升溫特性,為微波焙燒含鍺中浸渣提供指導(dǎo),同時(shí)為豐富微波介電常數(shù)數(shù)據(jù)庫提供了一組切實(shí)可靠的數(shù)據(jù);通過對(duì)含鍺中浸渣微波焙燒后所得的焙砂進(jìn)行粒度分析、掃描電鏡分析,表明通過微波焙燒后,焙砂顆粒減小,比表面積增大,微波能一定程度上減小礦物顆粒粒度,同時(shí),微波焙燒后在焙砂表面可看到裂紋,在后續(xù)浸出過程中顯著改善了浸出動(dòng)力學(xué)條件,使鍺的浸出率增大,降低了浸出難度。微波焙燒含鍺中浸渣最優(yōu)焙燒溫度為450℃,最優(yōu)焙燒時(shí)間為2.5h,最優(yōu)料層厚度為1.32cm,最佳功率為1200W,在該條件下,所得鍺的浸出率達(dá)90.16%。通過對(duì)比微波焙燒含鍺中浸渣及常規(guī)馬弗爐焙燒,各焙砂中鍺較原料中浸渣富集了一倍左右,通過微波焙燒較常規(guī)馬弗爐、企業(yè)焙砂鍺的回收率高約20%;達(dá)到相同浸出率條件下,微波焙燒時(shí)間由企業(yè)常規(guī)焙燒24h及常規(guī)馬弗爐7h焙燒縮短為2.5h,節(jié)約時(shí)間分別為89.58%、64.28%,同時(shí)顯著改善氧化過程操作條件及氧化焙燒過程和浸出過程的動(dòng)力學(xué)條件。
[Abstract]:Neutral leaching slag containing germanium in zinc smelting process is one of the main raw materials of germanium metallurgy at present. The heating time is long and the temperature is high in the conventional oxidation roasting process. The operation environment is poor and the problem of long time calcination of oxidized soluble germanium to insoluble germanium transformation. In this paper, a new technology of microwave enhanced roasting of germanium in leaching slag is put forward, which is based on the leaching slag containing germanium in zinc smelting process as raw material. The effects of microwave calcination temperature, microwave roasting time, thickness of microwave roaster layer and microwave baking power on the leaching rate of germanium were studied. The principle of microwave enhanced roasting of germanium in leaching slag was obtained by comparing with enterprise calcine. The dielectric constant and heating characteristics of germanium in leaching slag were studied in this paper. The variation law of intermediate electric constant and heating characteristics of germanium containing leaching slag in microwave field were determined, which provided guidance for microwave roasting of germanium in leaching slag, and provided a set of reliable data for enriching microwave dielectric constant database. The results of particle size analysis and SEM analysis showed that the calcine particles decreased and the specific surface area increased after microwave roasting. At the same time, cracks can be seen on the surface of baking sand after microwave roasting, and the leaching kinetics conditions are improved obviously during the subsequent leaching process, and the leaching rate of germanium increases. The leaching difficulty was reduced. The optimum roasting temperature was 450 鈩，

本文編號(hào)：1461866