發(fā)布時間：2018-11-21 12:59

【摘要】：本研究選用的原料為湖南某鉛鋅礦浮選后的硫精礦,硫的品位約50%,如果不做預(yù)處理,直接浸出率只有9.82%,是典型的難處理金礦石,必須在浸出前將礦石中金的包裹體打開,使金裸露,才能有效提高浸出率。隨著國家對環(huán)保和節(jié)能的要求不斷提高,傳統(tǒng)的焙燒方式雖然可以收集尾氣進(jìn)行處理,但是能耗高,能量利用率低,采用更加高效的預(yù)處理方式是一種必然趨勢。國內(nèi)外對微波處理難浸金礦已經(jīng)開展了一些研究,但是面對如此高的硫品位,尚沒有實際指導(dǎo)。本課題探索了微波焙燒的基本條件,從環(huán)保的角度考慮,對尾氣進(jìn)行了及時收集處理。非氰浸金的研究是近些年提金領(lǐng)域的研究熱點,本研究采用了相對安全環(huán)保的碘化法浸金,避免氰化法或其他有毒浸出劑的使用,優(yōu)化了浸出條件,為碘化法的工業(yè)應(yīng)用提供了參考。本文的主要研究內(nèi)容有:(1)本礦為高砷含金硫精礦,分析了硫精礦的化學(xué)組成和粒積分布,S和Fe的含量很高,分別達(dá)到了49.93%和41.86%,粒度小于200目的占70%。XRD分析表明,原礦中金屬礦物主要為黃鐵礦(Fe S2),其他礦物的衍射強度很弱,脈石礦物主要為石英;(2)物相分析表明,高砷含金硫精礦中的非單體金大部分包裹于金屬礦物中,比例為98.57%。由TGA和DTGA分析可知,樣品從400℃開始到650℃左右時,發(fā)生較大的失重,失重率達(dá)27%;(3)當(dāng)微波功率為16 k W、焙燒時間為50 min、礦量為900 g時,樣品失重率可達(dá)28.12%。由微波焙燒前后的XRD譜可知,樣品的組成發(fā)生了明顯改變,Fe S2被氧化成Fe2O3。SEM分析的結(jié)果可知,焙燒前的硫精礦顆粒較大,結(jié)構(gòu)致密,表面光滑;而經(jīng)微波焙燒后,顆粒細(xì)小均勻且松散多孔,比表面積較之原礦增加明顯;(4)優(yōu)化碘濃度、碘和碘化鉀質(zhì)量比、液固比、和浸出時間,金的浸出率為71.56%,而未經(jīng)微波焙燒預(yù)處理的硫精礦,浸出率僅9.82%,效果顯著。
[Abstract]:The raw material used in this study is the sulfur concentrate after flotation of a lead-zinc ore in Hunan Province. The grade of sulfur is about 50. If no pretreatment is done, the direct leaching rate is only 9.82, which is a typical refractory gold ore. The inclusion of gold in the ore must be opened before leaching, so that the gold can be exposed so that the leaching rate can be improved effectively. With the increasing requirement of environmental protection and energy saving, the traditional roasting method can collect tail gas for treatment, but the energy consumption is high and the energy utilization is low. It is an inevitable trend to adopt more efficient pretreatment method. Microwave treatment of refractory gold deposits has been studied at home and abroad, but in the face of such a high sulfur grade, there is no practical guidance. In this paper, the basic conditions of microwave roasting are explored, and the tail gas is collected and treated in time from the point of view of environmental protection. The study of non-cyanide leaching of gold is a hot spot in the field of gold extraction in recent years. In this study, a relatively safe and environmentally friendly iodide method was used to extract gold, to avoid the use of cyanide or other toxic leaching agents, and to optimize the leaching conditions. It provides a reference for the industrial application of iodization method. The main contents of this paper are as follows: (1) the ore is a high arsenic-bearing gold-sulfur concentrate. The chemical composition and particle integral distribution of sulfur concentrate are analyzed. The contents of S and Fe are very high, reaching 49.93% and 41.86%, respectively. The results of 70%.XRD analysis show that the main metallic minerals in the raw ore are pyrite (Fe S2), the diffraction intensity of other minerals is very weak, and the gangue mineral is mainly quartz. (2) the phase analysis shows that most of the non-monomer gold in the high-arsenic gold-sulfur concentrate is wrapped in metallic minerals with a ratio of 98.57. The results of TGA and DTGA showed that the weight loss of the samples from 400 鈩，

本文編號：2347019