本文選題：難處理金礦 + 含碳含砷�。� 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：我國金礦資源儲量巨大,但主要以低品位難處理金礦為主。難處理金礦主要包括高碳金礦、微細浸染型金礦、復(fù)雜多金屬硫化礦型金礦,其中,高碳含砷金礦是極為常見卻也極為難處理的金礦之一,目前國內(nèi)外還沒有有效的方法進行處理。本文針對貴州泥堡高碳含砷難選金礦進行試驗研究,考察了多種選礦方法對高碳含砷金礦回收的影響,有效解決了高碳和高砷對金回收的影響。貴州泥堡高碳含砷難選金礦原礦石中金品位為3.46g/t,含硫5.55%,含砷0.37%。金的粒度微細并少量嵌布于脈石中,礦石含碳量、含粘土量較高,在浮選過程中易與硫化物一起被浮上來,對金的回收不利。論文通過浮選試驗,研究了浮選工藝、磨礦細度、調(diào)整劑用量、捕收劑用量等試驗條件對精礦指標(biāo)的影響,得到的結(jié)論如下：預(yù)先使用搖床重選拋廢,尾礦中金品位金金屬分布率均偏高。因此對該礦石不宜采用重選預(yù)拋廢方案。浮選閉路實驗結(jié)果顯示,階段磨浮流程與一段磨浮流程尾礦金品位指標(biāo)接近,宜采用一段磨浮流程,且磨礦細度為-200目占95%時效果最佳。且由于原礦中含碳量高、磨礦粒度細,預(yù)先脫碳時部分易浮金容易隨碳物質(zhì)上浮,長時間刮泡后仍難以消除碳物質(zhì)的影響,因此預(yù)先脫碳對后續(xù)作業(yè)的浮選時間及藥劑用量降低不明顯。浮選藥劑上,采用水玻璃1500g/t、硫酸銅400 g/t作為調(diào)整劑,丁銨黑藥125 g/t、乙黃藥240 g/t作為捕收劑,采用一段磨浮/一粗四精三掃的流程,試驗指標(biāo)最佳,為金精礦品位13.71g/t,金回收率78.24%。尾礦再磨再選對提高原礦金回收率意義不大,原因是礦漿粒度變細粘度增加,不利于氰化物溶液對礦石內(nèi)部滲透和擴散,影響礦石中金與氰化物的接觸,使金的浸出率降低。同時,加與不加絮凝劑沉降效果差異不大。因此尾礦進入尾礦庫后可進行自然沉降達到沉積目的。硫砷分離試驗結(jié)果表明,不論是采用浮硫抑砷的方案,還是浮砷抑硫的方案,采用氧化劑法、石灰銨鹽法、腐植酸鈉法或亞硫酸鈉法等不同的方法,不同pH、不同抑制劑、不同磨礦細度等條件均無法實現(xiàn)原礦或是浮選金精礦硫砷的有效分離。
[Abstract]:Gold reserves are huge in China, but mainly low grade refractory gold deposits. Refractory gold deposits mainly include high-carbon gold deposits, micro-disseminated gold deposits and complex polymetallic sulphide gold deposits. Among them, high-carbon arsenic-bearing gold deposits are one of the most common but also extremely difficult to deal with. At present, there is no effective method to deal with it at home and abroad. In this paper, the effects of various processing methods on the recovery of high carbon arsenic gold deposits are investigated, and the effects of high carbon and high arsenic on gold recovery are effectively solved. The gold grade is 3.46 g / t, sulfur 5.55 and arsenic 0.37 in the raw ore of high-carbon and arsenic-refractory gold deposit in Nipu, Guizhou Province. The gold particle size is fine and a little is embedded in the gangue. The ore has high carbon content and clay content. It is easy to be floated together with sulfide in the flotation process, which is disadvantageous to the recovery of gold. In this paper, the effects of flotation process, grinding fineness, dosage of adjuster and collector on the index of concentrate are studied. The distribution rate of gold grade in tailings is higher. Therefore, it is not suitable for the ore to adopt the scheme of gravity separation and pre-dumping. The results of closed circuit flotation experiment show that the gold grade index of tailings in the stage grinding process is close to that in the first stage grinding process, and the best effect is when the grinding fineness is -200 mesh and 95%. Because of the high carbon content and fine grinding granularity in the raw ore, some gold floats easily with the carbon matter in advance decarbonization, and it is difficult to eliminate the influence of carbon matter after long time scouring. Therefore, the advance decarbonization has little effect on the flotation time and dosage of reagents. In flotation reagents, water glass 1500 g / t, copper sulfate 400 g / t as adjuvant, ammonium butyrate 125 g / t, ethyl xanthate 240 g / t as collector, and one stage grinding floatation / one coarse four fine three sweep process were adopted. The test index was the best, the gold concentrate grade was 13.71 g / t, and the gold recovery rate was 78.244.The flotation reagents were as follows: water glass 1500 g / t, copper sulfate 400 g / t, ammonium butyrate 125 g / t, ethyl xanthate 240 g / t as collector. Regrinding and redressing of tailings is of little significance to increase the recovery of gold from raw ore, because the granularity of slurry increases and the viscosity increases, which is not conducive to the penetration and diffusion of cyanide solution into the ore, affects the contact between gold and cyanide in the ore, and reduces the leaching rate of gold. At the same time, the effect of adding flocculant is not different from that without flocculant. Therefore, the tailings can be deposited naturally after entering the tailings reservoir. The results of sulfur and arsenic separation test show that different methods, such as oxidizing agent, lime ammonium salt, sodium humate or sodium sulfite, have different pH and different inhibitors, regardless of the scheme of floating sulfur and arsenic, or the scheme of floating arsenic and sulfur suppression, and the methods of oxidant, lime ammonium salt, sodium humate or sodium sulfite, etc. Different grinding fineness and other conditions can not achieve the effective separation of sulfur and arsenic from ore or flotation gold concentrate.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD953

【參考文獻】

相關(guān)期刊論文 前6條

1 朱軍;劉蘇寧;;難處理金礦浸出技術(shù)的現(xiàn)狀與研究[J];礦業(yè)工程;2010年01期

2 王成輝;王登紅;黃凡;徐玨;陳鄭輝;應(yīng)立娟;劉善寶;;中國金礦集區(qū)及其資源潛力探討[J];中國地質(zhì);2012年05期

3 劉漢釗;難處理金礦石難浸的原因及預(yù)處理方法[J];黃金;1997年09期

4 吳榮慶;張燕如;張安寧;;我國黃金礦產(chǎn)資源特點及循環(huán)經(jīng)濟發(fā)展現(xiàn)狀與趨勢[J];中國金屬通報;2008年12期

5 鄭存江;熊英;胡建平;;微細粒包裹型金礦中金的賦存狀態(tài)掃描電鏡分析[J];理化檢驗(物理分冊);2006年04期

6 羅棟;王艷楠;;我國金礦資源現(xiàn)狀與找礦方向[J];資源與產(chǎn)業(yè);2013年04期

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