硫化碱浸工艺处理文丘里泥回收碲、硒

文丘里泥中含有金、银、铅、铋、砷、硒及碲等有价元素,返回卡尔多炉熔炼时,碲与金、银会生成化合物进入熔炼渣,造成损失;如果在返回卡尔多炉熔炼之前除碲,则不但回收利用碲资源,还增加了金银回收率。本文以某稀贵车间文丘里泥为原料,利用硫化钠对铅的抑制浸出作用,进行了NaOH-Na2S浸出及制备二氧化碲和粗硒的试验,实现了文丘里泥中碲和硒的回收。试验结论如下:在氢氧化钠浓度100 g/L、硫化钠加入量4%、反应温度80℃、碱浸2 h的优化条件下,碲、硒浸出率分别可达到90.06%、30.58%;加入与未加硫化钠工艺相比,粗二氧化碲品质可从80%提升至90%以上;动力学分析结果表明,文丘里泥硫化碱浸阶段碲的浸出受扩散模型控制。采用该工艺不但能提升金银回收率、回收碲资源,而且还提高了生产效率,所产出的二氧化碲纯度达到99%以上,副产粗硒纯度达到90%以上,经济效益显著。

粗硒蒸硒渣有价金属综合回收试验研究

粗硒蒸硒渣是粗硒真空蒸馏过程产生的一种副产物,富含铜、铅、硒、碲、金、银、铂和钯等有价金属,是回收贵金属的重要原料之一。该渣中硒、碲含量高且以多种物相结构存在,并与铜、金、银等形成互化物和包裹体结构,限制铜、铅、硒、碲等组分的选择性脱除,制约了其综合回收主干技术路线的选择。本文提出采用“两段氧化焙烧-常压碱浸和硝酸浸出”工艺,一段氧化焙烧-常压浸出可实现碲的较完全浸出,二段氧化焙烧-常压浸出可以实现脱硒,稀硝酸浸出可以除去渣中的铜和铅,从而实现贵金属富集。经过3段简单的工序,在几乎不损失贵金属的前提下,硒的脱除率达到92.72%,碲达到95.84%,铜达到95.43%,铅达到99.57%,该工艺为粗硒蒸硒渣中的贵金属与贱金属的分离提供了一条切实可行的路线。

Selection of reductants for extracting selenium and tellurium from degoldized solution of copper anode slimes

This paper focused on investigating high-efficient reductants of recovering selenium and tellurium from degoldizedsolution of copper anode slimes.Firstly,the effect of various reductants on recovery rates of Se and Te was investigated based onthermodynamic analysis of various metallic ions in degoldized solution.Secondly,the single factor experiments were made toinvestigate the effect of the process parameters on recovering Se and Te with hydrazine hydrate.Finally,the hydroxylaminehydrochloride was added to intensify the extraction efficiencies of Se and Te.The results indicated that hydrazine hydrate was themost suitable reductant,and the recovery rates of Se and Te are71.23%and76.50%,respectively;the recovery rates of Se and Tewere92.07%and97.81%,respectively,under the optimal process conditions of hydrazine hydrate dosage of0.2133mol/L,H+concentration of4.305mol/L,reaction temperature of85°C and reaction time of5h;the recovery rate of Se was97.59%,and that Tereached up to100%when hydroxylamine hydrochloride dosage was1.5116mol/L.