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黄金洞焙砂浸金率低的原因分析 总被引:1,自引:1,他引:1
郁强 《中国有色金属学报》1998,8(2):318-321
采用TG-DTA热分析法、X射线衍射法对黄金洞焙砂的结构进行了研究,结果表明,黄金洞焙砂中仍含有8%的硫,并以单质硫,Fe1-xS,Fe1-x-yS和FeS2等形式存在。由于硫化物包裹的金不能暴露于氰化液中,以及这些物质的存在会大量消耗氰化过程中所需要的氧,因而导致黄金洞焙砂浸金率低。而此焙砂分别经300℃,580℃焙烧处理后,焙砂氰化浸金率相应地提高到91.7%和93%。因此黄金洞焙砂浸金率低的原因是脱硫阶段氧化气氛不足,脱硫不完全,是焙砂欠烧而非过烧造成的。 相似文献
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Gong Qian Hu Jiexue Cao Changlin Institute of Chemical Metallurgy Academia Sinica Beijing China 《中国有色金属学会会刊》1993,(4)
The reaction process for leaching gold from sulfide gold concentrates containing copperwith ammonia-ammonium thiosulfate solution containing copper(Ⅱ)can be divided into initialstage and later stage of reaction.Initial stage of reaction is controlled by interface reaction.Lat-er stage of reaction is controlled by diffusion process of reaction through solid products layer.Whole leaching process is under the control of corrosion reaction of pyrite bearing gold.Actionof ammonium sulfate in the system is probably as follows:(1)NH_4~ and NH_3 forms a buffer so-lution;(2)SO_4~(2-)ion inhibites the oxidation and decomposition of S_2O_3~(2-)ion.Cu~(2 )ion in thesystem acts as an oxidant and oxygen makes the Cu~(2-)regenerate. 相似文献
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BEHAVIOUROFELEMENTALSULPHURINBIOOXIDATIONOFGOLD-BEARINGSULPHIDEORES¥XiangLan;KeJiajun(InstituteofChemicalMetallurg,ChineseAca... 相似文献
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BRECCIATIONANDGOLDMINERALIZATIONOFORE-HOSTINGROCKSINLAOYACHAOGOLDDEPOSIT¥YuXingzhen;LiPeilan(DepartmentofGeology,CentralSouth... 相似文献
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高炉常用耐火材料导热系数的测定 总被引:1,自引:0,他引:1
采用激光脉冲法及使用DSC实测高炉用耐火材料的热扩散率及比热容,进而获得其导热系数.重点考察了温度及温度履历对耐火材料热扩散率及比热容的影响,得出二者与温度依存关系的数学模型,进而获得各种耐火材料的导热系数对温度的依存关系.测量结果表明:(1)除铝碳质耐火材料,其他耐火材料经一次高温后,测得的热扩散率值比第一次升温时的测得值增大,且温度特性随着温度变化呈现唯一的变化关系.而铝碳质耐火材料则相反,且随着升、降温过程的延续,热扩散率值逐渐减.(2)随温度的增加,比热容先较快增大后缓慢增加,温度履历对热容的测定基本没有影响.(3)根据测定结果,建立了导热系数λ(W/m·K)与温度T(K)之间的数学模型,经检验,该模型可有效地预测高炉常用耐火材料的导热系数. 相似文献
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SELECTIVE COPPER REMOVAL FROM CUPRIFEROUS GOLD CONCENTRATE 总被引:5,自引:0,他引:5
SELECTIVECOPPERREMOVALFROMCUPRIFEROUSGOLDCONCENTRATEDeng;Tong(InstituteofChemicalMetallurgy,AcademiaSinica,Beijing100080)Muir... 相似文献
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耐火砖成形模的选材及制造工艺研究 总被引:3,自引:0,他引:3
选择 GW30钢结硬质合金制造耐火砖成形模 ,优化制造工艺 ,制得的成形模的使用寿命比 Cr12、2 0 Cr钢提高 10~ 2 0倍 ,具有显著的技术经济和社会效益。 相似文献
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硬质材料和难熔金属气体分析进展 总被引:4,自引:2,他引:4
简要评述了我国硬质合金、难熔金属及其碳化物、氮化物中C、N、O、S、H分析方法和金属中气体分析仪器、气体标样研制工作及其取得的进展。 相似文献
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以高纯Nb和Si粉末为原料,通过机械球磨+真空热压烧结制备了高致密度的Nb-16Si难熔合金.利用SEM和XRD分析了球磨后复合粉末的形貌变化以及热压烧结后材料的显微组织和相组成.机械球磨后粉末颗粒获得细化,Si固溶于Nb形成间隙固溶体,烧结后材料由铌基固溶体(Nb_(ss)),Nb_5Si_3,Nb_3Si及少量高Si含量的铌基固溶体(Nb_(ssI))组成,平均晶粒尺寸约为2μm,呈等轴状.烧结材料呈现典型的穿晶断裂模式及韧性相增韧.测定了材料的Vickers硬度及各相的纳米硬度,利用单边切口直通梁法(SENB)测定其室温断裂韧性.利用烧结-锻造技术成形了Nb-16Si难熔合金推力室模拟件,其微观组织与热压烧结材料相似,力学性能较烧结材料有所降低,与金属间化合物的大小有关. 相似文献
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1 INTRODUCTIONDexingCopperMineinJiangxiProvince ,Chi na ,isalargecopperdepositatwhicharound 50 0mil liontonsofwasterockscontaining 0 .1%~ 0 .3%copperareproduced ,andapproximately 1.2milliontonsofmetalcoppercontainedintheselow gradeorescouldnotbeeconomicallyrecovere… 相似文献
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孟宇群 《中国有色金属学会会刊》2005,15(5):1178-1184
A new hydrometallurgical process for a carbonaceous refractory gold concentrate at ambient temperature and pressure was presented, including grinding-leaching, intensified alkaline leaching(IAL), thiosulfate leaching and cementation by zinc powder. The experimental results show that the grinding-leaching and intensified alkaline leaching process result in the selective oxidation of arsenopyrite and pyrite. The oxidation ratio of As is 96.6%, and 46.7 % for S. The total consumption of NaOH in alkaline leaching is only 28 % of that theoretically calculated under the conditions of full oxidization for the same amount of arsenopyrite and pyrite transforming into arsenates and sulfates, and 83.6% of gold is synchro-dissoluted by thiosulfate self-generated during pretreatment. Since the carbonaceous matter in concentrate possesses a strong capability of preg robbing, the cyanidation process is not suitable for the extraction of gold after pretreatment. However, the gold leaching rate by thiosulfate leaching for 24 h is increased to 91.7% from 0 - 3.2% by ultra-fine grinding without the pretreatment. The recovery of gold by zinc cementation gets to 99.6%. Due to the thiosulfate self-generated during alkaline leaching, the reagent addition in thiosulfate leaching afterwards is lower than the normal one. 相似文献
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晋东北各种类型金矿中都广泛发育热液型石英脉,与矿化有关的石英流体包裹体的特征反映了不同的矿床类型。对该区石英脉型、蚀变岩型及磁铁石英岩型金矿床的研究表明,石英中流体包裹体的成分、温度和红外吸收光谱等特征可以作为划分矿床类型和作为金矿找矿评价的标志 相似文献
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高砷难处理金精矿细菌氧化-氰化提金 总被引:1,自引:0,他引:1
通过在高砷金精矿中配入不同比例的低砷碳酸盐型金精矿,使其所含硫、砷及铁等主要矿物成分含量发生变化,研究给矿中铁砷摩尔比对难处理高砷金精矿细菌氧化一氰化浸出效果的影响.结果表明:含砷金精矿中铁砷摩尔比直接影响细菌预氧化的效果,同时也影响细菌的活性和溶液中铁砷摩尔比的变化,给矿中铁砷摩尔比越高,溶液中的铁砷摩尔比也越高,且随着给矿中铁砷摩尔比的增加,溶液中铁砷摩尔比的变化幅度加大,给矿中铁砷摩尔比介于4.6~2之间,有利于细菌预氧化和氰化浸出,铁、砷氧化率分别由6.14%和7.38%提高到89.90%和93.60%,金、银浸出率分别由64.18%和35.93%提高到97.78%和88.83%,较好地改善细菌氧化效果,稳定和优化细菌预氧化过程. 相似文献
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Zhao Bing Lu Lizhu Xie Huiqing Institute of Chemical Metallurgy Chinese Academy of Sciences Beijing 《中国有色金属学会会刊》1997,(4)
APPLICATIONOFCOALGOLDAGGLOMERATIONPROCESSTOGOLDRECOVERINGFROMAMALGAMATIONTAILINGS①ZhaoBing,LuLizhu,XieHuiqingInstituteofChemi... 相似文献