焙烧氰化尾渣有价金属回收试验研究

辽宁新都黄金有限责任公司焙烧氰化尾渣中具有回收价值的有价组分主要为金、银、铜、铅、锌等。针对其尾渣性质,采用氯化焙烧工艺进行有价金属回收试验研究。结果表明:在氯化钙添加量7%、氯化焙烧温度1 100℃、时间1.5 h的工艺条件下,有价金属Au、Ag、Cu、Pb、Zn的挥发率分别达到92.25%、75.81%、82.66%、99.31%、91.06%。通过梯度升温干燥等措施,可以有效提高干球团强度。     

山东某焙烧氰化尾渣综合回收工艺研究

针对山东某焙烧氰化尾渣的性质,采用高温氯化焙烧工艺对其进行了综合回收试验研究。结果表明:在氯化钙添加量7%、焙烧温度1 100℃、焙烧时间2 h的工艺条件下,有价金属Au、Ag、Cu、Pb、Zn的挥发率分别达到97.52%、71.78%、85.92%、98.59%、93.81%,指标较好。同时,根据试验结果提出了尾渣综合回收有价金属的工艺流程,为后续研究奠定了基础。     

焙烧氰化尾渣回收金银研究

研究从青海滩涧山氰化尾渣回收金银的过程。结果表明,采用焙烧、加煤焙烧、中温氯化焙烧、硫酸预处理工艺效果均不理想,而采用高温氯化法时金银回收效果良好。在氯化钙添加量5%、焙烧温度1 200℃、焙烧时间1 h时、金挥发率达到89.57%,银挥发率53.46%,同时,铁基本不挥发,砷有少量挥发。     

从提金渣中回收金银的研究

采用高温氯化工艺对新疆某提金渣进行提取金、银等有价元素的研究。结果表明:在干式混料,粉状焙烧,氯化挥发温度1 000℃,氯化时间30 min,CaCl2用量5%的条件下,金、银挥发率分别为95.19%和59.26%。     

焙烧氰化尾渣中氧化铁的磁化焙烧研究

对金精矿焙烧氰化浸金工艺产生的尾渣用煤粉作还原剂进行了磁化焙烧研究,通过对尾渣中铁的物相分析表明,尾渣中的铁主要以Fe2O3的形态存在。主要研究了煤粉的加入量、焙烧温度和焙烧时间对尾渣中铁的还原度的影响。结果表明,以煤为原料通过磁化焙烧可以获得Fe3O4,磁化焙烧的较优条件为焙烧温度750℃,焙烧时间1 h,煤粉用量为尾矿重量的10%,可以使焙烧处理的尾矿中Fe2O3的还原度达到51.7%,磁化焙烧后渣中的磁性矿中铁达到72.75%。     

焙烧氰化尾渣回收有价金属试验

研究采用高温氯化工艺回收焙烧氰化尾渣中的有价金属。结果表明,在氯化钙添加量7%、1 100℃焙烧2h的条件下,Au、Ag、Cu、Pb、Zn的挥发率分别达到97.52%、71.78%、85.92%、98.59%、93.81%。球团采用梯级烘干的干燥工艺,经40min干燥后,干球团落下强度10次/0.5m,抗压强度90%100N,基本符合回转窑进料的强度要求。     

氰化尾渣中金的回收试验研究

某黄金矿山生物氧化-氰化炭浸工艺产生的氰化尾渣中金品位较高,为2. 40~3. 60 g/t。试验考察了焙烧氧化-氰化浸出工艺回收金的可行性。结果表明:在焙烧温度500℃、弱氧化气氛下焙烧120 min,获得的焙砂在氧化钙用量15 kg/t、矿浆浓度33%、氰化钠用量1. 0 kg/t、浸出时间24 h条件下进行氰化浸出,浸渣产率为88. 80%,金浸出率在94. 92%以上;采用焙烧氧化-氰化浸出工艺回收氰化尾渣中的金是可行的。该研究为氰化尾渣中金的回收利用提供数据参考。     

焙烧氰化渣氯化挥发提金的研究

对山东某焙烧氰化渣进行了氯化挥发提金的研究,将原料配入CaCl₂造球、烘干,将球团在不同条件下焙烧,分析焙烧前后的元素含量变化。结果表明：氰化渣中配入4%的CaCl₂造球烘干,在1 050 ℃下焙烧,金挥发率能达到85.93%,且在该温度下未发生熔融,证明使用氯化挥发法提取焙烧氰化渣中的金是可行的。实验中还发现,CaCl₂的分解温度远低于适宜的挥发温度,因此升温时间、中温停留时间过长会导致CaCl₂提前分解,影响金的挥发。     

某高砷难处理金精矿回收有价元素试验

采用两段焙烧—酸浸—氰化浸出工艺从某高砷难处理金精矿中回收有价金属。结果表明,一段焙烧温度550℃,二段焙烧温度630℃,酸浸时间90min,控制终点pH 1.0时,铜浸出率达到82.44%;酸浸渣细磨至-0.039mm占88.9%,氰化钠用量6kg/t,氰化浸出48h,金浸出率达到90.98%。     

氰化尾渣高温氯化焙烧制备陶粒

以氰化尾渣为主要原料,配以膨润土、钠长石、CaCl2、煤粉等辅料,利用高温氯化焙烧方法制备了陶粒。采用XRD、SEM、XRF、TG/DTA、ICP-OES等研究了氰化尾渣的物相成分、微观结构等理化性能,测定了陶粒成品的吸水率、堆积密度、重金属挥发率等,并对烧成效果最好的陶粒成品进行了微观结构分析。结果表明,氰化尾渣利用率最高能达到75%,得到的焙烧陶粒1h吸水率为9.45%、堆积密度为642.93kg/m3,Au、Ag、Cu、Pb、Zn等金属挥发率分别达到83.02%、65.31%、75.89%、90.65%、85.34%。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

正~~     

Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

正~~     

China's Major Non-ferrous Metals Imports & Exports

正~~