浸锌渣-煤泥-CaO冷固结球团的制备及还原性能研究

浸锌渣、煤泥均为微细粒二次固体资源。在煤泥、浸锌渣性能研究基础上,以煤泥为还原剂、CaO为粘结剂制备浸锌渣-煤泥-CaO冷固结球团,并对该球团的还原性能进行研究,以比较浸锌渣、煤泥、CaO配合料冷固结球团前后铅、锌、铁的还原效果。结果表明:在浸锌渣、煤泥、CaO质量比为100:45:10,成球水分18%、水成球压力20 MPa所得生球,其抗压强度、落下强度和爆裂温度分别为160.1 N、4.2次和580℃。生球团200℃干燥60 min所得冷固结球团的抗压强度、落下强度分别为310.4 N和6.4次。冷固结球团经1 250℃还原90 min可获得的铅、锌挥发率和铁金属化率分别为98.66%、98.87%和97.78%,其直接还原效果较非球团直接还原好。     

硫铁矿烧渣氯化焙烧扩大试验

采用氯化焙烧工艺从硫铁矿烧渣球团中综合回收金、银、铜等有价金属,考察了造球、窑温、停留时间对金属挥发率以及物料和金属平衡的影响。结果表明,物料在1 250℃停留1.83h的最佳条件下,各金属挥发率为:Au 95.6%、Ag 52.5%、Cu 73.1%、Pb 93.9%、Zn 75.2%。球团中铜、铅、锌含量均小于0.1%,球团强度4.0⁶.5kN。     

酸洗—还原浸出法从镍钴净化渣料中回收镍钴

采用酸洗—还原酸浸工艺回收某冶炼厂净化渣中的镍钴。重点讨论了酸洗终点pH和还原浸出过程中酸浓度、温度及时间、终点pH、液固比、还原剂用量对镍钴浸出率的影响。结果表明,酸洗在终点pH=2.5的条件下,镍的浸出率为78.1%,而钴的浸出率极低。当还原酸浸出工艺在液固比10:1、酸浓度1.5mol/L、时间3.0h、温度60℃、还原剂用量1.0 mL/g的条件下,镍和钴的浸出率分别达到98.3%和97.5%。     

湿法炼锌渣中回收锌铟的研究

从含铟锌精矿中提取锌、铟常用的两种生产工艺都有工艺流程长,铟回收率低的缺点,为此进行了工艺流程改进的研究：原料经中性浸出后,在中性浸出渣中配入还原剂,经制团、干燥、高温还原挥发,铟、锌富集于挥发物中再进行回收。最佳试验条件：还原剂15％～20％,还原温度l250℃,进料量5kg／h：在此条件下,铟挥发率97％,锌挥发率95％,挥发物酸浸结果表明,锌浸出率98．53％,铟浸出率93．38％,锌铟总回收率得到极大的提高。     

还原挥发法从低品位含锗煤灰中提取锗

以褐煤经过一次挥发焙烧后获得的煤灰为原料、碳作为发热剂和还原剂,采用还原焙烧法富集其中的锗,考察煤灰和球团粒度、焙烧温度和时间、还原气氛等对锗挥发率的影响。结果表明,在一定范围内,还原气氛越强,锗的挥发率越高;煤灰和球团粒度对锗挥发率的影响较小;在不需额外补充气体和活性炭的条件下,在1000℃焙烧2h可使锗挥发率达到99.33%以上。     

含锌尘泥中锌铅及碱金属脱除研究

文章考察了不同碳氧比和温度条件下,直接还原过程中的铁还原率、金属化率、还原脱锌和脱铅率、KCl和Na Cl挥发脱除率。通过实验可知,含锌粉尘制备的含碳球团可以脱除锌、铅、钾和钠,同时有效利用粉尘中的碳资源还原铁氧化物得到金属化球团;在1200～1330℃范围内,温度对铁氧化物还原,锌和铅的还原脱除,KCl和Na Cl的挥发脱除影响明显;当粉尘碳氧比为1. 0,还原温度为1300℃,还原时间大于18min时,反应接近最终平衡点,可获得金属化率大于80%,锌铅几乎完全脱除,钾钠脱除率大于90%的金属化球团。     

转炉尘泥球团化渣剂实验研究及分析

阐述了实验室实验中,压力、水分、球团尺寸对压团的影响以及预热时间、焙烧温度对球团化渣剂焙烧固结的影响.结果表明,适宜的工艺参数为:压团压力在50kN左右,团块尺寸约φ30mm,压团原料水分为8%～12%;预热温度550～650℃,预热时间约25min;焙烧温度900～1000℃,焙烧时间约30min.     

镍钴富集物经电炉还原制备出的粗镍电解净化工艺研究

对镍钴富集物采用电炉还原制备出的粗镍开展了电解净化工艺扩大试验。结果表明,阴极电流效率达98.5%,粗镍阳极溶解的电流效率达85%,获得的电镍产品物理状态良好,表面光滑,化学成分达到Ni 9999电镍国家标准。粗镍阳极电解的槽电压为1.8~2.2 V,电流密度为220 A/m2,电耗为吨镍1 850 kWh左右。经过中和除铁、硫化除铜、氯气除钴、离子交换除锌处理后的阳极液可直接返回到粗镍电解作为阴极液使用。     

半焦制备活性炭的新工艺

摘要：基于煤基直接还原过程,以半焦为原料,利用铁矿预热氧化球团还原产生的气体为活化剂,开发一步法炭化、活化制备高性能活性炭新工艺,并通过优化制备温度、制备时间及还原剂用量等工艺参数,可同时得到优质还原球团。结果表明：在制备温度850℃、时间1h,半焦/球团的质量比为1∶1～4∶1的条件下,活性炭产率大于67%,耐磨强度达90%以上,比表面积和碘吸附值分别高于330m2/g、500mg/g,远优于商品活性炭,同时可得到金属化率为85%以上的预还原球团。     

温度对红土矿球团直接还原的影响

在还原时间90min、氧化钙配比10%、复合剂配比11%、还原碳配比5%的条件下制成球团进行焙烧、磁选。考察球团还原过程温度的变化对球团产生镍铁颗粒金属化率和镍品位的影响。结果表明:还原的最佳温度1 200～1 250℃,此温度下镍的金属化率达到89%以上、铁的金属化率85%以上。镍的品位达到5%。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.