液态高铅渣直接还原试验研究

以豫光氧气底吹炉所产高铅渣为原料,配入碳质还原剂,在高温熔融态下还原高铅渣中的铅,并对还原过程进行了系统研究。结果表明,最佳还原条件为:还原温度1 150℃、还原时间1 h、还原剂率3.5%。在上述条件下,高铅渣还原进行得较彻底,渣含铅可降到3%左右。     

铅精矿与富铅渣交互反应的还原熔炼试验研究

在实验室高温电炉条件下,采用铅精矿和富铅渣之间的交互反应对熔池熔炼还原段进行了研究。分别考察了反应温度、反应时间、渣型选择、配料比等对炼铅各主要技术经济指标的影响。在最优条件下:终渣含铅2.61%,铅的回收率(以渣计)98.21%,脱硫率91.5%,烟气烟尘率33.63%,粗铅产率22.76%,渣产率43.61%。     

锌冶炼铅银渣湿法浸出工艺研究

在分析湿法炼锌铅银渣的主要成分与化学物相的基础上,考察了温度、浸出时间、氯酸钠浓度、酸度等对铅银渣中铅银含量及浸出率的影响,确定了氯化浸出最优工艺条件为:氯化钠浓度300g/L、氯化钙浓度50g/L、初始盐酸0.4mol/L、浸出温度85℃、浸出时间2.5h、液固比8,在该条件下铅银渣中铅、银的浸出率分别可达94.43%和91.48%,渣中铅含量为0.9%,银含量84.4g/t。     

锌冶炼渣搭配铅精矿侧吹还原熔炼直接炼铅渣型理论研究

以FeO-Fe_2O_3-SiO_2-CaO-ZnO-PbO渣系为研究对象,采用热力学软件FactSage计算温度、Fe/SiO_2(质量比)、CaO/SiO_2(质量比)、ZnO含量及PbO含量等因素对炉渣熔化温度及液相生成区的影响。热力学分析表明,随着Fe/SiO_2的增大,炉渣熔化温度减小,随着CaO/SiO_2的提升呈先减小后增大的趋势。炉渣中ZnO含量在10%～18%变化时,炉渣的熔化温度变化较大。随着ZnO含量的增加,炉渣的液相区有所减小,当渣中ZnO含量低于12%时,可保证还原熔炼的顺利进行。验证试验表明,在熔炼温度1 200～1 250℃、CaO/SiO_2=0.5、Fe/SiO_2=0.9、ZnO含量12%的条件下,采用侧吹还原熔炼处理液态高铅渣可顺利进行,熔炼过程金属直收率为85%,渣中铅含量为2.06%。     

铅冶炼物料工艺矿物学与热力学平衡研究

富氧熔池熔炼-液态高铅渣直接还原工艺因对原料适应性强、熔炼炉运行稳定可靠、金属回收率高及氧化炉熔炼烟气中二氧化硫浓度高,在铅冶炼工业中占有越来越重要的地位。但目前对于该工艺的理论基础研究较为薄弱,亟需对该工艺冶炼过程热力学平衡等进行理论研究,为工艺的优化提供理论支持。首先对冶金过程物料如铅精矿、高铅渣及还原渣进行了工艺矿物学研究,然后通过FactSage8.1热力学软件计算,研究了氧化段氧气系数、熔炼温度及还原段还原剂用量对体系中Pb分配率和熔炼渣中Pb、S等元素含量的影响规律。计算得出,铅富氧熔池氧化熔炼中铅的直收率在氧气系数1.0、熔炼温度1 200℃左右时达到最高;温度的升高与FeO、CaO的加入有利于高铅渣还原反应的进行,在还原剂用量大于5.7%时铅的还原率达到91%。     

顶吹烟化法在回收铟中的应用

顶吹烟化是一种在炼铅炉渣中有效回收铟的方法。通过热力学计算阐明了铅渣中铟的还原性与挥发性;同时,试验研究了还原温度和时间等因素对铅锌还原挥发率的影响。研究指出,温度、时间和炉渣中原始含锌量对烟化挥发铟有影响。结果表明,在煤的配入量为炉渣质量的50%、还原温度为l 250℃、时间为60 min的条件下,锌的挥发率高于83.67%,铟的挥发率高于60.67%,铅的挥发率高于92.14%。当原铅渣中锌含量达到8%时,铟挥发率可达90.27%。     

含铅锌渣中铅的富集

提出低酸—高酸两段逆流浸出含铅锌渣新工艺,低酸浸出考察液固比、时间和温度对锌浸出率的影响,高酸浸出考察初始硫酸浓度、时间和温度对锌浸出率及铅品位的影响。结果表明,在低酸浸出,液固比6∶1、时间5h、温度60℃;高酸浸出,初始硫酸浓度170g/L、时间6h、温度95℃的最优条件下,锌浸出率99.29%,铅入渣率98.58%,高浸渣中铅品位62.25%。     

锑精炼除铅渣硝酸浸出回收铅的研究

采用硝酸浸出的方法从锑精炼除铅渣中回收金属铅,考察了液固比、浸出温度和时间、硝酸浓度等对铅浸出率的影响。结果表明,适宜的浸出工艺为:液固比4、浸出温度80℃、浸出时间50min、硝酸浓度7.0mol/L。在此条件下,铅浸出率可以达到94%。     

高铅渣还原过程渣性能及其还原特性的热力学分析

液态高铅渣的还原过程中炉渣物理化学性能变化对其还原特性至关重要。本文在分析高铅渣的主要物化性能指标及其研究方法及分析检测手段基础上,对目前铅渣物理化学性能及还原特性的研究现状进行了概述。并运用热力学软件分析计算了高铅渣还原过程的热力学特性,结果表明,在高铅渣还原反应中,从热力学角度,渣系的所有物相中,无论是和C反应还是和C0反应,Pb_8ZnSi_6O_(21)都是最容易被还原的。在温度700℃条件下,Pb_8ZnSi_6O_(21)和Pb_4SiO_6与C直接还原反应比与C0还原反应更容易进行,但是对Pb_2SiO_4和Pb0没有明显的趋势。     

锌冶炼铅银渣还原焙烧挥发铅锌试验研究

研究了铅银渣还原焙烧挥发铅、锌,考察了升温制度、焙烧温度、焙烧时间、焦粉用量、添加剂用量等对铅锌挥发率的影响。结果表明:在1 200℃下恒温焙烧60 min,控制焦粉用量40%、添加剂氧化钙用量4%,铅、锌挥发率分别高达98.85%和97.6%,挥发效果较好。     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

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.