基夫赛特炉搭配沉铁渣炼铅的热力学分析与试验研究

对基夫赛特炉搭配沉铁渣炼铅的反应过程进行了热力学分析,结果表明:在500~1 000℃条件下,PbS氧化生成PbSO_4比生成PbO的趋势更强,ZnS氧化生成ZnSO_4比生成ZnO的趋势更强。在800~1 300℃条件下,PbSO_4较PbO更容易被还原成单质铅。试验研究结果表明:在1 000℃条件下,PbS主要氧化成PbSO_4。在温度1200℃,M_(氧化后铝精矿)/M_(氧化后沉铁渣)=4:1,CaO/SiO_2=0.5,Fe_2O_3/SiO_2=1.25,M_(待还原料)/M_(焦炭)=40.2的还原气氛下,产出粗铅的品位达到97.48%,铅的回收率为98.35%。     

沉铁渣回收利用中的脱硫试验研究

模拟"熔池熔炼法从沉铁渣中回收铁"工艺的高温氧化脱硫阶段,考察了温度、气氛和冷却方式对沉铁渣脱硫程度及铁富集效果的影响。硫酸铁分解脱硫的热力学计算与热分析表明,硫酸铁分解脱硫的温度分别为780.0℃和875.2℃,热力学计算得到的相变温度、分解温度与热分析曲线的吸热峰位置、失重阶段相吻合。沉铁渣脱硫阶段的最佳工艺条件为:炉膛温度1 300℃,氧气气氛,水淬法冷却产物。此时沉铁渣的脱硫率为99.55%,铁在产物中的含量为37.92%。     

钙铁渣在处理电子废料中的生产实践

介绍了NRTS炉处理电子废料工艺,阐述了NRTS炉处理电子废料的生产实践以及钙铁渣的应用情况,研究了CaO含量对渣含铜的影响。结果表明,在生产实践中,炉温控制在1 300℃、Fe不低于30%、Fe/SiO2=1.3~1.5的情况下,渣含铜随着CaO含量先减小后增大,CaO含量控制在6%~8%较适宜,此时渣含铜低于1%。     

钙铁渣在处理电子废料中的生产实践

介绍了NRTS炉处理电子废料工艺,阐述了NRTS炉处理电子废料的生产实践以及钙铁渣的应用情况,研究了CaO含量对渣含铜的影响。结果表明,在生产实践中,炉温控制在1 300℃、Fe不低于30%、Fe/SiO2=1.3~1.5的情况下,渣含铜随着CaO含量先减小后增大,CaO含量控制在6%~8%较适宜,此时渣含铜低于1%。     

高温挥发法从沉铁渣中回收锌的试验研究

研究了采用高温挥发法从沉铁渣中回收锌,考察了焦铁比、温度、时间对锌挥发率的影响。结果表明:在温度1 230℃、焦铁比50%、时间30 min条件下,沉铁渣中锌的回收率达97.9%。高温挥发法工艺简单,锌回收率高,具有一定的应用前景。     

湿法炼锌铅银渣烟化挥发热力学研究

通过热力学计算,得出湿法炼锌铅银渣烟化挥发过程中ZnO、FeO、PbO、Fe2O3还原挥发所需的PCO/PCO2值,并对影响烟化挥发的空气过剩系数α值、渣型等因素进行了初步研究.结果表明:熔炼初期α宜控制在0.8～1.0,还原阶段宜控制在0.6～0.7,此条件能较好地满足烟化挥发过程中热量和还原性气氛的要求.对FeO-SiO2-CaO三元系热力学研究表明,选择CaO 10％～20％、FeO 40％～55％、SiO2 30％～35％的渣型,渣熔化温度小于1 150℃,黏度在0.5～5 Ps·s范围内.     

用钙化焙烧—酸浸法从钒铁渣中提取钒试验研究

研究了采用钙化焙烧—酸浸工艺从钒铁渣中提取钒,通过条件试验考察了几个因素对钒提取效果的影响。试验结果表明:采用钙化焙烧—酸浸工艺,在铁钒渣造球粒径8~10mm、氧化钙用量为钒铁渣质量的14%、硫酸质量浓度120g/L、焙烧温度900℃、浸出时间4h、液固体积质量比2∶1、浸出温度95℃条件下,钒浸出率在95%以上,工艺操作简单,有一定经济效益。     

用针铁矿法从锌矿石浸出液中除铁试验研究

研究了用针铁矿法从锌矿石浸出液中除铁。试验结果表明,采用30%的双氧水作氧化剂,在温度95℃、溶液pH 4.8、双氧水用量16.67 mL/L、沉铁渣用量16.72g/L条件下反应5h,陈化2h,除铁率达99.99%。该工艺除铁效果较好,除铁后液符合工业要求。     

降低钴浸出液中铁杂质含量研究

某钴冶炼厂采用中和水解法除铁,在除铁过程中,存在除铁率低、铁渣中夹钴率高(达到14%)等问题。对此,采用中和水解法来降低除铜后钴浸出液中铁含量,对影响除铁的参数进行多因素试验。结果表明,在氧化还原电位0.40V、终点pH在4.00~4.25、除铁时间控制在6.5h以上、空气流量大于0.8倍溶液/min,除铁温度在50℃以上时,除铁率达到99%,钴夹带率降低到≤1%。     

LF精炼渣碳酸化过程Ca赋存状态转变

为提高LF精炼渣资源化利用效率,对精炼渣碳酸化过程中Ca赋存状态转变进行了研究。通过碳酸化实验确定了温度为20℃,液固比为5,通气量为600 mL/min,转速为700 rad/min,粒径小于88μm时碳酸化效果最好,并探究了不同pH条件下Ca^2+、HCO3^-、CO3^2-的浓度变化。在此基础上,利用XRD、SEM、TG-DTA、FT-IR等方法对碳酸化前后精炼渣进行了表征分析。XRD分析表明,f-CaO、Ca2SiO4、Ca3Al2(SiO4)3衍射峰强度减弱,碳酸化后主要产物为CaCO3;DG-DTA分析表明,碳酸化产物在600~800℃失重率达13.35%;SEM分析表明,生成的CaCO3颗粒聚集附着在精炼渣颗粒表面;FT-IR表明,碳酸化后产生大量碳酸盐,并多为方解石晶型。     

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.