从湿法炼锌渣中回收银和硫

研究了用二甲苯浸出—焙烧—硫酸浸出杂质—氰化浸出银工艺从湿法炼锌渣中回收硫和银。试验结果表明:在反应温度95℃、反应时间15min、液固体积质量比5∶1条件下用二甲苯浸出,硫浸出率为96.40%;分硫渣中加入1%氢氧化钠,在630℃下焙烧2h,然后用硫酸浸出锌、铁等杂质,控制液固体积质量比为4∶1,pH为1.0,反应温度为95℃,反应时间为3h;之后对硫酸浸出渣氰化浸出银,体系pH控制在9.5~11.5之间,液固体积质量比为3∶1,氰化钠质量浓度2.0g/L,浸出时间24h,银回收率为78.5%。     

用钛白废酸和硫酸渣制备铁精粉

研究了用钛白废酸处理硫酸渣,降低硫酸渣中硫、砷等杂质含量,再经重选得到铁精粉,考察了废酸浓度、液固体积质量比、反应时间等对硫酸渣脱硫脱砷的影响。结果表明:在废酸质量浓度120 g/L、液固体积质量比2.5、温度30℃条件下搅拌3 h,硫酸渣中铁质量分数达57.02%,硫、砷质量分数分别降至0.45%和0.05%;进一步重选得到铁质量分数62.5%的铁精粉。处理过程中产生的废水用电石渣中和后可循环使用,实现了"以废治废"。     

硫酸渣的化学法富铁降硫

研究了对贵州瓮福集团的硫酸渣采用化学法富铁降硫。试验结果表明:随王水体积分数、液固体积质量比、反应温度和反应时间增加,处理后的渣中铁得到富集,硫质量分数有所下降;在适宜条件(液固体积质量比6∶1,王水体积分数5%,温度40℃,反应时间2h)下,处理后的渣中铁质量分数约为55%,硫质量分数约为0.7%,富铁降硫效果较好。     

金属硫化矿的微生物脱硫及优化试验研究

利用微生物脱硫可以将硫化矿表面的硫含量降低。通过金属硫化矿微生物脱硫摇瓶试验,考察了溶液pH、细菌接种量、矿浆浓度和初始Fe2+质量浓度对脱硫的影响,并对溶液电位(E)及脱硫率进行了回归分析。结果表明,溶液pH对脱硫影响最大,接种量影响最小。优化的微生物脱硫条件为:pH=1.5,矿浆浓度5%,初始Fe2+质量浓度0,细菌接种量10%。优化条件下,溶液电位(E)最大期望值为804mV,脱硫率最大期望值22.7%。     

用硫氰酸盐从硫酸烧渣中浸出金银试验研究

研究了用硫氰酸盐从吸收二氧化硫废气后的硫酸烧渣中浸出金银,考察了硫氰酸盐用量、体系pH、液固体积质量比、浸出时间对金、银浸出率的影响。试验结果表明,在烧渣质量100g、硫氰酸钠10g、体系pH=2、液固体积质量比2∶1、常温下搅拌浸出4h条件下,金浸出率为82.6%,银浸出率为62.4%,浸出效果较好。     

铜冶炼提铜尾渣脱硫技术研究

阐述了铜冶炼提铜尾渣作为冶炼烟气脱硫剂的反应机理,并进一步阐述pH、烟气流速、矿浆浓度对烟气脱硫的影响。试验表明,提铜尾渣具有很强的脱除SO_2的能力,最佳试验参数为pH=1、固液比1∶3、烟气流速在400mL/min以下,脱硫效率可提高至95%左右。     

微波辅助二甲苯脱除湿法炼锌渣中的硫

研究了在微波辅助条件下用二甲苯脱除湿法炼锌渣中的硫。结果表明:在液固体积质量比6∶1、高火力、加热时间10min、无搅拌条件下,脱硫率达98.12%,单位时间、单位能耗下的脱硫率为1.115×10-4g/(mL·℃·min);微波辅助二甲苯脱硫可降低液固体积质量比,提高脱硫率,降低生产成本;反应不受扩散控制。     

用碳酸盐从废铅酸蓄电池铅膏中脱硫试验研究

分别以碳酸铵和碳酸氢铵作脱硫剂对废铅酸蓄电池铅膏脱硫工艺进行了研究,考察了反应时间、反应温度、脱硫剂与硫酸铅物质的量比、液固体积质量比等参数对脱硫率的影响,确定了最佳工艺条件。研究结果表明:以碳酸铵作脱硫剂时,在反应时间60min、反应温度50℃、反应物物质的量比1.2/1、液固体积质量比5/1条件下,脱硫率达95.22%;以碳酸氢铵作脱硫剂时,在反应时间70min、反应温度60℃、反应物物质的量比1.6/1、液固体积质量比5/1条件下,脱硫率达90.46%。     

用钛白废酸从硫酸渣中浸出铜

研究了用钛白废酸从硫酸渣中浸出铜,再用硫化钠从浸出液中沉淀铜,考察了废酸质量浓度、液固体积质量比、搅拌时间对铜浸出率的影响。结果表明:在废酸质量浓度123 g/L、液固体积质量比3/1、温度30℃条件下搅拌浸出3 h,铜浸出率达82.1%;浸出矿浆用石灰乳中和至pH=4.0,液固分离后用硫化钠沉淀铜,铜回收率为81.45%,沉淀物中铜质量分数为34.5%;沉铜后的废水用石灰中和后循环使用。此工艺可实现以废治废,回收有价金属。     

钙化提钒尾渣碳酸氢铵脱硫及酸浸提钒工艺研究

针对钙化提钒尾渣难以实现有效提钒利用的现状，提出采用碳酸氢铵脱硫-酸性浸出的工艺对钙化提钒尾渣进行处理。研究了脱硫过程中反应温度、碳酸氢铵加入量、液固比对脱硫效果的影响；酸浸过程中温度、pH、液固比对提钒效果的影响，并采用曲面响应的研究手段进行了条件优化，获得了最佳反应参数。结果表明：在脱硫反应温度为30℃，碳酸氢铵用量与脱硫理论值之比为1.4∶1，脱硫液固比（L∶S）=5∶1时，脱硫率为94.58%；在酸浸温度30℃，酸浸液固比L∶S=6∶1，酸浸pH=1.0的条件下，尾渣钒的浸出率为56.79%。通过曲面响应试验得到了最佳工艺参数：浸出pH为0.977，浸出温度为39.36℃，液固比4.455∶1。在该条件下，钒的浸出率的预测值为56.80%，验证性试验浸出率为56.77%，比预测值仅低0.03个百分点。研究结果表明该工艺操作简单，脱硫率高，提钒效果较好，有利于钙化提钒尾渣的有效利用，具有良好的发展前景。     

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。     

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.