含砷硫酸铵溶液深度脱砷工艺研究

针对氨酸法处理烟化炉含硫烟气制备硫酸铵经常出现砷含量超标的问题,提出用改性纳米铁深度脱出硫酸铵溶液中的砷,研究了温度、搅拌速率、反应时间、纳米铁用量多砷脱出率的影响,在小试的基础上开展了扩大实验和除砷后液除铁实验。研究结果表明,改性纳米铁脱砷较优工艺为：温度为20℃,搅拌转速为200r/min,反应时间为60min,纳米铁用量为1.5mL/L。在该条件下,硫酸铵砷含量可以降到0.0002%。扩大实验硫酸铵砷含量可降至0.0001%,加入双氧水反应0.5小时后,硫酸铵Fe含量由0.0018%降低至0.0001%。硫酸铵含砷优于GB/T 535-2020《肥料级硫酸铵》标准。     

金铜冶炼高砷烟尘酸浸液铜砷分离回收工艺研究

针对高砷白烟尘酸浸液中的铜砷分离回收进行了工艺研究,采用沉铜法分离铜,沉铜液用二氧化硫还原结晶。试验结果表明:在85℃以上加入沉铜剂反应2h可实现铜的分离,铜的回收率达98%以上,沉铜液中的砷通入二氧化硫还原,结晶温度为20℃时,砷的回收率70%左右。该工艺为高砷烟尘酸漫液中的铜砷分离及回收提供了较为可靠的处理思路。     

铜渣辅助铁粉去除含铜砷酸性溶液中铜、砷的试验

湿法炼锌过程中,常采用铁粉置换法去除含铜砷酸性溶液中的铜、砷,但该方法要求溶液中n_Cu∶n_As≥3∶1才能保证As的彻底沉降。正常生产的含铜砷酸性溶液中n_Cu∶n_As≤3∶1,As沉降不彻底,容易产生砷化氢有毒有害气体。某冶炼企业在锌冶炼过程中产出含铜55%～60%的副产品铜渣,提出在铁粉置换工序中加入铜渣,并进行了试验验证。结果表明,在原料为该企业含铜砷酸性溶液前提下,当铁粉过量系数1.5倍时,不加入铜渣,铜砷去除率仅57.14%、26.73%;加入2 g/L铜渣,则铜砷去除率可达92.35%、89.85%;在较佳工艺参数反应时间1 h、温度80℃左右、铜渣添加量2 g/L、铁粉过量系数1.5倍条件下,除铜、砷率均可达到90%以上。该方法可减少铁粉消耗量、降低生产成本,为锌冶炼企业处理含铜砷酸性溶液提供了参考。     

含砷含铁冶金废水Fenton氧化脱砷处理

采用Fenton预氧化-中和脱砷法对含砷含铁冶金废水进行净化处理,通过单因素试验分别研究了Fenton氧化剂用量、氧化时间对铁氧化率的影响,以及中和脱砷过程药剂用量、反应时间、搅拌速度和反应温度对脱砷效果的影响,并对最优条件的脱砷后液和中和渣与企业工艺参数进行对比。结果表明：向废水中加入5 mL/L过氧化氢(30%)预氧化5 min后,废水中Fe²⁺浓度从2.23 g/L降至0.01 g/L,Fe²⁺氧化率为99.55%。最优脱砷条件为：石灰加入量15 g/L、搅拌速率300 r/min、温度30℃、反应时间50 min,脱砷率为99.9%。中和渣毒性浸出试验结果为0.32 mg/L,满足危险废物浸出毒性鉴别标准(GB 5085.3—2007),实现砷无害化处理。     

从布袋灰中提取有价金属的新工艺研究

研究了从布袋灰中提取有价金属的新工艺。采用碳酸钠焙烧—水洗法从布袋灰中除砷,考察了碳酸钠用量、焙烧温度、焙烧时间对除砷率的影响。结果表明,在25g碳酸钠/50g布袋灰、600℃焙烧2h的条件下得到的焙砂经水洗后,水洗渣含砷仅为0.15%,除砷率可达99.85%,此时锌、铜的损失率仅为0.5%。除砷水洗渣提取有价金属的最佳浸出条件为:硫酸浓度1.23mol/L、浸出温度90℃、浸出时间1.5h,在此条件下锌浸出率达98.53%,铜浸出率达97.65%。浸出液中的锌、铜可采用加入过量氢氧化钠的方法得到分离,浸出渣中的铅、锡可加入碳进行还原熔炼得到铅锡合金。     

含砷氢氧化钠溶液综合回收技术研究

在含砷氢氧化钠溶液中加入氧化剂,35℃~60℃反应后,有效分离其中的锑;再加入石灰乳,常温下反应,将其中的碳酸盐、硫酸盐等除去,并且除去其中0%以上的砷;在加热至0℃~100℃,加入相当于砷重量30~50倍的脱砷剂,反应后冷却,静置,过滤,又能将其中的砷除去%以上;再加入硫酸铁,室温下反应,冷却,澄清,得净化的氢氧化钠溶液,其氢氧化钠含量为60g/L~100g/L,砷含量1.0mg/L。将净化后的氢氧化钠溶液浓缩为氢氧化钠含量2%~6%的固体氢氧化钠,砷含量≤0.05%。该技术流程短,操作简单,实现了对含砷1g/L~5g/L的氢氧化钠溶液的净化提纯和再利用。     

从浮渣铅精矿熔炼产的合金中回收金银的试验研究

针对某冶炼厂采用铜浮渣苏打-铅精矿熔炼法产砷铜铅合金的特点,提出合金苏打-铅精矿熔炼法.试验结果表明:当铅精矿相对合金加入比率为230%时,铅直收率93.36%,金和银直收率分别为91.02%和69.38%,铜在冰铜中的直收率为98%以上.     

双氧水处理-连续滴定法测定铜电解液砷锑

为解决铜电解液中砷锑铋之间复杂化学反应所引起的砷锑分析误差大的问题,在含砷锑矿石的砷锑连续滴定方法基础上,模拟了铜电解液中砷锑的存在环境,开发出适合于铜电解液砷锑测定的双氧水预处理 连续滴定法。首先采用适量双氧水消除As,Sb对砷锑分析结果的影响,再依次加入硫酸和硫酸肼两次冒浓烟至瓶颈,冷却后于盐酸介质中,以次甲基兰 甲基橙为指示剂,先用硫酸铈标准溶液滴定Sb,再用溴酸钾标准溶液滴定As。实验表明,连续滴定法中,适宜的硫酸加入量为20 mL,发烟时间为5 min,滴定锑时的盐酸浓度为43 mol/L,温度为70 ℃,滴定砷时的盐酸浓度为18 mol/L,温度为80 ℃。采用本方法分析合成铜电解液,砷、锑的回收率分别为96 %和104 %。采用该方法分析铜电解生产线上铜电解液,测得结果与原子吸收光谱法吻合,相对标准偏差（n=6）小于12%。     

氧化酸浸脱砷及稳定化固砷研究

采用氧化酸浸法对高砷冶金废渣进行处理,确定了最佳脱砷工艺。结果表明,在硫酸浓度1mol/L、液固比4∶1、20℃反应4h时,滤渣中砷残留量降低到1%以内。向高砷浸出液中加入还原铁粉进行预处理,并用二价铁氧气氧化法合成晶型良好的砷酸铁固砷材料,经毒性浸出试验检测,完全满足SPLP毒性浸出试验要求,可安全处置。     

氢化物发生-原子荧光光谱法测定精碲中微量砷

提出了一种氢化物发生-原子荧光光谱法测定精碲中微量砷的方法。用硝酸溶解样品,氢氧化钾和盐酸调节溶液酸度至pH 5.5~6.5,碲水解沉淀析出。除去了大量基体后,溶液中碲量少于50μg/mL。在盐酸介质中用硫脲-抗坏血酸将砷(预还原为砷(Ⅲ),以标准加入法绘制校准曲线,氢化物发生-原子荧光光谱法测定砷量。方法的检出限为0.02μg/L,砷量在0.02~40μg/L范围内有良好的线性关系。方法操作简便、快速,应用于精碲中痕量砷的测定,测定结果与正戊醇萃取砷钼蓝分光光度法的结果相符,相对标准偏差为4.2%~8.5%,样品的加标回收率在93%~104%之间。     

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.