含砷酸性废水除砷工艺现状与展望

综述了当前含砷废水主要处理方法如石灰法、石灰-铁盐法、硫化法以及臭葱石法的运行现状和研究动态。通过详细分析含砷酸性废水除砷工艺研究现状，着重探讨了上述除砷技术的反应原理、除砷效果、工艺特点，并对含砷酸性废水未来处理技术的发展趋势及研究方向进行了展望，为有色金属行业清洁高效除砷工艺选择及改进提供参考借鉴。     

重金属工业废水处理工艺的研究

文章研究了重金属工业废水一段石灰中和-二段聚铁沉淀-缓蚀阻垢-净化回用的工艺流程,一段中和pH值控制为9～10,二段中和pH值控制为7～8．5,聚铁加入量为150～250mg／L,缓蚀阻垢剂ZY605加入量为15～30mg／L。该工艺科学合理,处理后废水低于国家排放标准,添加阻垢剂后回用效果接近生产用水且经济效益显著。     

铅冶炼高砷酸性废水处理工艺的改进

介绍了石灰中和法+石灰铁盐法处理高砷制酸废水的生产工艺过程和实践效果。通过加入石灰乳pH值控制在12~12.5,砷浓度控制在30 mg/L以下。过滤后的滤液在调节池与一般酸性废水混合后,用硫酸调节pH值为7左右,再加入硫酸亚铁,用石灰乳控制pH值7~8,通入压缩空气曝气氧化,最后用石灰乳控制pH值9~10,可保证处理后废水中砷的浓度低于0.3 mg/L,处理后的水可回收利用。     

某金矿含砷铅碱性工业废水的处理试验研究

针对某金矿含砷铅碱性工业废水,研究了采用重金属捕集剂和聚铁联合除铅和砷。试验结果表明:用聚铁可去除废水中的砷,但聚铁用量较大,且对铅的去除没有作用;同时采用聚铁和重金属捕集剂TMT-18F,可有效去除砷和铅,且在相同除砷效果下,TMT-18F的加入可大大减少聚铁的用量,处理后的废水可达标排放。     

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。     

高浓度含砷酸性废水处理工艺研究

针对高浓度含砷酸性废水经石灰—铁盐法处理后仍未达标的情况,本文探索了石灰铁盐法处理后液加入聚合硫酸铁(PFS)+聚丙烯酰胺(PAM)混凝沉降除砷的工艺研究,以及在石灰铁盐法处理高浓度酸性废水过程中加入漂白粉、高锰酸钾等氧化剂氧化除砷的工艺研究,结果表明,PFS+PAM混凝沉降除砷工艺、漂白粉或高锰酸钾氧化除砷工艺均可实现达标排放,但PFS+PAM混凝沉降除砷工艺具有絮凝沉降速度快,操作简单、处理成本更低的优点,其新增药剂成本比漂白粉、高锰酸钾分别节省约6元/m~3、50元/m~3。     

高盐贵金属冶炼废水深度处理

为了确保废水稳定达标排放,通过技术改造,在原有冶炼废水处理设施上,采用TN-CMF技术对含铜、砷等金属和高浓度氯离子、硫酸根离子贵金属冶炼废水进行深度处理。生产实践表明:采用TN-CMF技术处理后,废水中重金属铜、砷去除明显,出水中铜浓度为0.21~0.32mg/L,平均为0.27mg/L;砷浓度为0.11~0.28mg/L,平均为0.21mg/L;p H为7.6~8.4;铅、锌、镉、镍等较低浓度污染物处理后浓度均小于0.05mg/L;出水中重金属残余浓度稳定达到《铜、钴、镍工业污染物排放标准》(GB25467-2010)的限值;废水渣渣量小,成分简单,进行有价金属回收利用的价值高;工艺废水中铜和微量的金、银等稀贵金属得到有效捕收。     

Fe(Ⅱ)-H_2O_2不同温度浸润改性活性炭吸附去除水中砷(Ⅴ)

Fe(Ⅱ)-H2O2不同温度浸润改性活性炭是采用FeSO4·7H2O添加H2O2在温度100℃下纯浸润24 h(Fe(Ⅱ)-24 h)和高温蒸发15 min(Fe(Ⅱ)-15 min)制备.对2类材料进行SEM表征并对其吸附1.1 mg/L砷(Ⅴ)的性能进行比较.SEM显示Fe(Ⅱ)(0.485%)-24 h(0.485%为Fe(Ⅱ)-24 h的铁含量,下同)表面覆盖厚的棒状纳米羟基铁,Fe(Ⅱ)(1.35%)-15 min表面覆盖薄而烧结扭曲羟基铁;高温蒸发15 min有利于铁负载;Fe(Ⅱ)-24 h(108~142 mg/gFe)对砷(Ⅴ)吸附的铁效率是Fe(Ⅱ)-15 min(57~63 mg/gFe)的2倍;Fe(Ⅱ)(0.485%)-24 h在2pH3.5或9pH12时对砷(Ⅴ)的吸附平衡容量高于Fe(Ⅱ)(1.35%)-15 min,同时Fe(Ⅱ)(0.485%)-24 h在不同pH值的条件下铁的溶出量低于Fe(Ⅱ)(1.35%)-15 min;SO42-、NO3-、ClO4-、PO43-抑制Fe(Ⅱ)(0.485%)-24 h对砷(Ⅴ)的去除,PO43-抑制效果更为明显,Cl-(100 mg/L)和BrO3-促进其对砷(Ⅴ)的去除.     

铁锍处理铜冶炼废酸试验研究

铜冶炼烟气制酸产生的废酸中砷质量浓度3.0~10.0 g/L、铜质量浓度0.1~3.5 g/L,酸度60~120 g/L,试验考察了不同硫化剂对砷的去除效果,确定采用铁锍进行铜冶炼废酸处理,并对其影响因素进行优化,获得了最佳处理工艺。试验结果表明:在铁锍破碎细磨至-74μm占80%以上、用量为沉铜、砷理论用量的1.2倍,反应时间2 h条件下,处理后的铜冶炼废酸中砷质量浓度降至低于0.03 g/L,砷去除率可达到99.5%以上,且反应速率可控,不引入其他杂质,满足铜冶炼废酸除砷的要求。     

电位调控-硫化沉淀联合技术沉淀锌的实验研究

采用电位调控-硫化沉淀法对含Zn2+100 mg/L的矿山酸性废水进行深度处理.结果表明,采用10%石灰乳液为中和药剂预先除铁,其用量为7.5~14 mL/L,沉铁时间为30 min,铁的去除率可以达到80%以上;除铁后的溶液采用硫化法沉淀锌,以NaHS为硫化剂,pH值为3.4,PAM用量为1 mL/L,氧化还原电位控制在6~76 mV时,矿山酸性废水中的Zn2+的去除率达到96.85%以上.     

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.