生物接触氧化法处理校园污水的研究与设计

校园污水的主要污染物为BOD5、CODCr、SS、NH3-N。本设计采用生物接触氧化工艺处理校园污水,研究其去除效率。研究结果表明,经过处理,CODCr、BOD5、SS、NH3-N的去除率分别达到93%、97%、85%、72%,出水达到了中水回用的标准。     

处理钼精矿时附带提取铼

钼精矿是提取铼的主要原料.精矿中的铼含量(决定于矿床)为10~(-3)%～10~(-4)%.原苏联处理的钼精矿与中矿含铼较富(0.2～0.7kg Re/t精矿). 氧化焙烧是处理钼精矿的主要方法.国外氧化焙烧主要在多层焙烧炉内进行,只有某些小企业在管状回转炉内进行.原苏联多层炉仅用于某些所得焙砂含硫不大于0.2%的     

电催化氧化芬顿法处理高质量浓度含氰废水

电化学处理技术可应用于许多水处理领域,是一种基本对环境无污染的"绿色"水处理技术。该文采用电催化氧化-芬顿技术组合工艺对铅锌矿冶炼生产过程产生的难降解高质量浓度含氰废水处理进行试验研究,其结果表明:该处理技术是可行的,可以使铅锌矿含氰废水中的COD由11 810 mg/L降至60 mg/L以下、总去除率为99.5%,CN_T~-由2 350 mg/L降至0.5 mg/L以下、去除率近100%,达到了国家排放标准。该处理技术是在常温常压条件下进行的,电化学设备相对简单,工艺技术灵活,设备占地面积小,处理周期短、效率高,可控制性强,无二次污染。     

氯离子对难处理金精矿生物预氧化-炭浸氰化的影响

高盐矿区往往缺乏淡水资源供生产使用。针对矿区盐水现状,进行高砷难处理金精矿生物氧化-氰化提金试验,考查不同氯离子浓度对硫化物氧化率、金浸出率等技术指标的影响。结果表明,氯离子浓度对金精矿生物氧化的不利影响随着浓度的升高而增强,氯离子浓度1.5 g/L以上时,硫化物的氧化率显著降低,10 g/L氯离子盐水生物氧化延长至18 d,砷浸出率88.4%,硫氧化率仅为35.3%。相同生物氧化渣在相同氰化条件下采用清水和10 g/L氯离子盐水进行氰化浸出时,盐水将降低金的浸出率。1.5 g/L、5 g/L氯离子盐水生物氧化10 d后的氧化渣采用10 g/L氯离子盐水氰化,金的浸出率分别比清水氰化时的分别低2.8、3.4个百分点。难处理金精矿生物氧化砷浸出率均高于硫氧化率,表明毒砂氧化率高于黄铁矿,金浸出率与毒砂氧化率的相关性较黄铁矿氧化率更加密切。     

高铁硫化锌精矿直接浸出新工艺研究

在 10 0～ 110℃、0 4MPa及液固比 4 5～ 5 0条件下 ,硫酸氧化浸出高铁锌精矿 3～4h ,氧耗 90m3 /t矿 ,Zn、Cu、Cd和Fe的浸出率分别为 97%、80 %、95 %和 31% ,元素硫的产率为 2 10～ 2 32kg/t矿     

A/O生物脱氮工艺在焦化废水处理中的应用

泰钢焦化公司采用前置反硝化(A/O)工艺处理焦化废水,并在生化处理后增加芬顿氧化处理工艺。焦化废水处理工艺改造后,脱除氨氮的效果好,出水COD和氨氮能达到间接排放标准,出水水质指标CODCr降到150 mg/L以下,氨氮降到25 mg/L以下,减少好氧池加碱量,降低运行成本。     

乳化液破乳试验研究

废乳化液是轧钢过程中排放的高浓度含油废水,处理的关键是破乳。文章通过试验研究选择合适的破乳方法,对电氧化破乳和化学混凝破乳的试验条件进行选择。结果表明,最适宜的破乳方法是电氧化,电氧化破乳最佳电流范围为2.0～3.8 A,最佳电压范围为140～200 V;化学混凝破乳最佳混凝剂为聚合氯化铝,当加入量为1.5 g/L、pH值调整至7～9时,废乳化液中COD降低至8 000 mg/L以下,油含量降低至1 000 mg/L以下,悬浮物降低至1 500 mg/L以下。     

流态化制取三氧化二钒研究

对采用流态化技术,还原多钒酸铵(APV)制取三氧化二钒工艺及相关参数进行了研究,得到了合格的三氧化二钒产品.试验表明: APV在还原温度700～750 ℃、保温时间10～15 min的条件下可以得到TV≥63%的三氧化二钒产品,比回转窑方法所需时间短、温度低;更容易实现对温度和时间的控制,得到较高品位的三氧化二钒产品(TV>67%);流态化生产的三氧化二钒产品C含量低,更有利于钒铁冶炼对C含量的控制;同时,流态化生产三氧化二钒效率高、还原剂消耗少、设备固定、相对安全性更高.     

赣南某水库微污染水高锰酸钾预氧化处理试验

以赣南某水库微污染原水为处理对象,针对常规混凝处理工艺的不足,提出预氧化-混凝沉淀工艺.选用高锰酸钾为氧化剂,考察了高锰酸钾预氧化对混凝沉淀处理微污染水效果的影响.结果表明,在混合搅拌强度260 r/min,搅拌时间2 min,絮凝搅拌强度80 r/min,搅拌时间25 min的条件下,聚合氯化铝投加量为10 mg/L时,最佳预氧化条件为：预氧化加药点为投加混凝剂前2 min,高锰酸钾投加量1.0 mg/L,pH值为原水值,原水经预氧化-混凝沉淀处理后,浊度、CODMn、UV254、氨氮、铁、锰的去除率分别为99.02%、68.78%、50.94%、33.96%、96.77%、81.67%,出水水质基本达到《生活饮用水卫生标准》（GB5749-2006）,得出高锰酸钾预氧化-混凝处理工艺能较好地净化微污染水源水.     

电解液中Li2SO4对ZAlSi12合金微弧氧化膜特性的影响

采用微弧氧化技术在ZAlSi12合金表面制备氧化膜,研究了Li₂SO₄的加入对微弧氧化膜性能的影响.随着电解液中Li₂SO₄含量增加,试样表面氧化膜变厚且粗糙.X射线衍射分析表明,微弧氧化膜主要由Al₂O₃相和莫来石相组成.加入Li₂SO₄且经微弧氧化处理得到的试样耐腐蚀性能优于未经微弧氧化处理的试样.      

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.