铜冶炼企业生产废水除氟工艺实践研究

以某铜冶炼企业生产废水为研究对象，采用聚合硫酸铁协同硫酸铝对生产废水进行除氟试验。根据试验结果表明，在低砷废水（砷含量小于1mg/L）中氟含量小于30mg/L条件下，废水与一定量的聚合硫酸铁、硫酸铝、PAM、熟石灰（聚合硫酸铁添加量为0.1g/L，硫酸铝添加量为2～3g/L）反应并将溶液的pH值调整至在6～8的之间时，反应后的废水中氟<5mg/l，低于回用水标准，砷含量可以降低至0.5mg/L以内，能够满足GB 25467—2010《铜、钴、镍工业污染物排放标准》。     

铝土矿选矿尾矿酸法提铝除铁实验研究

采用黄钾铁矾法,对铝土矿选矿尾矿酸法提铝后的高铁硫酸铝溶液进行了除铁实验,考察了亚铁离子的氧化条件、除铁反应的pH、时间、温度、晶种等因素对除铁效果的影响,确定了黄钾铁矾法除铁的最佳工艺条件为:先将高铁硫酸铝溶液在温度为30℃,双氧水用量为100 ml/L,时间为5 min的条件下氧化处理,然后在温度为95℃,pH=2,晶种用量为10 g/L,反应时间为180 min的条件下反应除铁。此条件下溶液的除铁率为95%,铝损失15%,溶液微黄。     

The Study of Extracting Alumium and Removing Iron from Bauxite Tailings by Acid Method

采用黄钾铁矾法,对铝土矿选矿尾矿酸法提铝后的高铁硫酸铝溶液进行了除铁实验,考察了亚铁离子的氧化条件、除铁反应的pH、时间、温度、晶种等因素对除铁效果的影响,确定了黄钾铁矾法除铁的最佳工艺条件为:先将高铁硫酸铝溶液在温度为30℃,双氧水用量为100 ml/L,时间为5 min的条件下氧化处理,然后在温度为95℃,pH=2,晶种用量为10 g/L,反应时间为180 min的条件下反应除铁.此条件下溶液的除铁率为95％,铝损失15％,溶液微黄.     

江西浒坑钨矿矿山废水净化处理试验及工业应用研究

针对江西浒坑钨矿矿山废水固体悬浮物浓度较高且粒子以胶体稳定存在,水体pH值较低,呈较强的酸性,金属元素Mn、Zn含量严重超标的问题,本研究以“石灰脱稳-絮凝沉降”工艺对该废水进行净化处理,研究混凝剂种类及用量、pH值对废水处理效果的影响。当添加0.15 g/L石灰调节废水pH值为10.5,采用聚丙烯酰胺（PAM）作为混凝剂且用量为10 mg/L时,净化处理后上清液的pH值和金属元素Mn、Zn含量均达到《污水综合排放标准》（GB 8978—1996）排放标准,Mn、Zn元素去除率分别高达98.80%和99.04%,废水净化处理效果十分显著。并且结合试验结果,设计出该废水处理工艺流程,并应用于工业废水处理,既高效解决了该废水存在的诸多难题,又预防处理后清水pH值偏高导致无法直接排放的问题。     

用硫酸铝去除高氟硫酸盐溶液中的氟

以硫酸铝为除氟剂，研究了采用化学沉淀法从废锂离子电池回收过程中产生的高氟硫酸盐溶液中除氟。考察了除氟剂添加量、反应温度、反应时间、溶液初始pH和静置时间对氟去除率的影响，并借助XRD、SEM表征了除氟产物形貌。结果表明：在除氟剂添加量10 g/L,反应温度25℃,溶液初始pH=4.5,反应时间30 min,静置3 h条件下，氟去除率达98.79%,除氟后溶液中氟离子浓度约48.69 mg/L;除氟产物为纯度较高的空心八面体冰晶石，所得冰晶石分子比为3,属于高分子冰晶石。     

钨酸钠浓料铝盐除氟工艺探讨

以黑白钨混合矿碱分解工艺中的钨酸钠浓料液为研究对象,研究了时间、温度、pH、加料量以及三氧化钨浓度对硫酸铝除氟效果的影响。结果表明,在最佳工艺条件下,调节pH为12.7,温度为25 ℃,加料量摩尔分数x(Al)∶x(F)为2.1,反应时间为10 min,三氧化钨浓度为215 g/L,此时溶液中氟浓度可降至100 mg/L以下。进一步研究表明,钨酸钠浓料中三氧化钨浓度越高,硫酸铝除氟效果越差,且会增大除氟渣中钨的含量。     

用过氧硫酸氧化处理偶氮染料酸性绿20废水

研究了采用电解硫酸法制备氧化剂,并用以处理以酸性绿20为代表的偶氮染料废水,初步确定了氧化剂添加量、反应时间、反应温度、催化剂种类、催化剂添加量和氧化剂投加方式等对酸性绿20废水处理效果的影响。确定的最佳反应条件为:废水中酸性绿20质量浓度200 mg/L;以硫酸钴为催化剂,分2次投加;氧化剂添加量30 mL/L;催化剂添加量0.02 g/L;反应温度60℃;反应时间60 min。在最佳条件下,酸性绿20废水的脱色率达100%,COD去除率达90%。紫外光谱分析结果表明,偶氮键最先断裂,随后萘环、苯环断裂,发色团被破坏,这是本方法处理偶氮染料废水的主要机制。     

从含铁硫酸铝中除铁

利用高锰酸钾作氧化剂对含铁硫酸铝溶液进行除铁试验研究,探讨了溶液pH、氧化剂用量、硫酸铝溶液浓度等因素对除铁效率的影响。试验确定的最佳的除铁工艺条件为:溶液pH为3.0,溶液中硫酸铝质量分数为30%,反应时间15 min,反应温度(100±5)℃。产品中铁质量分数可降至0.27%。用X射线衍射表征了产品结构。     

赣南某钨矿山废水悬浮物处理试验研究

采用混凝法处理钨矿山废水中的悬浮物,研究不同混凝剂、混凝剂用量、搅拌强度、pH值、沉降时间等对废水处理效果的影响,得出优化操作条件。试验表明:采用石灰乳+FeCl3工艺处理该尾矿库外排水效果好,最佳工艺条件为:废水pH值调节至10左右,FeCl3的投加量为15mg/L左右,搅拌强度为250r/min,快速搅拌0.5min,然后50r/min慢速搅拌5min,沉降时间为60min。在此工艺条件下,悬浮物去除率可达到98.4%,上清液悬浮物含量可降至5.4mg/L。     

提铝钠铁后赤泥残渣的除氟性能

赤泥近年来被广泛研究作为废水处理的吸附材料。采用无氧高温还原—浸出—磁选工艺回收赤泥中铁、铝及钠后的残渣仍含适量的活性物质,以该残渣为吸附剂,研究其对高氟水的除氟性能。以配制含氟25mg/L的水溶液为处理对象,获得的最适宜除氟条件为:溶液初始pH=5、残渣添加量25g/L、温度40℃、吸附时间30min,该条件下除氟效率到达72.19%。     

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

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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.