用吸附沉淀法从湿法炼锌硫酸锌溶液中除氟试验研究

研发了一种高效除氟剂,采用吸附沉淀法从硫酸锌溶液(F-质量浓度280mg/L)中除氟,通过优化试验确定最佳反应条件。结果表明:在除氟剂加入量为F-质量浓度15倍、反应时间60min、反应温度60℃、溶液pH=5条件下,氟去除率达82.83%,除氟后液中F-质量浓度低于50mg/L,符合锌电解要求;对含不同浓度镁、亚铁、锌和镉离子的硫酸锌溶液进行除氟,溶液中锌和镉离子质量浓度对除氟影响很小,镁质量浓度低于7.5g/L、亚铁离子质量浓度低于10g/L对除氟影响也很小。     

铝工业含氟溶液实验研究

本文采用化学沉淀法,使用饱和氢氧化钙溶液作为沉淀剂处理铝工业中的含氟溶液,研究分析了氟钙比、温度、反应时间以及不同浓度氟离子对除氟效果的影响,结果表明：氟钙比为1∶1.5,反应温度为室温,反应时间为30min,含氟溶液浓度在4000mg/L～8000mg/L时除氟效果较为显著,除氟率达96.3%以上。     

从高氟氯次氧化锌中回收锌铅

采用氢氧化钠和碳酸钠混合碱液洗涤脱除次氧化锌中的氟氯。在碱液中氢氧化钠和碳酸钠摩尔比为1∶1,控制液固比、洗涤温度时,氟、氯脱除率分别为92.31%和96.57%。碱洗液经沉锌、沉氟、沉氯处理,溶液中锌、氟、氯浓度分别为0.37、0.048、0.083g/L。采用锌电解废液浸出经碱洗脱除氟氯后的次氧化锌,控制电解废液硫酸浓度、液固比、浸出温度,浸出液中锌、铅、氟、氯浓度分别为86.27g/L、0.027g/L、0.042mg/L、0.078mg/L,浸出渣中锌和铅含量分别为9.13%和50.84%,锌和铅回收率分别为95.36%和96.57%。     

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。     

污酸废水中氟离子和氯离子处理实验研究

利用硫酸处理某铜冶炼厂的污酸废水中的氟离子和氯离子。通过正交实验得出,影响氟离子和氯离子去除效果的因素主次顺序为:时间酸度温度。通过单因素实验得出,在硫酸浓度600 g/L、时间60 min、温度132℃的条件下,氟离子浓度由6 880 mg/L降低到22 mg/L,去除率达99.7%;在硫酸浓度600 g/L、时间120 min、温度132℃的条件下,氯离子浓度由7 640 mg/L降低到69 mg/L,去除率达99.1%。     

湿法炼锌高压氧浸液中氯化亚铜沉淀法脱氯试验研究

采用锌粉置换获得的铜粉从湿法炼锌高压氧浸液置换脱氯,对影响脱氯效果的各因素进行了研究。结果表明,高压氧浸液除铁后再采用氯化亚铜沉淀法脱氯效果更好,脱氯最佳工艺条件为:溶液初始酸度为4 g/L,初始铜离子浓度2.5 g/L,锌粉加入量1.3 g/L,反应温度60℃,反应时间120 min。脱氯后溶液中氯离子浓度可以由0.48 g/L降到0.2 g/L以下。     

水蒸气蒸馏-离子色谱法测定湿法炼锌溶液中氟和氯

将水蒸气蒸馏和离子色谱法相结合建立了湿法炼锌溶液中氟和氯的测定方法。在硫酸(2+1)介质中,于165~175 ℃的温度下将样品蒸馏25 min,蒸馏过程中生成的氟化氢和氯化氢随着水蒸气通过冷凝管冷却,然后流入接收瓶,被氢氧化钠碱液吸收。吸收液通过直径为0.22 μm水系滤膜,进入离子色谱仪,氟和氯离子被测定。样品中的基体及与氟、氯离子共存的其他离子对测定没有干扰。氟离子和氯离子的质量浓度分别在0.2~2 mg/L和0.5~5 mg/L范围内与其对应的峰面积呈良好的线性关系,线性回归方程分别为y=0.661 x-0.398和y=0.827 x,检出限分别为0.006 mg/L和0.01 mg/L。方法用于湿法炼锌溶液的合成液和预上清液中氟和氯的测定,合成液的测定值与参考值相符合,相对标准偏差(n=11)分别为3.2%(F)和4.0%(Cl);预上清液中氟和氯的测定值分别为40.0 mg/L和371 mg/L,回收率分别为91%和88%。     

硫酸锌溶液离子交换脱氟氯

以含氟氯硫酸锌溶液为原料,采用离子交换法研究氟氯离子的脱除。试验筛选出D201树脂对氟氯离子有较好的吸附和解吸性能。多级动态试验结果表明,经D201树脂处理,将Cl-浓度由原液497.61mg/L降至58.77mg/L,Cl-脱除率88.19%;F-浓度由原液201.17 mg/L降至178.64mg/L,F-脱除率11.98%。动态吸附后的载氟氯D201树脂,用4mol/L硫酸液可将氟氯解吸,氟解吸率高于95%,氯解吸率高于99%。     

钢渣吸附剂去除废水中氟的试验研究

采用振荡吸附实验,研究了吸附时间、溶液pH值、溶液中F-初始浓度和钢渣投入量等因素对钢渣吸附F-的影响。结果表明,钢渣对F-均有较好的去除能力,钢渣吸附除氟适宜时间为90min;钢渣在吸附除氟时,pH值适应范围较宽,钢渣除氟的适宜pH值为4-10;用钢渣除F-时,氟的初始浓度越大吸附去除率越大;钢渣的投入量增加,氟的去除率增大,处理100mL浓度40mg/L含氟废水,钢渣用量增加到9.0g左右时,氟的去除率可达77.77%,出水剩余浓度达到国家工业含氟废水一级排放标准。     

含铁、铝、钙复合除氟剂除氟性能

采用回收废旧锂离子电池除铁、铝时得到含铁、铝、钙的副产物为复合除氟剂,在含2.94g/L F-的水溶液中复合除氟剂除氟的最优条件为:除氟剂添加量20g/L、溶液初始pH=3～4、温度60℃、反应时间30min,此条件下,除氟率可达98%,除氟剂吸附容量约144mg/g。SEM、EDS和XRD表征结果表明,复合除氟剂的主要物相为棒状硫酸钙和非晶态铁铝水解产物,除氟后残渣中有氟化钙和六氟铝酸钠生成。     

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.