磷石膏基有机吸附剂的制备及其对Pb(Ⅱ)的吸附试验研究

研究了用聚丙烯酸(PAA)改性磷石膏(PG)制备新型复合吸附剂PG/PAA,并用于吸附去除废水中的Pb(Ⅱ)。利用SEM、BET、FT-IR表征了PG/PAA的结构和性能。结果表明：改性后磷石膏基吸附剂表面形貌由光滑变得粗糙，比表面积和孔容减小，官能团也有所改变；在溶液pH=5.0、PG/PAA用量1 g/L、初始Pb(Ⅱ)质量浓度50 mg/L、吸附时间30 min条件下，PG/PAA对Pb(Ⅱ)的吸附量达49.34 mg/g;吸附过程符合准二级动力学模型和Langmuir等温吸附模型，吸附过程自发放热；PG/PAA吸附Pb(Ⅱ)的机制包括螯合、配位作用和离子交换。     

碱浸和污泥强化对钢渣陶粒除磷效果的影响

为提高钢渣除磷效果,采用碱浸预处理,并添加污泥强化制备碱浸钢渣-蒙脱土-污泥复合钢渣陶粒,与钢渣-蒙脱土-可溶性淀粉复合陶粒进行对比研究,探讨强化后钢渣陶粒的除磷性能和除磷机理,考察含磷溶液中磷的去除。结果表明,两种钢渣陶粒的最大除磷率均可达到93%,磷酸盐浓度为1 mg/L时,碱浸-污泥强化钢渣陶粒的最佳投加量为0.5 g,显著低于未强化钢渣陶粒（1 g）。扫描电镜显示碱浸-污泥强化钢渣陶粒孔隙更为密集。X射线衍射表明两种陶粒内含多种金属盐,可与水样中磷酸根离子发生反应将其去除。两种陶粒对Langmuir吸附等温方程拟合度最高,碱浸-污泥强化钢渣陶粒吸附饱和时,最大吸附量（39.18 mg/g）高于未强化钢渣陶粒(19.18 mg/g)。两种陶粒对准二级动力学模型的拟合度高于准一级动力学模型,表明两种陶粒对磷吸附属于单分子层吸附,以化学吸附为主。     

锆-铈@凹凸棒土复合吸附剂的制备及其除磷性能试验研究

研究了用凹凸棒土、氧氯化锆和氯化铈制备锆-铈@凹凸棒土复合吸附剂,并通过单因素试验和响应面优化法考察所制备吸附剂对磷的去除性能及再生效果,分析其除磷机制。结果表明：所制备复合吸附剂表面粗糙,对磷的吸附主要基于羟基与磷酸根的配位交换;在废水初始磷质量浓度10 mg/L、pH=6.0、吸附剂用量1.6 g/L、吸附时间120 min条件下,磷去除率达96.31%,且去除效果稳定;用盐酸再生吸附剂,重复脱附—吸附3次,磷去除率仍保持在76%以上;磷浓度-pH及磷浓度-复合吸附剂用量对去除率的交互影响显著。     

织金稀土磷精矿的硫酸循环浸出

采用硫酸循环浸出稀土磷精矿,对磷酸溶液和石膏洗液中P2O5与稀土的富集以及浸出率的情况进行研究。结果表明:在硫酸过量系数为1.03,液固比3.5∶1,时间3h,温度75℃的浸出条件下,再经2次石膏洗涤后,磷酸溶液中P2O5的浓度可以富集到280g/L,ΣREO的浓度可以富集到340mg/L左右,P2O5和ΣREO的浸出率分别为92.46%和31.76%。     

MnO2脱除废水中磷的试验研究

研究了用二氧化锰从含磷模拟溶液中除磷,考察了二氧化锰用量、溶液初始pH、反应温度、反应时间和搅拌速度对除磷效果的影响。结果表明:溶液初始磷质量浓度21.20mg/L,在二氧化锰用量3.5g、溶液初始pH=2.5、反应温度20℃、反应时间30min、搅拌速度200r/min条件下,磷脱除率达98%,处理后的废水符合国家工业废水磷排放标准。利用该法处理磷初始质量浓度为9.73mg/L的钨冶炼废水,可同样达到优异的除磷效果。     

高比表面积超细氧化镁的制备及吸附水体中磷的性能

针对水体磷污染治理问题,以菱镁矿轻烧粉为原料,采用矿石沉淀煅烧法制备高比表面、超细氧化镁产品,研究了反应物浓度、反应温度、热解时间、搅拌速率和表面活性剂添加量对氧化镁比表面积和粒度的影响。采用XRD、SEM、BET、FTIR和粒度分布仪对制备的氧化镁进行表征,并对其磷吸附性能进行了研究,探讨了其吸附机理。结果表明,在硫酸镁浓度0.5 mol/L、反应温度80 ℃、反应时间120 min、搅拌速率300 r/min、表面活性剂添加量0.5%的条件下,制备的多孔层状氧化镁比表面积为125.52 m2/g,平均粒度为15.17 μm。将该氧化镁用于吸附磷废水,对磷酸根的吸附量为141.2 mg/g,去除率为70.6%,该氧化镁对磷的吸附机理为物理吸附与化学吸附反应两种吸附方式共同作用,且以化学吸附为主。     

膨润土的改性及其对废水中磷吸附效果的研究

[目的]研究改性膨润土对废水中磷吸附的影响.[方法]采用盐酸和煅烧两种方法对鹏润土分别进行酸改性和热改性,研究了不同浓度酸改性及不同温度热改性时膨润土磷吸附的影响,并探讨了热改性膨润土的最佳温度及pH值.[结果]在废水浓度20 mg/L、膨润土投加量2%(重量比)时,对磷的吸附效果随着酸用量的增加而增加,9%盐酸改性后磷去除率由18.14%提高到45.59%;热改性后磷去除率上升为41.17%,最佳热改性温度为500℃,在弱酸及弱碱性条件下有利于500℃热改性膨润土吸附除磷,pH=9时,10 mg/L磷溶液中磷的去除率可达92.77%,磷剩余浓度为0.47 mg/L,达到国家城镇污水处理厂一级A排放标准.[结论j酸改性和热改性均可显著提高膨润土的磷吸附效果.     

城市垃圾焚烧炉渣处理含磷废水的实验研究

城市垃圾焚烧炉渣对磷有较好的去除效果,在初始磷酸盐浓度低于200mg/L时,对磷的去除率几近100％,在初始浓度为1000mg/L时,去除率达67％。对除磷后的炉渣进行磷的形态分析表明,溶液中磷酸盐首先被炉渣快速吸附．之后与炉渣中的Ca、Al、Fe等金属发生化学反应,转化成稳定的Ca2-P、Ca8-P、Al-P、Fe-P和Ca10-P等沉淀态磷。     

磷钼蓝分光光度法测定环境水样中无机磷

一种新的硫酸亚铁铵-果糖混合还原剂用于钼蓝光度法测定磷。在0.6 mol/LH2SO4介质中,硫酸亚铁铵-果糖将磷钼杂多酸还原成杂多蓝,其最大吸收波长为824 nm,表观摩尔吸光系数为2.56×104L.mol-1.cm-1,PO34-质量浓度在0~2.4 mg/L范围内符合比尔定律。除砷和硅外,水样中共存元素对测定没有干扰;加入1 mL 50 g/L酒石酸钾钠溶液可分别消除0.01 mg As(,Si(干扰。方法用于环境水样中无机磷的测定,结果满意。     

磷钼蓝分光光度法测定工业硅中磷

采用氢氟酸-硝酸溶解样品,高氯酸冒烟驱除硅、氟,加入抗坏血酸、显色溶液后直接显色测定,建立了磷钼蓝分光光度法测定工业硅中0.001%～0.27%磷含量的分析方法。结果表明,溶液中磷质量浓度在0.05～1.40 μg/mL范围内符合比尔定律;方法中磷的检出限为0.000 46 μg/mL;表观摩尔吸光系数ε₈₂₅=2.75×10⁴ L·mol^-1·cm^-1;样品中其他共存离子不干扰测定。不同实验室应用实验方法测定3个工业硅行业标准样品中磷的结果均与认定值吻合;按照实验方法测定2个工业硅行业标准样品中磷的结果与国标方法GB/T 14819.4－2012和GB/T 14819.5－2012的测定值均基本一致。将实验方法用于工业硅行业标准样品和工业硅实际样品中0.001%～0.27%磷的测定,实验所得结果的相对标准偏差(RSD,n=22)为1.4%～4.5%。
     

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.