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以酸性氯化铜蚀刻废液为原料,在Na2CO3和助剂A存在下,采用一步沉淀法制备碱式碳酸铜。考察了反应pH、n(Na2CO3)∶n(助剂A)、反应时间和反应温度对碱式碳酸铜制备效果的影响,并采用XRD、TG 及SEM对产品进行了表征。实验结果表明:在反应pH 7.0、沉淀剂配比n(Na2CO3)∶n(助剂A)=1∶2、反应时间1.0 h、反应温度70 ℃的条件下,产品的w(Cu2+)达55.62%,w(Cl-)为0.013%,符合HG/T 4825—2015《工业碱式碳酸铜》的要求;蚀刻废液中Cu2+的回收率接近100%。表征结果表明,制得的产品为单一组分CuCO3·Cu(OH)2,小颗粒为直径1.8~5.4 μm的不规则球形,团聚后的大颗粒呈姜块状形貌,粒径为48~75 μm。 相似文献
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以三种树叶焚烧测定结果为例,分析了植物燃烧过程中产生的二类。研究结果表明,不同植物焚烧排放的二类浓度不同,含氯高时排放二类浓度也较高。二类对生态环境和人类健康有巨大的危害,分析二类污染物的农业面源情况,对于进一步有效控制和降低二类的排放,有重要的现实意义。 相似文献
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The impact of moisture on the partitioning of the heavy metals including Pb,Zn,Cu and Cd in municipal solid waste (MSW) was studied in a laboratory tubular furnace.A thermodynamic investigation using CHEMKIN software was performed to compare the experimental results.Simulated waste,representative of typical MSW with and without chlorine compounds,was burned at the background temperature of 700 and 950°C,respectively.In the absence of chlorine,the moisture content has no evident effect on the volatility of Pb,Zn and Cu at either 700 or 950°C,however,as flue gas moisture increasing the Cd distribution in the bottom ash increased at 700°C and reduced at 950°C,respectively.In the presence of chlorine,the flue gas moisture reduced the volatility of Pb,Zn and Cu due to the transformation of the more volatile metal chlorides into less volatile metal oxides,and the reduction became significant as chlorine content increase.For Cd,the chlorine promotes its volatility through the formation of more volatile CdCl 2.As a result,the increased moisture content increases the Pb,Zn,Cu and Cd concentrations in the bottom ash,which limits the utilization of the bottom ash as a construction material.Therefore,in order to accumulate heavy metals into the fly ash,MSW should be dried before incineration. 相似文献
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以水泥窑常用的替代燃料——生活垃圾和污泥为研究对象,测定其含氯量并进行聚类分析,结果表明:替代燃料中,以3种垃圾筛上物中的含氯量最高:填埋垃圾筛上物0.292%、原生垃圾筛上物0.280%及堆肥垃圾筛上物0.276%。垃圾组分中,以织物类含氯量最高(0.263%),其次为塑料(0.246%),食品略高于纸张(0.192%)。矿化土、污泥中含氯量较为接近,均在0.12%以下。水泥窑各替代燃料中的氯含量均远远超过水泥入窑生料安全含量的0.015%。将替代燃料制备成RDF后,市政污泥、垃圾筛上物及垃圾组分中氯含量变化不大,差异不显著。按照含氯量高低,水泥窑替代燃料可以分为3类:第1类含氯量大于0.20%,包括垃圾筛上物及垃圾中的塑料、织物类等大部分可燃物;第2类含氯量为0.15%0.20%,包括垃圾中的纸张、食品;第3类含氯量低于0.15%,主要是污泥。 相似文献
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选用甲基登分光光度法测定工业尾中氯含量,其优点是试药得,显色稳定,定量范围广,操作简便,分析快速,成本低,同时用相比例法计算氯的含量,结果令人满意。 相似文献
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Effects of chlorine content and position of chlorinated phenols on their oxidation kinetics by potassium permanganate 总被引:1,自引:0,他引:1
IntroductionThemolecularstructuresofphenolsshowcharacteristicofhighlyresonance .Sincechlorineisawithdrawingelectronatom ,substitutionofchlorineonaromaticringcancausemanysignificanteffectsonthereactivityofphenols(Folke,1986;Barbeni,1987;Aitken ,1994 ) .Forexample ,… 相似文献
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