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含砷铁矿石烧结脱砷的试验研究吕庆1,张淑会1,胡晓1(1.河北省唐山市河北理工大学冶金与能源学院)摘 要:采用化学分析,XRD,高倍显微镜,EDS,XPS及原子吸收光谱分析等测试技术确定华南含砷铁矿石的理化性质,研究不同因素对华南含砷铁矿石烧结脱砷的影响并确定适宜的烧结脱砷工艺参数.结果表明:华南含砷铁矿石主要以磁铁矿和脉石为主,其中砷以FeAsS及少量As2S3形式存在,其质量分数为0.282%.华南含砷铁矿石烧结过程砷化物主要发生FeAsS的氧化和热分解反应.在弱氧化气氛条件下,华南含砷铁矿石的脱砷率随反应......
Solvothermal synthesis of nano-CeO2 aggregates and its application as a high-efficient arsenic adsorbentJing-Hua Pang,Ying Liu,Jun Li,Xiao-Jiao YangCollege of Materials Science and Engineering... and the largest specific surface area of 110.92 m2·g-1. Owing to the high activity derived from the high specific surface area of the aggregates, the application as arsenic(As) adsorption was also studied......
氢化物发生-原子荧光光谱法测定锰矿中砷结果的不确定度评定刘文甫1,应文河1(1.天津市中钢集团天津地质研究院有限公司矿产测试中心)摘 要:对氢化物发生-原子荧光光谱法测定锰矿中砷含量的不确定度来源进行分析,表明不确定度主要来源于样品称量过程,待测溶液定容体积,标准溶液配制,校准曲线拟合以及待测溶液重复测量.通过对各分量的不确定度评定,得到合成标准不确定度,在此基础上将合成标准不确定度乘以95%置信度下的扩展因子2,得到扩展不确定度,最后给出了含有扩展不确定度的砷测定结果.关键词:氢化物发生-原子荧......
, and then is evaporation crystallized. Key words: copper electrolyte; sulfur dioxide; purification; copper sulfate; arsenic trioxide 1 Introduction Removal of As, Sb and Bi impurities from copper electrolytes... electrolyte. The species in the copper electrolyte at 65 ℃ are almost the same as those at 25 ℃. Fig. 3 Distribution of S(Ⅳ) as function of pH Fig. 4 Distribution of arsenic as function of pH......
Kinetics study of leaching arsenic from Ni-Mo ore roasting in dust mixture of hydrochloric and sulfuric acidsHOU Xiao-chuan(侯晓川)1, 2, YANG Yun-de(杨润德)1, LI He(李贺)1, ZENG-li(曾理)2, XIAO Lian-sheng(肖连生... of leaching arsenic from Ni-Mo ore roasting dust was investigated. The effects including leaching temperature, particle size of the smelter dust, stirring speed, the coef？cient β (the molar ratio of sodium......
.矿样XRD分析表明其主要成分为黄铁矿,其次为砷黄铁矿和石英,其化学成分分析结果见表1(由北京矿冶研究总院分析). 表1 含砷难处理金矿指定化学成分分析 Table 1 Specific element analysis of arsenic-bearing refractory gold ore (mass fraction, %) 主要实验试剂如下:浓硫酸,相对分子质量... of DO concentration with time in arsenic- bearing refractory gold ore biooxidation at different pulp densities 矿浆中φ值是由Fe3+和Fe2+的比值决定的,SAND等[18]认为黄铁矿的生物氧化过程主要由两个步骤组成,分别为细菌氧化Fe2+生成Fe3+(见式(1))和Fe3+氧化矿石的反应(见式......
Trans. Nonferrous Met. Soc. China 29(2019) 2411-2421 Removal of arsenic from acid wastewater via sulfide precipitation and its hydrothermal mineralization stabilization Bin HU1,2, Tian-zu YANG1,2... of Refractory Nonferrous Metals, Changsha 410083, China Received 14 February 2019; accepted 26 August 2019 Abstract: To achieve a safe treatment of arsenic-containing acid wastewater, a new process......
磷砷渣返回压煮处理的工艺研究 王蓉颜1 (1.株洲硬质合金厂,湖南株洲,412000) 摘要:分析了在黑钨精矿碱压煮条件下,磷砷渣中钨和污染因子砷的行为.通过试验,摸索了磷砷渣返回压煮处理的工艺条件.在过碱系数1．42,加入氧化剂等添加剂的情况下,适量的磷砷渣与精矿一起压煮,精矿分解率达98．8％,溶液质量满足后续工序要求,同时实现了有害磷砷渣向无害钨渣的转化. 关键词:磷砷渣; 压煮; 黑钨精矿; 钨渣; phosphorous－arsenic slay; wolframite concentrate; pressure digestion; harmless tungsten slag; [全文内容正在添加中] ......
砷(Ⅲ)-碘酸钾-中性红体系催化动力学荧光光度法测定痕量砷朱仁和1,陈兰化1(1.安徽省淮北市淮北师范大学化学与材料科学学院)摘 要:在H2SO4介质中,痕量As(Ⅲ)对碘酸钾氧化中性红的反应具有显著的催化作用,使其荧光强度减弱,据此提出了动力学荧光法测定As(Ⅲ)的新方法.详细研究了中性红,碘酸钾和硫酸的用量以及反应温度和时间对As(Ⅲ)测定的影响.结果表明,在最佳条件下,砷的质量浓度在2.0~600μg/L范围内与溶液荧光强度的改变值呈良好的线性关系,检出限为0.6μg/L.本法用于环境水样中As(Ⅲ)的测......
等最佳条件下,该复合光催化剂对偶氮染料的脱色率可达98%. 关键词:黏土-SA_(0.1_; 偶氯砷染料; 磁性; 复合催化荆; clay-SA_(01); azo arsenic dye; magnetism; composite catalyst; [全文内容正在添加中] ......
