采用“二水法”湿法磷酸工艺对阿联酋某中品位磷矿进行了制酸评价研究,通过单因素实验得到了“二水法”湿法磷酸最适宜的生产控制条件,包括游离SO_(3)浓度、磷酸浓度、停留时间和液固比4个主要工艺参数。磷矿制酸系统在最适宜工艺参数...采用“二水法”湿法磷酸工艺对阿联酋某中品位磷矿进行了制酸评价研究,通过单因素实验得到了“二水法”湿法磷酸最适宜的生产控制条件,包括游离SO_(3)浓度、磷酸浓度、停留时间和液固比4个主要工艺参数。磷矿制酸系统在最适宜工艺参数控制下连续运行24 h,磷石膏滤饼采用二级逆流洗涤,磷矿中P_(2)O_(5)转化率可达到97.9%,回收率可达到96.9%,料浆的过滤强度约为10.5 t P_(2)O_(5)每平方米每天(TPD P_(2)O_(5)/m^(2))。展开更多
Latitude D系列曾是Dell在商用市场的主力军，出入写字楼、机场，随处可见它的身影。但是，随着时间的推移，D系列的造型愈发显得中庸：色彩传统、线条圆滑。品味越来越高的商务人士们更希望拥有集卓越气质、质感和风格与一体的商用笔...Latitude D系列曾是Dell在商用市场的主力军，出入写字楼、机场，随处可见它的身影。但是，随着时间的推移，D系列的造型愈发显得中庸：色彩传统、线条圆滑。品味越来越高的商务人士们更希望拥有集卓越气质、质感和风格与一体的商用笔记本。2008年9月，Latitude E系列的诞生，彻底宣告商务机型不一定是稳重、低调的代名词，它让戴尔、也让整个商用笔记本行业完成了一次崭新的跨越。展开更多
Massive amounts of low-grade tin middlings have been produced from tin tailings,in which arsenic and tin are worthy to be recycled.Owing to high sulfur content in these tin middlings,a novel self-sulfurization roastin...Massive amounts of low-grade tin middlings have been produced from tin tailings,in which arsenic and tin are worthy to be recycled.Owing to high sulfur content in these tin middlings,a novel self-sulfurization roasting was proposed to transform,separate and recover arsenic and tin in this research.There was no extra curing agent to be added,which decreased the formation of pollutant S-containing gas.The self-sulfurization process involved a two-stage roasting of reduction followed by sulfurization.First in reduction roasting,FeAsS decomposed to FeS and As and the As then transformed to As_(4)(g)and As_(4)S_(4)(g),via which the arsenic was separated and recovered.The arsenic content in the first residue could be decreased to 0.72 wt.%.Accompanied with it,the FeS was firstly oxidized to Fe_(1−x)S and then to SO_(2)(g)by the coexisted Fe_(2)O_(3),and finally reduced and combined with the independent Fe_(2)O_(3)to form Fe_(1−x)S.In the followed sulfurization roasting,the Fe_(1−x)S sulfurized SnO_(2)to SnS(g),due to which tin could be recovered and its content in the second residue decreased to 0.01 wt.%.This study provided an efficient method to separate and recover arsenic and tin from low-grade tin middlings.展开更多
文摘采用“二水法”湿法磷酸工艺对阿联酋某中品位磷矿进行了制酸评价研究,通过单因素实验得到了“二水法”湿法磷酸最适宜的生产控制条件,包括游离SO_(3)浓度、磷酸浓度、停留时间和液固比4个主要工艺参数。磷矿制酸系统在最适宜工艺参数控制下连续运行24 h,磷石膏滤饼采用二级逆流洗涤,磷矿中P_(2)O_(5)转化率可达到97.9%,回收率可达到96.9%,料浆的过滤强度约为10.5 t P_(2)O_(5)每平方米每天(TPD P_(2)O_(5)/m^(2))。
基金Project(52174384)supported by the National Natural Science Foundation of ChinaProject(LZB2021003)supported by Fundamental Research Funds for the Central Universities,China。
文摘Massive amounts of low-grade tin middlings have been produced from tin tailings,in which arsenic and tin are worthy to be recycled.Owing to high sulfur content in these tin middlings,a novel self-sulfurization roasting was proposed to transform,separate and recover arsenic and tin in this research.There was no extra curing agent to be added,which decreased the formation of pollutant S-containing gas.The self-sulfurization process involved a two-stage roasting of reduction followed by sulfurization.First in reduction roasting,FeAsS decomposed to FeS and As and the As then transformed to As_(4)(g)and As_(4)S_(4)(g),via which the arsenic was separated and recovered.The arsenic content in the first residue could be decreased to 0.72 wt.%.Accompanied with it,the FeS was firstly oxidized to Fe_(1−x)S and then to SO_(2)(g)by the coexisted Fe_(2)O_(3),and finally reduced and combined with the independent Fe_(2)O_(3)to form Fe_(1−x)S.In the followed sulfurization roasting,the Fe_(1−x)S sulfurized SnO_(2)to SnS(g),due to which tin could be recovered and its content in the second residue decreased to 0.01 wt.%.This study provided an efficient method to separate and recover arsenic and tin from low-grade tin middlings.
