共搜索到323条信息，每页显示10条信息，共33页。用时：0小时0分0秒515毫秒
量浓度提高,OH-离子浓度增加,溶液未饱和度增加,增加了与铝土矿的接触面积[16].当苛碱质量浓度增加到一定值时,溶液的黏度增加,其扩散过程受到限制,氧化铝溶出性能受到影响,所以,当苛碱质量浓度增加到250 g/L时,氧化铝相对溶出率下降. 图4 苛碱质量浓度对溶出效果的影响 Fig. 4 Effect of caustic mass concentration on digestion...氧化铝相对溶出率为94.01%；当CaO添加质量分数为12%时,氧化铝相对溶出率下降4.5%.CaO添加质量分数过高,加速水和铝硅酸钙的生成,导致氧化铝损失[17]. 图5 CaO添加质量分数对溶出效果的影响 Fig. 5 Effect of CaO mass fraction on digestion performance 2.3.3 溶出温度及时间对氧化铝溶出率的影响 图6所示为溶出温度及......
J. Cent. South Univ. (2017) 24: 1281-1287 DOI: 10.1007/s11771-017-3533-6 Simultaneous production of hydrogen and volatile fatty acids from anaerobic digestion of Macrocystis pyrifera biomass... was investigated. 2 Materials and methods 2.1 Inoculum and substrate Anaerobic digested sludge (ADS) was used as inoculum, which was collected from a 1000 m3 sludge digestion tank in Qingdao Tuandao Waste......
类号:TF821 文献标志码:A 文章编号:1672-7207(2014)05-1397-06 Digestion technology of Guizhou...) Abstract: The digestion experiments of lime Bayer process using diasporic bauxite from Guizhou Province with low and medium grades (alumina-silica ratio is 5.48) were completed. The influences of lime amount......
during Bayer digestion at high temperatureLI Xiao-bin, LI Chong-yang, QI Tian-gui, ZHOU Qiu-sheng, LIU Gui-hua, PENG Zhi-hong(National Engineering Laboratory for Efficient Utilization of Refractory... and sodium aluminate solution, the effects of digestion temperature and composition of the sodium aluminate solution on the reaction behavior of pyrite were investigated by the analysis of contact angle, X......
and sulfur content was prepared by the high-pressure digestion of pyrite at 260 ℃. The influences of temperature, residence time, caustic ratio αk and the content of Na2CO3, Na2SO4 and Na2C2O4...; sodium aluminate solution; mass concentration of iron; high-pressure digestion 随着我国优质铝土矿资源的日渐匮乏,高硫铝土矿的充分利用问题引起人们极大关注.采用拜耳法处理高硫铝土矿生产氧化铝时,矿石中的硫(特别是S2-)会在生产过程中积累,并产生一系列不良后果[1],不仅增加碱耗,腐蚀设备,结疤严重,而且会造成循环母液溶出液颜......
一水硬铝石矿物的悬浮溶出器参数曹文仲1,田伟威2,钟宏3(1.江西省南昌市南昌大学环境科学与工程学院2.南昌大学 环境与化学工程学院,南昌 3300313.中南大学 化学化工学院, 湖南 长沙, 410083)摘 要:研究铝土矿拜尔法悬浮溶出设备参数.采用粒径范围判据判定颗粒周边液体的流态,由悬浮矿物微粒的流动力学和溶出动力学试验结果,计算铝土矿悬浮溶出器设计参数.结果显示,对于属难浸出的一水硬铝石型铝土矿,工业氧化铝拜尔法溶出工艺所用的溶出器,采用悬浮溶出器可实现最优化溶出.关键词:冶金技术； ......
J. Cent. South Univ. Technol. (2007)04-0514-06 DOI: 10.1007/s11771-007-0100-6 Microwave digestion polarography for determining seven trace elements in Salvia Miltiorrhiza Root and compound Salvia... Science Instrument Ltd., Shanghai) were used. 2.3 Procedure 2.3.1 Digestion of samples 1 g of the powder Salvia Miltiorrhiza Root samples dried in a desiccation box (105......
Trans. Nonferrous Met. Soc. China 30(2020) 1662-1673 Digestion mechanism and crystal simulation of roasted low-grade high-sulfur bauxite Hong-fei WU1,2, Chao-yi CHEN1,2, Jun-qi LI1,2, Yuan-pei LAN1,2... suspension roasting and muffle furnace roasting to remove sulfur and enhance digestion properties. The results show that sulfur can be efficiently removed, and the alumina digestion properties......
微波消解-火焰原子吸收光谱法测定磷矿石中铅刘国文1,王旭刚2,崔东胜3,龚福忠2(1.广西壮族自治区防城港市 广西防城港出入境检验检疫局2.广西大学 化学化工学院,广西南宁 5300043.中国检验认证集团广西有限公司,广西防城港 538001)摘 要:采用微波消解技术对磷矿石样品进行预处理,确定了溶样酸介质及其用量,微波消解压力,时间等关键因素,建立了火焰原子吸收光谱法测定磷矿石中铅的方法.实验结果表明,在盐酸,硝酸,硫酸,王水等四种溶样介质中,以王水的溶样效果最好,其适宜用量为每克样品5 mL.采用3步的微......
利用微波消解-无银催化法检测水中化学需氧量薛文平1,刘文伟1,黄德智1,元世勇1(1.辽宁省大连市大连工业大学化工与材料学院)摘 要:研究了采用微波消解-无银催化测定CODCr的新方法,并探讨了该方法测定CODCr时样品消解条件对检测结果的影响;实验还采用硫酸锰,硫酸镍,硫酸铜,硫酸镁,硫酸铁分别作催化剂,微波加热快速消解后测定CODCr,同时与国家标准方法测定结果进行比较,确定了最佳催化剂,最佳投加量和消解时间.对比结果表明:当试样体积为5 mL时,0.250 mol/L K2Cr2O7的用量为5 mL,硫酸......
