河道淤砂提钪浸出试验研究

对从河道淤砂中提取钪的新工艺进行了研究。试验考察了盐酸、硝酸、硫酸以及盐酸加助溶剂浸出钪时各因素的影响和浸出效果,以及氯化焙烧浸出、碱熔合浸出的浸出效果。试验结果表明,在三种酸的浸出试验中HN03浸出率为59．20％,略高于盐酸,但盐酸加助熔剂浸出率高达80．94％。而氯化焙烧浸出、碱熔合一水解浸出的浸出率分别高达82,79％和99．79％。     

Effects of intense magnetic field on digestion and settling performances of bauxite

The effects of magnetic field intensity, roasting temperature and roasting time on digestion rate and settling performance of bauxite with different iron contents were investigated systematically. The results indicate that such magnetic treatment can profoundly change the microstructure and digestion performance of bauxite. For the two samples carrying different iron contents, phase transformation of the aluminum oxide phase proceeds faster in the high iron bauxite than the low one. The optimal pretreatment conditions of low iron bauxite are roasting temperature 550 ℃ and magnetic field intensity 6 T, while for high iron bauxite are 500 ℃ and 9 T. The digestion rate of alumina can reach 95% and 92% at digestion temperature of 190 ℃ and 250 ℃. The settling performances of roasted ore by intense magnetic field after digestion are enhanced through pretreatment.     

Kinetics study of leaching arsenic from Ni-Mo ore roasting in dust mixture of hydrochloric and sulfuric acids

The kinetics 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 coefficient β（the molar ratio of sodium chlorate to arsenic in the smelter dust） and the initial H＋ concentration on leaching arsenic were studied. The results indicate that the leaching of arsenic increases sharply with the decrease of particle size. The orders of reaction with respect to H＋ concentration and particle size are determinted to be 1.136 and 1.806, respectively. The leaching of arsenic reaches 99% under experimental conditions, the apparent activation energy is determined to be 11.157 kJ/mol, which is consistent with the values of activation energy for diffusion model The kinetics equation of leaching arsenic from the roasting dust could be expressed by a semi-empirical equation as 1-2/3η （1 -η）^2/3 = k0（c[H＋]）^1.136ro^-1.806 exp[（-11157 /RT）t].     

MoO3-x/SiO2催化剂的制备及其在氧化脱硫中的应用

以钼酸铵为前驱体、亲水性SiO₂为载体,采用等体积浸渍法制备了负载型MoO_3-x/SiO₂系列催化剂。利用X射线衍射(XRD)、拉曼光谱(Raman)、紫外光谱(UV-Vis)、N₂吸附-脱附、X射线光电子能谱仪(XPS)和氢气程序升温还原(H₂-TPR)等技术手段对催化剂性质进行表征。以乙腈为萃取剂、过氧化氢为氧化剂的氧化脱硫反应中,研究了催化活性与催化剂表面性质的内在规律关系。结果表明,MoO_3-x活性组分的团聚是抑制氧化脱硫活性的主要原因,适宜的焙烧温度有利于获得所需活性位点且分散性高的催化剂,可有效对H₂O₂快速活化,提高DBTs脱硫率。在焙烧温度为350℃、O/S摩尔比为3、反应温度为60℃的最佳脱硫条件下,苯并噻吩(BT)、二苯并噻吩(DBT)和4,6-二甲基二苯并噻吩(4,6-DMDBT)的脱除率分别为77.2%、99.3%、96.4%。该催化体系中DBT的脱除率可达到国家脱硫标准(<10μg...     

层状Cu/SiO2催化剂的制备及其草酸二甲酯加氢性能研究

以层状硅酸铜为前驱体制备了不同焙烧温度下的层状Cu/SiO₂催化剂。利用N₂吸脱附、XRD、FT-IR、SEM、TEM、XPS等手段对催化剂的结构性质进行表征。结果表明,500℃下焙烧得到的催化剂比表面积大、Cu物种分散度最高、Cu颗粒尺寸均一,前驱体中层状硅酸铜的质量分数最高,还原后Cu⁺相对含量最高。将该催化剂应用于草酸二甲酯(DMO)选择性加氢制乙醇酸甲酯(MG),在2 MPa、200℃、H₂/DMO物质的量的比为100的反应条件下DMO的转化率为98.5%,MG的选择性为52.1%,并且层状Cu/SiO₂催化剂表现出良好的稳定性。     

纳米单斜相ZrO2的制备

沉淀法制备了ZrO2,重点考察了煅烧温度ZrO2粉体性质的影响,并用热重法-差示扫描量热法、X-射线衍射和N2物理吸附等手段对粉体进行了测试和表征。结果表明,随煅烧温度的升高,ZrO2的比表面积、平均孔径和孔容大幅度下降,微晶尺寸逐渐增大,单斜相ZrO2的含量增加,四方相的含量减少。1000℃时ZrO2粉体完全以单斜相存在。600℃煅烧2 h制得了单斜相为主的ZrO2粉体,其微晶尺寸为21.6 nm,比表面积为39.2 m2/g、平均孔径为11.7 nm,孔容为0.23 cm3/g。     

云南某硅酸盐型铁矿选矿试验研究

随着富矿开采日渐枯竭,贫矿开发的重要性越发显著.本文以云南具有代表性的某硅酸盐型低品位铁矿为研究对象,对其进行了详细的工艺矿物学研究,并根据原矿性质特点进行选矿试验研究,分别进行了弱磁选以及弱磁尾矿的强磁选、摇床重选及还原焙烧—弱磁选等试验,并最终确定了弱磁选提磁铁矿和还原焙烧—弱磁选提赤铁矿、褐铁矿的选矿流程.通过两步磁选,获得的铁精矿平均铁品位为60.07％,铁回收率为74.35％.     

无钙焙烧渣作为焙烧填料的贮存期研究

研究了焙烧填料贮存期对铬铁矿无钙焙烧过程的影响。结果表明,无钙焙烧浸出渣经分选后粗渣作为氧化焙烧填料时,填料的焙烧活性及填料性能随贮存期的延长而提高。在相同配料及焙烧条件下,随着填料贮存期的延长,氧化焙烧熟料中游离碱含量降低、水溶铬含量升高,回转窑的稳定运行时间增长。结合无钙焙烧生产铬盐的工业实践,填料的贮存风化期以6~8个月为宜。     

东海炭素天津工厂6万t软质炭黑项目9月投产

东海炭素公司天津工厂的年产6万t软质炭黑项目计划于2013年9月正式投产,东海炭素公司的炭黑年总产能将达到51万t。其中,公司在日本本土的3家工厂的炭黑年产能合计为22万t,日本石卷工厂曾在地震中受到严重破坏,现已完全恢复生产;泰国工厂     

东海天津工厂6万t扩建项目9月投产

东海炭素公司天津工厂的6万t软质炭黑项目,预计在今年9月正式投产。待项目投产之后,该公司的炭黑总产能将达51万t。该公司日本国内3家工厂的合计产能为22万t,