Process route for low grade itabirites concentration: Magnetic separation preceding flotation

Cationic reverse flotation of quartz is the standard or reference concentration route for itabirites containing at least 45% iron. Preceding the flotation stage, desliming in hydrocyclones must be conducted to remove ultrafine and colloidal particles from the flotation feed. The flotation performance assessed by weight and metallurgical recoveries and silica contamination in the concentrate is impaired by lower iron feed grades. Exploratory experiments of magnetic separation indicated that iron oxide particles in the size range <37 µm are entrained toward the non-magnetic product. This finding suggested a campaign of testing an alternative circuit consisting of magnetic separation preceding reverse flotation. Magnetic separation plays the roles of desliming and pre-concentration. The achieved content of silica in the alternative route concentrate was 1.46%, meeting the market specification for blast furnace pellet of 2%. The alternative route yielded significant gains in weight and metallurgical recoveries, reaching values 3.3% and 4.4% higher, respectively.     

提高二精A／S合格率途径探讨

本文分析了深度脱硅改造后烧结法二精A/S合格率的现状,根据理论分析和生产现场实践,提出了提高二精A/S合格率的途径:保证-精A/S大于300;钠硅渣彻底分离;保证二次脱硅时间;石灰乳加入量合适.     

酶技术在茶叶深加工中的应用研究

综述了单宁酶、纤维素酶、困胶酶、蛋白酶、多酚氧化酶等酶制剂在茶叶深加工中的应用研究现状,并对其在茶叶深加工中的应用前景进行了展望。     

土豆渣微生物深加工初步研究

从98株药用真菌中,筛选出一株对淀粉和纤维素均有较强降解能力的菌株。利用该菌株发酵培养基蒸煮之后的土豆渣,可以液化土豆渣,生产富含膳食纤维的发酵产品,其中总膳食纤维含量达到18.34g/L,可溶性膳食纤维含量为1.40g/L,为土豆渣深加工提供新的途径。     

Adsorption of HCN and H2O vapor mixtures by activated and impregnated carbons

Adsorption isotherms for HCN-H₂O vapor mixtures have been determined on BPL grade activated carbon and on ASC whetlerite (impregnated) carbon. The results show that the adsorption of HCN by carbons which are already in equilibrium with high levels of water vapor is significant. Adsorption of HCN strongly dominates when HCN and H₂O are simultaneously adsorbed from the vapor phase. Adsorbed HCN discourages additional adsorption of water vapor.     

芬顿法深度处理造纸废水

利用芬顿(Fenton)法对造纸废水生化出水进行深度处理,考察了废水pH值、反应时间、FeSO4投加量和H2O2投加量对废水中色度和CODC r去除率的影响。结果表明:在pH值为5.00、FeSO4投量为400 mg/L、30%H2O2投量为200 mg/L,反应时间为30 m in,出水CODC r可降至60 mg/L以下,色度的去除率可达到74%,可以满足更为严格的造纸废水排放标准,为进一步的工程设计提供依据。     

SolidWorks 二次开发方法的研究

详细介绍了SolidWorks的对象模型及其常用操作的API函数，并调用API函数开发了一个标准件库，对SolidWorks的二次开发有重要的参考价值。     

基于SolidWorks的化工设备标准件的二次开发

在介绍SolidWorks二次开发原理的基础上,运用SolidWorks进行化工设备标准件二次开发。以实例介绍在SolidWorks中创建化工设备标准件菜单的方法,利用VB的ADO技术访问数据库,并建立用户界面与数据库的数据连接的编程要点,以及根据程序代码实现化工标准件自动建模的方法。     

凹凸棒石粘土的开发利用现状及发展趋势

凹凸棒石粘土是一种主要产于我国安徽嘉山和江苏盱眙一带的稀有非金属矿.主要从凹凸棒石粘土的矿物特性、选矿技术、深加工技术及应用领域等方面,综述了国内凹凸棒石粘土开发应用现状,并指出了开发中的一些问题和发展趋势.     

旋流器脱泥溢流中微细粒级锡石回收探索试验

针对都龙矿区选矿厂旋流器脱泥抛尾溢流中锡金属损失高的问题,采用SLon离心选矿机与浮选工艺可有效实现微细粒级锡石的回收,脱泥溢流含锡品位0.134%,通过离心选矿机一粗一精流程选别可获得精矿产率7.36%,含锡品位0.981%,回收率54.28%的技术指标;离心选矿机精矿按照7%的比例与选厂锡石浮选给矿进行混合选别,可获得精矿含锡品位3.57%,回收率74.83%的选别指标。研究成果为选矿厂后续进一步降低旋流器抛尾溢流中锡金属损失提供借鉴参考意义。