重金属强化含金矿石的氰化浸出

通过分析铊、铋、汞和铅等重金属强化金氰化溶解的电化学原理,对含金氧化物矿石和难浸硫化物金精矿进行了重金属强化浸金研究.结果表明:重金属对金氰化溶解的阳极过程有显著的强化作用,但在常规供氧条件下,金的溶解速率并未显著提高;只有同时采用阴极强化措施,才能使重金属起到显著提高金溶解速率的作用;对于含金氧化物矿石,单独采用重金属强化即可明显提高浸金速率,如果在过氧化氢助浸的基础上添加重金属,金的浸出速率会有更大幅度的提高;对硫化物金精矿而言,单独采用重金属无明显强化效果,只有在添加过氧化氢作为辅助氧化剂的基础上,重金属对金的浸出才能起到强化的作用,该体系中过氧化氢起到了强化阴极过程和氧化硫化物的双重作用.     

球团回转窑建模与仿真的研究进展

摘要：回转窑是一种高温处理物料的热工设备,充分了解回转窑内发生的物理与化学变化对生产具有指导意义,而人眼观察或利用仪器等方式难以探查窑内情况。为掌握回转窑内处理物料的情况并提高生产效率,国内外利用建模与仿真的方法模拟回转窑结构、窑内热场、物料运动。现有模拟已经涉及到了回转窑整体、窑壁、耐火材料、烟气、燃料、火焰、物料等,并利用建模与仿真结果研究了回转窑结构参数及生产参数对部分现象的影响。根据窑内不同区域,综述了回转窑建模与仿真的进展,汇总了建模与仿真的方法与过程及部分参数对回转窑生产的影响。回顾与分析现有的回转窑建模与仿真成果,有助于优化回转窑设备结构的设计及回转窑生产。     

Novel technology on preparation of double-layered pellets for sulfur and arsenic-bearing gold concentrates

Double-layered pellet （DLP） roasting is a novel pretreatment method for sulfur and arsenic-bearing gold concentrates. In this process, preparation of DLPs is a fundamental step which is required to produce DLPs with favorable mechanical strength and thermal stability. Studies were carried out to investigate the affecting factors and conditions on the preparation and properties of DLPs. The results show that moisture content has significant influence on DLPs preparation. With the increase of moisture content in the range of no more than 9.8%, drop resistance and compressive strength of green DLPs are raised and the pelletizing dynamics is improved accordingly. The optimum conditions are determined as moisture content of 9.8%, coating time of 14-16 min, drying temperature 〈80 ℃and drying gas velocity 〈1.2 m/s. When DLPs prepared under these conditions are roasted at 600 ℃ for 1 h, favorable removal and solidifying rates can be obtained, in which the removal rates of arsenic and sulfur are 94.38% and 82.55%, and the solidifying rates of arsenic and sulfur reach 99.62% and 99.79%, respectively. These results promise industrial application of DLP roasting.     

Effect of dolomite on reduction swelling property of iron ore pellets

The effect of various dosages of dolomites on the reduction swelling property of iron ore pellets was studied. Experimental results show that the reduction swelling index(RSI) decreases from 13.35% to 4.0%, while the porosity of roasted pellets increases from 35% to 40% with increasing the dolomite dosage from 0 to 10.5%. Meanwhile, the content of magnesium ferrite with high melting temperature, as well as the stability of magnetite(Fe3 O4) in the roasted pellets, increases with increasing the magnesium oxide(MgO) content from dolomite. The reasons for the decrease of RSI rely on the absence of crystal transformation from Fe2 O3 to Fe3 O4, the increased porosity of roasted pellet, and the suppression of phase transition of 2CaO·SiO2 resulted from the incorporation of magnesium into calcium silicate.     

小兴安岭北部新民金矿床地质特征及成因

新民金矿床地处小兴安岭-张广才岭多金属成矿带北缘，矿床矿体赋存于光华组长石砂岩、粉砂岩、泥质粉砂岩夹凝灰岩中；金矿化三要表现为含矿岩石发生强烈硅化、黄铁矿化、毒砂矿化和金矿化，矿体呈脉状、扁豆状、透镜状等，规模相对较小；矿床形成明显与特定岩性有关，受断裂构造控制，矿石矿物组成简单且含量较低，矿石组构特征显示其属于浅成（低压）低温热液成因。     

高温煤焦油沥青黏结剂碳化固结作用在炭质型材中的应用与研究进展

高温煤焦油沥青（high temperature coal tar pitch,HTCTP）具有优良的润湿性和黏结性,可用作黏结剂。HTCTP黏结剂能与炭质颗粒物料产生良好的固结作用,因此在不同类型炭质型材的制备中获得广泛的应用与研究,HTCTP高温过程的黏结性能及碳化固结作用效果决定了炭质型材的机械强度和理化性能。本文综述了HTCTP作黏结剂制备炭质型材的一般工艺过程和相关研究进展,梳理了不同应用领域对HTCTP碳化固结作用的共性机制和个性特点,总结了HTCTP的性能影响因素及碳化固结作用机理。通过分析HTCTP不同组分在碳化固结过程中的作用及转化过程,揭示HTCTP碳化固结作用与炭质型材机械强度的关联机制及影响碳化固结强度的关键因素,提出强化HTCTP碳化固结作用的措施,提升HTCTP黏结剂在炭质型材制备中的应用效果。     

白云石和蛇纹石对烧结矿质量及显微结构的影响

白云石和蛇纹石对烧结矿质量及显微结构影响的研究结果表明:配加白云石提高烧结矿的MgO含量,烧结矿转鼓强度降低,而配加蛇纹石提高烧结矿的MgO含量时,转鼓强度提高.配加白云石后,烧结矿矿物组成主要为铁酸钙与骸晶状赤铁矿,骸晶状赤铁矿周围有大量以玻璃质物相存在的硅酸盐矿物,且有大量微细裂纹;烧结矿孔隙率大,气孔为大孔薄壁结构,所以烧结矿强度低.配加蛇纹石后,烧结矿矿物组成主要为磁铁矿和铁酸钙,钙铁橄榄石矿物增多变大,气孔为中孔厚壁结构,所以烧结矿的质量得以改善.     

一种重组融合抗菌肽ClavE-HD5的原核表达

根据海鞘Clavanins抗菌肽(ClavE)氨基酸序列和人HD5氨基酸序列,设计了一个融合的新抗菌肽ClavEHD5,通过PCR方法以大肠杆菌偏好密码子合成该融合重组肽的编码DNA,将该DNA克隆到大肠杆菌表达载体pET30α中,构建了ClavE-HD5的融合表达质粒。测序结果表明,克隆分子序列正确,可以表达1个12kDa的带标签融合蛋白。经转化大肠杆菌表达菌株E.coli Rosetta(DE3)后,以IPTG诱导并经Tricine-SDS-PAGE检测发现,凝胶中出现预期大小的多肽带,表明成功表达出重组的ClavE-HD5的融合抗菌肽。