延长回转窑窑头锁口耐材寿命的措施

回转窑窑头锁口耐材使用寿命短,直接影响到链篦机-回转窑球团生产线的作业率。通过长期的观察和分析,找出了影响窑头锁口耐材使用寿命的原因,并采取了相应的改造措施,使窑头锁口耐材的使用寿命由原来的6个月延长到18个月,为球团生产线的顺行、稳产提供了保障。     

RH真空炉耐火材料的选材分析与应用

针对新钢第一炼钢厂110 t RH真空炉投产初期耐火材料使用寿命偏低的问题,对RH真空炉各部位的耐火材料技术要求进行了分析,制定了合理的砌筑、烘烤、冷却制度及科学的使用、维护方法,从而延长了RH真空炉的关键部位——下部槽和浸渍管的使用寿命。     

某难选锌硫矿石选矿工艺研究

在对某矿石岩矿鉴定的基础上,针对其富含磁黄铁矿的矿石性质,选矿试验确定两种方案进行试验。一方案为单一浮选流程,产品为锌精矿和硫精矿(磁黄铁矿与黄铁矿);另一方案为浮-磁-浮流程,产品为锌精矿、硫精矿及磁黄铁矿。对比单一浮选流程和浮-磁-浮流程工艺及试验结果,确定选用单一浮选流程     

某夕卡岩型难选钨锡多金属矿石工艺矿物学研究

采用工艺矿物学的研究方法,并结合国际先进的MLA矿物自动定量技术,查明了某夕卡岩-复合构造型难选钨锡多金属矿石矿物组成,钨、锡的赋存状态及主要矿物的嵌布特性和解离特性。工艺矿物学研究结果为该矿石的有价金属回收起到重要的指导作用。     

特殊结构换热器的制造

介绍了一台特殊结构换热器的制造工艺过程。其特殊结构在于在管箱与腔体之间空隙、在过渡段与钢管之间空隙和在管板表面上均需浇注耐火材料。通过采取适当的焊接、热处理及组装工艺,较好地完成了这台换热器的制造,保证了产品质量。为同类结构的关键设备提供了借鉴。     

耐火材料导热系数的影响因素

本文介绍了耐火材料导热系数的定义、测量原理及影响因素,并且从几个方面讨论了耐火材料导热系数的影响因素。     

Thermal and thermomechanical evaluations of channel induction furnace applying strong insulation containing lightweight aggregates

Monolithic materials with a strong thermal insulating effect are required by the foundry industry for further energy savings, meanwhile possible premature wear of refractory linings caused by over-insulation should be avoided. A monolithic insulating material containing lightweight aggregates possessed strong thermal insulation and was proposed to replace the traditional insulating material made of chamotte currently used in a channel induction furnace. To evaluate the new lining concept, creep of the working lining was considered in the finite element modelling and followed the classical von Mises creep model, which was defined with the Norton–Bailey strain hardening creep equation. The results showed that the lightweight design of the insulating lining reduces the heat loss from the steel shell and material consumption. Moreover, the thermomechanical loads in the refractory linings and steel shell remain within a reasonable range when compared with the currently in-use refractory lining concept.     

机械活化强化载金硫化矿浸出的研究进展

综述了近十年国内外来在载金硫化矿机械活化方面的研究工作,介绍了硫化矿机械活化机理、机械活化强化硫化矿的浸出和机械活化设备的应用。需要应用现代分析手段和量子理论模型深入研究机械活化前后矿物界面的变化,并且需要建立设备、工艺对机械活化机理的影响机制。最后对机械活化的研究发展前景和方向进行了总结。     

Mineralogical characterization and pretreatment for antimony extraction by ozone of antimony-bearing refractory gold concentrates

The mineralogical characterization of antimony-bearing refractory gold concentrates and the antimony extraction by ozone in HCl solution were investigated. The mineralogical study shows that there exist stibnite(Sb₂S₃), arsenopyrite(FeAsS), pyrite(FeS₂) and quartz in the concentrates, and the gold is mainly (67.42%) encapsulated in sulfides. The antimony extraction by ozone in hydrochloric acid was employed and the influences of temperature, liquid/solid ratio, HCl concentration and stirring speed on the extraction of antimony were investigated. High antimony extraction (93.75%) is achieved under the optimized conditions. After the pretreatment by ozone, the antimony is recovered efficiently and the gold is enriched in the leaching residue.     

粉煤灰为基制备耐火材料的研究

以粉煤灰为主要原材料,煤矸石和工业氧化铝为辅料,通过控制物料比例制备了不同Al2O3含量在不同烧结温度下的耐火材料.对所制备材料进行结构性能测试,并借助X射线衍射和扫描电镜对材料进行微观分析.实验结果表明:不同的烧结温度及氧化铝含量对耐火制品的致密性、力学性能、耐火度和晶型状态都有影响.制品在1350 ℃、Al2O3的含量为45%时,其性能指标为:体积密度2.47 g/cm3、常温耐压41 MPa、耐火度1450 ℃、晶型状态以莫来石相和刚玉相为主.该制品的力学性能和使用性能较好,可为进一步利用粉煤灰制备高附加值材料奠定基础.