铜锍底吹连续吹炼的运行实践

从铜锍品位、冷热态铜锍、氧浓、废杂铜品位及加入量、"三相"厚度、杂质元素对铜锍底吹连续吹炼的影响进行分析探讨,总结了试产一年来不同条件下铜锍底吹连续吹炼的运行实践。     

铜密闭鼓风炉生产效益的回归分析

通过铜密闭鼓风炉生产过程中关键指标的回归分析,寻找降低消耗、增加产出、提高经济效益的有效途径     

A kinetic model for the acid-oxygen pressure leaching of Ni–Cu matte

A semi-empirical mathematical model for the acid-oxygen pressure leaching of Ni–Cu matte is presented, based on data from batch leaching experiments. The primary controlling factor in the leaching process is found to be galvanic inhibition of the more highly oxidized copper and nickel sulfide species by less oxidized species, particularly Ni alloy and Ni₃S₂. The leaching rate of many species is greatly reduced by the presence of one or both of these phases, and others will not commence leaching until neither is present. The mathematical model is based on first-order chemical reaction controlled rate expressions, as the reactions occurring are electrochemical in nature. Mass transfer effects are included only empirically. Some possibly diffusion-related phenomena are noted, although the model is not extended to incorporate these effects on a fundamental level. The model is verified and extended by the inclusion of several different factors that were tested experimentally. The effects of variations in O₂ flow rate and partial pressure, initial particle size, reaction pulp density and initial acid concentration were all studied, and included in the model. Variations in O₂ flow rate and partial pressure are found to affect the reaction rates via the dissolved oxygen concentration in the solution phase.     

Flow and Heat Transfer Performance of Slag and Matte in the Settler of a Copper Flash Smelting Furnace

Simulation of two‐phase flow in a copper flash smelting settler with simultaneous tapping of slag and matte is carried out using Eulerian‐Eulerian two‐fluid model and the flow and heat transfer performance of slag and matte is examined. Detailed velocity vectors, temperature and volume fraction distributions are obtained. The results show that the small copper droplets will be suspended in the slag. When the droplet diameter is large enough, the slag and matte layer are clearly formed and the dispersion layer between the slag and matte layers becomes thinner at larger droplet sizes and its thickness remains nearly unchanged when the copper droplet diameter is larger than about 500 μm.     

柴油机NOX和PM排放控制技术的发展

NOX和PM是柴油机排放的主要污染物,文章分别介绍了目前国内外应用的减少柴油机NOX和PM排放的方法,并分析了其各自的优缺点.     

铜鼓风炉节约焦炭的实践

焦碳消耗是铜鼓风炉炼铜中的主要技术指标，本文应用生产中的大量效据。通过正交试验，指出了铜鼓风炉节约焦碳的主要途径，找出了铜鼓风炉节约焦碳的最佳工艺条件。     

银的分析

针对黄金行业生产中可能遇到的各种含银物料，结合前人的实践经验，对不同质量分数、不同性质的含银样品的分析方法进行了综合探讨。     

高冰镍氧化抑制浮选行为研究

利用纯矿物浮选研究了氧化剂对高冰镍可浮性的影响并根据电位－ｐＨ图,循环伏安曲线分析了高冰镍中Ｎｉ３Ｓ２矿在氧化状态下受抑时的表面性质。结果表明,氧化剂能提高矿浆电位,阻止黄药在矿表氧化及吸附,促进六方硫镍矿表面优先氧化,而使六方硫镍矿受抑。     

汽车内饰抗刮亚黑聚氨酯涂料的研制

为解决亚黑 PU涂料抗刮性能差的问题,根据汽车内饰涂料的特点及要求,通过筛选不同的羟基丙烯酸树脂、添加剂,并对各物料配比进行合理化设计,最终采用了中羟丙烯酸树脂与改性的功能树脂混拼,并搭配消光粉、镁强粉、蜡粉、蜡浆等,研制了一种具有良好抗刮性能的汽车内饰单涂亚黑 PU涂料。对涂膜的综合性能进行了测试,结果显示：制备的单涂亚黑 PU涂料涂膜综合性能优良,在抗刮划方面的效果理想,适合作为汽车内饰用漆推广应用。     

还原气氛下渣-锍两相平衡反应

通过考察还原气氛下熔渣与锍相之间的平衡情况,研究了渣-锍两相反应的影响因素及机理,探讨了还原产物的分配规律。结果表明,熔渣碱度提高有利于锍相还原反应的进行,添加CaS抑制锍相的还原。由于锍相成分及密度不同出现分层现象,造成锍相在熔渣中的夹杂损失。CaS与金属铁具有互斥性,当熔渣中CaS质量分数超过0.9%之后,渣相中几乎没有金属铁的存在;在选取的实验条件下,CaS在渣、锍两相的平衡分配比维持在0.5左右。