铜闪速炉悬浮熔炼反应过程机理的研究(Ⅱ)——粒子脉动碰撞模型

Research of the Suspensions Smelting Reaction Process Mechanism in the Copper Flash Furnace PartⅡ:Particle Pulsation Collision Model

在总结前人闪速熔炼反应模型——粒子分裂模型和两粒子碰撞模型的基础上,根据对金隆闪速炉反应塔工艺物料颗粒高温急冷试样的分析结果,通过从微粒运动学、两相流体力学以及统计分析和归纳等方面的论证,提出了闪速熔炼过程反应模型——粒子脉动碰撞模型(简称PPC Model),认为:在闪速炉反应塔不同高度上,精矿粒子的分裂和颗粒群内粒子脉动碰撞过程同时存在;精矿粒子脉动是粒子碰撞聚合主要原因;随着氧化反应的进行,在颗粒中心形成熔融硫化物和SO_2气泡,颗粒外表面是多孔的氧化铁壳;熔融核中气相的生成促使粒子分裂和脉动,当地氧气浓度和温度越高,这一过程越强烈;反应塔中由于粒子的大小、粒子的成分、粒子的周围的氧气浓度和粒子温度的不同,导致各粒子之间的氧化程度差别极大;过氧化粒子在反应塔中下降时,它们彼此之间、或者与反应慢的欠氧化粒子相碰撞,聚合长大,同时过氧化颗粒被欠氧化粒子还原。

Flash smelting is the main method of copper pyrometallurgy. The reformation of modern copper flash smelters depend on the developments of the basic theory of flash smelting whose lucubrating is based on the right establishment of the smelting model in reaction shafts. In the dissertation, a new flash smelting theory -Particle Pulsation Collision Model was presented with overall analysis on the reacting particles in the shaft of the flash smelter, with conclusions of the former research results, and with the proving from micro -particle kinematics, two- phase fluid dynamics, statistic analysis and conclusion. The specific statements on the Particle Pulsation Collision Model are as follows ： The particle splitting and collision co - exist at different height of reacting shaft. It is presented that the concentrate particle pulsation is the main reason for particle collision and gathering with the analysis on pulsation and collision of the high intensive turbulent jet of particle group. With the oxidation continuance, melted sulphide and S02 babbles are formed at the particle center. The Out - surface of the particle is porous ferric oxide shell. The gas formation in melting core impels the particle splitting and collision. The higher the oxygen concentration and the particle temperature are, the intenser the process is. Because of the difference of the sizes, components, surrounding oxygen concentration and temperature of the particles, particles＇oxidation have much difference. Dropping in the shaft, the over - oxidized particles collide each other or with the under - oxidized particles and gather to become bigger. At the same time, the over - oxidized particles are deoxidized by the under - oxidized particles.