镁合金短流程合金化熔炼工艺研究进展

本文综述了镁合金短流程熔炼工艺的特点、关键技术以及该工艺的研究和应用进展。指出提前合金化是该工艺的特点,保护和净化为该工艺的关键技术,该工艺已经产业化,但产业化程度不高,全面产业化需短流程净化技术、熔剂成分与氧化物夹杂反应机制、新型高效环保熔剂的研制、渣液分离技术等相关科学和技术问题的解决。     

柳杉在硫磺土法冶炼区生态治理中的应用研究

本文选择柳杉在硫磺土法冶炼废弃冶炼场进行人工造林试验,通过对柳杉的生长适应及柳杉造林地生物多样性的分析,探索出柳杉适应在硫磺废弃冶炼场栽培生长,其人工造林对提高硫磺废弃冶炼场生物多样性具有良好的作用.     

Two-stage reduction for the preparation of ferronickel alloy from nickel laterite ore with low Co and high MgO contents

The preparation of ferronickel alloy from the nickel laterite ore with low Co and high MgO contents was studied by using a pre-reduction-smelting method. The effects of reduction time, calcination temperature, quantity of reductant and calcium oxide (CaO), and pellet diameter on the reduction ratio of Fe and on the pellet strength were investigated. The results show that, for a roasting temperature >800℃, a roasting time >30 min, 1.5wt% added anthracite coal, 5wt% added CaO, and a pellet size of~10 mm, the reduction ratio of Fe exceeds 70% and the compressive strength of the pellets exceeds 10 kg per pellet. Reduction smelting experiments were performed by varying the smelting time, temperature, quantity of reductant and CaO, and reduction ratio of Fe in the pellets. Optimal conditions for the reduction smelting process are as follows:smelting time, 30-45 min; smelting temperature, 1550℃; quantity of reductant, 4wt%-5wt%; and quantity of CaO, 5wt%; leading to an Fe reduction ratio of 75% in the pellets. In addition, the mineral composition of the raw ore and that during the reduction process were investigated by process mineralogy.     

Effect of diboron trioxide on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets

The effect of diboron trioxide (B₂O₃) on the crushing strength and smelting mechanism of high-chromium vanadium-titanium magnetite pellets was investigated in this work. The main characterization methods were X-ray fluorescence, inductively coupled plasma-atomic emission spectroscopy, mercury injection porosimetry, X-ray diffraction, metallographic microscopy, and scanning electron microscopy-energy-dispersive X-ray spectroscopy. The results showed that the crushing strength increased greatly with increasing B₂O₃ content and that the increase in crushing strength was strongly correlated with a decrease in porosity, the formation of liquid phases, and the growth and recrystallization consolidation of hematite crystalline grains. The smelting properties were measured under simulated blast furnace conditions; the results showed that the smelting properties within a certain B₂O₃ content range were improved and optimized except in the softening stage. The valuable element B was easily transformed to the slag, and this phenomenon became increasingly evident with increasing B₂O₃ content. The formation of Ti(C,N) was mostly avoided, and the slag and melted iron were separated well during smelting with the addition of B₂O₃. The size increase of the melted iron was consistent with the gradual optimization of the dripping characteristics with increasing B₂O₃ content.     

贵州汞冶炼与散布(英文)

贵州是我国著名的“汞省”，汞冶炼的结果表明：1983年汞生产过程中向大气散布的总汞是11t，1994年下降到5t．自从1994年以来，汞散布到大气的累积量是745t：从废水排放到水生系统是40t：以废渣形式累积到陆生生态系统的是450t．本文以贵州某汞矿作为研究汞污染的点源，研究大气和土壤中汞浓度随距离的变化而改变，从距汞源0.5km到3km大气汞浓度是180ng·m－3～20ng·m-3；从0.5km～15km，土壤中汞浓度是146μg·kg－1～2．2μg·kg-1．     

金川镍闪速熔炼渣的物相与铜镍分布

采用X射线衍射、光学显微镜、扫描电镜和电子探针微区分析等方法,研究金川镍内速熔炼水淬渣的主要物相组成和有价金属铜、镍在炉渣中的存在形式。结果表明,水淬渣的主要结晶物相为铁镁橄榄石,结晶相之间由玻璃相填充,细小的铜镍铁硫化物以星散状分布于炉渣中,有价金属铜、镍主要以硫化物形态存在于炉渣中,还有部分存在于铁镁橄榄石相中。     

基于神经网络的电缆温度监测和寿命估计

冶炼生产中,多条大电流运行的电缆集中敷设在电缆沟中,由于环境温度高和接头质量下降,容易导致电缆老化和接头烧毁事故。针对冶炼生产实际,设计电缆温度监测系统,选用半导体测温元件AD590监测电缆实际运行温度,由SC1128组成的电力通信模块传送信号,系统简单实用。应用神经网络技术分析电缆运行温度,诊断、预测故障,计算电缆使用寿命,优化电缆更换周期。     

转炉冶炼特殊钢工艺简述

简要介绍了转炉与电炉冶炼特殊钢工艺的不同之处,并探讨了转炉生产特殊钢的流程和关键技术。     

含固相铜冶炼渣的黏度计算及其应用

利用Roscoe方程,结合FactSage的多元多相平衡计算和纯液相渣黏度计算功能可对含固相熔渣的黏度进行计算.本研究针对基于铜冶炼渣的FeO-SiO2-Fe3O4-CaO-Al2O3-MgO系,首先根据相似炉渣的黏度测定值对Roscoe方程中的参数进行拟合,同时验证了该方法在计算所研究体系时的准确性.基于所得的计算模型考察不同组分含量对平衡相组成及黏度的影响规律,并总结获得合理的渣型配比.当炉渣中各组分的质量分数分别控制在FeO 40％～60％、SiO225％ ～ 40％、Fe3O40％～15％、CaO 0％ ～ 10％、A12O30％～8％和MgO 0％ ～4％时,可在冶炼过程中得到流动性较好、固体量较少的熔渣.     

铝熔炼工艺特点及其污染治理

介绍了铝的物理与化学性能,阐述了铝熔炼工艺特点及其污染治理。