共查询到20条相似文献,搜索用时 156 毫秒
1.
对从锌精矿焙烧电尘中回收镉的工艺进行了研究,比较了水浸、酸浸及氧化酸浸3种浸镉方法,指出氧化酸浸-除砷-置换-压团-熔铸是回收镉的最佳流程,用这种方法处理含镉电尘,镉的浸出率大于90%,粗镉品位99.10%。 相似文献
2.
以含锗、铟的锌精炼脱锌氧化硬锌渣为原料,采用氧压酸浸工艺选择性回收其中的锗和铟,并对锗、铟、铜、锡、锑等元素的溶出行为进行了研究。结果表明,锗、铟及锌溶出率分别达到95%、91%及98%以上,大部分铅、硅、锡、锑等则留于残渣中。 相似文献
3.
4.
以国内某湿法炼锌厂产出的富锗湿法炼锌渣为原料,采用氧压酸浸方法强化浸出物料中的锌和锗,利用氧压酸浸条件促进难溶解硫化锌等化合物的破坏与锌的溶出,利用高温反应促进含锗化合物的解离及锗的溶出,提高锌和锗的浸出率。考察了浸出温度、氧压、硫酸浓度、浸出时间等因素对锌和锗浸出率的影响规律。研究发现提高反应温度和酸度,以及增大氧压均有利于提高锌和锗的浸出率。在初始硫酸浓度为100g/L、反应温度为130℃、氧压1.0MPa、浸出时间为150min、液固比为3:1、搅拌速度为500r/min的条件下,锌的浸出率达到90.5%,锗浸出率达到80.1%。研究结果表明氧压酸浸方法可以破坏物料中的难溶解锌锗化合物,实现锌和锗的高效浸出,以及铅的富集。 相似文献
5.
6.
为了解决锌冶炼铜渣综合利用的问题,研究了铜渣综合回收有价金属工艺,在生产一级品五水硫酸铜同时回收铅、锌、银、锗等有价金属。采用的工艺流程为:铜渣通过氧压酸浸使铜、锌、锗进入浸出液,铅、银留在浸出渣中,浸出渣送铅冶炼系统回收铅、银,浸出液经过冷却萃取回收锗、萃余液盐析结晶、逆流洗涤结晶、烘干产出五水硫酸铜产品,锌、镉在结晶母液富集之后返回锌冶炼系统回收,实现了资源的最大化综合回收。铜、铅、银、锌、锗回收率分别达到 96.87%、99.9%、97.88%、93.61%、61.72%。 相似文献
7.
8.
9.
10.
采用氧压酸浸处理硫化铜镍精矿.结果表明铜、镍的浸出率均随着温度升高、时间延长呈现线性上升的趋势,铜、镍的最高浸出率分别为98.53%、97.69%,经氧压酸浸,硫化铜镍精矿中的部分铁及脉石矿物浸出进入溶液中,将精矿中的贵金属富集到95g/t左右.动力学试验研究表明,硫化铜镍精矿氧压酸浸过程中铜、镍的浸出表观活化能分别为... 相似文献
11.
炼钢电弧炉工艺过程的仿真,预测,诊断与优化 总被引:1,自引:0,他引:1
介绍了以计算机为工具,对炼钢电弧炉工艺过程进行仿真与优化的一些应用,包括:炼钢电弧炉工艺指标预测,诊断和优化,竖式电弧炉废钢预热过程仿真,钢液中磷,硫浓度的预测,直流电弧炉电磁偏弧和控制弧仿真以及电弧炉操作监控仿真等。 相似文献
12.
Problem solving in clinical nursing practice is the essence of good care delivery. This paper gives an overview of a research study which identified the cognitive problem solving process nurses use while delivering care. The study was conducted in the clinical setting and used a qualitative research methodology of observation, followed by in-depth semi-structured interview. The analysis of the study revealed diagnostic reasoning is the process used by clinicians. Information regarding the differences between novices and experts is offered as topics for discussion throughout the paper, and recommendations for changes to educational processes are made. 相似文献
13.
14.
铟锡氧化物薄膜的生产,应用与开发 总被引:4,自引:1,他引:4
文友 《稀有金属与硬质合金》1997,(3):56-59
介绍了铟锡氧化物(ITO)薄膜的特性、主要生产工艺及其在汽车、宇航、建筑、电子等领域的应用。并对该材料生产工艺及产品市场的发展前景进行了展望。 相似文献
15.
某金矿石浮选-硫脲炭浸综合回收金银铜硫的工艺试验研究 总被引:5,自引:0,他引:5
阐述了采用浮选--硫脲炭浸一步法处理铜硫砷含量高的某难选金矿石的工艺。工艺的试验结果体现了联合流程处理难选金矿石的优势。 相似文献
16.
JD Featherstone 《Canadian Metallurgical Quarterly》1994,7(5):271-274
This paper reviews the probable mechanism of dental caries and the role of fluoride in the inhibition or reversal of that process. The initial stages of root caries are comparable to enamel caries, being the acid dissolution of mineral resulting from acids generated by bacterial metabolism. The fermentation of carbohydrates by oral bacteria including mutans streptococci and lactobacilli initiate the root caries process, removing mineral from among the organic matrix which is primarily composed of collagen. Subsequent to this demineralization, the organic material can be further broken down by bacterial enzymes. Fluoride inhibits mineral loss during the acid dissolution process and enhances remineralization in a similar manner to that which occurs in dental enamel. 相似文献
17.
18.
《钢铁冶炼》2013,40(3):273-278
AbstractThe temperature profile inside the submerged arc furnace is a critical factor influencing the process efficiency in the production of ferroalloys. The effect of a number of critical process parameters such as the charge preheat, bed porosity, and charge chemistry on the temperature profile was analysed by means of a mathematical model. It was found that preheating of the charge had a significant influence on the profile. Higher bed porosity tended to bring the various isotherms closer to the hearth of the furnace. Low bed porosity tended to expand the high temperature zone of the furnace. This can lead to diminished process efficiency under certain circumstances. The charge chemistry also altered the profile depending on the type of changes introduced. The influence of these parameters and their significance for the operation of the process are discussed in this paper. 相似文献
19.
对宝钢原料场三电控制系统所使用的控制技术、基本结构和流程PLC系统等进行了阐述,并分析了流程 PLC系统存在的必要性和发展趋势。 相似文献
20.