On the Inverstigation of Hot-Press Acid Leaching Treament to Copper Pyrites Residues

脱硫是目前重有色金属冶炼过程中不可避免的问题。本文在综合分析大量文献的基础上，概述了重有色金属冶炼中硫的脱除回收工艺的现状与发展。针对国内某矿山黄铜矿热压酸浸渣的处理问题，进行了黄铜矿热压酸浸渣中提取元素硫的工艺研究。本课题旨在通过实验研究，结合实际生产环境的要求，筛选一种操作简单、过程安全、提硫效率高的工艺方法来对黄铜矿热压酸浸渣进行处理，以回收矿渣中的硫磺。通过对物理法、有机溶剂法、无机溶剂法的实验比较，综合考虑酸浸渣的组成和成分，以及各种工艺方法的优缺点、安全性和经济性。选用硫化铵法对此矿渣进行处理，并对其提硫过程进行了分析，表征，研究。本文以提高硫的浸出率为目标，根据核收缩模型，通过大...Desulfuration is an unavoidable and critical issue in heavy nonferrous metallurgy. On the review of current research and technology progresses, a technology to extract sulfur from the residue of copper pyrites leached by acid was studied in this work.Based on the analysis of real process operation and investigation of lab scale experiments, the work aims to develop a sulfur extraction process for ...学位：工学硕士院系专业：化学化工学院化学工程与生物工程系_化学工程学号：2005130175

Process technology on recovery of sulphur from copper-bearing gold concentrate by using kerosene method

某含铜金精矿尾矿浸铜渣中含有质量分数约15%的单质硫,严重影响后续提金过程的氰化效果。实验进行了以煤油为溶剂的提硫过程研究,考察溶硫时间、温度、液固质量比等因素。实验表明:采用煤油二段浸取法,当工艺条件为液固质量比2—3,温度140℃,加热40MIn,单质硫的回收率为98.4%,纯度达99%以上。对硫化矿处理过程尾矿中硫的回收,采用煤油为溶媒,是一种有效、环保的清洁生产过程,可以提高贵金属及伴生硫的综合回收率,易于工业应用。In the residues of copper-bearing gold concentrate there is mass fraction 15% sulfur which influences the effect of latish cyanogenation.The experiment was carried out with kerosene as solvent in sulfur removal process and the effect of leaching temperature and time,the mass ratio of kerosene to residue (liquid to solid) on the experiment was investigated.The results show that when the mass ratio of kerosene to residue is 2-3,heating temperature is 140 ℃,heating time is 40 min,the recovery efficiency of sulfur can be more than 98.4%,the purity of sulfur can be more than 99%.The new hydrometallurgical method which uses kerosene as solvent is an effective and clean process.It can improve comprehensive recovery efficiency of precious metals and sulfur,and is easy for industrialization without pollution

Engineering practice of the treatment of wastewater from flexible printed circuit board factories

介绍了厦门某电子科技有限公司废水处理工程实例。针对该线路板厂废水来源的不同,依据分类收集、先预处理再综合处理的原则对废水进行合理的细化分类,对不同的水质进行不同的物化处理。工程试车结果表明,采用本工艺路线处理后的柔性印制电路板废水出水水质达到或优于GB8978—1996一级排放标准。An example of the engineering practice of the wastewater treatment at an electronic technology company in Xiamen is introduced. Considering the different characteristics of wastewater sources at the circuit board factory, and based on classifying the collections, the principle of classifying the wastewater is followed and the wastewater is treated properly and detailedly by pre-treatment firstly and then by comprehensive treatment. Wastewater with different water quality is treated by different physicochemical treatment. The practice results show that when flexible printed circuit board wastewater is treated by this process,the effluent water quality meets or superior to the requirement of the first class of the standard,GB 8978—1996

论河西走廊地区实施生态保护修复的重要性

河西走廊地区处于北方防沙带功能区的关键位置，目前，正面临着土地沙化、水资源枯竭、生物多样性大幅度降低等严峻的生态问题。文中以位于河西走廊西端的酒泉为例，从生态区位、区域地位、实施山水工程的必要性和意义来论述在河西走廊地区实施山水林田湖草生态保护修复工程的重要性。</jats:p

Technical Study on Recovery of Sulfur from Copper Pyrites Residue Leached by Acid

对黄铜矿酸浸渣中硫磺回收工艺进行研究,分析了浸取温度、反应时间、液固比、热分解温度、热分解时间等因素对硫磺回收率的影响.实验结果表明,在(NH4)2S浓度为2.0mol/L、溶硫温度30℃、反应时间60min、液固比8∶1、热分解温度90℃、时间90min的条件下,采用硫化铵法回收硫磺,溶硫率达到96%左右,热分解提硫率达到94%以上.There is about 15% sulphur in the residue of copper pyrites.Low cost process of extracting sulfur from the residue is important not only the impact of commercial consideration but also critical for the environment.In this work,the operation conditions such as leaching temperature,reaction time,the ratio of ammonium sulfide to solid residue,and duration and temperature of thermal decomposition for extracting sulfur from residue of copper pyrites were investigated in the use of ammonium sulfite solution.The results show that the process can extract sulfur from leaching residue in the measurement of achieving about 96% leaching efficiency extraction at the conditions of ammonium sulfide concentration 2.0 mol/L,temperature 30℃,reaction time 60 min,ratio of ammonium sulfide to solid residue 8∶1.And the thermal decomposition can reach 94% at temperature of thermal decomposition 90℃,and duration of thermal decomposition 90 min

石油基中间相沥青的研制

以石油基中温沥青为原料,经过热聚合-氢化-热处理制备中间相含量大于80%的广域流线型的中间相沥青,对处理过程中沥青的组分和结构变化进行了表征,探讨了低温长时间和高温短时间处理对中间相沥青形态的影响规律.结果表明,原料通过热聚合,沥青中的甲苯不溶物含量和芳环数提高;再经过加氢改性,沥青分子中的脂环烃增加,流动性改善;最后经高温短时间或低温长时间热处理形成含侧链或环烷结构的稠环芳烃分子,低温长时间处理更有利于中间相分子充分发展,易获得广域流线型的中间相

石油基中间相沥青的研制

以石油基中温沥青为原料,经过热聚合-氢化-热处理制备中间相含量大于80%的广域流线型的中间相沥青,对处理过程中沥青的组分和结构变化进行了表征,探讨了低温长时间和高温短时间处理对中间相沥青形态的影响规律.结果表明,原料通过热聚合,沥青中的甲苯不溶物含量和芳环数提高;再经过加氢改性,沥青分子中的脂环烃增加,流动性改善;最后经高温短时间或低温长时间热处理形成含侧链或环烷结构的稠环芳烃分子,低温长时间处理更有利于中间相分子充分发展,易获得广域流线型的中间相

影响SmCo_5@FeCo软磁相包覆效果的关键因素

为获得良好磁性耦合和高磁能积的纳米复合永磁粉,系统研究了化学法包覆软磁相FeCo的关键影响因素。研究发现,在制备纳米复合磁粉SmCo_5@FeCo过程中表面活性剂的分子量、反应的加热方式、SmCo_5磁粉的预处理时间以及化学包覆反应的时间等对软磁相的形貌、尺寸、分布,以及对复合粉体的磁性能都有重要影响。表面活性剂分子量的调控和加热方式的改善可使相同量软磁相前躯物投入时形成更致密的高含量包覆层。经过酸洗预处理的SmCo_5粉更有利于软磁相包覆,酸洗时间0.5 h为佳。此结果对制备超高性能纳米复合永磁粉体及块体材料具有重要意义

石油基中间相沥青的研制

以石油基中温沥青为原料,经过热聚合-氢化-热处理制备中间相含量大于80%的广域流线型的中间相沥青,对处理过程中沥青的组分和结构变化进行了表征,探讨了低温长时间和高温短时间处理对中间相沥青形态的影响规律.结果表明,原料通过热聚合,沥青中的甲苯不溶物含量和芳环数提高;再经过加氢改性,沥青分子中的脂环烃增加,流动性改善;最后经高温短时间或低温长时间热处理形成含侧链或环烷结构的稠环芳烃分子,低温长时间处理更有利于中间相分子充分发展,易获得广域流线型的中间相.</p