推行清洁工艺遏制铅冶炼的职业危害

近年来 ,世界各国为遏制铅的职业危害所制定的安全标准 (TLV)愈来愈严格 ,从而迫使一些炼铅厂采用清洁工艺———硫化铅精矿直接熔炼取代传统法炼铅 ,在提高经济效益的同时 ,获得了良好的环境效益。由于投资方面的困难 ,普遍采用直接熔炼方法还待将来 ,国内炼铅厂在加强防尘密闭、完善和改进现有工艺、防止含铅烟尘在车间的弥散、控制铅和SO2等职业危害取得了许多成功经验     

处理铅阳极泥后的高铋渣料直接法生产锑白的新工艺

本文阐述了铅阳极泥回收金银后的高铋渣料(Bi≥2%)直接法生产锑白的新工艺,降低了锑白的生产成本,为高铋锑物料中锑的回收提供了新的途径.     

Precipitation of antimony from the solution of sodium thioantimonite by air oxidation in the presence of catalytic agents

The behavior of antimony oxidation in the solution of sodium thioantimonite was studied in the presence of catalytic agents. The catalytic effects of the respective addition of cupric sulfate, sodium tartrate, potassium permanganate, phenol, 1,2-dihydroxybenzene and their combination on the oxidation of sodium thioantimonite were investigated. A pilot test was carried out. The results show that the respective use of sodium tartrate, cupric sulfate, potassium permanganate, phenol and 1,2-dihydroxybenzene have little catalytic effect on the oxidation of sodium thioantimonite. However there exists obvious catalytic oxidation by the combination of 0.25 g/L 1,2-dihydroxybenzene, 0.5 g/L potassium permanganate and 1.0 g/L phenol. Moreover, high blast intensity, the increase of temperature and NaOH concentration favor the oxidation of antimony. The oxidation process of antimony has such advantages as quick reaction and low operation costs. The results of the pilot test are consistent with those of laboratory experiments.     

推行清洁工艺 遏制铅冶炼的职业危害

近年来，世界各国为遏制铅的职业危害所制定的安全标准(TLV)愈来愈严格，从而迫使一些炼铅厂采用清洁工艺——硫化铅精矿直接熔炼取代传统法炼铅，在提高经济效益的同时，获得了良好的环境效益。由于投资方面的困难，普遍采用直接熔炼方法还待将来，国内炼铅厂在加强防尘密闭、完善和改进现有工艺、防止含铅烟尘在车间的弥散、控制铅和SO2等职业危害取得了许多成功经验。     

反应条件对水热法制备纳米ATO粉体形貌和电性能的影响

以SnCl4·5H2O和SbCl3为原料,采用水热法制备出了纳米级锑掺杂二氧化锡(ATO)导电微粉,运用XRD和TEM等测试手段对粉体进行了表征,比较系统地研究了掺杂量,共沉淀温度,溶液pH值,水热时间、温度和表面活性剂对粉体粒度、形貌和电性能的影响规律.研究表明,合成的ATO粉体分散性较好、导电性能优异,粒径在10nm左右,具有金红石型结构.在ATO纳米导电粉的制备过程中,前驱体制备温度对其性能有很大影响,当共沉淀温度在40-50℃时制得的粉体导电性能最佳.水热条件对粉体的形貌、粒度和导电性也有较大的影响,在200℃,4h,pH=2～4条件下可以制得导电性能良好的ATO粉体,所添加的表面活性剂可以改善粉体的粒径和分散性能,但对粉体的导电性影响极小.掺入Sb3 的量对载流子的迁移率有很大的影响,在掺杂浓度为4～5%左右可制得导电性极佳的纳米ATO粉体.     

Sodium sulfide leaching of low-grade jamesonite concentrate in production of sodium pyroantimoniate

Sodium sulfide leaching of a low-grade jamesonite concentrate in the production of sodium pyroantimoniate through the air oxidation process and the influencing factors on the leaching rate of antimony were investigated.In order to decrease the consumption of sodium sulfide and increase the concentration of antimony in the leaching solution, two-stage leaching of jamesonite concentrate and combination leaching of high-grade stibnite concentrate and jamesonite concentrate were used. The experimental results show that the consumptions of sodium sulfide for the two-stage leaching process and the combination leaching process are decreased by 20% and 60% compared to those of one-stage leaching process respectively. The final concentrations of antimony in the leaching solutions of both processes are above 100g/L.     

高铋渣料直接法生产锑白的新工艺

阐述了铅阳极泥回收金银后的高铋渣料直接法生产锑白的新工艺.该工艺降低了锑白的生产成本,为高铋锑物料中锑的回收提供了新的途径.     

高铋渣料直接法生产锑白的新工艺

阐述了铅阳极泥回收金银后的高铋渣料直接法生产锑白的新工艺。该工艺降低了锑白的生产成本，为高铋锑物料中锑的回收提供了新的途径。     

制备工艺对纳米级铟锡氧化物(ITO)形貌和电性能的影响

以SnCl4·5H2O、In和浓盐酸为原料,采用化学共沉淀法制备出了纳米级锡掺杂氧化铟(ITO)导电微粉,系统地研究了掺杂量,共沉淀温度,pH值,热处理时间、温度对粉体粒度、形貌和电性能的影响规律。研究表明,合成的ITO粉体分散性较好、导电性能优异,粒径在40nm左右具有立方铁锰矿结构。在ITO纳米导电粉的制备过程中,共沉淀温度和滴定终点pH值对其形貌和性能有很大影响,当共沉淀温度在60℃左右,pH=6时制得的粉体性能最佳。煅烧条件对粉体的形貌、粒度和导电性也有较大的影响,在700℃,4h条件下可以制得导电性能良好,结晶完好,粒度分布均匀的ITO粉体。掺入Sn(Ⅳ)的量对载流子的迁移率有很大的影响,在掺杂浓度为10%左右可制得导电性极佳的纳米ITO粉体。