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本文对电镀环保工作中所谓的自然封闭循环、无排放技术,提出了自己的看法。由于电镀生产过程中,杂质的积累是不可避免的,本文从6个方面详细论述了杂质积累的必然性,包括光亮剂的分解,槽液成分的变性,如氰化物变成碳酸盐,焦磷酸盐变成正磷酸盐,阳极泥渣的带入,副反应-价铜的生成,镀件的散落和溶解等。这些杂质对电镀二艺和镀层质量都是极端有害的,不清除它,电镀生产就无法正常进行。要把这些电镀三废消化于电镀工艺过程中,从而达到自然封闭循环和无排放是不可能的事。至于逆流清洗技术,是节约用水的一项重要措施,也是行之有效的。但是压缩清洗水量使它等于蒸发水量并不就是自然封闭循环和无排放技术。这是必需要分清楚的。 相似文献
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我厂黄磷电炉始建于1960年,规模800吨/年,现在发展到了4000吨/年。三十多年来,我厂又以黄磷为原料发展了赤磷、工业磷酸一纳、磷酸三钠、三聚磷酸钠、六偏磷酸钠、磷酸二氢钾等产品,远销世界十多个国 相似文献
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本文介绍了采用稀酸封闭循环工艺处理硫酸生产废水。工程实践表明:该工艺的投入运行实现了生产废水全部循环利用,有效地解决了废水污染环境问题,同时降低了硫酸生产成本,取得了显著的经济效益、环境效益和社会效益。 相似文献
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介绍了弘腾公司开发的闭路循环啧雾干燥机系统的组成、技术创新要点、工艺流程、适用场合、企业标准及应用实例。 相似文献
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对流化振动连续造粒机内的流化机理进行了分析。得出流态化时床内粉料浓度的分布特征,对结构设计具有实际意义,对喷雾造粒过程中两种不同的颗粒成粒机理的分析。可以指导易溶颗粒及颗粒包衣的生产。 相似文献
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《Drying Technology》2013,31(7):1273-1289
Abstract This work investigates the performance of a spray dryer for tomato powder preparation by spray drying of tomato pulp. Samples of tomato pulp with a 14% constant total solids concentration were used, and a pilot scale spray dryer (Buchi, B-191) with cocurrent operation and a two-fluid nozzle atomizer was employed for the spray drying process. Twenty-four different experiments were conducted keeping constant the feed rate, the feed temperature, and the atomizer pressure, and varying the compressed air flow rate, the flow rate of drying rate, and the air inlet temperature. In each experiment the air outlet temperature was recorded. Data for the residue remaining in the chamber and cyclone walls was gathered and two types of efficiencies were calculated as an indication of the spray dryer performance. Analysis of experimental data yielded correlations between residue accumulation and the variable operating conditions. The same operating parameters had a great influence on the air outlet temperature whereas temperature deviations were observed comparing measured air outlet temperatures with corresponding outlet adiabatic saturation temperatures. 相似文献
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This work investigates the performance of a spray dryer for tomato powder preparation by spray drying of tomato pulp. Samples of tomato pulp with a 14% constant total solids concentration were used, and a pilot scale spray dryer (Buchi, B-191) with cocurrent operation and a two-fluid nozzle atomizer was employed for the spray drying process. Twenty-four different experiments were conducted keeping constant the feed rate, the feed temperature, and the atomizer pressure, and varying the compressed air flow rate, the flow rate of drying rate, and the air inlet temperature. In each experiment the air outlet temperature was recorded. Data for the residue remaining in the chamber and cyclone walls was gathered and two types of efficiencies were calculated as an indication of the spray dryer performance. Analysis of experimental data yielded correlations between residue accumulation and the variable operating conditions. The same operating parameters had a great influence on the air outlet temperature whereas temperature deviations were observed comparing measured air outlet temperatures with corresponding outlet adiabatic saturation temperatures. 相似文献
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以六水合硝酸锌为原料,采用超声喷雾热解法制备了Zn O超细粉体。采用X射线衍射仪(XRD),扫描电子显微镜(SEM)等表征手段对所制备产物进行表征,并探讨了反应温度、前驱体浓度对Zn O尺寸和形貌的影响。结果表明:在反应温度为800℃、前驱体浓度为0.4 mol/L的条件下,所得到的产物粒径分布较窄且颗粒的球形度较好。 相似文献
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通过对三种不同锥体内粉体物料的运动形式及粒度分布的研究,揭示了粉体物料在回转锥体内运动形式和规律及锥体内粉体物料的粒度分布性质,得出了属锥具有一定的分级作用,在回转锥体内粉体物料存在“二次偏析”及“返混现象”的结论;在全内返料内分级及喷浆造粒干燥机中推荐采用37°角锥体且在锥小端设置挡环。 相似文献
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在复合肥的生产过程中,用流动注射分析测定磷矿,磷石膏,磷酸中的五氧化二磷,该方法制样简单,分析速度快,结果准确。 相似文献