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硫铁矿煤渣湿法制备铁系产品的原理和途径分析 总被引:7,自引:0,他引:7
本文叙述了硫铁矿烧渣的化学成分和物相,以及酸浸还原烧渣提取铁的基本原理。论述了硫铁硫烧渣湿法制备铁盐,铁氧化物颜料,铁基磁粉以及铁粉等铁系产品的原理,并对铁系产品的途径进行了分析。 相似文献
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《环境工程学报》2015,(8)
采用电石渣制备成圆球型反应料,通过多级处理式实验装置对煤矿酸性废水进行处理。研究了在不曝气和曝气2组实验情况下处理出水的pH变化特征和反应料去除铁、锰的效果。结果表明,在不曝气组,当水力停留时间(HRT)为17.6 h,总出水pH值由进水2.84~2.95提高到4.17~11.88,总出水铁平均浓度80.43 mg/L,平均去除率为72.87%,锰平均浓度6.16 mg/L,平均去除率48.21%。在曝气组,当HRT为17.6 h,曝气量为10.50 L/min,总出水pH值由进水2.84~3.00提高到9.10~11.87,总出水铁平均浓度0.03 mg/L,平均去除率为99.99%,锰平均浓度0.14 mg/L,平均去除率为98.72%。因此,利用圆球型电石渣反应料去除煤矿酸性废水中的铁、锰以及提高pH有很好的效果。 相似文献
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为了实现钢材酸洗废液的资源化,能够同时回收盐酸和铁盐,提出了加盐蒸馏回收盐酸与蒸馏母液制备聚铁混凝剂两段组合工艺相结合的技术。实验对质量浓度为9.28%的实际盐酸废液进行了研究,考察了添加盐的种类、盐的投加量和蒸馏量等因素对再生盐酸回收效果和聚铁混凝剂溶液混凝效果的影响。研究表明,氯盐可以明显改变氯化氢、水的相对挥发度,当CaCl2投加量为1 mol/L,体积蒸馏量在30%时,为此工艺的最佳条件。在此工艺条件下,再生盐酸质量浓度约22.3%;蒸馏母液制备得到的聚铁混凝剂溶液应用实验表明,对印染废水脱色效果良好。此工艺不仅实现了酸洗废液中残酸和铁离子的资源化利用,而且达到酸洗废液的零排放。 相似文献
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利用工业废铁盐和人造金红石废母液制取铁黄颜料不但治理了工业废弃物,防止了环境污染,而且获得了有价值的产品,是综合利用的好途径。重庆大学经过试验研究,采用低温湿法氧化工艺路线,在国内首创了用废氯化铁溶液制作氧化铁黄颜料工艺;用氧化镁作中和剂,在生成氧化铁黄的同时联产卤水,使这些废弃物得到充分利用,不产生二次污染。通过综合利用达到的主要指标:铁的利用率 90%氧化中和时间 48小时主设备产量 100克/米~3·日铁黄产品质量、卤水质量均符合用户要求。 相似文献
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生产活性白土的污染最小化技术 总被引:2,自引:0,他引:2
在生产活性白中,用低浓度的酸活化膨胀土,循环使用废酸和洗涤水,分级洗涤产品和生产活性白的同时副产硫酸铝等污染最小化技术。处理了废水使硫酸的利用率达到94%,降低了生产成本。 相似文献
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本文介绍了石灰、电石渣及CaCl2 分别与聚丙烯酰胺联用处理煤泥水的对比试验研究结果。结果表明 ,三种方法对煤泥水均有较好的处理效果 ,其中CaCl2 法效果最好 ,但药剂费也最高 ,石灰法和电石渣法处理效果相差不大 ,但电石渣法药剂费较低。 相似文献
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Peter F. Castillo Ramu M. Rao Joseph A. Liuzzo 《Journal of environmental science and health. Part. B》2013,48(4):471-489
Abstract The primary objective of this investigation was to determine the feasibility of using acid activated clays to clarify menhaden stickwater effluent. Experiments, such as physical and chemical properties determinations, effect of changes in pH and temperature and coagulation, and coagulation followed by clay treatment were also performed to study the separation of solids in stickwater. Analysis of the stickwater showed that it contained 4.5% crude protein, 1.4% crude fat, 6.5% total solids, 1.13% ash and 93.1% water. At a wavelength of 575 um, the sample absorbed all the light and the percent transmittance was zero. When diluted 1:100 the percent transmittance was 0.39 at the same wavelength. Measured at 25°C the sample had a viscosity of 9.0 centipoises. The results showed that the precipitation of fat increased with increasing temperatures, while the reverse was true for protein. A pH of 4.0 gave the maximum clarification at all temperatures employed. The viscosity decreased at pH values above and below the original pH of the sample. Among the four different acid activated clays used in this study (trade names Supact‐150, Impact‐150, Impact‐12 and Impact‐1OORR), Impact‐150 was the most effective in protein and fat precipitation, and the degree of separation of these components increased by treating stickwater with a coagulant (aluminum sulfate) prior to treatment with acid activated clay. 相似文献
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新型人工快速渗滤系统处理村镇污水工艺参数优化 总被引:1,自引:1,他引:0
在巢湖双桥河建立了中试规模的人工快速渗滤系统(CRI),系统经过一个月左右启动期后挂膜成功。通过考察不同湿干比条件下CODMn、TP、TN和NH3-N的去除效果,确定系统湿干比为1 d∶2 d,水力负荷周期为3 d。TP、TN和NH3-N在1.0 m/d的水力负荷条件下能够达到最佳的处理效果,特别是TN;而CODMn在1.3 m/d取得最佳的去除效果。综合考虑脱氮除磷和有机污染物的去除,选取水力负荷为1.0 m/d可得到最佳的出水水质。综合4种污染物的去除特点,特别考虑到对TN去除的需要,同时兼顾工程成本,填料厚度确定为1.2~1.5 m之间为最佳。选取生物陶粒、钢渣、活性炭和天然沸石为渗滤介质,研究结果表明,从去除有机污染物和TP角度考虑,选取活性炭和钢渣可达到较好的去除效果,其中钢渣对TP去除效果更佳;而活性炭具有其他4种填料不可替代的脱氮效果。以上工艺组合形式的确定将为巢湖流域CRI系统的推广提供科学依据和数据支持。 相似文献
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废弃油基钻井液提取柴油剩余废弃物无害化处理研究 总被引:1,自引:0,他引:1
针对废弃油基钻井液中柴油回收过程产生的泥渣、废水、废白土和酸碱废渣具有高色度、高pH、高COD和高石油类的特点,通过优化实验得出了一步法无害化处理废弃混合物的最佳固化配方:水泥和粉煤灰加量分别为12.5%,激活剂SG加量1.5%,促凝剂LSL加量1.5%,石灰加量1%。在最佳固化配方下,固化体浸出液的各主要污染指标都符合《污水综合排放标准》(GB 8978-1996)一级标准,固化成本约100元/m3,与分别处理废渣、废液相比,其处理成本可降低约20%。 相似文献
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本文针对我国中小水泥企业立窑生产工艺现状,提出一套简洁实用、操作性较强的清洁生产评估体系,通过对企业现状和基本工艺数据的采集,分析企业在不同方面的清洁生产潜力,明确企业的国内外地位,为企业领导的决策提供依据。 相似文献
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The environmental fate of ethylenediaminetetraacetic acid (EDTA) has been extensively studied, while much less is known about the environmental behaviour of diethylenetriaminepentaacetic acid (DTPA). In this study, it was confirmed that DTPA is persistent toward biodegradation. The biodegradability of DTPA was investigated in the absence and in the presence of Fe(III) by using CO2 evolution test and Manometric respirometry test. The CO2 evolution and oxygen uptake of iron-free (DTPA was added as free acid) and Fe(III)DTPA were less than in inoculum blank. Possible inhibitor effect was analysed by testing biodegradation of sodium benzoate with and without iron-free or Fe(III)DTPA in the Manometric respirometry test. Only slight inhibition was observed when DTPA was added as free acid. Photodegradation of iron-free DTPA and Fe(III)-DTPA complex was studied by using sunlight and UV radiation at the range 315-400 nm emitted by black light lamps. The results indicate that DTPA added as free acid degrades photochemically in humic lake water. Fe(III)DTPA was shown to be very photolabile in humic lake water in the summer; the photochemical half-life was below one hour. Photodegradation products were identified by the mass spectrometric technique (GC-MS). It was shown that photodegradation of Fe(III)DTPA does not result in total mineralization of the compound. Diethylenetriaminetetraacetic acid, diethylenetriaminetriacetic acid, ethylenediaminetriacetic acid, N,N'- and/or N,N-ethylenediaminediacetic acid, iminodiacetate, ethylenediaminemonoacetic acid and glycine were identified as photodegradation products of Fe(III)DTPA. Based on these observations, we propose a photodegradation pathway for Fe(III)DTPA. 相似文献