共查询到20条相似文献,搜索用时 187 毫秒
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意大利SIR公司计划建造一工业生产装置生产土壤调理剂Glotwl,该产品是由二氧化钛生产中的副产硫酸亚铁与石灰干混,反应生成氢氧化亚铁和硫酸钙,再用热空气处理此混合物,氢氧化亚铁被氧化成氢氧化铁,然后将硫酸喷入混合物,氢氧化铁则转变为硫酸铁,最终的产品含43%的硫酸铁、34%的硫酸钙、2.5%的硫酸镁和2.5%的氧化铁。 相似文献
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副产硫酸亚铁制备电池级草酸亚铁的研究 总被引:1,自引:0,他引:1
以钛白副产硫酸亚铁为原料制备出电池级草酸亚铁。研究了除杂、沉淀、转化反应过程中反应温度、反应时间、硫酸亚铁浓度以及反应pH等因素对产品质量的影响,并得到了优惠工艺条件。结果表明:在反应温度为
95 ℃、反应时间为6 h的条件下用铁粉对硫酸亚铁溶液除杂,得到纯净硫酸亚铁溶液;在反应温度为40 ℃、铁(Ⅱ)质量浓度为90 g/L的条件下用氨水沉淀,再用草酸于反应时间为60 min、pH=2.0条件下将氢氧化亚铁转化成草酸亚铁,制备出了纯度大于99.5%、粒径小于3.0 μm、杂质含量低的电池级草酸亚铁。为解决钛白副产硫酸亚铁的综合利用提供了一条有效的途径。 相似文献
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在浸没式循环撞击流反应器中,以氨水为沉淀剂,用七水合硫酸亚铁和六水合三氯化铁为原料,采用共沉淀法制备了纳米四氧化三铁粒子。考察了搅拌转速、亚铁与三价铁物质的量比、反应温度和溶液pH对所得纳米四氧化三铁的分散性和粒径的影响。采用傅里叶红外光谱仪、透射电镜、X射线衍射仪等对制得的纳米粒子的结构和性能进行了表征。结果表明:用撞击流反应器制备纳米四氧化三铁粒子的最佳工艺条件:亚铁与三价铁物质的量比为1 ∶1,反应温度为40 ℃,搅拌转速为1 600 r/min,以氨水作沉淀剂,最佳pH控制在11.0左右。在上述条件下,可以制备出分散性好、纯度高、平均粒径为10 nm的四氧化三铁粒子。 相似文献
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钛白粉生产过程中硫酸亚铁是其主要的副产品,硫酸亚铁的产生量大,回收利用率低成了制约钛白粉生产的"瓶颈"。文章目的通过采用投加一定量的氯化钙然后调节pH来回收铁的方法对钛白粉生产过程中的副产品硫酸亚铁进行综合利用的实验分析。通过研究发现:氯化钙与硫酸亚铁反应过程中在一定的搅拌强度反应一段时间后,氯化钙的最佳投加量为Ca2+与SO42-的摩尔比1.3;氢氧化钙的最佳投加量OH-与Fe2+物质的量之比2.4,能够将硫酸亚铁中的铁全部转化成氢氧化铁,其中氯化钙溶液在整个系统中循环利用。 相似文献
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介绍了钛白副产硫酸亚铁的来源以及组成,综述了近几年来副产硫酸亚铁的综合利用情况,包括制备高纯二氧化锰、处理含铬废水、精制硫酸亚铁、制备聚合硫酸铁、制备氧化铁颜料等,变废为宝,获得一定的经济效益和社会效益。 相似文献
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硫酸法钛白粉排放大量FeSO4.7H2O废渣,目前主要用其生产铁黑、铁黄、铁红等铁系颜料及FeSO4.H2O饲料。但由于铁系颜料及FeSO4.H2O饲料的国内、国际市场容量有限,FeSO4.7H2O废渣的处理已成为我国硫酸法钛白粉快速发展的瓶颈之一。聚合硫酸铁是一种新型无机高分子絮凝剂,广泛用于各种工业污水的混凝净化处理,市场容量很大。利用钛白粉废渣作为原料,经过精制,将废渣所含的氧化钛回收返回钛白粉生产线,利用高效、节能、成熟的工装设备,采用催化及直接氧化法生产高质量的液体聚合硫酸铁,具有很好的经济效益和环境效益。 相似文献
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An economic analysis was carried out for three different recycle/recovery options for waste pickling liquors from hydrochloric acid pickling baths in an existing small-mid scale plant presently neutralizing and discarding waste pickling liquors. The analysis was based on process synthesis and design, which were completed by using real plant data along with some experimental work. Three basic schemes were studied: the addition of metallic iron to convert unused hydrochloric acid to ferrous chloride recovery by evaporation and recycling of a large proportion of the unused acid, and removal of ferrous chloride by crystallization to enable the recycling of the unused acid. All three schemes were evaluated at the same concentration of ferrous chloride by-product, which can be directly sold or converted later to ferric chloride, which has a higher market value. Extrapolation of existing solubility data was verified experimentally, cost estimation was done for purchased equipment and utility requirement, and feasibility analyses of the process schemes were completed. Depending on the market demand for the by-product and the criteria chosen, metallic iron addition or evaporation found to be recommendable, while the relatively more expensive crystallization process was also found to bring improvement over the no-treatment alternative. 相似文献
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An economic analysis was carried out for three different recycle/recovery options for waste pickling liquors from hydrochloric acid pickling baths in an existing small-mid scale plant presently neutralizing and discarding waste pickling liquors. The analysis was based on process synthesis and design, which were completed by using real plant data along with some experimental work. Three basic schemes were studied: the addition of metallic iron to convert unused hydrochloric acid to ferrous chloride recovery by evaporation and recycling of a large proportion of the unused acid, and removal of ferrous chloride by crystallization to enable the recycling of the unused acid. All three schemes were evaluated at the same concentration of ferrous chloride by-product, which can be directly sold or converted later to ferric chloride, which has a higher market value. Extrapolation of existing solubility data was verified experimentally, cost estimation was done for purchased equipment and utility requirement, and feasibility analyses of the process schemes were completed. Depending on the market demand for the by-product and the criteria chosen, metallic iron addition or evaporation found to be recommendable, while the relatively more expensive crystallization process was also found to bring improvement over the no-treatment alternative. 相似文献
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针对水泥行业使用固废、危废导致其二氧化硫排放浓度超标的问题,通过脱硫试验筛选具有催化作用的三氧化二铁、氧化镁制备成新型高效催化脱硫剂,其脱硫效率高于工业级氢氧化钙。在河南DD水泥有限公司进行了新型高效催化脱硫剂的工业应用试验。结果表明:与工业级氢氧化钙相比,新型高效催化脱硫剂具有更高的脱硫效率,钙硫物质的量比降低了56.7%。通过新型高效催化脱硫剂的使用,可满足水泥企业二氧化硫质量浓度<35 mg/Nm3的超低排放要求,且此过程无废弃物产生。制备的新型高效催化脱硫剂具有广阔的应用前景。 相似文献
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利用硫磺、碳等还原硫酸法钛白粉生产副产物钛白石膏是处理钛白石膏堆放问题的方法之一。针对硫磺在回转窑分解钛白石膏制硫酸和氧化钙的过程存在时间长、硫磺用量大、硫化钙产量不高等问题,提出了以钛白石膏为原料利用酸浸法去除铁杂质后,利用硫磺为还原剂将石膏在气固竖式反应器中煅烧生成硫化钙和二氧化硫,前者再与硫酸钙煅烧制得氧化钙和二氧化硫,得到的氧化钙可以中和废酸和废水,产生的二氧化硫用来制硫酸的方法。先利用反应热力学计算软件HSC分析确定实验方案,分别在流态化实验(800 ℃,保温40 min)和煅烧实验(1 100℃,保温1.5 h)后得到硫化钙转化率与氧化钙纯度均达到90%左右。再利用Aspen软件模拟了工艺流程,模拟出二氧化硫体积分数可达12.09%,满足制硫酸的需求。硫酸生产成本估算为263.9元/t,具有较大的市场前景。 相似文献