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Utilisation of industrial waste for ferrite pigments production

机译：利用工业废料生产铁氧体颜料

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Preliminary results of research focused on the utilisation of specific waste from metallurgical and mining activities to obtain ferrite pigments are presented. As a source of iron in the spinel-type ferrites with the general structure MFe_2O_4 (where M is a bivalent metal such as Ca and Zn), three types of industrial wastes were used: metallurgical slag from the production of non-ferrous metals and two types of AMD (acid mine drainage) sludge: one of natural origin (Fe-sediment) and the second one synthetically prepared from AMD (Fe-precipitate). This waste was homogenised by ZnO and CaCO_3 in various stoichiometric ratios n(Ca) : n(Zn) : n(Fe) and calcined at the temperature of 1000-1095℃. Mineralogical (XRD) analysis of the metallurgical slag pigments confirmed the formation of zinc ferrite and hematite only (Ca from reaction components entered into other phases). The ferric component of the AMD sludge (Fe-precipitate and Fe-sediment) formed a mixture of zinc ferrite, calcium ferrite, and hematite while increased calcination temperature supported the ferritic structure formation. Prepared pigments have no considerable colour differences; they were in brown colour tones. Pigments from the AMD sludge were more dark brown coloured than those from slag. Pigments were applied in an alkyd-resin paint and consequently basic anticorrosive tests were performed. Pigments obtained from metallurgical slag showed better anticorrosive properties than those from AMD. However, because of high Pb content in pigments from the slag (0.67-1.10 mass % Pb in pigments), utilisation of these pigments in coatings is problematic. Ferrite pigments from the AMD sludge, mainly that with zinc ferrite, have promising application in anticorrosive paints but optimisation of the preparation process is required.
机译：初步研究结果集中于利用冶金和采矿活动产生的特定废物获得铁素体颜料。作为一般结构为MFe_2O_4（其中M是诸如Ca和Zn等二价金属）的尖晶石型铁氧体中的铁源，使用了三种类型的工业废物：来自有色金属生产的冶金炉渣和两种AMD（酸性矿山排水）污泥的类型：一种是自然来源（铁沉积物），另一种是用AMD合成制备的（铁沉淀物）。用ZnO和CaCO_3以各种化学计量比n（Ca）：n（Zn）：n（Fe）均化该废物，并在1000-1095℃的温度下煅烧。冶金渣颜料的矿物学（XRD）分析证实仅形成铁素体锌和赤铁矿（来自反应组分的Ca进入其他相）。 AMD污泥的铁成分（铁沉淀物和铁沉淀物）形成了铁酸锌，铁酸钙和赤铁矿的混合物，而增加的煅烧温度则支持了铁素体结构的形成。制备的颜料没有明显的色差;他们是棕色的色调。来自AMD污泥的颜料比来自矿渣的颜料更深棕色。将颜料涂在醇酸树脂涂料中，因此进行了基本的防腐测试。从冶金炉渣获得的颜料比从AMD获得的颜料具有更好的防腐性能。但是，由于来自炉渣的颜料中的Pb含量高（颜料中的Pb为0.67-1.10质量％），因此在涂料中使用这些颜料是有问题的。 AMD污泥中的铁氧体颜料（主要是含铁氧体锌的颜料）在防腐涂料中具有广阔的应用前景，但需要优化制备工艺。

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