Abstract
Relevance of research is determined by the need to study for subsequent rational processing of technogenic mineral raw materials – pyrite cinders formed during firing pyritic concentrates for the production of sulfuric acid. Topical issues here are the determination of their chemical and mineral composition, morphology of particles, which predetermine possible technologies of their processing. Purpose of research – study of the material composition of pyrite cinders of the dumps of the Kirovgrad coppersmelting plant, features identification of the composition of different-age dumps. Methods of research. In the selected samples of pyrite cinders, their chemical composition was determined, the morphology of particles was studied by photographing them using the Philips XL-30 electron microscope equipped with an energy dispersive spectrometer (EDS), and possible processing technologies were analyzed. Results. It was found that pyrite cinder of the old dump (no. 1) is characterized by low SO3 contents and low values of losses when firing relative to dump no. 2, which is determined by the oxidation of residual pyrite, as well as CaO and higher Fe2 O3 contents. The study of the morphology of pyrite cinders microparticles showed that they have an irregular shape, globule shape and spherical size from 40 μm to 2 mm. Some known technologies of purple ore processing are considered. Conclusion. The morphology of pyrite cinders particles and their chemical composition were determined as a result of the research. Taking into account the research results and morphostructural characteristics of cinders material, in particular, it is obvious that a number of technologies can be chosen for their complex processing; at the same time this determines further directions of their research, for example, the study of valuable impurity elements in them and their behavior in the process of changing the material of the dumps.
Highlights
IntroductionGreat attention has been paid to the study and processing of man-made formations, which constitute an additional source of mineral raw materials [1–6]
Great attention has been paid to the study and processing of man-made formations, which constitute an additional source of mineral raw materials [1–6]. The relevance of these studies is determined by obtaining the data necessary for the subsequent rational processing of data to assess the quality of technogenic mineral raw materials
One of the reasons for this is the poor knowledge of their material composition, as well as the morphology of these formations [9, 10]
Summary
Great attention has been paid to the study and processing of man-made formations, which constitute an additional source of mineral raw materials [1–6]. According to [7], currently only four of the largest storage facilities (LLC “Ammophos”, OJSC “Minudobreniya”, Kirovgrad Copper Smelting Plant and Priargunsky Industrial Mining and Chemical Association) contain more than 25 million tons of pyrite cinders. They are valuable technogenic raw materials but traditional methods of concentration such as gravity, flotation, and electromagnetic separation are ineffective for their processing [8]. 18.41 The chemTiOic2al composition of pyrite0.3c0inders (table 1) contFFaeein2OOs3iron oxides, as well as alu50m3..48i0n3a and silica, which iMsgdOetermined primarily by the 1c.o20mposiof dum1p7.n5o00.
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