Recycling of iron-containing deposits – the main way to increase the efficiency of water-protective measures on the territory of the Tom lower course

Introduction. The sludge of the washing waters of the underground water iron removal station is a large-tonnage technogenic waste that is dangerous for the environment. The homogeneous chemical composition and finely dispersed structure of the sludge make it possible to consider it as a valuable raw material for the production of various products in the conditions of a forward movement towards a circular economy. Obtaining nanosized metal powders from the sludge of iron removal stations has a number of advantages over traditional physical, chemical and mechanical methods. To optimize the process of obtaining highly dispersed metal powders from the sludge of iron removal stations, it is necessary to study the influence of the main technological parameters on the size, shape and chemical composition of the final material. Materials and methods. Thermal treatment of the sludge of the iron removal station in the carbon monoxide medium was carried out in the temperature range of 400–600 °C. Ultrasonic dispersion was used to get an idea of the true particle size. The granulometric composition of the sludge was studied by electron microscopy and laser beam scattering. Results. The results of experimental studies of the granulometric composition of the treated sludge of iron removal stations are presented. The particles obtained at a temperature of 450 °C had the most pronounced spherical shape, low open porosity, and a low degree of adhesion to neighboring particles. These properties are key for micro- and nanopowder-based products. An increase in the temperature of sludge processing led to the adhesion of particles and their fusion into large aggregates with a brittle structure as a result of the development of crystallization processes. Conclusions. The proposed methods of physicochemical treatment in an environment of carbon monoxide and ultrasonic action of the sludge of an iron removal station, which is currently a technogenic waste, makes it possible to obtain a highly dispersed metal powder. This material has the necessary properties for use in modern high-tech industries.

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Technology Improvement of High-Dispersive Metallic Iron Powders Based on Sediments of Iron Removal Station

Maksimov¹,

Mirinov²

2020

Vestnik Tomskogo gosudarstvennogo arhitekturno-stroitelnogo uni

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Sediments from iron removal stations are a source of environmental pollution. It is necessary to find effective and eco-friendly methods of sediment disposal. The paper investigates the properties of iron-containing sediment in order to develop a technology for its further utilization. It is shown that sediments from the iron removal station of Velizhansky water intake have a stable chemical composition with about 70 % Fe2O3, and a stable particle size distribution, i.e. 20 μm for ≈ 87 % of particles. These parameters allow developing a flow chart for iron reduction in heated carbon monoxide. The involvement of sediments from iron removal stations in the high-dispersive metallic iron powder production eliminates the sediment deposit at landfills or storage tanks and creates a new raw material base for additive technologies.

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Recycling of iron-containing deposits – the main way to increase the efficiency of water-protective measures on the territory of the Tom lower course

Cited by 3 publications

References 4 publications

Groundwater Treatment Plants as a Sustainable Source of Iron-Containing Nanopowders

Groundwater Treatment Plants as a Sustainable Source of Iron-Containing Nanopowders

Iron removal stations’ sludges postprocessing for its resource potential identification

Technology Improvement of High-Dispersive Metallic Iron Powders Based on Sediments of Iron Removal Station

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