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Background. The development of industry around the world has made the problem of comprehensive processing of industrial waste and the involvement of substandard mineral resources into production urgent. Accumulated industrial waste is considered a complex and labor-intensive work in terms of chemical and particle size distribution. Therefore, the processing of industrial waste from phosphorus production to obtain marketable products is an urgent task. Purpose. Study of the physico-chemical properties of cottrel dust for the production of phosphoruscontaining fertilizers. Methodology. Study of the physico-chemical properties of cottrel dust using modern instrumental equipment. Originality. The scientific novelty of the article lies in the study of the physico-chemical properties of cottrel dust obtained from phosphorus production waste for the phosphorus-containing fertilizers. Findings. It has been determined that the dispersed composition in cottrel dust consists of 90% dust particles with a size of at least 20 microns, and 10% mechanical entrainment. It was revealed that at a temperature of 989.21 0C the mass loss of cottrel dust is 4.12% of the total mass. [ABSTRACT FROM AUTHOR]

Background. Accumulated industrial waste, including from phosphorus production in Kazakhstan, in the form of slag, ferro-phosphorus, phosphorus sludge and cottrel dust, creates serious environmental problems in the regions. Their recycling is important. Purpose. Study of the thermodynamic laws of the process of formation of kottrel dust. Methodology. Thermodynamic calculations of the reactions of kottrel dust formation were studied using the Chemistry HSC-6 programs. Originality. The thermodynamic regularities of the processes of formation of kotrel dust from the electric smelting of phosphorite raw materials have been studied. Findings. The chemical reactions responsible for the formation of kottrel dust, the values of their entropy, enthalpy and Gibbs energy are determined. [ABSTRACT FROM AUTHOR]

Background. A method of obtaining microfertilizer, in which the fertilizer is obtained by the joint processing of humates of allkali metals and salts of trace elements in the solid phase, followed by mechanochemical activation of the mixture in the presence of an oxidizing agent (potassium permanganate) and an alkaline agent. However, this method is considered economically impractical from the point of view of the complexity of the technological design and, as a consequence, the need to purchase expensive equipment [1]. The objective of this work is to develop a method for producing a chelated polymer-containing microfertilizers, which reduces the cost of the process, improves the quality of the finished product and partially solves the issue of recycling technogenic waste. Purpose. Studying the process of obtaining chelated polymer-containing microfertilizers based on technogenic waste. Methodology. The chemical composition of raw materials and the yield of humic acid determined using SEM and IR spectrum. Originality. A method has been developed for the preparation of chelated polymer-containing microfertilizers based on phosphorus sludge - waste phosphorus production and bird droppings, and humic acid is used as a solvent using SAS «OGSPlast» surfactant as a chelating agent with trace elements. Finlings. It was established that mainly in the presence of chelated polymer-containing microfertilizers is formed in the form of an amorphous structure with a partial appearance of crystallization structures, it is also determined that microfertilizers obtained are characterized by a high content of humic substances that are involved in the structure of the soil, the accumulation of nutrients and trace elements in plants accessible to plants form, contribute to the regulation of geochemical metal flows in water and soil ecosystems. [ABSTRACT FROM AUTHOR]