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The article discusses the types of various dusty iron‑containing waste generated in metallurgical and foundry production. Rational waste processing technologies are considered. The analysis of the chemical composition of iron‑containing waste, morphology and particle size is presented. Variants of processing and use technology that are acceptable for the conditions of the Republic of Belarus are proposed.

The foundry inoculant containing alkali-earth metals for smelting steel brand 45 L was tested in production conditions. Relationship of mechanical properties and castability on the number of the entered inoculant was established. It was defined the number of the inoculant allowing to improve properties.

We have defined the regularities of the doping of cast iron through the slag phase of nickel and copper due to the waste catalysts using a carbonaceous reducing agent. We have justified the need to use the cast iron chips as a seed in the composition of the slag mixture. We have defined the dependence of the degree of extraction of nickel or copper from spent catalyst on the amount of the catalyst, on the basicity of the slag mixture, on the temperature and time of melting.

Analysis of existence of initial raw materials for production of the superdispersed powders Al(OH)3 and Al2O3 in the Republic of Belarus is given, and also parameters of technological process of their production by sol-gel method are determined. Data on degree of efficiency of additions of powders to the traditional modifiers eliminating chill in castings of gray cast iron is provided.

The technology of separate extraction of bismuth and molybdenum from spent catalyst was presented and information on the effectiveness of its use in a composition of comprehensive modifier in the iron-carbon alloy was given.

Efficiency of hydrometallurgical leaching of molybdenum with alkali, soda and ammonia in course of processing of spent catalysts was considered.

The possibility of fortification of the cast iron smelted in cupola due to alloying it with copper of copper-bearing wastes is studied.

The mechanism of cast iron alloying through slag phase due to use of nickel and copper oxides is considered and the analysis of kinetics regularity of alloying in case of absence of fuse in the form of milled cast-iron chips in slag and at their presence in it is carried out.

The influence of surface-active component of complex modifier on structure of low-carbon steel is shown. It is determined that the complex modifier, containing carbideforming and surface-active components, influences more effectively on macro- and microstructure of low-carbon steel.

It is shown that introduction carbon into modifier composition and increase of its dispersion degree due to spatter on high-melting particles or due to mechanical alloying increases modifier efficiency for grey cast iron.

It is shown that the used bismuth-molybdenum catalyst can serve as an effective additive in composition of the complex malleable cast iron modifier, which allows to reduce the cost of modifier and castings.

It is studied alloying kinetics o f cast-iron through a slag phase. The reducer and cast-iron chip additives into slag composition were demonstrated to accelerate a process of nickel transition from slag to metal.

Alloying process of cupola iron by means of input into charge structure of briquettes of the worked-out coppermagnesium catalysts is investigated. This technology allows to carry out recycling of expensive metals, such as copper, and to raise strength properties of cast iron melted in a cupola.

The carried out series of experiments confirmed the technical reasonability of enrichment of exhaust nickel catalysts with the purpose of their further usage as nickel concentrates for alloying of casting alloys.

The received results testify that introduction into composition complex of modifiier of carbide-forming and surfactant elements promotes increasing of its efficiency on macroand microstructure of steel.

The technology of processing of copper-bearing dead catalysts, which includes leaching and deposition of copper by means of electrolysis and also their application in composition of the mixture for alloy doping is offered.

The role of closed air gates at casting by gasified models of non-casting polystyrene in the process of castings defects elimination, connected with creation of non-gasified products of polystyrene thermodestruction, is studied.

The technological process of the cast-iron IChH28H2 alloying by means of insertion into burden composition of briquettes of dead nickel-chromic catalysts is developed. This technology allows to carry out recycling of expensive metals such as nickel, and in that way to decrease the cost price of castings.

The influence of technological factors on degree of recovery of Ni out of dead catalysts containing about 20% of NiO is studied. It is determined that they can be used without enrichment for low alloying of iron-carbon alloys at casting in usual casting houses.

The article touches upon the solving of the actual problem — production in conditions of Belarus of ferrochrome of the leather production wastes, that allows to solve several technological problems and to reduse import of expensive ferroallows.

There is developed the technology of drying and pyrolysis of the chrome-containing discards of tanning production, allowing to change ecology-dangerous organic component into pyrocarbon and to increase the concentration of Cr203 from 10 to 90%. There is proved the possibility of the carbo-thermic method of production of the iron-chromium allow from the prepared discards. There is carried out melting in induction-furnase 1ST 04, received 500 kg of allow containing 11% Cr and 3,4% C.

The opportunity of use ultrafine and nanosized particles obtained from production waste, for the manufacture of cast iron modifiers was shown.

It is established that for the purpose of increase of modifying efficiency of the melt from gray cast iron it is possible to use mechanically alloyed aluminum powder with superdispersed particles of aluminum and graphite oxide.

The influence of parameters of the technological process on proportion of Al and Ni in nickel concentrate, received on the basis of used catalyst with low content of nickel is studied.