Prospects for the Use of Drum-Type Units to Recycle Metallurgical Slags

Abstract

This article examines one of several approaches currently being taken to the recycling of metallurgical slag in the liquid state inside drum-type units. Technological and design features of the units are discussed. The recycling units make it possible to obtain different types of products from slag melts. A new design of an experimental rotor-type unit is also described.The technology used to recycle metallurgical in drum-type units [1-3] entails subjecting the slag to the action of various heat-transfer agents in order to cool it, form the structure of the product, and determine its coarseness. The heat-transfer agents used are moving bodies, water, air, water-air mixtures [4], or other media with different energy characteristics and different mechanisms of acting on molten slag. Metallic working bodies are placed in a movable or stationary container with holes in the form of open or closed grids installed with transverse or lengthwise grates. Motion of the bodies is induced either by rotation of the container or by the use of movable fl anges that move the bodies over the grates. The slag melt is directed onto the metal bodies by different methods: along the axis of rotation of the grates [5], above the axis of rotation [6,7], through the grates [8], or into the openings formed by the moving grids [9].A crane or a special stand with a manipulator is used to feed the slag melt into the interior of the grated container from a ladle. The melt can also be fed into the unit from the furnace through an intermediate container equipped with a batcher or by some other method.The heat-transfer agents can act on the slag melt and the solidifying slag both directly inside the grated container and outside it. For example, they could also act on the slag in a system of transport devices -drum-type, roll-type, or conveyor-type vessels [10].The melt fed into the container cools on the surface of the working bodies and inside the cavities formed during their interaction with the melt. The length of time that the melt interacts with the bodies depends on the dimensions of the unit, the dimensions of the working bodies and the openings between the grates, the speed of the bodies over the grates, and other parameters such as the material and weight of the bodies, their temperature while they are in contact with the melt, and the fullness of the grated container.The rate of cooling of the melt and the temperature and viscosity of the slag at the outlet of the container can vary. The values of these parameters depend on the chemical composition and initial temperature of the melt, the rate at which it is fed onto the working bodies, the parameters of the bodies, and the nature of their interaction with the melt and the coolants. The desired structure. shape, and size is imparted to the melt as the coolants leave the unit.

Slag Technogenic Formations as a Material for the Production of Silicate Products and Pig Iron

“…In our opinion, in the works [10][11][12][13][14][15][16][17] the study directions are secondary production factors, since in these aggregates only one component of slags, iron-containing, is affected. The silicate component of slag is not affected, nor is it converted to a marketable product with surplus value.…”