Testing of the technology for processing the slag of a precious metal shop in a rotary-type unit

Abstract

This paper presents the results of the testing of the technology for processing liquid slags of a precious metal shop in a rotary-type unit. The main feature of the unit is its ability to process metallurgical slag in a liquid state to obtain a product with a wide range of properties and purposes. The technical characteristics of the pilot plant are given. The peculiarities of cooling high-temperature slag melts on moving metal bodies placed on grates forming a cylindrical surface are presented. Metal bodies (spheres) can move along the grate surface and simultaneously extract the heat of the slag melt. To control the cooling process, the design of the unit provides systems for supplying and distributing water and removing a combined-cycle gas mixture. The grate surface in the form of a rotor is covered with a heatproof and soundproof casing, which is connected to a steam–gas mixture removal system. The melt cooled in the rotor cavity enters the trough conveyor. The conveyor is also covered with a casing and connected to the steam–gas mixture removal system. Examples of different modes of slag melt cooling in a rotary-type unit are presented. A variant of discharging cooled slag directly under the rotor into a special box equipped with a sewage drainage system is tested. Satisfactory results can be achieved in obtaining crushed stone and crushed stone–sand mixtures with the required properties directly from slag melts.