OPERATING AND CORROSION FEATURES
OF PERICLASE-CHROMITE REFRACTORIES DURING
ELECTROTHERMAL TREATMENT OF LEAD-CONTAINING PRODUCTS
A. A. Biryukova,
T. A. Tikhonova,
and A. V. Boronina
Translated from Novye Ogneupory,No.6,pp.3–8,June 2015.
Original article submitted March 11, 2015.
Features of an electrothermal unit periclase-chromite lining operation during treatment of lead- and zinc-con
taining products are studied. It is established that during operation a refractory lining is subjected to erosive
and corrosive wear. The nature and degree of refractory breakdown depends on its location within elements of
an electrothermal unit. Greatest wear occurs for a refractory lining in a smelting furnace roof and slag belt.
Keywords: lining, refractory, silver foam, electric furnace, condenser, arch, slag belt, phase, periclase,
chrome spinelid, silicates, zinc, lead.
The main methods for processing lead raw material in
Kazakhstan nonferrous metallurgy are pyrometallurgical:
shaft reduction melting of agglomerate, reaction melting on
hearths, and reduction reaction melting in an electric fur-
naces. Processing lead raw material concerns reduction-reac-
tion melting in electrothermal units. This method is used to
process lead concentrate, copper dross, metallurgical dust,
and including silver foam [1 – 4].
The aim of this work is to study features of service and
corrosion of periclase-chromite refractories in an electro
thermal unit for processing silver foam in the OA Kaztsink
An electrothermal unit, processing silver foam, consists
of individual elements: melting furnace, zinc vapor con
denser, and a dust catching unit (Fig. 1). The main elements
of the electrothermal system for processing silver foam is a
three-electrode furnace of round construction. The internal
elements of the electric furnaces (roof, walls, and hearth) and
condenser lining are of periclase-chromite refractory compo
sition. Condenser dust and gases enter an inertia dust catcher,
fitted with an explosion-proof valve, and then into bag fil-
ters. The furnace and condenser operate under pressure, con-
The silver foam melting process is carried out in an elec-
tric furnace in a reducing atmosphere at 1000 – 1200°C. The
temperature of the vapor and gas mixture beneath the roof is
1000 – 1250°C, in the short gas conduit it is 950°C, and in
the condenser it is 650 – 700°C.
Processing of silver foam includes zinc distillation with
condensation as liquid metal, and preparation of silver-con
taining lead. At the end of melting silvery lead enters through
a siphon into a mold and is sent for cupellation.
Refractories and Industrial Ceramics Vol. 56, No. 3, September, 2015
1083-4877/15/05603-0230 © 2015 Springer Science+Business Media New York
AO TsNZMO, Almaty, Kazakhstan Republic.
Fig. 1. Electrothermal unit processing silver foam: 1 ) melting fur
nace; 2 ) condenser; 3 ) dust catching unit.