Composition and erosion of Gunite coatings and the technology of converter guniting

Application of refractory slag-forming coatings to the lining of converters

“…The first is intensification of the processes of combustion of the flame for the purpose of increasing the life of the periclase coatings [I], and the sec ~ ond is conversion to guniting with inexpensive and readily available materials (primarily lime) for partial or complete replacement of periclase powders in guniting mixtures [5,6].The first direction is accomplished in the following manner.By selecting the forms of fuel [I, 7] or by changing the design of the heads of multinozzle guniting guns [4,8] a reduction in coating porosity is obtained.However, with packing the periclase coating starts to spall and therefore additional measures for elimination of thermal failure of gunited coatings become necessary.These include additions to the guniting mixture of slags and oxides of iron [i] or aluminum [2] or guniting with thin layers [3]. The latter measure is not always possible under the conditions of organization of work in converter shops, and additions of oxides lead to a reduction in the slag resistance of the applied layers.…”

Torch guniting of open-hearth roof local burns

“…The multiorifice head of a guniting lance [10], but with a smaller degree of dispersal of the guniting compound, was selected for the torch. The basic parameters of the equipment and the torch-guniting process of open-hearth roofs and, for comparison, of Azov Steel Plant converters are presented in Table 1.…”