A. Formoso

Treatment and recovery of pickling liquors

Abstract The aim of this paper is to present the scientific and technological techniques available for the treatment and/or recycling of waste liquors from steel pickling processes in the steelmaking industry. Due to their high iron and acid contents, pickling liquors are a source of environmental pollution. The production of this type of waste is estimated at 100 1/t steel. Because of their pollutant content and corrosiveness these liquids appear in the list of hazardous wastes in all legislations. In US legislation (US Resource Conservation and Recovery Act. Public Law 94–580) they appear with number K062. When seeking to resolve the environmental problems associated with this type of waste two main options are available: that of applying treatments which aim to neutralize the waste or that of recycling the different components which make up the liquors. In this second case the aim should be to recover the acid which can be recycled in the pickling baths and to recover the iron, obtaining products with ...

Caracterización de carbones para la inyección por toberas en el horno alto

The efficiency of blast furnace operation with pulverized coal injection (PCI) by tuyeres is determined by the composition and properties of the used coals and by the quality of the ferrous burden and coke. A study in thermobalance of coals to be injected by tuyeres is carried out, and the softening and melting temperatures of coals ash are determined. The coal performance and its influence in the blast furnace operation is estimated.