Entity

Time filter

Source Type

Novate Milanese, Italy

Maccagni M.,Engitec Technologies | Pyatt J.,Doc Run Company
World of Metallurgy - ERZMETALL | Year: 2014

Lead production is based on pyrometallurgical processes. While many improvements have been made to the processes, environmental regulations continue to become more and more stringent, particularly in western countries. One possible solution to these environmental and health concerns is a hydrometallurgical process to convert lead concentrate into metal. The last twenty years of the past century were characterized by the extensive efforts of researchers from all over the world to find a viable hydro- metallurgical process to replace the pyrometallurgical ones in order to reduce, or eliminate problems related to air emissions, slag production, internal recycling of dusty materials and also provide overall improvement of workplace conditions. For a variety of reasons, none of the hydrome tallurgical developments were able to reach the industrial scale (the Betts electrorefining is the only process trying to replace a pyro unit with a hydro one). Engitec studied the FLUBOR® Technology and, together with the Doe Run Resources Corporation, developed a pilot plant and a demo plant. These two plants are now used to test material for testing lead concentrates. In this paper, we are going to summarize the Engitec/Doe Run approach for primary lead hydrometallurgy as well as the results of a recent test in which two different concentrates with different lead concentrations were studied. Source


Maccagni M.,Engitec Technologies
World of Metallurgy - ERZMETALL | Year: 2013

In the last years the desulphurization with sodium salts suffered from bad economics and from difficulties in marketing its product, the sodium sulphate. In any case desulphurization induces quite high improvements and savings in the foundry making this operation suitable. The ammonium salts based desulphurization seems the right way for overcoming this impasse. It offers much better economics and a very promising perspective for the marketing of the product, the ammonium sulphate, which can be used as a fertilizer. The CX technology changed very much in the last years. Some changes in the desulphurization unit were introduced. In this paper we will go through the differences induced by the different desulphurization designs and we will mention at the end the new CX project, under execution, where this new desulphurization approach is going to be implemented. Source


Maccagni M.,Engitec Technologies
World of Metallurgy - ERZMETALL | Year: 2012

The reduction of emissions and wastes are the most important issues in secondary lead production. SO 2 emission control is the key issue, not only for air emissions, but also for slag production. Battery paste smelting is the most problematic operation in lead acid battery recycling. For this reason, there have been considerable efforts in the last three decades to find a hydrometallurgical approach to produce lead from paste. In order to improve their process, Engitec Technologies has built and operated a demo unit in their lab for a new desulphurization approach, the super-desulphurization, to validate the data obtained in bench and pilot tests. The same demo plant was used to demonstrate the desulphurization of paste using ammonium salts that is supposed to be very attractive because of the price and market situation for the sodium salts used and produced till now. The primary scope of these tests was a further reduction of sulphur left in the desulphurized paste as well as the minimization of the presence of lead-alkali salts which contribute to the production of slag during the smelting. Tests in industrial furnaces demonstrated that big advantages can be achieved. The demo plant equipment can be used for additional future developments requiring some process scale-up after successful bench and pilot stage tests. Currently, taking advantage from the very good results achieved in desulphurization and from the highly quality of the desulphurized paste, it is used as to produce desulphurized paste suitable for feeding the F.L.A.S.H. Process, a new electrochemical approach for the production of lead from desulphurized paste. Source


Maccagni M.,Engitec Technologies
World of Metallurgy - ERZMETALL | Year: 2010

The reduction of emissions and wastes are the most important issues in secondary lead production. SO2 emission control is the key issue, not only for air emissions, but also for slag production. In order to improve their process, Engitec Technologies has built and operated a demo unit in their lab for a new desulphurization approach, the superdesulphurization, to validate the data obtained in bench and pilot tests. The scope of this unit is a further reduction of sulphur left in the desulphurized paste as well as the reduction of the presence of lead-alkali salts which contribute to the production of slag. The super-desulphurized paste was tested in an industrial furnace to evaluate the impact this paste will have on smelting. The demo plant equipment will be used for additional future developments that require scaling-up from successful bench and pilot stages. Currently, these include the desulphurization with ammonia salts, and the Flash Process, a new electrochemical approach for the production of lead from super-desulphurized paste. This paper is mainly focused on the results of the new super-desulphurization, but will also provide an update about some new possible developments in the secondary lead production. Source

Discover hidden collaborations