The utility of employing biogenerated ferric iron as an oxidant for the recycling of scrap metal has been demonstrated using continuously growing cells of the extremophilic organism Acidithiobacillus ferrooxidans. A ferric iron rich (70 mol%) lixiviant resulting from bioreactor based growth of A. ferrooxidans readily solubilized target scrap metal with the resultant generation of a leachate con...

INTRODUCTION Metal scrap is a widely used material in steel production, with international trade amounting to about 40 million tons a year. As Italy has no iron production worth mentioning from mines, the country is the first importer of metal scrap in the European Union. The Italian Association of traders of iron and steel, non-iron metals, iron scrap, iron-mongery and similar products (ASSOFE...

Tungsten is recognized as a critical metal due to its unique properties, economic importance, and limited sources of supply. It has wide applications where hardness, high density, wear, high-temperature resistance are required, such in mining, construction, energy generation, electronics, aerospace, defense sectors. The two primary tungsten minerals, the only minerals wolframite scheelite. Seco...

The following issues are considered: the role of hot heel in scrap melting by electric arcs in the furnace freeboard; advantages and disadvantages of furnaces with a single charging and those with a telescoping shell; Specifics of furnace scrap hampering its heating by burners. The possibilities of using different types of burners for scrap heating are analyzed including stationary burners and ...

DEFINITIONS NOTE: These definitions are for your general use and may differ from those applied by various recyclers. Verify the meaning of terms with the respective recycler. APPLIANCES/WHITE GOODS: Refrigerators, washers and dryers, and other household machinery with mostly metal content. Scrap metal dealers are not interested in appliances primarily composed of plastic. BALE: A densified and ...

In this thesis, we address the tactical planning decision problem of ingot sizing in an aluminum sheet manufacturing facility. Ingots used for sheet manufacturing are made-to-stock, and used when necessary, to satisfy customer demands. The facility produces large ingots to exploit economies of scale in ingot casting, but customers order products frequently, and in small quantities. In this situ...

The manufacturing of advanced explosives containing large amounts of metal powders to improve performance, such as PAX-3, have proven difficult to transition into production. Current manufacturing processes have had low yield which results in a high cost per unit and questionable product uniformity. Over the past year the Twin Screw Extruder (TSE) Team has been investigating the use of a TSE ma...

Present study is carried out for the removal of As(lII) from water using commonly available adsorbents such as sand, from Yamuna river (Delhi ), as well as from Ganga river (Kolkata), activated carbon, Hametite ore and sand -iron scrap mixture. All these adsorbents are used as received but sand and activated carbon which do not show much adsorption for As(lII) are modified by treating with diff...