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Abstract Most ferroalloy plants lose considerable amounts of metal in their slag and metalslag mix. A potential source of income for alloy smelters is the massive reserves of metal contained in their slag dumps. Depending on the smelting process and the age of the slag dump, the metal contents vary between 3 and 15. One important means of reducing costs has been the widespread ...
Recovery of metal values from copper slag and reuse of residual secondary slag Waste Manag. 2017 Dec70272-281. doi 10.1016j.wasman.2017.09.024. ... On the other hand, the non-metallic residue, the secondary slag, can be used in the glass and ceramic industries. Reduction time and temperature and carbon content were shown to be the most ...
Note that, for the purposes of these calculations, all of the Co, Cu, and Ni in the feed slag was assumed to be in the oxidized form, i.e. present as CoO 1.272 or 0.254, Cu 2 O 0.563, and NiO 2.546.. When carbon is added to the slag, the various metallic elements reduce to different extents, at a given level of carbon addition.
What is claimed is 1. A process for the recovery of metal values from copper smelter slag material which comprises mixing with agitation a unit part by weight of slag and about a unit part by weight of concentrated sulfuric acid to form an acid-slag mixture, incorporating in the acid-slag mixture about a unit part by weight of water, and allowing the mixture to react to produce a dry, solid ...
Abstract In this research, an effective approach for recovering metallic Bi from Pb Bi slag using selective leaching followed by Bi electrowinning was demonstrated. First, a thermodynamics calculation was performed to analyze the differences of solubility between PbSO4 and Bi2O3 in chloride system. Then the experiments results indicated that bismuth was selectively dissolved with a high ...
Jan 04, 2021 In this study, hydrometallurgical processes involving pressure acid leaching and solvent extraction were developed to aid recovery of indium from zinc slag, which is produced in the imperial smelting process. Four different acid leaching methods were studied, namely atmospheric leaching, atmospheric leaching with KMnO4, roasting-atmospheric leaching, and oxygen pressure leaching in a
This approach is satisfactory when the metals in the slag are in either the sulphide or metallic form, but is not suitable for the recovery of oxidized metals. Cobalt in particular, and nickel to a lesser extent, are found in an oxidized form, and for these slags, treatment in an electric furnace operated under reducing conditions is necessary.
Energy recovery from slag is difficult as heat . removal results in a phase change from liquid to solid. Formation of solid slag on the surface of cooling slag inhibits heat transfer and solidification of the slag prevents circulation or movement of slag through heat exchangers and heat transfer devices. Formerly slag was poured into slag pits
Jul 18, 2013 Metal Recovery from slag Recovery of metals from melting furnace slag has become an important branch of the recycling. The separation of metal from the waste part slag crushing process for recovering metal from induction
Copper slag was characterized and processed. The pyro-metallurgical processing prospects to generate utilizable materials were arrived at through rigorous thermodynamic analysis. Carbothermal reduction at elevated temperature near 1440 C helped recover a majority of the metal values e.g., Fe, Cu and Mo into the iron-rich alloy product which can be a feed material for steel making.
Dec 01, 2017 Carbothermic reduction of the metal-oxide phases in the presence of fluxes at high temperature has long been known as a useful technique for the recovery. In fact, slag cleaning has been in practice in many plants to recover valuable metals such as Co and Mo. Iron oxide and silicates are almost always important constituents of the copper slags.
Jul 05, 2017 BOF steel slag is a main by-product in steelmaking. The valorization of BOF slag is good for the industry and the environment. In the present study, the carbo-thermic reduction of BOF slag has been investigated, the reduction of Fe and P containing phases i. e. oxide and compounds is discussed, and the effects of Al2O3 additions on the reduction process are described.
With the existing process route in the pyrometallurgy of copper the recovery of valuable metals from the slag phase is not sufficient. The selective separation or enrichment of these metals into a metallic or matte phase would lead to an improved exploitation of the available potential. Beside economic reasons also ecological benefits would be ...
Feb 09, 2018 Some of waste could be potentially reutilized to be a commodity with the higher economic value. Tin slag is one of them. The aim of this research was to recover the tin contained in tin slag. Before coming to the electrolysis, tin slag must be treated by dissolution. The grinded tin slag was dissolved into HCl solution to form a slurry.
The present invention, therefore, provides stage crushing method for recovering precious metals from slag produced by a coal burning furnace or boiler comprising a plurality of crushing steps, wherein each crushing step produces slag particles having successively smaller particle diameter sizes, said crushing steps continued until a final desired particle diameter sized is obtained wherein ...
Apr 05, 2015 Fig. 3. Efficiency of copper recovery depending on slag fragmentation rate in rough flotation Mineral composition and morphology of copper phase in the slag are of importance for the flotation process only sulfide and metallic particles could be fotated and are directly dependent on
can be recovered 8. Thus, the process used to recover metals from slag consisting in reducing the slag at high temperatures with coke as reducing agent can be used to selec-tively reduce the metallic oxides according to their thermodynamic stability, and metallic phase containing mainly iron and copper is obtained. Therefore, the main objective of
Mar 09, 2020 Cooling solutions in metal slag recovery Published by Torraval on 9 March, 2020 9 March, 2020. Refrigeration in the metal slag recovery industry. Adapting a cooling tower design in a light metal treatment industry in Vizcaya, which works principally in valuation of metallic residues.
Waelz slag is an industrial by-product from the recovery of electric arc furnace EAF dust which is mainly sent to landfills. Despite the different chemical and mineralogical compositions of Waelz slag compared to traditional clays, previous experiments have demonstrated its potential use as a clay substitute in ceramic processes.
Corpus ID 138088511. Development of Molten Slag Dry Granulation and Heat Recovery in Steel Industry articleChunxia2008DevelopmentOM, titleDevelopment of Molten Slag Dry Granulation and Heat Recovery in Steel Industry, authorZhang Chun-xia, journalJournal of Iron and Steel Research, year2008
Molten slag discharged from a metallurgical furnace and flowing down from a slag trough is atomized by air jet into a primary heat-exchanger of rotary cylindrical type and hot slag granules thus obtained and air are caused to pass in a co-current therethrough so as to exchange the heat of the slag to the air flow to obtain a primary hot blast, then the hot slag granules discharged from the ...
Mar 20, 2017 Basic oxygen furnace BOF steel slag is a main byproduct in steelmaking, and its valorization is therefore of considerable interest, from a metal-recovery perspective and from a residue-utilization perspective. In the present study, the carbothermic reduction of BOF slag was investigated systematically. The reductions of Fe- and P-containing phases i.e., oxide and compounds are
US9371571B2 US13994,807 US201113994807A US9371571B2 US 9371571 B2 US9371571 B2 US 9371571B2 US 201113994807 A US201113994807 A US 201113994807A US 9371571 B2 US9371571 B2 US 9371571B2 Authority US United States Prior art keywords slag hot liquid cake granulation metallic particles Prior art date 2010-12-15 Legal status The legal status is an assumption and is not
the treated slag and the high recovery yield of steel grains from the residual slag, the pyrolytic self-slaking process is generally used in China. From 2007 to 2010, this process has been adopted by more than 30 steel companies such as Bayuquan works ... recovered metallic phase contains more than 85 iron which can be reused as scrap in BOF ...