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slag skimmed from metal in smelting process

The initial melting of the material to be smelted is usually referred to as the smelting or matte smelting stage. The denser molten matte layer captures the copper-iron sulphides below the unwanted upper slag layer, which is skimmed off periodically via skim bays and launders into large pots destined for rail transportation to the slag ...

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Copper extraction - Wikipedia

Thus, the two factors that most affect the loss of copper to slag in the smelting stage are: matte grade; mass of slag. This means that there is a practical limit on how high the matte grade can be if the loss of copper to slag is to be minimized. Therefore, further stages of .

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Risk Factors of Vapor Explosion of Molten Slag in Slag ...

emissivity of 0.8. Slag is skimmed at least 60 times during the 8 hours of the skimming process and the resulting skimmed slag was found to be about 1800 tons. After going through the Figure 5: Vapor explosion experiment simulation device. Figure 6: Research method for analysis of slag .

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(PDF) Modeling and control of copper loss in smelting slag

the slag. In the second stage, the . copper content drops slowly from . 1% to 0.5%, and it takes 15 to 20 . ... a faster slag skim rate, as shown in Fig-ures 7 and 8. The Autoskim function .

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Pyrometallurgical recovery of copper from slag material ...

Jun 28, 1977 · What we claim is: 1. A cyclic, two-stage process for recovering essentially all copper values present in molten slag, comprising: (a) subjecting a charge of the molten slag to vigorous agitation in a rotary reactor rotating at a speed of at least about 10 rpm; (b) adding a carbonaceous or hydrogenous reductant to said charge of molten slag in the rotating reactor to reduce magnetite and to ...

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What is Slag? (with pictures) - wiseGEEK

May 24, 2020 · When the metal is smelted to satisfaction, the slag is skimmed from the top and disposed of in a slag heap to age. Aging material is an important part of the process, as it needs to be exposed to the weather and allowed to break down slightly before it can be used. ... in some stage slag is not fluid, why?, after adding sufficient amount of ...

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Characterization of Metal Droplets in Slag ... - J-STAGE Home

skimmed slag after desulfurization of hot metal by injection of CaC2 + 2 wt% cryolite (Campaign 1) and CaC2 + 5 wt% nepheline syenite (Campaign 2). The magnetic fractions in the skimmed slags after desulfurizations (Sources 1 and 2) in Campaign 1 (average reduction of S content in the iron was from 0.026% to 0.0051%) and Campaign 2 (average

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Carbon Steel and Mild Steel | Metal Casting Resources

Impurities are absorbed by lime into a slag on the surface, which can be skimmed from the liquid steel. The product at this stage contains about 4% carbon and still has some impurities present. Molten steel is transferred to the basic oxygen furnace (BOF), which already contains recycled scrap metal.

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Induction Furnace and Important Operational Aspects ...

Once the melting is complete, the slag is skimmed off. Slag generated during melting has tendency to stick on the furnace wall. This reduces volume of furnace hence reduces metal output per heat. Superheating of metal is done at higher temperature and held for few minutes.

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Borates in metallurgical applications

impurities. If the metal is to be refined at this stage any special additives or alloying fluxes should be introduced under the borate cover. The borate slag can usually be skimmed from the metal easily before pouring. If the slag is too thin, it may be thickened by addition of a small quantity of sand.

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Carbon Steel and Mild Steel | Metal Casting Resources

Impurities are absorbed by lime into a slag on the surface, which can be skimmed from the liquid steel. The product at this stage contains about 4% carbon and still has some impurities present. Molten steel is transferred to the basic oxygen furnace (BOF), which already contains recycled scrap metal.

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Mooie social work stages in het buitenland • Go Stage

Werkzaamheden Social Work stage. Als stagiaire Social Work of vergelijkbare studie kun je meedraaien met een lokale social worker. Afhankelijk van jouw achtergrond en profiel werk je met een specifieke doelgroep. Je gaat aan de slag op lokale basisscholen, een special needs project, begeleiden van straatkinderen of community projecten.

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Borates in lead recycling

metal is to be refined at this stage any special additives or alloying fluxes should be introduced under the borate cover. The borate slag can usually be skimmed from the metal easily before pouring. If the slag is too thin, it may be thickened by addition of a small quantity of sand. 1.3 General advantages of the borates as cover fluxes are:

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Copper Mineral - an overview | ScienceDirect Topics

In the first stage, the iron is oxidized and silica flux is added to help the formation of iron–silica slag (also known as converter slag), until the iron content of the matte is very low and slag is skimmed off. In the second stage, the sulphur is removed through continuous oxidation to silica dioxide, leaving behind blister copper, which ...

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Characterization of Metal Droplets in Slag ... - J-STAGE Home

skimmed slag after desulfurization of hot metal by injection of CaC2 + 2 wt% cryolite (Campaign 1) and CaC2 + 5 wt% nepheline syenite (Campaign 2). The magnetic fractions in the skimmed slags after desulfurizations (Sources 1 and 2) in Campaign 1 (average reduction of S content in the iron was from 0.026% to 0.0051%) and Campaign 2 (average

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US4032327A - Pyrometallurgical recovery of copper from ...

A cyclic, two-stage process is disclosed for pyrometallurgical recovery of copper as a high-grade matte from molten slag material containing both dissolved and/or entrained copper values. A charge of the copper-bearing slag material is treated in the first stage of the process with a hydrocarbonaceous or hydrogenous reductant in a rotary furnace, such as a top-blown rotary .

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Quality Castings Inspection: Life of a Casting | Reliance ...
Werken bij Pactum - Pactum

We zoeken regelmatig gemotiveerde collega's die bij ons aan de slag willen. Professionals die met passie hun vak uitoefenen en die echt iets willen betekenen voor ouders en jeugdigen. Ook wanneer je een stage- of onderzoeksplek zoekt ben je van harte welkom.

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Location | Bethlehem Steel Plant | Vacant New Jersey

Slag. The platform directly above the slag cars supports the main blast furnace structure. Certain areas of the raised platform contain openings, allowing impurities and by-products which float to the top of steel during its molten stage, known as slag, to be skimmed off and dumped into the ladle of the slag .

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MANAGING SLAG COMPOSITION TO PROTECT .

slag by resistance heating, and furnace product mattes had approximately the same com-position. However, due to differences in ore mineralogy, and consequently in furnace slag composition, the Guatemalan furnace was operated at a higher temperature. Slag skim-ming temperatures in Guatemala and Indonesia were respectively 1570ºC and 1520ºC.

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