The aim of this project is to demonstrate the recovery of zinc, lead and other valuable metals from zinc-lead blast furnace slags using less energy than that needed to extract them from their conventional raw materials. This will be achieved by fitting a plasma torch to an extended section of the blast furnace forehearth. A carbonaceous reducing agent will be added to the electrically heated slag to reduce the zinc and lead oxides to produce metals which will evaporate to form vapours that will then be condensed to liquid metal. The project involves modifying a zinc-lead blast furnace by building a transferred arc plasma torch into the totally enclosed blast furnace fore hearth. An electric arc is struck between the plama torch electrode and the slag stream. The majority of the arc energy is liberated at the arc-slag terminus producing a temperature of around deg c. A carbonaceous reducant such as coke breeze is added to the slag to reduce the zinc oxide to metallic zinc vapour. This vapour is condensed from the exhaust gases in a zinc splash condenser.

Material Details

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site with definite Roman tap slag) and for iron spatial distribution across the site​. Not all the smelting; all furnaces known to date from this period are of a.

Historical Version s – view previous versions of standard. More C This specification covers three strength grades of finely ground granulated blast-furnace slag Grades 80, , and for use as a cementitious material in concrete and mortars. The slag shall contain no additions and shall conform to the sulfide sulfur and sulfate chemical composition requirement. Physical properties of the slag shall be in accordance with the requirements for fineness as determined by air permeability and air content, slag activity index, and compressive strength.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. The material may also be useful in a variety of special grouts and mortars, and when used with an appropriate activator, as the principal cementitious material in some applications.

Assessment of the use of spent copper slag for land reclamation

Geopolymers mixes were fabricated from Metakaolin MK and Blast Furnace Slag BFS waste material in the presence of sodium hydroxide and sodium silicate which were used as alkali activators. To optimize the suitable amount of slag, eleven batches were designed, mixed and homogenized for 30 min. To determine the suitable amount of liquid required for pasting, normal consistency and setting time were determined.

Date: Feb. From: Waste Management and Research(Vol. 24, Issue 1) The physical and geotechnical properties of the spent copper slag were first.

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Archaeomagnetic dating of copper smelting Site F2 in the Timna Valley (Israel) and its implications for the modelling of the ancient technological developments.

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Occurrence of Apatite in Slag

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Date. Management. Rate (kg ha−1). 5 June Soybean Planting site, a subsample of EAF slag was taken for physical and chemical.

This task is dedicated to pre-concentration of the material streams by physical and physico-chemical separation technologies mineral processing. Several separation techniques will be tested on the representative investigated sample of slag. The proposed innovative techniques will significantly increase the selectivity and recovery rate. Main objectives of this task are:. Magnetic separation will be tested on the crushed slag in dry and wet technologies, using low and high intensity magnetic separators at BRGM in order to recover metals droplets and metal-oxides containing minerals.

Furthermore, an innovative dry multipolar magnetic separator, which is to date the most efficient magnetic separator, will be tested. This equipment was designed to create a strong agitation of particles that allows the release of non-magnetic particles, which are entrapped with the magnetic fraction, leading to the production of a magnetic fraction of a good quality.

The Open Materials Science Journal

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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. I SHOULD like to be permitted to ask whether any mineralogical readers of NATURE have themselves come across, or have anywhere seen mentioned, the occurrence of crystallized apatite in a metallurgical slag or other artificially-formed silicate?

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