Recovery of silica gel from blast furnace slag . × ... Download Free PDF. Recovery of silica gel from blast furnace slag. Resources, Conservation and Recycling, 2003. Maurizia Seggiani. Sandra Vitolo. Download PDF. Download Full PDF Package. This paper. A short summary of this paper.

Download full-text PDF ... sizes were varied to investigate the leachability of slags for aluminium recovery; up to 43 % aluminium was recovered with 95 % of silicon content remaining in leached ...

Optimization of process for total recovery of aluminum from smelting slag 2. removal of aluminum sulfate ... Download full-text PDF ... Heating destroyed the cyanide to less than 0.2 mg/l free and ...

mina into its component elements as metallic aluminum and oxygen gas. The oxygen reacts with the carbon anodes, forming bubbles of CO and CO 2 gas. Liquid aluminum settles on the bottom of the cell since it is denser (specific gravity 2.3 at 960°C) than the electrolyte (specific gravity 2.1). Periodically, this aluminum is siphoned off by vacuum

A method of recovering metals and producing a secondary slag from base metal smelter slag produced by a copper or nickel smelter includes mixing the smelter slag with at least one reducing agent selected from the group consisting of carbon, calcium carbide, ferrosilicon and aluminum, said carbon and calcium carbide (if present) being from about 1% to about 40% by weight of the slag and said ...

Product on the base of aluminium oxide with Al2O3 content 99.75 % was recovered after drying. Experimental results showed that only 20% of aluminium dross can by dissolved and not all amount of aluminium oxide reacts with NaOH. Leach- ing residue finally consists of spinel (MgAl2O4) and non-leached aluminium oxide.

FREE Download: The Monthly MMI® Report – covering Steel/Iron Ore markets. ... under which Harsco will recover iron from the slag, which can then be reused in steel making. ... Aluminum aluminum ...

Almost all copper slags contain a considerable amount of Cu (0.5–3.7%) close to or even higher than copper ores. Depending on the origins, some slags contain Co and/or Ni at levels worthy of recovery and utilization. Toxic elements (As) and heavy metals (Pb) exist in some copper slags (see slag 3 and slag 6).

Aluminium dross is the mixture of metallic aluminium and non metal part mostly Aluminium oxide. Dross is formed on the surface of molten Aluminum or its alloys by oxidation. Dross is a valuable by product of any Aluminium Smelter or Aluminium Foundry. Dross is recycled to recover the valuable Aluminium Metal world wide.

Saline slags generally contain 3–5% metallic Al, 15–30% Al 2 O 3, 30–55% NaCl, 15–30% KCl and traces of AIN, AlC 3 and Al 2 S 3 . Aluminium slags are generated through melting process in furnaces without fluxes. Aluminium slag composition vary significantly due to the generation of the same in different phases of the aluminium cycle.

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A process for the treatment of an aluminum-salt slag produced in the remelting of aluminum by the addition of salt to aluminum scrap wherein the aluminum salt slag is subjected to pressure and impact rolling to a thickness of about 0.2 mm to about 1 mm and the product is milled to an X 80 value of about 130 to 150 microns. The milled product is classified in a plurality of stages to recover ...

Recover non-ferrous metals and aluminum from ELV shredders. In the case of aluminum scrap from the car shredder, our customers sort the iron-free product stream from the shredder into grain sizes, e.g. 10 - 30 mm, 30 - 70 mm and 70 - 150 mm using a non-ferrous metal separator (STEINERT EddyC®) into the so-called ZORBA fraction.

Aluminum has not been recommended as reducing agent to recover chromium from the slag. There could be two reasons. One is due to its high cost. The other could be its stronger reducing ability than that of silicon. SiO 2 can be reduced by aluminum forming silicon and Al 2 O 3, consequently reducing the SiO 2 content in the slag. It would make ...

The slag generated from the pre-reduction-smelting separation process are called "aluminum-rich slag" in which the Al 2 O 3 content was increased to about 43.17% while the Fe content decreased to some 4.02%, meaning that iron was successfully separated from alumina. However, it is difficult to extract alumina from the aluminum-rich slag due ...

Slag of aluminum is a residue which results during the melting process of primary and secondary aluminum production. Salt slag of aluminum is hazardous solid waste according to the European Catalogue for Hazardous Wastes. Hence, recovery of aluminum not only saves the environment, but also has advantages of financial and economic returns. In ...

conducted to evaluate chloride removal using electrochemically generated aluminum hydroxide and lime. Kinetics of chloride removal was investigated and the system ... One of such process is recovery of the chloride ions from the aqueous solution by calcined MgAl-CO 3 layered double hydroxides (LDH) [5].

The chemical and mineral composition of the red mud from the Ural Aluminum Plant were studied by XRF, XRD, and Möss spectroscopy. Experiments on reductive smelting of red mud were carried out in a range of temperatures (1650–1750 °C) to recover iron from the aluminum production waste with maximum efficiency. It was found that it is possible to obtain pig iron with a high content of ...

Bauxite residue is treated for the recovery of aluminum and sodium by sintering with the addition of soda, metallurgical coke and other reagents such as CaO, MgO and BaO. A thorough thermodynamic analysis using Factsage 7.0™ software was completed together with XRD mineralogy of sinters with different fluxes and reagents additions.

The worldwide aluminium industry produces nearly five million tonnes of furnace waste each year. Known as dross, the residual waste material is produced from any process in which aluminium is melted, and is left behind after conventional recycling has been carried out. Traditionally, black (which has a much higher salt content) and white dross ...

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The facility is said to provide end-to-end green and sustainable solutions for the recovery of aluminium from dross and processing residual waste to manufacture steel slag conditioners. The steel slag conditioner briquettes have found wide acceptance in steel refining and helped the steel industry in reducing costs and improving productivity.

manganese slags at 1450 ° C. F IG 4 - Excess heat available from the metallothermic reduction of 100. grams of manganese-bearing slag by aluminium, aluminium-silicon and. silicon at 1450°C. F IG ...

indicated. Similarly, slag atlases are available for most common slag systems. Matte (liquid mixture of sulphides) smelting, which exploits the immiscibility between slag and matte, is used for metal extraction from sulphide ores. (Slide 9-14) The word hydro- is derived from a Greek word which means water. Separation steps involved

Recovery of valuable metals is just as important for recycling companies to earn money from processing. The aluminum and heavy metals are highly valuable materials to recover from the slags. the metals are turned into raw material for high-quality re-use at melters.

The kinetic behavior of Cr 2 O 3 reduction by iron melts containing carbon, aluminum and silicon were investigated at various conditions in order to understand effective slag treatment for recovery of chromium from stainless slag. It was found that the recovery rate of chromium was fairly slow, but it was considerably accelerated by the addition of some fluxes, such as Al 2 O 3 and SiO 2 to ...

The recovery of aluminium metal from dross has traditionally caused severe environmental issue with highly alkaline waste waters, a waste product that is rich in waste flux and that evolves ammonia gas on contact with water and can spontaneously combust if allowed to get wet A novel method developed in New Zealand claims to be an ...

Aluminium dross is composed of metallic aluminium and non-metallic compounds such as oxides, nitrides and carbides. The dross created during primary and secondary aluminium production can amount up to 1% of the total tonnage and may contain up to 90% aluminium metal. The conventional procedure for dross treatment is to use salt for separating the metallic aluminium and the non …

an aluminothermic process for the production of magnesium by the reduction of magnesium oxide from a mixture of magnesium oxide and calcium oxide, by means of a metallic reducing agent comprising at least 85 percent aluminum, in the presence of a molten calciumaluminate slag bath at a temperature of about 13001700*c. magnesium evolves from the molten slag as a vapor.

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A method of recovering titanium dioxide from a titanium oxide bearing raw material, such as e.g. steel slags rich in TiO2 includes the steps of grinding the titanium dioxide raw material, reacting the particulate raw feed material with sulphuric acid under specified conditions, digesting and filtering the resultant cake material containing titanyl sulphate, hydrolysing the titanyl sulphate and ...

Aluminum, ferrosilicon and graphite were used as reductants under conditions of 1 723-1 823 K and various slag compositions. In the experiments, the formation of high Al 2 O 3 solid phase in the upper and middle parts of slag prevented uniform reduction when aluminum was added as a reductant, although FeO and CrO X were reduced drastically to a ...

US2653868A US19303250A US2653868A US 2653868 A US2653868 A US 2653868A US 19303250 A US19303250 A US 19303250A US 2653868 A US2653868 A US 2653868A Authority US United States Prior art keywords slag iron copper nickel amount Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

The molten free aluminum is recovered. The dust recovered from the furnace which is about 99% aluminum oxide is passed to a bag house. The slag which forms on the furnace walls is scraped from the furnace and is preferably recharged to the furnace with additional dross. The preferred furnace, as shown in FIGS. 2 and 3, is a tilting, rotating ...

A method of recovering a metallic aluminum from an aluminum-containing slag of an aluminum smelting process. In this method, the slag is crushed a number of times with each crushing product being separated by a screening off removing the metallic aluminum before the next crushing stage. Water-soluble components are then removed from the slag by leaching and the leaching solution is …

It was obvious that the Al reductant and the extended time did not affect the recovery rate of calcium. The recovery rates were 3% to 19% in the first experiments. Then, Al stoichiometry was increased to 125%, and the recovery rates were 5–21%. After 150% Al stoichiometry was tried, the recovery rates were 5–20%.

A process for recovering iron from preliminarily decopperized molten copper smelter slags having an initial composition which includes iron oxide, silica, and aluminum oxide as the major constituents. These constituents are initially present in the range of 40-70 percent FeO, 25-40 percent SiO 2 …

In both cases there is an increased oxidation of aluminum. Metallic aluminum from slag. Reducing the amount of slag in aluminum smelting is a top priority for foundry workers. Maximum recovery of aluminum metal from slag, which has already been removed from the melt and is outside the furnace is another important task.

The technology for aluminium recovery from various Al slag, for environment depolution ... Download full-text PDF. Read full-text. ... Join for free.

Although aluminum is one of the most abundant metals in earth's crust, its first isolation was succeeded in 1825 by Christian Ørsted who firstly gained anhydrous aluminum chloride [].Since aluminum is an ignoble metal with a very low standard potential (Al 3+ + 3e − ⥨ Al) of −1676 V [] and a high oxygen affinity (free Gibbs energy 2Al + 2/3O 2 ⥨ Al 2 O 3 of −1582,207 kJ/mol ...