Topic
Speiss
About: Speiss is a research topic. Over the lifetime, 67 publications have been published within this topic receiving 393 citations.
Papers published on a yearly basis
Papers
1 Oct 2018
TL;DR: In this paper, the authors investigated pyrometallurgical treatment of jarosite residue to convert the material into reusable clean slag and to recover the valuable metals within the residue, and they concluded that the limiting factor in sulfur, lead, and zinc removal is the contact between the oxidizing or reducing gas and the molten sample.
Abstract: In electrolytic production of zinc, the iron levels in the solutions are controlled by precipitation of jarosite or goethite. These precipitates also co-precipitate unrecovered valuable metals (Zn, Pb, Cu, Ag) as well as elements of concern (As, Cd, Hg). After stabilization, the residues are traditionally landfilled. This work investigates pyrometallurgical treatment of jarosite residue to convert the material into reusable clean slag and to recover the valuable metals within the residue. The pyrometallurgical treatment is divided into two functional steps. First, the material is melted in an oxidizing atmosphere, after which the oxide melt is reduced to produce an inert, clean slag. Then, a liquid metal or speiss phase collects the valuable metals, such as silver. The aim was to examine the optimal process conditions for reaching the target values for remaining metals in the slag; Pb < 0.03 wt %, Zn < 1 wt %. As a conclusion, the limiting factor in sulfur, lead, and zinc removal is the contact between the oxidizing or reducing gas and the molten sample. The mass transfer and volatile metals removal were significantly improved with a gas lance installation. The improved gas-liquid interaction enabled the first steps of gas flow rate optimization and ensured the sufficiently low end-concentrations of the aforementioned elements.
35 citations
Patent•
23 Aug 1990
TL;DR: In this article, the waste material is processed to recover the useful and valuable materials (Zn, Cd, Pb, Ag), and bind the toxic elements (As, Sb, Bi) as an environmentally acceptable slag.
Abstract: Metallurgical waste materials, which are environmentally unacceptable for such applications as land fill, storage in open dumps and plastic lined ponds, because of the contamination of the ground water, may be processed to recover the useful and valuable materials (Zn, Cd, Pb, Ag), and bind the toxic elements (As, Sb, Bi) as an environmentally acceptable slag. The waste material contains (a) at least one iron compound, which may be an iron or mixed oxide, (haematite, goethite, ferrites and jarosites), (b) at least one heavy metal, (Zn, Pb, Cd), which is recoverable under strongly reducing conditions and volatilization and (c) at least one toxic element, (As, Sb, Bi), which is separated from the iron and stabilised in the matte or speiss phase. This waste material is subjected to a smelting operation in chamber (12) of a top submerged lance reactor (1) or bottom blown reactor, in the presence of a carbonaceous reductant, such as coal or char, charged through inlet (16) via rotary controller (14), by submerged injection through a lance (20) or tuyeres, of a fuel (oil, natural gas or fine coal), and an oxygen bearing gas, (air, oxygen-enriched air, oxygen, oxygen & inert gas). Strongly reducing conditions prevail at the surface of the melt (22) to cause volatilisation of Zn, Pb and Cd. The toxic elements, (As, Sb, Bi), are stabilised in the matte or speiss layer of the melt (22), together with some Zn, some Pb, Ag, Au, Cu, Ni and Co. As the melt circulates around the end of the lance (24) and the oxidising combusion zone associated therewith, the toxic elements, (As, Sb, Bi) are oxidised and volatilised, and exit with flue gases through offtake (18), either as the metal or (by oxidation above the melt) as the oxide. Furnace (10) has a slag notch (26), from which an environmentally acceptable slag, with low levels of toxic elements, may be tapped periodically or continuously. Lance (20) is shielded from its surroundings by a protective layer of slag (28) formed during the process.
34 citations
TL;DR: In copper metallurgy, antimony impurities usually form alloys and compounds with the transition metals to make up the basic building blocks of a speiss phase as mentioned in this paper, which is generally rich in antimony.
17 citations
TL;DR: In a Late Bronze Age hoard at Kanalski Vrh in Slovenia, bronze pendants were found among numerous other artifacts as discussed by the authors, which suggested that speiss was added to bronze, and most pendants had a silvery grey surface that differed from the common color of tin bronze.
16 citations
Patent•
7 Apr 1941
TL;DR: In this paper, a process of treating siliceous slags obtained in the smelting of ores, particularly of the type containing at least one of the elements sulphur and arsenic, for the purpose of recovering values was described.
Abstract: The present invention relates to a process of, treating siliceous slags obtained in the smelting of ores, particularly of the type containing at least one of the elements sulphur and arsenic by methods commonly known as pyrite, matte or speiss smelting, for the purpose of recovering values,...
12 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 3 |
| 2020 | 2 |
| 2019 | 1 |
| 2018 | 4 |
| 2017 | 1 |
| 2016 | 2 |