Skorpion Leaching Process

SKORPION ZINC: OPTIMISATION AND INNOVATION

The Skorpion process was developed to treat a complex non-sulphide oxide ore body using atmospheric leaching followed by solvent extraction and electrowinning of zinc (1,2,3) . Sauconite is the largest contributor to the zinc grade with lesser amounts of zinc hydroxides. The gangue …

Development of a viable process for the T recovery of …

The whole-ore-leaching concept applied at Skorpion Zinc in Namibia relies on the economical leaching of zinc minerals with sulphuric acid solutions under atmospheric conditions. Economic viability is premised on the selective mining of the zinc oxide ore from a limestone pit shell. Subsequent to the successful commis-

Chemical Processing: Hydrometallurgy | SpringerLink

4.1 Precipitation. Precipitation is one of the important and widely used industrial process steps for the recovery of metals from different solutions. The development of innovative iron precipitation techniques such as hematite and jarosite allows the hydrometallurgical process to recover zinc commercially from leach solution obtained from sulfuric acid leach of roasted zinc concentrates.

Zinc Extraction; In Brief Review from Past to Present

This inspired a North American industry to procure additional metal from ores not conforming to the standard method. In British Columbia and Anaconda, Montana, the electrolytic Zn process and leaching of large tons of ZnO by H 2 SO 4 were introduced. The process is mainly based on the patent issued by I. Letrange in France in 1881 (Habashi 1993).

Review of the hydrometallurgical processing of non-sulfide …

The Skorpion process has three processing steps, i.e., direct atmospheric leaching in sulfuric acid, zinc solvent extraction, and electrowinning, to produce special, high-grade …

Investigation of secondary zinc oxides as an alternative feed …

Skorpion Zinc leaching conditions. The Skorpion Zinc process consists of three major steps, namely atmospheric leaching, solvent extraction, and electrowinning. Of primary interest for the first part of the study is the atmospheric leaching stage, which treats ore that has been crushed and milled to 80% passing 180 μm. The leaching section ...

Process Design Principles | SpringerLink

However, more complicated extraction processing occurs for some industries such as the gold industry, which often utilizes an acid leaching pretreatment process for sulfide ores that is followed by neutralization and subsequent leaching in cyanide solution as illustrated in Fig. 10.2. The neutralization step is necessary to make the transition ...

Evaluation of processing options for the treatment of …

considerations for a suitable process for Skorpion Zinc are: A process with more favorable economics will be preferred. This implies low operating and capital cost ... The leaching process takes place in a sulphate medium at low pH. Zinc sulphide is leached by ferric as an oxidant. The ferric is regenerated by oxygen and bacteria.

Leaching of secondary zinc oxides using sulphuric acid

Leaching test work showed that it would be possible to obtain recoveries in excess of 93% on the EAF dust, 96.9% from the zinc dross and 98% from the flue dust samples in the Skorpion process, using the normal process conditions of 50°C, a pH of between 1.8 and 1.85 and a slurry feed containing 20% solids. Literature suggested that increasing ...

Hydrometallurgical process for zinc recovery from

Hydrometallurgical process for zinc recovery from electric arc furnace dust (EAFD). Part II: Downstream processing and zinc recovery by electrowinning ... In Anglo-American's Skorpion Zinc refinery, after leaching with sulphuric acid, impurities such as iron, aluminium, and silica are removed from the solution by precipitation. Zinc is then ...

Review of the hydrometallurgical processing of non-sulfide zinc ores

The Skorpion process has three processing steps, i.e., direct atmospheric leaching in sulfuric acid, zinc solvent extraction, and electrowinning, to produce special, high-grade zinc. Fig. 3 shows Skorpion's simplified flowsheet of the process. The leaching process is conducted in a series of agitated tanks at about 50 °C. The final pH is ...

Skorpion Zinc Mine

Skorpion is the first commercial application of zinc SX-EW for processing primary leach liquor. Crushed ore is homogenised and wet milled. The refinery comprises basic zinc sulphate production, SX, EW and melting / …

EVALUATION OF PROCESSING OPTIONS FOR THE …

Skorpion Zinc. Leaching kinetics of zinc sulphides are significantly slower than those of oxides, preventing the processing of zinc sulphides in the existing process. ... pyrometallurgical or the RLE process at Skorpion will therefore increase the business risk. Having your primary business linked to another market, especially a by-product ...

Skorpion Zinc Refinery Conversion and Expansion Project

o To enable Skorpion Zinc Refinery to process zinc sulfide concentrates into refined metal. o Will enable co treatment of oxide and sulfide concentrates. o The primary source of zinc sulfide concentrate is Gamsberg operation in the Northern Cape. Target Gamsberg capacity 450kT per annum o Gamsberg to stop selling concentrates and send to Skorpion

Skorpion Zinc – Vedanta Zinc International

Once completed, the Refinery will process zinc concentrate from Vedanta Group companies located in South Africa, add value in Namibia, and export the refined product. NAD 6.5 billion has been set aside for the future of Skorpion Zinc which is promising massive Socio-Economic benefits with a projection of approx. 1 300 direct employment, 12 730 ...

A review of the modified zincex® process from skorpion to horsehead

The Skorpion process comprises three processing steps-atmospheric leaching in sulfuric acid, zinc solvent extraction and electrowinning to produce special high grade zinc.

Skorpion Zinc: Optimisation and Innovation | Request PDF

The Skorpion process comprises three processing steps, atmospheric leaching in sulphuric acid, zinc solvent extraction and electrowinning to produce special high grade zinc. …

Solvent extraction in the primary and secondary recovery …

concentrates [5]. Leaching with ferric chloride was followed by SX with pentylpentylphosphonate and EW in their patented Metclor cell. Another process for the treatment of concentrates proposed leaching in concentrated ammonium chloride, followed by zinc SX using D2EHPA modified with isodecanol [6].

2013 The Modified Zincex Process

Figure 3: Main process stages of the Modified ZINCEX TM Process Leaching is carried out at proper conditions to produce a Pregnant Liquor Solution (PLS) of very ... suitability of the electrolyte for any commercial Electrowinning process. Figure 5: Schematic of the Skorpion Zinc SX flowsheet. Source Skorpion Zinc and TR; ISEC 2011.

Upcoming Zinc Mine Projects: The Key for Success is

The Modified Zincex Process is a modification and simplification of the former process using atmospheric leaching, solvent extraction and conventional electrowinning, in order to resolve impurity ...

v118n7a5 Investigation of secondary zinc oxides as an

Skorpion Zinc and the alternative oxide suppliers. Zinc dross was generally more profitable to process than EAF dust, despite its higher freight costs. 86 41,/ leaching, process economics, secondary zinc oxide. * Skorpion Zinc Mine, Rosh Pinah, Namibia. † Department of Process Engineering, University of Stellenbosch, South Africa..

THE INFLUENCE AND BENEFITS OF AN UPSTREAM …

The Skorpion Zinc process involves atmospheric leaching of the silicate ore, upgrading and purification of the pregnant leach solution (PLS) by SX, and zinc recovery by EW. Details of the flow ...

Zinc and Lead Solvent Extraction and Electrowinning

The Skorpion process comprises three processing steps: direct atmospheric leaching in H 2 SO 4, Zn SX, and EW, to produce special, high-grade Zn (Abkhoshk et al. …

(PDF) Investigation of secondary zinc oxides as an alternative …

Skorpion Zinc processes zinc oxide ore using a sulphuric acid leaching, solvent extraction, and electrowinning process to produce Special High Grade zinc.

[PDF] Skorpion Zinc : optimization and innovation | Semantic …

The Skorpion process comprises three processing steps-atmospheric leaching in sulfuric acid, zinc solvent extraction and electrowinning to produce special high grade zinc. …

SOLVENT EXTRACTION IN ZINC PRODUCTION FROM

The process flowsheet represents a radical departure from classical zinc refineries in the use of atmospheric leaching of the high-silica oxide ore, followed by solution purification by solvent ...

v118n7a3 Investigation of secondary zinc oxides as an

as an alternative feed to the Skorpion Zinc process: Part 1 — leaching ... of iron in the leaching process (Langová, Riplová, and Vallová, 2007; Oustadakis et al., 2010). Zinc is found mainly

OneMine | Iron Removal in the Skorpion Process

Purchase this Article for $25.00. As the first mine-to-metal zinc operation utilising atmospheric leaching, solvent extraction and electrowinning, Skorpion Zinc faces unique …

SOLVENT EXTRACTION IN ZINC PRODUCTION FROM

departure from classical zinc refineries in the use of atmospheric leaching of the high-silica oxide ore, followed by solution purification by solvent extraction, and the electrowinning of ... Simplified process flowsheet of the Skorpion Zinc refinery [4]. Técnicas Reunidas were responsible for the provision of the SX technology, which is ...

Evaluation of processing options for the treatment of zinc …

The Skorpion zinc oxide resource will be depleted by 2017. Extensive exploration drilling for additional zinc oxides was conducted without success. ... was conducted to identify a suitable process. It is concluded that ferric leaching of sphalerite in a sulphate medium under atmospheric or pressure leach conditions are suitable processes for ...