Leaching, agitation

Va.t, or Agitated Leeching. Vat or agitated leaching usually extracts copper from oxide or mixed oxysulfide ores containing more... 

By way of an example, one may consider the case of hydrometallurgical reactors. Leaching is the most important of the different unit operations, and is prominently placed and assigned due emphasis in a typical hydrometallurgical process flowsheet. A representative list of the various types of reactors used for agitation leaching is given in Table 1.21. 

Agitation, pilot plant, 18 730-731 Agitation leaching, 16 153 Agitation process, 9 165 Agitator dryers, 9 131-133 Agitators... 

Each element represents a resistance. If one resistance is controlling, a simple rate equation may be derived. For example, if the shell disintegrates and the liquid is vigorously agitated, leaching can be represented by the surface reaction rate equation,... 

Butler (B39) described the leaching of carnotite ores that contained high-vanadium-low-lime and low-vanadium-asphaltic-type minerals. The high-vanadium-low-lime ore (less than 2%) is roasted with 6-9 wt. % salt at 850°C and is immediately quenched in 3% hot sodium carbonate solution. The calcine is ground to 65 mesh and uranium and vanadium are dissolved by agitation leaching at 92-96°C. 93% of the uranium and 85% of the vanadium are extracted from the ore. The asphaltic tjq>e ore is roasted at 550°C and 80-85% of the uranium and 35-40% of the vanadium are extracted. The leach solution concentration was maintained between 7 and 9% sodium carbonate. The pulp density was between 45 and 50% solids. 

Agitation leaching is used with very finely divided ores which may have already been partially processed and would pack too tightly for percolation... 

Stand-alone atmospheric pressure agitated leaching tank (AL). 

S. Agatzini-Leonardou and I. G. Zafiratos, Benefication of a Greek Serpentinic Nickeliferous Ore Part II. Sulfuric Acid Heap and Agitation Leaching, Hydrometallurgy, 74 (2004), 267-275. 

E. Buyukakinci and Y.A. Topkaya, Extraction of Nickel from Lateritic Ores at Atmospheric Pressure with Agitation Leaching Hydrometallurgy, 97 (2009), 33-38. 

Two-step (ls2, IS2-10) or one-step (Isio) agitated leaching with deionised water on granular (<4mm) materials. Tested on equivalent of 100 g dry solids after removal and quanitification of non-crushable portion. 

Two step agitated leaching test at pH 7 and 4 on ground material... 

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