Manganese extraction

Manganese Extraction with chloroformic 8-quinolol, back extraction Graphite furnace AAS < 30 ng/1 [432,444]... 

Manganese Extraction of manganese with a heptane solution of bis (2-ethyl hexyl) phosphate Spectrophotometric — [874]... 

Several treatments remove the peripheral polypeptides (Table 3). If these are carried out at high chloride concentration, manganese extraction is minimal if chloride is low, two of the four manganese ions are extracted. Kuwabara et al. found that the ability to reconstitute oxygen-evolution activity by polypeptide ad-... 

Fig. 4. mg/g of manganese extracted by the extracting solutions versus time. Experimental conditions as reported in the text... 

The data of Robinson (194) show that the chemical properties of the manganese oxide associated with the clay fraction are definitely different from those of the manganese oxide in the silt fraction of soils, as the manganese oxide in the clay fraction exhibited very little abihty to catalyze the decomposition of hydrogen peroxide. Furthermore, Robinson found that the amount of manganese extracted with IN ammonium acetate was about five times as great from the clay as from the silt fraction. 

FIGURE 10.29 Vertical profile of pore water Mn(II) and manganese extracted with CDB at the Skagerrak site. (Redrawn from van der Zee and van Raaphorst, 2004.)... 

The best extraction result for nickel was 64% at 80°C using 2.73 g of FeS04 / g of ore and 130 g/1 total ammonia over 8 hours. For both cobalt and manganese extractions, the best result obtained was 44% at 45 C using 0.37g FeS04/g of ore and 130 g/1 of total ammonia. 

Figure 2 Effect of temperature on cobalt and manganese extraction in ammonia solutions using ferrous sulphate as reducing agent at 600 RPM during 24 hours.

Results obtained from the present research suggest the limonitic laterite can be partially reduced by ferrous sulphate. Maximum nickel extraction was 64% at SO C, 2.73 g FeS04/ g of ore, 130 g/1 total ammonia in 10 hours. At the same conditions the cobalt and manganese extractions were only 16% and 43%, respectively. The different leaching behavior between nickel, cobalt and manganese is due to the fact that they are associated with different mineralogical phases. 

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