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Further, a large percentage of the quartz in semi-taconite ores is stained with iron and thus remains with the iron concentrate in either an amine float or a calcium-activated silica float. It is well-known that silica can be floated by calcium and magnesium ion activation with an anionic collector. The insoluble material is largely quartz. Thus, a calcium-activated silica float does not lend itself to rejecting a large quantity of coarse silica tailing as a preliminary scalping operation. This procedure has the advantage of minimum difiiculty with slimes, but the cores require rather fine grinding and the float seems to be inherently weak and the treatment is very expensive. Although it is possible to float much coarse silica with various amines, the reagent cost is high and, in general, amine flotation procedures are extremely slime sensitive.The iron in semi-taconites is present largely in the form of goethite and hematite with minor amounts of magnetite.
The target fineness was defined to be 4% residue on a 90 microns sieve, whereby FIG.04 wt-% amine (polyamine) and 10 wt-% blast furnace slag, wherein a significant improvement was achieved when compared to the admixture of only inorganic additives.The mixture was ground in a vertical ball mill. The corresponding graphs are depicted in FIG. 4. The best results have been achieved with an admixture of 0. The energy at the mill shaft was measured as a function of the grinding fineness. 4 shows the corresponding horizontal line.
b Due to the multifaceted possibilities of rotation and section choice, the largest in situ block can be detected in the lower right back part of the treated rock mass. 5.a Three-dimensional model of the quarry section of the Löbejüner Qtz-Porphyry shown in Fig.
In: Proceedings of the 2nd international conference on acid rock drainage (ICARD), Montréal, Canada, vol 3, pp 489–506.Miller SD, Jeffery JJ, Wong JWC (1991) Use and misuse of the acid base account for “AMD” prediction.
Except for AC120, very little difference in gravimetric energy density among the type of ACs was observed at the lower gravimetric power density ( 1000 W kg−1). Under a very high current density ( 20 mA cm−2), the gravimetric specific capacitance of AC120 was measured to be negligible. Under the very high gravimetric power density ( 2000 W kg−1), AC90 displayed the highest gravimetric energy density of all the ACs. At the higher current density ( 10 mA cm−2), the ACs allowed a decline of the gravimetric specific capacitance, where the degree was dependent on the milling time. From the gravimetric Ragone plots, the highest gravimetric energy density of 39.0 W kg−1. The gravimetric specific capacitances of all the ACs were maintained up to the current density of 5 mA cm−2. The nonmilled AC (AC0) displayed the highest gravimetric specific capacitance of 183 F g−1, while the AC subjected to the longest milling (AC120) had the lowest value ( 160 F g−1).The gravimetric and volumetric specific capacitances, and the gravimetric and volumetric Ragone plots for all the ACs are shown in Figure 7.3 Wh kg−1 was observed on AC0 at the gravimetric power density of 12. AC10 and AC90, which had middle levels of Dave, could retain a high gravimetric specific capacitance.
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