distinguish between ammonia chloride and magnesium chloride on the bases of partical present
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Hydrometallurgical Process
Magnesium is rapidly leached from the serpentine in hot concentrated hydrochloric acid to form soluble magnesium chloride and insoluble amorphous silica, which is pseudomorph of the original serpentine particles.
(10.27)Mg3Si2O5(OH)4+6HCl→3MgCl2+2(SiO2)amorphous + 5H2O
At 100 °C, the initial rate of magnesium dissolution from 230 g/L of asbestos tailings increases as the 0.3 power of the HCl concentration. The terminal magnesium concentration increases with concentration of the acid up to 5.0 M HCl, but is insensitive to higher concentrations of acids, indicating the nearly complete leaching of all the available magnesium. The leaching of iron parallels that of magnesium, but iron repreeipitates from the weakly acid media. Minor amount of silica is also leached, but the extent of silica dissolution increases as the acid concentration decreases. The silica concentration rises rapidly to a maximum value (< 0.5 g Si/L.) and then declines gradually to some terminal value. Both the maximum and terminal silica concentrations decrease as the concentration increases. The rate of magnesium dissolution in 7.0 M HCl increases moderately with increasing temperature. The rate of dissolution of iron is less temperature dependent, presumably because of the presence of easily leached magnetite. The magnesium leaching rate is nearly independent of the particle size of serpentine for particles 12–1000 μm range. This is thought to be the result of the diffuse nature of the reaction zone (Dutrizac et al., 2001).
The magnesium chloride is hydrolyzed by steam to produce magnesium hydroxide, from which magnesium metal is produced by carbon reduction of the oxide.
Magnesium is rapidly leached from the serpentine in hot concentrated hydrochloric acid to form soluble magnesium chloride and insoluble amorphous silica, which is pseudomorph of the original serpentine particles.
(10.27)Mg3Si2O5(OH)4+6HCl→3MgCl2+2(SiO2)amorphous + 5H2O
At 100 °C, the initial rate of magnesium dissolution from 230 g/L of asbestos tailings increases as the 0.3 power of the HCl concentration. The terminal magnesium concentration increases with concentration of the acid up to 5.0 M HCl, but is insensitive to higher concentrations of acids, indicating the nearly complete leaching of all the available magnesium. The leaching of iron parallels that of magnesium, but iron repreeipitates from the weakly acid media. Minor amount of silica is also leached, but the extent of silica dissolution increases as the acid concentration decreases. The silica concentration rises rapidly to a maximum value (< 0.5 g Si/L.) and then declines gradually to some terminal value. Both the maximum and terminal silica concentrations decrease as the concentration increases. The rate of magnesium dissolution in 7.0 M HCl increases moderately with increasing temperature. The rate of dissolution of iron is less temperature dependent, presumably because of the presence of easily leached magnetite. The magnesium leaching rate is nearly independent of the particle size of serpentine for particles 12–1000 μm range. This is thought to be the result of the diffuse nature of the reaction zone (Dutrizac et al., 2001).
The magnesium chloride is hydrolyzed by steam to produce magnesium hydroxide, from which magnesium metal is produced by carbon reduction of the oxide.
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