Recovery Method for High Purity Platinum
a recovery method and platinum technology, applied in the direction of process efficiency improvement, etc., can solve the problems of severe contamination, all mill ends become scraps, and portions that come into contact with the target become contaminated, and achieve the effect of superior ability
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example 1
[0048]In Example 1, scraps of a magnetic material target containing platinum, cobalt, chromium, and ruthenium were dissolved in aqua regia and residue was eliminated, and the resulting product was diluted in water to obtain an aqua regia solution having a platinum concentration of 30 g / L and a ruthenium concentration of 5 g / L.
[0049]The aqua regia solution and ammonium chloride were caused to react at 45° C. to obtain chloroplatinic ammonium salt ((NH4)2PtCl6) crystals. Subsequently, the crystals were roasted at 800° C. to obtain a platinum sponge, and the platinum recovery rate from the aqua regia solution and the ruthenium content rate as an impurity were measured. The results are shown in Table 1.
TABLE 1platinum recovery rateruthenium content rate(%)in the platinum salt (wt %)Example 199.50.5Example 299.30.3Example 399.21.7Comparative Example 196.00.6Comparative Example 299.52.3Comparative Example 399.23.5
[0050]As shown in Table 1, the platinum recovery rate reached 99.5%, and the...
example 2
[0051]In Example 2, scraps of a magnetic material target containing platinum, cobalt, chromium, and ruthenium were dissolved in aqua regia and residue was eliminated, and the resulting product was diluted in water to obtain an aqua regia solution having a platinum concentration of 18 g / L and a ruthenium concentration of 3 g / L.
[0052]The aqua regia solution and ammonium chloride were caused to react at 90° C. to deposit chloroplatinic ammonium salt, and the deposited chloroplatinic ammonium salt was roasted at 800° C. to obtain a platinum sponge, and the platinum recovery rate from the aqua regia solution and the ruthenium content rate as an impurity were measured. The results are shown in Table 1.
[0053]As shown in Table 1, the platinum recovery rate reached 99.3%, and the ruthenium content rate in the platinum salt decreased to 0.3 wt %. This ruthenium content was sufficiently decreased to use the recycled platinum as a target.
[0054]Moreover, similar platinum purity and ruthenium red...
example 3
[0055]In Example 3, scraps of a magnetic material target containing platinum, cobalt, chromium, and ruthenium were dissolved in aqua regia and residue was eliminated, and the resulting product was diluted in water to obtain an aqua regia solution having a platinum concentration of 16 g / L and a ruthenium concentration of 5 g / L.
[0056]The aqua regia solution and ammonium chloride were caused to react at 50° C. to deposit chloroplatinic ammonium salt, and the deposited chloroplatinic ammonium salt was roasted at 800° C. to obtain a platinum sponge, and the platinum recovery rate from the aqua regia solution and the ruthenium content rate as an impurity were measured. The results are shown in Table 1.
[0057]As shown in Table 1, the platinum recovery rate reached 99.2%, and the ruthenium content rate in the platinum salt decreased to 1.7 wt %. This ruthenium content was sufficiently decreased to use the recycled platinum as a target. Moreover, similar platinum purity and ruthenium reductio...
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