Recovery method of rhodium
A recovery method and high-yield technology are applied in the field of recovering solid rhodium, and can solve the problems such as undisclosed reduction conditions.
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Embodiment 1
[0024] As a raw material, the ammonium hexachlororhodate solution shown in Table 1 containing almost no metal other than rhodium was used.
[0025] Table 1
[0026]
[0027] In order to prevent the precipitation of ammonium hexachlororhodium acid, the liquid temperature before reduction is set as 60 DEG C, and calculate the theoretical amount of formic acid required for reducing rhodium with formic acid according to the following reaction formula, and then add formic acid equivalent to 3 times of its amount, Heat at 90°C for 1 hour.
[0028] 2(NH 4 ) 3 [RhCl 6 ]+3HCOOH→2Rh+6HCl+6NH 4 Cl+3CO 2
[0029] Then, it was left to cool overnight at room temperature, and vacuum filtered with a 0.1 μm membrane filter to obtain precipitated rhodium and a filtrate after reduction. The recovery rate of rhodium at this time was calculated by the following formula.
[0030] Rhodium recovery (%)=(Rh amount (g) in the liquid before reduction-Rh amount (g) in the filtrate after reduct...
Embodiment 2
[0034] [Example 2 and Comparative Example]
[0035] Use the ammonium hexachlororhodium solution shown in table 1 as raw material, adopt the condition identical with embodiment 1, only change the addition amount of formic acid and reduce, the analytical value of filtrate after the reduction of gained and the rate of recovery of rhodium are shown in table 3 in.
[0036] table 3
[0037]
[0038] The rate of recovery of rhodium corresponding to the formic acid addition amount of embodiment 1, embodiment 2 and comparative example is shown in figure 2 . As can be seen from the figure, by setting the formic acid addition as 2.5~5.0 times of the theoretical amount, the rhodium recovery rate more than 98% can be obtained, and then by setting the formic acid addition as 2.5~3.0 times of the theoretical amount, A recovery rate of more than 99% rhodium can be obtained.
Embodiment 3
[0040] The rhodium black obtained in Example 1 was reduced and fired at 800° C. under a hydrogen atmosphere to obtain rhodium sponge. By sintering, the remaining oxygen can be basically removed, and the impurities of 72 components (from lithium to uranium according to the atomic number, except rhodium and inert gases) were analyzed by GDMS. The results showed that 99.99% of the total amount of impurities was 84ppm. Rhodium in mass % or more.
[0041] As mentioned above, through Examples 1, 2, and 3, rhodium black can be recovered from the ammonium hexachlororhodate solution with a high yield under non-polluting conditions, and the obtained rhodium black can be recovered by burning the obtained rhodium black afterwards. of spongy rhodium.
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