Method and arrangement for depositing a metal coating
A metal and coating technology, applied in the field of devices implementing the method, can solve problems such as expensive
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Embodiment 2
[0061] To treat baths according to the invention, use figure 2 stated in the basis of figure 2 Structure of the chamber filter press 20 device.
[0062] By using a chamber filter press 20, the sludge-like precipitate is separated into a filter cake 93 and a filtrate. The filtrate is fed back into bath 10 . By using the method performed according to the invention, the amount of thiourea adhering to the precipitate can be reduced to 103 g / h by pressure filtration. As a result, the amount of thiourea to be added per hour can be reduced by 31% to 457 g / hour. Together with other bath components, the cost saving is about 30% in terms of filter cake disposal and easier recirculation.
Embodiment 3
[0064] To dispose of the bath, use figure 1 described in has image 3 The experimental setup of the first storage tank (sludge tank) 42 of the structure. The sludge tank contains a cooling device 96 operated with cooling water (4° C.), a stirring device 97 and a level sensor 98 . Reference numeral 95 refers to the line from the settling tank (crystallizer) 18 , while reference numeral 94 refers to the line to the filtration device 20 .
[0065] Cooling with cooling device 96 makes it possible to temporarily store the bath to maintain cooling regardless of the ambient conditions. The sludge content (c (solid)) generated by the settling tank 18 and the residual copper content (c (Cu)) in the bath have temperature dependence. In order to determine the residual copper content and the solid content in the bath, the following experiments were carried out:
[0066] An additional 7 g / l of copper powder (particle size less than 63 microns) was added to 200 l of a bath having the co...
Embodiment 4
[0071] In order to determine the copper content of the separated precipitate, the bath used in Example 3 was cooled in a settling tank and the precipitate studied. For this purpose, further treat the precipitate-containing bath in the following different ways to separate the precipitate:
[0072] In a first experiment, the bath was filtered through a suction filter by pressure differential (vacuum applied at the end of the filtrate), whereby a very hard dry filter cake was formed. In a further experiment, a more or less wet precipitate was obtained by pure gravity filtration (comparative experiment). The resulting precipitate was then analyzed for copper content. The experimental results are shown in Table 2. The table also provides the amount of solid matter of the respective separated precipitates in relation to the amount of precipitate in the sample filter cake.
[0073] Table 2: Solid content and copper content in the isolated precipitate
[0074] sample
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