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    • 102. 发明授权
    • Method for the detinning of painted tinplate waste
    • 涂抹马口铁废物的方法
    • US4474655A
    • 1984-10-02
    • US534560
    • 1983-09-22
    • Hendrik Giezen
    • Hendrik Giezen
    • C25C1/14C25F5/00
    • C25C1/14
    • Detinning of tinplate waste is carried out by electrolysis with the waste acting as an anode immersed in an electrolytic bath containing NaOH. When detinning painted tinplate waste, in order to reduce the effect of the paint on the detinning process, the painted tinplate waste is first compressed, then immersed in an NaOH solution for sufficient time to allow the NaOH to soften the paint, and then the electrolysis is carried out in the same or a different solution, to remove the tin beneath the paint. Preferably the softened paint is not removed from the tinplate.
    • 马口铁废料的脱色是通过电解进行的,废水作为阳极浸在含有NaOH的电解槽中。 涂上马口铁废料时,为了降低涂料对脱色过程的影响,首先将镀锡的马口铁废料压缩,然后浸入NaOH溶液中足够的时间,使NaOH软化涂料,然后进行电解 在相同或不同的溶剂中进行,以除去油漆下面的锡。 优选地,软化的涂料不会从马口铁中除去。
    • 104. 发明授权
    • Process for electrodialytically controlling the alkali metal ions in a
metal plating process
    • US4229280A
    • 1980-10-21
    • US896058
    • 1978-04-13
    • Richard E. Horn
    • Richard E. Horn
    • B01D61/42C25D21/16B01D13/02C25C1/14
    • B01D61/46C25D21/16
    • In one specie a tin-plating bath contains an alkali metal stannate and generates an alkali metal hydroxide during the electrodeposition of tin. The tin-plating bath is circulated through the anode compartment of an electrodialytic cell that has a cation permselective membrane separating the anode compartment from the cathode compartment. The cathode compartment contains a suitable electrolyte and when a current is impressed across the electrodialytic cell, the alkali metal ions in the plating bath migrate through the permselective membrane into the cathode compartment and the stannate ions remain in the tin-plating bath in the anode compartment. The removal of the alkali metal ions from the tin-plating bath controls the alkali metal hydroxide content of the plating bath. The electrodialytic cell may be positioned in the tin plating bath and where feasible utilize the same power source as the plating bath. Where bath drag out is excessive and the amount of alkali metal hydroxide removed from the plating bath reduces the amount of treatment of the plating bath, the alkali metal stannate is recovered from the rinse water by passing the rinse water through a center compartment of a three compartment electrodialytic cell bounded by a cation and an anion or neutral permselective membrane. The stannate ions in the rinse water migrate to the anode compartment and are returned to the plating bath and the potassium ions pass to the cathode compartment. In an acid bath containing a tin fluoride complex with a fluostannite ion the excess alkali metal ions are removed from either the plating bath or the rinse water by passing the bath or rinse water through the center compartment of a three compartment electrodialytic cell that is bounded on both sides by a cationic permselective membrane. The cathode compartment contains an alkali metal hydroxide and the anode compartment contains an acid and an insoluble anode. The alkali metal ions are transferred from the center compartment to the cathode compartment thus removing the excess alkali metal ions from the bath and rinse water.