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Method for treating metal-containing solutions

A solution and metal technology, applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve problems such as explosion and combustion hazards

Inactive Publication Date: 2007-01-24
BOC GRP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The waste plating solution will also volatilize a large amount of hydrogen gas, which poses the danger of explosion and combustion

Method used

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  • Method for treating metal-containing solutions

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Experimental program
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Effect test

Embodiment

[0046] One embodiment of this method is further illustrated by the following example. This example does not constitute a limitation of the method in any way.

[0047] The used electroless plating solution containing cobalt ions as oxidizing agent and dimethylamine borane (DMAB) as reducing agent was treated as follows to prevent plating out and spontaneous generation of hydrogen gas.

[0048] Step 1: As described above, the spent electroless plating solution is brought into contact with the anode (ie, as the anolyte). The catholyte was an aqueous solution of ferric sulfate. When current is applied, the oxidation reaction at the anode is: DMAB→DMA+B(OH) 3 +6e - ; the reduction reaction at the cathode is: . The anolyte and catholyte were then removed from the device.

[0049] Second step: The used electroless plating solution from the above step (ie the solution in which DMAB was just oxidized) was contacted with the cathode (ie as the catholyte). The anolyte is an a...

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PUM

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Abstract

A method for treating an electroless plating liquid or other metal-containing solution that also contains reducing agents. The method includes providing a reaction vessel containing an anode, a cathode, and a hydrogen ion-permeable membrane separating the anode and the cathode, placing the metal-containing liquid in contact with the anode, placing a catholyte solution in contact with the cathode; driving an electrical current through the anode and the cathode to oxidize the reducing agents present, and removing the used catholyte solution and the partially treated liquid from the electrodes, optionally from the reaction vessel to separate reservoirs. The partially treated liquid and an anolyte solution are placed in contact with the cathode and anode, respectively, and a current is again driven through the anode and cathode, plating a majority of the metal ions onto the cathode. The steps of oxidizing the reducing agents and plating the metal ions may also be reversed in order.

Description

field of invention [0001] The present invention relates to methods and apparatus for the treatment of metal-containing solutions by electrolysis. The method and apparatus provide for the removal of metals from a solution, rendering the solution environmentally acceptable for disposal, and the recovery of valuable metals from the solution. Background of the invention [0002] Electroless coating is a common method for introducing metallic coatings on objects. To coat a target by electroless plating, a metal compound is put into solution and a chemical reaction subsequently deposits the elemental metal. Electroless coatings can be used to form highly uniform coatings of metals such as nickel, copper, silver, gold, platinum or palladium on objects. Electroless coating methods are often used in the electronics industry, such as in the processing of semiconductor wafers. [0003] Over time and with continued use, the electroless plating solution becomes consumed and / or becomes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/00C02F1/461
CPCY10S210/912C02F1/46104C02F2103/16C02F2209/008C02F2101/325C02F1/46
Inventor J·R·克拉克J·江巴瓦拉
Owner BOC GRP INC