Method for preparing nano metallic nickel in spent electroless nickel plating solution

Abstract

The invention discloses a method for preparing nano metallic nickel in spent electroless nickel plating solution. The method comprises the following steps: adding 0.20 to 0.33 grams of reducer thiourea dioxide into every 100ml of the spent electroless nickel plating solution; then, adjusting the spent electroless nickel plating solution to be alkalic with 3 to 7 grams of sodium hydroxide, and heating the spent electroless nickel plating solution to the temperature of between 70 and 100 DEG C; reacting at constant temperature for 5 to 20 minutes, and cooling the solution to the temperature of between 10 and 30 DEG C; filtering the spent electroless nickel plating solution; and washing the filtered substances with deionized water and absolute ethanol respectively; and drying the substances in a vacuum drier to prepare the nano metallic nickel. The method effectively solves the problem of spent electroless nickel plating solution pollution, simultaneously recycles noble metal nickel, and realizes double assurance of social benefit and economic benefit for enterprises. Furthermore, the reducer thiourea dioxide has lower requirement to the reaction condition, less investment, no toxic or side effect and environmental protection.

Description

technical field [0001] The invention relates to the field of extraction of heavy metals, in particular to a method for preparing nanometer metallic nickel in waste electroless nickel plating solution. Background technique [0002] Heavy metal pollution has become a major environmental problem that threatens human health and life safety, and its harm has been paid more and more attention by people. Since there are more and more enterprises producing crystal resonator bases, the content of carcinogenic nickel in the electroless nickel plating waste liquid produced by them is relatively high, but at present, when dealing with nickel in the electroless nickel plating waste liquid, most of them use The reducing agent is hydrogen and hydrazine. After the nickel forms an ammonia complex, the hydrogen can reduce the nickel in the solution under high temperature and high pressure. The disadvantage is that the equipment investment is large, the reaction conditions are also high, and t...

AI Technical Summary

Problems solved by technology

Since there are more and more enterprises producing crystal resonator bases, the content of carcinogenic nickel in the electroless nickel plating waste liquid produced by them is relatively high, but at present, when dealing with nickel in the electroless nickel plating waste liquid, most of them use The reducing agent is hydrogen and hydrazine. After the nickel forms an ammonia complex, the hydrogen can reduce the nickel in the solution under high temperature and high pressure. The disadvantage is that the equipment investment is large, the reaction conditions are also high, and there is a greater risk; hydrazine It is a commonly used reducing agent for the preparation of metal nickel powder. It is extremely poisonous, has an irritating effect on the eyes, can cause delayed inflammation, and has a strong corrosive effect on the skin and mucous membranes.

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