Method for recycling nickel resource from chemical nickel-plating spent solution

Abstract

The invention relates to a method for recycling a nickel resource from a chemical nickel-plating spent solution. The method comprises the steps that A, the pH value of the chemical nickel-plating spent solution is adjusted to 10.5-11.5; B, the temperature of the chemical nickel-plating spent solution is controlled in the range of 30-45 DEG C, and the chemical nickel-plating spent solution enters amembrane contactor to be deaminized; and C, after being deaminized, the chemical nickel-plating spent solution is directly reduced into a solid solution or an amorphous nickel-phosphorus alloy through residual sodium hypophosphite. The method has the following technological effects that the pollution problem of the chemical nickel-plating spent solution can be solved effectively, valuable metal nickel is also recycled; and used equipment is simple, high in recovery rate, low in cost, environmentally friendly, easy to implement and the like.

Description

technical field [0001] The invention relates to the technical field of industrial waste recycling, in particular to a method for recovering nickel resources from an electroless nickel plating aging solution. Background technique [0002] Electroless nickel plating is a kind of electroless nickel plating, directly under the action of hypophosphite, a strong reducing agent, to make N +2 A surface treatment technology for forming a Ni-P alloy coating on the surface of a catalytic coating. Its coating has the advantages of uniformity, corrosion resistance, hardness and weldability, and has been widely used in electronics, petrochemicals, auto parts, machinery manufacturing, aerospace and other fields. After the plating solution is used for several cycles, the by-product phosphite accumulates in large quantities, and produces insoluble white nickel phosphite precipitation with nickel ions, which reduces the quality of the plating layer, and even the plating solution is turbid. A...

AI Technical Summary

Problems solved by technology

The chemical precipitation process is simple and mature with low investment, but it has the following disadvantages: it is easy to cause secondary pollution, the amount of slag is large, the consumption of chemicals is large, and the introduction of new substances makes the system more complicated, etc.

The method has the following disadvantages: 1) a large amount of catalytic reducing agent is consumed; 2) the reaction temperature is as high as 80 to 85° C., which increases energy consumption; 3) the recovery rate is only 97%, and the raffinate nickel concentration is as high as 0.1g / L

This method has the following disadvantages: 1) the reaction temperature is high and the aging solution contains 7000-10,000 mg / L ammonia ammonia. Under the reaction conditions of high pH value and high temperature, the ammonia gas forms bubbles, which affects the environment and has high energy consumption; 3) The concentration of nickel in the raffinate is 3~5mg / L, which has not yet reached the standard

This method has the following disadvantages: 1) add a large amount of thiourea dioxide reducing agent; 2) the reaction temperature is high and the aging solution contains 7000~10,000mg / L ammonia ammonia, under the reaction conditions of high pH value and high temperature, ammonia forms bubbles, Affect the environment, and high energy consumption; 3) The recovery rate of nickel is low, and the concentration of nickel in the raffinate is as high as 0.1g / L

The method has the following disadvantages: 1) adding multiple additives, the operation is cumbersome and increases the cost; 2) using iridium dioxide-titanium alloy mesh plate as the anode, the equipment is expensive and increases the investment cost; 3) the nickel recovery rate is not high, and the residual The concentration of liquid nickel is 20mg / L, which is not up to the standard

[0009] Obviously, the recovery methods of nickel in several chemical nickel plating aging solutions introduced above have their own characteristics, but these methods all have certain shortcomings and application limitations, such as high processing costs, cumbersome operations and complicated processes, low nickel recovery rates, and emission concentrations. advanced questions

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