Concentration and decrement treatment method for chemical nickel waste liquid

Abstract

The invention provides a concentration and decrement treatment method for chemical nickel waste liquid. The concentration and decrement treatment method comprises the following steps: S1, carrying out low-temperature negative-pressure evaporation and concentration on the chemical nickel waste liquid at the temperature of less than 50 DEG C and under the negative pressure condition; and S2, carrying out medium-temperature concentration and drying on the chemical nickel concentrated liquid treated in the step S1 at the temperature lower than 220 DEG C. According to the technical scheme, a low-temperature negative-pressure evaporation and concentration process is adopted for treatment, the waste liquid can be evaporated only by heating to a low temperature, energy consumption is greatly reduced, the evaporation efficiency can reach a high level, and about 70% of the waste liquid can become steam condensate water. After secondary evaporation concentration treatment of low-temperature negative-pressure evaporation concentration and medium-temperature concentration, drying and reduction, about 85% of waste liquid is converted into steam condensate water, the steam condensate water enters a waste water treatment facility to be treated and discharged after reaching the standard, about 15% of the rest waste liquid is concentrated into solid substances, and the waste liquid reduction effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for concentrating and reducing chemical nickel waste liquid. Background technique [0002] In recent years, with the rapid development of science and technology, the application field of electroless nickel plating has been expanding. Due to the simple electroless nickel plating process, strong practicability and many superior characteristics, the electroless nickel plating technology has developed rapidly. However, the heavy metal ions in the chemical nickel wastewater have caused serious environmental pollution, which has attracted widespread attention, especially in order to improve the quality of the electroless plating layer and the stability of the plating solution, various complexing agents and stabilizers added in the chemical plating solution Organic substances such as brighteners and brighteners are more harmful to the environment, and...

AI Technical Summary

Problems solved by technology

However, the heavy metal ions in the chemical nickel wastewater have caused serious environmental pollution, which has attracted widespread attention, especially in order to improve the quality of the electroless plating layer and the stability of the plating solution, various complexing agents and stabilizers added in the chemical plating solution Organic substances such as brighteners and brighteners are more harmful to the environment, and the existence of these organic substances has brought difficulties to the removal of nickel and phosphorus ions in the waste liquid.

Due to the complex composition of electroless plating solution and wastewater, including inorganic salts, complexes, organic matter, etc., the treatment of electroless nickel plating wastewater is difficult, and any single method cannot achieve a good treatment effect.

At present, the treatment of waste liquid and wastewater mainly adopts chemical precipitation method, electrolysis method, ion exchange method, catalytic reduction method, electrodialysis method, membrane osmosis method, biological method, etc., some of which are combined use of two or more methods, and some treatment methods Although the effect is good, the cost of waste liquid treatment is high, and it is difficult to promote and use it in small electroless nickel plating enterprises