Processing method of chemical nickel phosphor plating

Abstract

The invention discloses a treatment method of chemical nickel phosphor plating waste liquid, and relates to the comprehensive recovery and utilization field of chemical plating waste liquid. Under the condition of not adding any catalysts such as Pt salt and the like, and without external heating, the method utilizes sodium hydroxide dissolution, heat produced in the process of neutralization reaction and local high temperatures between liquid-solid interfaces, high pH value, and NaOH, and is induced by crystal nucleus provided by Ni2, therefore, the waste liquid is impelled to carry out self decomposition, and Ni-P alloy solid particles are generated. Under the action of the self decomposition of the Ni-P alloy solid particles, the waster liquid is decomposed quickly and completely, nickel is transformed into Ni-P alloy and then settled and separated out. More than 96 percent of nitrogen is transformed into ammonia, and phosphor, residual nitrogen, and majorities of organic acid are transformed into magnesium salt and calcium salt compound fertilizer. After the recycled nickel and phosphor resources are subjected to comprehensive recovery treatment, the nickel and the nitrogen contained in the waste liquid reach the national first-level discharge standard, and the phosphor and COD reach the national third-level discharge standard.

Description

technical field [0001] This patent relates to the field of comprehensive recycling of chemical waste liquid, in particular to a treatment method for electroless nickel-plating phosphorus waste liquid. Background technique [0002] Due to its high corrosion resistance, high wear resistance, high uniformity, high corrosion resistance and special magnetic properties, electroless nickel-phosphorus alloys are widely used in the fields of machinery, electronics, chemical industry, aerospace and other fields. The main way of hard chromium plating process that causes serious pollution. However, the electroless nickel-phosphorus alloy plating solution has a certain service life. The scrap plating solution contains nickel ions 2-8g / L, phosphite about 100-200g / L, sodium sulfate>80g / L, ammonia nitrogen 10-20g / L, chemical oxygen demand (COD)>200g / L and Trace amounts of other metal impurities, etc. On the one hand, the waste plating solution contains available resources, such as ...

AI Technical Summary

Problems solved by technology

Because this method uses noble metal salts as catalysts and metal nickel, iron, etc. as inducers, the cost of raw materials is very high, and the waste liquid needs to be preheated to about 80°C, which has high energy consumption and does not meet the requirements of the current energy-saving society. practically difficult to use

These two chemical methods have complex processes, and only nickel ions and part of phosphorus can be recovered and processed.

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