Processing method of chemical nickel phosphor plating

An electroless nickel-plating phosphorus and treatment method technology, which is applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage treatment, etc., can solve the problems of complex process, high cost of raw materials, high energy consumption, etc.

Inactive Publication Date: 2009-05-20
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 consumpt...

Method used

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  • Processing method of chemical nickel phosphor plating
  • Processing method of chemical nickel phosphor plating
  • Processing method of chemical nickel phosphor plating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add sodium hypophosphite to the waste liquid to adjust the nickel-phosphorus ratio of the waste liquid to 0.7, then add 80g / L NaOH solid until the pH of the waste liquid is 13, and the solution will be released rapidly in the form of ammonia gas during the decomposition process, making the waste liquid When the concentration of ammonia nitrogen drops to 150mg / L, follow n[NH 4 + ]:n[PO 4 3- ]:n[Mg 2+ ]=1:1:12 add MgCl 2 , generate magnesium ammonium phosphate, precipitate until the ammonia nitrogen content drops below 14mg / L and filter, add 10% CaO solution 10mL / L and 20% CaCl to the resulting solution 2 Solution 7mL / L, filter the precipitate after static precipitation.

Embodiment 2

[0037] Add sodium hypophosphite to the waste liquid to adjust the nickel-phosphorus ratio of the waste liquid to 1.5, and then add 110g / L NaOH solid until the pH of the waste liquid is 14. During the decomposition process, the solution will be released rapidly in the form of ammonia gas, making the waste liquid When the concentration of ammonia nitrogen drops to 200mg / L, follow n[NH 4 + ]:n[PO 4 3- ]:n[Mg 2+ ]=1:1:8 add MgCl 2 , generate magnesium ammonium phosphate, precipitate until the ammonia nitrogen content drops below 14mg / L and filter, add 10% CaO solution 12mL / L and 20% CaCl to the resulting solution 2 Solution 10mL / L, filter the precipitate after static precipitation.

Embodiment 3

[0039] Add sodium hypophosphite to the waste liquid to adjust the nickel-phosphorus ratio of the waste liquid to 1.0, and then add 50g / L NaOH solid until the pH of the waste liquid is 12. The solution is released rapidly in the form of ammonia gas during the decomposition process, making the waste liquid When the concentration of ammonia nitrogen drops to 100mg / L, follow n[NH 4 + ]:n[PO 4 3- ]:n[Mg 2+ ]=1:1:10 add MgCl 2 , generate magnesium ammonium phosphate, precipitate until the ammonia nitrogen content drops below 14mg / L and filter, add 10% CaO solution 15mL / L and 20% CaCl to the resulting solution 2 Solution 5mL / L, filter the precipitate after static precipitation.

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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 ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/58C02F103/16
Inventor 冯立明刘科高孙华
Owner SHANDONG JIANZHU UNIV
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