Project's information

Project's title Completing and processing technology applications in the industrial solid waste from chrome, nickel into trial production to recover useful metals and thorough handling of waste environmental final
Research hosting institution Institute of Materials Science
Project leader’s name Dr Pham Duc Thang
Project duration 01/01/2013 - 01/01/2014
Project’s budget 750.000.000 VND
Classify Excellent
Goal and objectives of the project

- Improving and developing the technological process of recycling waste residue after plating Cr, Ni Ni to recover metals or compounds containing valuable Ni, Cr, Fe, thereby reducing the toxic agents from the needle heavy metal residues in the final.
- Modulation of specific products (nickel metal, ferro chrome nickel) from the elements recall.
- Improving the environmental remediation measures of final waste and the waste generated during processing and recycling of solid residues.

Main results

a. Science:
- categorize groups other residues have different origins as a basis for the recycling of waste from electroplating reasonable. In particular note the following issues:
+ Residues containing mainly electroplating Ni, Cr, Fe, then immediately apply hydrometallurgical processes eliminate impurities Cr, Fe by weak alkaline nickel content if > 5%. Waste residue remaining after solvent extraction or bauxite residue ≤5% nickel content, the continued application process for smelting refining fire to recover the radical ferro heavy metals.
+ Electroplating waste residue containing more heavy metal elements such as Cu, Zn is necessarily apply hydrometallurgical process for separating air max recovered them. Waste solvent extraction residue is then continued application process for smelting refining fire to recover the radical ferro heavy metals.
- Completing the hydrometallurgical process solvent extraction residue, which apply effective way to remove impurities Cr, Fe, Cu, Zn to clean or service creates recovery of nickel sulfate in the preparation of the electrolyte material.
- Suggest finishing process stages are recycled electrolyte after the cycle electrolysis using oxalic acid precipitation of nickel ion and nickel oxalate processing the electrolyte are high purity for reuse.
- Improving manufacturing processes form the cathode mixture to foam SLS-1 reduced the humus sludge generated during electrolysis.
- Completing the electrolytic process according to the plans connected to the anode and cathode electrodes, ensuring basic investment costs for electricity distribution system (mainly plant-level line 10 times cheaper than its supply lines under principle of parallel connection). At the same time simple operating procedures and ensure effective.
- Completing the process of waste generated by the process.
- Selection is approximately 3 material system CaO - SiO2 - Al2O3 suitable for smelting residues into ferro chrome nickel alloy.
- Determining the influence of agents to efficiently and quality of products smelting.
- Construction process of ferro smelting residues
- Already registered intellectual property ferro nickel smelting process residues from electroplating and accepted applications.
b. production testing:
- Apply hydrometallurgical process technology has been perfected to produce 3025 kg of nickel electrolyte purity> 99% from 100 tons of fresh residues
- Application of fire training process technology has been developed to produce 15,030 kg of ferro chrome nickel quality indicators meet with registration from hydrometallurgical residue after solvent extraction.

Some images of the project:

Novelty and actuality and scientific meaningfulness of the results

- Complete the process hydrometallurgical technology to recover valuable metals nickel high residue from electroplating meet purity above 99%
- Develop a training fire technology allows recovery of these metals smelting capacity and the ferro chrome nickel residue quality
- Conduct application process technology perfected and developed to recycle waste from electroplating, metal fabrication out electrolytic nickel with over 99% purity ferro chrome and nickel are high quality reached and exceeded subscribe.

Products of the project

- Patents, Utility Solutions (listed): Fully apply the patented invention and the application has been accepted.
- The specific product (product description, store): 3025 kg electrolytic nickel in 99% purity ferro chrome and nickel 15030kg quality exceeded the registration criteria. All products by unit counterpart Corporation Environmental Materials and storage.
- Other products (if any): 01 graduate students defended Master

Research region

JSC Materials and Environment