Electroplating sludge treatment plan and metal recovery
Taking the three types of electroplating sludge samples sent by the customer as examples, treatment suggestions are provided from the experiment.
After sampling and leaching, the laboratory results of three sets of sample solutions were obtained. They are sample 1, sample 2, and sample 3. The ion content of heavy metals such as nickel, cobalt, manganese, magnesium, zinc, iron, copper, chromium, lead, calcium, etc. in the feed solution was detected to be different. These heavy metal ions are the main components of electroplating sludge and have great harm to the environment.
Based on the material liquid detection situation, we can provide the following treatment plan:
1 # sample processing plan
The appearance of sample 1 is green, and after inspection, the main metal content is nickel, while the other metal content is relatively low. After dissolving its solid, the pH value can be adjusted. Next, use low concentration P204 for impurity removal, extract Fe, Cu, Zn, Mn, Cr from the system, and extract a small amount of Pb. Subsequently, the raffinate was saponified using DY319 extractant, and the calcium and magnesium in it were washed away with water. Then, reverse extraction was carried out to obtain pure nickel ions.
2 # sample processing plan
The appearance of sample 2 is dark green, and after inspection, the main metal content is nickel, iron, and chromium. Firstly, the Fe and Cr ions in the feed liquid should be pre-treated to remove them. Then, P204 extractant can be used to remove impurities, remove impurities such as Ca, Mg, Cu, Zn, etc., and perform reverse extraction. Next, use DY319 extractant for saponification and extraction of nickel, wash the calcium and magnesium ions in it with water, and then perform reverse extraction to obtain nickel ions.
3 # Sample Processing Plan
The appearance of sample 3 is black, and upon inspection, its main metal content is copper, iron, and chromium. Pre treatment is also required to remove Fe and Cr ions from it. Next, use DY988N for copper extraction electrolysis. For the raffinate, it can be directly added to the 2 # sample treatment and processed together.
Due to the similar metal content in several samples, only the difference in content, it is recommended to mix them all together for systematic treatment in large-scale production. This can use a set of process flow to treat all electroplating sludge and avoid repeated investment.
The significance of electroplating sludge treatment
If electroplating sludge is not properly treated and discharged, it will cause serious pollution to the environment. By using different treatment methods based on different component contents, the beneficial components of electroplating sludge can be effectively separated, recycled, and reused, which not only saves resources but also reduces environmental pollution. Although the investment in this recycling facility is significant, it is still significant in the long run. Especially for countries in Southeast Asia, Africa, and South America, which used to have better natural environments, government funding is now needed to support early investment in this environmental protection industry, in order to protect people’s livelihoods and promote sustainable economic development. Invest early and benefit early.
If a customer needs technical guidance on design, construction, and operation in this area, we can provide a complete set of turnkey projects. Welcome to contact us to discuss cooperation.
Our major products of metal extractants and usage as below:
- P204 (D2EHPA or HDEHP) This is used for first step to remove impurity for laterite nickel ore.
- DY319 high efficiency nickel cobalt co-extraction extractant, can take out nickel and cobalt together from nickel laterite ore or Lithium battery electrolyte. This is second step for laterite nickel ore.
- DZ272 Nickel cobalt separation extractant, it can take cobalt out from nickel cobalt solution, then leave pure nickel. This is third step for laterite nickel ore.
- DY377 efficient nickel and diamond separation extractant.
- DY366 new advanced nickel cobalt extractant.
- DZ988N/DZ973N/DZ902 copper solvent extraction reagent.