Solar Panel Recycling Machine for Silver Extraction
The ‘Solar Panel Recycling Machine (for Silver Extraction)’ is a complete set of equipment designed to recover silver resources from crushed and sorted silicon powder through processes such as nitric acid leaching, precipitation, filtration, and reduction. It is primarily used for the recycling of precious metals following the dismantling of photovoltaic modules.
Process Flow
The entire process begins with silicon powder recovered from photovoltaic panels. This is first fed into the leaching reaction system, where nitric acid is added to a corrosion-resistant reactor to convert the silver in the silicon powder into a silver nitrate solution. Solid-liquid separation is then carried out using a filter press to remove the silicon-based residue, yielding a relatively pure silver-containing solution.
In the second stage, a sodium chloride solution is added to cause the silver nitrate to form a silver chloride precipitate. This process relies on the coordinated operation of a stirred reaction vessel and a vacuum filtration system to enhance sedimentation and filtration efficiency. After multiple water washes, the solution proceeds to the alkali washing unit to remove impurities such as tin.
Finally, hydrazine hydrate is added to the reduction reactor to reduce the silver chloride to metallic silver powder, which is then collected via a vacuum filtration and drying system.
Measured data indicate that approximately 1 kilogram of silicon powder yields about 2.3072 grams of silver; the recovery efficiency is closely related to the source of the raw material.
Key Configuration
Core equipment includes corrosion-resistant reaction vessels, an automatic chemical dosing system, filter presses, vacuum filtration units, agitation tanks, and an exhaust gas treatment system. The design of the equipment prioritises resistance to acid corrosion and sealed operation to prevent the leakage of nitrogen oxides and ammonia compounds.
The control system typically employs centralised PLC control to automatically regulate chemical dosing ratios, reaction times, and temperatures. The filtration stage utilises a multi-stage filter press with vacuum-assisted filtration to minimise manual intervention and improve solid-liquid separation efficiency. The overall design favours continuous and modular configurations, facilitating expansion in line with production capacity.
System Design
The design of the entire production line emphasises closed-loop material handling and environmental protection, incorporating exhaust gas absorption towers and waste liquid neutralisation systems to ensure that acidic effluent meets discharge standards. The equipment layout follows a main process flow of ‘front-end crushing – wet leaching – precipitation and filtration – reduction and collection’, featuring a clear structure and ease of maintenance.
Furthermore, we provide support for process parameter optimisation, remote equipment diagnostics, and the replacement of wear-prone parts. We also adjust reagent ratios and reaction pathways according to the composition of different photovoltaic silicon powders to enhance stability and recovery rates. Should you be interested or have any requirements, please do not hesitate to contact us for further information!
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