How to improve the copper recovery rate when restarting operations after a major overhaul of the copper washing unit

When considering the copper recovery ratio, plant operators should pay attention to the following points: 1. Appropriately increase the carbon monoxide content in the feed gas, while reducing the carbon dioxide and oxygen contents. 2. Slightly reduce the amount of ammonia added to the system in order to lower the free ammonia content in the copper melt. 3. Increase the regeneration pressure appropriately. 4. Control the reduction temperature well, by slightly lowering the temperatures in the regenerator and the return column. 5. Try to extend the reduction time (by changing the flow pattern of the copper melt and increasing the time it stays in the regenerator)

How to increase the copper ratio after major repairs? 1. First of all, it should be considered that the reason for the low copper ratio after major repairs is the prolonged oxidation of the copper melt, as a result of which the copper in the melt at the monovalent state is excessively oxidized to divalent copper! 2. Typically, during major overhauls, the copper washing process involves draining the system, after which a small amount of deionized water or soft water is added for rinsing in order to recover the copper solution; this results in an increase in the total volume of liquid, a decrease in the total amount of copper, and a reduction in the copper ratio! Once the reasons are clear, different solutions are formulated based on the extent of reduction in the aforementioned indicators ； Mainly, based on the indicators, the difficulty levels of the plans vary, and their impact on production also differs! Those who are interested or companies facing similar issues can discuss this in detail. Email: sdjn666666@126.com