Reasons for the low total copper content in the molten copper

Reply to 1# mjackson: Another issue is that copper was not added to the system in a timely manner.

Adding ammonia to the copper melt, water in the wash tower, liquid in the copper tower, and changes in the level of the regeneration liquid are also among the causes.

The total copper level has decreased. There are several reasons for this decrease: 1. The H2S content in the feed gas used in the copper washing tower is too high. When the H2S content in the feed gas to the copper washing tower is too high, the low-valent copper ions in the copper melt react with hydrogen sulfide to form black copper sulfide precipitates, resulting in a decrease in the total copper content in the copper-ammonia solution. 2. The composition of the copper melt is abnormal, resulting in the formation of precipitates. When the copper ratio control is too high, metallic copper will precipitate, forming a metallic copper deposit. When free ammonia is insufficient, brownish-yellow copper acetate precipitates and metallic copper precipitates tend to form. When the amount of acetic acid in the copper melt is insufficient, copper ammonium carbonate tends to form, which reduces the total copper content in the melt. 3. The copper melt is diluted, resulting in a decrease in total copper content. ○1. There is an internal leak in the regenerator and the copper melt heater, allowing steam to enter the copper melt and dilute it. ○Condensate leaks into the copper melt from the steam nozzles of the 2nd reflux tower. ○3. The five-stage oil-water separator of the compressor does not perform well, allowing oil and water to enter the copper melt. Or carbonization can cause numerous incidents involving water, which is then introduced into the copper melt. ○4 Excessive water supply to the system. Methods to address the decrease in total copper: 1. Improve desulfurization efficiency and reduce the H2S content in the raw gas fed to the copper washing tower. 2. Strictly control the copper ratio as well as the levels of ammonia and acid in accordance with the process specifications. 3. During operation, regularly check to prevent steam or water from inside or outside the system from leaking into the copper melt. 4. Supplement metallic copper in a timely manner according to the changes in the total copper content in the copper-ammonia solution. 5. The system should be replenished with water in appropriate amounts, and proper records should be kept