Arsenic treatment manufacturers: We have all seen that the soot generated by the non-ferrous metallurgical industry now mainly comes from the smelting, roasting or slag fumigation and recovery process of ores in the extraction of heavy metals such as copper, lead, zinc, cobalt and tin. Of course, in this, copper dust contains valuable metals such as copper, lead and zinc, and its chemical composition is complex. The following is the technical treatment method for arsenic-containing fume and dust?

　　Arsenic treatment manufacturers: arsenic-containing soot directly back to the copper smelting system, not only will greatly increase the content of impurities entering the furnace raw materials, deteriorate the furnace conditions, reduce the furnace's processing capacity, and as you can see it is the accumulation of arsenic, bismuth, zinc and other impurities in the cycle will directly affect the quality of electric copper. In addition, it will affect the service life of the acid catalyst, thus reducing the SO2 conversion rate and the quality of sulfuric acid products.

　　Arsenic treatment manufacturers: Therefore, it is necessary to treat the copper soot generated from copper smelting systems to comprehensively recover valuable metals. At present, we found that most of the domestic smelters use the combined process of "wet smoke and fire" to treat the smelting dust, i.e., first leaching out the valuable elements such as copper and zinc from the dust with water or dilute sulfuric acid, and then recycling them separately; the leaching residue (mainly containing lead) is returned to the smelting system as an ingredient, and the lead and other metals are recovered by pyrometallurgy. Recovery.

　　Arsenic treatment manufacturers: the process flow of arsenic-containing soot is as follows: fuming, acid leaching, copper precipitation, iron removal, evaporation and crystallization of zinc precipitation, zinc sulfate heptahydrate, in such a way that the leaching residue obtained can go well sent to the pyrometallurgical process to recover lead, sponge copper sent to the copper system, iron slag heap, zinc sulfate heptahydrate for sale.

　　Arsenic treatment manufacturers: However, we say for you that there are still some problems with arsenic-containing soot: in the wet process of lead and copper smelting dust, the leaching rate is not high, only 20-30%, and most of the rest stays in the leaching residue, which is also returned to the pyrometallurgical process at this time mainly through the batching system. The cycle will make the dust content as high as 40-45% and it will then jeopardize the normal production; as some forms of copper are insoluble in acid and not easily leached, they stay in the leaching slag, which reduces the copper recovery to 60-65%. Therefore, the existing fume treatment technology needs further improvement.

　　Arsenic treatment manufacturers: arsenic-containing soot The system can achieve efficient recovery of valuable metals such as zinc, lead and copper from soot and realize resource utilization of soot. The technical method is to first wash the soot, and at least 15% of the copper in the soot can be dissolved in water, and then mix the filter residue, additives, reducing agents and binders obtained from the water washing, and perform forming and drying processes in turn, and provide the resulting dried pellets to the rotary bottom furnace. In a rotary hearth, retaining walls divide the annular chamber into a distribution zone, a preheating zone, a make-up air booster zone, a medium temperature zone, a high temperature zone and an emission zone. If the soot is well controlled, the quality of the flue gas containing dioxide and lead-zinc can be further guaranteed. In the medium and high temperature zones (up to 1000°C), the various forms of copper contained in the dry pellets can be reduced to elemental copper in the presence of additives and reducing agents.

　　Arsenic treatment manufacturers: The above is about "technical treatment methods for arsenic-containing soot". If you still don't know anything, please call us. Today's knowledge is here, I hope it can bring you help. The next issue will bring more information about it.