Resource utilization method for Zn, Pb and Ag-containing smelting slag

Abstract

The invention discloses a resource utilization method for Zn, Pb and Ag-containing smelting slag, and belongs to the technical field of secondary resource recycling of nonferrous metallurgy. According to the resource utilization method, high-grade PbO and ZnO smoke dust and Ag-enriched roasted slag are obtained by detecting the phase occurrence mode of the Zn, Pb and Ag-containing smelting slag ( containing 3 to 7 percent of Pb, 6 to 12 percent of Zn, 120 to 210 g / t of Ag, 9 to 15 percent of S, 8 to 12 percent of Fe and 12 to 20 percent of SiO2) and changing the states of part valuable metals in the Zn, Pb and Ag-containing smelting slag by utilizing reducing roasting; the smoke dust enters a Pb and Zn smelting system; concentrated Ag ore and tailings are obtained by floating the Ag from the roasted slag; the concentrated Ag ore is directly sold as a product; and the tailings can be externally sold to a cement plant. The overall process does not produce waste slag and wastewater, and is environment-friendly. The method disclosed by the invention is simple in flow; and the direct recovery rates of the Pb, the Zn and the Ag in the smelting slag respectively reach over 98 percent, 95 percent and 96 percent, so that the resource utilization of the valuable metals in the Zn, Pb and Ag-containing smelting slag is realized.

Description

Technical field [0001] The invention belongs to the technical field of secondary resource recovery of non-ferrous metallurgy, in particular to a resource utilization method of lead-zinc-silver smelting slag. Background technique [0002] The smelting slag containing lead, zinc and silver can be smelting slag produced in the process of hydrometallurgical zinc smelting, or it can be process slag containing lead, zinc and silver produced by non-ferrous metal smelting systems such as copper and lead. Under normal circumstances, a hydro-zinc smelting plant with an annual production capacity of 10,000 tons of electro-zinc can produce about 5,000 tons of smelting slag containing lead, zinc and silver each year. my country is a large zinc smelting country, with its zinc output ranking first in the world for many years, and 80% of zinc smelting is hydrometallurgical smelting. Therefore, my country produces a huge amount of lead-zinc-silver smelting slag each year. The long-term stacking ...

AI Technical Summary

Problems solved by technology

Traditional fire treatment methods (such as rotary kiln, fuming furnace volatilization treatment, etc.) have high energy consumption and heavy environmental pollution. With the intensification of energy shortage and the improvement of environmental protection requirements, the application of such methods will become less and less

In the wet treatment method, due to the relatively low content of lead and silver in the smelting slag containing lead, zinc and silver, it is still difficult to directly recover lead and silver. In the method, the salts and alum in the slag are not completely decomposed, and the primary leaching rate of zinc and iron is often not high, so the leaching rate of metals still needs to be improved.

The efficient separation of zinc and iron in the leaching solution and the effective utilization of iron resources are major problems faced by wet methods. There are still many deficiencies in current iron removal methods, and the iron-containing slag produced after iron removal is difficult to effectively use. Therefore, wet treatment Methods There are deficiencies in the comprehensive recovery of smelting slag containing lead, zinc and silver. Many methods only recover one or several elements in the smelting slag containing lead, zinc and silver, and the rest will continue to be piled up as waste. To make full use of these resources, but not to achieve substantial emission reduction goals