Method for increasing recovery rates of lead and zinc during lead-zinc sulfide ore dressing-smelting joint application

Abstract

The invention discloses a method for increasing recovery rates of lead and zinc during lead-zinc sulfide ore dressing-smelting joint application. The method is implemented by the following steps of: performing floatation on lead-zinc sulfide ore to obtain lead concentrate, adding an appropriate amount of inhibitor in the flotation process to inhibit zinc and adding a collector and a foaming agent; and after floatation, selectively leaching zinc metal out of the lead concentrate by pressure acid leaching, performing liquid and solid separation on leached ore pulp and introducing metal zinc into solution so as to obtain lead-enriched slag. The floatation of zinc is restrained intentionally in the floatation process of the lead-zinc sulfide ore, so that the recovery rate of the lead concentrate is increased and the recovery rate of lead metal is over 90 percent; and the metal zinc is selectively leached out of the lead concentrate by pressure acid leaching and lead sulfide is insoluble in dilute sulphuric acid but leaves in a slag phase, so that the zinc leaching rate is over 98 percent in the pressure acid leaching process of the lead concentrate.

Description

technical field [0001] The invention belongs to the technical field of flotation and smelting, and in particular relates to a method for improving the recovery rate of lead and zinc through the combined application of separation and smelting of lead-zinc ore. Background technique [0002] For the treatment of materials such as "lead-zinc sulfide ore", the priority flotation process of floating lead and suppressing zinc is currently used to recover lead and zinc. The tailings after the lead metal are subjected to zinc metal mineral flotation, and more than 40% zinc concentrate can be obtained through flotation, which can be used for fluidized furnace and pressure leaching process. During the flotation of lead-zinc sulfide ores, according to the priority flotation process of lead metal, some lead and zinc with better floatability belong to the minerals of "joint organisms". "The lead-zinc ore is completely ground until the lead and zinc monomers are dissociated. Since this pa...

AI Technical Summary

Problems solved by technology

During the flotation of lead-zinc sulfide ores, according to the priority flotation process of lead metal, some lead and zinc with better floatability belong to the minerals of "joint organisms". "The lead-zinc ore is completely ground until the lead and zinc monomers are dissociated. Since this part of the "joint organism" minerals only accounts for a part, the grinding particle size is too fine to be conducive to the sorting operation of flotation. The requirement of flotation for the grinding particle size is Strict, so part of the zinc metal enters the lead concentrate during the flotation process along with the lead selection process, resulting in a high grade of zinc in the lead concentrate; and the lead concentrate is used as the main raw material for pyrometallurgy. High zinc metal content in lead concentrate will lead to high lead content in water slag produced from lead smelting slag, leading to a large loss of lead

However, the water slag contains a large amount of lead and zinc metals. Traditionally, fuming furnaces are used to recover lead and zinc, which leads to increased costs and environmental pollution.

It can be seen that the above-mentioned process has the disadvantages of long process, complicated operation, and high processing cost, especially the loss of lead caused by the metal zinc in the lead concentrate during the lead smelting process, which reduces the recovery rate of lead-zinc ore flotation zinc, and wastes resources.