Floatation separation technology of refractory lead-zinc sulphide ores

Abstract

The invention provides a floatation separation technology of refractory lead-zinc sulphide ores. The floatation separation technology comprises the steps that rough grinding is conducted on the lead-zinc sulphide ores, a pH regulator, a collector and a foaming agent are added, so that lead-zinc bulk floatation is conducted and lead-zinc bulk concentrates are obtained; and fine grinding is conducted on the lead-zinc bulk concentrates, a pH regulator, an electric potential regulator, an inhibitor and the like are added, so that lead ore floatation is conducted and lead concentrates are obtained,in the process, an electric potential of ore pulp is adjusted to be 210-350 mv by the electric potential regulator, and a pH value of the ore pulp is adjusted to be 9-11 by the pH regulator. A pH regulator, an activating agent and the like are added into lead ore floatation tailings, zinc ore floatation is conducted, and zinc concentrates and zinc ore floatation tailings are obtained. The lead-zinc floatation separation difficulty is reduced by adding the electric potential regulator, meanwhile waste water produced at various floatation stages is separated and independently recovered, the floatation separation technology is suitable for floatation separation of the lead concentrates and the zinc concentrates with high grades and recovery rates at low production cost from the refractory lead-zinc ores which are low in lead content and high in zinc content, and the application prospect is good.

Description

technical field [0001] The invention relates to the field of mineral separation, and in particular to a flotation separation process for refractory lead-zinc sulfide ores. Background technique [0002] Flotation is the most commonly used beneficiation method for lead-zinc sulfide ores. In the flotation process, because the natural floatability of lead minerals is better than that of zinc minerals, lead-zinc sulfide ores usually adopt the priority of "floating lead and suppressing zinc". Flotation process, that is: first use inhibitors to suppress zinc minerals and then float lead minerals, and then use activators to activate the suppressed zinc minerals and then recover zinc minerals. The beneficiation index of ordinary lead-zinc sulfide ore treated by this priority flotation process is better, and the grade and recovery rate of lead concentrate and zinc concentrate are higher. However, for the lead-zinc ore with low lead grade and high zinc grade, the refractory lead-zinc ...

AI Technical Summary

Problems solved by technology

Although adopting the conventional mixed flotation process to process lead-zinc ore can avoid the problem that zinc minerals must be suppressed and then activated, there are still the following problems: 1) activation is required in the process of obtaining lead-zinc mixed concentrate by mixed flotation. In order to ensure a high recovery rate of lead and zinc, but the zinc minerals are difficult to be inhibited by the inhibitor after being activated by the activator, which makes it difficult to separate the lead minerals from the zinc minerals in the lead-zinc mixed concentrate. During the separation process of lead and zinc A large number of zinc minerals enter the lead concentrate, which makes the zinc content in the lead concentrate exceed the standard, and the recovery rate of the zinc concentrate is low; 2) lead-zinc ore usually contains a large amount of iron minerals such as pyrite and pyrrhotite, These iron minerals will also enter the lead-zinc mixed concentrate during the mixed flotation process, so the lead concentrate and zinc concentrate that are separated from the lead-zinc mixed concentrate often have higher grades due to the higher content of iron minerals. lower

Therefore, the mixed flotation process is rarely used in the actual production process due to poor product quality and low recovery rate.

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