Ore separation method for reverse flotation of smithsonite from lead-zinc sulphide flotation tailings

Abstract

The invention discloses an ore separation method for the reverse flotation of smithsonite from sulphide lead-zinc flotation tailings. According to the ore separation method, tailings obtained after the flotation of lead sulphide and zinc sulphide from high-garnet-type lead-zinc sulphide are fed. The ore separation method comprises the following steps: step 1, carrying out strong magnetic separation on the fed tailings by adopting a high-gradient pulsating strong magnetic separation machine, so as to obtain strong magnetic separation concentrate and strong magnetic separation tailings; step 2,carrying out flotation on the strong magnetic separation tailings by adopting a flotation machine, so as to obtain flotation concentrate and flotation tailings; and step 3, carrying out wet screeningand classification on the flotation concentrate to obtain materials in two different size fractions, and carrying out separation on the materials in two different size fractions again, so as to obtainconcentrates in two size fractions and tailings in two size fractions. By adoption of the ore separation method, the smithsonite can be separated from the fed tailings. Besides, the agent consumptionis low, the enrichment effect is good, and the recovery rate is relatively ideal.

Description

technical field [0001] The invention relates to the field of mineral processing technology, in particular to a mineral processing method for reverse flotation of smithsonite from lead-zinc sulfide flotation tailings. Background technique [0002] Smithsonite is a main mineral form of zinc oxide and belongs to carbonate minerals. At present, the beneficiation method for smithsonite in production is mainly the sulfuration-amine method. The essence of this process is to pre-sulfurize the surface of smithsonite by adding a large amount of sodium sulfide, and then add amines and high-grade xanthate to mix and collect. agent for direct flotation. [0003] There are two main disadvantages of the vulcanization-amine method: [0004] 1. Sensitive to ore slime, desliming is usually carried out before flotation, and the desliming operation will cause a large loss of zinc metal in the mud product, making the final recovery rate lower than 50%; 2. Sodium sulfide consumed by pre-sulfuri...

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Problems solved by technology

[0004] 1. Sensitive to ore slime, desliming is usually carried out before flotation, and the desliming operation will cause a large loss of zinc metal in the mud product, making the final recovery rate lower than 50%; 2. Sodium sulfide consumed by pre-sulfurization Large amount (generally 10-50kg / ton* for ore), long pre-sulfurization time (generally 10-20 minutes), because sodium sulfide itself is also a kind of defoamer, the increase of sodium sulfide dosage will lead to foaming In order to ensure the stability of the flotation foam, the amount of amine collectors with high performance needs to be increased accordingly, and the excessive amount of collectors will lead to serious entrainment and affect the concentrate grade. In actual production, in order to ensure the vulcanization effect The amount of sodium continues to increase, in order to ensure foam stability, the amount of collectors also increases accordingly, leading to a vicious circle, resulting in a large amount of production agents and low concentrate grades

[0005] Since the smithsonite associated in sulfide lead-zinc ore is usually of lower grade (<3%) and is more easily ground and brittle than lead-zinc sulfide ore, resulting in high mud content in the raw material, the conventional sulfide-amine flotation method not only The consumption of chemicals is large, and the enrichment effect and recovery rate are not ideal

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