Differential flotation process for sphalerite

Abstract

The invention discloses a differential flotation process for sphalerite, and belongs to the technical field of lead-zinc ore flotation. The method comprises the following steps that original roughing is divided into two sections (first roughing and second roughing), the first roughing is that sphalerite which is good in floatability, less in entrainment and high in grade enters second zinc refining operation, the second roughing is that sphalerite which is poor in floatability and more in entrainment enters the first zinc refining operation, middling of the first zinc refining is reground, and after the dissociation degree is increased, the second zinc roughing is returned. Aiming at the condition that the grade of the zinc concentrate is influenced by a large amount of light minerals such as dolomite and calcite contained in the micro-fine particle sulfur-oxygen mixed complex continuous lead-zinc ore, a process different from a traditional ore dressing process is adopted, ore concentrate inclusion can be effectively reduced, the grade of the zinc concentrate is improved, the process circulation amount is reduced, the equipment load is reduced, and a better flotation index is obtained.

Description

technical field [0001] The invention relates to the technical field of complex sulfur-oxygen mixed lead-zinc ore flotation, in particular to a sphalerite fractional-speed flotation process. Background technique [0002] In the flotation process of lead-zinc ore, the refractory lead-zinc ore containing light and easy-to-float gangue has a high content of secondary slime and a large specific surface area of ​​the slime. In the beneficiation process, there are often prominent problems such as serious floating mud inclusions, large medium ore circulation, poor flotation stability, and low grade zinc concentrate. [0003] At present, for the beneficiation process of fine-grained lead-zinc ores containing high shale, in order to eliminate the interference of light and easy-to-pumice gangue such as dolomite and calcite, the following two processing methods are often used: [0004] (1) Use macromolecular inhibitors such as gull gum, dextrin to suppress the buoyancy of this type of ...

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Problems solved by technology

[0004] (1) Use macromolecule inhibitors such as gull gum and dextrin to suppress the buoyancy of this type of gangue, and reduce the interference to zinc flotation (such as Li Guodong's "Technology and Process for Separating Lead-Zinc Mixed Concentrates by Suppressing Lead and Leaving Zinc" Mechanism Research"; such as the beneficiation method of high-sulfur lead-zinc ore disclosed in Chinese patent CN202010620631.9), but the cost of the reagent is high, and the residue of the reagent enters the beneficiation wastewater, and the reuse of the beneficiation wastewater is easy to interfere with the lead flotation;

[0005] (2) Change the process structure, such as desliming in advance, releasing part of the middle ore with high muddy quality and transporting it to the tailings (Yu Zhenghua's "Selective Flocculation Flotation Method to Treat a Low-grade Sulfur-Oxygen Mixed Lead-Zinc Ore Mineral Processing Experimental Research "), but this method can easily lead to a large amount of metal loss in the tailings, which is not conducive to the improvement of the overall economic benefits

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