硫酸添加顺序对方解石与磷灰石浮选分离的影响

doi:10.19964/j.issn.1006-4990.2024-0646

Abstract

Abstract:

The addition of sulfuric acid in the reverse flotation process of phosphate ore will change the material composition on the surface of calcite and generate CO₂bubbles，which will affect the adsorption of collector on the surface，and then affect the flotation index.In this paper，the effects of the addition order of sulfuric acid and sodium dodecyl sulfate（SDS） on the flotation separation of calcite and apatite were studied by means of pure mineral flotation test，contact angle test and scanning electron microscopy.The flotation tests of single minerals and mixed minerals showed that the addition of SDS before sulfuric acid had little effect on the flotation of apatite，but it could reduce the inhibitory effect of sulfuric acid on calcite，which was beneficial to the flotation separation of calcite and apatite.In addition，the action time of sulfuric acid under this addition method also had an effect on the flotation of calcite.The shorter the slurry adjustment time of sulfuric acid，the higher the flotation recovery of calcite.The separation effect of calcite and apatite by adding sulfuric acid firstly and then SDS was worse than that of the former.The mechanism study showed that the reason for the good flotation effect of adding SDS firstly and then adding sulfuric acid was that this method could effectively reduce the intensity of the reaction between calcite and acid，increase the retention of bubbles on the surface of calcite，reduce the formation of hydrophilic calcium sulfate on the surface of calcite，and enhance the binding effect of calcite on the generated CO₂bubbles.This study had certain theoretical significance for the flotation separation of calcite and apatite，and provided some guidance for the comprehensive utilization of phosphate rock resources.

Key words: calcite, apatite, flotation, sulfuric acid, CO₂ bubbles

CLC Number:

TQ132.32

WU Tuoxiu, DENG Rongdong, WU Siyuan, ZHU Qinqin, ZHAO Ruiqi. Effect of sulfuric acid addition sequence on flotation separation of calcite and apatite[J]. Inorganic Chemicals Industry, 2025, 57(12): 41-47.

Figures/Tables 11

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Effect of sulfuric acid addition sequence on flotation separation of calcite and apatite

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