Effect of synergistic action of dextrin and calcium ions on flotation separation of sphalerite and pyrite under weak alkaline conditions
The flotation separation of sphalerite and pyrite is mostly carried out under the condition of high alkali,but it will lead to a series of problems such as large dosage of reagents and serious corrosion of equipment.In order to solve these problems,dextrin,a clean and efficient organic inhibitor was used as a pyrite inhibitor.The mechanism of interaction between dextrin and minerals was clarified through mineral surface wettability test,adsorption capacity test and infrared spectrum detection,and the adsorption mode between calcium ion,dextrin and pyrite was analyzed and explained by flotation solution chemistry theory.The results show that under weak alkaline condition,dextrin acted alone,the inhibition effect on pyrite is not good,but after adding calcium ion,the inhibition effect of dextrin on pyrite is significantly enhanced.Under weak alkaline conditions,calcium ion can be strongly adsorbed on the surface of pyrite in the form of Ca(OH)+.At the same time,Ca(OH)+and dextrin also have strong adsorption capacity,which promotes the adsorption of dextrin on the surface of pyrite,thus strengths the inhibition of dextrin on pyrite,and realizes the flotation separation of sphalerite and pyrite.
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