Study On The Flotation Behavior And Separation Of Sulfur-arsenic Mineral

Along with the enlargement of development and utilization of resource degree, the mineral resources presents the characteristics of poor, thin, mixed and difficulty to classify, and total import of sulfur resources further enlarges. The security of sulfur resources not only relates the economic benefit of the sulfuric acid business, but also the development of sulfuric acid industry and sustainable development of other related industrial.The arsenic intermixes in the sulfur ore concentrate as inimical impurity serious, influencing following work of metallurgy and producing sour, and bringing many environmental pollution. Thus the electrochemistry fundamental research to the arsenopyrite and the pyrite and the organic inhibitor combining electric potential regulation flotation process technology, may develop the flotation separation theory and process of sulfide minerals, enhance comprehensive utilization of mineral resources, reduce mineral processing cost and raise economic efficiency, which has the important theory significance and the practical significance.This article chooses the tailings of zinc flotation of polymetallic sulphide ore as object of study, investigates the flotation behavior of pyrite, pyrrhotite and arsenopyrite under xanthate system. The results indicated: under the condition of acidity and the neutral pH, xanthate has well collecting to the sulfur-arsenic mineral, but under the condition of alkalinity, the flotation performance sulfur-arsenic mineral becomes very bad, even cannot float; In the entire range of pulp pH, the flotation performance of sulfur-arsenic mineral is close, and it is difficult to separate. The humic acid sodium can inhibit arsenopyrite well, under the condition of certain pulp pH and the humic acid sodium amount, the separation of arsenopyrite and pyrite may achieve, but the separation of arsenopyrite and the pyrrhotite is difficult.Using electrochemistry test method to separate three kinds of sulfur-arsenic mineral electrode surface oxidizing reaction and the oxidation product, tallies approximately with the Eh-pH chart. In the collector system, butyl xanthate adsorbs to the surface of the three kinds of sulfur-arsenic mineral mainly as dixanthogen, causing hydrophobic. The results indicate:the thermodynamics stability of pyrite and the arsenopyrite is similar, thus it is very difficultl to separate sulfur from arsenic through thermodynamics condition (Eh, pH).Studing on the infrared spectrum after the interaction of organic inhibitor humic acid sodium and sulfur-arsenic mineral, It was found that the action of humic acid sodium and the sulfur-arsenic mineral is primarily chemical action, namely the humic acid sodium adsorbs to mineral surface through the chelation with iron ion on sulfur-arsenic mineral surface; After adding butyl xanthate as dixanthogen form competitively adsorbs to pytrite surface with humic acid sodium, but there no any dixanthogen on the surface of pyrrhotite, arsenopyrite.This article chooses two kinds of tailings of zinc flotation from Mengzi Bainiu Factory and Guangxi Dachang ore as object of sulfur-arsenic separation study, uses humic acid sodium combining the magnetic separation - flotation process, and obtains good beneficiation index.