Research And Application Of Copper And Arsenic Separation Inhibitor

Based on the research background of the high arsenic content in copper concentrate products from the flotation of primary copper-tin polymetallic symbiotic ore in a processing plant in Yunnan,this paper has identified through the process mineralogy of the raw ore and copper concentrate that the arsenic-containing substances in the copper concentrate are mainly arsenic.Occurs in the form of arsenopyrite,arsenopyrite and chalcopyrite are inlaid complexly,and a large number of arsenic-containing minerals enter the copper concentrate in the form of conjoined or arsenopyrite,resulting in high arsenic content in the concentrate.Therefore,how to effectively separate arsenopyrite and chalcopyrite by flotation is an important issue for flotation of mixed copper ore to reduce arsenic.In view of the above problems,this paper explores the flotation of chalcopyrite and arsenopyrite through pure mineral flotation test of chalcopyrite and arsenopyrite,artificial mixed ore test,X-ray photoelectron spectroscopy analysis,potentiodynamic test and MS calculation to explore the mechanism of chalcopyrite and arsenopyrite flotation separation.The effects of Cu²⁺,Fe³⁺,and Ca²⁺on the flotation separation of chalcopyrite and arsenopyrite were studied;new combined inhibitors were explored with CMC,CTP,and CSL as the main inhibitors,and a new set of high-efficiency and environmental protection for this type of mineral was formed to solve the problem of high arsenic content in copper concentrate.The research conclusions are as follows:（1）In the system with OL-ZN as the collector,when p H=9,Cu²⁺has a strong activation effect on arsenopyrite,and hardly affects the floatability of chalcopyrite;Fe³⁺has weak inhibitory effect on arsenopyrite and chalcopyrite;the inhibitory effect of Ca²⁺on arsenopyrite is more obvious than that of Fe³⁺,and it has almost no inhibitory effect on chalcopyrite.In conclusion,in a single ion system,Ca²⁺can promote the flotation separation of arsenopyrite and chalcopyrite.（2）Through the study on the separation of chalcopyrite and arsenopyrite with three organic inhibitors CMC,CTP and CSL,it is found that the three inhibitors have inhibitory effects on arsenopyrite,and CSL has the best inhibitory effect.The experimental results of artificial mixed ore show that under the action of Ca²⁺,the combined inhibitor OL-3C formed with CSL as one of the components has a higher grade of copper concentrate than the single inhibitor CSL and Ca²⁺+CTP with higher recovery and separation efficiency.（3）X-ray photoelectron spectroscopy analysis,potentiodynamic test and MS calculation results show that CSL produces chemical adsorption on the surface of arsenopyrite,the-SO₃^2-contained in CSL interacts with the Fe atomic sites on the surface of arsenopyrite to form Fe-O bonds and adsorbs on the surface of arsenopyrite to inhibit the surface hydrophilicity;Ca²⁺forms hydroxy calcium to make the surface of arsenopyrite hydrophilic,which inhibits the emergence of arsenopyrite.（3）Daqing Mine uses collector OL-ZN,foaming agent MIBC,arsenic inhibitor OL-3C,vulcanizing agent Na₂S and adjusting agent Ca O as a new chemical system with a selected independent circulation process,which the copper concentrate with Cu grade of 19.32%and arsenic content of 3.26%can be obtained,and the Cu recovery rate can reach 47.99%.Gaofeng mountain Mine uses collector OL-ZN,foaming agent MIBC,arsenic inhibitor OL-3C and regulator Ca O as a new chemical system to obtain copper concentrate with Cu grade of 20.12%,arsenic grade of 1.16%,arsenic grade decreased by 1.06%.Both kinds of minerals have achieved the purpose of reducing arsenic.