Synthesis And Flotation Application Of Oleic Acid Modified Colloidal Phosphate Collector

Phosphorus is an essential element for the growth of crops,so phosphate fertilizer plays an important role in increasing agricultural production.In recent years,the rapid development of agriculture has stimulated the demand for phosphate fertilizer,and the main source of phosphate fertilizer is phosphate rock.Since most of phosphate rock in our country is of medium and low grade and its components are complex and difficult to be separated,the sustainable development and utilization of phosphate rock is directly related to national food security and human survival and development.However,as a common collector of collophanite flotation,fatty acids have some disadvantages,such as poor selectivity and large dosage of reagents,which make it difficult to develop and utilize collophanite efficiently.Previous research work has shown that the modification and combination of fatty acid collectors can increase the flotation performance and sorting of the agent,and optimize and improve the flotation process,which is beneficial to the development and utilization of the phosphate rock.In this paper,oleic acid was used as raw material to prepare a new collector by means of modification and combination of reagent.Through flotation of silica-calcareous collophanite in Yichang area of Hubei Province,the flotation performance of the collector was verified,and the performance of the collector and the mechanism of mineral action were studied.The results were as follows:1)The oleic acid was used as a raw material to obtain a fatty acid type collector ZQ-1containing a hydroxyl group and a phosphine group,and then combined with a polyhydroxy fatty acid collector ZQ-2 independently developed by the laboratory according to a certain mass ratio.It was the compound oleic acid modified collector ZQ-C developed.The synthetic collector ZQ-1 was preliminarily evaluated by the epoxy value and the flotation recovery index of single mineral apatite.The material ratio,synthesis temperature and synthesis time of the collector synthesis process were investigated to determine the capture.The method of synthesis was carried out,and the presence of a hydroxyl group,a phosphonic acid group and a carboxylate group was determined by infrared spectrum analysis.2)The technological mineralogy of the collophanite was studied by means of scanning electron microscopy,EDS energy dispersive spectrometer,X-ray diffraction analysis and X-ray fluorescence spectrometry.The results showed that the collophanite belongs to middle-grade silica-calcareous phosphate rock with complex composition.The useful minerals were mainly apatite,gangue minerals were mainly calcite quartz,and the mineral size was about 10μm.3)The flotation performance of the collector was verified by flotation of the silicous calcium phosphate rock in Yichang,Hubei Province.The single positive flotation process and the positive flotation coupled chemical demagnesization process were carried out respectively.Firstly,a single positive flotation process was adopted to flotation,and the optimum reagent system for rough flotation was determined,and the closed-circuit test procedure of"one roughing,one cleaning and one sweeping"could obtain a good flotation indicators of the P2O5 grade was 29.72%and the recovery rate was 92.23%.In addition,the flotation process was carried out by positive flotation coupled chemical demagnetization process,and the optimum technological conditions for chemical demagnetization were determined.The good index of the concentrate P2O5 grade was29.45%,the recovery rate was 71.81%,and the Mg O grade was 0.30%.The experimental results showed that the new single positive flotation coupled chemical demagnetization process has obtained a simpler process,lower grade of concentrate Mg O but less P2O5recovery.4)The foam properties of agents and the mechanism of action of minerals and agents were studied by surface tension,foam properties,contact angle,Zeta potential,single mineral microflotation,IR and other test methods.The results showed that the critical colloid concentration of the agent was 10g·L^-1;when the concentration of 20g·L^-1 and the solution p H value was 9.13,the half-life of the foam of agent was 638s,the foam was the most stable,the contact angle was 92.5 degrees,and the mineral surface hydrophobicity was the strongest;and the separation of apatite and dolomite was more advantageous when the p H value was between 4 and 6,the separation of apatite and quartz was more advantageous when the p H value of solution was greater than 9;the Zeta test after the action of infrared test and collector showed that the reagent and pure ore were better.Infrared and Zeta potential tests showed that the agent was adsorbed with pure minerals.The subject synthesizes the collector of the target designed and the flotation performance of the composite collector was excellent,and the foam was stable.The flotation index could be obtained by flotation application of the silicic calcium phosphate rock in Yichang,Hubei,and a new single positive flotation coupled chemical magnesium removal process was used to obtain a better index.