Research On Preparation And Collecting Mechanisms Of Collectors Using At Room Temperature For Apatite

Phosphate ore is one kind of important strategic resources which has gained more attention of the world.China,which is known as the second-largest phosphide reserves country also faces the problem of rational phosphorus utilization for the phosphorite resources mainly distributing in southern of China meaning the consumption of phosphatic fertilizer in most parts of northern provinces are from southern.It is obviously unreasonable to transport phosphatic fertilizer from south-to-north based on the point of view of the country’s industrial rational distribution.The utilization of low grade phosphorite resources could relieve the pressure on south-to-north phosphorite transportation in China,which seriously affects the rapid development of Chinese economy.However,the requirement of higher pulp temperature to maintain the activity of fatty acid anionic collectors which have been widely applied in technological process of phosphate ores reverse flotation led to a great deal of energy consumption.Therefore,application of a new type of collector at room temperature could make a great significant difference.The flotation behaviors of-0.074mm+0.038mm size fractions apatite,quartz and feldspar single minerals were investigated through the pure minerals flotation experiments by using DCH-1、DCH-2、DCH-3、DCH-4 as collectors.According to the results of pure mineral experiment,eight collectors for actual ores were compound to investigate collecting behaviors in practical application.The pure minerals flotation experiments results shown that the apatite about 90%could be floated in pH range 5.0-10.0 using DCH-1,DCH-2 and DCH-3 as collectors,while almost all apatite could be floated in alkaline conditions.Results of single minerals flotation experiments shown that through optimum conditions of pulp pH 7.50,DCH-1 dosage 200.00 mg/L,and temperature 25 ℃,we can obtaine maximum apatite recovery of 93.58%.Through optimum conditions of pulp pH 9.00,DCH-2 dosage 75.0 mg/L,and temperature 20 ℃,we can obtaine maximum apatite recovery of 96.97%.Through optimum conditions of pulp pH 10.00,DCH-3 dosage 50.00 mg/L,and temperature 20 ℃,we can obtain maximum apatite recovery of 90.50%.Through optimum conditions of pulp pH 10.00,DCH-4 dosage 75.00 mg/L,and temperature 20 ℃,we can obtained maximum apatite recovery of 95.55%.The collecting ability of four collectors is DCH-2>DCH-4>DCH-1>DCH-3 in their respective optimal conditions.According to the result of pure mineral experiment,eight collectors of series CJX for actual ore were compound specific to investigate collecting behaviors in practical application.The components and characters of ore sample from tailing of baiquan plant were studied by using X-ray fluorescence(XRF),X-ray diffraction(XRD),chemical analyses,particle size distribution and P2O5 content of all grain levels.Results of chemical analysis shown the useful element was apatite,while the main impurity elements were silicon,and feldspar etc.Effects of grinding fineness,collector types and dosages,pulp pH,sodium silicate dosages,and flotation temperature on the flotation indexes of the actual ore samples were investigated.When conditions meet requirements that including grinding fineness-0.074 mm content 60%,pulp pH 10.00,sodium silicate dosage 200 g/t,collector DJX-6 dosage 400 g/t,pulp temperature 20 ℃,through the reverse flotation experiment of one roughing-three cleaning-one scavenging obtained the concentration P2O5 grade of 33.30%,and recovery of 93.36%.The experiment demonstrates that DJX-6 is an effective flotation collector on Baiquan phosphate ores.By means of modern detecting technology such as contact angle measurement,ζ-potential measurement and fourier transform infrared spectroscope,in conjunction of the results of single mineral flotation,and the basic theories of flotation solution chemistry,surface chemistry,and crystal chemistry etc,the absorption type between mineral and collector has been analyzed.The research shows that interaction between apatite surface and collectors DCH-1 DCH-2 DCH-3 and DCH-4 were chemical absorption,and hydrogen bond maybe also may be present;electrostatic adsorption may be exit in apatite surface and collector DCH-3.