Study On Combination Process Of Gravity-flotation For Low-grade Collophane

The refractory low-grade collophanite is rich in reserves in my country,but it is difficult to develop and use and the cost of beneficiation is high.Most of them are discarded without separation,causing serious waste of resources.Therefore,in this thesis,Falcon enhanced gravity separation and flotation combined separation methods are used to conduct an experimental study on the difficult-to-select low-grade colloidal phosphate rock,and to explore the optimal separation process conditions and process flow.Sorting provides new industrial production options.The experimental ore sample in this thesis comes from a low grade colloidal phosphate ore in Anhui.The P₂O₅ grade of the original ore is 14.84%.The ore belongs to the primary ore in the weathering type and the mixed phosphate and silicate phosphate ore in the industrial type.The mineral composition analysis of the original ore shows that apatite,dolomite and quartz account for a relatively large proportion,and other gangue minerals account for a relatively small proportion,and the target mineral apatite has a larger grain size than the gangue minerals dolomite and quartz.The inlay size.In the floatation test,the target mineral apatite is enriched in the density class of+2.96 g/cm³,and the P₂O₅ grade is as high as 29.93%.In theory,it can be sorted by re-selection first,and then combined with the flotation process to ensure that it is qualified.Product indicators.In the Falcon's enhanced gravity separation test,the effects of grinding fineness,rotation frequency,recoil water pressure,and feed speed on the separation effect were examined.Combined with the orthogonal optimization of Design-expert software,the optimal gravity separation condition was determined to be 78.56%-0.074 mm content,rotation frequency 44.50 Hz,backflushing water pressure 0.020 MPa,feed rate 22.04ml/s.The single factor test results show that the recoil water pressure factor has the greatest impact on the recovery rate of P₂O₅,and when the concentrate grade and recovery rate are used as the evaluation indicators,the P₂O₅ grade is as high as 21.35%,which is 6 percentage points higher than the original ore grade,and the recovery rate is72.28%.In the flotation test,the fine concentration of the re-concentration concentrate was determined by the grinding fineness test to determine the best sorting fineness suitable for colloidal phosphate flotation.The content of-0.074 mm accounted for86.54%,and the positive and negative were carried out at this fineness.Flotation test research.In the primary floatation,the sodium carbonate dosage is 5.5 kg/t,the water glass dosage is 1.0 kg/t,the collector ZF-1 dosage is 0.9 kg/t,and the primary floatation sodium carbonate dosage is 5.5 kg/t,water glass.With the dosage of 0.8 kg/t and the collector ZF-1 dosage of 0.5 kg/t,concentrate products with a grade of 26.58%and a recovery rate of 78.98%can be obtained.In the reverse flotation condition test,under the conditions of sulfuric acid dosage 5.0 kg/t,phosphoric acid dosage 6.0 kg/t,collector ZF-2 dosage 0.85 kg/t,the concentrate grade is as high as 30.75%,accounting for this level of recovery rate 73.50%.The results of the re-floating joint test show that the colloidal phosphate ore with a P₂O₅ grade of 14.84%in the original ore can be obtained through the re-floating combined sorting closed-circuit test to obtain a concentrate product with a P₂O₅ grade of 30.50%and a recovery rate of 64.88%.Product use requirements.The mechanism of the flotation agent was analyzed by infrared spectroscopy and contact angle measurement.Infrared results show that when the collector ZF-1 interacts with colloidal phosphate,physical adsorption occurs,and when the collector ZF-2interacts with dolomite,chemical adsorption occurs.The contact angle test results also confirmed the colloidal phosphate and dolomite The contact angle increases after interacting with the agent.The paper has 34 figures,30 tables,and 91 references.