Determination Of Residual Flocculant In Ore Dressing And Its Effect On Magnetic Separation

The tailings of the Jinshandian concentrator are fine and difficult to settle.The concentrator adds excessive flocculant to the tailings to help the tailings settle and concentrate.The excess flocculant goes into the next beneficiation process with the ore returning water.The choice has an impact.In this paper,a variety of testing techniques were used to investigate the residual conditions of flocculants in the recirculating water and the factors affecting the flocculant residue and the changes of concentrate iron grade and iron recovery rate after adding flocculant,and studied the flocculant and magnetic field strength.The influence of slurry concentration and fineness of mineral particles on the iron grade and iron recovery rate after magnetic separation was analyzed.The main research contents and innovations of the thesis are as follows:Determination of the residual amount of flocculant in the backwater and its influencing factors: At present,several methods for detecting polyacrylamide concentration have higher requirements for lower detection limit,and it is not possible to measure the concentration of polyacrylamide in the slurry.The test is based on polyacrylamide.The flocculation performance and the flocculation curve of polyacrylamide on the tailings are used to infer the relative residual amount of polyacrylamide in the recycled water.The concentration of the slurry is 10%~20%,the return time is 0~48h,and the flocculant concentration is 25~75mg/l and mineral particles-0.074 mm accounted for 92.12%~97.96%,the test showed that the test temperature had little effect on it.The concentration of slurry,the time of returning water,the concentration of flocculant,and the fineness of mineral particles were reduced.Small,the residual amount of flocculant was determined to be in the range of3~11 g/t by orthogonal test and the worst test group.Effect of adding flocculant on magnetic separation: After adding flocculant,the grade of concentrate iron decreased from 63.8% to 62.51%,and the iron recovery rate gradually increased from 74.35% to 75.88%.Through single factor experiment,it isfound that the effect of flocculant on the magnetic separation has synergistic effect;the flocculant has a positive effect on the magnetic field on the magnetic separation;the flocculant has a slight effect on the influence of mineral particle fineness on the iron grade.The effect of flocculant on the fineness of mineral particles on iron recovery is relatively independent;the dosage of flocculant is 0~11g/t,the concentration of pulp is10%~30%,the proportion of-0.074 mm is 92.12%~97.96%,the magnetic field strength At 0.06~0.18 T,the orthogonal test shows that the influence on the grade of concentrate iron is from mineral particle fineness,magnetic field strength,pulp concentration and flocculant dosage.The influence of iron recovery rate from large to small is magnetic field strength,flocculant dosage,pulp concentration,and mineral particle fineness.The effect of the flocculant on the magnetic separation can be reduced by reducing the ore concentration of the magnetic separation.The microscopic morphology of the original ore sample after flocculation was analyzed by optical microscopy.After adding the flocculant,the floc was obvious and the floc length could exceed 0.4 mm with the increase of flocculant dosage.Zeta potential measurement showed that the zero point of Zeta potential was 5.9.After the addition of flocculant,the adsorption of flocculant caused the mineral zeta potential of mineral surface to decrease significantly.With the increase of flocculant dosage,the absolute value of zeta potential on mineral surface Gradually increase,the increase trend slows down,and the system becomes more and more dispersed.