Flocculation Sedimentation Test of Ultrafine Tailings Based on Turbidity of Supernatant Liquid
Received date: 2022-08-03
Revised date: 2022-10-06
Online published: 2023-01-06
A set of measuring cylinders is generally used to carry out sedimentation test in the dense dewatering of the whole tailings，and the sedimentation velocity and sedimentation underflow concentration of the tailings are used as the basis of flocculants optimization.However，the dense dewatering of ultra-fine tailings has the characteristics of difficult settling and slow settling speed.The turbidity of the supernatant is an important criterion for the selection of flocculants.The currently widely used experimental methods for dense dehydration of full tailings are difficult to meet the dense dewatering of ultra-fine tailingsIn order to solve the problem that the turbidity of supernatant liquid is not considered in the existing dense sedimentation test of ultrafine tailings，a flocculant optimization method for dense sedimentation of ultrafine tailings was proposed.Taking the ultra-fine tailings of a fluorite mine as the research object，and taking the concentration of prefabricated tailings slurry，the type of flocculant，and the amount of flocculant as the dependent variables，a comprehensive test was carried out，and the mixing of tailings slurry and flocculant was carried out in a six-stage mixer.Mixing，reacting and precipitation，using a turbidimeter to test the turbidity of the supernatant liquid at different settling times，and comprehensively considering the settling speed and the cost of the flocculant，to obtain the optimal type and dosage of flocculant under different concentrations of prefabricated tailings.The experimental results show that：For the flocculation and sedimentation of ultra-fine tailings with both bridging and protective effects of flocculants，when the concentrations of prefabricated tailings are 5%，8%，11% and 14%，respectively，the optimum flocculant types are 18 million，16 million，16 million and 12 million anionic polyacrylamide，and the optimal flocculant dosage is 15，25，30 and 30 g/t respectively.Among them，the turbidity of the tailings slurry with the concentration of 8%，11% and 14% change obviously after using the optimal molecular weight and dosage of the flocculant，which could be reduced by more than 10NTU，but the difference is not large.Considering the flocculant price，we recommend the mine use 14% as the feed concentration of the mine’s deep cone thickener.The experimental results provide the basis for the dense settlement engineering parameters of the ultra-fine tailings in this mine，indicating that the ultra-fine tailings dense dewatering experimental method and flocculant selection method proposed in this paper have good application prospects.
Qing YANG , Shijiao YANG , Ranyue ZHANG . Flocculation Sedimentation Test of Ultrafine Tailings Based on Turbidity of Supernatant Liquid[J]. Gold Science and Technology, 2022 , 30(6) : 948 -957 . DOI: 10.11872/j.issn.1005-2518.2022.06.098
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