Feasibility Study On Industrial Application Of New Type Micellar Agent Material For Low Cost Fine Grain Tailings Collection In A Mine

The failure to remove the mine tailings ponds has always been the primary issue that restricts domestic and foreign mines from expanding production scale and achieving sustainable mining.At present,the tailings treatment methods that are actually used in industrial production at domestic and foreign are mainly flocculants combined with thickeners,disc filters and other machinery to achieve the separation of tailings water and tailings,to achieve the reuse of water resources and the tailings particles to fill and reuse Mode.The low efficiency of tailings separation is the main technical problems faced by domestic and foreign mines.Taking a lead-zinc mine in southern China as an example,in the past 3 years?2017?2019?,the tailings output of the mine concentrator averaged 40%of the original ore,and coarse-grained tailings?that is graded tailings?were recovered The average rate is45%,and about 55%of fine-grained tailings?tail tailings particles below 19?m?in the tailings are discharged into the tailings pond and about 2 million tons of unusable tailings are generated in a year^[1].Facing the environmental protection task of the nationwide tailings ponds remove,the current tailings recovery rate is hardly meeting the requirements.Therefore,from the perspective of improving the separation efficiency of water and tailings,combined with the research group's early research and development of micelle materials and the production conditions of the mine,the feasibility study on the industrial application of new low-cost fine-grained tailings for the collection of new micelle materials has been carried out.This article is based on the key scientific research projects of industrial application research of new micelle materials for the collection of fine-grained tailings from a lead-zinc mine in southern China,and the new micelles developed by the research team in the early stage which is based on the coagulant polyacrylamide and polyaluminum ferric chloride,through the analysis of the physical and chemical properties of the tailings and laboratory feasibility experiments,the possibility and feasibility of replacing the flocculant in a mine are theoretically verified.Afterwards,the optimal adjustable use concentration of the micelle agent in industrial production was 0.1g/L?0.1%?,and the adjustable use amount was 15ml/L.And from the two dimensions of precipitation effect?precipitation speed,precipitation dry weight?and clean water quality?COD?p H?ORP?,the actual application effect of micelle agent in industrial production environment was studied.In production,it can effectively improve the setting rate of fine-grained tailings,and at the same time can provide a large amount of available clean water for the mine,which is suitable for the daily production of the mine^[2].Finally,the economic dividend brought by the application of micelles is studied by analyzing the cost of materials,the cost savings of clean water reuse,and the operating costs of tailings ponds.The main research contents and conclusions of this article are as follows:?1?In the early stage of the experiment,by using the X-ray diffractometer?XRD?and X-ray fluorescence spectrometer?XRF?to analyze the chemical properties of the 30m thickener tailings slurry and the laser particle size analyzer was introduced to the physical properties of the 30m thickener tailings.It is turn out that the three tailings slurry mainly contain nitrate ions NO^2-,NO^3-and sulfate ions SO₄^2-.The overall slurry is weakly alkaline and the lead-zinc content is less than 1%.Through the setting analysis?water sieve?experiment,the particle size distribution of the feed slurry of 30m thickener,03 tail sand and full tail sand below 19?m was further determined.It is clear that the proportion of particles below 19?m in the 30m thickener pulp is greater than 90%.A special micelle agent for mine tailings precipitation is proposed.Its formula combination is:main coagulant?hydroxyaluminum?53%?coagulant 1?polyacrylamide?27%?coagulant 2?polyaluminum ferric chloride?15%?compound additive5%.Combining the analysis results of the physicochemical properties of micelles,it is concluded that the physical and chemical properties of the three types of tailings are suitable to the use of micelles?flocculants?.The micelle has the possibility to be applied to tailings capture.?2?Carrying out the feasibility experiment of the micelle agent of the research group to treat the 30m thick machine tailings feed slurry.Confirm that the optimal concentration of micelle in the indoor test environment is 0.1g/L?0.1%?.At the same time,it has been confirmed that the micelle agent has obvious advantages over the current flocculant tailings in a mine in terms of precipitation speed,precipitation effect?precipitation dry weight,sediment sludge volume?,supernatant p H,COD and ORP indicators.The feasibility of flocculants.?3?Carry out confirmation experiments of micelles to prepare for industrial experiments.Excluding the influence of the two variables of 30m thickener slurry water concentration and sample freshness on the application effect of micelles,it is further verified that micelles have advantages over the existing flocculants in industrial production.Combined with the results of indoor feasibility experiments,it was further confirmed at the mine laboratory site that the concentration of micelle agent 0.1g/L?0.1%?is the optimal concentration adjustable for industrial experiments,and 15ml/L is the adjustable optimal dosage for industrial experiments.?4?Carry out experiments on the industrial application of micelles.Through industrial experiments to compare the effect of micelle and flocculant applied in actual industrial production.It is concluded that when the concentration of micelle agent is 0.1g/L?0.1%?and the dosage of agent is 15ml/1000ml?15ml/L?,it can effectively increase the total output of tailings by 10%and the output of fine-grained tailings by 33%;In terms of the water quality of the supernatant,the supernatant obtained after using the micelle agent is superior to the current flocculant of the lead-zinc mine in sensory,microscopic suspended solids detection data and COD data at the same concentration and dosage of the agent.Applicability of beam agent industrial application.?5?Further research on the effect of micellar agent precipitation recovery and utilization in mine filling.Combining the 42.5R cement and full tailings produced by the local cement plant to carry out filling experiments in the industrial production system,sampling and making test blocks under the-750m mine to test the compressive strength data of cubes for3days,7days and 28days It is concluded that the full tailings after the fine-grained tailings obtained by the precipitation of mixed micelles have obvious advantages over the full tailings alone as aggregate filling in the strength of the filling body,although it still cannot meet the requirement of 3Mpa in 3days.However,from the perspective of the 3-day strength,compared with the whole tailings single aggregate comparing group,it has a 78%improvement.It can be seen that the mixing of fine-grained tailings precipitated with micellar and full tailings as filling aggregates has industrial application meanings.Significance,can be promoted and applied.?6?Combined with the cost of the current flocculant in a lead-zinc mine,from the aspects of material price advantages,tailings pond operating cost estimation and cost savings from supernatant reuse,the research group analyze the use of micelles in economic dividend that can be brought about when used.Compared with the current flocculant used in a lead-zinc mine,the micelle agent has a 6%advantage in unit price.It is expected to save material costs of 900,000 yuan per year,and consider saving operating costs of about 10 million yuan for the mine after the tailings pond is withdrawn.And the reuse of supernatant liquid saves a total of39.412 million yuan in annual water cost.It is concluded that if the micelle agent is fully put into use,it is expected to save about 39.314 million yuan for the mine every year,and further determine the applicability of the micelle agent for industrial application.