Jinchuan Mine Waste Gypsum Body Preparation And Rheological Properties

Jin Chuan Group Limited Company(JNMC)is the biggest production base of nickel and cobalt in China,and the cutting and filling in underhand road is used by the three big underling mines of JNMC.Along with mine productivity enlarging,commented filling aggregate of the company exists big gap.For example,the rod milling sand gap amounts to above 200,000 tons in 2007.Because of entire tails cemented fill existing flaws of low intensity and big cement consumption quantity and so on,the mine can not but seek the new fill aggregate.In this research,by fully using the waste water,the scrap rock and the entire tails which produced by Jin Chuan mine underground,we break the underground scrap rock to certain degree,proceed organic combination with the cementing agent and the admixture and so on,and compound the scrap rock concrete which satisfy the intensity requests of the road commented roof.And we also study the preparation craft,the intensity, the rheological characteristic and the multi-factor influence rule.These all adapt to the scrap rock concrete paste body of the mine underground fill and provide theory basis and design support to the computation of the resistance loss of the fill pipe system along the link and the system design of the fill pipe system.In this research,in order to achieve the goal which the single axle compressive strength of cemented body satisfying R³≥1.5MP,R⁷≥2.5MP,R₂8≥5MP,we carry on the strength test,the room rheological experiment,the pumpability experiment and so on.By using multi-dimensional linear regression method,we obtain the intensity equation and visually,quantizingly discuss synthetic influence of the slurry density,the consumption of the cement and the ratio between scrap rock and tails to the slurry intensity.We obtain that the slurry density and the consumption of the cement are the main factors influencing fill body intensity and increasing slurry density is the effective way to improve intensity.By the result of rheological experiment,we regress to the rheological equation of the slurry and obtain the conclusion that slurry rheological model belongs to the false plastic body with yield stress.Applying multi-dimensional linear regression method,we discuss the effect of various factors to rheological parameter and get the result that the slurry density is the biggest influencing factor to initial stress,and the initial stress is increasing along with the density increasing;Viscosity coefficient k is increasing with the density increasing and decreasing with the ratio between scrap rock and tails increasing.But the effect of the ratio between scrap rock and tails is smaller than the effect of density.These conclusions provide powerful basis for later pipeline passport experiment and industrial design.By experimental investigation,we optimize reasonable mixture ratio which costs lowest and conforms to the intensity request of Jin Chuan mine fill body craft.When the slurry weight density scope is between 77%～80%,the consumption of the cement achieves above 260kg/ m³,the scrap rock and the tails mixture ratio between 6.0:4.0-6.5:3.5 is the optimum mixture ratio and the briquette intensity satisfies the request; When slump constant is between 19～23cm,it satisfies the pumpability request;The fill body of scrap rock slurry has high intensity and no lamination,and the cement use level of it has reduced 50～70Kg/m³ comparing to the cement use level of the rod milling sand and the graduated tails fill craft which now used by the mine.Besides,the fragmentation cost of the scrap rock is low,the haul distance is short and the material is easy to aggregate. Therefore the fill cost of the fill body of scrap rock slurry comparing to the fill cost of the rod milling sand,the filling cost has reduced 31～36yuan/m³ only on material cost in Jinchuan mine.The method using the scrap rock excavated by the mine to backfill although has studied and applied many years,according to those mines using cutting and filling1 the fill craft is not been reported home and abroad,which after crushing the underground scrap rock locally,using the underground project waste water,adding the fine grain of industrial waste material and the cementing agent to compound the scrap rock concrete,and then pumping and piping to the goaf.Along with the mining industry development aggravating, the industrial waste,the scrap rock and the waste gas are massively emitted.And this has caused the deterioration of natural ecological environmental.The people more and more realize the importance of enhancing mine environmental protection and the comprehensive utilization of the mine resources.Therefore the construction of no waste mine becomes the inevitable trend of the time development.Clearly,this research is not only one of the effective ways to solve the present mining and filling contradiction,but also has the environmental protected,economical and the time advanced significance.At the same time, it belongs to the category of technical difficult problems which currently existing.In short, this project has the significance of the energy conservation,the reduction of emission and the scientific and technical innovation.