Experimental study on the principle and proportion of yellow sand grouting into glue in Mengxi Mining Area

In order to make full use of surface yellow sand as the grouting material of Nalinhe No.2 Mine in Mengxi Mining Area, the main components of yellow sand and loess of the mine surface, as well as suspension and cementing agent selected for the test were analyzed, the gelation principle of compound glue was studied, the matching experiments of colloidal suspension sand were carried out in the case of using suspension and the use of both suspension and gelling agent respectively. The results show that the main component of the yellow sand of Nalinhe No. 2 Mine is SiO₂, Al₂O₃ and CaO₂, the main components of loess are SiO₂, CaCO₃ and CaC₂O₄; the maximum solubility of gelling agent in water is 2.0%, there is an optimal ratio of suspending agent and gelling agent in colloidal suspension sand, that is, suspension agent and gelling agent account for 2.0% respectively, according to the actual needs of the site and the distance of grouting line, the water-sand mass ratio is selected at 2∶1.