Filling slurry optimization method for downward layered filling method mining by using waste rock

Abstract

The invention discloses a filling slurry optimization method for downward layered filling method mining by using waste rock. The method comprises the following steps: with coarse waste rock aggregateand rod-milled sand as mixed aggregate,; designing mixed filling aggregates with different proportions of waste rock and rod-milled sand, and a test scheme of different gel-sand ratios and slurry concentrations of the mixed filling aggregates to obtain a test result of the strength of the cemented filling body and the fluidity and stability of the filling slurry; conducting stepwise regression analysis on the test data through a quadratic polynomial, and establishing a relation function between the waste rock utilization rate and the mortar ratio, between the waste rock utilization rate and the slurry concentration, between the filling body strength and between the slurry fluidity and stability; establishing a filling material cost model; determining design indexes of the cemented fillingbody; and establishing a filling material multi-objective optimization model, thereby solving the target optimization model to obtain an optimization design. According to the method, the strength of the cemented filling body and the fluidity and stability of the slurry meet the filling mining requirements, the filling material cost is lowest, and the waste rock utilization rate is highest.

Description

technical field [0001] The invention belongs to the technical field of filling and mining, in particular to a filling slurry optimization method for waste rock used in mining by the downward layered filling method. Background technique [0002] With the rapid development of my country's national economy and the continuous development of resources, high-grade and good-condition resources are increasingly depleted, and more difficult-to-mine ore bodies such as deep burial, high ground pressure, and rich water are faced with mining. For safety, environmental protection and green mining, the filling and filling mining method is the first choice. Especially for complex and difficult-to-mining ore bodies with weak and broken surrounding rocks, it is necessary to protect them under the false roof of the filling body to achieve safe operation, so the downward layered filling mining method is the only choice. This filling mining method has complicated mining process, low production ...

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Problems solved by technology

[0004] Chinese patent application CN103130475A discloses cemented filling slurry for self-flowing transportation of coarse aggregate pipelines, and discloses the proportion of mixed coarse aggregate filling slurry in which mung bean stone replaces part of the rod frosting, but does not involve the strength of the mixed aggregate filling body and the slurry pipe output characteristics

CN108661703A discloses a filling method and filling system for coarse-grained tailings paste, and has invented a filling system and preparation process for filling slurry mixed with waste rock coarse aggregate and mineral processing tailings, and does not consider the ratio of waste rock coarse aggregate to cementation Influence of filling body strength and slurry pipeline transportation characteristics

CN107117888A discloses a method for decision-making on the ratio of mixed aggregate filling slurry for mining, with the cost of filling material as the optimization target, and the filling body strength, fluidity and stability of the filling slurry as constraints, and the filling of mixed coarse aggregate Slurry optimization decision; however, it does not consider the influence of waste rock utilization rate on its strength and pipeline transportation characteristics, and does not maximize the waste rock utilization rate

CN110143787A discloses a low-cost waste rock cemented filling material component and proportion design method, after the slump of the filling slurry is fixed, the waste rock gradation, sand content, cementing material component and proportion, The content of cementing material is optimized to determine the composition and proportion of the waste rock cemented filling material, and according to the strength of the waste rock cemented filling body in the mine, the minimum cementing material content value is calculated by using the relationship between cementing material content and strength formula; The mixed aggregate ratio optimization method does not comprehensively consider the filling body strength and slurry fluidity and stability, and adopts a trial-and-error optimization method, which makes it difficult to obtain the overall optimal ratio of waste rock slurry

CN106746946B discloses a method for optimizing the ratio of filling materials. Based on the NSGA-II algorithm, the optimal search for the ratio of filling materials is carried out, and the value range of the ratio of filling materials is limited; the group size, calculation algebra, crossover probability, mutation probability, etc. are set. Genetic parameters; set the pre-configured filling body strength value, and optimize the search to obtain a non-dominated solution set containing several sets of solutions; finally, combined with the mine transportation conditions, select the filling body strength requirements that meet the mining method and meet the mine transportation conditions. And a set of solutions with the lowest cost is used as the filling material ratio parameter; it can be seen that this method is to design the ratio of waste rock coarse aggregate under the condition of determining the filling body strength, and fails to consider the impact of filling slurry segregation on waste rock utilization. optimize decision-making

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