Superfine tailing cemented filling soft soil curing agent and preparation method and application thereof

Abstract

The invention discloses a superfine tailing cemented filling soft soil curing agent as well as preparation and application thereof. The superfine tailing cemented filling soft soil curing agent is prepared from 41-56 wt% of mineral powder, 10-11 wt% of steel slag powder, 20-35 wt% of gypsum powder, 9-11 wt% of an alkaline activator and 1-3 wt% of an activating agent. The soft soil curing agent is used for superfine tailing cemented filling, filling can be performed under the conditions of lower cement-sand ratio and high slurry concentration, better slurry flowing performance and consolidated body strength performance can be kept, main raw materials of the soft soil curing agent are bulk industrial solid waste, a large amount of solid waste can be consumed, resource utilization of a large amount of industrial solid waste is achieved, and the problems that the cement-sand ratio is large, the fluidity is poor, the cost is high, and the strength of a filling body is low in superfine tailing cemented filling are solved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a resource utilization method of industrial solid waste, in particular to an ultrafine tailings cemented filling soft soil curing agent and its preparation method and application. Background technique [0002] Generally speaking, the content of valuable metals in ores is generally low, so the mining of mineral resources will produce a lot of tailings. China is rich in mineral resources, and the amount of tailings produced and accumulated every year is huge. With the improvement of national awareness of environmental protection and the country's stringent requirements for mining environmental safety, mining methods that reduce or even eliminate waste in mining areas are an inevitable direction for the development of mining technology. The filling mining method has the characteristics of low dilution rate and high recovery rate of mineral resources, which can realiz...

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Problems solved by technology

[0005] With the development of mining technology, in order to improve the extraction rate of valuable components, the grinding fineness in the process of ore mining will become finer and finer, so the fineness of the tailings particles produced will also be finer and finer, such as this The whole tailings of Yinshan Mine of Jiangxi Copper Group produced in the invention belong to gold mines, which have high requirements for ore mining, so the grinding fineness is very fine, and the median diameter of the tailings is D 50 The minimum value is 8.78 μm, and the average value is 15.61 μm, which belongs to ultra-fine tailings. At present, the commonly used cement filling only has a good consolidation effect on coarse-grained tailings. For ultra-fine tailings, due to the particle size gradation As well as the specific surface area of ​​tailings and other characteristics, the consolidation effect of traditional cement filling on ultra-fine tailings is poor, and it is difficult to take into account the strength performance of the consolidated body, the flow performance of the filling slurry and the filling cost. Therefore, in order to solve Jiangxi Copper The downhole filling problem of the ultra-fine tailings in Yinshan Mine of the Group urgently needs to be aimed at the properties of the ultra-fine tailings to develop a specific tailings cementation and filling soft soil curing agent to solve the problem of tailings treatment and disposal in mining and dressing operations. Realize the recycling of industrial solid waste in mines, and at the same time solve the safety problems of mine goafs and avoid safety accidents

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