A cementing agent for cemented filling of fine tailings

Abstract

The invention discloses a cementing agent for micro-fine-particle tailing cementing filling. The cementing agent is prepared in the mode that following components are matched, mixed and ground to powder with the specific area of 600 m<2> / kg-800 m<2> / kg, and comprises, by mass, 75%-85% of superfine slag powder, 6%-12% of activating agent, 0.5%-0.8% of activating accelerant, 0.3%-0.6% of accelerating agent, 0.1%-0.3% of pumping agent and 6.65%-12.5% of reinforcing agent. The superfine slag powder is the S105 grade, and the specific area of the superfine slag powder is larger than or equal to 600 m<2> / kg; the activating agent is a mixed compound of quick lime, sodium aluminate and sodium orthosilicate, the activating accelerant is sodium fluoride, the accelerating agent is a mixed compound of sodium thiocyanate and anhydrous calcium chloride, the pumping agent is a nonionic surfactant, and the reinforcing agent is a mixed compound of plaster stone, semi-hydrated gypsum, calcined gypsum and aluminum sulfate. The cementing agent has the advantages of being short in setting time, high in early strength and strength, low in cost, easy to convey and produce and simple in technology.

Description

technical field [0001] The invention belongs to the technical field of tailings cemented filling materials, and in particular relates to a gelling agent for fine-grained tailings cemented filling, especially suitable for the content of -0.037mm particle size in materials after classification of various metal tailings. ≥ 95%, -0.02mm grain fraction content in the range of 70% to 80% of the cemented filling of fine tailings. Background technique [0002] Since entering the industrial society, the human demand for energy is increasing day by day. While mining brings mineral resources, it also produces a large number of goafs and tailings. These untreated goafs and tailings pools formed on the surface have brought major safety hazards to enterprises and society. [0003] Mine filling is an effective method to control mining subsidence. Scholars at home and abroad have done a lot of research on it and proposed many effective methods. Since the 1950s, the development of mine fil...

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Problems solved by technology

[0007] (1) The utilization rate of tailings is low, and the treatment of fine-grained tailings is difficult

When using thick tailings as aggregate, it is necessary to classify the whole tailings and remove the fine-grained grades. The particle size of this part of tailings is very small, it is difficult to solidify, the curing strength is low, and it is difficult to build a dam, which further increases the size of the tailings. The difficulty of mine treatment increases the construction cost of tailings ponds and aggravates environmental pollution

[0008] (2) For some minerals with complex occurrence conditions and low grades, further fine grinding is required to increase the recovery rate, so that the average particle size of the ore body is less than 0.03mm, and -800 mesh is greater than 50%, +200 mesh is less than 10% and +400 mesh is less than 30%, these ultra-fine full tailings have a slow settlement speed, less than one tenth of the graded tailings, difficult to carry out thickening, poor permeability, one percent of the graded tailings, difficult to dehydrate, and the pore pressure of the tailings Large, low consolidation strength

[0009] (3) High filling cost

However, the cost of graded ultra-fine tailings, ultra-fine full tailings and tailings in the above technologies is still high, so it is imminent to develop a cementitious material product for ultra-fine tailings filling and dry stacking with low cost and simple construction

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