A phosphogypsum-based cementitious material and its application in mine tailings filling

Abstract

The invention relates to a gelling material for mine tailing filling. The gelling material for mine tailing filling used for improving the early stage strength of a filler and having good water segregation performance is obtained through the steps of respectively milling phosphogypsum, red mud, phosphorus residues and clinker to 800m<2> / kg, 700m<2> / kg, 300m<2> / kg and above 300m<2> / kg respectively, uniformly mixing the above milled raw materials, and adding an exciting agent. The gelling material is used to carry out mine tailing filling, and the raw materials are from various industrial waste residues, so the gelling material has the advantages of low cost, simple technology, strong maneuverability, low filling cost, effective utilization of various industrial waste residues of the metallurgy industry, energy saving, emission reduction and environmental protection.

Description

technical field [0001] The patent of the present invention relates to a cementitious material for tailings filling. The phosphogypsum, red mud, phosphorus slag, and clinker are ground separately, mixed according to a certain ratio, and a certain composite activator is added to obtain a cementitious material for tailings filling that improves the early strength of the filling body and has good bleeding performance. Background technique [0002] Phosphogypsum is the industrial waste mainly dihydrate gypsum discharged from phosphoric acid produced by wet process of phosphate rock raw material. 1 ton of phosphoric acid produces 5-6t (dry basis) of phosphogypsum, and the actual amount is about 7t. Phosphogypsum is strongly acidic and its pH value is between Between 2 and 3, it contains a large amount of impurities different from natural gypsum, which will cause environmental pollution to water and soil during the storage process. The comprehensive utilization of phosphogypsum as...

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Problems solved by technology

However, in the traditional tailings consolidation and filling technology, cement is generally used as a consolidation material to solidify the tailings. However, the unit consumption of cement is very large, resulting in high tailings filling costs. The filling cost accounts for 10% of the total mining cost. About 30%, cement glue tailing sand filling has problems such as difficult dehydration, low strength of consolidated body, large cement unit consumption, and high filling cost, which are also the main factors that make tailings filling technology difficult to promote in my country

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