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Cemented filling material

A technology of filling and filling slurry, which is applied in the field of mine filling materials, can solve the problems that the curing strength cannot meet the mining requirements, the filling cost increases, and it is difficult to meet the requirements, etc., and achieves the advantages of shortening the filling cycle, low filling cost and short curing time Effect

Inactive Publication Date: 2016-04-20
CINF ENG CO LTD
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Problems solved by technology

Adding cement will greatly increase the filling cost
[0004] (2) Low curing strength
Although the filling cost is reduced, the curing strength cannot meet the mining requirements (generally, the strength of the 3d filling body is not less than 1.5MPa, and the strength of the 7d filling body is not less than 2.5MPa)
For example, patent CN201210411684 discloses a mixed material for mine shaft filling, which needs to be mixed with 10% to 24% yellow phosphorus slag instead of cement as a cementitious material, and its 28d curing strength is only 0.72MPa, which is difficult to meet the requirements
[0005] (3) Long curing time
Patent CN200710193247 discloses that phosphogypsum is used for cementing and filling in mine goafs. Although the gelation of cement is optimized by adding water-quenched iron (steel) slag and lime, it still takes 5 to 8 days to solidify before the compressive strength can reach 1.5MPa, long curing time

Method used

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Embodiment 1～7

[0021] Embodiments 1 to 7: the whole tailings produced by the single reverse flotation process of the dressing plant and the hemihydrate phosphogypsum produced by the phosphoric acid production by the semi-wet method of the phosphating plant (the weight content of crystal water is 5.3~8.63%) ) according to the dry basis ratio of 1:3~1:4, lime and hemihydrate phosphogypsum according to the dry basis ratio of 1.2%~2.0%, then add water to mix and pour it into a horizontal mortar mixer for 3 minutes, and stir until the mass concentration is 69%~ 73% of the filling slurry was used to prepare the filling slurry used for downhole filling or experiments. The data of each embodiment are shown in Table 1. The filling slurry needs to be stirred evenly before it can be transported to the empty space in the well and solidified to form a high-strength cemented filling body.

[0022] According to GB / T50080-2002 "General Concrete Mixture Performance Test Method Standard", take the filling slu...

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Abstract

The invention relates to a cemented filling material which comprises hemihydrated phosphogypsum, crude tailings and lime, wherein the weight ratio of the crude tailings to the hemihydrated phosphogypsum is 1:3-1:4, the weight ratio of the lime to the hemihydrated phosphogypsum is 1.2-2.0%, and the crystalline water content in the hemihydrated phosphogypsum is less than 9.5%. The filling material has the advantages of very low cost, short curing time and high curing strength, is green and environment-friendly, and can be used for downhole filling.

Description

technical field [0001] The invention belongs to the technical field of mine filling materials, and in particular relates to a novel cemented filling material. Background technique [0002] At present, the domestic wet-process phosphoric acid process is mainly based on the dihydrate method. When the dihydrate method produces phosphoric acid, the by-product dihydrate phosphogypsum (CaSO 4 2H 2 O) as a cemented filling material has been widely used in the field of mine filling. However, the following problems exist when using dihydrate phosphogypsum for cemented filling: [0003] (1) The filling cost is high. Due to the small gelling effect of phosphogypsum dihydrate, when using it for cemented filling, in order to ensure that the 3d strength and 7d strength of the solidified filling body meet the mining requirements, it is generally necessary to mix a high proportion of cement as a cementitious material. For example, the cementitious material for fine-grained tailings fill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B18/14C04B22/06
CPCC04B28/14C04B2201/50C04B18/145C04B22/06Y02W30/91
Inventor 尤祎廖江南刘福春李晓芸
Owner CINF ENG CO LTD
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