Paste filling material containing ultrafine tail mud as well as preparation method and application thereof

A paste filling and filling technology, which is applied in the field of building materials, can solve the problems such as difficulty in expropriating dumping sites for mining enterprises, reducing the number of tailings ponds used, and complex mineral components, achieving no metal leaching risk and reducing raw materials. cost, the effect of improving the recycling rate

Pending Publication Date: 2021-04-27
上海宝钢新型建材科技有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the decline of ore mining grade, in order to ensure the beneficiation index, the ore grinding particle size gradually decreases, resulting in finer and finer tailings produced by the beneficiation plant, which makes the filling system related to concentration, preparation, transportation and filling The formation of body strength has brought new changes and requirements
Moreover, the mineral components of these ultra-fine tailings sand and tailings mud are complex, the use value is low and the utilization is difficult. Due to environmental protection and other requirements, it is more and more difficult for mining companies to occupy dumps. At the same time, the number of tailings ponds in use is increasing year by year. reduce

Method used

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  • Paste filling material containing ultrafine tail mud as well as preparation method and application thereof
  • Paste filling material containing ultrafine tail mud as well as preparation method and application thereof
  • Paste filling material containing ultrafine tail mud as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a mortar filling test block containing ultrafine tailings, and its preparation method includes the following steps:

[0040](1) The raw materials of the cementitious material are weighed according to the following mass percentages: 35% of converter steel slag, 50% of blast furnace slag, 15% of desulfurized gypsum, and the desulfurized gypsum is ground to a specific surface area of ​​300m 2 / kg, the steel slag is ground to a specific surface area of ​​420m 2 / kg, grind the slag to a specific surface area of ​​500m 2 / kg;

[0041] (2) According to the mass ratio of cementitious material and ultrafine tailings is 1:4, take ultrafine tailings by weighing;

[0042] (3) Weigh the raw materials obtained in mixing steps (1) and (2), add water according to the slurry concentration of 74%, and stir evenly;

[0043] (4) After pouring and molding, it is maintained to different ages for compressive strength testing: according to GB17671-1999 "Cement Morta...

Embodiment 2

[0045] This embodiment provides a mortar filling test block containing ultrafine tailings, and its preparation method includes the following steps:

[0046] (1) Take the raw materials of the cementitious material according to the following mass percentages: 40% of converter steel slag, 40% of blast furnace slag, 20% of desulfurized gypsum, and grind the desulfurized gypsum until the specific surface area is 300m 2 / kg, the steel slag is ground to a specific surface area of ​​420m 2 / kg, grind the slag to a specific surface area of ​​500m 2 / kg;

[0047] (2) According to the mass ratio of cementitious material and ultrafine tailings is 1:4, take ultrafine tailings by weighing;

[0048] (3) Weigh the raw materials obtained in mixing steps (1) and (2), add water according to the slurry concentration of 76%, and stir evenly;

[0049] (4) After pouring and molding, it is maintained to different ages for compressive strength testing: according to GB17671-1999 "Cement Mortar Stren...

Embodiment 3

[0051] This embodiment provides a mortar filling test block containing ultrafine tailings, and its preparation method includes the following steps:

[0052] (1) The raw materials of the cementitious material are weighed according to the following mass percentages: 30% of converter steel slag, 60% of blast furnace slag, 10% of desulfurized gypsum, and the desulfurized gypsum is ground to a specific surface area of ​​300m 2 / kg, the steel slag is ground to a specific surface area of ​​420m 2 / kg, grind the slag to a specific surface area of ​​500m 2 / kg;

[0053] (2) According to the mass ratio of cementitious material and ultrafine tailings is 1:6, take ultrafine tailings by weighing;

[0054] (3) Weigh the raw materials obtained in mixing steps (1) and (2), add water according to the slurry concentration of 78%, and stir evenly;

[0055] (4) After pouring and molding, it is maintained to different ages for compressive strength testing: according to GB17671-1999 "Cement Mort...

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Abstract

The invention relates to a paste filling material containing ultrafine tail mud as well as a preparation method and application of the paste filling material. The filling material is prepared from the following raw materials: a cementing material, aggregate and water, wherein the cementing material comprises the following components in parts by weight: 40-80 parts of converter steel slag, 5-30 parts of desulfurized gypsum and 0-20 parts of desulfurized ash; the aggregate comprises superfine tail mud; the mass ratio of the cementing material to the aggregate is 1: 4-6; the slurry concentration is 55-70%. According to the filling material, a large amount of superfine tail mud is utilized, good compressive strength (larger than or equal to 10 MPa) capable of being industrially applied is achieved without adding a water reducing agent, it is guaranteed that the filling material has good practical value, and the problem that the roof contact rate of a stope is not high is solved. The method is beneficial to solving the problems of reduction, harmlessness and recycling of industrial solid waste, solving the problem of tailing stockpiling, and promoting cooperative utilization of solid waste and hazardous waste and environmental protection; meanwhile, cyclic utilization of water resources is achieved through pre-plant return water, and therefore waste of the water resources is reduced.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a paste filling material containing ultrafine tailings, a preparation method and application thereof. Background technique [0002] A large amount of tailings produced in mining production is stored on the ground, which is likely to cause safety hazards and ecological environment problems. Filling mining technology backfills the goaf with tailings and other wastes, which plays an increasingly important role in improving resource recovery, protecting the environment, and ensuring mining safety. The filling mining method is also widely used. [0003] However, with the decline of ore mining grade, in order to ensure the beneficiation index, the ore grinding particle size gradually decreases, resulting in finer and finer tailings produced by the beneficiation plant, which makes the filling system related to concentration, preparation, transportation and filling The formation of bod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/144C04B2201/50C04B18/142C04B18/141C04B18/0418
Inventor 张思奇王林张铭亘倪文王宗森黄威李克庆汪坤滕国翔
Owner 上海宝钢新型建材科技有限公司
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