Granted Patent B1

US 12,649,887 · App. 19/180,298 · Granted Jun 9, 2026

Inventors: Shaoqing Guo (Taiyuan, CN); Meng Li (Taiyuan, CN); Libing Gao (Taiyuan, CN); Guohong Feng (Taiyuan, CN); Xianxian Wei (Taiyuan, CN); Yanzhi Cao (Taiyuan, CN)

Assignee: Taiyuan University of Science and Technology

C10L1/326C10L1/106C10L1/146C10L1/1275C10L1/1291C10L1/1976C10L1/2381C10L1/2437C10L2250/04

Abstract

Claims (23)

1 . A high-concentration filling slurry of coal gangue, wherein the high-concentration filling slurry of coal gangue comprises following components in parts by mass:

filling aggregate: 65-85 parts; the filling aggregate comprises coarse aggregate and fine aggregate;

wherein the coarse aggregate comprises coal gangue particles with following gradations:

20-30 parts of coal gangue particles with a particle size ≥10 mm and ≤20 mm;

20-30 parts of coal gangue particles with a particle size ≥5 mm and <10 mm; and

10-20 parts of coal gangue particles with a particle size ≥1 mm and <5 mm;

the fine aggregate comprises coal gangue particles with following gradations:

5-10 parts of coal gangue particles with a particle size ≥500 μm and <1 mm;

5-10 parts of coal gangue particles with a particle size ≥200 μm and <500 μm; and

5-10 parts of coal gangue particles with a particle size <200 μm;

0.001-0.01 part of a suspending agent; wherein the suspending agent comprises the following components in parts by mass: 1-10 parts of polycarboxylate and 1 part of sodium allyl sulfonate;

0.001-0.05 part of a dispersant; wherein the dispersant is sodium metasilicate or sodium disilicate;

0.01-0.1 part of an active agent; wherein the active agent comprises the following components in parts by mass: 1 part of desulfurization gypsum and 1-10 parts of water glass;

0.001-0.01 part of a water-fixing agent; wherein the water-fixing agent comprises the following components in parts by mass: 1 part of polyacrylamide, 1-5 parts of lignin and 1-10 parts of cellulose; and

20-35 parts of water.

2 . A preparation method of the high-concentration filling slurry of coal gangue according to claim 1 , comprising following steps:

S 1 : firstly, crushing and screening coal gangue raw materials to obtain coal gangue particles with particle sizes ≥10 mm and ≤20 mm, ≥5 mm and <10 mm, ≥1 mm and <5 mm, and <1 mm respectively; then, shaping and classifying screened coal gangue particles with a particle size of <1 mm by an air mill process to obtain coal gangue particles with particle sizes of ≥500 μm and <1 mm, ≥200 μm and <500 μm, and <200 μm respectively; and finally, weighing raw materials for standby according to a mass fraction of coal gangue particles in coarse aggregate and fine aggregate;

S 2 : evenly dividing water into two equal parts, respectively adding the dispersant and the suspending agent into the water according to mass parts to prepare a dispersant solution and a suspending agent solution, and evenly dividing the dispersant solution into two equal parts for later use;

S 3 : mixing the coarse aggregate weighed in the S 1 with the suspending agent solution prepared in the S 2 at a temperature of 30-35° C., and uniformly stirring to prepare a first mixture;

S 4 : mixing the first mixture prepared in the S 3 with any dispersant solution prepared in the S 2 , and uniformly stirring to prepare a second mixture;

S 5 : mixing the fine aggregate weighed in the S 1 with a remaining dispersant solution prepared in the S 2 , and uniformly stirring to prepare a third mixture;

S 6 : mixing the second mixture prepared in the S 4 and the third mixture prepared in the S 5 at the temperature of 30-35° C., adding the active agent and uniformly stirring to prepare a filling slurry precursor; and

S 7 : standing the filling slurry precursor prepared in the S 6 at the temperature of 30-35° C. for 0.5-1 h, then adding the water-fixing agent, and uniformly mixing to obtain the high-concentration filling slurry of coal gangue.

Assignments (1)

Priority Claims (1)

References Cited (17)