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Circulating fluidized bed combustion ash based filling cemented material and preparation method of slurry of circulating fluidized bed combustion ash based filling cemented material

A technology of cementing material and filling slurry, which is applied in the field of mine filling cementing material and its preparation, can solve the problems of high cost, unfavorable application and development of tailings filling technology, high pollution, etc., achieve low bleeding rate and reduce filling cost , the effect of good fluidity

Pending Publication Date: 2018-12-11
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional cement-based filling materials consume a large amount of cement, and the energy consumed by Portland cement production is second only to the iron and steel smelting industry, which means high pollution and high cost, which is not conducive to the application and development of tailings filling technology

Method used

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  • Circulating fluidized bed combustion ash based filling cemented material and preparation method of slurry of circulating fluidized bed combustion ash based filling cemented material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A sulfur-fixed ash-based filling cementing material, the raw materials and mass percentages are as follows:

[0020] 29% sulfur-fixed ash, 34% phosphorus tailings, 8.5% activator, 27.5% tap water.

[0021] Described exciter is the combination of water glass, unslaked lime and sodium sulfate, wherein water glass 2.8%, unslaked lime 5% (counted in cementitious material), sodium sulfate 0.7% (calculated in cemented material); Described percentage is all is the mass percentage.

[0022] The mortar weight ratio of the cementitious material to the fine aggregate is 1:1, and the solid mass concentration of the slurry is 70%; the stated percentages are all mass percentages.

[0023] The main chemical composition of the sulfur-fixing ash is SiO 2 、Al 2 o 3 , CaO and SO 3 , the specific surface area is not less than 350㎡ / kg.

[0024] The main chemical components of the phosphorus tailings are CaO, MgO and P 2 o 5 , the average particle size is 23.8μm, and the specific sur...

Embodiment 2

[0027] A sulfur-fixed ash-based filling cementing material, the raw materials and mass percentages are as follows:

[0028] 14% sulfur-fixed ash, 52% phosphorus tailings, 4.3% activator, 29.7% tap water.

[0029] Described exciter is the combination of water glass, unslaked lime and sodium sulfate, wherein water glass 1.3%, unslaked lime 2.6% (counted in cementitious material), sodium sulfate 0.4% (calculated in cemented material); Described percentage is all is the mass percentage.

[0030] The mortar weight ratio of the cementitious material to the fine aggregate is 1:3, and the solid mass concentration of the slurry is 70%; the stated percentages are all mass percentages.

[0031] The main chemical composition of the sulfur-fixing ash is SiO 2 、Al 2 o 3 , CaO and SO 3 , the specific surface area is not less than 350㎡ / kg.

[0032] The main chemical components of the phosphorus tailings are CaO, MgO and P 2 o 5 , the average particle size is 23.8μm, and the specific s...

Embodiment 3

[0036] A sulfur-fixed ash-based filling cementing material, the raw materials and mass percentages are as follows:

[0037] 12% sulfur-fixing ash, 58% phosphorus tailings, 3.6% activator, 26.4% tap water.

[0038] Described exciter is the combination of water glass, unslaked lime and sodium sulfate, wherein water glass 1.1%, unslaked lime 2.2% (counted in cementitious material), sodium sulfate 0.3% (calculated in cemented material); Described percentage is all is the mass percentage.

[0039] The mortar weight ratio of the cementitious material to the fine aggregate is 1:4, and the solid mass concentration of the slurry is 73%; the stated percentages are all mass percentages.

[0040] The main chemical composition of the sulfur-fixing ash is SiO 2 、Al 2 o 3 , CaO and SO 3 , the specific surface area is not less than 350㎡ / kg.

[0041] The main chemical components of the phosphorus tailings are CaO, MgO and P 2 o 5 , the average particle size is 23.8μm, and the specific ...

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Abstract

The invention discloses a circulating fluidized bed combustion ash based filling cemented material and a preparation method of slurry of the circulating fluidized bed combustion ash based filling cemented material. The circulating fluidized bed combustion ash based filling cemented material is prepared by taking circulating fluidized bed combustion ash as a cementing material and phosphate tailings as fine aggregates, and using water glass, quick lime and sodium sulfate for composite excitation. The cemented material comprises the following raw materials in percentage by weight: 12-30 percentof the circulating fluidized bed combustion ash, 34-58 percent of the phosphate tailings, 1.1-2.6 percent of the water glass, 2.1-5.2 percent of the quick lime, 0.3-0.7 percent of sodium sulfate and 26-30 percent of tap water. In the circulating fluidized bed combustion ash based filling cemented material, the activity of volcanic ash of the circulating fluidized bed combustion ash is relatively low; and by using the water glass and sodium sulfate, the early compressive strength of the cemented material is remarkably improved; and by adding the quick lime, the later compressive strength of thecemented material is improved. The filling material fully utilizes industrial waste slag, is low in bleeding rate, good in mobility and high in compressive strength, greatly lowers the filling cost and is environmentally friendly.

Description

technical field [0001] The invention relates to a mine filling cementing material and a preparation method thereof. Background technique [0002] With the introduction of national policies such as building green mines, improving comprehensive resource utilization, energy conservation and emission reduction, and environmental protection, the tailings filling mining method has emerged as the times require. The tailings filling method uses the tailings as the aggregate to prepare the filling body, and transports the filling slurry to the goaf underground to form a filling body with a certain strength, which can then support the surrounding rock or store tailings waste. Tailings filling can not only save tailings storage costs, reduce environmental pollution, but also effectively avoid problems such as landslides in goafs. In recent years, the tailings filling method has been used in many mines as an efficient and safe mining method. Technologies such as full tailings filling, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2111/00724C04B2201/50C04B18/0481C04B12/04C04B22/064C04B22/147C04B22/002
Inventor 刘冬梅卢希高德军柯帅徐港
Owner CHINA THREE GORGES UNIV
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