AU2021103385A4 - Cemented backfill materials containing circulating fluidized bed incineration fly ash and its preparation method - Google Patents

Cemented backfill materials containing circulating fluidized bed incineration fly ash and its preparation method Download PDF

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AU2021103385A4
AU2021103385A4 AU2021103385A AU2021103385A AU2021103385A4 AU 2021103385 A4 AU2021103385 A4 AU 2021103385A4 AU 2021103385 A AU2021103385 A AU 2021103385A AU 2021103385 A AU2021103385 A AU 2021103385A AU 2021103385 A4 AU2021103385 A4 AU 2021103385A4
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parts
cementing
fly ash
backfill materials
fluidized bed
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Wei Gao
Jia Li
Jiajie LI
Wen NI
Tengyu Shi
Siqi Zhang
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • C04B7/24Cements from oil shales, residues or waste other than slag
    • C04B7/26Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • C04B28/142Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
    • C04B28/144Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F15/00Methods or devices for placing filling-up materials in underground workings
    • E21F15/005Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/10Production of cement, e.g. improving or optimising the production methods; Cement grinding

Abstract

The invention relates to a cementing backfill materials containing circulating fluidized bed incineration fly ash, which comprises a cementing material and iron tailings, wherein the mass ratio of the cementing material to the iron tailings is 1:4; The cementing material comprises the following raw materials in parts by weight: 20-90 parts of slag, 5-60 parts of circulating fluidized bed incineration fly ash and 6-15 parts of desulfurized gypsum. The cemented backfill materials can meet the high compressive strength (4 ~ 5 MPa) required for filling goaf, and can be used as mining backfill materials. The filling performance (rheology, fluidity and setting time) of the cemented backfill materials provided by the present invention is better than cement at the same ratio, which makes it a good substitute for cement. After long-term maintenance, the leaching concentration of heavy metal ions and soluble salts is lower than the underground Class III water quality standard. The cemented backfill materials makes use of materials such as circulating fluidized bed incineration fly ash and slag, which not only realizes the environmental protection purpose of treatment, but also reduces the cost of cemented filling mining technology, and realizes the win-win situation of treating with and green filling.

Description

Cemented backfill materials containing circulating fluidized bed incineration fly ash
and its preparation method
TECHNICAL FIELD
The invention relates to the field of cemented filling mining, in particular to a cemented
backfill materials containing circulating fluidized bed incineration fly ash and its
preparation method.
BACKGROUND
In the mining industry, in order to achieve the goal of safety, environmental protection
and full recovery of non-renewable resources, it is required that the mined-out area be
filled in time and effectively, and the surrounding rock be supported integrally by the
filling body, the ground pressure activity be controlled, and the working face be provided
for mining ore. Therefore, the filling mining method is being paid more and more
attention and popularized by the mining industry at home and abroad.
Cemented filling is the core of backfilling mining method. Cemented filling method
generally uses crushed stone, river sand, tailings or Gobi aggregate as aggregate
(sometimes mixed with block stones), which is mixed with cement or lime cementing
materials to form slurry or paste, which is transported to the filling area by pipeline
pumping or gravity flow for filling. Compared with water-sand filling, cemented filling
has higher strength, faster filling speed, larger filling amount and simpler process. With
the development of materials science, there are various types and varieties of cementing
materials, and filling methods including various cementing materials, such as tailings
cementing filling, block stone cementing filling and paste pumping filling, have been developed.
As a with potential for reuse, the disposal and resource utilization of fly ash from
municipal solid incineration has been studied and applied in recent years, Using fly ash
from municipal solid incineration in cemented filling technology can not only reduce the
filling cost, but also facilitate the treatment and utilization of garbage. However, dioxin,
soluble salts and heavy metals are the main components in fly ash from municipal solid
incineration, which restrict the resource utilization of fly ash.
Therefore, those skilled in the art have the motivation to find a low-cost, safe and
efficient cementing filling method for the disposal of industrial and incineration fly ash,
so as to achieve the environmental protection purpose of disposal, reduce the cost of
cementing filling mining technology, and achieve a win-win situation of treating with and
green filling.
SUMMARY
The purpose of the present invention is to provide a cementing backfill materials
containing circulating fluidized bed incineration fly ash and its preparation method. The
cementing backfill materials is doped with circulating fluidized bed incineration fly ash,
which can meet the higher required compressive strength (4-5 MPa) for filling goaf, can
be used as a mining backfill materials, and is a good substitute for cement; After long
term maintenance, the leaching concentration of various heavy metal ions and soluble
salts (Cl-, S0 42 -) is lower than the underground Class III water quality standard, and the
leaching risk is within the controllable range.
Therefore, in the first aspect of the present invention, a cementing backfill materials
containing circulating fluidized bed incineration fly ash is provided, which comprises a cementing material and iron tailings, wherein the mass ratio of the cementing material to the iron tailings is 1:4;
The cementing material comprises the following raw materials in parts by weight: 20-90
parts of slag, 5- 60 parts of circulating fluidized bed incineration fly ash and 6-15 parts of
desulfurized gypsum.
Furthermore, the cementing material comprises the following raw materials in parts by
weight: 65-70 parts of slag, 5-20 parts of circulating fluidized bed incineration fly ash and
-12 parts of desulfurized gypsum.
Furthermore, the circulating fluidized bed incineration fly ash comprises the following
components in parts by weight: 25-30 parts of CaO, 3-5 parts of Cl, 25-30 parts of SiO2,
-18 parts of A1203, 2-5 parts of K20, 3-5 parts of MgO, 2-4 parts of Na20, 5-8 parts of
Fe203,5-8 parts of S03 and 2-4 parts of P205.
Furthermore, the slag is water-quenched blast furnace slag and comprises the following
components in parts by weight: 40-45 parts of CaO, 26-28 parts of SiO2, 14-16 parts of
A1203, 9-11 parts of MgO, 1-2 parts of Fe203 and 2-4 parts of S03.
Further, the desulfurized gypsum comprises the following components in parts by weight:
-50 parts of CaO, 2-3 parts of SiO2, 0-1 part of A1203, 1-2 parts of MgO, 40-45 parts of
S03 and 0-1 part of Cl.
Further, the specific surface area of the slag is >500m 2/kg.
Further, the specific surface area of the desulfurized gypsum is > 400m 2 /kg.
Further, the iron tailings comprise the following components in parts by weight: 50-60
parts of SiO2, 10-15 parts of CaO, 8-10 parts of A1203, 8-10 parts of Fe203, 4-6 parts of
MgO, 2-4 parts of Na20, 1-3 parts of So 3 , 1-2 parts of K20, 0-1 parts of SiO 2 and 0-1 pats of P205.
In a second aspect of the present invention, there is provided a preparation method of the
cementitious backfill materials, comprising:
The raw materials are weighed according to parts by weight, and all the raw materials are
uniformly mixed with water according to the slurry concentration of 80-85%, thus
obtaining the cementing backfill materials.
Further, the preparation method further comprises drying the raw materials before
weighing the raw materials.
Furthermore, the preparation method also comprises the following steps: respectively
grinding the slag and the desulfurized gypsum so that the specific surface area of the slag
is more than >500m2 /kg, and the specific surface area of the desulfurized gypsum is
more than >400m 2/kg.
By grinding, the surface area of raw materials can be increased, on the one hand, the
activity of slag and gypsum can be stimulated, the hydration difficulty can be reduced,
and on the other hand, the uniformity of materials can be improved.
According to a third aspect of the present invention, an application of the cemented
backfill materials in cemented filling mining is provided.
The inventor is deeply involved in this field,With the rapid development of circulating
fluidized bed boiler technology in China in recent years, the inventor is keenly aware that
the content of chlorine and sulfur in the fly ash of circulating fluidized bed incineration is
low, and the emission concentration of dioxin-like substances is far below the national
pollutant emission limit. Using metallurgical slag to co-solidify circulating fluidized bed
incineration fly ash for cemented filling mining technology can not only provide a new opportunity for the treatment of incineration fly ash, but also significantly reduce the cost of cemented filling mining technology, and achieve a win-win situation of treating with and green filling.
Compared with the prior art, the invention has the following advantages:
(1) The cementing backfill materials of the present invention uses circulating fluidized
bed incineration fly ash as one of the raw materials, and the circulating fluidized bed
incineration technology has good flue gas emission performance, which can curb the
generation of dioxin and ensure that the emission of NOx, sulfide and acid gas meets the
environmental protection requirements; The content of chlorine and sulfur in fly ash is
lower than that produced by other incineration technologies. According to the invention,
coordinated resource utilization of incineration fly ash is realized, smelting slag generated
in the smelting process of non-ferrous metals is safely and effectively utilized, and the
comprehensive resource utilization and safe disposal of high heavy metal hazardous are
facilitated.
(2) The cemented backfill materials provided by the invention has good filling
performance, including rheological property, setting time, fluidity and higher
compressive strength, and its compressive strength can meet the compressive strength
(iMpa) of filling goaf, so it can be used as mining backfill materials and is a good
substitute for cement.
(3) The cementing backfill materials provided by the invention has excellent leaching
safety, and after long-term maintenance, the leaching concentration of various heavy
metal ions and soluble salts (Cl-, SO4-) is lower than the underground Class III water
quality standard.
(4) The cementing backfill materials provided by the invention has low cost, simple
preparation method, strong practicability and good engineering application prospect.
DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below.
It should be understood that the present disclosure may be embodied in various forms and
should not be limited by the embodiments set forth herein. On the contrary, these
embodiments are provided to be more thorough. Understand this disclosure clearly and
fully convey the scope of this disclosure to those skilled in the art. The reagents or
instruments used are conventional products that can be obtained through commercial
purchase, and the chemical compositions of some raw materials used are analyzed as
follows:
The chemical composition of circulating fluidized bed incineration fly ash, water
quenched blast furnace slag, desulfurized gypsum, P-0 42.5 cement, and iron tailings are
shown in Table 1. The detection method is X-ray fluorescence spectroscopy (XRF).
XRF-1800 X-ray fluorescence spectrometer measures secondary X-rays for material
composition analysis.Chemical group of circulating fluidized bed incineration fly ash,
water quenched blast furnace slag, desulfurized gypsum, P-0 42.5 cement and iron
tailings
CaO Cl Na20 K2 0 SO 3 SiO2 MgO A1 2 0 3 Fe203 ZnO P2 0 5 Cr20 3 PbO Element /00
Fly ash of circulati 27.24 3.38 2.28 2.54 6.38 28.31 3.82 15.04 5.95 0.53 2.58 0.04 0.05 ng fluidized bed
Slag 46.54 0.02 0.45 0.41 0.36 29.78 6.00 12.18 1.22 - - 0.02 Desulfur 0.33 0 16 37.4 2.07 1.10 1.03 000 izd 3.7 8 0.027 374 202.0 10 0.332 *6 0.02 3 03 0.003 gypsum P0 42.5 63.52 0.05 0.134 1.00 2.56 20.26 2.85 5.04 3.56 0.01 0.08 0.02 cement
tailings 12.27 - 2.24 1.99 2.02 55.64 5.32 9.66 9.41 - 0.25
Table 1 Raw Material Analysis
The leaching concentrations of heavy metal ions and soluble salts (Cl-, SO 42 -) in the fly
ash from circulating fluidized bed incineration are shown in Table 2. The leaching
concentrations of most heavy metals in the leachate of raw materials of circulating
fluidized bed incineration fly ash are low, but the leaching concentrations of heavy metals
2 Cr, As and Cu and soluble salts (Cl-, SO 4 -) all exceed the underground Class III water
quality standards.
Table 2 Leaching Concentration of Heavy Metals and Soluble Salts from Fly Ash of circulating
fluidized Bed Waste Incineration (mg/L)
SO42 Element Cr Hg Cu Zn As Cd Sb Pb Cl- Fly ash 0.100 <0.001 0.170 0.003 0.013 <0.001 <0.001 <0.001 1550 780 Undergroun d Class III water quality standard 0.050 0.010 0.01 1.000 0.010 0.005 0.005 0.01 250 250 Embodiment 1
A cementing backfill materials comprises the following raw materials in parts by mass:
83 parts of water quenched blast furnace slag, 5 parts of circulating fluidized bed
incineration fly ash, 12 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 2
A cementing backfill materials comprises the following raw materials in parts by mass:
68 parts of water quenched blast furnace slag, 20 parts of circulating fluidized bed
incineration fly ash, 12 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 3
A cementing backfill materials comprises the following raw materials in parts by mass:
48 parts of water quenched blast furnace slag, 40 parts of circulating fluidized bed
incineration fly ash, 12 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 4
A cementing backfill materials comprises the following raw materials in parts by mass:
28 parts of water quenched blast furnace slag, 60 parts of circulating fluidized bed
incineration fly ash, 12 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 5
A cementing backfill materials comprises the following raw materials in parts by mass:
74 parts of water quenched blast furnace slag, 20 parts of circulating fluidized bed
incineration fly ash, 6 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 6
A cementing backfill materials comprises the following raw materials in parts by mass:
72 parts of water quenched blast furnace slag, 20 parts of circulating fluidized bed
incineration fly ash, 8 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 7
A cementing backfill materials comprises the following raw materials in parts by mass:
72 parts of water quenched blast furnace slag, 18 parts of circulating fluidized bed
incineration fly ash, 10 parts of desulfurized gypsum and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Embodiment 8
A cementing backfill materials comprises the following raw materials in parts by mass:
72 parts of water quenched blast furnace slag, 20 parts of circulating fluidized bed
incineration fly ash, 14 parts of desulfurized gypsum and 424 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Drying the required raw materials, and weighing the raw materials according to the above
parts by weight; Grinding slag and desulfurized gypsum, make the specific surface area
of slag >500m 2 /kg and desulfurization gypsum >400m 2/kg; According to the slurry
concentration of 82%, all raw materials are mixed with water evenly, and the cementing
backfill materials is prepared.
Comparative embodiment 1
A backfill materials comprises the following raw materials in parts by mass:
100 parts of P-O 42.5 cement and 400 parts of iron tailings.
The preparation method of the cementing backfill materials comprises the following
steps:
Weigh each raw material according to the above weight parts; according to the slurry
concentration of 82%, all the raw materials and water are mixed uniformly, that is, the
backfill materials is prepared.
Comparative embodiment 2
A backfill materials comprises the following raw materials in parts by mass:
P-0 42.5 cement 80 parts, circulating fluidized bed incineration fly ash 20 parts, iron
tailings 400 parts.
The preparation method of the cementing backfill materials comprises the following
steps:
Weigh the raw materials according to the above parts by weight; According to the slurry
concentration of 82%, all the raw materials are mixed with water evenly to prepare the
backfill materials.
Comparative embodiment 3
A backfill materials comprises the following raw materials in parts by mass:
P-0 42.5 cement 60 parts, circulating fluidized bed incineration fly ash 40 parts, iron
tailings 400 parts.
The preparation method of the cementing backfill materials comprises the following
steps:
Weigh the raw materials according to the above parts by weight; According to the slurry
concentration of 82%, all the raw materials are mixed with water evenly to prepare the
backfill materials.
Comparative embodiment 4
A backfill materials comprises the following raw materials in parts by mass:
P-0 42.5 cement 40 parts, circulating fluidized bed incineration fly ash 60 parts, iron
tailings 400 parts.
The preparation method of the cementing backfill materials comprises the following
steps:
Weigh the raw materials according to the above parts by weight; According to the slurry
concentration of 82%, all the raw materials are mixed with water evenly to prepare the
backfill materials.
Experimental embodiment
The fluidity, setting time and rheological properties of fresh backfill materials slurry
prepared in Embodiments 1-8 and Comparative Embodiments 1-4 were tested, and the
test results of Embodiments 1-4 and Comparative Embodiments 1-4 are shown in Table
3,According to GB17671-1999 "Test methodfor strength of cement mortar", fill samples
were prepared respectively, and the sample size was 40mmx40mmx160mm, which were
cured under the standard conditions of temperature 35°C and humidity above 95%,the
compressive strength of mortar test blocks at different curing ages was measured
according to GB/T 5486, and the test results are shown in table 4. The horizontal shock
toxicity leaching experiments were carried out on the blocks cured at different ages, and
the leaching amounts of major heavy metals and soluble salts (Cl-, SO42-) were measured.
The test results are shown in Tables 5 and 6.
Table 3 Fluidity, Setting Time And Rheological Properties Of Filling Slurry At Different Times Fluidity/mm Setting Time/h stess/Pa Plastic viscosity/Pa-S Embodiment 1 225 9.8 162.21 0.62 Embodiment 2 238 21.2 136.34 0.46 Embodiment 3 230 22 138.98 0.52 Embodiment 4 220 21.5 160.76 0.75
Experimental 220 4.5 170.45 0.58 embodiment 1 Experimental 245 13.5 143.21 0.42 embodiment 2 Experimental 225 14 138.73 0.56 embodiment 3 Experimental 215 12.8 153.34 1.08 embodiment 4
Table 3 Compressive Strength Of Filling Test Block Embodiment 3d 7d 28d Embodiment 1 1.73±0.09 14.39±0.72 18.24+0.91 Embodiment 2 7.75±0.39 12.84±0.64 25.36±1.27 Embodiment 3 5.42±0.27 12.51±0.63 14.84±0.74 Embodiment 4 3.03+0.15 5.57±0.28 6.45±0.32 Embodiment 5 5.00+0.25 8.71+0.44 15.38±0.77 Embodiment 6 4.51 0.23 10.04±0.50 16.20±0.81 Embodiment 7 5.53 0.28 12.95±0.65 16.35±0.82 Embodiment 8 4.43 0.22 16.04±0.80 18.83+0.94 Comparative 15.12+0.76 21.18+1.06 29.39+1.47 embodiment1I
11.07+0.55 18.11+0.91 29.39+1.47 embdarativ
6.42+0.32 9.73+0.49 25.06+1.25 embodiment3
3.08+0.15 5.80+0.29 20.36+1.02 embiparate4 Table 5 Leaching concentration (mg/L) of heavy metals and soluble salts in different ages of filling test blocks in Examples 1-8 Age Embodiment Cr As Cu Cl- SO42
Fly ash of of circulating 0.100 0.013 0.170 fluidized bed 1550 780 3d 0.005 ND ND 71.40 249.25 7d 2 0.004 ND 0.005 67.44 168.34 28d 0.002 0.001 0.007 68.38 122.56 3d 0.005 ND ND 129.73 217.06 7d 3 0.004 ND 0.011 127.52 141.07 28d 0.004 0.004 0.026 191.14 118.86 3d 0.008 0.001 0.007 188.38 259.62 4 7d 0.010 ND 0.025 185.65 236.43
28d 0.007 0.003 0.038 243.50 178.83 3d ND ND 0.005 145.23 282.94 7d 5 ND 0.001 0.008 113.69 225.93 28d 0.005 0.004 0.010 122.20 183.67 3d ND ND 0.004 122.56 220.49 7d 6 ND ND 0.005 106.90 186.43 28d 0.004 0.002 0.008 116.96 154.89 3d ND ND 0.004 116.96 201.76 7d 7 ND ND 0.004 96.75 179.01 28d 0.002 0.002 0.006 101.26 136.85 3d ND ND 0.001 86.43 141.52 7d 8 ND ND 0.003 72.55 125.81 28d 0.003 0.001 0.005 69.75 91.14 Drinking water standard 0.050 0.010 0.01 300 300 Note: ND means lower than the instrument detection limit.
Table 6 Leaching Concentration of Heavy Metals and Soluble Salts in Different Ages of Filling Test Blocks of Comparative Embodiments 1-4 (mg/L)
ECmparative Cr As Cu Cl- SO42 Age Fly ash of of circulating fluidized 0.100 0.013 0.170 bed 1550 780 3d 0.003 ND ND 73.01 40.37 7d 1 0.004 ND ND 68.55 25.68 28d 0.008 0.001 0.001 62.40 16.34 3d 0.004 ND ND 137.86 123.67 7d 2 0.008 0.001 0.008 126.90 122.56 28d 0.010 0.002 0.012 111.40 157.35 3d 0.010 0.001 0.005 206.89 242.94 7d 3 0.014 0.003 0.036 258.56 258.19 28d 0.020 0.005 0.050 272.90 293.46 3d 0.012 0.004 0.021 489.09 619.48 7d 4 0.018 0.004 0.034 549.76 754.50 28d 0.023 0.006 0.043 683.26 869.00 Underground class III 0.050 0.010 0.01 300 300 water quality standard Note: ND means lower than the instrument detection limit.
The cemented backfill materials provided by the present invention has good filling
properties, including rheological properties, setting time, fluidity, and higher compressive
strength (especially the best cemented backfill materials of embodiment 2, which has unexpectedly high compressive strength 25.36Mpa), which can be used in places with different strength requirements in the goaf (the surface strength of the filling body to ensure the normal walking of the self-propelled equipment is 1-2Mpa, and the strength of the filling body as an artificial bottom column and artificial roof is 4-5Mpa). In addition, the cemented backfill materials provided by the present invention also has excellent leaching safety, and the leaching concentration of heavy metal ions and soluble salts (Cl and S042-) is lower than the drinking water sanitary standard, and at the same time meets the groundwater Class III standard.
The cementing backfill materials provided by the present invention is superior to the pure
cement-based system in terms of rheological properties, setting time, fluidity and
leaching concentration of heavy metals and soluble salts (Comparative Embodiments l
4).
The above is only a preferred embodiment of the present invention, but the protection
scope of the present invention is not limited to this,Any change or substitution that can be
easily thought of by any person familiar with the technical field within the technical
scope disclosed by the present invention should be covered within the protection scope of
the present invention. Therefore, the protection scope of the present invention shall be
subject to the protection scope of the claims.

Claims (10)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:
1. A cementing backfill materials containing circulating fluidized bed incineration fly ash,
characterized in that the cementing backfill materials comprises a cementing material and
iron tailings, and the mass ratio of the cementing material to the iron tailings is 1:4;
The cementing material comprises the following raw materials in parts by weight: 20-90
parts of slag, 5-60 parts of circulating fluidized bed incineration fly ash and 6-15 parts of
desulfurized gypsum.
2. The cementing backfill materials according to claim 1, characterized in that the
cementing material comprises the following raw materials in parts by weight: 65-70 parts
of slag, 5-20 parts of circulating fluidized bed incineration fly ash and 10-12 parts of
desulfurized gypsum.
3. The cementing backfill materials according to claim 1, characterized in that the
circulating fluidized bed incineration fly ash comprises the following components in parts
by weight: 25-30 parts of CaO, 3-5 parts of Cl, 25-30 partsof Si2, 15-18 parts of A1203,
2-5 parts of K20, 3-5 parts of MgO, 2-4 parts of Na20, 5-8 parts of Fe203, 5-8 parts of
S03 and 2-4 parts of P2 05 .
4. The cementing backfill materials according to claim 1, characterized in that the slag is
water-quenched blast furnace slag and comprises the following components in parts by
weight: 40-45 parts of CaO, 26-28 parts of SiO2, 14-16 parts of A1203, 9-11 parts of MgO,
1-2 parts of Fe203, 2-4 parts of S03;
Preferably, the specific surface area of the slag is more than >500m 2/kg.
5. The cementing backfill materials according to claim 1, characterized in that the
desulfurized gypsum comprises the following components in parts by weight: 45-50 parts of CaO, 2-3 parts of SiO2, 0-1 part of A1203, 1-2 parts of MgO, 40-45 parts of S03 and 0
1 part of Cl;
Preferably, the specific surface area of the desulfurized gypsum is more than 400m 2 /kg.
6. The cemented backfill materials according to claim 1, characterized in that the iron
tailings comprise the following components in parts by weight: 50-60 parts of SiO2, 10
parts of CaO, 8-10 parts of A1203, 8-10 parts of Fe203, 4-6 parts of MgO, 2-4 parts of
Na20, 1-3 parts of S03, 1-2 parts of K20, 0-1 parts of SiO 2 and 0-1 parts of P2 05
.
7. The preparation method of cementing backfill materials according to any one of claims
1-6, characterized in that the preparation method comprises:
The raw materials are weighed according to parts by weight, and all the raw materials are
uniformly mixed with water according to the slurry concentration of 80-85%, thus
obtaining the cementing backfill materials.
8. The preparation method according to claim 7, further comprising drying the raw
materials before weighing them.
9. The preparation method according to claim 7, further comprising grinding the slag and
the desulfurized gypsum to make the specific surface area of the slag > 500 m 2 /kg and the
specific surface area of the desulfurized gypsum >400m 2/kg.
10. The application of the cemented backfill materials as claimed in any one of claims 1
6 in cemented filling mining.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113816623A (en) * 2021-09-30 2021-12-21 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 Cementitious material, composite filler material, concrete and filler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113816623A (en) * 2021-09-30 2021-12-21 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 Cementitious material, composite filler material, concrete and filler

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