CN111302680B - Recycling method of fine-grained tailing sand - Google Patents
Recycling method of fine-grained tailing sand Download PDFInfo
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- CN111302680B CN111302680B CN202010156485.9A CN202010156485A CN111302680B CN 111302680 B CN111302680 B CN 111302680B CN 202010156485 A CN202010156485 A CN 202010156485A CN 111302680 B CN111302680 B CN 111302680B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention provides a recycling method of fine-grained tailing sand, which is characterized in that the tailing sand, clay and limestone are used as raw materials to produce cement clinker for roads, a correlation rule is established according to the components of the raw materials and the change conditions of compounds generated before and after chemical reaction, based on the correlation rule, the blending proportion of the raw materials is accurately calculated, the performance and the quality of cement are controlled through parameter adjustment, the fine-grained tailing sand is selected, the grinding process is reduced, and the compatibility among the components is better. The invention fully utilizes the component advantages of the iron tailings, the delayed coagulation effect of the phosphogypsum and the later strength of the cement reinforced by the fly ash, ensures better performance in road engineering, simultaneously utilizes the solid waste tailings to the maximum extent, promotes the resource recycling and high-efficiency utilization of the tailing sand, and makes the wastes recycled, the resources highly efficient and the achievements environmentally friendly.
Description
Technical Field
The invention relates to a recycling method of solid waste, in particular to a recycling method of fine-grained tailing sand.
Technical background:
the tailings sand is solid waste discharged after useful components in ores are extracted by a concentrating mill, according to statistics, the total quantity of the tailings stockpiled nationwide exceeds 600 hundred million tons, and the tailings are increased at a remarkable speed of 16 hundred million tons every year, at present, the tailings are mainly utilized by preparing sintered bricks and steam bricks and backfilling goafs, and the annual utilization rate is only 18.9%. The main treatment mode of a large amount of tailings which are not utilized is stacking, which not only forces enterprises to construct tailing ponds to bear high capital construction cost, but also occupies precious land resources and causes huge challenges to the environment.
The cement is used as the most commonly used consumable in the civil engineering and transportation industry, almost every project construction can not be distinguished from the cement, generally speaking, raw materials for cement production generally comprise limestone, clay, stone powder, slag and the like, the raw materials are calcined according to a certain proportion according to cement components to obtain cement clinker, the national cement production amount in 2018 reaches 22.12 hundred million tons, the consumption of the raw materials in the cement production is huge in the scale, when the usage amount of stone mining and land is large, at present, under the most strict environmental protection policy, the sand mining and utilization cost is high, and the environment is seriously damaged.
The tailings sand needs to be solved urgently, the cement production has vigorous requirements on raw materials, most of the tailings sand components are compounds required for calcining cement, the tailings sand has the potential of serving as raw materials for cement production, the tailings sand particles are fine, compared with natural stones, extra grinding is not needed, the tailings sand has good compatibility with other raw materials of cement, and the production cost can be reduced. Therefore, in order to effectively recycle the tailings sand with high value, a favorable method for recycling the tailings sand with fine granularity as cement is provided.
The invention content is as follows:
the invention aims to solve the technical problem of providing the road cement which is beneficial to producing the tailing sand with fine granularity and realizes the benefit of recycling the tailing sand.
The technical problem of the invention is that the following technical scheme is adopted:
a method for recycling fine-grained tailing sand comprises the steps of grinding iron tailing sand, limestone and clay into powder, drying, calcining to obtain cement clinker, and preparing road cement according to the cement clinker 80-90%, phosphogypsum 5-10% and fly ash 5-10%, wherein the mixing proportion of the iron tailing sand, the clay and the limestone in the cement clinker is determined according to the following method:
mt+mn+ms=100
α=at×mt+an×mn+as×ms—2.8×（bt×mt+bn×mn+bs×ms）—1.65×（ct×mt+ cn×mn+cs×ms）—0.35×（dt×mt+ dn×mn+ ds×ms）
β=（bt×mt+bn×mn+bs×ms）/（ct×mt+ cn×mn+cs×ms+dt×mt+ dn×mn+ ds×ms）
in the formula:
mt is the content of iron tailing sand; mn is the clay content; ms is the content of limestone;
at is the content of calcium oxide in the iron tailing sand; an is the content of calcium oxide in the clay;
as is the content of calcium oxide in limestone; bt is the content of silicon oxide in the iron tailings;
bn is the content of silica in the clay; bs is the content of silicon oxide in limestone;
ct is the content of aluminum oxide in the iron tailings; cn is the content of alumina in the clay;
cs is the content of alumina in the limestone; dt is the content of iron oxide in the iron tailing sand;
dn is the content of ferric oxide in the iron tailing sand; ds is the content of iron oxide in the iron tailings sand;
alpha is free calcium oxide content, and is required to be less than 1; beta is the silicon rate of the cement clinker, and is 1.7-2.7.
The road cement contains 15-20% of tetracalcium aluminoferrite and less than 7% of calcium aluminate, and when the tetracalcium aluminoferrite and the calcium aluminate do not meet the requirements, the numerical values of the coefficients alpha and beta are adjusted according to the calculation formula, and the blending ratio of the raw materials is recalculated.
Preferably, the content alpha of free calcium oxide after the reaction and the silicon percentage are calculated according to the chemical reaction of iron tailings, clay and limestone to generate the main components of cement, namely 3 CaO. SiO2, 3 CaO. Al2O3 and CaO. Fe2O3, and 1.65mol of Al2O3, 0.35 mol of Fe2O3 and 2.8mol of SiO2 are needed for 1mol of calcium oxide reaction according to the molar mass proportion of elements.
Preferably, the content of the phosphogypsum is less than 0.075mm and more than 60%, and the fine-grained tailings are iron tailings with the grain size of less than 0.075mm and more than 65%.
Preferably, the content of calcium oxide in the iron tailings is more than 35%, the content of silicon oxide is 20-30%, the content of ferric oxide is 8-15%, the content of aluminum oxide is less than 5%, the content of silicon oxide in the clay is 50-60%, the content of ferric oxide is less than 4%, the content of aluminum oxide is 20-30%, the content of calcium oxide in the limestone is more than 55%, the content of silicon oxide is less than 3%, the content of ferric oxide is less than 3%, and the content of aluminum oxide is less than 3%.
The invention has the beneficial effects that:
the invention adopts the tailing sand, the clay and the limestone to prepare the cement clinker, establishes a correlation rule according to the raw materials and the constituent components of the lime compound and the change condition of the generated compound before and after the chemical reaction, calculates the mixing proportion of the raw materials based on the correlation rule, increases the mixing proportion of the tailing sand through parameter adjustment, and controls the cement performance.
The invention adopts the tailing sand with fine granularity as the cement raw material, reduces the grinding procedure compared with slag and broken stone, has better compatibility among all components, simplifies the cement production flow and reduces the cost.
The invention mixes the cement clinker prepared by fine-grained tailing sand with the phosphogypsum and the fly ash, fully utilizes the advantages of the iron tailing components, the delayed coagulation effect of the phosphogypsum and the later strength of the fly ash reinforced cement when producing the cement for roads, ensures that the cement has better performance in the use of road engineering, and utilizes the solid waste tailings to the maximum extent.
The invention provides a recycling method of solid waste tailing sand, which uses industrial waste tailing sand as a raw material for producing road cement, respectively uses fine-grained iron tailing sand as cement clinker according to the components and characteristics of the tailing sand, and then prepares the road cement together with phosphogypsum and fly ash, thereby exerting respective performance advantages and realizing the recycling and high-efficiency utilization of waste.
The specific embodiment is as follows:
in order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
Example 1: the invention selects iron tailing sand and phosphogypsum to prepare the road cement, wherein the maximum grain size of the iron tailing sand is 1.18mm, the content of the iron tailing sand is 69 percent below the grain size of 0.075mm, the maximum grain size of the phosphogypsum is 0.3mm, the content of the phosphogypsum is 64 percent below the grain size of 0.075mm, and the content of the phosphogypsum is 10 percent below the grain size of 0.005 mm.
Selecting iron tailings sand, clay and limestone as raw materials for producing cement clinker, and analyzing the components of the iron tailings sand, the clay and the limestone by adopting a spectrophotometer and a plasma mass spectrometer, wherein the results are shown in the following table:
according to the contents of compounds in iron tailing sand, clay and limestone, the mixing proportion of raw materials in the cement clinker is determined according to the following method:
mt+mn+ms=100
α=at×mt+an×mn+as×ms—2.8×（bt×mt+bn×mn+bs×ms）—1.65×（ct×mt+ cn×mn+cs×ms）—0.35×（dt×mt+ dn×mn+ ds×ms）。
β=（bt×mt+bn×mn+bs×ms）/（ct×mt+ cn×mn+cs×ms+dt×mt+ dn×mn+ ds×ms）
in the formula:
mt is the content of iron tailing sand; mn is the clay content; ms is the content of limestone;
at is the content of calcium oxide in the iron tailing sand; an is the content of calcium oxide in the clay;
as is the content of calcium oxide in limestone; bt is the content of silicon oxide in the iron tailings;
bn is the content of silica in the clay; bs is the content of silicon oxide in limestone;
ct is the content of aluminum oxide in the iron tailings; cn is the content of alumina in the clay;
cs is the content of alumina in the limestone; dt is the content of iron oxide in the iron tailing sand;
dn is the content of ferric oxide in the iron tailing sand; ds is the content of iron oxide in the iron tailings sand;
according to the above equation, the value of alpha is 0, and the value of beta is 2.5, so as to obtain the following equation set:
mt+mn+ms=100
（0.25mt+0.5mn）/（0.035mt+0.25mn）=2.5
0.6ms-1.4mn-0.745mt=0
finally, calculating: mt =15, mn =20, ms = 60.
15 percent of iron tailing sand, 20 percent of clay and 65 percent of limestone are ground and dried together, and then are calcined to obtain cement clinker, and the cement clinker is prepared into the road cement according to 85 percent of cement clinker, 10 percent of phosphogypsum and 5 percent of fly ash. The cement for roads contains 17.2 percent of tetracalcium aluminoferrite and 4.7 percent of calcium aluminate, and meets the requirements.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A method for recycling fine-grained tailing sand is characterized by comprising the following steps: iron tailing sand, limestone and clay are ground and dried together, then calcined to obtain cement clinker, the cement clinker is prepared into road cement according to the cement clinker 80-90%, phosphogypsum 5-10% and fly ash 5-10%, and the mixing proportion of the iron tailing sand, the clay and the limestone in the cement clinker is determined according to the following method:
mt+mn+ms=100
α=at×mt+an×mn+as×ms—2.8×（bt×mt+bn×mn+bs×ms）—1.65×（ct×mt+ cn×mn+cs×ms）—0.35×（dt×mt+ dn×mn+ ds×ms）
β=（bt×mt+bn×mn+bs×ms）/（ct×mt+ cn×mn+cs×ms+dt×mt+ dn×mn+ ds×ms）
in the formula:
mt is the content of iron tailing sand; mn is the clay content; ms is the content of limestone;
at is the content of calcium oxide in the iron tailing sand; an is the content of calcium oxide in the clay;
as is the content of calcium oxide in limestone; bt is the content of silicon oxide in the iron tailings;
bn is the content of silica in the clay; bs is the content of silicon oxide in limestone;
ct is the content of aluminum oxide in the iron tailings; cn is the content of alumina in the clay;
cs is the content of alumina in the limestone; dt is the content of iron oxide in the iron tailing sand;
dn is the content of ferric oxide in the iron tailing sand; ds is the content of iron oxide in the iron tailings sand;
alpha is free calcium oxide content, and is required to be less than 1; beta is the silicon rate of the cement clinker, and 1.7-2.7 is taken;
the road cement contains 17-23% of tetracalcium aluminoferrite and less than 9% of calcium aluminate, and when the tetracalcium aluminoferrite and the calcium aluminate do not meet the requirements, the numerical values of the coefficients alpha and beta are adjusted according to the calculation formula, and the blending ratio of the raw materials is recalculated.
2. The method for recycling the fine-grained tailings according to claim 1, wherein the phosphogypsum has a grain size of less than 0.075mm and a content of more than 60%, and the fine-grained tailings are iron tailings with a grain size of less than 0.075mm and a content of more than 65%.
3. The method for recycling fine-grained tailings sand according to claim 1, wherein the iron tailings contain more than 35% of calcium oxide, 20-30% of silicon oxide, 8-15% of iron oxide and less than 5% of aluminum oxide, the clay contains 50-60% of silicon oxide, less than 4% of iron oxide and 20-30% of aluminum oxide, and the limestone contains more than 55% of calcium oxide, less than 3% of silicon oxide, less than 3% of iron oxide and less than 3% of aluminum oxide.
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| CN111302680B true CN111302680B (en) | 2021-11-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DK242077A (en) * | 1976-08-20 | 1978-02-21 | Tashk Ni | RAW MIXTURE FOR THE MANUFACTURE OF CEMENT CLINKS |
| CN103373826B (en) * | 2012-04-19 | 2016-03-23 | 北京建筑材料科学研究总院有限公司 | A kind of method utilizing iron tailings to prepare low-carbon cement clinker |
| CN102718419A (en) * | 2012-06-29 | 2012-10-10 | 酒钢(集团)宏达建材有限责任公司 | Method for producing portland cement for road by blending iron ore beneficiation tailings in cement |
| CN105541143B (en) * | 2016-01-19 | 2018-12-04 | 北京建筑材料科学研究总院有限公司 | A method of utilizing dry-process rotory kiln system production high strength low-carbon clinker |
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