CN111848079B - High-plasticity cement product doped with iron ore concentrate powder and preparation method thereof - Google Patents
High-plasticity cement product doped with iron ore concentrate powder and preparation method thereof Download PDFInfo
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- CN111848079B CN111848079B CN202010619076.8A CN202010619076A CN111848079B CN 111848079 B CN111848079 B CN 111848079B CN 202010619076 A CN202010619076 A CN 202010619076A CN 111848079 B CN111848079 B CN 111848079B
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions 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
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a high-plasticity cement product doped with iron ore tailings powder and a preparation method thereof, wherein the material comprises the following components in parts by mass: kiln dust: 12-18 parts; gypsum: 15-20 parts of a solvent; chalk: 20-35 parts; clay: 40-55 parts; correction materials: 4-8 parts; iron tailings: 10-12 parts; high-strength fibers: 6-12 parts; ceramic micro powder: 7-15 parts; grinding aid: 1-2 parts. The material can fully exert the gelling and filling effects of the nonmetal phases in the iron ore dressing tailing powder in the building material products, and promote the high added value utilization of the iron ore dressing tailing powder; meanwhile, the high-plasticity cement product overcomes the problems of low tensile strength, deviation of deformation resistance, easy cracking, easy brittle failure and the like of most of the existing cement products; the heat-insulating material has the advantages of good ductility, crack resistance, impermeability and the like, and also has excellent heat-insulating property due to the special preparation method.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-plasticity cement product doped with iron ore concentrate powder and a preparation method thereof.
Background
With the rapid development of industrialization and the gradual increase of mining scale in China, the accumulation amount of mine tailings is increased day by day. According to incomplete statistics, about 7 hundred million tons of iron ore dressing tailings are stockpiled and disposed every year in China at present. The iron ore dressing tailings piled up in large quantity not only occupy the land, but also easily cause the problems of environmental pollution and the like. Therefore, relevant departments and acquaintances in China already develop a great deal of research work on the comprehensive utilization of the iron tailings. At present, the technology of iron ore dressing tailings in the field of building materials is mainly used for producing building material raw materials and products, such as building sand, concrete fine aggregate, building blocks, baking-free bricks and the like. Most of the technologies have the problems of low added value, limited raw materials from production places to market users, and the like, so that the utilization rate of iron tailings in China is still in a low state at present.
In order to fully play the role of non-metal phases in the iron ore tailings powder in building material products, promote the high added value utilization of the iron ore tailings powder and improve the utilization rate of the iron ore tailings powder, the invention mainly uses the iron ore tailings powder for a high-plasticity cement product. The high-plasticity cement product overcomes the problems of low tensile strength, deviation of deformation resistance, easy cracking, easy brittle failure and the like of most of the existing cement products; the heat-insulating material has the advantages of good ductility, crack resistance, impermeability and the like, and also has excellent heat-insulating property due to the special preparation method.
Disclosure of Invention
The invention aims to provide a high-plasticity cement product doped with iron ore tailings powder and a preparation method thereof, wherein the cement product is green and environment-friendly, and has the advantages of high ductility, excellent anti-cracking and anti-permeability performance, heat preservation performance and the like.
In order to achieve the above purpose, the solution of the invention is:
a high-plasticity cement product doped with iron ore tailings powder comprises the following components in parts by mass: kiln dust: 12-18 parts; gypsum: 15-20 parts of a solvent; chalk: 20-35 parts; clay: 40-55 parts; correction materials: 4-8 parts; iron tailings: 10-12 parts; high-strength fibers: 6-12 parts; ceramic micro powder: 7-15 parts; grinding aid: 1-2 parts.
The screen residue of the kiln dust with the aperture of 0.08mm is less than 15 percent.
The gypsum is dihydrate gypsum.
The chalk is in the form of block.
The correcting material is diatomite, bauxite or siltstone.
The iron tailings are in a powder state.
The high-strength fiber adopts concrete companion fiber.
The grinding aid is a powdery compound.
The preparation method of the high-plasticity cement product doped with the iron ore concentrate powder comprises the following steps:
step 1, mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-25 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1-2%;
step 2, feeding the prepared dried mixed raw material and grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is less than 10mm, and then performing pre-homogenization treatment on the mixed powder in a 'flat-laying and straight-taking' mode;
step 3, feeding the homogenized mixed powder into a calcining kiln at the temperature of 1300-1500 ℃ for high-temperature calcination for 1-2 h, and taking out of the kiln for quenching to obtain clinker;
step 4, firstly spraying ceramic micro powder on the surface of the high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the clinker prepared in the step 3, and fully mixing and stirring to prepare a plastic mixture;
and 5, filling the plastic mixture into a mold, pressing into sections, and curing at the temperature of 30-35 ℃ to obtain the high-plasticity cement product.
After the scheme is adopted, the invention has the following beneficial effects:
(1) the invention fully exerts the gelation and filling functions of the nonmetal phases in the iron tailing powder in the high-plasticity cement product, and promotes the high added value utilization of the iron tailing powder;
(2) by adopting the high-strength fiber optimization process, the prepared high-plasticity cement product overcomes the problems of low tensile strength, deformation resistance deviation, easy cracking, easy brittle failure and the like of most cement products; has better ductility, anti-cracking and anti-permeability and the like;
(3) the added ceramic micro powder has the function of emitting infrared rays, and can reflect the infrared rays generated by the sun to the cement product, so that the temperature of the cement product is increased by 3-6 ℃, and the prepared cement product can be used as a sunlight heat storage material and has an excellent heat preservation effect.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a high-plasticity cement product doped with iron ore tailings powder, which comprises the following components in parts by mass: kiln dust: 18 parts of a mixture; dihydrate gypsum: 17 parts of (1); chalk: 30 parts of (1); clay: 55 parts of (1); diatomite: 4 parts of a mixture; iron tailings: 12 parts of (1); concrete companion fiber: 8 parts of a mixture; ceramic micro powder: 12 parts of (1); grinding aid: 1 part.
The preparation method of the high-plasticity cement product doped with the iron ore concentrate powder comprises the following steps:
(1) mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-22 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1-1.5%;
(2) and (3) feeding the prepared dried mixed raw material and the grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is controlled to be less than 10 mm. Then, pre-homogenizing the mixed powder in a 'flat spreading and direct taking' mode;
(3) sending the homogenized mixed powder into a calcining kiln at the temperature of 1350 ℃ for high-temperature calcination for 1h, and taking out of the kiln for quenching to obtain clinker;
(4) firstly, spraying ceramic micro powder on the surface of high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the prepared clinker, and fully mixing and stirring to prepare a plastic mixture;
(5) and filling the plastic mixture into a mold, pressing into sections, and maintaining at the temperature of 30 ℃ to obtain the high-plasticity cement product.
Example 2
The embodiment provides a high-plasticity cement product doped with iron ore tailings powder, which comprises the following components in parts by mass: kiln dust: 12 parts of (1); dihydrate gypsum: 20 parts of (1); chalk: 35 parts of (B); clay: 40 parts of a mixture; bauxite: 7 parts; iron tailings: 11 parts of (1); concrete companion fiber: 12 parts of (1); ceramic micro powder: 15 parts of (1); grinding aid: and 2 parts.
The preparation method of the high-plasticity cement product doped with the iron ore concentrate powder comprises the following steps:
(1) mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-24 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1-1.8%;
(2) and (3) feeding the prepared dried mixed raw material and the grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is controlled to be less than 10 mm. Then, pre-homogenizing the mixed powder in a 'flat spreading and direct taking' mode;
(3) sending the homogenized mixed powder into a calcining kiln at the temperature of 1400 ℃ for high-temperature calcination for 1.5h, and taking out of the kiln for quenching to obtain clinker;
(4) firstly, spraying ceramic micro powder on the surface of high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the prepared clinker, and fully mixing and stirring to prepare a plastic mixture;
(5) and filling the plastic mixture into a mould, pressing into sections, and curing at the temperature of 32 ℃ to obtain the high-plasticity cement product.
Example 3
The embodiment provides a high-plasticity cement product doped with iron ore tailings powder, which comprises the following components in parts by mass: kiln dust: 15 parts of (1); dihydrate gypsum: 15 parts of (1); chalk: 20 parts of (1); clay: 50 parts of a mixture; siltstone: 8 parts of a mixture; iron tailings: 10 parts of (A); concrete companion fiber: 6 parts of (1); ceramic micro powder: 7 parts; grinding aid: and 2 parts.
The preparation method of the high-plasticity cement product doped with the iron ore concentrate powder comprises the following steps:
(1) mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-25 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1.2-2%;
(2) and (3) feeding the prepared dried mixed raw material and the grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is controlled to be less than 10 mm. Then, pre-homogenizing the mixed powder in a 'flat spreading and direct taking' mode;
(3) sending the homogenized mixed powder into a calcining kiln at the temperature of 1500 ℃ for high-temperature calcination for 2 hours, and taking out of the kiln for quenching to obtain clinker;
(4) firstly, spraying ceramic micro powder on the surface of high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the prepared clinker, and fully mixing and stirring to prepare a plastic mixture;
(5) and filling the plastic mixture into a mold, pressing into sections, and maintaining at the temperature of 35 ℃ to obtain the high-plasticity cement product.
In examples 1 to 3, the unit of mass ratio is kg in parts by weight.
The properties of a high-plasticity cement product doped with the iron ore concentrate powder prepared in examples 1 to 3 were tested, and the test results are shown in table 1.
TABLE 1 Performance index of high-plasticity cement product doped with iron ore tailings powder
Note: the comparative example is a cement product made from ordinary portland cement.
As can be seen from the data in Table 1, the performance indexes of the high-plasticity cement products doped with the iron ore dressing tailings powder prepared in the embodiments 1-3 of the invention are obviously higher than those of the comparative examples, which shows that the high-plasticity cement products doped with the iron ore dressing tailings powder of the invention have better performances of ductility, crack resistance, permeability resistance and the like. In detail, in the high-plasticity cement product doped with the iron ore concentrate powder, the high-strength fiber optimization process is adopted, and the high-strength fiber presents a three-dimensional network structure in the product, so that the water precipitation phenomenon on the surface of the product can be reduced, the larger volume shrinkage caused by water loss on the surface of the product can be effectively prevented, and the product is prevented from cracking. In addition, the high-strength fiber can bear tensile stress generated by drying shrinkage in a cement structure in a plastic state, so that the generation and development of cracks in the product in the plastic state are reduced. The heat conductivity coefficient of the high-plasticity cement product is obviously lower than that of a comparative example, and the material has better heat insulation performance, because the added ceramic micro powder has the function of emitting infrared rays, the ceramic micro powder can reflect the infrared rays generated by the sun to the cement product, so that the temperature of the cement product is increased by 3-6 ℃, and the prepared cement product becomes a 'sunlight heat storage material'.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A high-plasticity cement product doped with iron ore concentrate powder is characterized in that: the composition comprises the following components in parts by mass: kiln dust: 12-18 parts; gypsum: 15-20 parts of a solvent; chalk: 20-35 parts; clay: 40-55 parts; correction materials: 4-8 parts; iron tailings: 10-12 parts; high-strength fibers: 6-12 parts; ceramic micro powder: 7-15 parts; grinding aid: 1-2 parts;
the preparation method comprises the following steps:
step 1, mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-25 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1-2%;
step 2, feeding the prepared dried mixed raw material and grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is less than 10mm, and then performing pre-homogenization treatment on the mixed powder in a 'flat-laying and straight-taking' mode;
step 3, feeding the homogenized mixed powder into a calcining kiln at the temperature of 1300-1500 ℃ for high-temperature calcination for 1-2 h, and taking out of the kiln for quenching to obtain clinker;
step 4, firstly spraying ceramic micro powder on the surface of the high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the clinker prepared in the step 3, and fully mixing and stirring to prepare a plastic mixture;
and 5, filling the plastic mixture into a mold, pressing into sections, and curing at the temperature of 30-35 ℃ to obtain the high-plasticity cement product.
2. The high-plasticity cement product doped with the iron ore dressing tailing powder as claimed in claim 1, wherein the 0.08mm pore size screen residue of the kiln dust is less than 15%.
3. The high-plasticity cement product doped with the iron ore concentrate powder as claimed in claim 1, wherein the gypsum is dihydrate gypsum.
4. The high plasticity cement product incorporating iron ore concentrate fines of claim 1 wherein said chalk is in the form of lumps.
5. The high-plasticity cement product doped with the iron ore concentrate powder as claimed in claim 1, wherein the correction material is diatomite, bauxite or siltstone.
6. The high-plasticity cement product doped with the iron ore concentrate powder as claimed in claim 1, wherein the iron ore concentrate is in a powder state.
7. The high-plasticity cement product doped with the iron ore concentrate powder as claimed in claim 1, wherein the high-strength fibers are concrete companion fibers.
8. The high-plasticity cement product doped with the iron ore dressing tailing powder according to claim 1, wherein the grinding aid is a composite compound in a powder state.
9. The method for preparing the high-plasticity cement product doped with the iron ore dressing tailings powder as claimed in claim 1, which is characterized by comprising the following steps:
step 1, mixing kiln dust, chalk, clay and correction materials together to prepare a mixed raw material with the particle diameter of 20-25 mm, and drying the mixed raw material by using a dryer, wherein the water content in the mixed raw material is controlled to be 1-2%;
step 2, feeding the prepared dried mixed raw material and grinding aid into a raw material mill together to prepare mixed powder, wherein the particle size of the mixed powder is less than 10mm, and then performing pre-homogenization treatment on the mixed powder in a 'flat-laying and straight-taking' mode;
step 3, feeding the homogenized mixed powder into a calcining kiln at the temperature of 1300-1500 ℃ for high-temperature calcination for 1-2 h, and taking out of the kiln for quenching to obtain clinker;
step 4, firstly spraying ceramic micro powder on the surface of the high-strength fiber, then crushing the high-strength fiber to prepare high-strength fiber scraps, then adding the high-strength fiber scraps, gypsum, iron tailings and water into the clinker prepared in the step 3, and fully mixing and stirring to prepare a plastic mixture;
and 5, filling the plastic mixture into a mold, pressing into sections, and curing at the temperature of 30-35 ℃ to obtain the high-plasticity cement product.
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| AU7879481A (en) * | 1980-12-22 | 1982-07-01 | Mesobo Pty Limited | Cementitious sheets |
| CN1982533A (en) * | 2005-12-13 | 2007-06-20 | 湖南梦洁家纺有限公司 | Far-infrared ceramic fabric |
| CN103011697A (en) * | 2011-09-20 | 2013-04-03 | 肖力光 | External thermal insulation polymer mortar produced by adopting iron tailings powder to replace fine quartz sand, and production method thereof |
| CN103121855A (en) * | 2011-11-21 | 2013-05-29 | 肖力光 | Self-thermal-insulating energy-saving wall body material based on iron tailings powder and preparation method of wall body material |
| CN104402348B (en) * | 2014-10-23 | 2016-04-06 | 天元建设集团有限公司 | Iron tailings powder foamed concrete and preparation method thereof |
| CN104876457A (en) * | 2015-05-26 | 2015-09-02 | 王品伦 | Iron ore tailings portland cement and making method of iron ore tailings portland cement |
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