CN115716719A - Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process - Google Patents
Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process Download PDFInfo
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- CN115716719A CN115716719A CN202211568752.9A CN202211568752A CN115716719A CN 115716719 A CN115716719 A CN 115716719A CN 202211568752 A CN202211568752 A CN 202211568752A CN 115716719 A CN115716719 A CN 115716719A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
A method for preparing cement iron correcting material by utilizing a coal ash magnetic separation process belongs to the technical field of comprehensive utilization of industrial wastes, solves the problem of high cost of cement iron materials on one hand, provides a new method for comprehensive utilization of coal ash on the other hand, and develops a new utilization approach for solid waste resources. The solution is as follows: determining proper slurry concentration by adopting wet selection; two-stage magnetic separation is designed, wherein the first stage is used for enriching iron powder in the fly ash, and the second stage is used for finely separating the enriched iron powder; the determination of the grinding time is controlled, and after the first-stage magnetic separation is finished, the iron powder is subjected to wet grinding, so that impurities such as quartz, mullite and the like can be effectively removed. The invention utilizes the fly ash to produce the high-quality cement iron correction material, the TFe grade can reach 25-30%, the cement iron correction material is an ideal iron correction material for cement, and compared with the traditional iron correction materials such as iron ore powder, steel slag and the like, the cement iron correction material has the advantages of high grade, less impurities, strong stability, low cost and the like.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of industrial wastes, and particularly relates to a method for preparing a cement iron correcting material by using a fly ash magnetic separation process.
Background
Fly ash is fine ash collected from flue gas generated after coal combustion, and is main solid waste discharged from a coal-fired power plant. Along with the development of the power industry, the discharge amount of fly ash of coal-fired power plants is increased year by year, and the fly ash becomes one of industrial waste residues with larger discharge amount in China. A large amount of fly ash can generate dust without treatment, pollute the atmosphere, cause river silting if discharged into a water system, and cause harm to human bodies and organisms due to toxic chemical substances in the fly ash. But the fly ash can be recycled, such as being used as an iron correction material of cement and the like.
At present, the comprehensive utilization rate of the fly ash is low, most of the fly ash is used as a raw material of a building material, and iron ore powder is used as an iron raw material in the production of the cement industry. China is a poor mine country, iron ore resources are in short supply, and due to the problems of transport distance, market price, grade and the like, the price of iron ore powder is in a higher position. This also increases the production cost of cement, and therefore, it is of practical significance to make reasonable use of the solid waste according to its characteristics.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provides a method for preparing a cement iron correction material by using fly ash through a magnetic separation-grinding-magnetic separation process. On one hand, the method can solve the problem of high cost of cement iron materials, on the other hand, a new method is provided for the comprehensive utilization of the fly ash, and a new utilization way is developed for solid waste resources.
The design concept of the invention is as follows: fly ash main component SiO 2 、Al 2 O 3 、Fe 2 O 3 、Fe 3 O 4 MgO, caO, wherein SiO 2 、Al 2 O 3 The mass fraction of the components accounts for 75-85% of the total mass of the fly ash, and the mass fraction of TFe is about 3-6%. The mass fraction of TFe in the cement is about 6-18%, iron ore powder needs to be additionally added when cement clinker is produced, and tetracalcium aluminoferrite (4 CaO. Al) is generated in the firing process 2 O 3 ·FeO 3 ) The strength of the hardened cement is improved. Therefore, the magnetic separation fly ash concentrate can effectively replace iron ore powder, and is an ideal raw material for preparing the cement and iron correction material.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for preparing a cement and iron correction material by using a fly ash magnetic separation process comprises the following steps:
s1, raw material pretreatment: sieving the fly ash raw material by a 50-mesh sieve, removing large blocks of slag, and then drying the sieved fly ash for later use;
s2, preparing ore pulp: weighing the fly ash prepared in the step S1, adding the fly ash and water according to a mass ratio of 1;
s3, first-stage magnetic separation: putting the evenly mixed ore pulp prepared in the step S2 into a magnetic separator, performing wet separation by adopting a strong magnetic field, wherein the magnetic field intensity is 800kA/m, and draining water for later use of the material subjected to the first-stage magnetic separation;
s4, grinding mineral powder: carrying out wet grinding on the material subjected to the magnetic separation in the step S3 through a grinding sampling machine, wherein the grinding time is 6 min to 8min;
s5, two-stage magnetic separation: and (3) uniformly mixing the mineral powder ground in the step (S4) with water according to the mass ratio of 1.
The invention is characterized in that the invention is embodied in the following aspects:
1. determination of magnetic field strength: the iron-containing material in the fly ash belongs to a weak magnetic substance, and a proper magnetic field intensity needs to be selected, so that the high-efficiency selection can be realized, and the energy waste can be avoided;
2. development of a coal ash magnetic separation process:
(1) Determining proper slurry concentration by adopting wet selection;
(2) Designing two-stage magnetic separation, wherein the first stage is used for enriching iron powder in the fly ash, and the second stage is used for finely separating the enriched iron powder;
(3) And developing a grinding process: the determination of the grinding time is controlled, and after the first-stage magnetic separation is finished, the iron powder is subjected to wet grinding, so that impurities such as quartz, mullite and the like can be effectively removed, and compared with a process of grinding firstly and then selecting, the grinding cost can be greatly reduced.
Further, in the step S3, the recovery rate of the material after draining off the water is 8%.
Further, in the step S4, the recovery rate of the ore powder with the particle size of 325 mesh after the ore powder is ground is 5%.
Further, in the step S5, the recovery rate of the iron ore powder for preparing the cement and iron correction material is 4%.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes the fly ash to produce the high-quality cement and iron correction material, the TFe grade can reach 25-30%, the fineness is less than 5.0%, the average grain diameter is 34.31 mu m, and SiO 2 30-35% of Al 2 O 3 The cement raw material has the mass fraction of 20-25%, is an ideal iron correction material for cement, can be doped into a cement raw material, has the doping amount of 5-10%, has the advantages of high grade, less impurities, strong stability, low cost and the like compared with the traditional iron correction materials such as iron ore powder, steel slag and the like, and is a new way for comprehensively utilizing the fly ash.
Drawings
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a particle size distribution diagram of the product.
Detailed Description
The invention is described in further detail below with reference to the figures and examples.
As shown in figure 1, the method for preparing the cement iron correcting material by using the fly ash magnetic separation process comprises the following steps:
s1, raw material pretreatment: sieving the fly ash raw material by a 50-mesh sieve, removing large blocks of slag, and then drying the sieved fly ash for later use;
s2, preparing ore pulp: weighing the fly ash prepared in the step S1, adding the fly ash and water according to a mass ratio of 1;
s3, first-stage magnetic separation: putting the evenly mixed ore pulp prepared in the step S2 into a magnetic separator, performing wet separation by adopting a strong magnetic field, wherein the magnetic field intensity is 800kA/m, draining water of the material subjected to the first-stage magnetic separation for later use, and the recovery rate of the material subjected to water draining is 8%;
s4, grinding mineral powder: wet grinding the material subjected to the magnetic separation in the step S3 through a crushing sampling machine for 6 min to 8min, wherein the recovery rate of the ground mineral powder with the particle size of 325 meshes is 5 percent;
s5, two-stage magnetic separation: and (2) uniformly mixing the ore powder ground in the step (S4) with water according to a mass ratio of 1 to 3, performing secondary magnetic separation by using a weak magnetic field, wherein the magnetic field intensity is 100kA/m, drying the ore powder subjected to secondary magnetic separation, and obtaining the iron ore powder for preparing the cement iron correction material, wherein the recovery rate of the iron ore powder for preparing the cement iron correction material is 4%, the grade of the iron ore powder TFe can reach 25-30%, and the fineness is less than 5.0%.
The components of the cement iron correction material prepared by mixing the iron ore powder prepared in the embodiment with other raw materials are shown in the following table 1.
Wherein, siO 2 30-35% of Al 2 O 3 The mass fraction of the cement is 20-25%, and the cement is used as an iron correction material of portland cement, compared with the conventional iron correction material using iron ore powder, steel slag and the likeThe correcting material has the advantages of high grade, less impurities, strong stability, low cost and the like, and can effectively reduce the production cost of cement.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A method for preparing a cement and iron correcting material by utilizing a fly ash magnetic separation process is characterized by comprising the following steps:
s1, raw material pretreatment: sieving the fly ash raw material by a 50-mesh sieve, removing large blocks of slag, and then drying the sieved fly ash for later use;
s2, preparing ore pulp: weighing the coal ash prepared in the step S1, adding the coal ash and water according to a mass ratio of 1;
s3, first-stage magnetic separation: putting the evenly mixed ore pulp prepared in the step S2 into a magnetic separator, performing wet separation by adopting a strong magnetic field, wherein the magnetic field intensity is 800kA/m, and draining water for later use of the material subjected to the first-stage magnetic separation;
s4, grinding mineral powder: carrying out wet grinding on the material subjected to the magnetic separation in the step S3 through a crushing sampling machine, wherein the grinding time is 6 min to 8min;
s5, two-stage magnetic separation: and (3) uniformly mixing the mineral powder ground in the step (S4) with water according to the mass ratio of 1.
2. The method for preparing the cement and iron correction material by using the magnetic separation process of the fly ash as claimed in claim 1, which is characterized by comprising the following steps of: in the step S3, the recovery rate of the materials after the water is drained is 8%.
3. The method for preparing the cement and iron correcting material by using the magnetic separation process of the fly ash as claimed in claim 1, which is characterized in that: in the step S4, the recovery rate of the ore powder with the particle size of 325 meshes after the ore powder is ground is 5%.
4. The method for preparing the cement and iron correcting material by using the magnetic separation process of the fly ash as claimed in claim 1, which is characterized in that: in the step S5, the recovery rate of the mineral powder for preparing the cement and iron correction material is 4%.
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| CN202211568752.9A CN115716719A (en) | 2022-12-08 | 2022-12-08 | Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process |
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| CN202211568752.9A CN115716719A (en) | 2022-12-08 | 2022-12-08 | Method for preparing cement iron correcting material by utilizing fly ash magnetic separation process |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689112A (en) * | 2016-03-16 | 2016-06-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for magnetically separating iron ore concentrate from coal ash |
| CN105903562A (en) * | 2016-04-18 | 2016-08-31 | 武汉科技大学 | Method for extracting iron ore concentrate from flyash |
| CN107537676A (en) * | 2017-08-30 | 2018-01-05 | 四川深蓝环保科技有限公司 | A kind of method that iron is selected in flyash |
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- 2022-12-08 CN CN202211568752.9A patent/CN115716719A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105689112A (en) * | 2016-03-16 | 2016-06-22 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for magnetically separating iron ore concentrate from coal ash |
| CN105903562A (en) * | 2016-04-18 | 2016-08-31 | 武汉科技大学 | Method for extracting iron ore concentrate from flyash |
| CN107537676A (en) * | 2017-08-30 | 2018-01-05 | 四川深蓝环保科技有限公司 | A kind of method that iron is selected in flyash |
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