CN111423199A - Method for utilizing acid regenerated iron powder in production of fly ash standard brick - Google Patents

Method for utilizing acid regenerated iron powder in production of fly ash standard brick Download PDF

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Publication number
CN111423199A
CN111423199A CN202010258506.8A CN202010258506A CN111423199A CN 111423199 A CN111423199 A CN 111423199A CN 202010258506 A CN202010258506 A CN 202010258506A CN 111423199 A CN111423199 A CN 111423199A
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China
Prior art keywords
fly ash
autoclave
pressure
iron powder
brick
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Pending
Application number
CN202010258506.8A
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Chinese (zh)
Inventor
仪桂兰
史永林
李昊堃
贺佳
董勇
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Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Priority to CN202010258506.8A priority Critical patent/CN111423199A/en
Publication of CN111423199A publication Critical patent/CN111423199A/en
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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
    • 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
    • C04B28/02Compositions 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 hydraulic cements other than calcium sulfates
    • C04B28/10Lime cements or magnesium oxide cements
    • C04B28/12Hydraulic lime
    • 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
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02Selection of the hardening environment
    • C04B40/024Steam hardening, e.g. in an autoclave

Abstract

The invention discloses a method for utilizing acid regenerated iron powder in producing a fly ash standard brick, which comprises the following steps: ball milling quicklime until the fineness reaches 10-20%; the method comprises the following steps of proportioning 36-42 parts of fly ash, 8-12 parts of quick lime, 17-20 parts of coarse slag, 19-22 parts of granulated slag, 3-8 parts of acid-regeneration iron powder and 8-11 parts of water; adding the materials into a stirrer for stirring for 2-4 minutes; feeding the stirrer, namely feeding the materials into a digestion bin for digestion for 50-150 minutes; milling the digestion material by using an edge runner mill for 4-5 minutes; pressing and molding the materials into a semi-finished fly ash standard brick by using a brick press under the pressure of 120-140 bar; performing autoclaved curing on the semi-finished fly ash standard brick by using an autoclave; and taking the semi-finished product of the autoclaved fly ash standard brick out of the kettle to obtain a finished product of the fly ash standard brick. The method effectively improves the utilization rate of the acid regenerated iron powder and conforms to the circular economy concept.

Description

Method for utilizing acid regenerated iron powder in production of fly ash standard brick
Technical Field
The invention belongs to the technical field of comprehensive utilization of resources, and particularly relates to a method for utilizing acid regenerated iron powder in production of a fly ash standard brick.
Background
In order to realize circular economy and improve the resource utilization rate, the waste hydrochloric acid after acid washing in the cold-rolled silicon steel plant generates hydrochloric acid and acid regeneration iron powder after the processes of pre-desiliconization, desiliconization and acid regeneration, the hydrochloric acid returns to the cold-rolled silicon steel plant for acid washing, but the acid regeneration iron powder lacks an effective reasonable utilization method at present, and particularly the important component Fe with the content of more than 99 percent in the acid regeneration iron powder2O3Cannot be fully utilized and does not accord with the concept of circular economy. Therefore, research on how to regenerate iron powder using acid is urgent.
Disclosure of Invention
Aiming at the low utilization rate of the existing acid regeneration iron powder, especially the important component Fe in the existing acid regeneration iron powder2O3The invention provides a method for utilizing acid regenerated iron powder in producing fly ash standard bricks, which solves the problem that the acid regenerated iron powder cannot be fully utilized and is not in line with the concept of recycling economy.
The utilization method of the acid regenerated iron powder in the production of the fly ash standard brick comprises the following steps:
step 1: ball milling quicklime, wherein the fineness is controlled to be 10-20% of the screen residue after passing through a 180-mesh screen;
step 2: mixing fly ash, quicklime, coarse slag, granulated slag, acid-regeneration iron powder and water according to a ratio by a metering scale, and discharging dry materials and water, wherein the mass parts of the raw materials are controlled as follows: 36-42 parts of fly ash, 8-12 parts of quick lime, 17-20 parts of coarse slag, 19-22 parts of granulated slag, 3-8 parts of acid-regenerated iron powder and 8-11 parts of water;
and step 3: feeding the materials which are subjected to the burdening in the step 2 into a stirrer for stirring, wherein the stirring time is controlled to be 2-4 minutes, and uniformly stirring the raw materials;
and 4, step 4: feeding the material stirred in the step (3) into a digestion bin through a belt to be digested to form a digested material, wherein the digestion time of the material in the digestion bin is controlled to be 50-150 minutes;
and 5: milling the digestion material by using an edge runner mill, wherein the milling time is controlled to be 4-5 minutes;
step 6: pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is controlled to be 120-140 bar;
and 7: carrying out autoclaved curing on the semi-finished product of the fly ash standard brick which is subjected to the compression molding by using an autoclave;
and 8: and (4) taking the semi-finished product of the standard fly ash brick subjected to the autoclaved curing in the step (7) out of the kettle to obtain a finished product of the standard fly ash brick.
Preferably, in the method for utilizing the acid-regenerated iron powder in the production of the fly ash standard brick, the total time of the feeding, stirring and blanking in the step 3 and the step 4 is controlled to be 5-7 minutes.
Preferably, in the method for utilizing the acid-regenerated iron powder in the production of the fly ash standard brick, the steam pressure curing of step 7 comprises the following steps: steam is led, and steam is led into the still kettle, wherein the steam leading time is controlled to be 0.5-1 hour; boosting, namely boosting the pressure of the autoclave, wherein the boosting time is controlled to be 1.5-2 hours, the temperature in the autoclave is kept at 185-200 ℃, and the pressure in the autoclave is increased to be more than or equal to 1.2MPa and then the boosting is finished; keeping the pressure of the autoclave constant, controlling the constant pressure time to be 5-7 hours, keeping the pressure in the autoclave at 1.0-1.2 MPa, and keeping the temperature in the autoclave at 174-195 ℃; and (3) reducing the pressure, namely reducing the pressure of the autoclave, controlling the pressure reduction time to be 1-2 hours, and reducing the pressure of the autoclave to 0.1 MPa.
Preferably, in the method for utilizing the acid-regenerated iron powder in the production of the standard fly ash brick, after the step 8, the finished product of the standard fly ash brick is inspected and graded, and then stored according to the specification and the variety.
The method for utilizing the acid regenerated iron powder in the production of the fly ash standard brick uses the acid regenerated iron powder to produce the fly ash standard brick, and the acid regenerated iron powder contains Fe2O3The content of (A) is more than 99 percent, Fe2O3The red fly ash standard brick is red, so that a certain proportion of acid regenerated iron powder is added when the fly ash standard brick is produced, and the red fly ash standard brick can be produced.
According to the inventionThe utilization method of the acid regenerated iron powder in the production of the fly ash standard brick uses the acid regenerated iron powder to produce the fly ash standard brick, effectively improves the utilization rate of the acid regenerated iron powder, and fully utilizes the important component Fe in the acid regenerated iron powder2O3Thereby meeting the circular economy idea.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Generally, the utilization method of the acid-regenerated iron powder in the production of the fly ash standard brick comprises the following steps:
preparing materials: ball-milling quicklime until the fineness reaches 10-20%, namely, the screen residue is 10-20% after passing through a 180-mesh screen, proportioning fly ash, quicklime, coarse slag, granulated slag, acid regenerated iron powder and water according to a ratio by a metering scale, firstly feeding dry materials, and then feeding water, wherein the raw materials are controlled by the following weight parts: 36-42 parts of fly ash, 8-12 parts of quick lime, 17-20 parts of coarse slag, 19-22 parts of granulated slag, 3-8 parts of acid-regenerated iron powder and 8-11 parts of water;
stirring and digesting: feeding the materials after the batching into a stirrer for stirring, wherein the stirring time is controlled to be 2-4 minutes, uniformly stirring the raw materials, then discharging the materials by the stirrer, feeding the materials into a digestion bin through a belt for digestion to form a digestion material, wherein the digestion time of the materials in the digestion bin is controlled to be 50-150 minutes, and the total time of the feeding, stirring and discharging is controlled to be 5-7 minutes;
milling: milling the digestion material by using an edge runner mill, wherein the milling time is controlled to be 4-5 minutes;
and (3) pressing and forming: pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is controlled to be 120-140 bar;
steam pressure curing: performing autoclaved curing on the semi-finished product of the fly ash standard brick which is subjected to compression molding by using an autoclave, and then taking the semi-finished product of the fly ash standard brick which is subjected to autoclaved curing out of the autoclave to obtain a finished product of the fly ash standard brick, wherein the autoclaved curing comprises the following steps: steam is led, and steam is led into the still kettle, wherein the steam leading time is controlled to be 0.5-1 hour; boosting, namely boosting the pressure of the autoclave, wherein the boosting time is controlled to be 1.5-2 hours, the temperature in the autoclave is kept at 185-200 ℃, and the pressure in the autoclave is increased to be more than or equal to 1.2MPa and then the boosting is finished; keeping the pressure of the autoclave constant, controlling the constant pressure time to be 5-7 hours, keeping the pressure in the autoclave at 1.0-1.2 MPa, and keeping the temperature in the autoclave at 174-195 ℃; and (3) reducing the pressure, namely reducing the pressure of the autoclave, controlling the pressure reduction time to be 1-2 hours, and reducing the pressure of the autoclave to 0.1 MPa.
The method for utilizing the acid-regenerated iron powder in producing the standard fly ash brick is described in the following with reference to specific examples.
Reference example
The utilization method of the acid regenerated iron powder in the production of the fly ash standard brick in the reference embodiment of the invention comprises the following steps:
(1) ball-milling 700kg of quicklime until the fineness reaches 13%, namely passing through a 180-mesh sieve and then sieving the rest by 13%, and then conveying the quicklime to a quicklime powder bin for storage for later use;
(2) weighing fly ash, quicklime, coarse slag, granulated slag, acid-regeneration iron powder and water according to a ratio by a weighing scale, and then batching, wherein 1760kg of fly ash, 400kg of quicklime, 840kg of coarse slag, 1000kg of granulated slag, 200kg of acid-regeneration iron powder and 400kg of water are firstly fed with dry materials and finally fed with water during batching;
(3) the method comprises the following steps of (1) feeding the proportioned materials to a stirrer through a metering scale for stirring, wherein the stirring time is 3 minutes, uniformly stirring all the materials, then discharging the materials by the stirrer, and feeding the materials into a digestion bin through a belt for digestion, wherein the whole period of feeding, stirring and discharging is about 6 minutes;
(4) the time for digesting the materials in the digestion bin is controlled to be 120 minutes, and the digested materials formed after digestion are taken out of the bin for the next procedure;
(5) milling the digestion material by using an edge runner mill for 5 minutes;
(6) pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is 120 bar;
(7) and (3) carrying out autoclaved curing on the semi-finished product of the fly ash standard brick formed by pressing by using an autoclave, wherein the autoclaved curing comprises the following steps: steam guiding: introducing steam into the autoclave for 34 minutes, wherein the steam can be introduced from various steam sources or other autoclaves to be depressurized on a fly ash standard brick production line; boosting, namely boosting the pressure of the autoclave for 1.6 hours, keeping the temperature in the autoclave at 190 ℃, and ending the boosting after the pressure in the autoclave reaches 1.3 MPa; keeping the pressure of the autoclave constant, keeping the pressure of the autoclave constant for 6 hours, keeping the pressure of the autoclave at 1.2MPa, and keeping the temperature of the autoclave at 190 ℃; reducing the pressure, namely reducing the pressure of the autoclave for 1 hour until the pressure is reduced to 0.1 Mpa;
(8) and taking the autoclaved and cured semi-finished fly ash standard brick out of the kettle to obtain a red fly ash standard brick finished product, and storing the red fly ash standard brick finished product according to specification and variety after inspection and classification.
Example 1
The utilization method of the acid-regenerated iron powder in the production of the fly ash standard brick in the embodiment 1 of the invention comprises the following steps:
(1) ball-milling 700kg of quicklime until the fineness reaches 12%, namely sieving the quicklime with a 180-mesh sieve to obtain 12% of the screen residue, and then conveying the quicklime to a quicklime powder bin for storage for later use;
(2) weighing fly ash, quicklime, coarse slag, granulated slag, acid regeneration iron powder and water according to a ratio by a weighing scale, and then batching, wherein 2200kg of fly ash, 500kg of quicklime, 1100kg of coarse slag, 1200kg of granulated slag, 420kg of acid regeneration iron powder and 650kg of water are firstly fed with dry materials and finally fed with water during batching;
(3) the method comprises the following steps of (1) feeding the proportioned materials to a stirrer through a metering scale for stirring, wherein the stirring time is 4 minutes, uniformly stirring all the materials, then discharging the materials by the stirrer, and feeding the materials into a digestion bin through a belt for digestion, wherein the whole period of feeding, stirring and discharging is about 7 minutes;
(4) the time for digesting the materials in the digestion bin is controlled to be 140 minutes, and the digested materials formed after digestion are taken out of the bin for the next procedure;
(5) milling the digestion material by using an edge runner mill for 4 minutes;
(6) pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is 130 bar;
(7) and (3) carrying out autoclaved curing on the semi-finished product of the fly ash standard brick formed by pressing by using an autoclave, wherein the autoclaved curing comprises the following steps: steam guiding: introducing steam into the autoclave for 40 minutes, wherein the steam can be introduced from various steam sources or other autoclaves to be depressurized on a fly ash standard brick production line; boosting, namely boosting the pressure of the autoclave for 1.5 hours, keeping the temperature in the autoclave at 190 ℃, and ending the boosting after the pressure in the autoclave reaches 1.2 MPa; keeping the pressure of the autoclave constant, keeping the pressure of the autoclave constant for 6 hours, keeping the pressure in the autoclave at 1.2MPa, and keeping the temperature in the autoclave at 186 ℃; reducing the pressure, namely reducing the pressure of the autoclave for 1 hour until the pressure is reduced to 0.1 Mpa;
(8) and taking the autoclaved and cured semi-finished fly ash standard brick out of the kettle to obtain a red fly ash standard brick finished product, and storing the red fly ash standard brick finished product according to specification and variety after inspection and classification.
Example 2
The method for utilizing the acid regenerated iron powder in the production of the fly ash standard brick in the embodiment 2 comprises the following steps:
(1) ball-milling 800kg of quicklime until the fineness reaches 14 percent, namely passing through a 180-mesh sieve and then sieving the remainder by 14 percent, and then conveying the quicklime to a quicklime powder bin for storage for later use;
(2) weighing and proportioning the fly ash, the quicklime, the coarse slag, the granulated slag, the acid regenerated iron powder and the water according to a ratio by a weighing scale, wherein 2640kg of the fly ash, 600kg of the quicklime, 1260kg of the coarse slag, 1500kg of the granulated slag, 300kg of the acid regenerated iron powder and 720kg of water are weighed, and firstly, drying and finally, draining are carried out during proportioning;
(3) the method comprises the following steps of (1) feeding the proportioned materials to a stirrer through a metering scale for stirring, wherein the stirring time is 3.5 minutes, uniformly stirring all the materials, then discharging the materials by the stirrer, and feeding the materials into a digestion bin through a belt for digestion, wherein the whole period of feeding, stirring and discharging is about 7 minutes;
(4) the time for digesting the materials in the digestion bin is controlled to be 150 minutes, and the digested materials formed after digestion are taken out of the bin for the next procedure;
(5) milling the digestion material by using an edge runner mill for 5 minutes;
(6) pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is 140 bar;
(7) and (3) carrying out autoclaved curing on the semi-finished product of the fly ash standard brick formed by pressing by using an autoclave, wherein the autoclaved curing comprises the following steps: steam guiding: introducing steam into the autoclave for 42 minutes, wherein the steam can be introduced from various steam sources or other autoclaves to be depressurized on a fly ash standard brick production line; boosting, namely boosting the pressure of the autoclave for 2 hours, keeping the temperature in the autoclave at 195 ℃, and ending the boosting after the pressure in the autoclave reaches 1.3 MPa; keeping the pressure of the autoclave constant, keeping the pressure of the autoclave constant for 7 hours, keeping the pressure of the autoclave at 1.2MPa, and keeping the temperature of the autoclave at 190 ℃; reducing the pressure, namely reducing the pressure of the autoclave for 1 hour until the pressure is reduced to 0.1 Mpa;
(8) and taking the autoclaved and cured semi-finished fly ash standard brick out of the kettle to obtain a red fly ash standard brick finished product, and storing the red fly ash standard brick finished product according to specification and variety after inspection and classification.
The utilization method of the acid regenerated iron powder in the production of the fly ash standard brick uses the acid regenerated iron powder to produce the fly ash standard brick, effectively improves the utilization rate of the acid regenerated iron powder, and fully utilizes the important component Fe in the acid regenerated iron powder2O3Thereby meeting the circular economy idea.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.

Claims (4)

1. A method for utilizing acid-regenerated iron powder in production of fly ash standard bricks is characterized by comprising the following steps:
step 1: ball milling quicklime, wherein the fineness is controlled to be 10-20% of the screen residue after passing through a 180-mesh screen;
step 2: mixing fly ash, quicklime, coarse slag, granulated slag, acid-regeneration iron powder and water according to a ratio by a metering scale, and discharging dry materials and water, wherein the mass parts of the raw materials are controlled as follows: 36-42 parts of fly ash, 8-12 parts of quick lime, 17-20 parts of coarse slag, 19-22 parts of granulated slag, 3-8 parts of acid-regenerated iron powder and 8-11 parts of water;
and step 3: feeding the materials which are subjected to the burdening in the step 2 into a stirrer for stirring, wherein the stirring time is controlled to be 2-4 minutes, and uniformly stirring the raw materials;
and 4, step 4: feeding the material stirred in the step (3) into a digestion bin through a belt to be digested to form a digested material, wherein the digestion time of the material in the digestion bin is controlled to be 50-150 minutes;
and 5: milling the digestion material by using an edge runner mill, wherein the milling time is controlled to be 4-5 minutes;
step 6: pressing and molding the milled materials by using a brick press to form a semi-finished product of the fly ash standard brick, wherein the pressure is controlled to be 120-140 bar;
and 7: carrying out autoclaved curing on the semi-finished product of the fly ash standard brick which is subjected to the compression molding by using an autoclave;
and 8: and (4) taking the semi-finished product of the standard fly ash brick subjected to the autoclaved curing in the step (7) out of the kettle to obtain a finished product of the standard fly ash brick.
2. The method for utilizing acid-regenerated iron powder in producing the fly ash standard brick according to claim 1, wherein the total time of the charging, stirring and blanking in the step 3 is controlled to be 5-7 minutes.
3. The method for utilizing acid-regenerated iron powder in producing fly ash standard bricks according to claim 1, wherein the autoclaving in step 7 comprises:
steam is led, and steam is led into the still kettle, wherein the steam leading time is controlled to be 0.5-1 hour;
boosting, namely boosting the pressure of the autoclave, controlling the boosting time to be 1.5-2 hours, keeping the temperature in the autoclave at 185-200 ℃, and ending the boosting when the pressure in the autoclave reaches more than or equal to 1.2 MPa;
keeping the pressure of the autoclave constant, controlling the constant pressure time to be 5-7 hours, keeping the pressure in the autoclave at 1.0-1.2 MPa, and keeping the temperature in the autoclave at 174-195 ℃;
and (3) reducing the pressure, namely reducing the pressure of the autoclave, controlling the pressure reduction time to be 1-2 hours, and reducing the pressure of the autoclave to 0.1 MPa.
4. The method for utilizing acid-regenerated iron powder in producing the standard fly ash brick according to claim 1, wherein after the step 8, the finished product of the standard fly ash brick is inspected and graded, and then stored according to specification and variety.
CN202010258506.8A 2020-04-03 2020-04-03 Method for utilizing acid regenerated iron powder in production of fly ash standard brick Pending CN111423199A (en)

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CN105254278A (en) * 2015-10-17 2016-01-20 无为县华标新型墙体材料有限公司 Red fly ash sintered brick material

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KR101094863B1 (en) * 2011-09-06 2011-12-16 (주)대우건설 Method for manufacturing solid using fly ashes as aggregate
CN104876523A (en) * 2015-05-22 2015-09-02 太原钢铁(集团)有限公司 Autoclaved flyash-lime brick and preparation method thereof
CN104892018A (en) * 2015-05-22 2015-09-09 太原钢铁(集团)有限公司 Preparation method of autoclaved fly ash perforated brick
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