CN114213051A - Method for producing high-activity mineral admixture by exciting steel slag activity with lithium slag - Google Patents
Method for producing high-activity mineral admixture by exciting steel slag activity with lithium slag Download PDFInfo
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- CN114213051A CN114213051A CN202111615937.6A CN202111615937A CN114213051A CN 114213051 A CN114213051 A CN 114213051A CN 202111615937 A CN202111615937 A CN 202111615937A CN 114213051 A CN114213051 A CN 114213051A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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Abstract
The invention discloses a method for producing a high-activity mineral admixture by exciting steel slag activity by using lithium slag, belonging to the technical field of industrial waste slag utilization. The invention weighs 30-50% of lithium slag powder, 45-65% of steel slag powder and 5-10% of dust collecting powder according to the mass percentage, then the weighed lithium slag powder, steel slag powder and dust collecting powder are mixed evenly, and grinding aid is added to grind to obtain the ultrafine powder, namely the high-activity mineral admixture. The invention simultaneously utilizes the lithium slag and the steel slag as raw materials, thereby greatly reducing the manufacturing cost and obviously improving the environment; the invention adopts the sulfate roasting method to produce the water-quenched lithium slag of the lithium carbonate, and the amorphous silicon dioxide, the alumina, the sodium sulfate and the potassium sulfate which are simultaneously contained can be used for compositely exciting the activity of the steel slag, thereby preparing the mineral admixture with high activity and having good application prospect.
Description
Technical Field
The invention belongs to the technical field of industrial waste residue utilization, and particularly relates to a method for producing a high-activity mineral admixture by exciting steel slag activity by using lithium slag.
Background
The steel slag is waste slag generated in a metallurgical process, and the generation rate of the steel slag is 8-15% of the yield of crude steel. In recent years, the amount of steel slag generated in China is rapidly increased along with the rapid development of steel technology, so that the problems of treatment and resource utilization of steel slag are more and more emphasized.
The mineral composition and the chemical composition of the steel slag are close to those of silicate cement clinker, so that the steel slag is hopeful to be used as a high-quality cement admixture and a concrete admixture for building construction. However, at present, there are problems that the steel slag itself has poor activity and a slow hydration rate, and thus the steel slag has not been fully utilized.
Therefore, in order to realize the mass application of steel slag in building materials, how to activate the latent activity of steel slag becomes an important research topic at present.
Disclosure of Invention
Aiming at the defects of poor activity and slow hydration speed of the steel slag mentioned in the background art, the invention aims to provide a method for producing a high-activity mineral admixture by exciting the activity of the steel slag by using lithium slag.
A method for producing a high-activity mineral admixture by exciting steel slag activity by lithium slag comprises the following steps:
1) weighing 30-50% of lithium slag powder, 45-65% of steel slag powder and 5-10% of dust collection powder according to mass percentage for later use;
2) the weighed lithium slag powder, steel slag powder and dust collecting powder are uniformly mixed, and then grinding aid is added for grinding to obtain ultrafine powder, namely the high-activity mineral admixture.
Further, the lithium slag in the step 1) is water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method.
Further, the lithium slag powder needs to be dried until the water content is less than 3%.
Further, the lithium slag powder contains sodium sulfate and potassium sulfate.
Further, the total mass fraction of the sodium sulfate and the potassium sulfate in the lithium slag powder is 4.2-5.8%.
The main components of the lithium slag are amorphous silicon dioxide and aluminum oxide, which have good volcanic ash activity. In the hydration process, the calcium hydroxide precipitated in the hydration of the steel slag can be quickly reacted to generate C-S-H gel, so that the hydration process of the steel slag is further promoted.
The invention adopts a sulfate roasting method to produce water-quenched lithium slag of lithium carbonate, the lithium slag contains a certain amount of sodium sulfate and potassium sulfate, and the sodium sulfate and the potassium sulfate are compounds for exciting the activity of steel slag. However, when the content of sodium sulfate and potassium sulfate is too high or low, the excitation effect is remarkably different: when the content is too low, the concentration of the sodium sulfate and the potassium sulfate is too low to play an excitation role; when the content is too high, excessive sodium and potassium ions can cause alkali aggregate reaction to affect the cement performance. By integrating the process system of the invention, the invention selects the lithium slag powder with the total mass fraction of sodium sulfate and potassium sulfate being in the range of 4.2-5.8%.
The water-quenched lithium slag simultaneously contains amorphous silicon dioxide, aluminum oxide, a small amount of sodium sulfate and potassium sulfate, and can perform composite excitation on the activity of the steel slag.
Furthermore, the particle size of the dust collecting powder is 0.04-0.075 mm.
The dust collecting powder is fine powder generated in the production and processing process of stone materials, and the dust collecting powder with the particle size within 0.04-0.075mm is adopted in the invention, so that the matching relationship of the lithium slag powder and the steel slag powder selected by the invention can be coordinated, the excitation of the lithium slag on the steel slag is further promoted, and the activity of the steel slag is improved.
Further, the grinding aid is one or more of alcohol amine, polycarboxylic acid and formate; wherein, the formate can be any one of calcium formate, sodium formate and potassium formate.
Furthermore, the addition amount of the grinding aid is five-thousandths to two-thousandths of the total mass of the lithium slag powder, the steel slag powder and the dust collection powder.
The high-activity mineral admixture prepared by the method can be used as a high-quality cement admixture and a concrete admixture for building construction.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention makes full use of the industrial waste slag lithium slag and steel slag, greatly reduces the manufacturing cost and obviously improves the environment.
2. The invention adopts the sulfate roasting method to produce the water-quenched lithium slag of lithium carbonate, and can carry out compound excitation on the activity of the steel slag by utilizing the amorphous silicon dioxide, the aluminum oxide, the sodium sulfate and the potassium sulfate which are simultaneously contained.
3. The mineral admixture prepared by the method has high activity, the lithium slag proportion used by the mineral admixture can reach 50%, and compared with the prior art, the mineral admixture can better solve the environmental problem caused by the accumulation of a large amount of lithium slag.
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 embodiments. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Example 1
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 5.4% of the total mass.
And thirdly, weighing 4500 g of steel slag powder, 5000 g of lithium slag powder and 500 g of dust collection powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collection powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing, spraying the atomized powder on the mixed powder, grinding the powder for 60 minutes by using a small 500 x 500 test mill, and screening and grinding the powder for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the embodiment is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 6.8MPa in 7 days, and the compression resistance is 28.4MPa in 7 days; the fracture resistance is 8.9MPa in 28 days, and the compression resistance is 47.6MPa in 28 days.
Example 2
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 4.2% of the total mass.
And thirdly, weighing 4500 g of steel slag powder, 5000 g of lithium slag powder and 500 g of dust collection powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collection powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing, spraying the atomized powder on the mixed powder, grinding the powder for 60 minutes by using a small 500 x 500 test mill, and screening and grinding the powder for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the embodiment is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 6.3MPa in 7 days, and the compression resistance is 25.8MPa in 7 days; the fracture resistance is 7.9MPa in 28 days, and the compression resistance is 44.0MPa in 28 days.
Example 3
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 5.8% of the total mass.
And thirdly, weighing 4500 g of steel slag powder, 5000 g of lithium slag powder and 500 g of dust collection powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collection powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing, spraying the atomized powder on the mixed powder, grinding the powder for 60 minutes by using a small 500 x 500 test mill, and screening and grinding the powder for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the embodiment is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 6.4MPa in 7 days, and the compression resistance is 26.2MPa in 7 days; the fracture resistance is 8.0MPa in 28 days, and the compression resistance is 43.9MPa in 28 days.
Example 4
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 5.4% of the total mass.
Thirdly, weighing 4200 g of steel slag powder, 5200 g of lithium slag powder and 600 g of dust collecting powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collecting powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing the mixture, spraying the atomized mixture on the mixed powder, grinding the mixture for 60 minutes by using 500 × 500 test small powder, and sieving and grinding the mixture for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the embodiment is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 6.7MPa in 7 days, and the compression resistance is 28.8MPa in 7 days; the fracture resistance is 8.7MPa in 28 days, and the compression resistance is 46.9MPa in 28 days.
Comparative example 1
The cement used in the above examples is taken, and the obtained sample is tested according to the GB/20491-: the fracture resistance is 6.1MPa in 7 days, and the compression resistance is 34.5MPa in 7 days; the fracture resistance is 8.2MPa in 28 days, and the compression resistance is 51.5MPa in 28 days.
Comparative example 2
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
Secondly, the steel slag powder and the cement are mixed according to the ratio of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 4.9MPa in 7 days, and the compression resistance is 22.5MPa in 7 days; the fracture resistance is 7.0MPa in 28 days, and the compression resistance is 38.8MPa in 28 days.
Comparative example 3
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 3.0% of the total mass.
And thirdly, weighing 4500 g of steel slag powder, 5000 g of lithium slag powder and 500 g of dust collection powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collection powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing, spraying the atomized powder on the mixed powder, grinding the powder for 60 minutes by using a small 500 x 500 test mill, and screening and grinding the powder for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the comparative example is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 5.1MPa in 7 days, and the compression resistance is 23.3MPa in 7 days; the fracture resistance is 7.2MPa in 28 days, and the compression resistance is 40.4MPa in 28 days.
Comparative example 4
Crushing the steel slag into fine particles with the particle size not more than 3 millimeters, removing iron by using an iron remover with the magnetic strength of 1T, grinding for 60 minutes by using a 500 x 500 test mill, and sieving for 15 minutes to prepare steel slag powder for later use.
And secondly, drying the water-quenched lithium slag for producing lithium carbonate by a sulfate roasting method until the water content is less than 3%, wherein sodium sulfate and potassium sulfate in the dried lithium slag powder account for 6.5% of the total mass.
And thirdly, weighing 4500 g of steel slag powder, 5000 g of lithium slag powder and 500 g of dust collection powder, uniformly mixing the steel slag powder, the lithium slag powder and the dust collection powder, then taking 5 g of polycarboxylic acid and 5 g of polyalcohol amine respectively, atomizing, spraying the atomized powder on the mixed powder, grinding the powder for 60 minutes by using a small 500 x 500 test mill, and screening and grinding the powder for 15 minutes to obtain the composite admixture.
Fourthly, the composite admixture sample obtained in the comparative example is mixed with cement according to the proportion of 3:7, and the obtained sample is detected according to the GB/20491-: the fracture resistance is 5.5MPa in 7 days, and the compression resistance is 24.4MPa in 7 days; the fracture resistance is 7.4MPa in 28 days, and the compression resistance is 41.2MPa in 28 days.
As can be seen from the test data of the samples in the above examples and comparative examples, the performance of the composite mineral admixture prepared by exciting the activity of the steel slag by the lithium slag is greatly improved compared with that of pure steel slag, and the mineral admixture prepared by the invention has high activity.
The above-described embodiments are only preferred embodiments of the present invention and are not intended to limit the present invention. Various changes and modifications can be made by one skilled in the art, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for producing a high-activity mineral admixture by exciting steel slag activity by lithium slag is characterized by comprising the following steps:
1) weighing 30-50% of lithium slag powder, 45-65% of steel slag powder and 5-10% of dust collection powder according to mass percentage for later use;
2) the weighed lithium slag powder, steel slag powder and dust collecting powder are uniformly mixed, and then grinding aid is added for grinding to obtain ultrafine powder, namely the high-activity mineral admixture.
2. The method for producing the high-activity mineral admixture by activating the steel slag through the lithium slag according to claim 1, wherein the lithium slag in the step 1) is water-quenched lithium slag for producing lithium carbonate through a sulfate roasting method.
3. The method for producing the high-activity mineral admixture by using the lithium slag to excite the activity of the steel slag according to claim 2, wherein the lithium slag powder contains sodium sulfate and potassium sulfate.
4. The method for producing the high-activity mineral admixture by using the lithium slag to excite the activity of the steel slag according to claim 3, wherein the total mass fraction of the sodium sulfate and the potassium sulfate in the lithium slag powder is 4.2-5.8%.
5. The method for producing the high-activity mineral admixture by using the lithium slag to excite the activity of the steel slag according to claim 1, wherein the grinding aid is one or more compounds of alcohol amine, polycarboxylic acid and formate.
6. The method for producing the high-activity mineral admixture by using the lithium slag to excite the activity of the steel slag according to claim 1, wherein the addition amount of the grinding aid is five-thousandths to two thousandths of the total mass of the lithium slag powder, the steel slag powder and the dust collecting powder.
7. The highly active mineral admixture prepared by the method according to any one of claims 1 to 6 can be used as a high-quality cement admixture and a concrete admixture for building construction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115321898A (en) * | 2022-07-06 | 2022-11-11 | 四川省建筑科学研究院有限公司 | High-performance composite mineral admixture and preparation method thereof |
| CN116023057A (en) * | 2022-12-27 | 2023-04-28 | 南昌大学 | High-performance hydration driving material, and preparation method and application thereof |
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| CN111689701A (en) * | 2020-06-19 | 2020-09-22 | 中山大学 | Electric furnace steel slag-based cement admixture or concrete admixture, preparation method and application |
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| JPS53221A (en) * | 1976-06-23 | 1978-01-05 | Nippon Kokan Kk | Cement obtained by reforming slag from steel manufacture and method of manufacturing thereof |
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| CN116023057A (en) * | 2022-12-27 | 2023-04-28 | 南昌大学 | High-performance hydration driving material, and preparation method and application thereof |
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