CN112456848B - Steel slag micro-powder activity excitant, preparation method and preparation device thereof - Google Patents
Steel slag micro-powder activity excitant, preparation method and preparation device thereof Download PDFInfo
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- CN112456848B CN112456848B CN202011504013.4A CN202011504013A CN112456848B CN 112456848 B CN112456848 B CN 112456848B CN 202011504013 A CN202011504013 A CN 202011504013A CN 112456848 B CN112456848 B CN 112456848B
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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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- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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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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Abstract
The invention belongs to the technical field of steel slag micro-powder active exciting agents, and particularly relates to a steel slag micro-powder active exciting agent, a preparation method and a preparation device thereof, wherein the steel slag micro-powder active exciting agent comprises the following components in percentage by mass: 10 to 15 percent of diethanol monoisopropanolamine; 5 to 15 percent of glycerol; 20 to 30 percent of sodium thiosulfate; 5 to 10 percent of sodium silicate; 5 to 10 percent of sodium hydroxide; 35 to 50 percent of water. The invention provides a steel slag micro powder activity excitant for improving the activity of steel slag micro powder and promoting the recycling of steel slag solid waste, a preparation method and a preparation device thereof.
Description
Technical Field
The invention belongs to the technical field of steel slag micro-powder active exciting agents, and particularly relates to a steel slag micro-powder active exciting agent, a preparation method and a preparation device thereof.
Background
The prior art and the defects are as follows:
the steel slag is an industrial solid waste, is waste slag discharged in the steel-making process, and mainly comprises calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus and the like. The steel slag is cooled gradually at 1500 ℃ to form a solid solution formed by tricalcium silicate, dicalcium silicate, calcium forsterite, calcium magnesium multiflower hectorite, calcium aluminoferrite and oxides of silicon, magnesium, iron, manganese and phosphorus, and also contains a small amount of free calcium oxide, metallic iron, fluorapatite and other minerals.
From the scale of steel slag generation, the steel slag generation amount is about 10-15% of the crude steel yield, the steel slag yield per year in China is 1.0-1.2 hundred million tons at present, but the utilization rate of the steel slag is only 20-30%.
The key reasons that the steel slag is not recycled in a large scale are that the steel slag has low activity and poor grindability, the use amount of the steel slag in cement concrete is limited, the production cost is higher and the economical efficiency is deviated.
Aiming at the problem of low activity of steel slag, the prior technical route is to grind the steel slag to prepare steel slag micro powder, use an activity excitant and add the excitant into the micro powder to improve the activity. The main types of activity stimulators are:
silicates, carbonates of alkali metals, such as sodium silicate, i.e. water glass, also known as natron;
gypsum, dihydrate gypsum, hemihydrate gypsum or anhydrite;
the composite excitant is prepared by compounding sodium silicate and anhydrous gypsum and adding different types of inorganic minerals.
The existing alkali metal activator easily causes early setting of cement concrete, influences construction quality and causes subsequent expansion cracking, only has a small amount of application in acid-resistant concrete, the activator doped with gypsum easily causes excessive sulfur in concrete, and the existing activator has limited improvement on the activity of steel slag micropowder, so that the development of the steel slag micropowder activity activator for improving the activity of the steel slag micropowder and promoting the recycling of steel slag solid waste is urgently needed.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the steel slag micro powder activity excitant, the preparation method and the preparation device thereof for improving the activity of the steel slag micro powder and promoting the solid waste recycling of the steel slag have important practical significance.
Disclosure of Invention
The invention aims to provide a steel slag micro powder activity excitant for improving the activity of steel slag micro powder and promoting the solid waste recycling of steel slag, a preparation method and a preparation device thereof, aiming at solving the technical problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
the steel slag micro powder active exciting agent comprises the following components in percentage by mass:
10 to 15 percent of diethanol monoisopropanolamine;
5 to 15 percent of glycerol;
20 to 30 percent of sodium thiosulfate;
5 to 10 percent of sodium silicate;
5 to 10 percent of sodium hydroxide;
35 to 50 percent of water.
The invention can also adopt the following technical scheme:
in the steel slag micro powder active exciting agent, the purity of the diethanol monoisopropanolamine is more than or equal to 93.0%, and the molecular formula is shown as follows.
In the steel slag micro-powder activity excitant, the purity of the glycerol is more than or equal to 99.7 percent.
In the steel slag micro powder active exciting agent, the purity of the sodium thiosulfate is more than or equal to 99 percent, and the pH value is 6.5-9.5.
In the steel slag micro powder active exciting agent, the modulus of the sodium silicate is 1.5-2.0.
In the above steel slag micropowder activating agent, the sodium hydroxide is in the form of particles.
A preparation method of a steel slag micro powder active exciting agent comprises the following steps: and weighing the materials according to the composition, and uniformly mixing to obtain the steel slag micro powder activity excitant.
In the preparation method of the steel slag micro powder active exciting agent, further, the feeding sequence sequentially comprises water, sodium silicate, sodium hydroxide, sodium thiosulfate, and then diethanol monoisopropanolamine and glycerol.
In the preparation method of the steel slag micro powder active exciting agent, further, the mixing device is a reaction kettle, the stirring speed of the reaction kettle is 200-400 r/min, the mixing time is 15-30 min, and the constant temperature is 50-60 ℃.
Can be directly used after mixing.
The utility model provides a preparation facilities of steel slag miropowder activity exciting agent, preparation facilities of steel slag miropowder activity exciting agent includes raw materials transport reamer and reation kettle, be equipped with a plurality of raw materials storehouse on the raw materials transport reamer, fall on the raw materials transport reamer behind the raw materials of every raw materials storehouse through valve A, weighing hopper and valve B, reation kettle's feed inlet and the end-to-end connection of raw materials transport reamer, reation kettle's discharge gate and drying tower are connected, reation kettle peripheral hardware heat preservation, the intraformational heat preservation medium of heat preservation passes through the heat exchanger and maintains the temperature, the exciting agent dry powder of drying tower discharge gate passes through finished product transport reamer, carries to exciting agent storage storehouse.
In conclusion, the invention has the following advantages and positive effects:
1. the invention solves the problem of low activity of the existing steel slag micro powder, improves the activity of the steel slag micro powder, promotes the steel slag solid waste recycling, and improves the 28d activity index of the steel slag micro powder by 11-15%.
2. The diethanol monoisopropanolamine and the glycerol are organic matters and can react with metal ions under the alkaline condition to react Ca in the solution + 、Na + Continuously complexing and solidifying to continuously promote the formation of unsaturated solution and solid, thereby promoting the hydration of the steel slag micro powder, and the more full the hydration is, the higher the activity is; after the steel slag is ground, the surface of the steel slag has broken bonds, and in the alkaline environment formed by the exciting agent, [ SiO ] 4 ]The tetrahedron will undergo depolymerization to form H 3 SiO 4 — ，[AlO 4 ]The tetrahedron will depolymerize to H 3 AlO 4 2— And H is 3 SiO 4 — 、H 3 AlO 4 2— With Ca + 、Na + The reaction produces zeolite hydration products. When [ AlO ] 4 ]When the tetrahedra are depolymerized, [ AlO 6 ]With Al (OH) 2+ Is released from its original position into solution to form water-soluble ions and reacts with H already present in solution 3 SiO 4 — 、OH — 、Ca + And Na + React together to form a zeolite hydration product. The formation of zeolite-like hydration products consumes H formed by depolymerization 3 SiO 4 — 、H 3 AlO 4 2— The Si-O and Al-O bonds of the steel slag are continuously destroyed, and the process of the steel slag micro powder hydration is promoted. Sodium silicate here acts primarily as an inducer, and sodium hydroxide provides an alkaline reaction environment.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a fifth embodiment of the present invention.
In the figure:
1. raw material bin, 2, valves A and 3, a metering hopper, 4, valves B and 5, a raw material conveying reamer, 6, a reaction kettle, 7, a heat exchanger, 8, a drying tower, 9, a finished product conveying reamer, 10 and an excitant storage bin.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The raw materials, reagents or apparatuses used in the examples and comparative examples were all available from conventional commercial sources unless otherwise specified. Unless otherwise indicated, the testing or testing methods are conventional in the art.
In the following examples, the starting materials used are illustrated below: the steel slag is steel slag micro powder subjected to hot disintegration and iron removal, and the specific surface area is 470m 2 (iii) 3% of residue on a 45 μm sieve,/kg; the cement is the same batch of reference cement.
Example 1
The composition of the steel slag micropowder activating agent in this example is shown in table 1 below.
TABLE 1 composition of steel slag micropowder activity excitant
The specific processing method comprises the following steps: the feeding sequence is sequentially according to water, sodium silicate, sodium hydroxide, sodium thiosulfate, diethanol monoisopropanolamine and glycerol; mixing in a reaction kettle for 15min, and keeping the temperature at 50 ℃; the stirring speed of the reaction kettle is 200r/min.
B is an excitant prepared from sodium silicate and desulfurized gypsum, wherein the sodium silicate accounts for 10% and the desulfurized gypsum accounts for 90%.
The using effect of the steel slag micropowder activating agent in this example is shown in the following table 2.
TABLE 2 application effect of steel slag micropowder activity excitant
From the test results in table 2, the 28d activity index is improved by 11.0% under the condition that the steel slag micro powder activity exciting agent is added in an amount of 0.1%; the fluidity ratio of the steel slag micro powder reaches 105, and for engineering application, the increase of the fluidity ratio can reduce the use amount of additives in concrete and reduce the engineering cost. Compared with the excitant prepared by the sodium silicate composite desulfurized gypsum, the steel slag micro powder has higher improvement range.
Example 2
The composition of the steel slag micropowder activating agent of this example is shown in Table 3 below.
TABLE 3 composition of steel slag micropowder activity excitant
The specific processing method comprises the following steps: the feeding sequence is sequentially according to water, sodium silicate, sodium hydroxide, sodium thiosulfate, diethanol monoisopropanolamine and glycerol; mixing in a reaction kettle for 30min, and keeping the temperature at 50 ℃; the stirring speed of the reaction kettle is 300r/min.
The using effect of the steel slag micropowder activating agent in this example is shown in the following table 4.
TABLE 4 application effect of steel slag micropowder activity excitant
From the test results in table 4, after the effective components such as diethanol monoisopropanolamine, sodium silicate and the like are added, the 28d activity index is improved by 12.0 percent under the condition of the same doping amount of 0.1 percent of the steel slag micro powder activity exciting agent, the fluidity ratio of the steel slag micro powder reaches 108, and the comprehensive performance of the exciting agent is better.
Example 3
The composition of the steel slag micropowder activating agent of this example is shown in Table 5 below.
TABLE 5 composition of activator for activating steel slag micropowder
The specific processing method comprises the following steps: the feeding sequence is sequentially according to water, sodium silicate, sodium hydroxide, sodium thiosulfate, diethanol monoisopropanolamine and glycerol; mixing in a reaction kettle for 30min at a constant temperature of 60 ℃; the stirring speed of the reaction kettle is 300r/min.
The using effect of the steel slag micropowder activating agent in this example is shown in the following table 6.
TABLE 6 application effect of steel slag micropowder activity excitant
From the test results in table 6, under the conditions of increasing glycerol, increasing the proportion of effective components and prolonging the heat preservation time and under the condition of adopting the same mixing amount of 0.1% of the steel slag micro-powder activity excitant, the 28d activity index is improved by 11.2%, the fluidity ratio of the steel slag micro-powder reaches 106, which shows that under the condition of the same proportion of the effective components, the glycerol has weaker effect on improving the activity than the diethanol monoisopropanolamine and the sodium silicate.
Example 4
The composition of the steel slag micropowder activating agent of this example is shown in Table 7 below.
TABLE 7 composition of activator for activating steel slag micropowder
The specific processing method comprises the following steps: the feeding sequence is sequentially according to water, sodium silicate, sodium hydroxide, sodium thiosulfate, diethanol monoisopropanolamine and glycerol; mixing in a reaction kettle for 20min, and keeping the temperature at 50 ℃; the stirring speed of the reaction kettle is 400r/min.
The using effect of the steel slag micropowder activating agent in this example is shown in the following table 8.
TABLE 8 application effect of steel slag micropowder activity excitant
From the test results in table 8, the use amount of glycerol is reduced, the use amounts of diethanol monoisopropanolamine, sodium thiosulfate, sodium silicate and sodium hydroxide are balanced, the 28d activity index is improved by 15.0% under the condition that the same doping amount of the steel slag micro-powder activity excitant is 0.1%, and the fluidity ratio of the steel slag micro-powder reaches 108. The activity of the activator is obviously improved on the activity of the steel slag micro powder, the fluidity ratio is improved, the activator is very favorable for the construction performance of concrete, and the construction cost of the concrete can be greatly reduced.
Example 5
The utility model provides a preparation facilities of slag miropowder activity excitant, preparation facilities of slag miropowder activity excitant includes that the raw materials carries reamer and reation kettle, be equipped with a plurality of raw materials storehouse on the raw materials carries the reamer, and the raw materials in every raw materials storehouse falls on the raw materials carries the reamer after passing through valve A, weighing hopper and valve B, reation kettle's feed inlet and raw materials carry the end-to-end connection of reamer, reation kettle's discharge gate and drying tower are connected, reation kettle peripheral hardware heat preservation, the intraformational heat preservation medium of heat preservation passes through the heat exchanger and maintains the temperature, the excitant dry powder of drying tower discharge gate passes through finished product transport reamer, carries to excitant and stores the storehouse.
The working process is as follows: an excitant preparation system for preparing powdery steel slag micropowder active excitant comprises a raw material bin, a heat exchanger, a reaction kettle, a spray dryer and an excitant powder bin. Sequentially conveying the raw materials of the exciting agent to a reaction kettle according to a ratio, and carrying out reaction mixing according to certain operating parameters; the outer side of the reaction kettle is insulated by adopting water bath; the waste gas at 90 ℃ generated in the steel slag grinding system is used as a heat source and is led to a heat exchanger from a chimney, and the heat exchanger is used as a unit to heat water; the activator dry powder is formed in the spray dryer after reaction and mixing in the reaction kettle, and then the activator dry powder is conveyed to a powder bin for storage, and a metering device is arranged below the powder bin for use in the subsequent process.
In conclusion, the invention provides the steel slag micro powder activity excitant, the preparation method and the preparation device thereof, wherein the steel slag micro powder activity excitant is used for improving the activity of steel slag micro powder and promoting the recycling of steel slag solid waste.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The steel slag micro powder activity excitant is characterized in that: the steel slag micro powder active exciting agent comprises the following components in percentage by mass:
10% of diethanol monoisopropanolamine;
5% of glycerol;
30% of sodium thiosulfate and 6.5-9.5 of pHs;
10% of sodium silicate;
10% of sodium hydroxide;
35 percent of water.
2. The steel slag micropowder activity excitant according to claim 1, characterized in that: the purity of the diethanolisopropanolamine is more than or equal to 93.0 percent, and the molecular formula is shown as follows.
3. The steel slag micropowder activity excitant according to claim 1, characterized in that: the purity of the glycerol is more than or equal to 99.7 percent.
4. The steel slag micropowder activity excitant according to claim 1, characterized in that: the purity of the sodium thiosulfate is more than or equal to 99 percent.
5. The steel slag micropowder activity excitant according to claim 1, characterized in that: the modulus of the sodium silicate is 1.5 to 2.0.
6. The steel slag micropowder activity excitant according to claim 1, characterized in that: the sodium hydroxide is in the form of particles.
7. A preparation method of the steel slag micro powder active excitant is characterized by comprising the following steps: the preparation method of the steel slag micro-powder active exciting agent comprises the following steps: weighing the steel slag micropowder active excitant of any one of claims 1 to 6, and uniformly mixing to obtain the steel slag micropowder active excitant.
8. The preparation method of the steel slag micropowder activity excitant according to claim 7, which is characterized in that: the feeding sequence is water, sodium silicate, sodium hydroxide, sodium thiosulfate, then diethanol monoisopropanolamine and glycerol in sequence.
9. The method for preparing the steel slag micropowder active excitant according to claim 7, wherein the method comprises the following steps: the mixing equipment is a reaction kettle, the stirring speed of the reaction kettle is 200 to 400r/min, the mixing time is 15 to 30min, and the constant temperature is 50 to 60 ℃.
10. The method for preparing the steel slag micropowder active excitant according to claim 7, wherein the method comprises the following steps: the preparation method of the steel slag micro-powder active excitant uses a preparation device of the steel slag micro-powder active excitant, the preparation device of the steel slag micro-powder active excitant comprises a raw material conveying reamer and a reaction kettle, a plurality of raw material bins are arranged on the raw material conveying reamer, raw materials of each raw material bin fall on the raw material conveying reamer after passing through a valve A, a metering hopper and a valve B, a feed inlet of the reaction kettle is connected with the tail end of the raw material conveying reamer, a discharge outlet of the reaction kettle is connected with a drying tower, a heat preservation layer is arranged outside the reaction kettle, a heat preservation medium in the heat preservation layer maintains the temperature through a heat exchanger, and excitant dry powder at the discharge outlet of the drying tower is conveyed to an excitant storage bin through a finished product conveying reamer.
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| CN113185174B (en) * | 2021-04-13 | 2023-03-14 | 盛海聚源(山东)科技发展有限公司 | Steel slag activity excitant, active steel slag powder and application thereof |
| CN114230219B (en) * | 2021-12-02 | 2023-09-19 | 电子科技大学长三角研究院(湖州) | Preparation method and application of steel slag composite excitant |
| CN115925306B (en) * | 2022-11-22 | 2023-07-07 | 河海大学 | Dicalcium silicate activator and preparation method and application thereof |
| CN116217101A (en) * | 2022-12-08 | 2023-06-06 | 安徽马钢嘉华新型建材有限公司 | Steel slag treating agent and steel slag recycling method |
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