CN114890692B - Lepidolite slag cement - Google Patents
Lepidolite slag cement Download PDFInfo
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- CN114890692B CN114890692B CN202210667161.0A CN202210667161A CN114890692B CN 114890692 B CN114890692 B CN 114890692B CN 202210667161 A CN202210667161 A CN 202210667161A CN 114890692 B CN114890692 B CN 114890692B
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/40—Dehydrating; Forming, e.g. granulating
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/52—Grinding aids; Additives added during grinding
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention discloses lepidolite slag cement, which is prepared by utilizing waste lepidolite slag after lithium extraction to act on cement to modify the cement, so that the mechanical property of the cement after 28 days can be effectively improved, meanwhile, an auxiliary agent is used for improving the components of the lepidolite slag cement, the setting time of the lepidolite slag cement is improved, fly ash is used as a carrier to load a grinding aid to be used as the auxiliary agent, the cement setting time is improved, the liquid suction during ball milling is reduced, the phenomenon that the liquid grinding aid is easy to agglomerate when being added into the ball milling at one time is avoided, the grinding aid can be added into the ball milling at one time, the process difficulty during ball milling is reduced, the lepidolite slag cement is more suitable for industrial production, and the phenomenon that the cement agglomerates during the production process is reduced due to the fact that no additional liquid is added, and the quality of the lepidolite slag cement is ensured.
Description
Technical Field
The invention relates to the field of building materials, in particular to lepidolite slag cement.
Background
Lepidolite is an important raw material for extracting rare metal lithium, and the lithium has the characteristics of low density and strong chemical activity and is widely applied to important fields of electronic information, aerospace, nuclear industry and the like.
In principle, how to efficiently and economically decompose lepidolite and dissolve out lithium in the lepidolite is the key to the extraction of lithium by using lepidolite ore so as to prepare various lithium compounds. A large amount of solid waste residues can be generated after the lithium is extracted from the lepidolite, and the frost resistance, 28d and later strength of the silicate cement can be effectively improved when the lepidolite lithium-extracted waste residues are acted in the field of buildings, but because SO in the lepidolite 3 The content is high, the caking phenomenon is often caused in the use process, the setting time is long, the strength before 28 days is low, the construction is difficult, and the rework phenomenon is often caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the lepidolite slag cement.
In order to solve the technical problems, the invention adopts the following technical scheme,
a lepidolite slag cement is prepared from the following raw materials in parts by weight: 70-80 parts of cement clinker, 5-15 parts of lepidolite lithium extraction tailings, 3-5 parts of desulfurized gypsum and 0.5-2 parts of auxiliary agent;
the auxiliary agent comprises 50-90% of fly ash and the balance of grinding aid loaded on the fly ash in percentage by weight.
Preferably, the preparation method comprises the following steps:
s1, weighing lepidolite lithium extraction tailings according to a material preparation ratio, and drying at 90-100 ℃ to obtain a first treatment material;
s2, after the first treatment material is cooled to room temperature, weighing cement clinker and desulfurized gypsum according to a proportion and mixing the cement clinker and desulfurized gypsum with the cooled first treatment material to obtain a second treatment material;
s3, ball-milling the second treatment material after double rollers, adding an auxiliary agent during ball milling, and milling until the specific surface area is 300-400m & lt 2 & gt/Kg to obtain the lepidolite slag cement;
preferably, the grinding aid comprises, by weight percent: 1-10% of triethanolamine, 1-10% of ammonium chloride, 1-10% of sodium dodecyl diphenyl ether disulfonate, 1-10% of silicon nitride and the balance of glycol.
The invention also provides a preparation method of the lepidolite lithium extraction tailings, which is characterized by comprising the following steps of:
grinding lepidolite slag to 60-80 meshes, immersing the lepidolite slag in an acid solvent for 1-2h, and performing solid-liquid separation to obtain a first treatment substance of a solid substance;
the weight ratio of the lepidolite residues to the acidic solvent is 1:1-2;
presintering the first treated substance at 100-200 deg.C for 20-90min, and rapidly cooling at-5~5 deg.C to obtain a second treated substance;
mixing the second treatment substance with 17.5mol/L acetic acid aqueous solution according to the weight ratio of 1.1-0.3, roasting at 800-1200 ℃ for 10-20min, and cooling to obtain a third treatment substance;
stirring and washing the third treatment substance in deionized water at 60-100 ℃ for 1-2h, performing solid-liquid separation to obtain a solid, washing and soaking the solid in deionized water for 0.5-1h, washing to neutrality, and performing suction filtration to obtain lepidolite lithium extraction tailings.
Preferably, the acidic solvent comprises:
the acid solvent comprises 5-10% of nitric acid, 1-10% of salicylic acid, 1-10% of lactic acid and the balance of deionized water in percentage by weight.
Preferably, the grinding aid also comprises the following components in percentage by weight: 1-10% of sodium nitrite, 1-2% of fatty acid ester, 0.2-2% of methyl ethyl carbonate, 0.1-0.2% of diethanolamine and 0.05-0.1% of fructose-6-phosphoric acid.
Compared with the prior art, the invention has the advantages that:
1. the auxiliary agent is used for improving the components of the lepidolite slag cement, the setting time of the lepidolite slag cement is improved, the fly ash and the grinding aid are used as the auxiliary agent, the grinding aid is loaded on the fly ash, the liquid suction during ball milling is reduced while the cement setting time is improved, the phenomenon that the liquid grinding aid is easy to agglomerate when being added into the fly ash at one time is avoided, the grinding aid can be added into the ball milling at one time, the process difficulty during ball milling is reduced, the lepidolite slag cement grinding aid is more suitable for industrial production of cement, the cement agglomeration phenomenon in the production process is reduced due to the fact that no additional liquid is added, and the quality of the lepidolite slag cement is ensured;
2. the fly ash is used as a carrier to load a grinding aid, triethanolamine, ammonium chloride, sodium dodecyl diphenyl ether disulfonate, silicon nitride and glycol in the grinding aid act simultaneously, the setting time of the grinding aid can be further adjusted while grinding aid is carried out, the rework risk is reduced, the over-grinding phenomenon is reduced by adjusting the flow speed in a mill, and the mechanical property of the lepidolite slag cement is stabilized;
3. the lepidolite lithium extraction tailings are subjected to a drying process, so that the internal moisture is reduced, the agglomeration phenomenon and uneven particle generation phenomenon during material mixing and ball milling are reduced, the quality problem of partial quick-setting and partial slow-setting of the finished lepidolite slag cement is solved, and the mechanical property and the setting time of the finished lepidolite slag cement are further stabilized;
4. as the fly ash is loaded with the grinding aid and is mixed with the clinker cement, the lepidolite lithium extraction tailings and the desulfurized gypsum together, the pair of rollers can change the properties of the fly ash and influence the performance of the loaded grinding aid, and therefore, the auxiliary agent is added during ball milling, the property influence of the auxiliary agent on the fly ash is reduced, and the quality of the lepidolite slag cement finished product is ensured.
5. The performance of the lepidolite residue is modified by an acid solvent and acetic acid, so that the obtained lepidolite lithium extraction tailings have better specific surface area and active ingredients, and then deionized water is used for heating, washing and rinsing to be neutral, so that the specific surface area of the lepidolite lithium extraction tailings is improved, and meanwhile, a third treatment object is subjected to secondary modification, so that the 3d strength of the lepidolite residue cement is improved;
6. carrying out primary soaking and low-temperature calcination on the lepidolite residues through nitric acid, salicylic acid and lactic acid, and carrying out modification pretreatment on the lepidolite residues to further improve the 3d strength of the lepidolite residue cement;
7. the method solves the problem of setting time of the lepidolite slag cement by using triethanolamine, ammonium chloride, sodium dodecyl diphenyl ether disulfonate, silicon nitride and glycol as grinding aids, solves the problem of easy agglomeration during ball milling by using a pre-drying process of the lepidolite lithium extraction tailings, and solves the problem of low 3d strength of the lepidolite slag cement by modifying the performance of the lepidolite slag through an acidic solvent and acetic acid, but the treatment of the lepidolite lithium extraction tailings and the selection of the grinding aids lead to the reduction of 28d strength of the lepidolite slag cement and the reduction of chloride ion permeation resistance.
Detailed Description
The invention is further described in the following description and specific examples, but the scope of the invention is not limited thereby.
Example 1
The lepidolite slag cement is prepared from the following raw materials in parts by weight: 80 parts of cement clinker, 10 parts of lepidolite lithium extraction tailings, 4 parts of desulfurized gypsum and 2 parts of auxiliary agent;
the auxiliary agent comprises 80 percent of fly ash and the balance of grinding aid loaded on the fly ash in percentage by weight;
the preparation method comprises the following steps:
s1, weighing lepidolite lithium extraction tailings according to a stock preparation ratio, and drying at 100 ℃ to obtain a first treatment material;
s2, after the first treatment material is cooled to room temperature, weighing cement clinker and desulfurized gypsum according to a proportion and mixing the cement clinker and desulfurized gypsum with the cooled first treatment material to obtain a second treatment material;
s3, ball-milling the second processing material after double rollers, adding an auxiliary agent during ball milling, and milling until the specific surface area is 380m & lt 2 & gt/Kg to obtain the lepidolite slag cement;
specifically, the grinding aid comprises the following components in percentage by weight: 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl ether disulfonate, 5% of silicon nitride, 7% of sodium nitrite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol;
preferably, the preparation method of the lepidolite lithium extraction tailings comprises the following steps:
grinding lepidolite slag to 70 meshes, immersing the lepidolite slag in an acid solvent for 1.5h, and performing solid-liquid separation to obtain a first treatment substance of a solid substance;
the weight ratio of the lepidolite residues to the acidic solvent is 1:2;
presintering the first treated substance at 200 deg.C for 40min, and rapidly cooling at 0 deg.C to obtain second treated substance;
mixing the second processed product with 17.5mol/L acetic acid aqueous solution according to the weight ratio of 1;
stirring and washing the third treated substance in deionized water at 90 ℃ for 1.5h, performing solid-liquid separation to obtain a solid, washing and soaking the solid in deionized water for 0.5h, washing to be neutral, and performing suction filtration to obtain lepidolite lithium extraction tailings;
specifically, the acidic solvent comprises the following components:
the acid solvent comprises 10% nitric acid, 6% salicylic acid, 4% lactic acid and the balance deionized water in percentage by weight.
Comparative example 1
This comparative example is different from example 1 in that,
the lepidolite slag cement is prepared from the following raw materials in parts by weight: 80 parts of cement clinker, 10 parts of lepidolite lithium extraction tailings, 4 parts of desulfurized gypsum and 0.2 part of auxiliary agent;
the auxiliary agent comprises the following components in percentage by weight: 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl ether disulfonate, 5% of silicon nitride, 7% of sodium nitrite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol.
Comparative example 2
This comparative example is different from example 1 in that,
the lepidolite slag cement is prepared from the following raw materials in parts by weight: 80 parts of cement clinker, 10 parts of lepidolite lithium extraction tailings, 4 parts of desulfurized gypsum and 2 parts of auxiliary agent;
the auxiliary agent comprises 80 percent of limestone powder and the balance of grinding aid loaded on the limestone powder in percentage by weight.
Example 2
This embodiment is different from embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl oxide disulfonate, 5% of silicon nitride and the balance of glycol.
Example 3
This embodiment is different from the embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 7% of sodium nitrite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol.
Example 4
This embodiment is different from the embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 10% triethanolamine, 7% ammonium chloride, 9% sodium dodecylbenzenesulfonate, 5% silicon nitride, 7% sodium nitrite, 1.3% fatty acid ester, 1% ethyl methyl carbonate, 0.1% diethanolamine, 0.1% fructose-6-phosphate and the balance of glycol.
Example 5
This embodiment is different from embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 10% triethanolamine, 7% ammonium chloride, 9% sodium dodecyl diphenyl oxide disulfonate, 5% silicon nitride, 7% sodium nitrite, 1.3% fatty acid ester, 1% ethyl methyl carbonate, 0.1% diethanolamine, 0.1% fructose 1,6-bisphosphate and the balance glycol.
Example 6
This embodiment is different from embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl ether disulfonate, 5% of antimony oxychloride, 7% of sodium nitrite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol.
Example 7
This embodiment is different from embodiment 1 in that,
the grinding aid comprises the following components in percentage by weight: 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl ether disulfonate, 5% of silicon nitride, 7% of sodium sulfite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol.
Comparative example 3
This comparative example is different from example 1 in that,
the preparation method of the lepidolite slag cement comprises the following steps:
s1, weighing lepidolite lithium extraction tailings according to a stock preparation ratio, and drying at 100 ℃ to obtain a first treatment material;
s2, after the first treatment material is cooled to room temperature, weighing cement clinker and desulfurized gypsum according to a proportion, mixing the cement clinker and desulfurized gypsum with the cooled first treatment material and the auxiliary agent together to obtain a second treatment material;
s3, ball milling the second treatment material after double rollers until the specific surface area is 380m & lt 2 & gt/Kg to obtain the lepidolite slag cement.
Comparative example 4
This comparative example is different from example 1 in that,
the preparation method of the lepidolite slag cement comprises the following steps:
s1, weighing lepidolite lithium extraction tailings, cement clinker and desulfurized gypsum according to the material preparation proportion, and drying at 100 ℃ to obtain a first treatment material;
s2, cooling the first processing material to room temperature to obtain a second processing material;
and S3, performing ball milling on the second treatment material after the second treatment material passes through a pair of rollers, adding an auxiliary agent during ball milling, and milling until the specific surface area is 380m & lt 2 & gt/Kg to obtain the lepidolite slag cement.
Comparative example 5
This comparative example is different from example 1 in that,
the acidic solvent comprises the following components:
the acid solvent comprises 10% of nitric acid, 6% of salicylic acid, 4% of L-lactic acid and the balance of deionized water in percentage by weight.
Comparative example 6
This comparative example is different from example 1 in that,
the acidic solvent comprises the following components:
the acid solvent comprises, by weight, 10% sulfuric acid, 6% salicylic acid, 4% lactic acid, and the balance deionized water.
Comparative example 7
This comparative example is different from the examples in that,
the preparation method of the lepidolite lithium extraction tailings comprises the following steps:
grinding lepidolite slag to 70 meshes, immersing the lepidolite slag in an acid solvent for 1.5h, and performing solid-liquid separation to obtain a first treatment substance of a solid substance;
the weight ratio of the lepidolite residues to the acidic solvent is 1:2;
mixing the first treated substance with 17.5mol/L acetic acid aqueous solution according to the weight ratio of 1;
stirring and washing the second treatment substance in deionized water at 90 ℃ for 1.5h, performing solid-liquid separation to obtain a solid, washing and soaking the solid in deionized water for 0.5h to neutrality, and performing suction filtration to obtain lepidolite lithium extraction tailings;
sensory tests and time setting tests were carried out on the lepidolite slag cements prepared in examples 1 to 7 and comparative examples 1 to 7, respectively, and the specific results are shown in table 1:
TABLE 1
The lepidolite slag cements prepared in examples 1 to 7 and comparative examples 1 to 7 were tested for flexural strength and compressive strength at 3d and 28d, respectively, and the specific results are shown in table 2:
TABLE 2
Referring to tables 1-2, and the contents of the comparative examples and examples, comparing example 1 with comparative examples 1-2, it can be seen that, in example 1, fly ash is used as a carrier to load a grinding aid, and compared with limestone powder which is used as a carrier and an unloaded grinding aid which is directly used as a raw material of lepidolite slag cement, the obtained lepidolite slag cement has better 3d strength and 28d strength, faster initial setting time and final setting time, reduced rework risk such as cement collapse, better coagulation effect and no agglomeration of lepidolite slag cement;
comparing example 1 with examples 2-7, it is known that in example 1, 10% of triethanolamine, 7% of ammonium chloride, 9% of sodium dodecyl diphenyl oxide disulfonate, 5% of silicon nitride, 7% of sodium nitrite, 1.3% of fatty acid ester, 1% of methyl ethyl carbonate, 0.1% of diethanolamine, 0.1% of fructose-6-phosphoric acid and the balance of glycol are used as grinding aids, so that the lepidolite slag cement can obtain the balance of 3d strength and 28d strength, the setting time meets the construction requirements better, and the agglomeration phenomenon is also improved well;
comparing example 1 with comparative example 3, it can be seen that in example 1, the auxiliary agent is added in the ball milling process after the pair rollers, so that the influence on the properties of the auxiliary agent is reduced, and the quality of the finished product of the lepidolite slag cement is ensured;
comparing example 1 with comparative example 4, it can be seen that comparative example 4 mixes and dries the lepidolite lithium extraction tailings, the cement clinker and the desulfurized gypsum at the same time, which destroys the properties of the cement clinker and the desulfurized gypsum, and therefore, the prepared lepidolite slag cement has lower performance;
comparing example 1 with comparative examples 5-6, it can be seen that the use of the mixture ratio of nitric acid, salicylic acid, lactic acid and deionized water as the acidic solvent for changing the properties of the lepidolite lithium extraction tailings has the best effect, and the lepidolite slag cement obtained by using the mixture ratio has the best performance;
comparing example 1 with comparative example 7, it is known that when the lepidolite residue is modified by using the secondary acid leaching method, the modification effect is better when the lepidolite residue is heated at high temperature, and the mechanical property, the 3d strength and the 28d strength of the finished cement can be better balanced;
as can be seen from the above, example 1 is the most preferable example of the present invention, because the setting time is the best and no agglomeration phenomenon occurs, and the balance between the 3d strength and the 28d strength can be achieved, thereby significantly improving the overall performance of the lepidolite slag cement, compared to the lepidolite slag cements of examples 2 to 7.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. All technical schemes belonging to the idea of the invention belong to the protection scope of the invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention, and such modifications and embellishments should also be considered as within the scope of the invention.
Claims (1)
1. The preparation method of the lepidolite slag cement is characterized by comprising the following raw materials in parts by weight: 70-80 parts of cement clinker, 5-15 parts of lepidolite lithium extraction tailings, 3-5 parts of desulfurized gypsum and 0.5-2 parts of auxiliary agent;
the preparation method comprises the following steps:
s1, weighing lepidolite lithium extraction tailings according to a stock preparation proportion, and drying at 90-100 ℃ to obtain a first treatment material;
s2, after the first treatment material is cooled to room temperature, weighing cement clinker and desulfurized gypsum according to a proportion and mixing the cement clinker and desulfurized gypsum with the cooled first treatment material to obtain a second treatment material;
s3, ball milling the second processing material after double rollers, adding an auxiliary agent during ball milling, and milling until the specific surface area is 300-400m 2 Obtaining the lepidolite slag cement;
wherein, the auxiliary agent comprises 50-90% of fly ash and the balance of grinding aid loaded on the fly ash by weight percentage;
wherein, by weight percentage, the grinding aid comprises: 1-10% of triethanolamine, 1-10% of ammonium chloride, 1-10% of sodium dodecyl diphenyl ether disulfonate, 1-10% of silicon nitride, 1-10% of sodium nitrite, 1-2% of fatty acid ester, 0.2-2% of methyl ethyl carbonate, 0.1-0.2% of diethanolamine, 0.05-0.1% of fructose-6-phosphoric acid and the balance of glycol;
the preparation method of the lepidolite lithium extraction tailings comprises the following steps:
grinding lepidolite slag to 60-80 meshes, immersing the lepidolite slag in an acid solvent for 1-2h, and performing solid-liquid separation to obtain a first treatment substance of a solid substance; wherein, the acid solvent comprises 5-10% of nitric acid, 1-10% of salicylic acid, 1-10% of lactic acid and the balance of deionized water by weight percentage;
the weight ratio of the lepidolite residues to the acidic solvent is 1:1-2;
pre-burning the first treated substance at 100-200 deg.C for 20-90min, and rapidly cooling at-5 deg.C to obtain a second treated substance;
mixing the second treatment substance with 17.5mol/L acetic acid aqueous solution according to the weight ratio of 1.1-0.3, roasting at 800-1200 ℃ for 10-20min, and cooling to obtain a third treatment substance;
stirring and washing the third treated substance in deionized water at 60-100 deg.C for 1-2h, performing solid-liquid separation to obtain solid, washing and soaking in deionized water for 0.5-1h, washing to neutrality, and vacuum filtering to obtain lepidolite lithium extraction tailings.
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| US6500254B1 (en) * | 2000-06-30 | 2002-12-31 | Fmc Corporation | Cements including lithium glass compositions |
| CN1181143C (en) * | 2000-07-26 | 2004-12-22 | 周靖 | Reflecting powder made of tailing of Ta-Nb ore after floatation and lepidolite for highway and its preparing process |
| CN103979809B (en) * | 2014-04-16 | 2015-11-25 | 南昌大学 | Lepidolite extracted lithium slag is utilized to prepare the method for few grog white portland cement |
| CN105439485B (en) * | 2015-12-15 | 2017-05-31 | 华东交通大学 | Lepidolite slag admixture and preparation method and application |
| CN106116189B (en) * | 2016-06-28 | 2018-03-20 | 东南大学 | A kind of no first-hand datum lithium slag composite gelled material |
| CN106915754B (en) * | 2017-05-11 | 2018-03-09 | 江西南氏锂电新材料有限公司 | A kind of lithium carbonate extraction process based on lepidolite ore |
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2022
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