CN117185690A - Lithium slag-based baking-free light ceramsite and preparation method and application thereof - Google Patents
Lithium slag-based baking-free light ceramsite and preparation method and application thereof Download PDFInfo
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- CN117185690A CN117185690A CN202311235770.XA CN202311235770A CN117185690A CN 117185690 A CN117185690 A CN 117185690A CN 202311235770 A CN202311235770 A CN 202311235770A CN 117185690 A CN117185690 A CN 117185690A
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 91
- 239000002893 slag Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000292 calcium oxide Substances 0.000 claims abstract description 29
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 29
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 25
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 23
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 17
- 239000011398 Portland cement Substances 0.000 claims description 13
- 239000000919 ceramic Substances 0.000 claims description 12
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 12
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 5
- 210000001161 mammalian embryo Anatomy 0.000 claims description 5
- 229910052642 spodumene Inorganic materials 0.000 claims description 5
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 4
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 4
- 239000001099 ammonium carbonate Substances 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 4
- 239000012774 insulation material Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000012141 concentrate Substances 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims 2
- 239000004566 building material Substances 0.000 abstract description 5
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 8
- 239000011575 calcium Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010881 fly ash Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 210000002257 embryonic structure Anatomy 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Processing Of Solid Wastes (AREA)
Abstract
The invention particularly relates to a lithium slag-based baking-free light ceramsite and a preparation method and application thereof, and belongs to the technical field of building materials. The lithium slag-based baking-free light ceramsite comprises the following raw materials in parts by weight: 60-80 parts of lithium slag, 10-20 parts of cement, 8-15 parts of quicklime, 3-8 parts of alkali-exciting agent, 1-6 parts of foaming agent and 12-20 parts of water. The baking-free light ceramsite prepared by the invention has high cylinder pressure strength, low bulk density and low water absorption rate, and can be applied to ceramsite heat-insulating materials.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a lithium slag-based baking-free light ceramsite, and a preparation method and application thereof.
Background
With the continuous development of the fields of new energy automobiles, energy storage and the like, the market demand of new energy batteries is continuously increased, and each large enterprise is increased in investment, so that the production scale of lithium products is enlarged to meet the market demand. Along with the rapid increase of the demand of lithium products, the process byproduct, namely lithium slag, is piled up, so that serious ecological environment problems are brought.
At present, spodumene lithium extraction residues are mainly used in the building material industries such as cement, concrete and the like. Patent CN103601230a discloses a method for producing chemical raw materials by comprehensively utilizing lithium slag, which obtains calcium chloride, ammonium fluoride, white carbon black, aluminum salt, ammonium sulfate and the like through the steps of reacting lithium slag with hydrochloric acid, filtering and the like. The patent CN 111302708A discloses a comprehensive utilization technology of a large amount of lithium slag waste and an implementation method thereof, and the method utilizes lithium slag, an admixture, an exciting agent, a water reducing agent, a chelating agent and the like to prepare a lithium slag oligomer to replace a common cement-based cementing material. Patent CN 113511848A discloses a comprehensive utilization method of lithium ore byproduct lithium slag, which uses lithium slag and alkali to prepare water glass, and then mixes the residue with fly ash, red mud, cement and sand stone to prepare baking-free bricks. Patent CN 108273826A discloses a full-phase high-value recycling method of lithium slag, and the method obtains pyrophyllite raw materials for glass fibers through size mixing, carbonate reaction and magnetic separation treatment.
The ceramic aggregate is a novel building material, which is prepared by using clay, argillite rock, industrial waste and the like as main raw materials, mixing a small amount of binder, exciting agent and the like, and processing the raw materials into granules and the like. Currently, ceramsite is mainly divided into two types, firing and baking-free. The firing ceramsite has the advantages of complex production process, high cost, high-temperature kiln equipment and the like, and high electricity consumption. The baking-free light ceramsite has the advantages of simple production process flow, low cost and good application prospect.
The ceramsite wall thermal insulation material has the advantages of good thermal insulation, low price, convenient construction and the like, and is a development direction of building energy-saving wall materials. However, if the water absorption rate of the ceramsite is high, the water consumption in the stirring process can be greatly increased, the solidification period of the mortar is destroyed, the mechanical property of the mortar is greatly reduced, hollowness and cracking are extremely easy to generate, and the thermal property and durability of the whole heat preservation system are seriously affected. Patent CN111205061a discloses a preparation method of baking-free high-strength fly ash ceramsite, and the prepared ceramsite has high bulk density and water absorption rate although the ceramsite has high cylinder pressure strength, and cannot be applied to ceramsite heat insulation materials.
Disclosure of Invention
The invention provides a lithium slag-based baking-free light ceramic particle, a preparation method and application thereof, and aims to solve the problem that the existing ceramic particle cannot simultaneously have high cylinder pressure strength, low bulk density and low water absorption. The method adopts the residue of spodumene concentrate after lithium extraction by an acid method as a gel material, and then blends cement, quicklime, an alkali-exciting agent, a foaming agent and water, so that the prepared lithium slag-based baking-free light ceramsite has excellent properties of high cylinder pressure strength, low bulk density and low water absorption.
The invention provides lithium slag-based baking-free light ceramsite, which comprises the following raw materials in parts by weight: 60-80 parts of lithium slag, 10-20 parts of cement, 8-15 parts of quicklime, 3-8 parts of alkali-exciting agent, 1-6 parts of foaming agent and 12-20 parts of water.
In a specific embodiment of the invention, the lithium slag is the residue of spodumene concentrate after lithium extraction by an acid method, and comprises the following components in percentage by weight: siO (SiO) 2 53～59％、Al 2 O 3 21～24％、SO 3 5～9％、CaO 3～6％、Na 2 O 0.3～1.0％、K 2 O 0.2～0.5％、Fe 2 O 3 0.8 to 1.5 percent; the water content of the lithium slag is 10% -25%; the fineness of the lithium slag is 95% that of the lithium slag passes through a 0.3mm sieve pore, and 70% that of the lithium slag passes through a 0.075mm sieve pore.
In the present invention, the chemical composition of the lithium slag is approximately HAlSi 2 O 6 Has a porous structure and a large inner surface area, and silicon and aluminum are mainly amorphous SiO 2 、Al 2 O 3 Therefore, the high-strength cement-free light ceramsite has high volcanic ash activity, can generate secondary hydration reaction with cement to generate hydrated calcium silicate gel, and can reduce the bulk density of the unfired light ceramsite under the condition of ensuring the cylinder pressure.
In one embodiment of the invention, the cement is 425 Portland cement; the effective calcium oxide content of the quicklime is more than 90%.
In the invention, the cement is 425 ordinary silicate cement, has good plasticity and adhesiveness, belongs to an overbased material, and hydrates and separates out a large amount of Ca (OH) 2 The alkaline corrosion lithium slag is utilized to release more SiO 2 、Al 2 O 3 And reacts with the material to improve the activity of lithium slag, and the cement is favorable for material balling and improves the mechanical property of the ceramsite. The quicklime is white powder, the effective calcium oxide content of which is more than 90 percent, is not only an active excitant, but also a main component of a cementing material, and reacts with water to produce Ca (OH) 2 And Ca (OH) is produced 2 Can be combined with SiO in lithium slag 2 、Al 2 O 3 The calcium oxide finally plays a role in the excitation of lithium slag to produce Ca (OH) after the polymerization reaction 2 The excitation of the activity of the lithium slag not only provides a cracking effect, but also provides a calcium source required by hydration of the lithium slag to generate a cementing material.
In one embodiment of the invention, the alkali-activator is one or more of sodium silicate or sodium hydroxide; preferably, the alkali-activated agent is water glass, the modulus of the water glass is 1.5-3, and the concentration is 3-5%.
In one specific embodiment of the invention, the foaming agent is one or more of sodium bicarbonate and ammonium bicarbonate.
The invention also provides a preparation method of the lithium slag-based baking-free light ceramsite, which comprises the following steps:
s1: weighing 60-80 parts of lithium slag, 10-20 parts of cement, 8-15 parts of quicklime, 3-8 parts of alkali-exciting agent, 1-6 parts of foaming agent and 12-20 parts of water according to the weight ratio for standby;
s2: mixing the cement, the quicklime and the foaming agent weighed in the step S1 into a stirrer to stir for 10-30 min, adding lithium slag to stir for 10-20 min again after stirring, and adding water in the stirring process to obtain a mixed material;
s3: delivering the mixed material into a press machine and a disc granulator through a conveyor belt to start granulation, and spraying an alkali excitant to obtain ceramsite blanks;
s4: and (3) placing the granulated ceramsite green embryo in the step (S3) into a curing box for curing or naturally curing to obtain the baking-free light ceramsite.
In a specific embodiment of the invention, in the step S3, the rotating speed of the disc granulator is 30-35 r/min, the inclination angle is 50-60 degrees, and the temperature is 20-40 ℃; the particle size of the haydite green embryo is 5-20 mm.
In a specific embodiment of the invention, in the step S4, the curing temperature of the curing box is 80-100 ℃, the humidity is 85-95%, and the time is 20-24 hours; the natural curing is curing for 27 days under natural conditions.
In one specific embodiment of the invention, the cylinder pressure of the baking-free light ceramsite is 6.37-9.41 MPa, and the bulk density is 614.6-867.3 kg/m 3 The water absorption rate of 24h is 8.7-11.4%.
The invention also provides application of the lithium slag-based baking-free light ceramsite in ceramsite wall thermal insulation materials.
Compared with the prior art, the invention has the following beneficial effects:
1. the lithium slag-based baking-free light ceramsite and the preparation method thereof provided by the invention adopt the main raw materials of lithium slag, so that the resources can be effectively reused, the pollution is reduced, and the ecological environment is protected.
2. The lithium slag used in the invention is spodumene lithium extraction residue, the water content is high, and drying equipment is not needed for preparing the ceramsite.
3. The preparation method of the lithium slag based baking-free light ceramsite provided by the invention does not need sintering, and has the advantages of simple and controllable process flow, low raw material price and low energy consumption; green and environment-friendly, low apparent density, high cylinder pressure intensity and excellent comprehensive performance, can be widely applied to the fields of building materials and heat preservation materials, and has wide application prospect.
Drawings
FIG. 1 is a flow chart of a process for preparing lithium slag based baking-free light ceramsite.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The lithium slag-based baking-free light ceramsite consists of the following components in parts by weight: 70 parts of lithium slag, 15 parts of 425 ordinary Portland cement, 12 parts of quicklime, 6 parts of water glass, 3 parts of sodium bicarbonate and 16 parts of water.
The preparation method of the lithium slag-based baking-free light ceramsite specifically comprises the following steps:
s1, weighing the components for standby according to the parts by weight.
S2, mixing 425 ordinary Portland cement, quicklime and sodium bicarbonate into a stirrer and stirring for 20min to obtain a ready-mixed material, then adding lithium slag and stirring for 10min, and simultaneously adding 16 parts of water according to the same parts by weight in the stirring process to obtain the mixed material.
S3, conveying the mixture into a press and a disc granulator through a conveyor belt to start granulation, spraying 6 parts of water glass according to the same weight part, and controlling the rotating speed of the disc granulator to 33 revolutions per minute, the inclination angle to 55 degrees and the temperature to 30 degrees to prepare ceramsite green embryos with the diameters of 5-20 mm.
S4, placing the ceramic green body formed in the step S3 into a steam curing box for curing for 24 hours, taking out, and curing for 27 days under natural conditions to obtain the lithium slag-based baking-free light ceramsite; wherein the curing temperature of the curing box is 90 ℃ and the humidity is 90%.
Example 2
The lithium slag-based baking-free light ceramsite consists of the following components in parts by weight: 60 parts of lithium slag, 10 parts of 425 ordinary Portland cement, 8 parts of quicklime, 3 parts of sodium hydroxide, 1 part of ammonium bicarbonate and 12 parts of water.
The preparation method of the lithium slag-based baking-free light ceramsite specifically comprises the following steps of.
S1, weighing the components for standby according to the corresponding weight parts.
S2, mixing 425 ordinary Portland cement, quicklime and ammonium bicarbonate into a stirrer and stirring for 20min to obtain a ready-mixed material, then adding lithium slag and stirring for 10min, and simultaneously adding 12 parts of water according to the same parts by weight in the stirring process to obtain the mixed material.
S3, conveying the mixture into a press machine and a disc granulator through a conveyor belt to start granulation, spraying 3 parts of sodium hydroxide according to the same weight part, and controlling the rotating speed of the disc granulator to 33 revolutions per minute, the inclination angle to 55 degrees and the temperature to 30 degrees to prepare ceramsite green embryos with the diameters of 5-20 mm.
S4, placing the ceramic green body formed in the step S3 into a steam curing box for curing for 24 hours, taking out, and curing for 27 days under natural conditions to obtain the lithium slag-based baking-free light ceramsite; wherein the curing temperature of the curing box is 90 ℃ and the humidity is 90%.
Example 3
The lithium slag-based baking-free light ceramsite consists of the following components in parts by weight: 80 parts of lithium slag, 20 parts of 425 ordinary Portland cement, 15 parts of quicklime, 8 parts of alkali-exciting agent (6 parts of sodium silicate and 2 parts of sodium hydroxide), 6 parts of sodium bicarbonate and 20 parts of water.
The preparation method of the lithium slag-based baking-free light ceramsite specifically comprises the following steps of.
S1, weighing the components for standby according to the corresponding weight parts.
S2, mixing 425 ordinary Portland cement, quicklime and sodium bicarbonate into a stirrer and stirring for 20min to obtain a ready-mixed material, then adding lithium slag and stirring for 10min, and simultaneously adding 20 parts of water according to the same parts by weight in the stirring process to obtain the mixed material.
S3, conveying the mixture into a press machine and a disc granulator through a conveyor belt to start granulation, spraying 8 parts of alkali-exciting agent (6 parts of sodium silicate and 2 parts of sodium hydroxide) according to the same weight part, and controlling the rotating speed of the disc granulator to 33 revolutions per minute, the inclination angle to 55 ℃ and the temperature to 30 ℃ to prepare the ceramsite green embryo with the diameter of 5-20 mm.
S4, placing the ceramic green body formed in the step S3 into a steam curing box for curing for 24 hours, taking out, and curing for 27 days under natural conditions to obtain the lithium slag-based baking-free light ceramsite; wherein the curing temperature of the curing box is 90 ℃ and the humidity is 90%.
Example 4
The lithium slag-based baking-free light ceramsite consists of the following components in parts by weight: 70 parts of lithium slag, 15 parts of 425 ordinary Portland cement, 12 parts of quicklime, 6 parts of water glass, 3 parts of sodium bicarbonate and 16 parts of water.
The preparation method of the lithium slag-based baking-free light ceramsite specifically comprises the following steps of.
S1, weighing the components for standby according to the corresponding weight parts.
S2, mixing cement, quicklime and sodium bicarbonate into a stirrer, stirring for 10min to obtain a ready-mixed material, then adding lithium slag, stirring for 10min, and simultaneously adding 16 parts of water in the same weight part in the stirring process to obtain a mixed material.
S3, conveying the mixture into a press machine and a disc granulator through a conveyor belt to start granulation, spraying 6 parts of water glass according to the same weight part, and controlling the rotating speed of the disc granulator to be 30 revolutions per minute, the inclination angle to be 50 degrees, and the temperature to be 20 ℃ to prepare ceramsite green embryos with the diameters of 5-20 mm.
S4, placing the ceramic green body formed in the step S3 into a steam curing box for curing for 20 hours, taking out, and curing for 27 days under natural conditions to obtain the lithium slag-based baking-free light ceramsite; wherein the curing temperature of the curing box is 80 ℃ and the humidity is 85%.
Example 5
The lithium slag-based baking-free light ceramsite consists of the following components in parts by weight: 70 parts of lithium slag, 15 parts of 425 ordinary Portland cement, 12 parts of quicklime, 6 parts of alkali-exciting agent (5 parts of sodium silicate, 1 part of sodium hydroxide), 3 parts of sodium bicarbonate and 16 parts of water.
The preparation method of the lithium slag-based baking-free light ceramsite specifically comprises the following steps of.
S1, weighing the components for standby according to the corresponding weight parts.
S2, mixing 425 ordinary Portland cement, quicklime and sodium bicarbonate into a stirrer and stirring for 30min to obtain a ready-mixed material, then adding lithium slag and stirring for 20min, and simultaneously adding 16 parts of water according to the same parts by weight in the stirring process to obtain the mixed material.
S3, conveying the mixture into a press machine and a disc granulator through a conveyor belt to start granulation, spraying 6 parts of alkali-exciting agent (5 parts of sodium silicate and 1 part of sodium hydroxide) according to the same weight part, and controlling the rotating speed of the disc granulator to be 35 revolutions per minute, the inclination angle to be 60 degrees and the temperature to be 40 degrees so as to prepare ceramsite green blanks with the diameter of 5-20 mm.
S4, placing the ceramic green body formed in the step S3 into a steam curing box for curing for 24 hours, taking out, and curing for 27 days under natural conditions to obtain the lithium slag-based baking-free light ceramsite; wherein the curing temperature of the curing box is 100 ℃ and the humidity is 95%.
Comparative example 1
The baking-free light ceramsite consists of the following components in parts by weight: 70 parts of fly ash, 15 parts of 425 ordinary Portland cement, 12 parts of quicklime, 6 parts of water glass, 3 parts of sodium bicarbonate and 16 parts of water.
The preparation method of the baking-free light ceramsite specifically comprises the following steps of.
S1, weighing the components for standby according to the corresponding weight parts.
S2, mixing 425 ordinary Portland cement, quicklime and sodium bicarbonate into a stirrer and stirring for 20min to obtain a ready-mixed material, then adding fly ash and stirring for 10min, and simultaneously adding 16 parts of water according to the same parts by weight in the stirring process to obtain the mixed material.
S3, conveying the mixture into a press and a disc granulator through a conveyor belt to start granulation, spraying 6 parts of water glass according to the same weight part, and controlling the rotating speed of the disc granulator to 33 revolutions per minute, the inclination angle to 55 degrees and the temperature to 30 degrees to prepare ceramsite green embryos with the diameters of 5-20 mm.
S4, placing the ceramic green bodies formed in the step S3 into a steam curing box for curing for 24 hours, taking out, and curing for 27 days under natural conditions to obtain the baking-free light ceramsite; wherein the curing temperature of the curing box is 90 ℃ and the humidity is 90%.
The baking-free light ceramsite prepared in examples 1 to 5 and comparative example 1 was subjected to performance measurement according to the test method of lightweight aggregate part 2 of the specification GB/T17431 lightweight aggregate and test method thereof, and the measurement results are shown in the following table.
TABLE 1 measurement results of the properties of the baking-free light ceramsite prepared in examples 1-5 and comparative example 1
| Project | Bulk density (kg/m) 3 ) | Cylinder pressure intensity (MPa) | 24h Water absorption (%) |
| Example 1 | 679.4 | 8.35 | 10.5 |
| Example 2 | 867.3 | 9.41 | 8.7 |
| Example 3 | 614.6 | 6.37 | 11.4 |
| Example 4 | 705.5 | 8.66 | 9.2 |
| Example 5 | 661.7 | 8.02 | 9.8 |
| Comparative example 1 | 953.2 | 9.88 | 17.6 |
The water absorption rate for 24 hours is 24 hours of mass water absorption rate.
As is clear from the data in the table, the bulk density of the ceramsite obtained in examples 1 to 5 is 610 to 870kg/m 3 The barrel pressure strength is 6.3-9.5 MPa, and the mass water absorption rate is 8.7-11.4% in 24 h. Compared with the comparative example, the baking-free light ceramsite prepared by the invention has the water absorption rate of 24 hours far lower than that of baking-free light ceramsite prepared by fly ash, the bulk density is also reduced, the cylinder pressure intensity is not greatly changed, and the baking-free light ceramsite has higher application value.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The lithium slag-based baking-free light ceramsite is characterized by comprising the following raw materials in parts by weight: 60-80 parts of lithium slag, 10-20 parts of cement, 8-15 parts of quicklime, 3-8 parts of alkali-exciting agent, 1-6 parts of foaming agent and 12-20 parts of water.
2. The lithium slag based baking-free light ceramsite according to claim 1, wherein the lithium slag is the residue of spodumene concentrate subjected to lithium extraction by a sulfuric acid roasting method, and comprises the following components in percentage by weight: siO (SiO) 2 53～59％、Al 2 O 3 21～24％、SO 3 5～9％、CaO 3～6％、Na 2 O 0.3～1.0％、K 2 O 0.2～0.5％、Fe 2 O 3 0.8 to 1.5 percent; the water content of the lithium slag is 10% -25%; the fineness of the lithium slag is 95% that of the lithium slag passes through a 0.3mm sieve pore, and 70% that of the lithium slag passes through a 0.075mm sieve pore.
3. The lithium slag based baking-free light ceramic particles according to claim 1, wherein the cement is 425 Portland cement; the effective calcium oxide content of the quicklime is more than 90%.
4. The lithium slag based baking-free light ceramsite according to claim 1, wherein the alkali-activator is one or more of sodium silicate or sodium hydroxide; preferably, the alkali-activated agent is water glass, the modulus of the water glass is 1.5-3, and the concentration is 3-5%.
5. The lithium slag based baking-free light ceramsite according to claim 1, wherein the foaming agent is one or more of sodium bicarbonate and ammonium bicarbonate.
6. The preparation method of the lithium slag-based baking-free light ceramsite is characterized by comprising the following steps of:
s1: weighing 60-80 parts of lithium slag, 10-20 parts of cement, 8-15 parts of quicklime, 3-8 parts of alkali-exciting agent, 1-6 parts of foaming agent and 12-20 parts of water according to the weight ratio for standby;
s2: mixing the cement, the quicklime and the foaming agent weighed in the step S1 into a stirrer to stir for 10-30 min, adding lithium slag to stir for 10-20 min again after stirring, and adding water in the stirring process to obtain a mixed material;
s3: delivering the mixed material into a press machine and a disc granulator through a conveyor belt to start granulation, and spraying an alkali excitant to obtain ceramsite blanks;
s4: and (3) placing the granulated ceramsite green embryo in the step (S3) into a curing box for curing or naturally curing to obtain the baking-free light ceramsite.
7. The method for preparing lithium slag based baking-free light ceramsite according to claim 6, wherein in the step S3, the rotating speed of the disc granulator is 30-35 rpm, the inclination angle is 50-60 degrees, and the temperature is 20-40 ℃; the particle size of the haydite green embryo is 5-20 mm.
8. The method for preparing lithium slag based baking-free light ceramsite according to claim 6, wherein in the step S4, the curing temperature of the curing box is 80-100 ℃, the humidity is 85-95%, and the time is 20-24 hours; the natural curing is curing for 27 days under natural conditions.
9. The method for preparing the lithium slag based baking-free light ceramic particles according to claim 6, wherein the baking-free light ceramic particles have a cylinder pressure of 6.37-9.41 MPa and a bulk density of 614.6-867.3 kg/m 3 The water absorption rate of 24h is 8.7-11.4%.
10. The use of the lithium slag based baking-free light ceramsite according to claims 1-9 in ceramsite wall insulation materials.
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