CN116003017A - Method for improving impermeability of lithium slag admixture by using metallurgical wastewater - Google Patents
Method for improving impermeability of lithium slag admixture by using metallurgical wastewater Download PDFInfo
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- CN116003017A CN116003017A CN202310047024.1A CN202310047024A CN116003017A CN 116003017 A CN116003017 A CN 116003017A CN 202310047024 A CN202310047024 A CN 202310047024A CN 116003017 A CN116003017 A CN 116003017A
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- lithium slag
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- lithium
- impermeability
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- 239000002893 slag Substances 0.000 title claims abstract description 108
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 29
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000008139 complexing agent Substances 0.000 claims abstract description 12
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 9
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 9
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 9
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims abstract description 9
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 9
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 9
- 239000011734 sodium Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 14
- 239000003607 modifier Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000004480 active ingredient Substances 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 235000002906 tartaric acid Nutrition 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 abstract description 9
- 238000013329 compounding Methods 0.000 abstract description 3
- 229910052745 lead Inorganic materials 0.000 abstract description 2
- 229910052753 mercury Inorganic materials 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000002253 acid Substances 0.000 description 16
- 238000002386 leaching Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- 239000002910 solid waste Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 9
- 239000012976 trial formulation Substances 0.000 description 9
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 6
- 239000002002 slurry Substances 0.000 description 6
- 238000010998 test method Methods 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 5
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 5
- 229910052808 lithium carbonate Inorganic materials 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 230000003487 anti-permeability effect Effects 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 239000012744 reinforcing agent Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 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 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003472 neutralizing effect Effects 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229910052642 spodumene Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- GRWPEXLRROVDML-UHFFFAOYSA-N [Ca].ClOCl Chemical compound [Ca].ClOCl GRWPEXLRROVDML-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- -1 iron ions Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a method for improving the impermeability of a lithium slag admixture by using metallurgical wastewater. The invention utilizes hydrochloric acid, sulfuric acid, ferric chloride, ferric sulfate and the like in metallurgical wastewater to prepare the modified regulator by compounding aluminum sulfate, sodium fluosilicate and complexing agent, and the modified regulator is added in the process of grinding lithium slag, so that the problems of low strength of the lithium slag concrete and poor adaptability to water reducing agents are solved, the problem of solidification of heavy metals (Hg and Pb) in the metallurgical wastewater is solved, the aim of waste disposal with waste is fulfilled, and the compactness and the impermeability of the lithium slag concrete are improved.
Description
Technical Field
The invention relates to a method for improving the impermeability of a lithium slag admixture by using metallurgical wastewater, belonging to the technical field of building chemicals.
Background
The lithium slag is a byproduct of the process for preparing lithium carbonate by a sulfuric acid method, spodumene is calcined at a high temperature of 1200 ℃, concentrated sulfuric acid is added for roasting, full reaction is carried out,adding clean water into the acidified material after acidification, washing the acidified material with CaCO 3 Neutralizing residual acid to obtain slurry. The leaching solution obtained by stirring and leaching the slurry is subjected to the next working procedure, and the rest is leached slag lithium slag. At present, the most effective and maximum application mode of the lithium slag is to be used as a concrete admixture to be applied to filling gaps of concrete in the concrete to replace a small amount of cement, so that the manufacturing cost of the concrete is reduced. The lithium slag is used as a concrete admixture mainly by utilizing the fact that the lithium slag contains potential active substances (amorphous Al 2 O 3 、SiO 2 ) However, free calcium oxide exists in the lithium slag at the same time, and the application of a large amount of lithium slag as an admixture in concrete can cause the problems of low concrete strength and poor concrete impermeability.
Acid metallurgical wastewater such as acid leaching solution, extraction residual solution, electro-deposition lean solution and the like is generated in the metallurgical process, and the wastewater has strong acidity and contains high-concentration iron ions, sulfate ions and the like. Because the acidic wastewater has stronger corrosiveness, direct discharge can corrode pipelines and structures, and the self-purification of water is interfered, so that soil is acidified. Meanwhile, heavy metals in wastewater can seriously affect the physical health and even life safety of people, and the investment for treating metallurgical wastewater is large, so that a more reasonable solution is needed.
At present, the lithium slag is used as an admixture to realize industrial application in concrete, so that on one hand, the dosage of the polycarboxylic acid water reducer of the concrete is increased, the working performance is improved, and meanwhile, various early strength agents are added, but the polycarboxylic acid water reducer is only used for common concrete with low grade and low durability (impermeability performance), and on the other hand, the lithium slag is used for reducing the dosage of the lithium slag to be applied in the concrete. The common methods for treating metallurgical pickling wastewater include a chemical neutralization method, an ion exchange method, a membrane method and the like, and a large number of equipment are added, but the cost is high.
Therefore, the existing method solves the problems that the application mode of the lithium slag as the admixture in the concrete only uses the lithium slag, but can not solve the problems of large amount of application of the lithium slag in the concrete and poor anti-permeability performance index, and on the other hand, the method has the defect that the quality of the concrete is difficult to control, after the dosage of the polycarboxylic acid water reducer is increased, the concrete is isolated and bleeding to cause the cracking risk of the concrete to be increased, the durability index is reduced, after the reinforcing agent is used, the early strength of the concrete is increased, but the later strength of the concrete is inverted, and more importantly, the existing reinforcing agents in the market at present are all alkaline reinforcing agents, such as inorganic salts and alcohol amines, are all alkaline reinforcing agents and are difficult to adapt to the acidity of the polycarboxylic acid water reducer, so that the quality of the concrete is unstable. The treatment cost of the metallurgical pickling wastewater is high, and the metallurgical pickling wastewater is not effectively recycled. Therefore, a more reasonable treatment mode is needed in the application of the lithium slag additive and the treatment of metallurgical pickling wastewater.
Disclosure of Invention
Aiming at the problems, the invention provides a method for improving the impermeability of the lithium slag admixture by using metallurgical wastewater. The invention utilizes strong acid and salt in metallurgical wastewater to prepare the modified regulator by compounding aluminum sulfate, sodium fluosilicate and complexing agent, and the modified regulator is added in the process of grinding lithium slag, so that the problems of low strength of the lithium slag concrete and poor adaptability to water reducing agents are solved, the problem of solidification of heavy metals (Hg and Pb) in the metallurgical wastewater is solved, the aim of preparing waste from waste is fulfilled, and the compactness and impermeability of the lithium slag concrete are improved.
The invention firstly provides a lithium slag concrete performance regulator, which comprises the following raw materials in percentage by weight: 30-35% of metallurgical wastewater, 12-20% of aluminum sulfate, 10-15% of sodium fluosilicate, 3-5% of complexing agent and 100% of water, and uniformly mixing the above raw materials.
The metallurgical wastewater is prepared by filtering metallurgical waste liquid, filtering out components such as sediment, sludge and the like, and collecting supernatant, wherein the effective components of the supernatant are hydrochloric acid, sulfuric acid, ferric chloride and ferric sulfate, and the metallurgical waste liquid comprises the following effective components in percentage by mass: 5-8% of hydrochloric acid, 9-13% of sulfuric acid, 4-7% of ferric chloride and 4-7% of ferric sulfate.
The complexing agent is EDTA or tartaric acid.
The lithium slag is a byproduct of a process for preparing lithium carbonate by a sulfuric acid method, spodumene is calcined at a high temperature of 1200 ℃, concentrated sulfuric acid is added for roasting, the acidized material after full reaction is added with clean water for washing, and CaCO is used for preparing the lithium carbonate 3 Neutralizing residual acid to obtain slurry. The leaching solution obtained by stirring and leaching the slurry is processed in the next working procedure, the rest is leaching slag lithium slag, and the active ingredient of the leaching slag lithium slag is Al 2 O 3 And SiO 2 The lithium slag comprises the following active ingredients in percentage by mass: al (Al) 2 O 3 18-25％，SiO 2 33-38％。
The invention also provides application of the regulator in improving the impermeability of the lithium slag admixture.
The invention also provides a method for improving the impermeability of the lithium slag admixture by using the metallurgical wastewater, which is characterized in that the regulator prepared by the method is added in the process of grinding the lithium slag powder, and the fineness of the lithium slag powder is 550-700m 2 Per kg, the mixing amount of the regulator is 0.5-0.8%.
The principle of the invention is as follows: (1) The strong acid hydrochloric acid and sulfuric acid contained in the metallurgical waste liquid are combined with the potential active aluminum in the lithium slag, the free calcium hydrated by the cement and the free calcium in the lithium slag to form hydrated calcium sulfoaluminate, calcium chloroaluminate and calcium oxychloride in an alkaline environment, so that the compactness of the concrete is filled, and the impermeability of the concrete is improved; (2) Complexing agent complexes free calcium ions, so that free calcium oxide is consumed, hydration reaction is promoted to continuously proceed to the positive direction, generation of concrete cracks is inhibited, the compactness of the concrete is increased, and the impermeability is improved; the sodium fluosilicate ensures that the concrete has acid resistance; (3) In addition, the heavy metal ions in the metallurgical waste liquid can be solidified in the concrete, so that the problems of impermeability and strength application of the lithium slag concrete are solved, and the problem that heavy metals in the metallurgical waste liquid are difficult to treat is solved. (3) In addition, inorganic salts such as ferric chloride and ferric sulfate in metallurgical waste liquid can improve the compactness of concrete in concrete, can ensure to reduce the dissolution rate of heavy metals, and can lead aluminum sulfate to react rapidly to generate sulfate so as to solve the problem of slow early hydration of lithium slag. The regulator consumes free calcium oxide and improves the durability of the concrete. (4) The modified regulator has acidic pH value, has good adaptability with the polycarboxylic acid water reducer for the lithium slag concrete, improves the flow property of the concrete, and improves the strength.
The invention has the technical effects that:
1. not only fully utilizes the components such as hydrochloric acid, sulfuric acid, ferric chloride, ferric sulfate and the like in the metallurgical waste liquid, but also solves the technical problem of difficult treatment of heavy metal in the metallurgical waste liquid, solidifies the heavy metal in concrete, and greatly reduces the leaching rate of the heavy metal.
2. The invention prepares the modified regulator by using strong acid and salt in metallurgical wastewater, and compounding aluminum sulfate, sodium fluosilicate and complexing agent. Firstly, the pH value of the modified regulator is acidic, the modified regulator has good adaptability with the polycarboxylic acid water reducer for the lithium slag concrete, and the flow property of the concrete is improved; a small amount of ferric salt, calcium salt and the like in the metallurgical waste liquid form a complex to improve the strength in the concrete, so that the problems of low strength of the lithium slag concrete and poor adaptability to the water reducer are solved; and secondly, strong acid hydrochloric acid and sulfuric acid contained in the metallurgical waste liquid are combined with potential active aluminum in lithium slag, free calcium hydrated by cement and free calcium in the lithium slag to form hydrated calcium sulfoaluminate, calcium chloroaluminate and calcium oxychloride in the alkaline environment, so that the compactness of the filled concrete is improved, the impermeability of the concrete is improved, free calcium ions are complexed by a complexing agent, free calcium oxide is consumed, the impermeability and durability are further improved, and the problem of poor durability and impermeability of the lithium slag-based concrete is solved, and the impermeability of the concrete is obviously improved.
3. The experimental results show that the invention has the following advantages: after the lithium slag concrete performance regulator is adopted, the viscosity of the solid waste concrete is reduced, and the fluidity is improved; the strength and the impermeability of the concrete are obviously improved, and the dissolution rate of heavy metal in the concrete is 1/3 of that of the original concrete.
Detailed Description
The invention is further illustrated below with reference to examples.
The metallurgical waste water is prepared by filtering metallurgical waste liquid, filtering out components such as sediment, sludge and the like, and collecting supernatant, wherein the effective components of the supernatant are hydrochloric acid, sulfuric acid, ferric chloride and ferric sulfate, and the metallurgical waste liquid comprises the following effective components in percentage by mass: 5% of hydrochloric acid, 10% of sulfuric acid, 7% of ferric chloride and 7% of ferric sulfate.
Wherein the lithium slag is a byproduct of a process for preparing lithium carbonate by a sulfuric acid method, spodumene is calcined at a high temperature of 1200 ℃, concentrated sulfuric acid is added for roasting, the acidified material is fully reacted, clean water is added for washing, and CaCO is used for preparing the lithium carbonate 3 Neutralizing residual acid to obtain slurry. The leaching solution obtained by stirring and leaching the slurry is processed in the next working procedure, the rest is leaching slag lithium slag, and the active ingredient of the leaching slag lithium slag is Al 2 O 3 And SiO 2 The lithium slag comprises the following two components in percentage by mass: al (Al) 2 O 3 20％，SiO 2 35％。
Example 1: preparation of lithium slag concrete performance regulator
Raw materials (weight ratio): 32.5% of metallurgical wastewater, 16% of aluminum sulfate, 12.5% of sodium fluosilicate, 4% of complexing agent (EDTA) and 100% of water, and uniformly mixing the above raw materials.
The lithium slag concrete performance modifier prepared in example 1 was used in examples 2-4.
Example 2: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of C30 concrete
Preparation of lithium slag powder grinding according to the weight ratio of 100% lithium slag and 0.6% regulator, and specific surface area of 600+50m 2 And/kg, comparing the effect, the proportion and the effect of the concrete before and after the lithium slag performance regulator is added according to the trial formulation of the C30 concrete, wherein the table 1 shows. The slump/expansion degree of concrete is tested according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the anti-permeability performance and the leaching rate of heavy metals are tested according to GB/T50082 Standard of test method for the long-term performance and durability of common concrete.
Table 1: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of C30 concrete
Remarks: (1) 1 and 2 are concrete proportions without adding lithium slag regulator; the comparison 1 and 2 are the concrete proportions added with the lithium slag modifier; (2) The flow performance index detection is slump and expansion respectively; (3) Testing the impermeability of the interior of the concrete by adopting an impermeability pressure index; and (4) testing the compressive strength of the concrete by using the strength index.
Analysis of results: analysis was performed by the above experimental data: (1) After the lithium slag modifier is adopted, the slump and the expansion degree of the concrete are increased, which indicates that the viscosity of the solid waste concrete is reduced and the flow property is improved; (2) After the lithium slag modifier is adopted, the strength of the concrete is obviously improved relative to the standard. (3) The impermeability is obviously improved, which indicates that the solid waste concrete has good compactness, can solidify harmful components and ensures the quality of the solid waste concrete. (4) After the lithium slag regulator is adopted, the dissolution rate of heavy metal in concrete is 1/3 of that of the original concrete.
Example 3: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of the C40 concrete
Preparation of lithium slag powder grinding according to 100% lithium slag plus 0.7% regulator, specific surface area 600 plus 50m 2 And/kg, comparing the effect, the proportion and the effect of the concrete before and after the lithium slag performance regulator is added according to the trial formulation of the C40 concrete, wherein the table 2 shows. The slump/expansion degree of concrete is tested according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the anti-permeability performance and the leaching rate of heavy metals are tested according to GB/T50082 Standard of test method for the long-term performance and durability of common concrete.
Table 2: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of the C40 concrete
Remarks: (1) In the step 1 and the step 2, the lithium slag is the proportion of the concrete without adding the lithium slag regulator; the comparison 1 and 2 are the concrete proportions added with the lithium slag modifier; (2) The flow performance index detection is slump and expansion respectively; (3) Testing the impermeability of the interior of the concrete by adopting an impermeability pressure index; (4) Strength index the concrete 28d was tested for compressive strength.
Analysis of results: from the above experimental data analysis, it can be seen that: (1) After the lithium slag modifier is adopted, the slump and the expansion degree of the concrete are increased, which indicates that the viscosity of the solid waste concrete is reduced and the flow property is improved; (2) After the lithium slag modifier is adopted, the strength of the concrete is obviously improved relative to the standard. (3) The impermeability is obviously improved, which indicates that the solid waste concrete has good compactness, can solidify harmful components and ensures the quality of the solid waste concrete. (4) After the lithium slag regulator is adopted, the dissolution rate of heavy metal in concrete is 1/3 of that of the original concrete.
Example 4: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of C50 concrete
Preparation of lithium slag powder grinding according to 100% lithium slag+0.6wt% regulator, specific surface area 600+50m 2 And/kg, comparing the effect, the proportion and the effect of the concrete before and after the lithium slag performance regulator is added according to the trial formulation of the C50 concrete, wherein the proportion and the effect are shown in Table 3. The slump/expansion degree of concrete is tested according to GB/T50080 Standard of common concrete mixture Performance test method; testing the 28d strength of concrete according to GB/T50081 standard of common concrete mechanical property test method; the anti-permeability performance and the leaching rate of heavy metals are tested according to GB/T50082 Standard of test method for the long-term performance and durability of common concrete.
Table 3: the effect of the concrete before and after the lithium slag performance regulator is mixed according to the trial formulation of C50 concrete
Remarks: (1) In the step 1 and the step 2, the lithium slag is the proportion of the concrete without adding the lithium slag regulator; the comparison 1 and 2 are the concrete proportions added with the lithium slag modifier; (2) The flow performance index detection is slump and expansion respectively; (3) Testing the impermeability of the interior of the concrete by adopting an impermeability pressure index; (4) Strength index the concrete 28d was tested for compressive strength.
Analysis of results: after the experimental data analysis (1) adopts the lithium slag modifier, the slump and the expansion degree of the concrete are increased, which shows that the viscosity of the solid waste concrete is reduced and the flow property is improved; (2) After the lithium slag modifier is adopted, the strength of the concrete is obviously improved relative to the standard. (3) The impermeability is obviously improved, which indicates that the solid waste concrete has good compactness, can solidify harmful components and ensures the quality of the solid waste concrete. (4) After the lithium slag regulator is adopted, the dissolution rate of heavy metal in concrete is 1/3 of that of the original concrete.
Example 5: preparation of lithium slag concrete performance regulator
Raw materials (weight ratio): 35% of metallurgical wastewater, 12% of aluminum sulfate, 15% of sodium fluosilicate, 3% of complexing agent (tartaric acid) and 100% of water, and uniformly mixing the above raw materials.
The using method comprises the following steps: the modifier prepared by the method is added in the process of grinding the lithium slag powder, and the fineness of the lithium slag powder is 550-700m 2 Per kg, the mixing amount of the regulator is 0.5-0.8%.
Example 6: preparation of lithium slag concrete performance regulator
Raw materials (weight ratio): 30% of metallurgical wastewater, 20% of aluminum sulfate, 10% of sodium fluosilicate, 5% of complexing agent (EDTA) and 100% of water, and uniformly mixing the above raw materials.
The using method comprises the following steps: the modifier prepared by the method is added in the process of grinding the lithium slag powder, and the fineness of the lithium slag powder is 550-700m 2 Per kg, the mixing amount of the regulator is 0.5-0.8%.
Claims (8)
1. The lithium slag concrete performance regulator comprises the following raw materials in percentage by weight: 30-35% of metallurgical wastewater, 12-20% of aluminum sulfate, 10-15% of sodium fluosilicate, 3-5% of complexing agent and 100% of water.
2. The lithium slag concrete performance regulator according to claim 1, wherein the metallurgical wastewater is obtained by filtering metallurgical waste liquid, filtering out sediment and sludge, and collecting supernatant, and the effective components are hydrochloric acid, sulfuric acid, ferric chloride and ferric sulfate.
3. The lithium slag concrete performance regulator as claimed in claim 2, wherein the metallurgical waste liquid comprises the following active ingredients in percentage by mass: 5-8% of hydrochloric acid, 9-13% of sulfuric acid, 4-7% of ferric chloride and 4-7% of ferric sulfate.
4. The lithium slag concrete performance modifier of claim 1, wherein the complexing agent is EDTA or tartaric acid.
5. The lithium slag concrete performance regulator as claimed in claim 1, wherein the mass percentage of the active ingredients in the lithium slag is as follows: al (Al) 2 O 3 18-25％，SiO 2 33-38％。
6. Use of the lithium slag concrete performance modifier of any one of claims 1-5 to improve the barrier properties of a lithium slag admixture.
7. A method for improving the impermeability of a lithium slag admixture by using metallurgical wastewater, which is characterized in that the lithium slag concrete performance regulator of any one of claims 1-5 is added in the process of grinding lithium slag.
8. The method for improving the impermeability of a lithium slag admixture using metallurgical wastewater according to claim 7, wherein the fineness of the lithium slag is 550-700m 2 The mixing amount of the lithium slag concrete performance regulator per kg is 0.5-0.8%.
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| CN112079589A (en) * | 2020-09-15 | 2020-12-15 | 中建西部建设西南有限公司 | Modified lithium slag complex mineral admixture and preparation and application thereof |
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| KR20100002710A (en) * | 2008-06-30 | 2010-01-07 | 한국세라믹기술원 | Slag cement composition |
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| WO2011141297A1 (en) * | 2010-05-12 | 2011-11-17 | Umicore | Lithium-bearing slag as aggregate in concrete |
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