CN107903017B - Ferronickel slag building material and preparation method thereof - Google Patents
Ferronickel slag building material and preparation method thereof Download PDFInfo
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- CN107903017B CN107903017B CN201711326111.1A CN201711326111A CN107903017B CN 107903017 B CN107903017 B CN 107903017B CN 201711326111 A CN201711326111 A CN 201711326111A CN 107903017 B CN107903017 B CN 107903017B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
- C04B28/32—Magnesium oxychloride cements, e.g. Sorel cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a ferronickel slag building material and a preparation method thereof, wherein the ferronickel slag building material comprises the following components in parts by weight: 100 parts of nickel-iron slag building material raw material powder and 10-21 parts of water; the nickel-iron slag building material raw material powder comprises the following components in percentage by mass: 20-94.5% of nickel-iron slag, 0-3.5% of fly ash, 4.4-55% of light-burned magnesia and 0.9-16.9% of magnesium chloride; 0.05-0.5% of defoaming agent, 0-1.5% of water reducing agent and 0.15-2.6% of composite modifier; the blending amount of the current solid waste recycling product is effectively improved, the strength of the ferronickel slag building material is improved, the production cost and difficulty of the ferronickel slag recycling are reduced, the product has no problems of halogen return, efflorescence and the like, the strength is high, and the building material has various forms.
Description
Technical Field
The invention relates to the field of building material preparation, in particular to a ferronickel slag building material and a preparation method thereof.
Background
The ferronickel slag is solid waste slag generated in ferronickel smelting and production of ferronickel from laterite-nickel ore, and is mostly ferronickel alloy smelting slag, at present, 30% of nickel in the world comes from laterite-nickel ore, the annual output of ferronickel smelting from laterite in China can reach 128.56 ten thousand tons of nickel metal, the amount of ferronickel substance is more than 1285 ten thousand tons, and the annual amount of hot melt slag is more than 6000 million tons. With the reduction of high-quality and easy-to-extract nickel sulfide ore resources, the improvement of environmental requirements, the improvement of laterite-nickel ore extraction technology, the influence of factors such as nickel price and the like, the nickel content in laterite-nickel ore production is increased continuously. With the continuous increase of the demand of the nickel market, the scale of producing ferronickel alloy by the pyrometallurgy of the laterite-nickel ore is gradually enlarged, and the discharge amount of ferronickel waste slag (nickel slag for short) from the laterite-nickel ore smelting is gradually increased. The recovery value of valuable metals in the nickel-iron slag is low, the slag discharge amount is large, and the problem of treatment of metallurgical waste slag gradually becomes a big problem. If the solid waste slag is directly discarded, the environment can be seriously damaged, the nickel-iron slag can be scientifically and effectively treated, the harm to the environment and the human health can be reduced, and even a great profit can be obtained from the waste slag.
At present, the treatment mode of the ferronickel slag mainly comprises stockpiling and landfill, which not only occupies land and pollutes environment, but also brings serious challenges to the sustainable development of ferronickel smelting. The research and the utilization of the comprehensive utilization of the ferronickel slag mainly concentrate on the aspects of building material raw materials, mineral wool and the like, and have the defects of low added value of products, small using amount of the ferronickel slag, complex operation, high energy consumption of a treatment process and the like. For example, compared with metallurgical waste slag such as steel slag, blast furnace slag, ferromanganese slag and the like, ferronickel slag has high silicon and magnesium content and low calcium content, wherein the magnesium content is about 30%, the activity is lower, and the stability is poor. The nickel-iron slag can be added into cement clinker to produce cement admixture after being finely ground into micro powder. According to the requirements of national standards of portland cement, the addition amount of the ferronickel slag is less than 8 percent, and the use amount of the ferronickel slag is limited. The technology for manufacturing the microcrystalline glass by using the ferronickel smelting hot melting slag can utilize useful chemical components contained in the smelting slag, but has the disadvantages of complex process, high energy consumption and less usage amount of the ferronickel slag, and can not fundamentally solve the environmental problem caused by the stockpiling of the smelting slag. A process for producing mineral wool fibers by using ferronickel slag researched and developed by Shenyang nonferrous metals research institute. The process adopts an electric furnace to temper and preserve heat of hot slag in the preparation process, can improve the total recovery rate of ferronickel, can save partial energy consumption, but has very high total energy consumption and limited usage amount of ferronickel slag. Therefore, the method for recycling the ferronickel slag with high doping amount and low cost is developed, the complete recycling of the ferronickel slag is realized, the harm to the environment is reduced, the harmlessness of the existing nickel smelting process can be solved, and the purposes of no waste material, no tailings and no public hazard are really realized.
Disclosure of Invention
The invention aims to solve the defects that the activity is low, and a product with qualified strength cannot be prepared by using portland cement in the conventional ferronickel slag recycling process, and the like, and provides a ferronickel slag recycling method with high doping amount and low cost.
The technical scheme adopted by the invention for solving the technical problems is as follows: a ferronickel slag building material comprises the following components in parts by weight: 100 parts of nickel-iron slag building material raw material powder and 10-21 parts of water; the nickel-iron slag building material raw material powder comprises the following components in percentage by mass: 20-94.5% of nickel-iron slag, 0-3.5% of fly ash, 4.3-55% of light-burned magnesia and 0.9-16.9% of magnesium chloride; 0.05-0.5% of defoaming agent, 0-1.5% of water reducing agent and 0.15-2.6% of composite modifier.
Preferably, the light-burned magnesia is light-burned magnesia with the purity of more than 70 percent, and the content of active magnesia in the light-burned magnesia is 45-80 percent; the magnesium chloride is anhydrous magnesium chloride or industrial magnesium chloride hexahydrate with the purity of more than 95 percent.
Preferably, the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 5: 1-9: 1.
Preferably, the defoaming agent is one or more of emulsified silicone oil, a higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane.
Preferably, the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a lignosulfonate water reducing agent and a naphthalene high-efficiency water reducing agent.
Preferably, the composite modifier comprises the following raw material components in parts by weight: 5-40% of phosphoric acid and/or phosphate, 10-80% of sulfate and 0-50% of oxalic acid.
Preferably, the phosphoric acid and the phosphate are industrial phosphoric acid and phosphate with the content of more than 95%, and the sulfate is one or more of ferric sulfate, ferrous sulfate and aluminum sulfate.
The preparation method of the nickel-iron slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into an aqueous solution with the concentration of 20-30%, adding a defoaming agent, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: the composite modifier comprises the following raw materials in parts by weight: 5-40% of phosphoric acid and/or phosphate, 10-80% of sulfate and 0-50% of oxalic acid are dissolved in water;
(3) preparing a modified magnesium cementing material: adding light-burned magnesia powder into the magnesium chloride aqueous solution prepared in the step (1), stirring for 2-5min, adding the composite modifier solution prepared in the step (2), and continuing stirring for 3-5 min;
(4) mixing the aggregate: adding nickel-iron slag and fly ash into the modified magnesium cementing material prepared in the step (3), wherein the addition amount of the nickel-iron slag is 20-95% by weight, and the addition amount of the fly ash is 0-3.5% by weight; fully mixing the nickel-iron slag, the fly ash and the modified magnesium cementing material to obtain raw material powder, supplementing water, and uniformly mixing the materials to obtain nickel-iron slag magnesium cementing composite material slurry, wherein the content of water in 100 parts of raw materials is 10-21 parts;
(5) molding: pouring the slurry obtained in the step (4) into a mold, fully vibrating and molding, curing for 6-24 hours, demolding, and naturally curing after demolding.
Optionally, in the preparation method of the nickel-iron slag building material, the water reducing agent is added in the step (4) before water is added, and the adding amount of the water reducing agent is 0-1.5% by weight.
The invention has the following beneficial effects:
according to the ferronickel slag building material and the preparation method thereof provided by the invention, the doping amount of the ferronickel slag is far higher than that of the existing solid waste recycling product, meanwhile, due to the addition of the modifier, the strength of the ferronickel slag building material is greatly improved, due to the high doping amount and no need of other aggregates, the production cost and the recycling difficulty of the ferronickel slag recycling are greatly reduced, the product prepared by the method has no problems of halogen return, scumming and the like, and the strength can also meet related requirements; the invention has the advantages of high waste doping amount, easy production and blending, no need of special equipment, various building material preparation forms and the like, solves the problem of treatment of the ferronickel slag, can provide building materials for the society, and changes waste into valuable.
Drawings
FIG. 1 is a schematic view of a process flow for preparing a ferronickel slag building material;
Detailed Description
Noun interpretation
The light-burned magnesia is prepared by calcining magnesite, brucite and magnesium hydroxide extracted from seawater or brine at about 700-1000 ℃ to decompose and discharge CO2Or H2And O, namely obtaining the light-burned magnesium oxide.
In the present invention, the "active magnesium oxide" is an average particle diameter<2000 nm; the microscopic morphology is irregular particles or nearly spherical particles or flaky crystals; the activity expressed by citric acid (CAA value) is 12-25 s (the activity is higher when the value is smaller); the activity expressed by iodine absorption value is 80-120 (mgI/100 gMgO); the specific surface is 5-20 m3The specific volume is 6-8.5 mL/g;
a ferronickel slag building material comprises the following components in parts by weight: 100 parts of nickel-iron slag building material raw material powder and 10-21 parts of water; the nickel-iron slag building material raw material powder comprises the following components in percentage by mass: 20-94.5% of nickel-iron slag, 0-3.5% of fly ash, 4.3-55% of light-burned magnesia and 0.9-16.9% of magnesium chloride; 0.05-0.5% of defoaming agent, 0-1.5% of water reducing agent and 0.15-2.6% of composite modifier.
Preferably, the light calcined magnesia is the light calcined magnesia with the purity of magnesia being more than 70 percent, and the rest is impurities generated during calcination, and the impurities do not influence the product performance; the content of active magnesium oxide in the light-burned magnesium oxide is 45-80%, and the balance of the light-burned magnesium oxide is light-burned magnesium oxide with the particle size of 2000-4000 nm, so that the product performance is not affected.
The magnesium chloride is anhydrous magnesium chloride or industrial magnesium chloride hexahydrate with the purity of more than 95 percent; the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 5: 1-9: 1, and the more preferable molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1; the defoaming agent is one or more of emulsified silicone oil, a high-alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane; the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a lignosulfonate water reducing agent and a naphthalene high-efficiency water reducing agent;
preferably, the composite modifier comprises the following raw material components in parts by weight: 5-40% of phosphoric acid and/or phosphate, 10-80% of sulfate and 0-50% of oxalic acid; the phosphoric acid or phosphate is industrial phosphoric acid or phosphate with the content of more than 95%, and the sulfate is one or more of ferric sulfate, ferrous sulfate and aluminum sulfate.
In the raw material powder, the defoaming agent is not required to be prepared, but the addition of the defoaming agent can effectively reduce bubbles in the cementing material, thereby improving the compactness of the building material and increasing the strength; the addition of the composite modifier can improve the mechanical property and the water resistance of the building material, and the addition amount is the preferable addition amount. One problem of the high-doping-amount ferronickel slag building material is that the water addition amount is excessive, and the water reducing agent can reduce the water addition amount as much as possible, so that the mechanical property of the building material is improved.
The preparation method of the nickel-iron slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into an aqueous solution with the concentration of 20-30%, adding a defoaming agent, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: the composite modifier comprises the following raw materials in parts by weight: 5-40% of phosphoric acid and/or phosphate, 10-80% of sulfate and 0-50% of oxalic acid are dissolved in water;
(3) preparing a modified magnesium cementing material: adding light-burned magnesium oxide into the magnesium chloride aqueous solution prepared in the step (1), stirring for 2-5min, adding the composite modifier solution prepared in the step (2), and continuing stirring for 3-5 min;
(4) mixing the aggregate: adding the nickel-iron slag and the fly ash into the modified magnesium cementing material prepared in the step (3), fully mixing, supplementing water, and keeping the ratio of water to raw material powder to be 0.10-0.21 by weight, and continuously stirring for 3-10min to uniformly mix the materials to obtain the magnesium cementing composite material slurry of the nickel-iron slag;
(5) molding: pouring the slurry obtained in the step (4) into a mold, fully vibrating and molding, curing for 6-24 hours, demolding, and naturally curing after demolding.
Preferably, in the preparation method of the nickel-iron slag building material, the water reducing agent is added in the step (4) before water is added, and the adding amount of the water reducing agent is 0-1.5% by weight.
The technical solution of the present invention is further described below with reference to the following embodiments and the accompanying drawings.
Example 1
As shown in fig. 1, a method for preparing a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into an aqueous solution with the concentration of 26%, adding 1.5g of emulsified silicone oil defoaming agent by mass fraction, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: dissolving 1.95g of phosphoric acid and 3.9g of ferrous sulfate in 34.15g of water, and uniformly stirring to prepare 40g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 195g of light-burned magnesium oxide into 156g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 40g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: 1219g of nickel-iron slag is added into the modified magnesium cementing material prepared in the step (3), fully mixed, supplemented with water to ensure that the water-cement ratio is 0.10, and continuously stirred for 5min to fully mix the materials to obtain the magnesium cementing composite material slurry of the nickel-iron slag;
(5) molding: and (4) pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 83.5 percent, and the compressive strength of the ferronickel slag in 7 days is 16.4MPa by testing.
Example 2
As shown in fig. 1, a method for preparing a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into a 28% aqueous solution, adding 4.5g of high-carbon alcohol fatty acid compound defoaming agent, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: dissolving 2g of phosphoric acid, 4g of ferric sulfate and 0.4g of oxalic acid in 33.6g of water, and uniformly stirring to prepare 40g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 240g of light-burned magnesium oxide into 178g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 40g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: adding 1200g of nickel-iron slag and 20g of fly ash into the slurry prepared in the step (3), fully mixing, supplementing water until the water-cement ratio is 0.14, and continuously stirring for 5min to fully mix the materials to obtain the magnesium gel composite material slurry of the nickel-iron slag;
(5) molding: and (4) pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 80 percent, and the compressive strength of the ferronickel slag in 7 days is 21.4MPa by testing.
Example 3
As shown in fig. 1, a method for preparing a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into a 20% aqueous solution, adding 7.8g of polydimethylsiloxane defoamer in mass fraction, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: 0.0.039g of ferrous phosphate, 0.624g of aluminum sulfate and 0.117g of oxalic acid are dissolved in 35g of water, and the mixture is uniformly stirred to prepare 35.78g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 854.7g of light-burned magnesium oxide into 1130g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 35.78g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: adding 310.8g of the nickel-iron slag into the slurry prepared in the step (3), fully mixing, supplementing water until the water-cement ratio is 0.21, and continuously stirring for 5min to fully mix the materials to obtain the magnesium gel composite material slurry of the nickel-iron slag;
(5) molding: and (4) pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 5: 1.
The calculated adding amount of the ferronickel slag in the formula is 71.9 percent, and the compressive strength of the ferronickel slag in 7 days is 28.7MPa by testing.
Example 4
As shown in fig. 1, a method for preparing a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into an aqueous solution with the concentration of 23%, adding 0.76g of polyoxypropylene polyoxyethylene glycerol ether defoamer, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: 1.8g of ferrous phosphate, 0.45g of aluminum sulfate and 2.25g of oxalic acid are dissolved in 35.5g of water and evenly stirred to prepare 40g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 122.7g of light-burned magnesium oxide into 90.8g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 40g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: 1363.5g of ferronickel slag is added into the slurry prepared in the step (3), fully mixed, added with 0.76g of naphthalene-based superplasticizer, supplemented with water to ensure that the water-cement ratio is 0.17, and continuously stirred for 5min to fully mix the materials to obtain the magnesian cementitious composite material slurry of the ferronickel slag;
(5) molding: and (4) pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 9: 1.
The calculated adding amount of the ferronickel slag in the formula is 88.3 percent, and the compressive strength of the ferronickel slag in 7 days is 10.1MPa by testing.
Example 5
As shown in fig. 1, a method for preparing a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into an aqueous solution with the concentration of 20%, adding 4.5g of polyoxyethylene polyoxypropylene pentaerythritol ether defoamer, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: dissolving 0.6g of phosphoric acid, 0.4g of sodium dihydrogen phosphate and 0.3g of oxalic acid in 30g of water, and uniformly stirring to prepare 31.2g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 71.3g of light-burned magnesium oxide into 74.1g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 31.2g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: adding 1500g of nickel-iron slag into the slurry prepared in the step (3), fully mixing, supplementing water to enable the water-cement ratio to be 0.12, continuing stirring for 5min, and fully mixing the materials to obtain the magnesium gel composite material slurry of the nickel-iron slag;
(5) molding: and (4) pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 5: 1.
The calculated adding amount of the ferronickel slag in the formula is 94.4 percent, and the compressive strength of the ferronickel slag in 7 days is 3.6MPa by tests.
Example 6
The preparation method of the ferronickel slag building material provided in the embodiment 6 is completely consistent with the embodiment 1 except that the polyoxyethylene polyoxypropylene pentaerythritol ether added in the step (1) in the embodiment 1 is changed into polyoxyethylene polyoxypropylene amine ether.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 83.5 percent, and the compressive strength of the ferronickel slag in 7 days is 17.0MPa by testing.
Example 7
The preparation method of the ferronickel slag building material provided in example 7 is completely the same as that of example 1 except that the polyoxyethylene polyoxypropylene pentaerythritol ether added in step (1) in example 1 is changed to polyoxypropylene glycerol ether.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 83.5 percent, and the compressive strength of the ferronickel slag in 7 days is 17.5MPa by testing.
Example 8
The preparation method of the ferronickel slag building material provided in embodiment 8, wherein the preparation of the composite modifier solution in step (2) changes phosphoric acid into phosphate and ferrous sulfate into ferric sulfate, and the rest is completely the same as that in embodiment 1.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 83.5 percent, and the compressive strength of the ferronickel slag in 7 days is 16.1MPa by testing.
Example 9
The method for preparing a ferronickel slag building material provided in embodiment 9, wherein the preparation of the composite modifier solution in step (2) changes ferrous sulfate into aluminum sulfate, and the rest is completely the same as that in embodiment 1.
Wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
The calculated adding amount of the ferronickel slag in the formula is 83.5 percent, and the compressive strength of the ferronickel slag in 7 days is 16.3MPa by testing.
Comparative example 1
And (3) fully mixing 300g of Portland cement with the model of 4.25R, 1500g of ferronickel slag and 300g of water, pouring the obtained slurry into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, demoulding after curing for 24 hours, and naturally curing for 7 days after demoulding.
The calculated mixing amount of the ferronickel slag is 83.3 percent, and the compressive strength of the ferronickel slag in 7 days is 11.2MPa by test
The results of comparing the solid waste blending amounts and compressive strengths of examples 1-9 with those of comparative example 1 are shown in the following table:
comparison of solid waste mixing amount and compressive strength of examples and comparative examples
As can be seen from the examples and the comparative examples, the ferronickel slag building material has the advantages of high waste doping amount, high material strength, low production cost, easy production and blending, no need of special equipment, application to the preparation of different building materials aiming at products with different compressive strengths, various forms of the building materials and solving the problem of treatment of ferronickel slag.
The sequence of the above embodiments is only for convenience of description and does not represent the advantages and disadvantages of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (1)
1. A preparation method of a ferronickel slag building material comprises the following steps:
(1) preparing magnesium chloride brine: preparing the magnesium chloride into a 28% aqueous solution, adding 4.5g of high-carbon alcohol fatty acid compound defoaming agent, and fully stirring to eliminate foam of the magnesium chloride solution to obtain a clear solution;
(2) preparation of composite modifier solution: dissolving 2g of phosphoric acid, 4g of ferric sulfate and 0.4g of oxalic acid in 33.6g of water, and uniformly stirring to prepare 40g of composite modifier solution;
(3) preparing a modified magnesium cementing material: adding 240g of light-burned magnesium oxide into 178g of the magnesium chloride solution prepared in the step (1), stirring for 5min, then adding 40g of the composite modifier solution prepared in the step (2), and continuing stirring for 3min to fully mix the materials;
(4) mixing the aggregate: adding 1200g of nickel-iron slag and 20g of fly ash into the slurry prepared in the step (3), fully mixing to obtain raw material powder, supplementing water, wherein the weight ratio of water to the raw material powder is 0.14, and continuously stirring for 5min to fully mix the materials to obtain magnesium gel composite material slurry of the nickel-iron slag;
(5) molding: pouring the slurry prepared in the step (4) into a standard test mould with the size of 40 × 160mm, fully vibrating and forming, curing for 24 hours, demoulding, and naturally curing; wherein the molar ratio of the active magnesium oxide to the magnesium chloride in the light-burned magnesium oxide is 7: 1.
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| CN201711326111.1A CN107903017B (en) | 2017-12-13 | 2017-12-13 | Ferronickel slag building material and preparation method thereof |
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| CN107903017B true CN107903017B (en) | 2020-08-21 |
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| CN108409283A (en) * | 2018-04-18 | 2018-08-17 | 安溪中科镁基科技有限公司 | Using sea sand as composite architectural materials of aggregate and preparation method thereof |
| CN108569886A (en) * | 2018-04-18 | 2018-09-25 | 安溪中科镁基科技有限公司 | Alkaline residue aglite composite architectural materials and preparation method thereof |
| CN108793866B (en) * | 2018-06-12 | 2021-01-12 | 扬州一川镍业有限公司 | Ferronickel slag building material and preparation method thereof |
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| CN109251004A (en) * | 2018-11-15 | 2019-01-22 | 中科镁基（北京）科技有限公司 | It is a kind of with carbon chromium slag be main aggregate high-strength concrete and preparation method thereof |
| CN110204312A (en) * | 2019-06-25 | 2019-09-06 | 江苏赛清科技有限公司 | A kind of preparation method of ferronickel dregs porcelain granule |
| CN110713374A (en) * | 2019-11-21 | 2020-01-21 | 衡阳县海华水泥有限责任公司 | Ferronickel slag-based magnesium phosphate cement and preparation method thereof |
| CN111116125B (en) * | 2020-01-14 | 2021-08-17 | 淮阴工学院 | Modification treatment method of ferronickel slag aggregate |
| CN115745563A (en) * | 2022-12-09 | 2023-03-07 | 沈阳工业大学 | Quick repairing material for cement concrete pavement and preparation method |
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