CN110156427A - A kind of unburned functionally gradient composite haydite of engineering waste soil and preparation method thereof - Google Patents

A kind of unburned functionally gradient composite haydite of engineering waste soil and preparation method thereof Download PDF

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Publication number
CN110156427A
CN110156427A CN201910312008.4A CN201910312008A CN110156427A CN 110156427 A CN110156427 A CN 110156427A CN 201910312008 A CN201910312008 A CN 201910312008A CN 110156427 A CN110156427 A CN 110156427A
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waste soil
engineering waste
phosphate cement
magnesium phosphate
potassium magnesium
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CN110156427B (en
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温小栋
张盛楠
冯蕾
张振亚
冉泽
孙华强
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Ningbo University of Technology
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Ningbo University of Technology
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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
    • C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
    • C04B12/02—Phosphate cements
    • 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
    • C04B28/34—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 cold phosphate binders
    • C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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 unburned functionally gradient composite haydites of a kind of engineering waste soil and preparation method thereof, feature is that the haydite solid component is made of engineering waste soil, green potassium magnesium phosphate cement and wood powder and engineering waste soil and green potassium magnesium phosphate cement consumption are changed in gradient by kernel to shell, engineering waste soil dosage is successively reduced by engineering waste soil and green potassium magnesium phosphate cement gross mass 5 ~ 10%, and green potassium magnesium phosphate cement consumption is successively increased by engineering waste soil and green potassium magnesium phosphate cement gross mass 5 ~ 10%；Keep the two gross mass constant simultaneously, the haydite kernel solid component is calculated by weight as 80-86 parts of engineering waste soil, 11-16 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, and shell solid component is calculated by weight as 15-20 parts of engineering waste soil, 76-82 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, advantage is that have water purification and nitrogen phosphorus absorption property, while having higher-strength and water resistance again.

Description

A kind of unburned functionally gradient composite haydite of engineering waste soil and preparation method thereof
Technical field
The present invention relates to architecture engineering material technical fields, and in particular to a kind of unburned functionally gradient of engineering waste soil is compound Haydite and preparation method thereof.
Background technique
A large amount of engineering waste soils of output mainly use stacking mode in Process of Urban Development at present, easily cause surrounding enviroment Pollution, while also causing large amount of land resources occupied, it is unfavorable for the ecodevelopment of green city；Meanwhile sponge urban construction It is badly in need of a large amount of water body to regulate and store and purifying functional-material.For this purpose, utilizing works waste soil is prepared with adsorption filtration function Unburned ecology haydite is used for sponge urban construction, is the important channel for realizing engineering waste soil resource utilization, unburned technology The characteristics of embodying energy conservation and environmental protection.
Existing patent is more to prepare sintering ceramsite with discarded soil, prepares Lightweight ceramic using dregs as patent name is a kind of The method of grain, number of patent application 201710204695.9；Patent name river and lake pool gushes bed mud carbonization haydite and its preparation process, specially Sharp application number 201610674974.7；A kind of method for preparing light ceramic using underground railway track dregs of patent name, patent Shen It please numbers 201610494795.5；A kind of efficiently sound absorption haydite of patent name, number of patent application 201210153470.2.
In addition, being related to baking-free ceramicite on a small quantity, such as a kind of track shield dregs of patent name haydite free of calcining and steam curing and its preparation Method, number of patent application 201510096915.1；Patent name baking-free ceramicite, number of patent application 201210492175.X.Tradition These discarded soil matrix baking-free ceramicites have that low energy consumption, the good characteristics such as at low cost, but there is also intensity low, poor water resistance etc. Disadvantage, and with the increase of waste soil dosage, disadvantage is more obvious；Do not have water body simultaneously to regulate and store and purification function.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind to have water purification performance and nitrogen phosphorus absorption property, while having again There is unburned functionally gradient composite haydite of the engineering waste soil of higher-strength and water resistance and preparation method thereof.
The technical scheme of the invention to solve the technical problem is: a kind of unburned functionally gradient of engineering waste soil is multiple Haydite is closed, the solid component of the unburned functionally gradient composite haydite of the engineering waste soil is by engineering waste soil, green potassium magnesium phosphate water Mud and wood powder are constituted, and engineering waste soil and green potassium magnesium phosphate cement consumption are changed in gradient by kernel to shell, wherein institute The engineering waste soil dosage stated successively is reduced by engineering waste soil with the 5 ~ 10% of green potassium magnesium phosphate cement gross mass, described Green potassium magnesium phosphate cement consumption is successively increased by engineering waste soil with the 5 ~ 10% of green potassium magnesium phosphate cement gross mass；Meanwhile Keep engineering waste soil and green potassium magnesium phosphate cement gross mass constant, in the unburned functionally gradient composite haydite of the engineering waste soil The solid component of core is calculated by weight as: 80-86 parts of engineering waste soil, 11-16 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, And the solid component of its shell is calculated by weight as: 15-20 parts of engineering waste soil, 76-82 parts of potassium magnesium phosphate cement and wood powder 3-5 parts.
The engineering waste soil is nature dried bean noodles soil and grinding 20-30min in the ball mill.
The green potassium magnesium phosphate cement by it is low-grade containing magnesium resource and potassium dihydrogen phosphate be by weight (2.5- 3.5): 1 ratio mixes.
It is described it is low-grade containing magnesium resource be by weight (9-9.5) by magnesium oxide flue gas desulfurization waste residue and boron mud: 1 it is mixed It closes, calcines 3-4h at 1200-1350 DEG C, be cooled to room temperature, and through obtained by ball mill grinding, granularity is in 150-250 Mesh.
The magnesium oxide flue gas desulfurization waste residue is wet oxidation magnesium processes flue gas desulfurization byproduct, and content of magnesia is greater than 40%, the boron mud is the waste residue for producing boric acid or tincal product.
The wood powder is poplar wood powder and granularity is 120 mesh.
The preparation method of the above-mentioned unburned functionally gradient composite haydite of engineering waste soil, comprising the following steps:
1) low-grade to be prepared containing magnesium resource: to be by weight (9-9.5) by magnesium oxide flue gas desulfurization waste residue and boron mud: 1 ratio It is uniformly mixed, calcines 3-4h at 1200-1350 DEG C, it is levigate to 150-250 mesh, system through ball mill grinding after being cooled to room temperature It obtains low-grade spare containing magnesium resource；
2) green potassium magnesium phosphate cement preparation: contain magnesium resource and potassium dihydrogen phosphate by weight for low-grade obtained in step 1) For (2.5-3.5): 1 ratio is uniformly mixed, and it is spare to be prepared into green potassium magnesium phosphate cement；
3) haydite ingredient: weighing engineering waste soil, green potassium magnesium phosphate cement and wood powder by formula rate, agitated to be uniformly made Solid mixture, it is spare；Water is weighed in the ratio of solid mixture gross mass 15-22%, it is spare；The wherein solid of composite haydite Component is changed in gradient by kernel to shell, and engineering waste soil dosage is by engineering waste soil and the total matter of green potassium magnesium phosphate cement The 5 ~ 10% of amount are successively reduced, and green potassium magnesium phosphate cement consumption is by engineering waste soil and the 5 of green potassium magnesium phosphate cement gross mass ~ 10% successively increases；Meanwhile keeping engineering waste soil and green potassium magnesium phosphate cement gross mass constant, composite haydite kernel is consolidated Body component is calculated by weight as: 80-86 parts of engineering waste soil, 11-16 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, and outside it The solid component of shell is calculated by weight as: 15-20 parts of engineering waste soil, 76-82 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder；
4) feeding, balling-up: by the feeding system of computer program-control by the prepared solid mixture of step 3) to disc type balling-up Machine continuous feeding, and be continuously sprayed at water weighed in step 3) in solid mixture in 2 ~ 5min, in dribbling balling machine Middle granulation balling-up；
5) it conserves, sieve: the good composite haydite of balling-up being placed in 18-22 DEG C, is conserved in the wet environment of relative humidity >=95% It after 7 days, is sieved, obtains the unburned functionally gradient composite haydite of engineering waste soil that particle size range is 5-20mm.
Compared with the prior art, the advantages of the present invention are as follows:
1) present invention using engineering waste soil, it is low-grade containing magnesium resource as the primary raw material of baking-free ceramicite, " waste recycling " facilitates The utilization of resources of waste, also reduces production cost；
2) with functionally graded material theory, haydite is changed the present invention in gradient by kernel to shell amounts of components, solves engineering Contradiction between waste soil resource utilization and haydite intensity, water resistance, and avoid the interface of traditional sandwich composite haydite Problem.Engineering waste soil content is higher in usual haydite, potassium magnesium phosphate cement content is lower, and intensity and the water resistance of haydite are got over Difference, but wasted resources rate is higher, therefore haydite of the invention is reduced by kernel to shell engineering waste soil concentration gradients, phosphorus Sour potassium magnesium cement content gradient increases, and using shell protection, improves the intensity and water resistance of whole haydite, while not reducing discarded Resource utilization.Functionally gradient composite haydite, sandwich composite haydite are respectively placed under high/low temperature cyclical acceleration ageing environment Carry out 50 periods of -5 DEG C/40 DEG C alternative cycles after, functionally gradient composite haydite loss of strength rate be 10%, coefficient of softing 0.92, Sandwich composite haydite loss of strength rate is 40%, coefficient of softing 0.82, is shown relative to sandwich composite haydite, functionally gradient Composite haydite has better ageing-resistant performance；
3) present invention realizes pottery by centrifugal force in the component continuous feeding system and dribbling balling machine disk under computer program-control The component continuous gradient variation of grain；
4) present invention to form gelinite hydrated product (gelinite with phosphatic react containing magnesia in magnesium resource using low-grade With biggish specific surface area, there can be the condensation of plasticity slurry state to harden into Shi Zhuanti, and can be integral by cementing, into And improve intensity), precipitating consolidation engineering waste soil；The phosphorus in low-grade magnesia and sewage containing in magnesium resource is utilized simultaneously Acid group, ammonium root reaction, reduce nitrogen and phosphorus content；
5) functionally gradient composite haydite technical indicator is particle size range 5-20mm；Bulk density 600-800kg/m3；Cylindrical compress strength More than 3.0MPa；1h water absorption rate 15%-25%；28 days 0.85 or more coefficient of softing；80% or more ammonia nitrogen place to go rate, phosphorus removal efficiency Up to 95% or more.
In conclusion a kind of unburned functionally gradient composite haydite of engineering waste soil of the present invention and preparation method thereof, resource benefit It is simple with rate height, preparation process, it consumes energy low, product quality is high, has the water purification performance and nitrogen phosphorus absorption property of characteristic, while energy Utilizing works waste soil has the baking-free ceramicite of higher-strength and water resistance again to a greater extent.
Detailed description of the invention
Fig. 1 is a kind of unburned functionally gradient composite haydite structural schematic diagram of engineering waste soil of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The dribbling balling machine that the present invention uses is the conventional use of dribbling balling machine of commercially available industry.
Embodiment 1
A kind of solid component of the unburned functionally gradient composite haydite of engineering waste soil is by engineering waste soil, green potassium magnesium phosphate cement And wood powder is constituted, and engineering waste soil, green potassium magnesium phosphate cement consumption are changed in gradient by kernel to shell, as shown in Figure 1, I.e. engineering waste soil dosage is successively reduced by engineering waste soil with the 10% of green potassium magnesium phosphate cement gross mass, green potassium phosphate Magnesium cement consumption is successively increased by engineering waste soil with the 10% of green potassium magnesium phosphate cement gross mass；Keep engineering discarded simultaneously Soil and green potassium magnesium phosphate cement gross mass are constant.Wherein, the solid material of kernel is calculated by weight as: engineering waste soil 80 Part, 16 parts of potassium magnesium phosphate cement and 4 parts of wood powder.The solid component of shell is calculated by weight as: 20 parts of engineering waste soil, phosphoric acid 76 parts and 4 parts of wood powder of potassium magnesium cement.Preparation method includes the following steps:
1) low-grade to be prepared containing magnesium resource: magnesium oxide flue gas desulfurization waste residue and boron mud are uniformly mixed by weight the ratio of 9:1, 3h is calcined at 1350 DEG C, it is levigate to 200 mesh through ball mill grinding after being cooled to room temperature, it is made low-grade spare containing magnesium resource；
2) green potassium magnesium phosphate cement preparation: contain magnesium resource and potassium dihydrogen phosphate by weight for low-grade obtained in step 1) The ratio of 3:1 is uniformly mixed, and it is spare to be prepared into green potassium magnesium phosphate cement；
3) haydite ingredient: weighing engineering waste soil, green potassium magnesium phosphate cement and wood powder by above-mentioned formula rate, agitated uniform Solid mixture is made, it is spare；Water is weighed in the ratio of solid mixture gross mass 17%, it is spare；
4) feeding, balling-up: by the feeding system of computer program-control by the resulting solid mixture of step 3) to dribbling balling machine Continuous feeding, and be continuously sprayed at water weighed in step 3) in solid mixture in 5min, it is made in dribbling balling machine Grain balling-up；
5) it conserves, sieve: the good haydite of balling-up being placed in 18-22 DEG C, is supported in the wet environment of relative humidity (RH) >=95% Shield is sieved after 7 days, obtains the product of particle size range 5-20mm.Gained baking-free ceramicite sample is detected: haydite holds Weight is 780kg/m3, cylindrical compress strength 4.2MPa, 1h water absorption rate is 18.38%, 28 days coefficient of softing 0.92, ammonia nitrogen place to go rate Up to 85.1%, phosphorus removal efficiency is up to 99.6%.
In this particular embodiment, engineering waste soil is native for nature dried bean noodles, and grinding 30min in the ball mill；Wood powder is Poplar wood powder, 120 mesh of granularity.Magnesium oxide flue gas desulfurization waste residue is wet oxidation magnesium processes flue gas desulfurization byproduct, content of magnesia Greater than 40%.Boron mud is the waste residue for producing boric acid, tincal product.
Embodiment 2
A kind of solid component of the unburned functionally gradient composite haydite of engineering waste soil is by engineering waste soil, green potassium magnesium phosphate cement And wood powder is constituted, and engineering waste soil, green potassium magnesium phosphate cement consumption are changed in gradient by kernel to shell, it may be assumed that engineering is useless Spoir dosage is successively reduced by engineering waste soil with the 7% of green potassium magnesium phosphate cement gross mass, green potassium magnesium phosphate cement consumption It is successively increased by engineering waste soil with the 7% of green potassium magnesium phosphate cement gross mass；Engineering waste soil and green phosphoric acid are kept simultaneously Potassium magnesium cement gross mass is constant.Wherein, the solid material of kernel is calculated by weight as: 86 parts of engineering waste soil, potassium magnesium phosphate 11 parts and 5 parts of wood powder of cement；The solid component of shell is calculated by weight as: 15 parts of engineering waste soil, potassium magnesium phosphate cement 82 Part and 5 parts of wood powder.Preparation method includes the following steps:
1) low-grade to be prepared containing magnesium resource: magnesium oxide flue gas desulfurization waste residue and boron mud are mixed by weight the ratio of 9.5:1 It is even, 4h is calcined at 1200 DEG C, it is levigate to 250 mesh through ball mill grinding after being cooled to room temperature, it is made low-grade standby containing magnesium resource With；
2) green potassium magnesium phosphate cement preparation: contain magnesium resource and potassium dihydrogen phosphate by weight for low-grade obtained in step 1) The ratio of 3.5:1 is uniformly mixed, and it is spare to be prepared into green potassium magnesium phosphate cement；
3) haydite ingredient: weighing engineering waste soil, green potassium magnesium phosphate cement and wood powder by above-mentioned formula rate, agitated uniform Solid mixture is made, it is spare；Water is weighed in the ratio of solid mixture gross mass 22%, it is spare；
4) feeding, balling-up: by the feeding system of computer program-control by the resulting solid mixture of step 3) to dribbling balling machine Continuous feeding, and be continuously sprayed at water weighed in step 3) in solid mixture in 2min, it is made in dribbling balling machine Grain balling-up；
5) it conserves, sieve: the good haydite of balling-up being placed in 18-22 DEG C, is conserved in the wet environment of relative humidity (RH) >=95% It after 7 days, is sieved, obtains the product of particle size range 5-20mm.Gained baking-free ceramicite sample is detected: haydite bulk density For 620kg/m3, cylindrical compress strength 3.2MPa, 1h water absorption rate is 25%, and 28 days coefficient of softing 0.85, ammonia nitrogen place to go rate reaches 83.1%, phosphorus removal efficiency is up to 98.1%.
In this particular embodiment, engineering waste soil is native for nature dried bean noodles, and grinding 20min in the ball mill；Wood powder is Poplar wood powder, 120 mesh of granularity.Magnesium oxide flue gas desulfurization waste residue is wet oxidation magnesium processes flue gas desulfurization byproduct, content of magnesia Greater than 40%.Boron mud is the waste residue for producing boric acid, tincal product.
Embodiment 3
A kind of solid component of the unburned functionally gradient composite haydite of engineering waste soil is by engineering waste soil, green potassium magnesium phosphate cement And wood powder is constituted, and engineering waste soil, green potassium magnesium phosphate cement consumption are changed in gradient by kernel to shell, it may be assumed that engineering is useless Spoir dosage is successively reduced by engineering waste soil with the 5% of green potassium magnesium phosphate cement gross mass, green potassium magnesium phosphate cement consumption It is successively increased by engineering waste soil with the 5% of green potassium magnesium phosphate cement gross mass；Engineering waste soil and green phosphoric acid are kept simultaneously Potassium magnesium cement gross mass is constant.Wherein, the solid material of kernel is calculated by weight as: 82 parts of engineering waste soil, potassium magnesium phosphate 15 parts and 3 parts of wood powder of cement；The solid component of shell is calculated by weight as: 17 parts of engineering waste soil, potassium magnesium phosphate cement 80 Part and 3 parts of wood powder.Preparation method includes the following steps:
1) low-grade to be prepared containing magnesium resource: magnesium oxide flue gas desulfurization waste residue and boron mud are mixed by weight the ratio of 9.2:1 It is even, 3.5h is calcined at 1300 DEG C, it is levigate to 150 mesh through ball mill grinding after being cooled to room temperature, it is made low-grade containing magnesium resource It is spare；
2) green potassium magnesium phosphate cement preparation: contain magnesium resource and potassium dihydrogen phosphate by weight for low-grade obtained in step 1) The ratio of 2.5:1 is uniformly mixed, and it is spare to be prepared into green potassium magnesium phosphate cement；
3) haydite ingredient: weighing engineering waste soil, green potassium magnesium phosphate cement and wood powder by above-mentioned formula rate, agitated uniform Solid mixture is made, it is spare；Water is weighed in the ratio of solid mixture gross mass 15%, it is spare；
4) feeding, balling-up: by the feeding system of computer program-control by the resulting solid mixture of step 3) to dribbling balling machine Continuous feeding, and be continuously sprayed at water weighed in step 3) in solid mixture in 3min, it is made in dribbling balling machine Grain balling-up；
5) it conserves, sieve: the good haydite of balling-up being placed in 18-22 DEG C, is conserved in the wet environment of relative humidity (RH) >=95% It after 7 days, is sieved, obtains the product of particle size range 5-20mm.Gained baking-free ceramicite sample is detected: haydite bulk density For 680kg/m3, cylindrical compress strength 3.8MPa, 1h water absorption rate is 22.6%, 28 days coefficient of softing 0.86, ammonia nitrogen place to go rate Up to 82.1%, phosphorus removal efficiency is up to 99.1%.
In this particular embodiment, engineering waste soil is native for nature dried bean noodles, and grinding 25min in the ball mill；Wood powder is Poplar wood powder, 120 mesh of granularity.Magnesium oxide flue gas desulfurization waste residue is wet oxidation magnesium processes flue gas desulfurization byproduct, content of magnesia Greater than 40%.Boron mud is the waste residue for producing boric acid or tincal product.
Above description is not limitation of the present invention, and the present invention is also not limited to the example above.The art it is common Within the essential scope of the present invention, the variations, modifications, additions or substitutions made also should belong to protection of the invention to technical staff Range.

Claims (7)

1. a kind of unburned functionally gradient composite haydite of engineering waste soil, it is characterised in that: the unburned functionally gradient of engineering waste soil The solid component of composite haydite is made of engineering waste soil, green potassium magnesium phosphate cement and wood powder, and engineering waste soil and green Potassium magnesium phosphate cement consumption is changed in gradient by kernel to shell, wherein the engineering waste soil dosage by engineering waste soil with The 5 ~ 10% of green potassium magnesium phosphate cement gross mass are successively reduced, and the green potassium magnesium phosphate cement consumption presses engineering waste soil It is successively increased with the 5 ~ 10% of green potassium magnesium phosphate cement gross mass；Meanwhile keeping engineering waste soil and green potassium magnesium phosphate cement Gross mass is constant, and the solid component of the unburned functionally gradient composite haydite kernel of the engineering waste soil is calculated by weight as: engineering 80-86 parts of waste soil, 11-16 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, and the solid component of its shell is according to parts by weight Are as follows: 15-20 parts of engineering waste soil, 76-82 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder.
2. the unburned functionally gradient composite haydite of a kind of engineering waste soil according to claim 1, it is characterised in that: described Engineering waste soil is nature dried bean noodles soil and grinding 20-30min in the ball mill.
3. the unburned functionally gradient composite haydite of a kind of engineering waste soil according to claim 1, it is characterised in that: described Green potassium magnesium phosphate cement by it is low-grade containing magnesium resource and potassium dihydrogen phosphate by weight (2.5-3.5): 1 ratio mix and At.
4. the unburned functionally gradient composite haydite of a kind of engineering waste soil according to claim 3, it is characterised in that: described It is low-grade containing magnesium resource by magnesium oxide flue gas desulfurization waste residue and boron mud by weight (9-9.5): 1 mixes, in 1200- 3-4h is calcined at 1350 DEG C, is cooled to room temperature, and through obtained by ball mill grinding, granularity is in 150-250 mesh.
5. the unburned functionally gradient composite haydite of a kind of engineering waste soil according to claim 4, it is characterised in that: described Magnesium oxide flue gas desulfurization waste residue is wet oxidation magnesium processes flue gas desulfurization byproduct, and content of magnesia is greater than 40%, and the boron mud is Produce the waste residue of boric acid or tincal product.
6. the unburned functionally gradient composite haydite of a kind of engineering waste soil according to claim 1, it is characterised in that: described Wood powder is poplar wood powder and granularity is 120 mesh.
7. a kind of preparation method of the unburned functionally gradient composite haydite of engineering waste soil of any of claims 1-6, Characterized by the following steps:
1) low-grade to be prepared containing magnesium resource: to be by weight (9-9.5) by magnesium oxide flue gas desulfurization waste residue and boron mud: 1 ratio It is uniformly mixed, calcines 3-4h at 1200-1350 DEG C, it is levigate to 150-250 mesh, system through ball mill grinding after being cooled to room temperature It obtains low-grade spare containing magnesium resource；
2) green potassium magnesium phosphate cement preparation: contain magnesium resource and potassium dihydrogen phosphate by weight for low-grade obtained in step 1) For (2.5-3.5): 1 ratio is uniformly mixed, and it is spare to be prepared into green potassium magnesium phosphate cement；
3) haydite ingredient: weighing engineering waste soil, green potassium magnesium phosphate cement and wood powder by formula rate, agitated to be uniformly made Solid mixture, it is spare；Water is weighed in the ratio of solid mixture gross mass 15-22%, it is spare；The wherein solid of composite haydite Component is changed in gradient by kernel to shell, and engineering waste soil dosage is by engineering waste soil and the total matter of green potassium magnesium phosphate cement The 5 ~ 10% of amount are successively reduced, and green potassium magnesium phosphate cement consumption is by engineering waste soil and the 5 of green potassium magnesium phosphate cement gross mass ~ 10% successively increases；Meanwhile keeping engineering waste soil and green potassium magnesium phosphate cement gross mass constant, composite haydite kernel is consolidated Body component is calculated by weight as: 80-86 parts of engineering waste soil, 11-16 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder, and outside it The solid component of shell is calculated by weight as: 15-20 parts of engineering waste soil, 76-82 parts of potassium magnesium phosphate cement and 3-5 parts of wood powder；
4) feeding, balling-up: by the feeding system of computer program-control by the prepared solid mixture of step 3) to disc type balling-up Machine continuous feeding, and be continuously sprayed at water weighed in step 3) in solid mixture in 2 ~ 5min, in dribbling balling machine Middle granulation balling-up；
5) it conserves, sieve: the good composite haydite of balling-up being placed in 18-22 DEG C, is conserved in the wet environment of relative humidity >=95% It after 7 days, is sieved, obtains the unburned functionally gradient composite haydite of engineering waste soil that particle size range is 5-20mm.
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Publication number Priority date Publication date Assignee Title
CN110981245A (en) * 2019-12-31 2020-04-10 深圳市华威环保建材有限公司 Engineering waste soil light recycled aggregate and preparation method and application thereof

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