CN110981401A - Method for preparing high-performance concrete by using gneiss waste rocks and waste photovoltaic panels - Google Patents

Abstract

The invention belongs to the technical field of building materials, and relates to a method for preparing high-performance concrete by using gneiss waste stones and waste photovoltaic plates. The preparation method improves the comprehensive utilization rate of the solid waste, realizes the green sustainable utilization of the solid waste, and simultaneously reduces the preparation cost of the high-performance concrete.

Description

Method for preparing high-performance concrete by using gneiss waste rocks and waste photovoltaic panels

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a method for preparing high-performance concrete by using gneiss waste rocks and waste photovoltaic plates.

Background

Along with the continuous expansion of the scale of the infrastructure of China, the urbanization level is continuously improved, and the requirements on the performance of concrete are higher and higher due to the deep implementation of relevant policies of governments. In recent years, with the shortage of natural sandstone resources, high-quality sand is less and less, and a lot of areas lack of sandstone resources have insufficient supply of raw materials for preparing high-strength concrete. Therefore, more and more attention is paid to the development of the technology for producing high-performance concrete by replacing natural gravels with tailings and waste rocks.

Gneiss belongs to metamorphic rocks, mainly comprises feldspar and quartz, and is metamorphic rock with medium-grain metamorphic structure and gneiss-shaped or strip-shaped structure. With the rapid development of highway engineering, the number of tunnel construction is increasing day by day, and the number of generated tunnel waste slag is also increasing at a very rapid speed, and the number of the tunnel waste slag is more than that of gneiss. According to the estimation, about 50-60 ten thousand square waste residues need to be treated, if the waste residues are not treated in time, necessary protective measures are taken, water and soil loss is increased, the construction, safe operation and normal performance of benefits of the engineering are affected, the siltation of the riverway along the line is increased, the flood control and flood fighting capacity is reduced, a large amount of waste residues are accumulated into mountains in the long term, the land is occupied, the environment is polluted, and the safety of industrial and agricultural production and the safety of lives and properties of people are endangered. Therefore, how to reasonably utilize the gneiss waste rocks to create social value is very important.

Among the numerous solar cells, crystalline silicon solar cells have always dominated the photovoltaic market. The crystalline silicon solar cell photovoltaic system mainly comprises materials such as silicon, aluminum, silver, copper, glass and plastics. The main part of polycrystalline silicon of the cell has high recovery value, and with the great increase of solid waste of the solar cell, the research and development of a low-cost recovery technology of the solar cell is imperative. Due to aging of the whole photovoltaic system components and the like, it is expected that by 2020, a large number of solar cells will be exposed to decommissioning. At this time, the accumulated amount of discarded solar cells imposes a heavy burden on the environment, and the demand for raw materials for solar cells is also increased. If the waste solar cell can be recycled, the environmental problem can be solved, the industrial cost can be reduced, and the social development and environmental protection are certainly and greatly facilitated.

The bean product wastewater is wastewater in bean product production, and has high Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), Total Nitrogen (TN) and ammonia Nitrogen (NH)₃N) is also higher, belonging to the wastewater with high concentration and high biodegradability. If the waste water is directly discharged, the field, the water quality and other environmental pollution can be caused. With the continuous expansion of the bean product processing industry, people pay more and more attention to the problem of environmental pollution.

In view of the above, the present invention is particularly proposed.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a method for preparing high-performance concrete by using gneiss waste stones and waste photovoltaic plates, the method can recycle the wastes such as the gneiss waste stones and the waste photovoltaic plates with high yield, a new method is provided for recycling gneiss tailings and the waste photovoltaic plates, the utilization rate of resources is improved, the harm of the wastes to the environment is reduced, and the high-performance concrete is obtained and has social value. The preparation method improves the comprehensive utilization rate of the solid waste, realizes the green sustainable utilization of the solid waste, and simultaneously reduces the preparation cost of the high-performance concrete.

In order to achieve the technical effect, the technical scheme is as follows:

a method for preparing high-performance concrete by using gneiss waste rocks and waste photovoltaic panels comprises the following steps:

step 1, crushing, shaping and screening the gneiss waste stones to obtain gneiss waste stone particles with the particle sizes of more than 20mm, 5-20 mm and 0.15-5 mm, wherein the gneiss waste stones with the particle sizes of more than 20mm are used for secondary crushing, the gneiss waste stone particles with the particle sizes of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with the particle sizes of 0.15-5 mm are used as waste stone fine aggregates;

step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 900-1300 ℃;

step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 600-900 m²Per kg, obtaining a pre-grinding material;

step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²Per kg, obtaining the composite gelled material;

step 5, uniformly mixing the waste stone coarse aggregate, the waste stone fine aggregate and the composite cementing material to obtain a dry material mixture;

and 6, adding a water reducing agent and water into the dry material mixture, uniformly stirring, and then performing pouring, forming, demolding and standard curing to obtain the high-performance concrete.

The invention utilizes the gneiss waste stone, the waste photovoltaic panel, the silica fume, the fly ash, the desulfurized gypsum, the red mud and a small amount of cement clinker to prepare the high-performance concrete, which can be used for preparing high-strength concrete products with the compressive strength of more than 80MPa, so as to realize the utilization of the solid wastes such as the gneiss waste stone, the waste photovoltaic panel, the desulfurized gypsum, the red mud and the like in a large proportion, reduce the energy consumption and reduce the CO₂The purpose of discharging realizes the sustainable utilization of the solid waste.

As an embodiment, the gneiss comprises SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

As an embodiment, the photovoltaic panel comprises SiO in mass fraction₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

As an embodiment, the silica fume comprises SiO in mass fraction₂85～95％，CaO 1～4％，K₂O0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

In one embodiment, the cement clinker comprises, by mass, 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of residue.

As an embodiment, the desulfurized gypsum comprises SO in mass fraction₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue.

As an embodiment, the red mud is sintering process red mud, and the chemical components of the red mud comprise SiO in mass fraction₂20～25％，CaO 40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

As an embodiment, the mass ratio of the photovoltaic panel particles and the silica fume in the pre-abrasive is 5: 1.

as an embodiment, the composite cementing material comprises, by mass, 50-70% of a pre-grinding material, 5-10% of cement clinker, 5-15% of red mud and 10-20% of desulfurized gypsum.

As an embodiment, the dry material mixture comprises the following components in parts by mass: 35-55% of coarse aggregate, 20-35% of fine aggregate and 25-30% of composite cementing material.

In one embodiment, the water reducing agent is added in an amount of 1-4% by mass of the composite cementing material, and the water is added in an amount of 21-25% by mass of the composite cementing material.

As an embodiment, the water reducing agent is bean product wastewater, and the bean product wastewater is treated by the following steps: the bean product wastewater is refrigerated at the temperature of 1-6 ℃, steel slag with the particle size of less than 0.15mm is added into the bean product wastewater for flocculation treatment, the flocculation time is not less than 3h, and the filtrate is obtained by filtration, namely the water reducer.

Another object of the present invention is to provide a high performance concrete obtained by the method for preparing high performance concrete from gneiss waste stones and photovoltaic waste plates according to any one of the above.

Still another object of the present invention is to provide a method for preparing a composite cementitious material from waste photovoltaic panels, red mud and desulfurized gypsum, comprising the steps of:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at the high temperature of 900-1300 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to 600-900 m of specific surface area²Per kg, obtaining a pre-grinding material;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²And/kg, obtaining the composite cementing material.

Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:

1. in the method for preparing the high-performance concrete, the solid wastes such as the red mud, the desulfurized gypsum and the like are adopted for 100 percent of the coarse and fine aggregates, the proportion of the cement clinker is reduced, the proportion of the solid wastes such as the red mud and the desulfurized gypsum is greatly improved, the resource utilization of the solid wastes is realized, the national green development concept is implemented, the preparation cost of the high-strength concrete is reduced, the high-added-value utilization of the solid wastes is realized, a new idea is provided for the reasonable utilization of the gneiss tailings, the waste photovoltaic panels and the recycled aggregate concrete, the comprehensive utilization rate of the solid wastes can reach more than 90 percent, the damage of the accumulation of the gneiss waste stones and the waste photovoltaic panels to the ecological environment is reduced, and good economic benefit and social benefit are brought.

2. According to the method for preparing the high-strength concrete by using the gneiss and the waste photovoltaic panels, the gneiss waste rocks and the waste photovoltaic panels are selected as main raw materials, and the photovoltaic panels belong to polycrystalline silicon waste and provide sufficient siliceous materials for strength development of the concrete.

3. Compared with common silicate cement, the proportion of cement clinker in the cementing material of the system is reduced by more than 60 percent, and the proportion of red mud and desulfurized gypsum is greatly improved, so that on one hand, the cementing material system can greatly save the cement clinker, thereby reducing the emission of CO₂And can utilize a large amount of solid waste.

4. In a high-strength concrete material system prepared from raw materials taking gneiss and waste photovoltaic panels as cores, due to the fact that the content of metal oxides (CaO + MgO + FeO) in the gneiss is high, after a large number of waste photovoltaic panels are doped, the pH value of a gelling system can be obviously increased, the alkalinity of the system is increased, and further hydrolysis of the gneiss is facilitated. The divalent metal oxide in the waste photovoltaic panel is not only a material basis for exciting slag to form C-S-H gel, but also can be used for extracting Al in the slag in the presence of gypsum₂O₃And Fe₂O₃Forming a material base containing the iron-calcium-vanadium stone complex salt. The waste photovoltaic panel has more silicon (aluminum) oxygen tetrahedrons with potential hydraulic activity, which are 2-3 times of cement clinker, and in Slag (SiO)₂+Al₂O₃) The molar ratio of CaO + MgO is 0.9 or more. The large amount of dissociation of the photovoltaic panel can absorb Ca in the system²⁺Promoting gneissDissociation of (3). Under the synergistic excitation action of gneiss and the release gypsum, more silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons in the photovoltaic panel are dissociated to generate more C-S-H gel and AFt, so that more heavy metal ions are solidified. On the other hand, Ca provided by gneiss and desulfurized gypsum²⁺、OH^-And SO₄ ^2-Promotes the formation of the lead-calcium-containing vanadium-containing double-salt minerals, so that part of heavy metal ions enter the interior of crystal lattices in a manner of analogous substitution, thereby being more solidified.

5. Silica fume is added into the cementing material system, so that the compactness and durability of concrete are improved. The agglomeration phenomenon in the undisturbed silica fume is serious, and the calcined photovoltaic panel particles and the silica fume are ground together, so that the high dispersion of the silica fume is ensured, and the alkali aggregate effect can be avoided. The red mud can play a good alkali excitation role in a gelling system. The bean product wastewater can replace the water reducing agent, so that the use cost of the water reducing agent is reduced.

6. Compared with the concrete produced by tailings and with the compressive strength of below C60, the invention can produce high-performance concrete products with the compressive strength of above 80MPa at low cost, can improve the added value of products, can generate better economic benefit, and provides a new way for the comprehensive utilization of the gneiss waste stones and the waste photovoltaic panels.

Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a process flow diagram of the method of the present invention for preparing high strength concrete from gneiss waste rocks and waste photovoltaic panels.

FIG. 2 is a process flow diagram of the method for preparing the composite cementing material by using the waste photovoltaic panel, the red mud and the desulfurized gypsum.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.

As shown in fig. 1, the present invention relates to a method for preparing high performance concrete from gneiss waste rocks and waste photovoltaic panels, comprising the steps of:

step 1, crushing, shaping and screening the gneiss waste stones to obtain gneiss waste stone particles with the particle sizes of more than 20mm, 5-20 mm and 0.15-5 mm, wherein the gneiss waste stones with the particle sizes of more than 20mm are used for secondary crushing, the waste stone particles with the particle sizes of 5-20 mm are used as waste stone coarse aggregates, and the waste stone particles with the particle sizes of 0.15-5 mm are used as waste stone fine aggregates;

step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 900-1300 ℃;

step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 600-900 m²Per kg, obtaining a pre-grinding material;

step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²Per kg, obtaining the composite gelled material;

step 5, uniformly mixing the waste stone coarse aggregate, the waste stone fine aggregate and the composite cementing material to obtain a dry material mixture;

and 6, adding a water reducing agent and water into the dry material mixture, uniformly stirring, and then performing pouring, forming, demolding and standard curing to obtain the high-performance concrete.

Preferably, the gneiss comprises SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01～1％，0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Preferably, the photovoltaic panel comprises SiO in mass fraction₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Preferably, the silica fume comprises SiO in mass fraction₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Preferably, the cement clinker comprises 55-75% of CaO and SiO in percentage by mass ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of residue.

Preferably, the desulfurized gypsum comprises SO in mass fraction₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue.

Preferably, the red mud is sintering process red mud, and the chemical components of the red mud comprise SiO in mass fraction₂20～25％，CaO 40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

Preferably, the mass ratio of the photovoltaic panel particles to the silica fume in the pre-grinding material is 5: 1.

preferably, the composite cementing material comprises, by mass, 50-70% of a pre-grinding material, 5-10% of cement clinker, 5-15% of red mud and 10-20% of desulfurized gypsum.

Preferably, the dry material mixture comprises the following components in parts by mass: 35-55% of coarse aggregate, 20-35% of fine aggregate and 25-30% of composite cementing material.

Preferably, the adding amount of the water reducing agent is 1-4% of the mass of the composite cementing material, and the adding amount of the water is 21-25% of the mass of the composite cementing material.

Preferably, the water reducing agent is bean product wastewater, and the bean product wastewater is treated by the following steps: the bean product wastewater is refrigerated at the temperature of 1-6 ℃, steel slag with the particle size of less than 0.15mm is added into the bean product wastewater for flocculation treatment, the flocculation time is not less than 3h, and the filtrate is obtained by filtration, namely the water reducer.

The invention also relates to high-performance concrete obtained by the method for preparing the high-performance concrete by using the gneiss waste rocks and the waste photovoltaic panels.

The invention also relates to a method for preparing the composite cementing material by using the waste photovoltaic panel, the red mud and the desulfurized gypsum, which comprises the following steps as shown in figure 2:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at the high temperature of 900-1300 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to 600-900 m of specific surface area²Per kg, obtaining a pre-grinding material;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²And/kg, obtaining the composite cementing material.

Example 1

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle diameters of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle diameters of more than 20mm again, wherein the gneiss waste stone particles with particle diameters of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with particle diameters of 0.15-5 mm are used as waste stone fine aggregates;

wherein the chemical components of the gneiss waste rock are SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 900 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to 600m of specific surface area²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises the following components in percentage by mass: 60% of pre-grinding material, 5% of cement clinker, 15% of red mud and 20% of desulfurized gypsum;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of remainder;

the desulfurization gypsum comprises the following chemical components in percentage by mass: SO (SO)₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

the red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 40% of the waste stone coarse aggregate, 35% of the waste stone fine aggregate and 25% of the composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 2% of the mass of the composite cementing material and water accounting for 22% of the mass of the dry material mixture, and uniformly stirring;

wherein the water reducing agent is bean product wastewater which is treated by the following steps: refrigerating the bean product wastewater at the temperature of 1-6 ℃, adding steel slag with the particle size of less than 0.15mm into the bean product wastewater for flocculation treatment for not less than 3h, and filtering to obtain filtrate, namely the water reducer;

after stirring for 150s uniformly, pouring and placing the mixture into a standard mould, placing the mixture into a vibrating table for compaction, then placing the mixture into a standard condition for curing for 24h, then demoulding, continuing to place the mixture into the standard condition for curing to different ages, and testing the flexural strength and the compressive strength of 3d, 7d and 28d respectively according to GB/T50081-2002 Standard test method for mechanical properties of common concrete, wherein the results are shown in Table 1.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 900 ℃;

step (ii) ofS2, mixing and grinding the calcined photovoltaic panel particles and silica fume to 600m of specific surface area²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises the following components in percentage by mass: 60% of pre-grinding material, 5% of cement clinker, 15% of red mud and 20% of desulfurized gypsum.

TABLE 1

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples are respectively taken at the curing ages of 3d, 7d and 28d, and a leaching test is carried out on a lead-containing clean slurry sample by referring to HJ 557-2009 toxicity method for leaching solid waste-horizontal oscillation method, and Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 2.

TABLE 2

Example 2

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle diameters of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle diameters of more than 20mm again, wherein the gneiss waste stone particles with particle diameters of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with particle diameters of 0.15-5 mm are used as waste stone fine aggregates;

wherein the gneiss waste rockThe chemical composition of (A) is SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1000 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 650m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 540m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises the following components in percentage by mass: 64% of pre-grinding material, 6% of cement clinker, 12% of red mud and 18% of desulfurized gypsum;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of remainder;

wherein, take offThe sulfur gypsum comprises the following chemical components in percentage by mass: SO (SO)₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

the red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 45% of the waste stone coarse aggregate, 25% of the waste stone fine aggregate and 30% of the composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 3% of the mass of the composite cementing material and 23% of water into the dry material mixture, and uniformly stirring;

wherein the water reducing agent is bean product wastewater which is treated by the following steps: refrigerating the bean product wastewater at the temperature of 1-6 ℃, adding steel slag with the particle size of less than 0.15mm into the bean product wastewater for flocculation treatment for not less than 3h, and filtering to obtain filtrate, namely the water reducer;

stirring for 180s, pouring into a standard mold, placing into a vibrating table, compacting, curing for 24h under standard conditions, demolding, continuously placing under standard conditions, curing to different ages, and respectively testing the flexural strength and compressive strength of 3d, 7d and 28d according to GB/T50081 plus 2002 Standard test method for mechanical Properties of ordinary concrete, wherein the results are shown in Table 3.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1000 ℃;

step S2, calcining the photovoltaic panel particlesMixing with silica fume and grinding to specific surface area of 650m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 540m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises the following components in percentage by mass: 64% of pre-grinding material, 6% of cement clinker, 12% of red mud and 18% of desulfurized gypsum.

TABLE 3

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples are respectively taken at the curing ages of 3d, 7d and 28d, and a leaching test is carried out on a lead-containing clean slurry sample by referring to HJ 557-2009 toxicity method for leaching solid waste-horizontal oscillation method, and Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 4.

TABLE 4

Example 3

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle diameters of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle diameters of more than 20mm again, wherein the gneiss waste stone particles with particle diameters of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with particle diameters of 0.15-5 mm are used as waste stone fine aggregates;

wherein the chemical components of the gneiss waste rock are SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1100 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 700m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to specific surface area of 580m²Per kg, obtaining the composite gelled material; the composite cementing material comprises 70% of pre-grinding material, 7% of cement clinker, 6% of red mud and 17% of desulfurized gypsum by mass;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of remainder;

the desulfurization gypsum comprises the following chemical components in percentage by mass:SO₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue.

The red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 50% of waste rock coarse aggregate, 20% of gneiss waste rock fine aggregate and 30% of the composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 2% of the mass of the composite cementing material and 24% of water into the dry material mixture, and uniformly stirring;

the water reducing agent is bean product wastewater which is treated by the following steps: refrigerating the bean product wastewater at the temperature of 1-6 ℃, adding steel slag with the particle size of less than 0.15mm into the bean product wastewater for flocculation treatment for not less than 3h, and filtering to obtain filtrate, namely the water reducer;

after stirring for 210s, pouring the mixture into a standard mould, placing the mixture into a vibrating table for compaction, then placing the mixture into a standard condition for maintenance for 24h, then demoulding, continuing to place the mixture into the standard condition for maintenance to different ages, and respectively testing the flexural strength and the compressive strength of 3d, 7d and 28d according to GB/T50081 plus 2002 Standard of the test method for mechanical properties of common concrete, wherein the results are shown in Table 5.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at the high temperature of 1100 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 700m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to specific surface area of 580m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises 70% of pre-grinding material, 7% of cement clinker, 6% of red mud and 17% of desulfurized gypsum by mass fraction.

TABLE 5

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples are respectively taken at the curing ages of 3d, 7d and 28d, and a leaching test is carried out on a lead-containing clean slurry sample by referring to HJ 557-2009 toxicity method for leaching solid waste-horizontal oscillation method, and Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 6.

TABLE 6

Example 4

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle sizes of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle sizes of more than 20mm again, wherein the gneiss waste stone particles with particle sizes of 5-20 mm are used as waste stone coarse aggregates, and the waste stone particles with particle sizes of 0.15-5 mm are used as waste stone fine aggregates;

wherein the chemical components of the gneiss waste rock are SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1100 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, loss on ignition 0.01-5%, and others 0.01-3%.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to reach the specific surface area of 750m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 620m²Per kg, obtaining the composite gelled material; the composite cementing material comprises 67% of pre-grinding material, 8% of cement clinker, 10% of red mud and 15% of desulfurized gypsum by mass;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of remainder;

the desulfurization gypsum comprises the following chemical components in percentage by mass: SO (SO)₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

the red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 55% of the waste stone coarse aggregate, 20% of the waste stone fine aggregate and 25% of the composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 3% of the mass of the composite cementing material and water accounting for 22% of the mass of the dry material mixture, and uniformly stirring;

wherein the water reducing agent is bean product wastewater which is treated by the following steps: refrigerating the bean product wastewater at the temperature of 1-6 ℃, adding steel slag with the particle size of less than 0.15mm into the bean product wastewater for flocculation treatment for not less than 3h, and filtering to obtain filtrate, namely the water reducer;

after stirring for 240s, pouring the mixture into a standard mould, placing the mixture into a vibrating table for compaction, then placing the mixture into a standard condition for maintenance for 24h, then demoulding, continuing to place the mixture into the standard condition for maintenance to different ages, and respectively testing the flexural strength and the compressive strength of 3d, 7d and 28d according to GB/T50081 plus 2002 Standard of the test method for mechanical properties of common concrete, wherein the results are shown in Table 7.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at the high temperature of 1100 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to specific surface area of 750m²Kg, obtaining a pre-abrasive, wherein the pre-abrasive is photovoltaicThe mass ratio of the plate particles to the silica fume particles is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 620m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises 67% of pre-grinding material, 8% of cement clinker, 10% of red mud and 15% of desulfurized gypsum by mass fraction.

TABLE 7

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples are respectively taken at the curing ages of 3d, 7d and 28d, and a leaching test is carried out on a lead-containing clean slurry sample by referring to HJ 557-2009 toxicity method for leaching solid waste-horizontal oscillation method, and Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 8.

TABLE 8

Example 5

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle diameters of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle diameters of more than 20mm again, wherein the gneiss waste stone particles with particle diameters of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with particle diameters of 0.15-5 mm are used as waste stone fine aggregates;

wherein the chemical components of the gneiss waste rock are SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1200 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to reach specific surface area of 800m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to specific surface area of 660m²The method comprises the following steps of (1) obtaining a composite cementing material, wherein the composite cementing material comprises 61% of pre-grinding material, 9% of cement clinker, 12% of red mud and 18% of desulfurized gypsum by mass;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of residue.

The desulfurization gypsum comprises the following chemical components in percentage by mass: SO (SO)₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

the red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 51% of waste stone coarse aggregate, 22% of waste stone fine aggregate and 27% of composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 2% of the mass of the composite cementing material and 25% of water into the dry material mixture, and uniformly stirring;

wherein the water reducing agent is bean product wastewater which is treated by the following steps: refrigerating the bean product wastewater at the temperature of 1-6 ℃, adding steel slag with the particle size of less than 0.15mm into the bean product wastewater for flocculation treatment for not less than 3h, and filtering to obtain filtrate, namely the water reducer;

after stirring for 250s, pouring and placing the mixture into a standard mould, placing the mixture into a vibrating table for compaction, placing the mixture into a standard condition for maintenance for 24h, then demoulding, continuing to place the mixture into the standard condition for maintenance to different ages, and respectively testing the flexural strength and the compressive strength of 3d, 7d and 28d according to GB/T50081-2002 Standard test method for mechanical properties of common concrete, wherein the results are shown in Table 9.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1200 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to reach the specific surface area of 800m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to specific surface area of 660m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises 61% of pre-grinding material, 9% of cement clinker, 12% of red mud and 18% of desulfurized gypsum by mass fraction.

TABLE 9

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples are respectively taken at the curing ages of 3d, 7d and 28d, and a leaching test is carried out on a lead-containing clean slurry sample by referring to HJ 557-2009 toxicity method for leaching solid waste-horizontal oscillation method, and Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 10.

Watch 10

Example 6

Step 1, performing jaw crushing, shaping and screening on the gneiss waste stones to obtain gneiss waste stone particles with particle diameters of more than 20mm, 5-20 mm and 0.15-5 mm, and performing jaw crushing on the gneiss waste stone particles with particle diameters of more than 20mm again, wherein the gneiss waste stone particles with particle diameters of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with particle diameters of 0.15-5 mm are used as waste stone fine aggregates;

wherein the chemical components of the gneiss waste rock are SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO 0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

Step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 1250 ℃;

the waste photovoltaic panel comprises the following chemical components in percentage by mass: SiO 2₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

Step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to specific surface area of 850m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

the silica fume comprises the following chemical components in percentage by mass: SiO 2₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0 to 0.02%, 0.01 to 2% of loss-on-ignition material, and 0.01 to 1% of residue.

Step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to the specific surface area of 700m²The method comprises the following steps of (1) obtaining a composite cementing material, wherein the composite cementing material comprises 70% of pre-grinding material, 10% of cement clinker, 5% of red mud and 15% of desulfurized gypsum by mass;

the cement clinker comprises the following chemical components in percentage by mass: 55-75% of CaO and SiO ₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of residue.

The desulfurization gypsum comprises the following chemical components in percentage by mass: SO (SO)₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

the red mud is sintered red mud, and comprises the following chemical components in percentage by mass: SiO 2₂20～25％，CaO40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

And 5, uniformly mixing 52% of waste stone coarse aggregate, 26% of waste stone fine aggregate and 22% of the composite cementing material to obtain a dry material mixture.

Step 6, adding a water reducing agent accounting for 2% of the mass of the composite cementing material and water accounting for 22% of the mass of the dry material mixture, and uniformly stirring;

wherein the water reducing agent is bean product wastewater which is treated by the following steps: the bean product wastewater is refrigerated at the temperature of 1-6 ℃, steel slag with the particle size of less than 0.15mm is added into the bean product wastewater for flocculation treatment, the flocculation time is not less than 3h, and the filtrate, namely the water reducing agent, is obtained after filtration. After stirring for 200s, pouring and pouring into a standard mold, placing in a vibrating table for compaction, placing in a standard condition for maintenance for 24h, then demolding, continuing to place in the standard condition for maintenance to different ages, and respectively testing the flexural strength and the compressive strength of 3d, 7d and 28d according to GB/T50081 plus 2002 Standard test method for mechanical Properties of ordinary concrete, and the results are shown in Table 11.

TABLE 11

Adding Pb (NO)₃)₂Preparing Pb²⁺Pb (NO) at 0.5% by mass₃)₂And (3) uniformly mixing the solution and the composite cementing material according to the water-gel ratio of 0.20 to prepare a lead-containing neat paste sample. Meanwhile, a lead-fixing sample was prepared by using P.I 32.5 cement as a control. Samples were taken at maintenance ages of 3d, 7d and 28d, respectively, see HJ 557-2009 "toxicity method by leaching of solid waste-levelShaking method, leaching test of lead-containing paste sample to obtain Pb in the leaching solution²⁺The concentration of the lead is determined by an inductively coupled plasma spectrometer according to the regulation of GB 5085.3-2007' identification Standard for Leaching toxicity²⁺Concentrations, as shown in table 12.

A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum comprises the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at 1250 ℃ at high temperature;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to specific surface area of 850m²And/kg, obtaining a pre-grinding material, wherein the mass ratio of photovoltaic panel particles to silica fume particles in the pre-grinding material is 5: 1;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 700m²And/kg, obtaining the composite cementing material, wherein the composite cementing material comprises 70% of pre-grinding material, 10% of cement clinker, 5% of red mud and 15% of desulfurized gypsum by mass fraction.

TABLE 12

The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.

Claims (10)

1. A method for preparing high-performance concrete by using gneiss waste rocks and waste photovoltaic panels is characterized by comprising the following steps:

step 1, crushing, shaping and screening the gneiss waste stones to obtain gneiss waste stone particles with the particle sizes of more than 20mm, 5-20 mm and 0.15-5 mm, wherein the gneiss waste stones with the particle sizes of more than 20mm are used for secondary crushing, the gneiss waste stone particles with the particle sizes of 5-20 mm are used as waste stone coarse aggregates, and the gneiss waste stone particles with the particle sizes of 0.15-5 mm are used as waste stone fine aggregates;

step 2, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at high temperature, wherein the calcining temperature is 900-1300 ℃;

step 3, mixing and grinding the calcined photovoltaic panel particles and silica fume to the specific surface area of 600-900 m²Per kg, obtaining a pre-grinding material;

step 4, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²Per kg, obtaining the composite gelled material;

step 5, uniformly mixing the waste stone coarse aggregate, the waste stone fine aggregate and the composite cementing material to obtain a dry material mixture;

and 6, adding a water reducing agent and water into the dry material mixture, uniformly stirring, and then performing pouring, forming, demolding and standard curing to obtain the high-performance concrete.

2. The method of making high performance concrete from gneiss waste rock and photovoltaic waste slab as claimed in claim 1, wherein the gneiss comprises SiO in mass fraction₂40～65％，Al₂O₃20～40％，CaO 5～10％，MgO0.5～2％，Fe₂O₃+FeO 0.01～5％，K₂O 0.01～2％，Na₂O 0.01～2％，P₂O₅0.01-1%, 0.01-5% of loss-on-ignition material and 0.01-2% of residue.

3. The method of producing high performance concrete from gneiss waste stones and photovoltaic waste panels as claimed in claim 1, wherein the photovoltaic panels comprise SiO in mass fraction₂65～80％，NaCl 15～35％，CaCl₂0.01-3%, 0.01-5% of loss-on-ignition material and 0.01-3% of residue.

4. The method of claim 1, wherein the method comprises using the gneiss waste rock and the photovoltaic waste slab to prepare high performance concreteThe silica fume comprises SiO in mass fraction₂85～95％，CaO 1～4％，K₂O 0.01～1％，Na₂O 0.01～1％，Al₂O₃0.1～2％，Fe₂O₃0.1～1％，CaCl₂0-0.02%, 0.01-2% of loss-on-ignition material and 0.01-1% of residue;

preferably, the cement clinker comprises 55-75% of CaO and SiO in percentage by mass₂10～30％，Al₂O₃1～10％，Fe₂O₃0.1～5％，K₂O 0.01～1％，MgO 0.01～1％，Na₂O 0.01～1％，MnO 0.01～1％，TiO₂0.01-1%, 0.01-0.5% of loss-on-ignition material and 0.01-2% of remainder;

preferably, the desulfurized gypsum comprises SO in mass fraction₃30～50％，CaO 20～40％，SiO₂2～5％，P₂O₅1～3％，MgO 0.01～2％，Na₂O 0.01～1％，Fe₂O₃0.01～5％，K₂O 0.01～1％，Na₂0.01-1% of O, 15-25% of loss-on-ignition material and 0.01-1% of residue;

preferably, the red mud is sintering process red mud, and the chemical components of the red mud comprise SiO in mass fraction₂20～25％，CaO 40～60％，Al₂O₃1～10％，Fe₂O₃5～15％，K₂O 0.01～1％，Na₂O 1～3％，TiO₂0.1-5% and 5-20% of loss-on-ignition material.

5. The method for preparing high-performance concrete from gneiss waste stones and waste photovoltaic panels according to claim 1, wherein the mass ratio of the photovoltaic panel particles to the silica fume in the pre-grinding material is 5: 1.

6. the method for preparing the high-performance concrete by using the gneiss waste stones and the waste photovoltaic panels according to claim 1, wherein the composite cementing material comprises 50-70% of pre-grinding materials, 5-10% of cement clinker, 5-15% of red mud and 10-20% of desulfurized gypsum in percentage by mass;

preferably, the dry material mixture comprises the following components in parts by mass: 35-55% of coarse aggregate, 20-35% of fine aggregate and 25-30% of composite cementing material.

7. The method for preparing high-performance concrete by using gneiss waste stones and waste photovoltaic panels according to claim 1, wherein the addition amount of the water reducing agent is 1-4% of the mass of the composite cementing material, and the addition amount of water is 21-25% of the mass of the composite cementing material.

8. The method for preparing high-performance concrete from gneiss waste stones and waste photovoltaic panels according to claim 7, wherein the water reducing agent is bean product wastewater, and the bean product wastewater is treated by the following steps: the bean product wastewater is refrigerated at the temperature of 1-6 ℃, steel slag with the particle size of less than 0.15mm is added into the bean product wastewater for flocculation treatment, the flocculation time is not less than 3h, and the filtrate is obtained by filtration, namely the water reducer.

9. High performance concrete obtained by a method for preparing high performance concrete from gneiss waste stones and photovoltaic waste slabs according to any one of claims 1 to 8.

10. A method for preparing a composite cementing material by using waste photovoltaic panels, red mud and desulfurized gypsum is characterized by comprising the following steps:

s1, crushing the waste photovoltaic panel to obtain photovoltaic panel particles with the particle size of 10-20 mm, and calcining at the high temperature of 900-1300 ℃;

step S2, mixing and grinding the calcined photovoltaic panel particles and silica fume to 600-900 m of specific surface area²Per kg, obtaining a pre-grinding material;

step S3, mixing the pre-grinding material with cement clinker, red mud and desulfurized gypsum, and grinding the mixture to a specific surface area of 500-700m²And/kg, obtaining the composite cementing material.

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