CN113402244A

CN113402244A - Setting and curing material, hardened body containing same and preparation method thereof

Info

Publication number: CN113402244A
Application number: CN202110750650.8A
Authority: CN
Inventors: 张昱朔; 于树江; 杨国辉; 李志国
Original assignee: Shuimu Beijing Energy And Environmental Protection Co ltd
Current assignee: Shuimu Beijing Energy And Environmental Protection Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2021-09-17

Abstract

The invention provides a setting and curing material, a hardened body containing the setting and curing material and a preparation method thereof. The setting and curing material includes: inorganic curing agents, mining solid wastes, and composite admixtures; wherein the mass ratio of the inorganic curing agent to the mining solid waste to the composite admixture is 1 (0.3-3) to 0.005-0.1. The condensation curing material can efficiently adsorb harmful components in the high-salinity organic waste liquid evaporation salty mud, and improve the compactness; but also can increase the viscosity of the slurry of the setting and curing material, reduce the bleeding phenomenon of a cured body and improve the strength of the cured body. Furthermore, the invention adopts the mining solid waste as the aggregate, thereby not only saving limestone resources, but also being capable of treating the mining solid waste and further reducing the manufacturing cost.

Description

Setting and curing material, hardened body containing same and preparation method thereof

Technical Field

The invention relates to a condensation curing material, a hardening body containing the condensation curing material and a preparation method thereof, in particular to a condensation curing material for condensation curing of industrial high-salt organic waste liquid evaporated salt mud, belonging to the technical field of hazardous waste treatment of environmental protection.

Background

With the rapid development of industry, the variety and the amount of waste water are rapidly increased, the pollution to water bodies is more and more extensive and serious, and the health and the safety of human beings are threatened, wherein industrial high-salt organic waste liquid is prominent. The conventional treatment process of industrial high-salt organic waste liquid mainly includes nanofiltration membrane method, thermal salt separation method, multiple-effect evaporation, forced circulation evaporation, cooling crystallization and the like. After the main flow processes such as evaporation crystallization and the like are carried out, a large amount of mixed salt still exists in the final product and cannot be treated;

present salt waste annual output is very high, if handle improper, can directly lead to surface water, groundwater pollution, pollute soil, destroy ecological environment, the miscellaneous salt that produces among the industrial waste water treatment process simultaneously is useless owing to belong to the danger, the useless treatment cost of danger is very high, one ton dangerous is useless to be dealt with the cost at 3000 ~ 6000 yuan/ton, can bring huge environmental protection and economic pressure for the enterprise production, consequently, solve the innocent treatment of miscellaneous salt, become general solid waste behind the miscellaneous salt processing, be urgent technical problem waiting to solve.

Patent document CN110550959A discloses a treatment method of salt residue from salt-containing organic wastewater crystallization and the use thereof. The processing method comprises the following steps: (1) mixing and heating salt-containing organic wastewater crystallization residual salt and sulfuric acid to convert inorganic salt in the crystallization residual salt into sulfate, so as to obtain mixed salt containing sulfate; (2) and (2) mixing the sulfate-containing mixed salt obtained in the step (1) with a curing agent, and carrying out pyrolysis curing to obtain a mineral composite compound. The method needs a large amount of sulfuric acid, generates a large amount of tail gas, and pollutes the environment when the treatment is improper.

Therefore, the research on harmless treatment of the miscellaneous salt without polluting the environment becomes a technical problem to be solved urgently after the miscellaneous salt is treated to become common solid waste.

Disclosure of Invention

The problem to be solved by the inventionQuestion (I)

In view of the technical problems in the prior art, the invention firstly provides a condensation curing material which can effectively solve the problem of poor treatment effect of miscellaneous salt after evaporation of industrial high-salt organic waste liquid, thereby realizing harmless treatment of miscellaneous salt.

Further, the present invention provides a hardened body comprising the set and cured material, which is excellent in compressive strength, impact resistance, soaking resistance and the like.

Furthermore, the invention also provides a preparation method of the hardened body, which is simple and feasible and is suitable for mass production.

Means for solving the problems

The present invention provides a setting and curing material comprising:

an inorganic curing agent, wherein the inorganic curing agent,

mining solid waste, and

a composite admixture; wherein the content of the first and second substances,

the mass ratio of the inorganic curing agent to the mining solid waste to the composite additive is 1 (0.3-3) to 0.005-0.1.

The setting and curing material according to the present invention, wherein the inorganic curing agent includes one or a combination of two or more of silicate, aluminoferrite, and aluminate.

The coagulation and solidification material comprises one or more of stone powder, fly ash, broken stone chips, coal gangue, fly ash, steel slag, desulfurized gypsum and desulfurized alkali slag.

The condensation curing material comprises 40-60% of coal gangue with the particle size of less than 5mm, 30-40% of coal gangue with the particle size of 5-15 mm and 10-20% of coal gangue with the particle size of 15-20 mm, wherein the coal gangue accounts for the total mass of the coal gangue.

The coagulation curing material comprises an inorganic material and an organic material, wherein the mass ratio of the inorganic material to the organic material is preferably (90-100): 3;

the coagulated solidified material according to the present invention is characterized in that the inorganic material includes fine slag powder and the organic material includes a naphthalene-based active material and/or cellulose.

The present invention also provides a hardened body comprising a salty mud and the setting and curing material according to any of the present invention.

The hardened body provided by the invention is characterized in that the mass ratio of the salt mud to the inorganic curing agent in the setting and curing material is 1 (0.5-3); more preferably, the water content in the salty mud is 1% or less.

The invention also provides a preparation method of the hardened body, wherein the preparation method comprises the step of carrying out hydration reaction on the salt slurry by using the setting and solidifying material to obtain the hardened body.

According to the preparation method, in the hydration reaction, the mass ratio of water to the inorganic curing agent is 1 (0.3-0.5), and the hydration reaction time is 90-180 s.

ADVANTAGEOUS EFFECTS OF INVENTION

The condensation curing material can efficiently adsorb harmful components in high-salt organic waste liquid evaporation salty mud, improve the compactness, increase the slurry viscosity of the condensation curing material, reduce the bleeding phenomenon of a cured body and improve the strength of the cured body.

Furthermore, the invention adopts the mining solid waste as the aggregate, thereby not only saving limestone resources, but also being capable of treating the mining solid waste and further reducing the manufacturing cost.

Further, the hardened body of the present invention can effectively solidify heavy metal ions in a chemically bonded and physically adsorbed form. The hardened body is low in porosity, small in permeability and good in crack resistance, and the heavy metal ions in the salt mud are wrapped in the hardened body and are difficult to migrate out of the hardened body along with pores or cracks, so that an excellent curing effect is achieved.

Furthermore, the preparation method of the hardened body is simple and feasible, has low cost of raw materials, is easy to obtain, and is suitable for mass production.

Drawings

FIG. 1 shows a process flow diagram of a method for producing a hardened body according to the invention.

Detailed Description

The present invention will be described in detail below. The technical features described below are explained based on typical embodiments and specific examples of the present invention, but the present invention is not limited to these embodiments and specific examples. It should be noted that:

in the present specification, the numerical range represented by "numerical value a to numerical value B" means a range including the end point numerical value A, B.

In the present specification, "plural" in "plural", and the like means a numerical value of 2 or more unless otherwise specified.

In this specification, the terms "substantially", "substantially" or "substantially" mean an error of less than 5%, or less than 3% or less than 1% as compared to the relevant perfect or theoretical standard.

In the present specification, "%" denotes mass% unless otherwise specified.

In the present specification, the meaning of "may" includes both the meaning of performing a certain process and the meaning of not performing a certain process.

In this specification, "optional" or "optionally" means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where the event occurs and instances where it does not.

In the present specification, reference to "some particular/preferred embodiments," "other particular/preferred embodiments," "embodiments," and the like, means that a particular element (e.g., feature, structure, property, and/or characteristic) described in connection with the embodiment is included in at least one embodiment described herein, and may or may not be present in other embodiments. In addition, it is to be understood that the described elements may be combined in any suitable manner in the various embodiments.

< first aspect >

After the industrial high-salt organic waste liquid is treated by an evaporation technology, salt and organic matters are concentrated and crystallized to form salt mud, and the salt mud has complex components, high water content and high heavy metal content and belongs to dangerous waste. The organic waste liquid is derived from industrial high-salt organic waste liquid, and the salt content is 100-300 g/L. The salt mud is produced after evaporation and crystallization treatment, and the water content of the salt mud is less than or equal to 1% after deep dehydration treatment. In view of this, a first aspect of the present invention provides a setting and curing material comprising:

an inorganic curing agent, wherein the inorganic curing agent,

mining solid waste, and

a composite admixture; wherein the content of the first and second substances,

Specifically, the curing agent of the invention is mainly used for the coagulation and curing of salt slurry, and the curing agent of the invention comprises a P.S.A 42.5 grade or P.O 42.5 grade and above strength grade curing agent. In some specific embodiments, the inorganic curing agent comprises one or a combination of two or more of a silicate (portland cement), an aluminoferrite (aluminoferrite cement), and an aluminate (aluminate cement).

The mining solid waste of the present invention is used to provide a skeleton for the solidification of the brine sludge. Specifically, the mining solid waste in the invention can contain one or a combination of more than two of stone powder, fly ash, crushed stone, coal gangue, coal ash, steel slag, desulfurized gypsum and desulfurized alkali residue.

Preferably, the mining solid waste of the present invention may comprise coal gangue and fly ash. The coal gangue and the fly ash can save limestone resources and can treat coal gangue solid waste. Meanwhile, the fly ash is used as a substitute material, so that the manufacturing cost is further reduced.

Preferably, the coal gangue is self-burning coal gangue, and preferably, the content of the coal gangue with the particle size of less than 5mm is 40-60%, the content of the coal gangue with the particle size of 5-15 mm is 30-40%, and the content of the coal gangue with the particle size of 15-20 mm is 10-20% of the total mass of the coal gangue.

The composite additive is used for assisting the solidification of salt mud and the like. The composite admixture comprises an inorganic material and an organic material, wherein the mass ratio of the inorganic material to the organic material is preferably (90-100): 3, such as: 30:1, 91:3, 92:3, 31:1, 94:3, 95:3, 32:1, 97:3, 98:3, 33:1, etc.; the inorganic material is a high-fineness inorganic material, and preferably, the average particle diameter of the high-fineness inorganic material can be 5-11 μm. More preferably, the inorganic material includes fine slag powder, and the organic material includes a naphthalene-based active material and/or cellulose.

Further, in the present invention, the organic material may include a naphthalene-based active material and cellulose. Wherein the naphthalene-based active material may be naphthalene and/or a naphthalene derivative. Specifically, the naphthalene derivative may be methylnaphthalene, ethylnaphthalene, phenylnaphthalene, nitronaphthalene, naphthol, or the like. The content of the naphthalene-based active material and the cellulose is not particularly limited in the present invention, and may be added as needed. Specifically, the mass ratio of the inorganic material, the naphthalene-based active material and the cellulose may be (90-100): (0.1-2.9): (0.1-2.9), for example: 90:1:2, 91:1:1, 92:1:1.5, 93:1.5:1, 94:2:1, 95:0.5:2.5, 96:2.5:0.5, 97:1:2, 98:0.3:2.7, 99:2.7:2, etc.

In the invention, the mass ratio of the inorganic curing agent to the mining solid waste to the composite admixture is 1 (0.3-3) to (0.005-0.1), preferably 1 (1.5-1.7) to (0.03-0.05); the mass ratio is matched to increase the viscosity of the slurry of the coagulated and solidified material, reduce the bleeding phenomenon of a solidified body and improve the strength of the solidified body. Specifically, the mass ratio of the inorganic curing agent to the mining solid waste to the composite additive is 1:1:0.01, 1:0.3:0.02, 1:0.5:0.04, 1:0.8:0.05, 1:1:0.08, 1:1.2:0.02, 1:1.5:0.04, 1:1.8:0.05, 1:2:0.05, 1:2.2:0.08, 1:2.4:0.02, 1:2.8:0.04, and 1:3: 0.05.

In some specific embodiments, when the mining solid waste of the present invention may include coal gangue and fly ash, the mass ratio of the inorganic curing agent, the coal gangue, the fly ash and the composite admixture is 1 (0.2-2): 0.1-1): 0.005-0.1, preferably 1: (0.5-1.0): (0.3-0.5): (0.03-0.05); the mass ratio is matched to efficiently adsorb harmful ingredients in the high-salinity organic waste liquid evaporated salt mud, so that the compactness is improved.

< second aspect >

A second aspect of the present invention provides a hardened body comprising a salty mud and the setting and curing material according to the first aspect of the present invention. The hardened body has low porosity, small permeability and good crack resistance, and the heavy metal ions in the salt mud are wrapped in the hardened body and are difficult to migrate out of the hardened body along with pores or cracks.

Specifically, the salt slurry is produced after evaporation crystallization treatment, and can be derived from industrial high-salt organic waste liquid, and the salt content of the industrial high-salt organic waste liquid can be 100-300 g/L.

Furthermore, the hardening body can simultaneously wrap organic matters and salt, wherein the wrapping of the organic matters is mainly adsorption, and the dissolution and migration of harmful organic matters to the outside of the hardening body are controlled by improving the compactness and the crack resistance of the three-dimensional reticular crystal-colloid composite structure.

The size, specification and the like of the hardened body are not particularly limited, different specifications and sizes can be customized according to a test mold, and the hardened body can be manufactured as a standard according to subsequent requirements.

In some specific embodiments, the mass ratio of the salt slurry to the inorganic curing agent in the setting and curing material is 1 (0.5-3), preferably 1 (0.5-1.5); for example: 1:0.8, 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2, 1:2.2, 1:2.5, 1:2.8, etc. When the mass ratio of the salt mud to the inorganic curing agent in the setting and curing material is 1 (0.5-3), the compactness and the crack resistance of the hardened body can be improved by matching the mass ratio, and harmful organic matters in the hardened body are prevented from being dissolved or migrating to the outside of the hardened body. More preferably, the water content in the salty mud is 1% or less.

< third aspect >

The third aspect of the present invention provides a method for producing a hardened body, which comprises subjecting the set and solidified material to hydration reaction with the salty mud to obtain a hardened body.

After the condensation curing material and the salt mud are subjected to hydration reaction, a formed hardening body is a three-dimensional reticular crystal-colloid composite structure which can effectively cure heavy metal ions in a form of chemical combination and physical adsorption.

Further, the pH value of the coagulation solidification material is regulated to 10-14, preferably 11-14 by using an additive, and the heavy metal is controlled to exist in the coagulation solidification material in the form of insoluble salt, so that the heavy metal ion solubility in the solution is reduced.

The three-dimensional reticular crystal-colloid composite structure generated by the hydration reaction of the active component in the condensation curing material and the salt slurry can wrap organic matters and salt simultaneously, wherein the wrapping of the organic matters is mainly adsorption, and the dissolution and migration of harmful organic matters to the outside of a hardened body are controlled by improving the compactness and the anti-cracking performance of the three-dimensional reticular crystal-colloid composite structure. The salt mud achieves the discharge standard of general solid waste after being solidified, and realizes harmless disposal.

Specifically, the preparation method comprises the following steps:

a) the inorganic curing agent, the salt slurry, the mining solid waste and the composite additive are accurately weighed according to the proportion and poured into a concrete single horizontal shaft mixer.

b) Adding tap water into the concrete single horizontal shaft mixer, and pouring out after mixing. The inorganic curing agent, the salt slurry, the mining solid waste and the composite admixture which are uniformly mixed and stirred are stirred and vibrated to form, and the hydration function of the condensation curing material and the aggregate function of the mining solid waste are fully utilized to form the concrete sample with certain mechanical strength and durability.

c) Measuring the slump of the mixture, failing to meet the requirement, and readjusting the water amount to perform a test; pouring the mixture into a test mold after the mixture is qualified, and maintaining the mixture for 28 days after the mixture is vibrated by a vibration table; specifically, the slump of the mixture is qualified when the slump is 20-40 mm, otherwise, the slump is unqualified.

In some specific embodiments, the mass ratio of water to the inorganic curing agent in the hydration reaction is 1 (0.3-0.5), and the time of the hydration reaction is 90-180 s. In addition, the hydration reaction of the present invention may be carried out at normal temperature and pressure.

The condensed and solidified material of the invention forms a compact hardened body after hydration reaction with the salt slurry, has low porosity, small permeability and good crack resistance, and wraps the heavy metal ions in the salt slurry. It is difficult to migrate out of the hardened body with the pores or cracks, and an excellent curing effect is achieved.

Examples

Embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will appreciate that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

In the embodiment, based on the total mass of the coal gangue, the content of the coal gangue with the particle size of less than 5mm is about 45%, the content of the coal gangue with the particle size of 5-15 mm is about 35%, and the content of the coal gangue with the particle size of 15-20 mm is about 15%.

The average particle size of the slag micro powder is about 5-11 μm.

Example 1

a) Taking high-salt organic waste liquid with the salt content of 100g/L, performing submerged combustion evaporation treatment to generate salt mud, performing deep dehydration treatment, accurately weighing the high-salt organic waste liquid evaporated salt mud (the water content is less than or equal to 1%), Portland slag cement (P.S.A 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1:1:1.5:0.03, and pouring the weighed mixture into a concrete single horizontal shaft stirrer, wherein the composite additive comprises an inorganic material and an organic material, the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder, the naphthalene and the cellulose is 92:1: 2.

b) Adding a proper amount of tap water into the concrete single horizontal shaft mixer, wherein the mass ratio of the tap water to the inorganic curing agent slag portland cement (P.S.A 42.5 grade) is 1:0.4, stirring for 180S, and pouring out.

c) Measuring slump of the mixture to be 30mm according to GB/T50080, pouring into a test mould, vibrating by a vibration table, and curing for 28 days.

The cured body has no air holes and the shrinkage of the cured body is less than 0.5 percent.

Example 2

a) Taking high-salt organic waste liquid with the salt content of 100g/L, generating salt mud after immersion combustion evaporation treatment, accurately weighing the high-salt organic waste liquid evaporated salt mud (the water content is less than or equal to 1 percent), slag portland cement (P.S.A 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1:1:1.5:0.05 after deep dehydration treatment, and pouring the weighed mixture into a concrete single horizontal shaft stirrer; the composite additive comprises an inorganic material and an organic material, wherein the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder to the naphthalene to the cellulose is 92:1: 2.

Example 3

a) Taking high-salt organic waste liquid with the salt content of 200g/L, generating salt mud after immersion combustion evaporation treatment, accurately weighing the high-salt organic waste liquid evaporated salt mud (the water content is less than or equal to 1 percent), slag portland cement (P.S.A 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1:1.2:1.5:0.03 after deep dehydration treatment, and pouring the weighed mixture into a concrete single-horizontal-shaft stirrer; the composite additive comprises an inorganic material and an organic material, wherein the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder to the naphthalene to the cellulose is 92:1: 2.

b) Adding a proper amount of tap water into the concrete single horizontal shaft mixer, wherein the mass ratio of the tap water to the inorganic curing agent slag portland cement (P.S.A 42.5 grade) is 1:0.4, and pouring out.

Example 4

a) Taking high-salt organic waste liquid with the salt content of 200g/L, performing submerged combustion evaporation treatment to generate salt mud, performing deep dehydration treatment, accurately weighing the high-salt organic waste liquid evaporated salt mud (the water content is less than or equal to 1 percent), common silicate (P.O 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1:1.2:1.5:0.05, and pouring the weighed mixture into a concrete single horizontal shaft stirrer, wherein the composite additive comprises an inorganic material and an organic material, the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder, the naphthalene and the cellulose is 92:1: 2.

Example 5

a) Taking high-salt organic waste liquid with the salt content of 200g/L, performing submerged combustion evaporation treatment to generate salt slurry, performing deep dehydration treatment, and then evaporating the high-salt organic waste liquid to obtain the salt slurry (the water content is less than or equal to 1 percent), ordinary portland cement (P.O 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1: accurately weighing 1.5:0.03, and pouring into a concrete single horizontal shaft mixer, wherein the composite additive comprises an inorganic material and an organic material, the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder to the naphthalene to the cellulose is 92:1: 2.

Example 6

a) Taking high-salt organic waste liquid with the salt content of 200g/L, performing submerged combustion evaporation treatment to generate salt slurry, performing deep dehydration treatment, and then evaporating the high-salt organic waste liquid to obtain the salt slurry (the water content is less than or equal to 1 percent), ordinary portland cement (P.O 42.5 grade), coal gangue and a composite additive according to the mass ratio of 1: accurately weighing the raw materials at a ratio of 1.5:0.05, and pouring the raw materials into a concrete single-horizontal-shaft mixer, wherein the composite additive comprises an inorganic material and an organic material, the inorganic material is slag micro powder, the organic material is naphthalene and cellulose, and the mass ratio of the slag micro powder to the naphthalene to the cellulose is 92:1: 2.

Performance testing

(1) Compressive strength of cured body 28d

The set and cured mortar obtained in example 2 was processed into a cylindrical (100X 100 mm) sample, cured in a standard curing oven for 28 days, and then subjected to the test for compressive strength in accordance with the requirements of GB/T17671-1999 "set and cured mortar Strength test", and the results are shown in Table 1.

TABLE 1 compression Strength of samples of hardened bodies obtained in examples 1 to 6

As can be seen from table 1: the compressive strength of all the samples is more than 7MPa, and the requirement that the compressive strength of the hardened sample is not less than 7MPa is met.

(2) Impact resistance test

The cured body samples obtained in examples 1 to 6 were subjected to a drop test from a free fall of a 9m high building onto a floor surface of a setting and curing material according to the requirements of GB 14569.1-2011, and the results are shown in Table 2.

TABLE 2 impact resistance of samples of hardened bodies obtained in examples 1 to 6

The result shows that the sample prepared by the invention only has small cracks, and the sample does not completely break, and all meets the national standard requirements.

(3) Resistance to soaking

The samples prepared in examples 1 to 6 were immersed in tap water for 90 days, and analyzed for the presence of crystal precipitation and the amount of compressive strength loss after immersion according to the evaluation standard for testing the strength of concrete in GB/T50107-2010, the results of which are shown in Table 3.

TABLE 3 samples of hardened bodies obtained in examples 1 to 6 were resistant to soaking

Experimental results show that the maximum loss of the strength of the hardened body sample after soaking is 11.5%, the average loss after soaking is 11.2%, the requirement that the strength loss of the hardened body sample after soaking is not more than 25% in the national standard GB/T50107-2010 is met, and no crystal is precipitated in all test soaked water samples.

(4) Resistance to freezing and thawing

The results of the freeze-thaw resistance test of the samples obtained in examples 1 to 6 were shown in Table 4, according to the method of GB/T33011-.

TABLE 4 Freeze-thaw resistance test on hardened samples obtained in examples 1 to 6

The experimental result shows that the maximum loss of the freeze-thaw resistance strength of the hardened body sample is 10.4%, the average loss is 9.98%, and the requirement that the strength loss of the hardened body sample after being soaked in the national standard is not more than 25% is met.

(5) Corrosivity identification

The samples prepared in examples 1 to 6 were subjected to a corrosivity identification test according to the standard for identifying hazardous waste of GB/T5085.1-2007 corrosivity identification, and the results are shown in Table 5.

TABLE 5 corrosiveness of hardened samples obtained in examples 1 to 6

The experimental result shows that the pH value of the hardened body sample is 12.2 at most, and the average value is 12.0; the corrosion rate was 1.29mm/a at the maximum and 1.20mm/a on average. According to the identification standard of national standard 'hazardous waste identification standard corrosivity identification' GB/T5085.1-2007, the solid waste which meets one of the following conditions belongs to hazardous waste. (1) The pH value of the leaching solution prepared according to GB/T15555.12-1995 is more than or equal to 12.5, or less than or equal to 2.0; (2) the corrosion rate of the steel material No. 20 specified in GB/T699 is more than or equal to 6.35mm/a under the condition of 55 ℃. Neither of the coagulated and solidified materials of the present invention satisfies these two conditions and is therefore not a hazardous waste.

(6) Identification of leaching toxicity

The samples prepared in examples 1 to 6 were subjected to a leaching toxicity discrimination experiment according to the HJ/T299-2007 sulfuric acid-nitric acid method, and the results are shown in Table 6.

TABLE 6 Leaching toxicity of hardened samples obtained in examples 1 to 6

Experimental results show that the indexes of the heavy metal ions in the leaching toxicity of the hardened body sample are all lower than those of national standard 'hazardous waste identification standard leaching toxicity identification' G5085.3-2007.

In addition, other corresponding indexes also meet the national standard of hazardous waste identification standard G5085-2007.

It should be noted that, although the technical solutions of the present invention are described in specific embodiments, those skilled in the art can understand that the present invention should not be limited thereto.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A set-curing material, comprising:

an inorganic curing agent, wherein the inorganic curing agent,

mining solid waste, and

a composite admixture; wherein the content of the first and second substances,

2. The setting and curing material as claimed in claim 1, wherein the inorganic curing agent comprises one or a combination of two or more of silicate, aluminoferrite and aluminate.

3. The setting and curing material as claimed in claim 1 or 2, wherein the mining solid waste contains one or more of stone powder, fly ash, crushed stone, coal gangue, fly ash, steel slag, desulfurized gypsum and desulfurized caustic sludge.

4. The setting and curing material as claimed in claim 4, wherein the content of coal gangue having a particle size of 5mm or less is 40 to 60%, the content of coal gangue having a particle size of 5 to 15mm is 30 to 40%, and the content of coal gangue having a particle size of 15 to 20mm is 10 to 20%, based on the total mass of the coal gangue.

5. The setting and curing material as claimed in any one of claims 1 to 4, wherein the composite admixture comprises an inorganic material and an organic material, and preferably, the mass ratio of the inorganic material to the organic material is (90-100): 3.

6. The setting and solidifying material as claimed in claim 5, wherein the inorganic material comprises fine slag powder and the organic material comprises a naphthalene-based active material and/or cellulose.

7. A hardened body comprising a salty mud and the setting and curing material according to any one of claims 1 to 6.

8. The cured product according to claim 7, wherein the mass ratio of the salt slurry to the inorganic curing agent in the setting and curing material is 1 (0.5 to 3); more preferably, the water content in the salty mud is 1% or less.

9. A method for producing a hardened body according to claim 7 or 8, comprising subjecting a set and solidified material to hydration reaction with said salt slurry to obtain a hardened body.

10. The preparation method according to claim 9, wherein the mass ratio of water to the inorganic curing agent in the hydration reaction is 1 (0.3 to 0.5), and the time of the hydration reaction is 90 to 180 seconds.