阅读说明：本技术 大修渣低温玻璃化无害化处理方法、与大修渣共熔的固熔剂及制备方法、玻璃粒料及其应用 (Low-temperature vitrification harmless treatment method for overhaul slag, solid flux co-melted with overhaul slag, preparation method of solid flux, glass granules and application of glass granules ) 是由 赵庆朝 杨航 李伟光 申士富 朱阳戈 刘海营 郑学杰 王金玲 骆有发 于 2019-10-17 设计创作，主要内容包括：本发明涉及固体废弃物处理领域,公开了与大修渣共熔的低温固熔剂,其为非晶态玻璃结构,包括合理配比的：Na<Sub>2</Sub>O、Al<Sub>2</Sub>O<Sub>3</Sub>、SiO<Sub>2</Sub>、K<Sub>2</Sub>O、TiO<Sub>2</Sub>、ZnO、BaO、P<Sub>2</Sub>O<Sub>5</Sub>。还公开了上述固熔剂的制备方法,包括将熔融后得到上述各组成的物质水淬。还公开了大修渣低温玻璃化无害化处理方法,包括将大修渣和上述低温固熔剂在700-750℃下共熔后急速冷却。及公开了无害化处理后的玻璃化粒料及其在建材领域的应用。上述低温固熔剂与大修渣能在700-750℃下共熔而不会使含氟物质溢出,水淬后得到可作为建材原料的玻璃化粒料,能将大修渣中的含氟物质固化,实现大修渣的低温玻璃化无害化处理,处理后浸出毒性满足国标要求。(The invention relates to the field of solid waste treatment, and discloses a low-temperature solid flux co-melted with overhaul slag, which is of an amorphous glass structure and comprises the following components in reasonable proportion: na (Na) 2 O、Al 2 O 3 、SiO 2 、K 2 O、TiO 2 、ZnO、BaO、P 2 O 5 . Also discloses a preparation method of the solid flux, which comprises the step of water quenching the substances with the compositions obtained after melting. Also discloses a low-temperature vitrification harmless treatment method of the overhaul slag, which comprises the steps of carrying out eutectic melting on the overhaul slag and the low-temperature solid flux at the temperature of 700-750 ℃ and then rapidly cooling. And discloses vitrified granules subjected to innocent treatment and application thereof in the field of building materials. The low-temperature solid flux and the overhaul slag can be co-melted at the temperature of 700 ℃ and 750 ℃ without causing the flux to be meltedThe fluorine-containing substances overflow and are water-quenched to obtain vitrified granules which can be used as building material raw materials, the fluorine-containing substances in the overhaul slag can be solidified, the low-temperature vitrification harmless treatment of the overhaul slag is realized, and the leaching toxicity after the treatment meets the national standard requirement.)

1. The low-temperature solid flux is characterized by being in a random amorphous glass structure and comprising main components, wherein the main components comprise the following components in percentage by mass:

Na₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、SiO₂：36.0-39.0％、K₂O：3.5-4.58％、TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％。

2. The low-temperature solid flux co-melted with overhaul slag according to claim 1, wherein the low-temperature solid flux further comprises a fluxing agent, and the content of the main component is 95.0-97.0% and the content of the fluxing agent is 3.0-6.0% in percentage by mass of the low-temperature solid flux;

preferably, the flux comprises MgO, CaO, CaF₂、Rb₂O and NaNO₃At least one of (1);

more preferably, the flux comprises, in mass percentage of the low-temperature solid-solution agent, MgO: 0.5-1.5%, CaO: 0.0-1.5% of CaF₂：0.0-3.5％、Rb₂O：0.0-2.5％、NaNO₃：1.0-3.0％；

Preferably, the low-temperature solid flux of the irregular amorphous glass structure is obtained by water quenching of a molten liquid.

3. A preparation method of a low-temperature solid flux co-melted with overhaul slag is characterized by comprising the following steps:

melting the preparation raw materials into molten glass, rapidly cooling to obtain a low-temperature solid flux with a random amorphous glass structure, and enabling main components in the low-temperature solid flux to comprise the following components in percentage by mass:

Na₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、SiO₂：36.0-39.0％、K₂O：3.5-4.58％、TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％。

4. The method for producing a low-temperature solid flux co-melted with overhaul slag according to claim 3, wherein the production raw material includes an oxide source raw material which is an oxide, a substance decomposed into an oxide during melting, or a substance decomposed into an oxide and a volatile matter during melting;

preferably, the rapid cooling mode is water quenching;

preferably, the oxide source raw materials comprise soda ash for providing sodium oxide, alumina, quartz sand or silica for providing silicon dioxide, potassium carbonate for providing potassium oxide, titanium dioxide, zinc oxide, barium carbonate for providing barium oxide, and phosphorus pentoxide;

preferably, the preparation raw material also comprises a fluxing agent, and the adding amount of the fluxing agent and the main component of the prepared low-temperature solid flux account for 3.0-6.0% and 95.0-97.0% of the low-temperature solid flux respectively in percentage by mass;

preferably, the flux comprises MgO, CaO, CaF₂、Rb₂O and NaNO₃At least one of (1);

more preferably, the flux comprises, in mass percentage of the low-temperature solid-solution agent, MgO: 0.5-1.5%, CaO: 0.0-1.5% of CaF₂：0.0-3.5％、Rb₂O：0.0-2.5％、NaNO₃：1.0-3.0％。

5. The preparation method of the low-temperature solid flux co-melted with the overhaul slag as claimed in claim 3, wherein the low-temperature solid flux obtained by melting preparation raw materials into molten glass and water quenching is:

melting the preparation raw materials into molten glass at 1450-1550 ℃;

preferably, the melting time is 1.0-5.0 h;

preferably, obtaining glass granules after water quenching, and drying the glass granules;

preferably, the glass granules are dried and then ground into powder with the particle size of less than 100 meshes to obtain the low-temperature solid flux;

preferably, the preparation raw materials are ground to a particle size of less than 100 mesh prior to melting.

6. A low-temperature vitrification harmless treatment method for overhaul residues is characterized by comprising the following steps:

according to the mass percentage, the mixture of the low-temperature solid flux prepared by the preparation method of the low-temperature solid flux which contains 10.0 to 60.0 percent of overhaul slag and 40.0 to 90.0 percent of the low-temperature solid flux as claimed in claim 1 or 2 or the low-temperature solid flux co-melted with the overhaul slag as claimed in any one of claims 3 to 5 is melted into molten glass at the temperature of 700-750 ℃ and then water quenched.

7. The low-temperature vitrification harmless treatment method of the overhaul slag as claimed in claim 6, characterized in that before melting the mixture into the molten glass, the method further comprises the steps of placing the mixture in an environment of 200-300 ℃ for heat treatment, wherein the heat treatment time is 10-30min, and collecting and treating overflowed gas in the heat treatment process;

preferably, the overflowed gas is collected by negative pressure;

preferably, the overflowed gas is treated by introducing the gas into alkali liquor for absorption;

preferably, the heating rate is 5-10 ℃/min in the heat treatment process;

preferably, after the heat treatment, the temperature is raised to 700-750 ℃ at the temperature raising rate of 5-10 ℃/min so that the mixture is melted into molten glass;

preferably, before melting the low-temperature fusing agent and the overhaul slag, grinding the overhaul slag into powder with the particle size of less than 100 meshes; more preferably, grinding the overhaul slag to a particle size of less than 100 meshes further comprises crushing the overhaul slag to a particle size of less than 2 mm;

preferably, the major components of the overhaul slag are as follows by mass fraction: 32.0-35.0% SiO₂、4.5-6.5％Fe₂O₃、33.0-39.0％Al₂O₃、0.5-2.5％CaO、13.5-16.0％Na₂O、0.5-2.5％TiO₂、2.0-6.0％F。

8. The low-temperature vitrification harmless treatment method for the overhaul slag as claimed in claim 6, characterized in that the melting time of the mixture at the temperature of 700-750 ℃ is 120-180 min;

preferably, the water quenching mode is as follows: after removing the upper unmelted carbon layer of the container containing the molten glass liquid, pouring the lower molten glass liquid into water or putting the whole container containing the molten glass liquid into water to obtain the glass granules.

9. Glass granules obtained by the low-temperature vitrification harmless treatment method of the overhaul slag according to any one of claims 6 to 8.

10. Use of the vitrified pellet as defined in claim 9 in the field of construction.

Technical Field

The invention relates to the technical field of solid waste treatment, in particular to a low-temperature vitrification harmless treatment method of overhaul slag, a solid flux co-melted with the overhaul slag, a preparation method of the solid flux, glass granules and application of the glass granules.

Background

The electrolytic cell is a key device for aluminum electrolysis production, because the carbon cathode has good wettability to electrolyte molten salt, the cathode lining is inevitably eroded by electrolyte, aluminum liquid and the like, so that the lining of the electrolytic cell is damaged, the electrolytic cell needs to be maintained and replaced after working for 2-3 years, the main components of the replaced overhaul cell are waste cathode (anode) carbon blocks, refractory materials, anti-seepage materials and the like, and a certain amount of anode carbon particles are generated in the aluminum electrolysis process. Because the difference of the electric capacity, the lining structure, the lining material type, the electrolysis process condition, the operation system and the service life of the cell of each electrolytic aluminum plant is large, the composition of the waste is also large, but the main components are basically the same.

The overhaul slag of the aluminum electrolytic cell produced in the electrolytic aluminum industry of China every year is about 25 ten thousand tons, and has accumulated piling of more than 200 ten thousand tons, most electrolytic aluminum plants do not effectively treat and recycle the overhaul slag, and a storage yard which is subjected to anti-seepage treatment is mainly adopted for open-air piling or landfill treatment, so that a large amount of land is occupied, resource waste is caused, and the raised dust can seriously pollute the atmospheric environment. Meanwhile, the overhaul residues belong to dangerous waste, fluoride and cyanide in the overhaul residues are easy to separate out after meeting water, and if the overhaul residues are discarded at will, harmful components in the overhaul residues can flow into rivers along with rainwater and permeate into soil and underground water, so that the overhaul residues seriously pollute the surrounding environment, soil filling and the underground water.

Aiming at the hazardous waste such as overhaul slag, when harmless treatment is carried out, the currently common means is to use acid or other chemical substances to dissolve soluble fluoride in the overhaul slag, the method has certain defects, although the acid or other chemical substances can be used for dissolving the fluoride in the overhaul slag, the solubility is limited, a large amount of fluoride can not be dissolved, even if the leaching toxicity of the treated product meets the requirement, the fluoride in the product still exceeds the standard limit value of the hazardous waste in the national standard, and the product still needs to be controlled according to the management requirement of the hazardous waste.

Disclosure of Invention

The invention provides a low-temperature solid flux co-melted with overhaul slag and a preparation method thereof, aiming at providing a low-temperature solid flux which can be co-melted with the overhaul slag at the temperature of no fluorine overflow so as to realize the harmless treatment of the final overhaul slag.

The invention provides a method for curing overhaul slag, aiming at reducing the difficulty of harmless treatment of the overhaul slag.

The glass granules provided by the invention can be recycled as raw materials of building materials.

The invention is realized by the following steps:

in a first aspect, the embodiments of the present invention provide a low temperature solid melting method for co-melting with overhaul slagThe low-temperature solid flux is of a random amorphous glass structure, comprises the following main components in percentage by mass: na (Na)₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、 SiO₂：36.0-39.0％、K₂O：3.5-4.58％、TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％。

In a second aspect, an embodiment of the present invention provides a method for preparing a low-temperature solid flux co-melted with overhaul slag, including:

melting the preparation raw materials into molten glass, water quenching to obtain the low-temperature solid flux, wherein the low-temperature solid flux comprises the following main components in percentage by mass: na (Na)₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、 SiO₂：36.0-39.0％、K₂O：3.5-4.58％、TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％；

In a third aspect, an embodiment of the present invention provides a low-temperature vitrification harmless treatment method for overhaul residues, including:

the mixture containing 10.0-60.0% of overhaul slag and 40.0-90.0% of low-temperature solid flux as in the previous embodiment or the preparation method of the low-temperature solid flux co-melted with the overhaul slag as in any one of the previous embodiments is melted into molten glass at the temperature of 700-750 ℃ and then water quenched.

In a fourth aspect, embodiments of the present invention provide a glass pellet treated by the low-temperature vitrification harmless treatment method of the overhaul slag according to any one of the previous embodiments.

In a fifth aspect, embodiments of the present invention provide the use of glass pellets as in the previous embodiments in the field of construction.

The invention has the following beneficial effects:

according to the low-temperature solid flux co-melted with the overhaul slag, which is obtained through the design, as the low-temperature solid flux is of a random amorphous glass structure, the melting temperature of the low-temperature solid flux of the structure is low, and the reasonable component content design is combined under the condition, a system formed when the low-temperature solid flux and the overhaul slag are co-melted can be melted at the temperature of 700-750 ℃, the fluorine-containing substances in the overhaul slag cannot overflow due to the melting at the temperature, molten glass is formed, glass granules formed after the molten glass is quenched with water can realize the harmless treatment of the overhaul slag, and the formed glass granules can be applied to the field of buildings, and simultaneously, the waste recycling is realized.

The low-temperature solid flux co-melted with the overhaul slag is obtained through the design, the preparation method is simple, and the low-temperature solid flux co-melted with the overhaul slag provided by the invention can be prepared.

According to the solidification method of the overhaul slag obtained through the design, the overhaul slag and the low-temperature solid flux provided by the invention are co-melted, so that the mixture of the overhaul slag and the low-temperature solid flux can be molten into molten glass at the temperature of 700-750 ℃, no fluorine-containing substance overflows in the melting process, the environmental pollution is avoided, and the molten glass can be subjected to water quenching to obtain a vitreous body, so that the fluorine-containing substance in the overhaul slag is solidified into the vitreous body, and the vitreous body obtained through solidification meets the standard of common solid wastes.

The glass granules obtained by the design are obtained by solidifying the overhaul slag by the overhaul slag solidification method, so that the cost is low, the overflow of fluoride is less, and cyanide is pyrolyzed. The glass aggregate can be used as a building material to be applied to the field of buildings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is an X-ray diffraction pattern of overhaul slag solidified by the method provided by the embodiment of the invention;

FIG. 2 is a flow chart of a process for preparing a low-temperature solid flux;

FIG. 3 is a flow chart of the overhaul slag solidification process.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 available commercially.

The low-temperature fusing agent co-melted with the overhaul slag and the preparation method thereof, the low-temperature vitrification harmless treatment method of the overhaul slag, the glass granules and the application thereof provided by the embodiment of the invention are specifically explained below.

A low-temperature solid flux co-melted with overhaul residues is of a random amorphous glass structure and comprises the following main components in percentage by mass:

Na₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、SiO₂：36.0-39.0％、K₂O：3.5-4.58％、 TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％。

Because the microstructure of the low-temperature solid flux is a random amorphous structure and the melting temperature of the amorphous structure is low, the low-temperature solid flux with the components and the overhaul slag can be melted into glass liquid when being heated at the temperature of 700-750 ℃, and compared with the existing mode of melting and solidifying the overhaul slag into a glass body, the melting temperature is greatly reduced. When the overhaul slag and the low-temperature solid flux with the component content are co-melted at the temperature of 700-750 ℃, the fluorine-containing substances in the overhaul slag cannot overflow, molten glass is formed, glass granules are formed after water quenching of the glass liquid, the harmless treatment of the overhaul slag can be realized, and the formed glass granules can be applied to the field of buildings and can be recycled.

Preferably, the low-temperature solid flux also comprises a fluxing agent, and the content of the main component in the low-temperature solid flux is 95.0-97.0% and the content of the fluxing agent is 3.0-6.0% in percentage by mass of the low-temperature solid flux.

The fluxing agent contained in the low-temperature solid flux can melt the preparation raw materials of the low-temperature solid flux at a lower temperature in the preparation process of the low-temperature solid flux, so that the preparation raw materials of the low-temperature solid flux are fully melted in the preparation process of the low-temperature solid flux, the energy consumption in the preparation process of the low-temperature solid flux can be reduced, the volatilization of effective components in the melting process is avoided, and the large error between the content of each component of the prepared product and a preset value is avoided; the fluxing agent can also reduce the viscosity of the high-temperature melt, increase the fluidity and clarify and homogenize the high-temperature melt. Specifically, the fluxing agent comprises MgO, CaO and CaF₂、Rb₂O and NaNO₃At least one of them. Preferably, in order to make the fluxing effect better, the fluxing agent comprises MgO: 0.5-1.5%, CaO: 0.0-1.5% of CaF₂：0.0-3.5％、Rb₂O：0.0-2.5％、 NaNO₃：1.0-3.0％。

The embodiment of the invention provides a preparation method of a low-temperature solid flux co-melted with overhaul slag, which comprises the following steps:

melting the preparation raw materials into molten glass, rapidly cooling to obtain a low-temperature solid flux with a random amorphous glass structure, and enabling main components in the low-temperature solid flux to comprise the following components in percentage by mass:

Na₂O：20.0-22.47％、Al₂O₃：3.5-6.5％、SiO₂：36.0-39.0％、K₂O：3.5-4.58％、 TiO₂: 3.5-4.08%, ZnO: 16.0-20.0%, BaO: 3.41-6.0% and P₂O₅：0.5-2.0％。

The melting temperature of the basic batch of the low-temperature solid flux is generally over 1400 ℃, the prepared raw materials are rapidly cooled after being melted at high temperature, the crystal structure of the original raw materials can be broken, and the amorphous vitreous body low-temperature solid flux with an irregular structure can be obtained, so that the low-temperature solid flux obtained after rapid cooling can be melted at a lower temperature, the content of the components of the curing agent is reasonably designed under the condition, and the temperature of co-melting of overhaul residues and the low-temperature solid flux can be greatly reduced.

The rapid cooling mentioned in the present invention refers to any method that can make the low-temperature solid flux obtained after temperature reduction exhibit an amorphous structure, and the rapid cooling method in each embodiment of the present invention is water quenching.

Preferably, the preparation raw material includes an oxide source raw material, which is an oxide, a substance decomposed into an oxide during melting, or a substance decomposed into an oxide and a volatile during melting.

Preferably, in the present invention, the oxide source raw materials are selected from the following substances which are readily available, low in cost, and do not generate environmental pollutants after melting: soda ash to provide sodium oxide, alumina, silica sand or silica to provide silicon dioxide, potassium carbonate to provide potassium oxide, titanium dioxide, zinc oxide, barium carbonate to provide barium oxide, phosphorus pentoxide.

Preferably, in the invention, the preparation raw materials also comprise a fluxing agent, and the adding amount of the fluxing agent and the mass percentage of the main components of the prepared low-temperature solid flux in the low-temperature solid flux are respectively 3.0-6.0% and 95.0-97.0%; preferably, the flux comprises MgO, CaO, CaF₂、Rb₂O and NaNO₃At least one of (1); more preferably, the low-temperature solid-solution agent comprises MgO: 0.5-1.5%, CaO: 0.0-1.5% of CaF₂：0.0-3.5％、Rb₂O：0.0-2.5％、NaNO₃：1.0-3.0％。

The fluxing agent is added in the process of preparing the low-temperature solid flux, so that the preparation raw materials of the low-temperature solid flux can be melted at a lower temperature, and the preparation raw materials of the low-temperature solid flux can be fully melted in the process of preparing the low-temperature solid flux, so that the energy consumption in the preparation process of the low-temperature solid flux can be reduced, the volatilization of effective components in the melting process can be avoided, and the large error between the content of each component of the prepared product and the preset value can be avoided; the fluxing agent can also reduce the viscosity of the high-temperature melt, increase the fluidity and clarify and homogenize the high-temperature melt.

As shown in fig. 2, the preparation method specifically includes:

grinding: the main components contained in the raw materials for preparation and the flux are ground to a particle size of less than 100 mesh, where particle size of less than 100 mesh means that the obtained powder is a powder passing through a 100 mesh sieve. The components can be uniformly mixed by grinding the powder to the particle size of less than 100 meshes, and the phase structure of the prepared low-temperature solid flux can be further ensured to be more uniform.

Preparing materials: the obtained powder is weighed according to the mixture ratio of the components.

Mixing materials: then the weighed components are put into a mixer to be mixed evenly.

Melting: the evenly mixed powder material is sent into a high temperature furnace for melting, the melting temperature is 1450-.

Water quenching: and quickly pouring the molten glass into water to obtain the basic glass granules.

And (3) finished product low-temperature fusing agent: and drying the obtained basic glass granules, and then grinding the dried basic glass granules into powder with the particle size of less than 100 meshes to obtain the finished product low-temperature solid fusing agent, wherein the particle size of less than 100 meshes means that the obtained powder is powder which is sieved by a 100-mesh sieve. The low-temperature solid solvent is crushed to the grain size of less than 100 meshes, so that the high-temperature solid solvent and the overhaul residues are mixed more uniformly when being co-melted.

The embodiment of the invention provides a low-temperature vitrification harmless treatment method for overhaul residues, which comprises the following steps:

according to the mass percentage, the mixture containing 10.0 to 60.0 percent of overhaul slag and 40.0 to 90.0 percent of low-temperature solid flux provided by the embodiment of the invention or the low-temperature solid flux prepared by the preparation method of the low-temperature solid flux co-melted with the overhaul slag provided by the embodiment of the invention is melted into molten glass at the temperature of 700 ℃ and 750 ℃ and then water quenched.

The harmless treatment method is characterized in that the overhaul slag and the low-temperature solid flux provided by the invention are co-melted, so that the mixture of the overhaul slag and the low-temperature solid flux can be melted into molten glass at the temperature of 700 plus 750 ℃, no fluorine-containing substance overflows in the melting process, the environmental pollution is avoided, the molten glass can be water-quenched to obtain a vitreous body, the fluorine-containing substance in the overhaul slag is solidified into the vitreous body, and the vitreous body obtained by solidification meets the standard of general solid wastes.

The chemical composition of the overhaul slag subjected to harmless treatment in the preferred embodiment of the invention is as follows: 32.0-35.0% SiO₂、4.5-6.5％Fe₂O₃、33.0-39.0％Al₂O₃、0.5-2.5％CaO、 13.5-16.0％Na₂O、0.5-2.5％TiO₂2.0-6.0% of F. FIG. 1 is an X-ray diffraction pattern of the cured overhaul slag of various embodiments of the present invention.

As shown in fig. 3, the low-temperature vitrification harmless treatment method of the overhaul slag specifically comprises the following steps:

crushing: crushing the sorted overhaul residues to 2mm by using a crusher so as to facilitate subsequent grinding; and (3) grinding the crushed overhaul slag on a ball mill or a vibration mill until the grain diameter of the overhaul slag is less than 100 meshes, so that the obtained overhaul slag powder is more convenient to be uniformly mixed with a low-temperature solid solvent.

Preparing materials: the materials are weighed and proportioned according to the mass percent of 10.0-60.0% of overhaul slag and 40.0-90.0% of low-temperature solid-solution agent.

Mixing materials: and (3) placing the weighed overhaul slag powder and the low-temperature solid flux powder into a mixer to be uniformly mixed to obtain the basic mixture of the overhaul slag and the low-temperature solid flux.

Melting: the basic mixture is put into a crucible and put into a muffle furnace for melting, the temperature is firstly raised to 200-300 ℃ at the temperature raising rate of 5-10 ℃/min, and the temperature is firstly preserved for 10-30min at the temperature of 200-300 ℃. And (3) preserving the heat for 10-30min at the temperature to ensure that cyanide contained in the overhaul slag overflows in a gas form, and collecting the cyanide by adopting negative pressure after the cyanide overflows and introducing the cyanide into alkali liquor for absorption treatment. The first temperature rise process is preferably controlled to be 5-10 ℃/min to ensure faster temperature rise, but the problem that organic matters contained in the overhaul slag cannot be fully decomposed and dissolved in molten liquid due to too fast temperature rise can be avoided, the problem that air holes exist in subsequently prepared glass bodies, and the problem that the glass body resource utilization is influenced due to too large loss in later-stage glass body resource utilization is avoided.

And after the first heat preservation is finished, continuing heating, secondarily heating to 700-750 ℃ at the heating rate of 5-10 ℃/min, and secondarily preserving heat for 120-180min at the temperature of 700-750 ℃ so as to completely melt the overhaul slag and the low-temperature solid solvent to obtain molten glass liquid.

Water quenching: and taking out the crucible containing the molten glass liquid in the previous step, quickly scraping the carbon slag layer which is not melted on the upper layer of the molten glass liquid to avoid the influence of the carbon which is not melted on the quality of the prepared glass granules, pouring the glass liquid on the lower layer into water or quickly putting the whole crucible into the water to obtain water-quenched glass granules, and solidifying harmful substances in the overhaul slag by using the obtained water-quenched glass granules.

The glass granules provided by the embodiment of the invention are obtained by adopting the low-temperature vitrification harmless treatment method for the overhaul residues provided by the invention. The glass granules are prepared from wastes, and the production cost is low. The glass aggregate can be used as a building material to be applied to the field of buildings.

In the following preferred embodiment provided by the invention, the selected quartz sand, titanium dioxide and fluorite powder are analytically pure, and the purity is close to 100%, so that the purity is approximately calculated as pure oxide.

The features and properties of the present invention are described in further detail below with reference to examples.