Gold tailings and neutralized slag sintered haydite and preparation method thereof

Abstract

The application provides a kind of gold tailings and neutralization slag sintered haydite and its preparation method, relating to the technical field of environmental protection and solid waste comprehensive treatment.The preparation method uses gold tailings as main raw material, with acid mine wastewater neutralization slag as fluxing agent and binder, through granulation, drying, preheating, calcination and other processes to obtain light-weight haydite.The prepared haydite product meets the relevant environmental protection requirements of "Solid Waste Recycling Pollution Prevention and Control Technology Guidelines" (HJ 1091), realizes the full resource utilization of gold tailings, neutralization slag and other solid wastes, and the haydite has excellent performance, high cylinder compressive strength, low water absorption and small bulk density.The preparation method has the advantages of high preparation efficiency and low cost, and has good economic, environmental and social benefits.

Description

Technical Field

[0001] This invention relates to the field of environmental protection and comprehensive solid waste management technology, and in particular to a sintered ceramic pellet of gold tailings and neutralization slag and its preparation method. Background Technology

[0002] Expanded ceramsite is a type of man-made lightweight aggregate with excellent properties such as high strength, heat insulation, thermal insulation, frost resistance, and impermeability. It is widely used in chemical, petroleum, wastewater treatment, and building materials industries. Traditionally, the raw materials for preparing expanded ceramsite are generally shale and clay. Currently, the preparation of inexpensive expanded ceramsite using solid waste such as tailings and biological sludge has become a research hotspot.

[0003] Gold tailings are a type of solid waste generated after gold ore is processed through beneficiation or gold extraction processes. Their chemical composition includes silicon dioxide, aluminum oxide, and potassium oxide. While gold mining and production drive economic development, they also generate large quantities of tailings. Currently, the main method of disposing of gold tailings is to pile them up in tailings ponds, occupying significant land resources and polluting the atmosphere, surface water, and groundwater under natural conditions such as wind and rain. With the continuous discharge of tailings and the increasing height of tailings dams, safety hazards also arise. Therefore, the resource utilization of gold tailings is urgently needed. Currently, the main ways to comprehensively utilize gold tailings are to recover valuable metals, produce building materials, and use them as mine filler materials, with 43% of tailings used for building material production.

[0004] Sulfur-rich deposits in non-ferrous metal mines contain a large amount of sulfide minerals. Under the influence of air, water, and microorganisms, these minerals undergo a series of physicochemical and biochemical reactions, including weathering, leaching, oxidation, and hydrolysis, gradually forming acidic liquids containing sulfuric acid, which severely pollute the surrounding environment. Currently, most acidic mine wastewater is treated chemically, generating a large amount of neutralization slag in the neutralization process. The slag's main components are calcium sulfate, metal hydroxides, and silicon dioxide. This neutralization slag is not currently being effectively utilized and is simply dumped in waste dumps, wasting significant amounts of land and posing potential environmental pollution risks. Therefore, the effective disposal and utilization of neutralization slag is urgently needed.

[0005] In the prior art, Chinese invention patent CN114751766A discloses a method for producing lightweight ceramsite from solid waste. Although the utilization rate of gold tailings is high—65%–80% of gold tailings, 5%–17% of waste incineration fly ash as raw material, and 15–20% of contaminated soil are mixed with water to improve the utilization rate of gold tailings—the effective utilization of neutralization slag has not been achieved.

[0006] In view of this, it is indeed necessary to propose a method for preparing sintered ceramic particles from gold tailings and neutralization slag to solve the above problems. Summary of the Invention

[0007] To address the shortcomings of the existing technology, the present invention aims to provide a method for preparing sintered ceramsite from gold tailings and neutralization slag, which achieves the goal of preparing ceramsite from gold tailings and neutralization slag by rationally designing parameters such as raw material ratio and calcination temperature.

[0008] To achieve the above objectives, the present invention provides a method for preparing sintered ceramsite from gold tailings and neutralization slag, comprising the following steps:

[0009] S1, Preparation: Mix 75-90 parts of gold tailings and 10-25 parts of acidic mine wastewater treatment neutralization slag with water to prepare a mixture containing spherical cores;

[0010] S2, Pelletizing and Screening: The mixture obtained in step S1 is transferred into a pelletizing device, the water content is adjusted and prepared to form pellets, and the pellets are screened to select pellets with a diameter of 10-20 mm and a water content of 20%-30% as wet raw pellets.

[0011] S3, Drying and dehydration: The wet raw material balls obtained in step S2 are dried and dehydrated to obtain dry raw material balls;

[0012] S4, Firing: The dry raw material balls obtained in step S3 are transferred to a calcining furnace, preheated, calcined, and cooled to obtain ceramsite.

[0013] As a further improvement of the present invention, in step S1, the gold tailings contain silicon dioxide and aluminum oxide; the sum of the contents of silicon dioxide and aluminum oxide in the gold tailings is greater than 70%.

[0014] As a further improvement of the present invention, in step S1, the main components of the neutralization slag for the treatment of acidic mine wastewater are calcium sulfate, metal hydroxides and silicon dioxide; the silicon dioxide content in the neutralization slag for the treatment of acidic mine wastewater is less than 20%, the calcium sulfate content is greater than 60%, and the sum of the alkali metal hydroxide content is greater than 15%.

[0015] In step S1, the proportion of gold tailings below -200 mesh is more than 80%; the proportion of acidic mine wastewater treatment slag below -200 mesh is more than 90%.

[0016] As a further improvement of the present invention, step S1 specifically involves: transferring 75-90 parts by weight of gold tailings and 10-25 parts by weight of acidic mine wastewater treatment neutralization slag into a pre-wetting mixer for mixing; during the mixing process, adding an appropriate amount of water to the pre-wetting mixer to obtain a wet material with a moisture content of 1 / 3 to 1 / 2 of the moisture content of the wet raw material balls; continuing to mix the wet material to obtain a mixture containing ball cores.

[0017] As a further improvement of the present invention, step S2 specifically involves: transferring the mixture from step S1 into a pelletizing device, adding water during the rolling process of the mixture, controlling the moisture content of the pellets prepared by rolling to be 20% to 30%, and then screening the pellets to select pellets with a diameter of 10 to 20 mm as wet raw pellets.

[0018] As a further improvement of the present invention, step S3 specifically involves: transferring the wet raw material balls prepared in step S2 to a drying device, drying and dehydrating them at a drying temperature of 105±5℃ for 4 to 8 hours, and allowing the dried raw material balls to fall naturally without breaking within a range of 1 to 2 meters above the ground, thereby obtaining the dry raw material balls.

[0019] As a further improvement of the present invention, step S4 specifically involves: placing the dry raw material pellets prepared in step S3 into a rotary kiln, controlling the furnace temperature to rise from room temperature to 400-500°C at a heating rate of 5-20°C / min for preheating for 10-20 minutes; after preheating, controlling the furnace temperature to rise to 800-850°C at a heating rate of 5-40°C / min, holding for 10-30 minutes, and then continuing to raise the furnace temperature to 1000-1200°C at a heating rate of 5-40°C / min, holding for 20-60 minutes to obtain calcined ceramsite; after calcination, the ceramsite is naturally cooled in convective air to obtain sintered ceramsite.

[0020] To achieve the above objectives, the present invention also provides sintered ceramsite of gold tailings and neutralization slag, which is prepared by the preparation method of sintered ceramsite of gold tailings and neutralization slag described in any of the foregoing technical solutions.

[0021] The beneficial effects of this invention are:

[0022] 1. The method for preparing sintered ceramsite from gold tailings and neutralization slag provided by the present invention involves high-temperature roasting, which decomposes pollutants such as cyanide and COD in the gold tailings in the raw materials. In addition, some of the heavy metals in the solid waste are transferred to the dust with the high-temperature flue gas, and some are fixed in the glass phase and crystal lattice of the ceramsite. This makes the ceramsite product meet the relevant environmental protection requirements of the "Technical Guidelines for Pollution Prevention and Control of Solid Waste Recycling" (HJ 1091), and realizes the harmless resource utilization of solid wastes such as gold tailings and neutralization slag.

[0023] 2. The method for preparing sintered ceramsite from gold tailings and neutralization slag provided by this invention fully utilizes the calcium sulfate contained in the neutralization slag, which acts as a good binder during the granulation stage, significantly improving the strength of the raw material pellets. Through high-temperature decomposition, calcium oxide and sulfur dioxide are formed. On the one hand, this significantly reduces the roasting temperature for sintering ceramsite from gold tailings, allowing for the production of high-performance ceramsite at 1000–1200℃. On the other hand, sulfur dioxide acts as a foaming agent, significantly increasing the internal porosity of the ceramsite and reducing its density. This method has the advantages of high preparation efficiency, low energy consumption, low cost, and excellent ceramsite performance (high compressive strength, low water absorption, and low bulk density).

[0024] 3. The method for preparing sintered ceramsite from gold tailings and neutralization slag provided by this invention, taking into account the resource occurrence characteristics of gold tailings and neutralization slag, and combining current ceramsite production technology, utilizes rationally designed process parameters such as material ratios to sequentially process gold tailings and neutralization slag through material preparation, pelletizing and screening, drying and dehydration, and sintering, thereby achieving the resource utilization of solid waste. Based on the above approach, the method provided by this invention can improve the comprehensive utilization rate of solid waste and reduce the environmental pollution risks caused by its stockpiling.

[0025] 4. The method for preparing sintered ceramsite from gold tailings and neutralization slag provided by this invention is simple, safe and reliable in operation, and requires no external additives. It can realize the resource utilization of bulk solid waste, and has significant economic, environmental and social benefits, providing a new approach for the comprehensive utilization of mine solid waste. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the process flow for preparing sintered ceramic particles from gold tailings and neutralization slag provided in Example 1. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0029] Additionally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] This invention provides a method for preparing sintered ceramsite from gold tailings and neutralization slag, comprising the following steps:

[0031] S1, Preparation: Mix 75-90 parts of gold tailings and 10-25 parts of acidic mine wastewater treatment neutralization slag with water to prepare a mixture containing spherical cores;

[0032] S2, Pelletizing and Screening: The mixture obtained in step S1 is transferred into a pelletizing device, the water content is adjusted and prepared to form pellets, and the pellets are screened to select pellets with a diameter of 10-20 mm and a water content of 20%-30% as wet raw pellets.

[0033] S3, Drying and dehydration: The wet raw material balls obtained in step S2 are dried and dehydrated to obtain dry raw material balls;

[0034] S4, Firing: The dry raw material balls obtained in step S3 are transferred to a calcining furnace, preheated, calcined, and cooled to obtain ceramsite.

[0035] In step S1, the chemical composition of the gold tailings is silicon dioxide, aluminum oxide, potassium oxide, etc.; the sum of the contents of silicon dioxide and aluminum oxide in the gold tailings is greater than 70%; and the proportion of gold tailings below -200 mesh is more than 80%.

[0036] The main components of the neutralization slag for treating acidic mine wastewater are calcium sulfate, metal hydroxides, and silicon dioxide; the silicon dioxide content in the neutralization slag is less than 20%, the calcium sulfate content is greater than 60%, and the total content of alkali metal hydroxides is greater than 15%.

[0037] In the treatment of acidic mine wastewater, the proportion of neutralizing slag below 200 mesh is over 90%.

[0038] Specifically, in step S1, 75-90 parts by weight of gold tailings and 10-25 parts by weight of acidic mine wastewater treatment neutralization slag are transferred into a pre-wetting mixer for mixing. During the mixing process, an appropriate amount of water is added to the pre-wetting mixer to obtain a wet material with a moisture content of 1 / 3 to 1 / 2 of the moisture content of the wet raw material balls. The wet material is then stirred to obtain a mixture containing ball cores.

[0039] In step S2, the mixture obtained in step S1 is transferred into a pelletizing device. Water is added during the rolling process of the mixture to control the moisture content of the pellets prepared by rolling to be 20% to 30%. Then, the pellets are screened to select pellets with a diameter of 10 to 20 mm as wet raw pellets.

[0040] In step S3, the wet raw material balls prepared in step S2 are transferred to a drying device and dried at a drying temperature of 105±5℃ for 4 to 8 hours. The dried raw material balls are allowed to fall naturally without breaking within a range of 1 to 2 meters above the ground to obtain the dry raw material balls.

[0041] In step S4, the dry raw material pellets prepared in step S3 are placed in a rotary kiln, and the temperature inside the kiln is controlled to rise from room temperature to 400-500℃ at a heating rate of 5-20℃ / min for 10-20 min. After preheating, the temperature inside the kiln is controlled to rise to 800-850℃ at a heating rate of 5-40℃ / min and held for 10-30 min. Then, the temperature inside the kiln is controlled to rise to 1000-1200℃ at a heating rate of 5-40℃ / min and held for 20-60 min to obtain calcined ceramsite. After calcination, the ceramsite is naturally cooled in convective air to obtain sintered ceramsite.

[0042] The preparation method of sintered ceramsite from gold tailings and neutralization slag provided by the present invention will be described below with reference to specific embodiments.

[0043] Example 1

[0044] S1. Material preparation: Transfer 90 parts of gold tailings and 10 parts of acidic mine wastewater treatment neutralization slag into a mixer, mix them, and add an appropriate amount of water into the mixer to obtain a mixed wet material containing spherical cores with a moisture content of 10-15%.

[0045] S2. Pelletizing and screening: The mixture is transferred into a disc pelletizer. During the rolling process of the mixture, a certain amount of water is added to make the material into pellets. The pellets are screened and the pellets with a diameter of 10-20 mm and a moisture content of 20% are selected as wet raw pellets.

[0046] S3. Drying and dehydration: Transfer the wet raw material balls to a drying oven and dry them at a drying temperature of 105°C for 3 hours to obtain the dry raw material balls. The dry raw material balls do not break when they fall naturally from a height of 1.3m above the ground.

[0047] S4. Firing: Place the dry raw material pellets in a rotary kiln and control the temperature inside the kiln to rise from room temperature to 400℃ at a rate of 15℃ / min for 10 minutes. After preheating, control the temperature inside the kiln to rise to 825℃ at a rate of 20℃ / min and hold for 20 minutes. Then, continue to raise the temperature inside the kiln to 1100℃ at a rate of 25℃ / min and hold for 30 minutes to obtain the calcined ceramsite. After calcination, the ceramsite is naturally cooled in convective air to obtain sintered ceramsite.

[0048] Example 2

[0049] S1. Material preparation: Transfer 80 parts of gold tailings and 20 parts of acidic mine wastewater treatment neutralization slag into a mixer, mix them, and add an appropriate amount of water into the mixer to obtain a mixed wet material containing spherical cores with a moisture content of 10-15%.

[0050] S2. Pelletizing and screening: The mixture is transferred into a disc pelletizer. During the rolling process of the mixture, a certain amount of water is added to make the material into pellets. The pellets are screened and the pellets with a diameter of 10-20 mm and a moisture content of 25% are selected as wet raw pellets.

[0051] S3. Drying and dehydration: The prepared wet raw material balls are transferred to a drying oven and dried and dehydrated at a drying temperature of 105°C for 4 hours to obtain the dry raw material balls. The dry raw material balls do not break when they fall naturally from a height of 1.5m above the ground.

[0052] S4. Firing: Place the dry raw material pellets in a rotary kiln and control the temperature inside the rotary kiln to rise from room temperature to 450℃ at a heating rate of 15℃ / min for 10 minutes. After preheating, control the temperature inside the rotary kiln to rise to 800℃ at a heating rate of 20℃ / min and hold for 20 minutes. Then continue to control the temperature inside the rotary kiln to rise to 1090℃ at a heating rate of 22℃ / min and hold for 20 minutes to obtain the calcined ceramsite. After calcination, the ceramsite is naturally cooled in convective air to obtain sintered ceramsite.

[0053] Example 3

[0054] S1. Material preparation: Transfer 75 parts of gold tailings and 25 parts of acidic mine wastewater treatment neutralization slag into a mixer, mix them, and add an appropriate amount of water into the mixer to obtain a mixed wet material containing spherical cores with a moisture content of 10-15%.

[0055] S2. Pelletizing and screening: The mixture is transferred into a disc pelletizer. During the rolling process of the mixture, a certain amount of water is added to make the material into pellets. The pellets are screened and the pellets with a diameter of 10-20 mm and a moisture content of 25% are selected as wet raw pellets.

[0056] S3. Drying and dehydration: The prepared wet raw material balls are transferred to a drying oven and dried and dehydrated at a drying temperature of 105°C for 4 hours to obtain the dry raw material balls. The dry raw material balls do not break when they fall naturally from a height of 1.8m above the ground.

[0057] S4. Firing: The prepared dry raw material pellets are placed in a rotary kiln, and the temperature inside the rotary kiln is controlled to rise from room temperature to 500℃ at a heating rate of 15℃ / min for 10 min. After preheating, the temperature inside the rotary kiln is controlled to rise to 850℃ at a heating rate of 20℃ / min and held for 15 min. Then, the temperature inside the rotary kiln is controlled to rise to 1080℃ at a heating rate of 25℃ / min and held for 20 min to obtain the calcined ceramsite. After calcination, the ceramsite is naturally cooled in convective air to obtain sintered ceramsite.

[0058] The following description will compare the key processes of the ceramsite prepared by the sintering method of gold tailings and neutralization slag in Examples 1 to 3 in tabular form, and further analyze and test the performance of the ceramsite sintered from gold tailings and neutralization slag of the present invention.

[0059] The main components of the gold tailings and neutralization slag used in Examples 1 to 3 of this invention are detailed in Tables 1 and 2. Among them, the gold tailings below -200 mesh account for more than 85%, and the neutralization slag from the treatment of acidic mine wastewater accounts for more than 90%. The key process parameters for preparation are detailed in Table 3.

[0060] Table 1. Composition of Gold Tailings Raw Materials (%)

[0061]

[0062] Table 2. Composition of neutralization slag raw materials (%)

[0063] Components Calcium sulfate silicon dioxide other content(%) 62 18 20

[0064] Comparative Example 1

[0065] Comparative Example 1 provides a method for preparing ceramsite using solid waste. The difference between this method and Example 1 is that the neutralization residue is not used and the raw material is 100% gold tailings. The key process parameters are shown in Table 3.

[0066] Comparative Example 2

[0067] Comparative Example 2 provides a method for preparing sintered ceramic particles from gold tailings and neutralization slag. The difference from Example 1 is that the raw material composition in step S1 is 70% gold tailings + 30% neutralization slag, and other key process parameters are shown in Table 3.

[0068] Table 3 Key process parameters for the preparation of expanded clay aggregate

[0069]

[0070]

[0071] As shown in Table 3 above, in Examples 1-3, the dry raw material balls do not break when dropped from a height of 1.0-2.0 meters, exhibiting high strength. Furthermore, from Example 1 to Example 3, the strength of the dry raw material balls increases significantly with the increase in the content of neutralizing slag (the maximum height without breaking increases), indicating that the neutralizing slag acts as a binder. The strength of the dry raw material balls containing neutralizing slag is significantly higher than that of the dry raw material balls from pure gold tailings ceramsite, indicating that the neutralizing slag has good plasticity. Compared to ceramsite made from 100% gold tailings or 70% gold tailings + 30% neutralizing slag, the ceramsite produced by this invention using solid waste has a lower calcination temperature and lower bulk density, reducing energy consumption in the production of ceramsite from solid waste while improving efficiency.

[0072] Table 4 shows the properties of the ceramsite prepared by the method of firing ceramsite using solid waste in Examples 1 to 3 of this invention.

[0073] Table 4 Properties of Ceramsite

[0074]

[0075]

[0076] As shown in Table 4 above, in Examples 1 to 3, the ceramsite prepared by the method of the present invention has high compressive strength, low water absorption, low bulk density, and high compressive strength. Moreover, as the amount of neutralization residue added increases, the bulk density gradually decreases, but the compressive strength is not significantly affected, meeting the performance requirements of ceramsite with a density of 600 to 800.

[0077] The following description also includes a test of the concentration of leached heavy metals in the ceramsite prepared by the method of preparing sintered ceramsite from gold tailings and neutralization slag of the present invention. The specific results are shown in Table 5 below.

[0078] Table 5. Limits for heavy metal content that can be leached from expanded clay aggregate.

[0079]

[0080] Note: Unless otherwise noted, the units for the indicators in the table are μg / L. That is, the units for the data in Examples 1-3 are μg / L.

[0081] As can be seen from Table 5 above, in Examples 1 to 3, the concentration of heavy metals in the leachate of the prepared ceramsite is far lower than the limit of heavy metal concentration in leachate specified in the Technical Guidelines for Pollution Prevention and Control of Solid Waste Recycling (HJ 1091-2020).

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for the production of sintered haydite from gold tailings and neutralized slag, characterized by, It comprises the following steps: S1, preparation: according to mass fraction, 75-90 parts of gold tailings, 10-25 parts of acid mine drainage neutralization slag are mixed with water to prepare a mixture containing a core; wherein the gold tailings contain silicon dioxide, aluminum oxide; the sum of the contents of silicon dioxide and aluminum oxide in the gold tailings is greater than 70%; the main components of the acid mine drainage neutralization slag are calcium sulfate, metal hydroxide and silicon dioxide; the silicon dioxide content in the acid mine drainage neutralization slag is less than 20%, the calcium sulfate content is greater than 60%, and the alkali metal hydroxide content is greater than 15%; S2, balling and screening: the mixture obtained in step S1 is transferred into a balling device, the water amount is adjusted and prepared for balling, and the prepared material balls are screened, and the material balls with a diameter of 10-20 mm and a water content of 20%-30% are selected as wet green balls; S3, drying and dewatering: the wet green balls obtained in step S2 are dried and dewatered to obtain dry green balls; S4, firing: the dry green balls obtained in step S3 are transferred to a calcining furnace, preheated, calcined and cooled to obtain ceramic granules.

2. The method as claimed in claim 1, wherein the gold tailings and neutralized slag sintered haydite is prepared by the steps of: The gold tailings-200 mesh accounts for more than 80%.

3. The method for preparing sintered ceramsite from gold tailings and neutralization slag according to claim 1, characterized in that, The acid mine drainage neutralization slag-200 mesh accounts for more than 90%.

4. The method as claimed in claim 1, wherein the method of manufacturing sintered haydite from gold mine tailings and neutralized slag comprises the steps of: The step S1 comprises the following process: according to mass fraction, 75-90 parts of gold tailings, 10-25 parts of acid mine drainage neutralization slag are transferred into a pre-wetting mixer for stirring; during the stirring process, an appropriate amount of water is added to the pre-wetting mixer to obtain wet material with a water content of 1 / 3-1 / 2 of the water content of the wet green balls; the wet material is continuously stirred to obtain a mixture containing a core.

5. The method for preparing sintered ceramsite from gold tailings and neutralization slag according to claim 1, characterized in that, The step S2 comprises the following process: the mixture obtained in step S1 is transferred into a balling device, water is added during the rolling of the mixture, the water content of the rolling material balls is controlled to be 20%-30%, and then the material balls are screened to select material balls with a diameter of 10-20 mm as wet green balls.

6. The method as claimed in claim 1, wherein the method of manufacturing sintered haydite from gold mine tailings and neutralized slag comprises the steps of: The step S3 comprises the following process: the wet green balls prepared in step S2 are transferred to a drying device, dried and dewatered at a drying temperature of 105±5℃ for 4-8h, and the dried material balls are ensured to naturally fall without breaking within a range of 1-2m from the ground, to obtain the dry green balls.

7. The method as claimed in claim 1, wherein the gold mine tailings and neutralized slag sintered haydite is prepared by the steps of: The step S4 comprises the following process: the dry green balls obtained in step S3 are placed in a rotary furnace, the temperature in the furnace is controlled to rise from room temperature at a rate of 5-20℃ / min to 400-500℃ for preheating for 10-20min; after preheating, the temperature in the furnace is controlled to rise to a calcining temperature of 800-850℃ at a rate of 5-40℃ / min, and the temperature is maintained for 10-30min; then the temperature in the furnace is controlled to rise to a calcining temperature of 1000-1200℃ at a rate of 5-40℃ / min, and the temperature is maintained for 20-60min to obtain calcined ceramic granules; After calcination, the ceramic granules are naturally cooled in the convection air to obtain sintered ceramic granules.

8. A sintered haydite of gold tailings and neutralized slag, characterized by: The ceramicite is prepared by using gold tailings and neutralized slag of acid mine drainage treatment as raw materials and the preparation method of the gold tailings and the neutralized slag sintered ceramicite in any one of claims 1-7.

Images