Method for synergistically disposing and recycling industrial miscellaneous salt with steel slag

Abstract

The present application belongs to the field of solid waste treatment and comprehensive utilization, and particularly relates to a method for cooperatively disposing and resourcefully utilizing industrial miscellaneous salt by steel slag. In the method, the industrial miscellaneous salt is mixed with molten steel slag for cooperative resourceful treatment, and the treated steel slag still belongs to general industrial solid waste and still maintains its building material raw material property. Preferably, in the method, molten steel slag generated in the process of steelmaking is mixed with industrial miscellaneous salt for reaction, so that the industrial miscellaneous salt is resourcefully utilized, and the treated steel slag still belongs to general industrial solid waste and still maintains its building material raw material property.

Description

Technical Field

[0001] This invention belongs to the field of comprehensive utilization of solid waste treatment, and relates to a method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag. Background Technology

[0002] Currently, under the requirements of water conservation and emission reduction, wastewater treatment processes in industries such as steel, coal chemical, and coal mining in the Yellow River Basin are continuously being optimized. Many enterprises have also successively built "reverse osmosis" and "zero discharge" devices to ensure that the treated water meets increasingly stringent emission standards and even relevant water use standards. However, the high-salt wastewater produced after membrane treatment, while yielding sodium chloride and sodium sulfate through evaporation and crystallization, also generates a large amount of mixed salts. The main components of these mixed salts are sodium chloride and sodium sulfate, along with some impurity ions. Currently, these mixed salts are managed as hazardous waste, primarily through landfill, which presents problems such as high disposal costs, the occupation of large amounts of land resources, and potential pollution of groundwater and soil, failing to achieve the true requirements of "reduction, resource recovery, and harmlessness" in disposal.

[0003] Patent CN110877900 B discloses a method and system for the resource utilization of mixed salts. The method includes: 1) dissolving the mixed salts, 2) separating them using bipolar membrane electrodialysis, 3) acid treatment, and 4) electrodialysis concentration. The system includes a dissolving tank, a recycled water tank, a bipolar membrane electrodialysis separation system, and an electrodialysis concentration system. The bipolar membrane electrodialysis separation system separates and collects salt ions from the mixed salt solution, ultimately obtaining at least one of a high-purity monovalent acid, a monovalent mixed acid, and sulfuric acid, as well as liquid alkali. The obtained high-purity liquid alkali, sulfuric acid, and monovalent acid are concentrated for internal use or sale, and the recycled water obtained from the concentration is reused in the system. However, this method requires further dissolution and electrodialysis of the mixed salts, resulting in a relatively long process and high energy consumption.

[0004] Patent CN202210403652.4 discloses a method for the resource utilization of industrial waste salts, including the following steps: S1: calcination, where industrial waste salts are placed in a calcination furnace for calcination, and the exhaust gas from calcination is then completely incinerated in a regenerative thermal oxidizer; S2: filtration, where the calcined salts are dissolved in water to prepare a saturated solution, which is then separated into solid and liquid components by a filter, and residual organic matter is removed from the solution using synergistic photocatalytic oxidation to obtain a sodium chloride solution with the organic matter removed. The residue obtained from filtration is then solidified; S3: refining, where the obtained sodium chloride solution with the organic matter removed is subjected to sulfate removal and calcium ion removal treatment sequentially. This method requires high-temperature calcination of the waste salts, followed by dissolution to prepare a saturated solution and then separation. The entire process consumes a large amount of energy and produces Ca and Mg slag, which requires further treatment.

[0005] Patent CN201611042295.4 discloses a method for resource recovery of miscellaneous salts produced during industrial wastewater treatment, comprising: (1) calcining the miscellaneous salts produced during industrial wastewater treatment, cooling them, and dissolving them in pure water to obtain a high-concentration sodium chloride solution; (2) performing solid-liquid separation and removing residual organic matter from the solution; (3) sequentially removing sulfate and calcium ions, and adjusting the pH of the solution to neutral to obtain a high-purity sodium chloride solution; (4) crystallizing the high-purity sodium chloride solution obtained in step (3) to obtain sodium chloride crystals, and washing them to obtain high-purity sodium chloride crystals. This method does not recover the sodium sulfate content, which is relatively high in the miscellaneous salts, and the recovered sodium chloride crystals have relatively low economic value and poor market viability. The entire process requires calcination, dissolution, and separation, resulting in high energy consumption.

[0006] Currently, steel slag is an industrial byproduct of steelmaking. Its main components are oxides formed from the oxidation of elements such as calcium, magnesium, iron, silicon, aluminum, sodium, and manganese in the metal furnace charge. Its primary uses are cement production and road paving. While the steel slag production process is short and molten steel slag has high calorific value, there is currently no method to utilize the steel slag production process to dispose of impurities and salts. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the main objective of this invention is to provide a method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag. This method aims to solve the problem of large quantities of miscellaneous salts generated in the Yellow River Basin that are difficult to utilize, and to achieve the harmless treatment and resource utilization of these salts. Furthermore, the promotion and application of this technology will bring significant economic, environmental, and social benefits.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A method for the co-processing and resource utilization of industrial miscellaneous salts in steel slag involves mixing industrial miscellaneous salts with molten steel slag for co-processing and resource utilization.

[0010] The steel slag treated by the method of this invention is still classified as general industrial solid waste and retains its properties as a building material raw material.

[0011] In this invention, the industrial miscellaneous salt is miscellaneous salt produced during the production process of coal chemical enterprises, and / or miscellaneous salt produced from wastewater treatment in steel and coal mining enterprises. Further, the main components of the industrial miscellaneous salt are sodium chloride and sodium sulfate, and further, the mass percentages of sodium chloride and sodium sulfate are 20%–40% and 30%–60%, respectively.

[0012] Furthermore, the composition of the steel slag includes, by mass percentage: CaO: 35%–60%, SiO2: 10%–20%, Al2O3: 1%–8%, MgO: 5%–10%, TFe: 15%–20%, P2O5: 2%–5%.

[0013] Furthermore, the mass ratio of the industrial miscellaneous salt to steel slag is (1-5):100.

[0014] Furthermore, the melting temperature is 1200–1400°C.

[0015] Furthermore, the time for the collaborative resource processing is 30–120 minutes.

[0016] Furthermore, the gas generated by the synergistic resource recovery process is further processed, and the main component of the gas is sulfur dioxide.

[0017] Furthermore, the molten steel slag is molten steel slag produced during the steelmaking process.

[0018] Furthermore, the molten steel slag is steel slag that has been crushed and then heated to melt.

[0019] Furthermore, the steel slag after collaborative resource recovery is cooled in the furnace or in water.

[0020] Compared with existing technologies, it has the following beneficial effects:

[0021] This invention utilizes the heat of molten steel slag to resourcefully utilize and harmlessly treat industrial miscellaneous salts. While ensuring production safety, it significantly saves energy, effectively reduces greenhouse gas emissions, and provides an effective solution to the problem of difficult-to-treat and utilize miscellaneous salts. Furthermore, after co-processing, the steel slag undergoes hazardous waste identification and is found to lack hazardous waste characteristics, thus classifying it as general industrial solid waste. It does not have any other environmental impact, does not add extra processing burden, and can significantly reduce miscellaneous salt disposal costs. Simultaneously, the treated steel slag retains its building material raw material properties and does not change its original use, therefore possessing significant economic, environmental, and social benefits. Specifically:

[0022] (1) This invention, through the synergistic treatment of industrial miscellaneous salts and steel slag, not only effectively utilizes the excess heat in the molten steel slag, which helps to save energy and reduce emissions, but also effectively solves the problem of difficult-to-treat industrial miscellaneous salts;

[0023] (2) This invention can be based on the molten steel slag generated during the steelmaking process. All the heat in the entire process comes from the calorific value of the molten steel slag itself, without the need for additional heating, which greatly reduces energy consumption loss and waste. Compared with conventional hazardous waste disposal, it can better achieve the purpose of pollution reduction and carbon reduction.

[0024] (3) This invention will, without changing the existing steel slag process and without affecting the use of steel slag, use steel slag, an industrial solid waste, to treat industrial miscellaneous salt hazardous waste, so that the hazardous waste is transformed into general industrial solid waste, thereby achieving the synergistic treatment of industrial miscellaneous salt and steel slag.

[0025] (4) Based on the amount of miscellaneous salt produced by Baogang (Group) Company and the market price of miscellaneous salt disposal, it is estimated that the miscellaneous salt disposal cost can be reduced by about RMB 10 million per year. At the same time, considering that the annual output of steel slag is 2 million tons, combined with the miscellaneous salt ratio of this method and the demand for miscellaneous salt disposal in the region, it is expected that the revenue can be increased by RMB 60 million per year. Attached Figure Description

[0026] Figure 1 This is a process flow diagram of Embodiment 2 of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. The embodiments of this invention are implemented based on the technical solutions of this invention, and detailed implementation methods and processes are given. However, the scope of protection of this invention is not limited to the following embodiments. Those skilled in the art should understand that the embodiments are merely helpful in understanding this invention and should not be considered as specific limitations on this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0028] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0029] In this invention, unless otherwise specified and / or stated, all numerical values ​​relating to component amounts are "by weight or weight percentage" throughout. Process parameters in the following examples that do not specify particular conditions are generally performed under conventional conditions.

[0030] A method for the co-processing and resource utilization of industrial miscellaneous salts in steel slag involves mixing industrial miscellaneous salts with molten steel slag for co-processing and resource utilization.

[0031] This invention utilizes the heat of molten steel slag to resourcefully utilize and harmlessly treat industrial miscellaneous salts. While ensuring production safety, it significantly saves energy, effectively reduces greenhouse gas emissions, and provides an effective solution to the problem of difficult-to-treat and utilize miscellaneous salts. Furthermore, after co-processing, the steel slag undergoes hazardous waste identification and is found to lack hazardous waste characteristics, thus classifying it as general industrial solid waste. It does not have any other environmental impact, does not add extra treatment burden, and can significantly reduce miscellaneous salt disposal costs. Simultaneously, the treated steel slag retains its building material raw material properties and does not change its original use, therefore possessing significant economic, environmental, and social benefits. Optional applications of the treated steel slag include, but are not limited to, cement production and road paving.

[0032] As an optional embodiment of the method of the present invention, the steel slag comprises the following components by mass percentage: CaO: 35%–60%, SiO2: 10%–20%, Al2O3: 1%–8%, MgO: 5%–10%, TFe: 15%–20%, P2O5: 2%–5%.

[0033] This invention utilizes the residual heat and original components of molten steel slag, achieving true synergistic resource utilization without increasing energy consumption or reducing the use of additives. The resulting mixed product retains its original building material properties and does not affect subsequent comprehensive utilization. As an optional embodiment of the steel slag composition, CaO can typically, but not limited to, be selected from 37%, 39%, 41%, 43%, 45%, 47%, 49%, 51%, 53%, 55%, 57%, and 59%; SiO2 can typically, but not limited to, be selected from 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, and 19%; Al2O3 can typically, but not limited to, be selected from 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, and 7.5%; MgO can typically, but not limited to, be selected from 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, and 7.5%; and MgO can typically, but not limited to, be selected from 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, and 7.5%. The content of iron (TFe) is typically, but not limited to, selected from 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, and 9.5%; the total iron content (TFe mainly exists in slag as FeO, Fe3O4, and Fe2O3) is typically, but not limited to, selected from 15.5%, 16%, 16.5%, 17%, 17.5%, 18%, 18.5%, 19%, and 19.5%; and the content of phosphorus (P2O5) is typically, but not limited to, selected from 2.1%, 2.4%, 2.7%, 3%, 3.3%, 3.7%, 4%, 4.3%, 4.7%, and 4.9%.

[0034] As an optional embodiment of the method of the present invention, the industrial miscellaneous salt is miscellaneous salt generated during the production process of coal chemical enterprises, and / or miscellaneous salt generated from the wastewater treatment of steel and coal mining enterprises.

[0035] In this invention, the main components of the industrial miscellaneous salt are sodium chloride and sodium sulfate, and further, the sodium chloride and sodium sulfate account for 20%–40% and 30%–60% of the total mass, respectively. Although the industrial miscellaneous salt is mainly composed of sodium chloride and sodium sulfate, it also contains some impurity ions such as Mg. 2+ Ca 2+ K + Heavy metal ions, Fe 3+ F - NO3 - Wastewater typically contains a variety of organic compounds. Salt treatment usually involves landfilling or dumping, but due to the high solubility and poor stability and solidification of mixed salts, improper handling can easily cause secondary environmental pollution, classifying them as hazardous waste. The salt compounds in industrial mixed salts contain foul, pungent odors, and the heavy metals and chlorides they contain can pollute soil and groundwater, harming environmental health; they can also harm human health, such as causing organ damage and respiratory diseases due to excessive chlorides. However, the method of this invention utilizes the residual heat of molten steel slag and its original components to decompose some substances in the mixed salts, such as organic matter or other harmful substances, at high temperatures. After decomposition, some volatilize, while the remaining substances in the mixed salts remelt and crystallize with the steel slag at high temperatures and / or react to form glassy silicate substances. Therefore, the non-volatile components in the mixed salts are well and stably solidified in the steel slag, making them less prone to leaching.

[0036] As an optional embodiment of the method of the present invention, the mass ratio of industrial miscellaneous salt to steel slag is (1-5):100 (e.g., 1:100, 1.5:100, 2:100, 2.5:100, 3:100, 3.5:100, 4:100, 4.5:100, 5:100). Controlling the mass ratio of industrial miscellaneous salt to steel slag within this range not only conforms to the actual output of both during the steel enterprise's production process, but also has a good effect on the treatment of industrial miscellaneous salt.

[0037] As an optional embodiment of the method of the present invention, the melting temperature is 1200-1400℃ (e.g., 1210℃, 1230℃, 1250℃, 1270℃, 1290℃, 1310℃, 1330℃, 1350℃, 1370℃, 1390℃).

[0038] As an optional embodiment of the method of the present invention, the time for the collaborative resource processing is 30 to 120 minutes (e.g., 40 minutes, 50 minutes, 60 minutes, 70 minutes, 80 minutes, 90 minutes, 100 minutes, 110 minutes).

[0039] As an optional embodiment of the method of the present invention, the gas generated by the synergistic resource recovery process is further processed, wherein the main component of the gas is sulfur dioxide.

[0040] In the above technical solution, the gas generated during the co-processing of resources is first detected and measured to determine its composition before specific treatment is carried out to meet the emission standards. The gas was found to be mainly composed of sulfur dioxide, which can be treated using existing conventional technologies, such as discharging it into water or ammonia water.

[0041] As an optional embodiment of the method of the present invention, the molten steel slag is molten steel slag produced during the steelmaking process.

[0042] As an optional embodiment of the method of the present invention, the molten steel slag is steel slag that has been crushed and then heated and melted.

[0043] In the method of this invention, when the molten steel slag is steel slag that has been crushed and then heated to melt, the method for co-processing and resource utilization of industrial miscellaneous salts from the steel slag specifically includes the following steps:

[0044] (1) The steel slag is crushed and mixed with different mass ratios of miscellaneous salts to obtain a mixed sample;

[0045] (2) The mixed sample is heated to the melting temperature at a constant rate to melt it. After a certain period of time, the molten slag sample is cooled with the furnace, and the generated gas is collected and disposed of to obtain the treated steel slag.

[0046] The above methods can be implemented using existing technology devices / equipment. For example, the crushing can be carried out using a jaw crusher, the mixing can be carried out using a stirrer, and the melting can be carried out in a high-purity magnesium oxide crucible in a tube furnace. Optionally, the mixed sample can be prepared in two other ways: first, steel slag is melted and then mixed salts are added for natural cooling; second, steel slag is melted and then mixed salts are added for isothermal melting in a tube furnace. The reaction temperatures differ between these two methods. In one method, the mixed salts are added after the steel slag has been melted to a specified temperature, and the reaction proceeds naturally, with the temperature decreasing over time. In the other method, the mixed salts are added after the steel slag has been melted to a specified temperature, and the reaction proceeds at a constant temperature, maintaining a constant reaction temperature.

[0047] As an optional embodiment of the method of the present invention, the steel slag after co-resource treatment is cooled in the furnace or in water. For steel slag cooled in the furnace, the slag sample needs to be cut and separated from the crucible to obtain a slag sample; while for steel slag cooled in water, the molten slag sample needs to be placed in water to cool, resulting in water-quenched slag.

[0048] The present invention will now be described in further detail with reference to specific embodiments.

[0049] Example 1

[0050] A method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag, comprising the following specific steps:

[0051] The mixed salts generated from Baotou Steel's wastewater treatment and the high-temperature molten steel slag generated during the steelmaking process were placed separately into high-purity magnesium oxide crucibles. The mixed salts accounted for 1% of the molten steel slag. The main components of the mixed salts were sodium chloride and sodium sulfate, with sodium chloride and sodium sulfate accounting for 30% and 45% of the mass, respectively. They also contained some impurity ions such as Mg. 2+ Ca 2+ K + Heavy metal ions, Fe 3+ F-, NO3 - The wastewater contained residual organic matter, etc.; the composition of the steel slag is shown in Table 1, and the temperature was 1200℃; the time for the combined resource utilization treatment of the two was 120 min. The main component of the gas generated and treated by the high-temperature molten slag sample was sulfur dioxide. After the molten slag sample cooled to room temperature, hazardous waste identification and composition testing were carried out on the slag sample. The composition testing was conducted using X-ray fluorescence spectrometry; the hazardous waste identification was carried out according to the standard "Identification Standard for Hazardous Waste: Leaching Toxicity Identification" (GB5085.3-2007) to identify the leaching toxicity of the ground sample. The specific contents of the main components of the steel slag before and after treatment are shown in Table 1. It can be seen that its basic properties did not change significantly after treatment, that is, it did not have a major impact on its subsequent comprehensive utilization pathways and can still be used in industries such as building materials; and the treated steel slag does not have the characteristics of hazardous waste. The leaching toxicity of the treated steel slag is shown in Appendix Table 2.

[0052] Table 1. Main components of steel slag before and after treatment in Example 1

[0053] steel slag before disposal 42.83％ 12.53％ 6.05％ 9.47％ 17.87％ 2.81％ Steel slag after treatment 42.39％ 9.34％ 6.00％ 9.45％ 15.60％ 0.648％

[0054] Table 2. Results of Leaching Toxicity Tests of Steel Slag After Treatment (Unit: mg / L)

[0055] copper ～ ～ ～ 100 no Zinc 0.008 0.010 ～ 100 no cadmium ～ ～ ～ 1 no lead ～ 0.15 0.17 5 no chromium ～ ～ ～ 15 no Hexavalent chromium 0.014 ～ 0.005 5 no mercury 0.00263 ～ ～ 0.1 no nickel ～ ～ ～ 5 no silver ～ ～ ～ 5 no arsenic 0.00531 ～ ～ 5 no selenium 0.04056 0.00519 ～ 1 no Fluorides 4.43 0.889 0.315 100 no

[0056] Note: "~" indicates that it was not detected.

[0057] Example 2

[0058] A method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag, the process is as follows: Figure 1 As shown, the specific steps are as follows:

[0059] Steel slag is crushed and ground into steel slag powder in a jaw crusher. The steel slag powder and miscellaneous salts (derived from wastewater treatment at Baotou Steel) are then mixed in a mixer to obtain a mixed sample. The miscellaneous salts account for 3% of the steel slag powder by mass. The main components of the miscellaneous salts are sodium chloride and sodium sulfate, with sodium chloride and sodium sulfate accounting for 30% and 45% by mass, respectively. The sample also contains some impurity ions such as Mg. 2+ Ca 2+ K + Heavy metal ions, Fe 3+ F - NO3 - The wastewater contained residual organic matter, etc.; the composition of the steel slag is shown in Table 3. The mixed sample was placed in a high-purity magnesium oxide crucible and then placed in a tube furnace. The temperature was uniformly raised to 1300℃ and kept constant for 60 minutes to generate a high-temperature molten slag sample. The main component of the gas generated and treated was sulfur dioxide. After the molten slag sample cooled to room temperature, hazardous waste identification and composition testing were performed on the slag sample. The composition testing was conducted using X-ray fluorescence spectrometry; the hazardous waste identification was performed according to the standard "Identification Standard for Hazardous Waste: Leaching Toxicity Identification" (GB5085.3-2007) to determine the leaching toxicity of the ground sample. The specific contents of the main components of the steel slag before and after treatment are shown in Table 3. It can be seen that its basic properties did not change significantly after treatment, meaning it did not have a major impact on its subsequent comprehensive utilization pathways and can still be used in industries such as building materials; moreover, the treated steel slag does not exhibit the characteristics of hazardous waste. The leaching toxicity of the treated steel slag is shown in Appendix Table 2.

[0060] Table 3. Main components of steel slag before and after treatment in Example 2.

[0061] steel slag before disposal 42.83％ 12.53％ 6.05％ 9.47％ 17.87％ 2.81％ Steel slag after treatment 37.00％ 7.67％ 8.60％ 6.47％ 21.20％ 0.639％

[0062] Example 3

[0063] A method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag, comprising the following specific steps:

[0064] Steel slag (its composition is shown in Table 4) was loaded into a high-purity magnesium oxide crucible and placed in a tube furnace. The temperature was raised to 1400℃ at a uniform rate and kept constant for 30 minutes to generate a high-temperature molten slag sample. 5% (by weight of steel slag powder) of miscellaneous salts (derived from wastewater treatment at Baotou Steel, mainly composed of sodium chloride and sodium sulfate, accounting for 30% and 45% respectively, and also containing some impurity ions such as Mg) was added. 2+ Ca 2+ K + Heavy metal ions, Fe 3+ F - NO3 -The slag (including residual organic matter in the wastewater, etc.) was then melted at a constant temperature in a tubular furnace for 30 minutes. After the molten slag sample cooled to room temperature, hazardous waste identification and composition testing were carried out on the slag sample. The composition testing was performed using X-ray fluorescence spectrometry. The hazardous waste identification was performed according to the standard "Identification Standard for Hazardous Waste - Leaching Toxicity Identification" (GB5085.3-2007) to determine the leaching toxicity of the ground sample. The contents of the main components of the steel slag before and after treatment are shown in Table 4. It can be seen that its basic properties did not change significantly after treatment, that is, it did not have a major impact on its subsequent comprehensive utilization pathways and can still be used in industries such as building materials. Moreover, the treated steel slag does not have the characteristics of hazardous waste. The leaching toxicity of the treated steel slag is shown in Appendix Table 2.

[0065] Table 4. Main components of steel slag before and after treatment in Example 3.

[0066] steel slag before disposal 42.83％ 12.53％ 6.05％ 9.47％ 17.87％ 2.81％ Steel slag after treatment 40.42％ 9.11％ 5.40％ 7.53％ 20.70％ 0.640％

[0067] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the scope of protection of the claims of the present invention.

Claims

1. A method for the co-processing and resource utilization of industrial miscellaneous salts from steel slag, characterized in that, Industrial miscellaneous salts are mixed with molten steel slag for synergistic resource recovery. The industrial miscellaneous salts are miscellaneous salts generated during the production process of coal chemical enterprises, and / or miscellaneous salts generated during the wastewater treatment of iron and steel and coal mining enterprises; the molten steel slag is molten steel slag generated during the steelmaking process; the steel slag after co-resource recovery treatment is cooled with the furnace or cooled in water; Furthermore, the steel slag after co-processing does not have the characteristics of hazardous waste and retains its properties as a building material raw material; The steel slag composition includes, by mass percentage: CaO: 35%~60%, SiO2: 10%~20%, Al2O3: 1%~8%, MgO: 5%~10%, TFe: 15%~20%, P2O5: 2%~5%; The mass ratio of the industrial miscellaneous salt to the steel slag is (1~5):100; The melting temperature is 1200~1400℃; The time for the collaborative resource processing is 30~120 minutes.

2. The method for co-processing and resource utilization of industrial miscellaneous salts with steel slag as described in claim 1, characterized in that, The gas generated by the aforementioned collaborative resource recovery process is then processed.

3. The method for co-processing and resource utilization of industrial miscellaneous salts with steel slag as described in claim 2, characterized in that, The main component of the gas is sulfur dioxide.

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