Resource utilization method of steelmaking production synergistic antibiotic medicine residue

Abstract

The invention discloses a resource utilization method for synergic steelmaking production and antibiotic decoction dregs, which is characterized in that high-temperature liquid-state steel slag generated in a converter steelmaking production process is used for synergic treatment of the antibiotic decoction dregs, and alkaline minerals and high temperature of the converter steel slag are used for inactivation treatment of the antibiotic decoction dregs; reducing heavy metal compounds in the antibiotic medicine residues by using organic matters in the antibiotic medicine residues, so that the heavy metal compounds are molten into dispersed metal droplets in the converter steel slag, and harmless conversion of heavy metals in the antibiotic medicine residues is completed; f-CaO and tricalcium silicate in the converter steel slag react with arsenide in the antibiotic medicine residues to generate calcium arsenate, and harmless conversion of the arsenide in the antibiotic medicine residues is achieved.

Description

Technical Field

[0001] This invention relates to a method for the resource utilization of antibiotic residues produced in conjunction with steelmaking. Background Technology

[0002] Antibiotics are a type of bioactive substance, and their application has had a profound impact on human medical development. They are mainly used to treat various bacterial infections or diseases caused by pathogenic microorganisms. Antibiotic residue is a solid waste generated by microbial fermentation during the production of antibiotics in pharmaceutical companies. As a hazardous waste as defined by the state, it is characterized by its large quantity, high water content, high nitrogen and sulfur content, and the presence of residual antibiotics, posing a significant environmental hazard. my country is a major producer of antibiotics, with an annual output exceeding 200,000 tons, accounting for more than 70% of global production.

[0003] Antibiotic residue is a high-cost and difficult-to-resource-utilize material due to its high water content and various toxic substances. A review of literature (1) reveals that five authors, Chen Guanyi, Liu Huanbo, Li Jian, Yan Beibei, etc., published a paper entitled "Research Progress on Antibiotic Residue Treatment Technology" in the second issue of the journal *Environmental Chemistry* in 2021. The paper states: "Antibiotic residue is a solid waste produced by microbial fermentation during the production of antibiotic drugs by pharmaceutical companies. As a hazardous waste as defined by the state, its large output, high water content, high nitrogen and sulfur content, and residual antibiotics make it extremely environmentally hazardous. The scientific and harmless treatment of antibiotic residue is a hot and difficult problem in the field of pharmaceutical solid waste." This article systematically describes the types, properties, and hazards of antibiotic residue, and provides a detailed review of the current mainstream thermochemical and non-thermochemical treatment technologies. It focuses on the thermochemical treatment technologies, including incineration, hydrothermal, and pyrolysis gasification technologies, and summarizes and analyzes their technical characteristics, environmental impact, application bottlenecks, and research progress. (2) Gao Xinyue, Weng Junjie, Tang Guantao, Zhou Lei, and other seven authors published a paper entitled "Research Progress on Resource-based Disposal Technology of Antibiotic Residue" in the 6th issue of the 2021 issue of the journal "Coal and Chemical Industry". The paper states that "the state has now explicitly prohibited the production of antibiotic residue as feed, and composting technology will cause antibiotics to accumulate in plants and microorganisms, thus forming drug resistance." This could lead to potential ecological risks. Energy conversion technology for antibiotic residues is one of the effective ways to solve the problem of antibiotic residue disposal on a large scale. It is possible to consider co-combustion and co-gasification of antibiotic residues with other high-calorific-value fuels to solve the problem of efficient heat conversion caused by the low calorific value of the residues! Direct landfill disposal technology, although simple to operate and low in cost, occupies a large amount of land and poses a risk of groundwater pollution! Chemical degradation technology is complex to operate and costly, and generates a large amount of wastewater, which can easily cause secondary pollution to the environment, but its degradation effect is good and the time is short. Biodegradation technology, which uses microorganisms to degrade antibiotic residues, by modifying the metabolism of microorganisms and improving their enzyme activity, is one of the hot topics in future antibiotic residue research.

[0004] As can be seen from the literature review above, none of the literature mentions a process for co-processing antibiotic residues in steelmaking production. Summary of the Invention

[0005] The purpose of this invention is to provide a method for the resource utilization of antibiotic residue in steelmaking production. By using high-temperature steel slag from a converter to co-process antibiotic residue, the harmless transformation of antibiotic residue is achieved without affecting the steelmaking process, thus saving on the cost of hazardous waste treatment.

[0006] The objective of this invention is achieved by providing a method for the resource utilization of antibiotic residues produced in conjunction with steelmaking processes, implemented according to the following steps: S1. Transport the antibiotic residue to the high-pressure dry powder pelletizing machine production line for later use; S2. Purchase fly ash or gasification slag from coal chemical industry and transport it to the high-pressure dry powder pelletizing machine production line for later use. S3. Mix antibiotic residue and fly ash evenly in a mass percentage ratio of 50%:50%, and then use a dry powder pelletizing machine to produce pellets of 30-50mm. The chemical composition of the pellets is not required, and the moisture content is less than 15%. S4. Transport the above pellets to the converter production line for later use; S5. When the converter smelting is finished and the converter slag is poured out, the above pellets are added along with the liquid slag. The amount added per ton of slag is controlled at 50-150 kg. S6. After adding the above pellets, the converter slag treatment process remains unchanged.

[0007] The present invention has discovered the following scientific phenomena through research: 1. The main components of antibiotic residue are microbial mycelium and unutilized organic matter such as starch, soybean flour, and cottonseed protein, as well as small amounts of incompletely extracted antibiotics, ferrous sulfate, aluminum chloride, and calcium sulfate metabolites, and various additives used in the extraction process. Under the conditions of high-temperature alkaline steel slag, the microbial mycelium in antibiotic residue can be rapidly inactivated. The remaining organic matter can be utilized as a reducing agent in the high-temperature process environment of steelmaking, a feature particularly prominent in the converter steel slag treatment process. 2. In converter steel slag, there are 3% to 15% of small particles of molten iron. The heavy metal compounds in antibiotic residue can be reduced by reducing agent (organic matter containing C and H in antibiotics) into small particles of molten iron in the steel slag during the converter steel slag treatment process, thus realizing the harmless transformation of heavy metal elements in antibiotic residue. 3. Arsenic compounds in antibiotic residues can react with f-CaO and tricalcium silicate in high-temperature converter steel slag to generate calcium arsenate, thus completing the harmless transformation of arsenic compounds. 4. The sulfides and other components in antibiotic residues can undergo a secondary slag-forming reaction with converter steel slag under high-temperature conditions, transforming into components of converter steel slag, and can optimize the stability of converter steel slag resource utilization.

[0008] Based on the above research findings, the inventors used the following process to treat antibiotic residue.

[0009] 1. In view of the high moisture content of antibiotic residue, the inventors mixed fly ash and antibiotic residue in a mass percentage ratio of 50%:50% and then formed them into pellets to produce pellets that can be used in the steelmaking slag treatment process. 2. During the slag removal process of the converter, the above-mentioned pellets are added to the liquid steel slag. The amount of pellets added is 50-150 kg or more per ton of steel slag. The organic matter in the antibiotic residue is used to reduce the FeO in the converter steel slag and the heavy metal compounds in the antibiotic residue, thereby increasing the amount of metallic iron recovered from the steel slag. 3. In the above process, the steel slag used to treat antibiotic residues can react with Al2O3 and SiO2 in the pellets to reduce the f-CaO content in the converter steel slag, increase the performance of steel slag resource utilization, and facilitate the expansion of steel slag resource utilization pathways. It can be used in cement production (excluding general silicate cement), road construction, building materials production and other fields.

[0010] The innovative aspects of this invention are as follows: 1. The inventors discovered the advantages of high-temperature steel slag in the inactivation treatment of antibiotic residues and the principle of harmless transformation of heavy metals in antibiotic residues. The use of high-temperature converter steel slag in the slag treatment process to co-treat antibiotic residues is the first of its kind in the industry. 2. Utilizing the large amount of Al2O3 and SiO2 in fly ash that can undergo hydration reactions, it is mixed with antibiotic residue. The reaction between fly ash and the moisture in the antibiotic residue stabilizes the moisture in the antibiotic residue, and the antibiotic residue is processed into a raw material that can be recycled in the steel slag treatment process of steelmaking. 3. The secondary slag-forming reaction between high-temperature steel slag from the converter and antibiotic residue and fly ash is a typical reducing reaction. This process can convert the heavy metals in the antibiotic residue into dispersed metal droplets that melt into the steel slag, thus completing the harmless transformation of the heavy metals in the antibiotic residue. 4. Utilize the f-CaO and tricalcium silicate in the high-basicity steel slag of the converter to react with the arsenic compounds in the antibiotic residue, converting them into calcium arsenate, thereby achieving the harmless transformation of the arsenic compounds in the antibiotic residue. 5. The performance of converter steel slag was optimized by using antibiotic residues and fly ash, which improved the stability of converter steel slag resource utilization.

[0011] The beneficial contributions of this invention are as follows: Utilizing high-temperature converter steel slag for co-treatment of antibiotic residues achieves the harmless transformation of antibiotic residues without affecting the steelmaking process, saving on hazardous waste treatment costs, which is of great significance to social development; by using converter steelmaking slag treatment technology for co-treatment of antibiotic residues, 50-150 kg of antibiotic residues can be treated per ton of steel slag. Steelmaking enterprises can increase their economic income through hazardous waste treatment business, which is conducive to the green development of steel enterprises; China produces more than 80 million tons of converter steel slag annually, a huge output, which can easily solve the problem of resource utilization of antibiotic residues, and is of great significance to environmental protection. Detailed Implementation

[0012] The implementation of this invention is illustrated using a 150-ton converter production line as an example: A method for the resource utilization of antibiotic residue produced in conjunction with steelmaking processes is implemented according to the following steps: S1. Transport the antibiotic residue to the high-pressure dry powder pelletizing machine production line for later use; S2. Purchase fly ash or gasification slag from coal chemical industry and transport it to the high-pressure dry powder pelletizing machine production line for later use. S3. Mix antibiotic residue and fly ash evenly in a mass percentage ratio of 50%:50%, and then use a dry powder pelletizing machine to produce pellets of 30-50mm. The chemical composition of the pellets is not required, and the moisture content is less than 15%. S4. Transport the above pellets to the converter production line for later use; S5. When the converter smelting is finished and the converter slag is poured out, the above pellets are added along with the liquid slag. The amount added per ton of slag is controlled at 50-150 kg. S6. After adding the above pellets, the converter slag treatment process remains unchanged.

Claims

1. A method for the resource utilization of antibiotic residue in steelmaking production, characterized in that... Follow these steps: S1. Transport the antibiotic residue to the high-pressure dry powder pelletizing machine production line for later use; S2. Purchase fly ash or gasification slag from coal chemical industry and transport it to the high-pressure dry powder pelletizing machine production line for later use. S3. Mix antibiotic residue and fly ash evenly in a mass percentage ratio of 50%:50%, and then use a dry powder pelletizing machine to produce pellets of 30-50mm. The chemical composition of the pellets is not required, and the moisture content is less than 15%. S4. Transport the above pellets to the converter production line for later use; S5. When the converter smelting is finished and the converter slag is poured out, the above pellets are added along with the liquid slag. The amount added per ton of slag is controlled at 50-150 kg. S6. After adding the above pellets, the converter slag treatment process remains unchanged.