PRODUCTION OF IRON SULFIDE FROM SCALE, A STEEL PRODUCTION WASTE.

Abstract

The invention relates to a method for the production of iron sulfide (FexSy) that can be directly used in metallurgical or energy applications, where iron and steel industry slag waste is used directly as a raw material and the process is carried out using hydrometallurgical methods. The invention aims to recycle scale waste, which is generated in large quantities in the iron and steel industry and poses environmental risks. Furthermore, it aims to recover high-purity iron sulfide (FexSy), obtained using high-purity chemical raw materials and energy-intensive processes, for the first time by utilizing these wastes through hydrometallurgical methods. This not only ensures the disposal of environmentally harmful waste but also enables the development of low-cost and sustainable materials that can be used in advanced technology applications such as energy storage systems, photovoltaic, photocatalytic, magnetic, and spintronic devices.

Description

IRON SULFIDE FROM SCALE, A STEEL PRODUCTION WASTE. PRODUCTION Technical Area The invention involves using slag waste from the iron and steel industry as a direct raw material. metallurgical where used and the process is carried out by hydrometallurgical methods or iron sulfide that can be used directly in energy applications It is related to the production method of (FeS). xy Previous Technique In existing studies in the literature, iron sulfide compounds are generally identified as iron chloride. high-purity iron precursors such as iron nitrate or iron sulfate heptahydrate using; hydrothermal, sonochemical, microwave-assisted or high It is obtained through chemical synthesis methods at high temperatures. However, the methods used Precursor materials and applied synthesis methods are quite costly. are processes. titled Efficient Production of Ferrous Sulfate from Steel Mill Scale Waste The document describes the efficient production of iron sulfate from steel scale waste. In the document titled "Production of Ferrous Sulfate From Steelmaking Mill Scale," The production of iron sulfate from steel production slag is explained. The aforementioned documents indicate that iron sulfate (FeSO₄) production has been carried out, The basic reaction of the process is the reaction of iron oxides in the scale with sulfuric acid. It is based on dissolving the solution and obtaining the sulfate salt in the solution. This The product formed in the process is a water-soluble, oxidizable iron (II) sulfate. It is a compound and can be used directly in metallurgical or energy applications. It is not of that quality. When existing studies in the field are examined, it is seen that the scale waste of the iron and steel industry... where raw materials are used directly and the process is carried out using hydrometallurgical methods. 1 It can be used directly in the metallurgical or energy applications where it is implemented. The need to develop a method for producing high-quality iron sulfide (Fe₂S₃). xy It has been heard. Purposes of the Invention The aim of this invention is to process iron and steel industry slag waste directly as raw material. and the process is carried out using hydrometallurgical methods an iron that can be used directly in metallurgical or energy applications. It is the development of a sulfur (Fe₂S₃) production method. xy Another aim of this invention is to significantly reduce both raw material and energy costs. both the reduction of waste and the improvement of environmental sustainability through waste recycling The goal is to develop a method for producing iron sulfide (Fe₂S₃) that provides this. xy Another aim of this invention is to produce iron sulfide (Fe₂S₃) through a single-step chemical process. xy It is synthesized by precipitation, which makes it more suitable compared to other synthesis methods. low cost, simple equipment requirements and adaptability to industrial scale a highly feasible method for producing iron sulfide (Fe₂S₃) xy It is the development of. Detailed Description of the Invention The invention involves using slag waste directly as raw material and the process... iron sulfide (Fe₂S₃) production carried out by hydrometallurgical methods xy is related to the method, - Procurement of 1-1000 kg of slag waste, - The supplied slag waste is processed in a ball mill for 0.5-3 hours and at 100-500 rpm. Homogenization is achieved by grinding at high speed, - Sulfuric acid with a volume of 0.1-1000 L and a concentration of 0.5-6 M is added to slag waste. he Leaching processes in acid solutions at temperatures of 25-100°C for 0.1-24 hours. implementation, - Filtration of insoluble solids resulting from the leaching process. separation, 2 - Sulfurizing agents (Na₂S₃) are added to the leaching solutions at concentrations of 0.1-12 M. 2 Addition of HS, thioacetamide and thiourea), 2 he - The resulting solutions are stored at a pH range of 4-6 at a temperature of 15-120°C for 0.1-48 hours. Precipitation of iron sulfide (Fe₂S₃) by stirring for a period of time, xy - Separating the precipitated iron sulfide (Fe₂S₃) from the solution by filtration and xy he Drying at 105°C for 24 hours. It includes the steps. The method described in this invention is used to obtain iron sulfide (Fe₂S₃) from scale waste. xy This product contains sulfide anion (S²⁻) instead of sulfate ion (SO₄²⁻), and chemically... It is completely different and exhibits semiconductor and magnetic properties. It is a material. Therefore, both its synthesis mechanism and application area are important. It differs clearly from known techniques in this respect. The sulfur sources used within the scope of the invention are (Na₂S, H₂S, thioacetamide, thiourea). etc.) act as sulfurizing agents, scavenging Fe²⁺ ions in the solution. by enabling direct reaction with sulfur, iron sulfide phases It allows for controlled precipitation. Thus, only sulfuric acid Instead of sulfate formation observed in the systems used, high-purity water is used. Insoluble Fe₂S₃ compounds are obtained. Only sulfuric acid is used. xy This transformation is not possible in these systems, the product is iron sulfate. It remains. Therefore, thanks to the sulfurizing agents used in the invention: • Direct synthesis of sulfur-based materials is achieved from tufal, • The formation of soluble products associated with sulfate formation is prevented. • Hydrometallurgically, at low temperatures and in an environmentally friendly manner. High purity Fe₂S is obtained. xy Iron sulfide-based materials (Fe₂S₃) developed using the method described in this invention, xy when used alone or in combination with other techniques in industry, various commercial applications This enables the production of these products. These materials are steel and iron. as an additive in production or with hydrogen sulfide and other sulfur-based It has the potential to be used as a raw material source for chemical products. 3 Also in the field of energy storage, lithium-ion, sodium-ion and supercapacitors. It has the potential to be used as electrode material in systems and high-capacity, cyclically stable batteries and energy storage devices This makes its development possible. Nano-sized FeS₂ and Fe₃S₄ forms, on the other hand... potential for use in photovoltaic, photocatalytic, magnetic and spintronic devices by transporting solar energy converters, hydrogen production systems and high technology has led to the emergence of advanced commercial products such as electronic devices. This can provide both traditional industrial and advanced technology solutions. Thus, the invention is suitable for both traditional industrial and advanced technology sectors. a raw material that makes it possible to develop various commercial products in its fields and It offers production process solutions. 4

Claims

1. Hydrometallurgical systems where slag waste is used directly as raw material. It is a method of producing iron sulfide (FexSy), - Obtaining slag waste; - Grinding and homogenizing the supplied slag waste; - Leaching of homogenized slag waste with sulfuric acid solution. implementation; - The iron-containing leaching solution obtained as a result of the leaching process is filtered and solidified. separation from waste; - Adding a sulfurizing agent to the resulting leaching solution; - Precipitation of iron sulfide (Fe₂S₃); xy - Separation and drying of the precipitated iron sulfide (Fe₂S₃) by filtration. xy It is characterized by including its steps.

2. A method for producing iron sulfide (Fe₂S₃) as described in Claim 1, and the said xy The grinding process takes place in a ball mill for 0.5-3 hours at 100-500 rpm. It is characterized by being carried out at a high speed.

3. A method for producing iron sulfide (FexSy) as described in Claim 1, and the said leaching process with sulfuric acid solutions having a concentration of 0.5-6 M It is characterized by being carried out using [method / technique].

4. A method for producing iron sulfide (Fe₂S₃) as in Claim 1 or 3, and xy The subject is the leaching process at a temperature of 25-100°C and for a duration of 0.1-24 hours. It is characterized by its implementation.

5. A method for producing iron sulfide (Fe₂S₃) as described in Claim 1, and the said xy The sulfurizing agent belongs to the group containing Na2S, H2S, thioacetamide, and thiourea. It is characterized by its selection.

6. A method for producing iron sulfide (Fe₂S₃) as described in Claim 1, and the said xy by adding sulfurizing agents at a concentration of 0.1-12 M It is characterized by...

7. A method for producing iron sulfide (Fe₂S₃) as described in Claim 1, and the said xy Characterized by the precipitation process being carried out in the pH range of 4-6. is being done.

8. A method for producing iron sulfide (Fe₂S₃) as in Claim 1 or 7, and the statement xy The subject is the precipitation process at a temperature of 15-120°C and for a duration of 0.1-48 hours. It is characterized by being made by mixing.

9. A method for producing iron sulfide (Fe₂S₃) as described in Claim 1, and the said xy by carrying out the drying process at a temperature of 105°C for 24 hours It is characterized by... 6