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CN-121992158-A - Method for removing sulfur in iron-containing material by dynamic cold quenching method, low-sulfur iron product and application thereof

CN121992158ACN 121992158 ACN121992158 ACN 121992158ACN-121992158-A

Abstract

The invention discloses a method for removing sulfur in an iron-containing material by a dynamic cold quenching method, a low-sulfur iron product and application thereof, and relates to the technical field of preparation of high-purity iron products. The method comprises the steps of placing iron-containing materials in a high-temperature container, introducing oxygen into the high-temperature container, stirring uniformly, carrying out high-temperature oxygenation roasting on the iron-containing materials, spraying a cooling medium on the surfaces of the iron-containing materials in the high-temperature oxygenation roasting process, cooling the iron-containing materials by the cooling medium, annealing and cooling after the high-temperature oxygenation roasting is finished, and washing, solid-liquid separating and drying the obtained high-temperature oxygenation roasting products to obtain low-sulfur iron products. According to the method, a cooling medium is sprayed to the surface of the iron-containing material in the high-temperature oxygenation roasting process, so that microcracks are generated on the iron-containing material, sulfur impurities originally existing in lattice gaps and/or particle pores are exposed, and then the sulfur impurities are burnt through high-temperature oxygenation, so that deep desulfurization can be realized.

Inventors

  • LIU XIAOHUI
  • TIAN XIAOXUE
  • WANG YANG

Assignees

  • 四川辉伟融达科技有限责任公司

Dates

Publication Date
20260508
Application Date
20260212

Claims (10)

  1. 1. A method for removing sulfur in iron-containing materials by a dynamic cold quenching method is characterized by comprising the following steps: Placing an iron-containing material in a high-temperature container, introducing oxygen into the high-temperature container, uniformly stirring, carrying out high-temperature oxygenation roasting on the iron-containing material, and spraying a cooling medium on the surface of the iron-containing material in the high-temperature oxygenation roasting process, wherein the cooling medium is used for carrying out cold quenching on the iron-containing material; annealing and cooling after the high-temperature oxygenation roasting is finished; washing the obtained high-temperature oxygenated roasting product, carrying out solid-liquid separation and drying to obtain a low-sulfur iron product.
  2. 2. The method for removing sulfur in the iron-containing material by using the dynamic cold quenching method according to claim 1, wherein the cooling medium is water or sodium hydroxide, potassium hydroxide or ammonia water, and the mass concentration of the sodium hydroxide, the potassium hydroxide or the ammonia water is 1-5%; And/or spraying the cooling medium in an amount of 1-3 mL of cooling medium per 100g of iron-containing material; And/or spraying a cooling medium to the surface of the iron-containing material in a stirring state, or spraying a cooling medium to the surface of the iron-containing material in a non-stirring state, and stirring the iron-containing material after the spraying of the cooling medium is finished for 2-15 s.
  3. 3. The method for removing sulfur in the iron-containing material by using the dynamic cold quenching method according to claim 2, wherein the high-temperature oxygenation roasting time of the iron-containing material is 90-180 min; And/or when oxygen is introduced into the high-temperature container, the gas-solid ratio of the oxygen to the iron-containing material is 1-2L/min to 100g; and/or spraying cooling medium on the surface of the iron-containing material for 3-5 min.
  4. 4. The method for removing sulfur from iron-containing materials by dynamic quenching according to claim 2, wherein the iron-containing materials are placed in a high temperature vessel by: After placing the iron-containing material in the high-temperature container, heating the iron-containing material and the high-temperature container to above 600 ℃ simultaneously; Or after the high-temperature container is heated to above 600 ℃, the iron-containing material is placed in the high-temperature container.
  5. 5. The method for removing sulfur from iron-containing material according to any one of claims 1 to 4, wherein the iron-containing material is one or more of ferrous oxide, ferric oxide, ferrous sulfate, ferric sulfate, ferrous hydroxide, ferric hydroxide, and ferric hydroxide.
  6. 6. The method for removing sulfur from iron-containing materials by a dynamic cold quenching method according to any one of claims 1 to 4, wherein the product obtained by cold quenching at low temperature is placed in warm water, and after being stirred uniformly for washing, the washed product is subjected to solid-liquid separation; And drying the solid material subjected to solid-liquid separation.
  7. 7. The method for removing sulfur in iron-containing materials by using a dynamic cold quenching method according to any one of claims 1 to 4, wherein the product obtained by cold quenching at low temperature is placed in dilute nitric acid, dilute hydrochloric acid or hydrogen peroxide, and is stirred uniformly, and after primary washing, the primary washed product is subjected to solid-liquid separation; Placing the solid material after solid-liquid separation in warm water again, stirring uniformly, washing for the second time, and carrying out solid-liquid separation on the product of the second washing; And drying the solid material subjected to solid-liquid separation.
  8. 8. The method for removing sulfur from iron-containing materials by a dynamic cold quenching method according to claim 6 or 7, wherein the temperature of warm water is 50-70 ℃, and the washing time of the warm water is 10-15 min; And/or the mass concentration of the dilute nitric acid and the dilute hydrochloric acid is 2-5%, and the washing time of the dilute nitric acid, the dilute hydrochloric acid or the hydrogen peroxide is 5-15 min; and/or placing the filtered solid material into a drying furnace, and drying for 30-60 min at 100-200 ℃.
  9. 9. A low-sulfur iron product obtainable by the process for removing sulfur from an iron-containing material according to any one of claims 1 to 8, characterized in that the sulfur content in the low-sulfur iron product is less than 50ppm.
  10. 10. Use of a method according to any one of claims 1 to 8 for removing sulphur from iron-containing material by dynamic cold quenching, characterized in that the method is applied in the field of catalysis, in the field of metallurgy and/or in the field of magnetic materials for removing non-metallic and/or metallic impurities from iron-containing material.

Description

Method for removing sulfur in iron-containing material by dynamic cold quenching method, low-sulfur iron product and application thereof Technical Field The invention relates to the technical field of high-purity iron product preparation, in particular to a method for removing sulfur in iron-containing materials by a dynamic cold quenching method, a low-sulfur iron product and application thereof. Background The solid waste such as titanium white powder slag, steel waste slag, battery black powder and copper smelting slag contains a large amount of iron elements, iron-containing waste is used as a raw material, iron is recovered, iron-series products (such as ferric oxide, ferroferric oxide, iron powder and the like) are prepared, the method is an important way for realizing resource recycling and environmental protection treatment, and the prepared iron-series products are widely applied to the fields of catalysis, metallurgy, magnetic materials and the like, and the purity of the iron-series products directly determines the performance and application safety of downstream products. In the process for preparing the ferric oxide by recycling the iron from the solid waste, the solid waste is often accompanied by transition metal impurities such as nickel, cobalt, manganese and the like, and nonmetal impurities such as carbon, sulfur, phosphorus and the like besides iron elements. When the iron-based product is prepared, metal impurities can be removed by processes such as pH adjustment, solid-liquid separation, washing and the like. However, for non-metallic impurities, it is difficult to remove by wet processes. Taking the preparation of high-purity iron powder as an example, the residual sulfur element exists in the form of iron sulfides such as FeS, and the existence of the sulfides not only reduces the purity of the high-purity iron, but also can obviously degrade the high-purity iron powder in the aspects of mechanical property, processability, corrosion resistance and the like, and the total amount of impurities of the high-purity iron is extremely low, so that the 'micro degradation effect' of sulfur is more prominent than that of common industrial iron. Specifically, in the field of hot working, the existence of sulfur impurities is a root for influencing the hot brittleness of high-purity iron powder, sulfur and iron form low-melting FeS, and the low-melting FeS is easy to cause crystal boundary melting cracking during hot working, and in the field of catalysis, the existence of the sulfur impurities is easy to poison a catalyst and corrode materials. When preparing high-temperature processed products (such as high-density powder metallurgy structural parts, high-temperature alloy and the like), the content of sulfur in raw materials is required to be below 10ppm, and the content of sulfur in the raw materials is required to be 30-50ppm when preparing products such as chemical catalysts and the like used at normal temperature. At present, a high-temperature calcination process is adopted for desulfurization, and the sulfur element in the obtained iron powder still has 300-800 ppm, so that the requirements of the field are difficult to meet. Therefore, providing a method for removing sulfur element to meet the requirement of high-quality iron-based products is a technical problem to be solved by those skilled in the art. Disclosure of Invention The invention discloses a method for removing sulfur in an iron-containing material by a dynamic cold quenching method, a low-sulfur iron product and application thereof, and aims to solve the technical problem that the high-quality iron product requirement is difficult to meet by high-temperature calcination desulfurization in the related art. In order to solve the problems, the invention adopts the following technical scheme: In a first aspect, the invention provides a method for removing sulfur from iron-containing materials by a dynamic cold quenching method. The invention relates to a method for removing sulfur in iron-containing materials by a dynamic cold quenching method, which comprises the following steps: Placing an iron-containing material in a high-temperature container, introducing oxygen into the high-temperature container, uniformly stirring, carrying out high-temperature oxygenation roasting on the iron-containing material, and spraying a cooling medium on the surface of the iron-containing material in the high-temperature oxygenation roasting process, wherein the cooling medium is used for carrying out cold quenching on the iron-containing material; annealing and cooling after the high-temperature oxygenation roasting is finished; washing the obtained high-temperature oxygenated roasting product, carrying out solid-liquid separation and drying to obtain a low-sulfur iron product. According to an alternative embodiment, the cooling medium is water, or the cooling medium is sodium hydroxide, potassium hydroxide or ammonia water, and the mass co