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Application of Steel Stranded Wire in the Iron and Steel Industry
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Application of Steel Stranded Wire in the Iron and Steel Industry

  • Categories:Company News
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  • Time of issue:2021-11-12 09:42
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(Summary description)Bulk materials can be compressed into compact blocks under high pressure. This kind of polymerization only relies on molecular attraction, but this kind of force

Application of Steel Stranded Wire in the Iron and Steel Industry

(Summary description)Bulk materials can be compressed into compact blocks under high pressure. This kind of polymerization only relies on molecular attraction, but this kind of force

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2021-11-12 09:42
  • Views:
Information

Bulk materials can be compressed into compact blocks under high pressure. This kind of polymerization only relies on molecular attraction, but this kind of force is more effective for materials that have plastic deformation. Because the gravitational force of spherical particles can be deformed into two-plane gravitational force under pressure, the attraction of molecules is greatly increased. The plastic deformation of iron ore powder is very small, so it is difficult to make a compact with a certain strength by relying solely on high pressure. Winniski once summarized a relationship between the density change rate of iron ore powder and pressure based on experimental data. After calculation, even if the pressure is increased to 100 MPa, the volume shrinkage rate does not exceed 10%, and the increase in briquette strength is limited. For this reason, several alternative methods have been used to produce briquettes.

  (1) First use a pressing machine to form the billet, and then subject the parison to high temperature firing. Squared ore is the product of this method. It has been developed in Europe and the United States in the 1920s, but it has not been promoted because of its high consumption and poor quality, which is not suitable for blast furnace production.

  (2) Add a binder to the iron ore powder and then press it.

  (3) The iron ore powder is heated to a certain temperature ((800-1050C), so that the ore powder has plasticity and then hot-pressed.

   The latter two methods have been tested in the United States and my country, but they were both unsuccessful due to high cost and poor effect. However, they can be applied to powder products in the production of pressed iron alloys and direct reduction production, especially the fine-grained sponge iron powder produced by the fluidization method is pressed into a block product, which is beneficial to transportation and can prevent the sponge iron powder from re-oxidation. . Usually, a roller press or a mould press is used to press in a cold or hot state, and sometimes a mixture of additives such as lime, water glass or slurries is added during the pressing to increase the compressive strength of the product.

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