Method for preliminary treatment of molten iron

Method for preliminary treatment of molten iron

  • CN 105,087,846 A
  • Filed: 01/17/2013
  • Published: 11/25/2015
  • Est. Priority Date: 01/19/2012
  • Status: Active Application
First Claim
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1. molten iron pretreatment method, in the method, when using converter type container to carry out desiliconization process and the dephosphorization treatment of molten iron, first, molten iron from blast furnace casting is loaded in converter type container and carries out desiliconization process, then, a part of carrying out the slag after making molten iron and desiliconization process remains in the middle deslagging process in this container, then, in the molten iron after the desiliconization remained in this container and slag, add lime flux and be blown into oxygen, carry out the dephosphorization treatment of molten iron, whereinMore than 30 quality % after making the dephosphorization treatment of basicity of slag more than 1.2 in slag remain in described converter type container,Then, in this container of slag after dephosphorization treatment is housed, at least load untreated molten iron carry out desiliconization process, make the silicon concentration of the molten iron at the end of this desiliconization process at below 0.2 quality %, after desiliconization process the basicity of slag more than 0.5, less than 1.5, molten iron temperature more than 1240 DEG C, less than 1400 DEG CThen, carry out more than the 40 quality % of slag after desiliconization process to be discharged to the middle deslagging outside stove,Afterwards, carry out dephosphorization treatment with same aforesaid receptacle,In desiliconization process, make basicity of slag more than 0.8, less than 1.5.

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