US2007256516A1PendingUtilityA1

Steel making material recycling system

52
Individually held — no corporate assignee on recordPriority: Jul 20, 2001Filed: Nov 3, 2006Published: Nov 8, 2007
Est. expiryJul 20, 2021(expired)· nominal 20-yr term from priority
Inventors:Willard K. McclintockScott Kimmel
C21C 7/076C21B 3/04Y02W30/50C21C 5/54Y02P10/20C22B 7/02
52
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Claims

Abstract

A steel processing material comprises a dried post combustion material (PCM) and a slag foaming material.

Claims

exact text as granted — not AI-modified
1 - 7 . (canceled)  
   
   
       8 . A method of recycling exhaust waste material from an electric arc furnace comprising: 
 (a) recovering the exhaust waste material from an electric arc furnace;    (b) drying the exhaust waste material;    (c) adding scrap steel to the electric arc furnace; and    (d) adding the exhaust waste material to the electric arc furnace wherein iron from the exhaust waste material is recycled.    
   
   
       9 . The method of recycling the exhaust waste material of  claim 8  wherein drying is conducted in a screw auger dryer.  
   
   
       10 . The method of recycling the exhaust waste material of  claim 9  wherein the screw auger dryer comprises an induction heater.  
   
   
       11 . The method of recycling the exhaust waste material of  claim 9  further comprising sorting the PCM to obtain a fraction having an average particle size processable by the screw auger prior to drying.  
   
   
       12 . The method of recycling the exhaust waste material of  claim 11  wherein exhaust waste material is sorted to obtain a fraction having a particle size of about ¾ of an inch.  
   
   
       13 . The method of recycling the exhaust waste material of  claim 8  wherein the drying is conducted in a rotary dryer.  
   
   
       14 . The method of recycling the exhaust waste material of  claim 8  wherein drying the exhaust waste material comprises drying the exhaust waste material to not greater than about 2% water content.  
   
   
       15 . The method of recycling the exhaust waste material of  claim 8  wherein drying the exhaust waste material comprises air drying the exhaust waste material to about 6% to about 8% water content.  
   
   
       16 . The method of recycling the exhaust waste material of  claim 8  further comprising sorting the exhaust waste material to obtain a fraction having an average particle size processable by an injection gun.  
   
   
       17 . The method of recycling the exhaust waste material of  claim 16  wherein the exhaust waste material is sorted to obtain a fraction having a maximum particle size of about 5/16 of an inch.  
   
   
       18 . The method of recycling the exhaust waste material of  claim 8  further comprising conveying the dried exhaust waste material to a first container.  
   
   
       19 . The method of recycling the exhaust waste material of  claim 8  further comprising mixing the dried exhaust waste material with a slag foaming material.  
   
   
       20 . The method of recycling the exhaust waste material of  claim 19  wherein mixing is conducted by adding the dried exhaust waste material and concurrently adding slag foaming material into a container.  
   
   
       21 . A method of preparing a steel processing material comprising: 
 (a) recovering dry post combustion material (PCM) from a steel making process; and    (b) mixing the PCM with a slag foaming material.    
   
   
       22 . A method of manufacturing steel in an electric arc furnace comprising: 
 (a) melting in the electric arc furnace a first heat of steel comprising a liquid steel portion and a foamy slag portion;    (b) evacuating the emissions from the first ehat wherein solid waste material is exhausted from the heat;    mixing the solid waste material with a slag foaming material to form a steel processing material; and    (d) adding the steel processing material into a second heat of steel.    
   
   
       23 . The method of manufacturing steel of  claim 22  wherein the solid waste material is recovered from the first heat.  
   
   
       24 . The method of manufacturing steel of  claim 22  further comprising drying the solid waste material before mixing the solid waste material with a slag foaming material.  
   
   
       25 . The method of manufacturing steel of  claim 22  wherein the adding of the steel processing material into a second heat of steel comprises injecting the steel processing material with an injection gun.  
   
   
       26 - 27 . (canceled)  
   
   
       28 . The method of manufacturing steel of  claim 23  wherein the steps of melting, drying and adding are repeated until the concentration of heavy metals in the PCM reaches a set point.  
   
   
       29 . The method of manufacturing steel of  claim 28  further comprising sending the PCM to a reclamation process once the concentration of heavy metals in the PCM reaches the set point.  
   
   
       30 . The method of manufacturing steel of  claim 22  wherein the steps are repeated until the concentration of heavy metals in the solid waste material reaches a set point.  
   
   
       31 . The method of manufacturing steel of  claim 30  further comprising sending the PCM to a reclamation process once the concentration of heavy metals in the PCM reaches the set point.

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