LadleSlag

Ladle Deslagging Control

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LadleSlag technology package monitors ladle deslagging operations and ensures that excessive slag carry over is avoided. Deslag evaluates the slag content and feeds information to the operator when a sufficient deslaging has been achieved.

Why LadleSlag?

  • Are you experiencing uncontrolled sulphur increases in the BOF?
  • Are you experiencing uncontrolled reoxidation during ladle treatment influencing on product quality?
  • Do you feel a need to narrow down process variations and operator dependency?
  • Do you need to decrease your metal losses during deslagging?

If you associate with any of the above, LadleSlag will assist you in solving your problem.

Slag carry-over

The problem with slag carry over is well known in steelmaking operations, occurring whenever a slag should be separated from the steel.

A typical indication of poor slag removal from the iron is an unexpected increase in suplur level in the steel after BOF treatment. Any sulphur entering the BOF via carry over slag will transfer to the steel during the highly oxidising conditions of the BOF-treatment.

In steel refining ladle operations slag carry over is usually indicated by unforeseen reoxidation which in turn could result in poor sulphur refining and/or reduced alloying yields.

LadleSlag is specially designed to study slag removal from ladles using a rake, which is commonly used in iron ladles (after desulphurization) and steel ladles (in the final steps of ladle treatment). Regardless of the case of interest, slag is removed from the steel with varying efficiency, thus contaminated slag is carried over to the next processing step.

Metal yield, iron yield

Metal yield

Metal production is, among other factors, a constant battle to keep the metal yield high enough. Any metal lost during processing is money burnt, regardless if the metal may be recovered and/or recirculated after special treatments.

During deslagging the nature of the process inevitably results in metal losses. The metal is removed together with the slag as it is removed by the rake. In many cases, some of this metal is recovered by different recovery operations, e.g. milling and magnetic separation. This is costly and of relatively low yield.

LadleSlag makes sure deslagging is performed as intended and to a degree as defined. Not less and not more. This will ensure a minimum metal loss from the operation which could significantly improve the metal yield from the deslagging process.

LadleSlag metal loss add-on monitors the spout area and warns the operator if any metal is detected, see figure above. As always, data is saved for post-processing evaluation.

LadleSlag screen-shots

LadleSlag operator interface

LadleSlag Operator user interface

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Key features

LadleSlag will use thermal image analyses to evaluate the fraction of slag covering the steel surface in the ladle after deslagging. Processing of image data will be performed in order to estimate the slag content.

LadleSlag will present an objective rating of the slag amount presently in the ladle to the operator that is in control of the slag rake.

LadleSlag will assist the operators in obtaining a sufficient and consistent slag removal – every time.

LadleSlag is prepared for full integration into existing plant systems (Level 1/2/3).

Technology

LadleSlag is based on the thermal imaging technique, using infrared cameras. It is developed by metallurgists for metallurgists where the indepth understanding of your needs guarantees that the functionality needed is there and will give you added value.

LadleSlag uses TCP/IP and industry-standard protocols for data exchange between server, peripherals and external interfaces.

LadleSlag can be configured to work as a dedicated technological package or fully integrated with plant systems.

Demonstration videos

Please check out the videos below clicking the play button. If your company blocks the use of Youtube, please click the link in the download section on the right to view the avi-file instead.

Analysis comparison (raw images + analysis output):

 

LadleSlag user interface (deslagging in progress)