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Slag Detection System(SDS-E)
Not available in USA and Canada
Slag Detection System - thermal image   The definitive infrared thermal imaging system for steel slag monitoring

When liquid steel is tapped from a basic oxygen or electric arc furnace, it is advantageous to minimise the quantity of slag carried over into the ladle.
Previously this has been done by visual observation of the tapping stream or by the use of electromagnetic induction coils mounted onto the furnace. However, neither of these methods has proved to be entirely reliable.

The SDS display allows users to observe critical tap information such as the live thermal image, steel and slag percentages, time versus percentage graph, alarm level and alarm status.   The new LAND thermal imaging Slag Detection System SDS has been developed using Land’s expert knowledge of the application and over 58 years of experience in the steel industry to monitor and aid control of slag carry-over from one process to another.
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Slag Detection System  
The SDS system is specially designed to withstand the harsh conditions of continuous operation in the steel plant, with minimum maintenance required. The industrial thermal imaging sensor is housed in a rugged water-cooled and air purged enclosure, continuously viewing the tapping area.

As the tap commences, the dedicated SDS Software automatically begins to record the tap as well as producing a data log and graph of the relevant steel/slag data.

The difference in emissivity between the steel and slag results in slag displaying significantly higher apparent temperature than steel when seen by the thermal imager.

When the level of the slag reaches the predetermined level an alarm is generated to stop the tap. The recording will end and the files saved by tap number. Full access of the tapping data is available to the operator for quality control purposes.
Problems of Slag Carry-Over
Slag layer hinders addition of alloys and conditioners
High levels of FeO and MnO results in high oxygen content of steel leading to increased processing time & treatment costs
High inclusion formation, steel cleanliness problems and increased risk of nozzle clogging in the caster
Phosphorous reversion in the ladle
Poor ladle desulphurisation
Ladle refractory wear
Benefits of the Slag Detection System
Automatic operation
Enhanced data output for tap analysis
Accurate detection independent of charge weight
Reliable alarm independent of operator
Improved yield
Lower slag content improving steel quality
Lower maintenance on BOF/EAF vessel
Reduced energy costs


Slag Detection System - thermal image

Slag Detection System - thermal image

Slag Detection System - thermal image

Slag Detection System - thermal image

Slag Detection System - thermal image
  This comprehensive, fully featured software system has been developed to provide the steel plant engineers and managers with the tools to develop and improve the transfer of steel from one process to another.

SDS offers the steel plant a number of interconnectivity methods for on-line control and, more importantly, it automatically records the tap data in three forms for post analysis and future process improvement.

In addition to this, the image processing system has been pre-installed and configured to work straight out of the box – minimum set-up is required. Once the system hardware is installed onto the steel plant, the moment the system is turned on, the steel plant can immediately begin to reduce slag carryover. No other thermal slag detection system currently available offers these features.

Pre-installed on the powerful image processing system, the display allows users to observe critical tap information such as the live thermal image, steel and slag percentages, time versus percentage graph, alarm level and alarm status.

Secondary information such as tap number, sensor temperature, comms status, tap duration, steel / slag ratio and record status are less prominent so as to not distract the user during the tap.

Up to four users can also view remotely a condensed view of the live tap anywhere on the plant network by using the remote viewer software.

At the end of the tap the video, text data and graph are saved by tap number for later analysis and can be automatically deleted after a user defined number of days.

Inputs and outputs from the steel plant and slag detection system include: digital output, DDE, OLE, Ethernet and OPC.

Connecting the image processing system to the plant network via either OPC or Ethernet protocols allows live data transfer to and from the slag detection system to improve the steel transfer process.

Data to the slag detection system includes tap number, alarm level and five unique variables specified by the steel plant such as charge-number, heat-number, steel grade and tap temperature. When used, these data are recorded in the saved text data file.

Data output from the system can be transmitted at the equivalent of 25 frames per second.

This information includes steel slag percentage, alarm status, sensor temp and communications status.

Literature downloads on this product are available. (This product is not available in the USA and Canada)
English version Last Modified (2017/06/02) (1.2 MB)

If you would like more detailed information on this product please complete the form on the Literature Request page.
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