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Moisture in Sinter Mix  

Moisture measurement is extremely important in sinter mix as moisture % affects pre-ignition gas permeability and other burn characteristics which in turn influences ore reduction rate and final quality.

Sinter Production Process
Sinter mix comprises mainly ore (e.g. iron or zinc), limestone and coke. Other ingredients such as dolomite, manganese, and lime may be incorporated into the mix. The “recipe” for the raw mix is critical to sinter quality, thus the moisture level and weight of each ingredient is important. The ingredients are apportioned, and fed into mixing rolling drums to homogenize the mix, then it is conveyed to the conditioner where moisture is added to its optimum % before being fed to the Sinter Strand.

Measurement Locations

1. On individual components e.g. limestone,
2. On the conditioner inlet (4-5%), possibility for feed forward loop.
3. On the conditioner outlet (7-8%), this allows closed-loop moisture control prior to feeding the Sinter Strand.

Gauge Installation
The gauge should be positioned 6-15” from the product, and 20o C to the perpendicular if the surface appears reflective (perpendicular otherwise), this pass height tolerance allows for variations in bed depth.

Product flow should be continuous and of sufficient depth that the transporting medium isn’t seen by the gauge. If flow is discontinuous, a gating option can be used to enable measurement only when product is viewed.

 
 
Measurement Performance
Measurement Location Target % Typical Accuracy%
Limestone crushed Pre-Mixer 4-6% 0.2%
Conditioner Inlet Sinter Mix 4-6% 0.3%
Sinter Mix Conditioner Outlet 7-8% 0.3%
 
 
Note: in certain processes when changing to a new sinter bed, fine tuning the calibration may be required to compensate for differing sources of the iron ore.
 
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  Process Sensors Moisture Transmitters

MCT 460: Used in a wide variety of industrial processes, the MCT 460 Multi-Constituent NIR Transmitter, a True Stand-Alone Transmitter, provides off-line accuracy under on-line operating conditions. Read more about the MCT 460 moisture sensors...

MCT 460-T: The MCT 460-T measures moisture... the most critical variable in tobacco processing... providing the world's most accurate, reliable and stable moisture measurement for the tobacco industry. Read more about the MCT 460-T moisture measurement tool...

MCT 460-WP: The MCT 460-WP uses a well proven algorithm which works on a wide range of wood varieties and forms. You choose the mode of operation, stand-alone or networked. Read more about the MCT 460-WP moisture measurement tool...

MCT 330HD: The MCT 330HD features a heavy duty stainless steel enclosure, is resistant to high temperatures, is sealed for wash down environments, and provides reliable, continuous moisture measurement. Read more about the MCT 330HD moisture measurement tool...

MCT 466-SF: The MCT 466-SF features a food grade optical window, a robust stainless steel enclosure, and reliably operates in high temperature locations, measuring moisture, oil & product temperatures. Read more about the MCT 466-SF moisture measurement tool...

MCT 466 QuikCheck: Used for quality control in a wide variety of industrial processes, the MCT 466 QuikCheck bench top NIR Tester provides fast accurate results every time. Read more about the MCT 466 QuikCheck moisture analyzer...

GUARDIAN: The Guardian Scanning Frame System is comprised of three components: MCT-460 NIR Transmitter, the automated Scanning Frame and a PC with Automated Guardian Profile Software. Read more about the GUARDIAN Scanning Frame System...