Refractory TestingRefractories

High-Temperature Dynamic Slag-Resistance Furnace

The GZL-B tests refractory resistance to erosion by molten dynamic slag at high temperature using method 3 of GB/T 8931-2007, the rotating-specimen gas-flow method. It is a vertical atmosphere furnace with air or protective-gas melting and four rotating suspended specimens.

Model
GZL-B
Category
Refractory Testing
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Product description

Product Description

The furnace uses silicon–molybdenum-rod heating, platinum–rhodium temperature measurement, programmable closed-loop PID control, and a rotating mechanism that moves specimens through the slag. Air, nitrogen, or argon protective atmospheres are available.

Key parameters include heating rates, power, gas flow, control and holding accuracy, specimen and crucible dimensions, rotation speed, and the crucible lifting and slag-addition arrangements.

Specifications

Technical Specifications

ParameterSpecification
Referenced standardGB/T 8931-2007
Maximum operating temperature1,600 °C
HeatingSilicon–molybdenum rods
Temperature sensorsPlatinum–rhodium thermocouple; B-type thermocouple
Heating rate1–15 °C/min from room temperature to 1,300 °C; 1–5 °C/min from 1,300–1,600 °C
Rated heating powerApproximately 16 kW
Temperature controlClosed-loop PID; programmable 50-segment curve; control accuracy ±1 °C; holding accuracy ±2 °C
AtmosphereAir, nitrogen, or argon protective atmosphere
Gas flow0–10 L/min
Specimen size40 × 40 × 230 mm; 4 specimens
Rotation4 specimens suspended in slag; planetary motion; 5–30 rpm
Crucible inner diameter210 mm
Crucible outer diameter220 mm
Crucible internal height165 mm
Molten-iron height80 mm
Slag height40 mm
Specimen immersionApproximately 20 mm above crucible bottom
Protective crucibleGraphite
Crucible movementRaised from below the furnace
Slag additionDedicated slag-addition port
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