Inclined rotary tube furnaces enable Australian mining laboratories to achieve continuous roasting of rare earth minerals.

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Inclined rotary tube furnaces enable Australian mining laboratories to achieve continuous roasting of rare earth minerals.

1. Client Introduction

Client Name: A Mining Technology Research Institute in Australia
Industry: Mineral Processing, Rare Earth Extraction, Metallurgical Experimentation
Core Needs: To conduct continuous high-temperature roasting experiments on rare earth mineral concentrates (such as monazite and bastnaesite) to optimize roasting temperature, residence time, and atmosphere conditions, improve the leaching rate of rare earth elements, and provide reliable process parameters for industrial scale-up.

This research institute is commissioned by several mining companies to develop rare earth metallurgical processes. Traditional static muffle furnace roasting suffers from uneven material heating, localized over-burning, and difficulty in atmosphere control. Furthermore, batch operation cannot simulate the continuous motion of an industrial rotary kiln. The client urgently needs a tilting rotary tube furnace capable of achieving dynamic continuous roasting of powder materials on a laboratory scale, with precise control of temperature, residence time, and furnace atmosphere, providing data support for the subsequent design of a 10,000-ton-class rotary kiln.

2. Equipment Introduction

Equipment Name: Inclined Rotary Tube Furnace (Laboratory Type Rotary Furnace)

Product Model: PT-R150*1800-1000

Operating Temperature: ≤1100℃ (Common Firing Temperature: 600～950℃).

Furnace Tube Material: High-purity quartz tube (high temperature resistant, transparent for easy observation) or 310S stainless steel tube (quartz tube is used in this case, outer diameter 100mm, heating zone length 800mm).

Furnace Tube Inclination Angle: 0～10° continuously adjustable, used to control the residence time of materials in the tube.

Rotation Speed: 0～15 rpm adjustable, allowing materials to undergo a "tumbling + axial movement" composite motion.

Feeding Method: Batch or continuous (manual continuous feeding is used in this case—via a screw feeder or manual quantitative feeding).

Heating Method: High-quality resistance wire heating, lightweight ceramic fiber furnace chamber, rapid heating, energy saving.

Temperature Zone Configuration: Single temperature zone or optional dual temperature zone (single temperature zone in this case, temperature field length 600mm).

Temperature Control System: PID+SCR programmable temperature control, accuracy ±1℃, 30-segment programmable.
Atmosphere Control: Sealed flange system, allows for the introduction of air, N₂, Ar, or weakly reducing atmospheres (such as CO/CO₂ mixtures).

Discharge Method: Material is automatically discharged from the lower end by gravity and rotation; a cooling receiving tank can be added.

Control System: Centralized touchscreen control, real-time display of rotation speed, tilt angle, temperature, and running time.

Safety Protection: Over-temperature alarm, furnace tube overpressure protection, and rotary motor overload protection.

This tilting rotary tube furnace is specifically designed for high-temperature dynamic heat treatment of powders/granular materials. It can simulate the working conditions of an industrial rotary kiln on a laboratory scale and is suitable for mineral roasting, catalyst activation, activated carbon regeneration, battery material processing, and plastic pyrolysis. Its core advantages are: adjustable tilt angle and rotation speed for precise control of material residence time; dynamic material tumbling to ensure uniform heating of each particle; and a sealing system supporting multiple atmospheres to meet the requirements of oxidizing, reducing, or inert environments.

3. Equipment Application

Specific Process: Sulfation roasting of rare earth mineral concentrate (monazite).

Processed Material: Monazite concentrate from a mining area in Australia (mainly containing rare earth phosphates such as Ce, La, Nd, and Pr, with a total rare earth oxide content of approximately 55-60%).

Roasting Purpose: To convert sparingly soluble rare earth phosphates into rare earth sulfates soluble in dilute sulfuric acid, thereby improving the recovery rate in subsequent leaching processes.

4. Customer Feedback

"We've been using this tilting rotary tube furnace for over a year, primarily for sulfation roasting of rare earth ores and chlorination roasting of lepidolite. The greatest value of this equipment lies in its ability to truly simulate the dynamic roasting process of an industrial rotary kiln on a laboratory scale. Previously, data obtained using a static muffle furnace always showed discrepancies when scaled up to an industrial rotary kiln because static roasting ignored the effects of material movement and mass transfer. Now, with this tilting rotary tube furnace, we can precisely control the tilt angle and rotation speed, establishing a mathematical model of residence time and conversion rate. The transparent quartz tube allows for constant observation of the material's tumbling state and whether ring formation occurs, which is extremely helpful for process diagnostics. The equipment is also very easy to operate. After setting the temperature, rotation speed, and tilt angle, we simply add material periodically from the feed end, and the product is automatically collected from the discharge end. We can complete ten sets of experiments under different conditions in one morning. The equipment provided by your company has already helped us complete process development for three mining projects, two of which have entered the pilot-scale stage. We are planning to purchase a larger-capacity continuous tilting rotary furnace to expand our experiments."

— Head of Metallurgical Laboratory, Mining Technology Research Institute, Australia Dr. Sarah Thompson

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