An ashing furnace is a high-temperature heating device specifically designed for measuring the ash content of samples. It is a specialized application of a muffle furnace. It removes organic components from samples through high-temperature combustion, retaining the inorganic residue (ash). It is widely used in quality testing and analytical research in the food, chemical, environmental protection, coal, and pharmaceutical industries.

Basic Working Principle
High-temperature oxidation principle: At a controlled temperature (typically 500-900°C), organic matter in the sample undergoes a complete oxidation reaction with oxygen, generating CO₂ and H₂O that volatilize, leaving behind inorganic salts and minerals.

Pyrolysis principle: Some samples undergo pyrolysis in the absence of oxygen, decomposing organic components into volatile substances and fixed carbon. Ultimately, the carbon is also oxidized and removed.

III. Main Components

1. Furnace System
   Furnace Chamber Material: High-purity alumina ceramic fiber or polycrystalline mullite fiber, offering excellent high-temperature resistance (up to 1200°C)

Insulation: Multi-layer nanoporous insulation effectively reduces heat loss

Casing: Double-layer stainless steel with forced air cooling

2. Heating System
   Heating Elements: High-quality resistance wire (nickel-chromium alloy) or silicon carbide rods

Heating Method: Surround heating to ensure temperature uniformity (within ±5°C)

Heating Rate: Programmable, up to 30°C/min

3. Control System
   Temperature Controller: Utilizes PID intelligent control algorithm, with an accuracy of ±1°C

Human-Machine Interface: 7-inch color touch screen with multi-language support

Data Logging: Built-in memory can store 100 programs and supports USB export

4. Safety Protection System
   Overtemperature Protection (dual thermocouple monitoring)

Overcurrent Protection

Automatic power off when furnace door is opened

Abnormal Alarm System

V. Classification of Ashing Furnaces

1. Classification by Application
   Food Ashing Furnaces: Temperatures typically ≤ 600°C, complying with AOAC standards

Coal Ashing Furnaces: Temperatures up to 815°C, complying with ASTM standards

Pharmaceutical Ashing Furnaces: Equipped with precise weighing capabilities, complying with USP standards

Environmental Monitoring Ashing Furnaces: Used for atmospheric particulate matter analysis

2. Classification by Heating Method
   Resistive Ashing Furnaces: Most common, with precise temperature control

Infrared Ashing Furnaces: Fast heating and energy-efficient

Microwave Ashing Furnaces: Short processing time, but expensive

VI. Typical Applications

1. Food Industry
   Determination of Ash Content in Cereals and Flour (GB 5009.4)

Mineral Content Analysis of Dairy Products

Condiment Purity Testing

2. Coal and Petroleum
   Determination of Coal Ash (GB/T 212)

Ash Analysis of Petroleum Coke (ASTM D4422)

3. Pharmaceutical Industry
   Inspection of Residue on Ignition of APIs (Chinese Pharmacopoeia General Chapter 0841)

Determination of Heavy Metal Content in Traditional Chinese Medicines

4. Environmental Monitoring
   Analysis of Atmospheric Particulate Matter (PM2.5/PM10) Composition

Sludge Incineration Residue Testing

VII. Operational Procedure (Taking Food Ash Content Determination as an Example)

Sample Preparation

Accurately weigh 2-5g of sample into a crucible that has been pre-ignited to a constant weight.

Pre-dry the sample.

Carbonization Stage

Place the crucible on an electric furnace and carbonize at low temperature until smoke is eliminated.

Ashing Stage

Transfer the crucible to an ashing furnace preheated to 525±25°C.

Maintain temperature until complete ashing (usually 2-4 hours).

Cool and weigh.

Remove and cool in a desiccator to room temperature.

Accurately weigh and calculate ash content.

Lab Ash Furnace Technical Parameters

Model	Max.temperature	Inner volume	Inner size	Power and Voltage
YX-1200-1L	1200℃	1L	105*105*110mm	1KW/AC220V
YX-1200-4.5L	1200℃	4.5L	150*150*200mm	2.5KW/AC220V
YX-1200-7.2L	1200℃	7.2L	200*120*300mm	3KW/AC220V
YX-1200-18L	1200℃	18L	250*250*300mm	5KW/AC220V
YX-1200-36L	1200℃	36L	300*300*400mm	9KW/AC380V
YX-1400-3.6L	1400℃	3.6L	150*150*160mm	4KW/AC220V
YX-1400-8L	1400℃	8L	200*200*200mm	6KW/AC220V
YX-1400-18L	1400℃	18L	250*250*300mm	9KW/AC220V

Lab Ash Furnace video

在线留言

Online Message