A New Fully Automatic Rotary Enamel Smelter
Release time:
2026-03-18 14:57
Source:
Glass and Enamel
Enamel frit is a glassy substance composed of an alkali-boron-silicon system, used to coat metal blanks. After firing, the enamel frit adheres firmly to the metal blank, providing both protection and decoration.
The basic components of enamel frit are a matrix agent, flux, opacifier, adhesive, and colorant. Various raw materials are accurately weighed according to the chemical composition of the formula, mixed thoroughly, and then melted at a high temperature (1250–1400℃) through a series of physicochemical reactions. The molten glass is then rapidly cooled in water to form a stable enamel frit.
1. Enamel Frit Melting Equipment
The main thermal equipment for melting enamel frit includes three types: crucible furnace, tank furnace, and rotary furnace.
A crucible furnace, also known as a round furnace (or square furnace), employs an intermittent operation method where the batch material is melted at high temperatures in a crucible. Multiple crucibles can be placed in a single furnace to melt enamel frits of different compositions. Its output is low, thermal efficiency is low, labor intensity is high, and the working environment is harsh.
A tank furnace, on the other hand, is characterized by continuous operation. Tank furnaces are divided into direct-smoke furnaces and horseshoe-flame furnaces. Direct-smoke furnaces are further divided into single-arch furnaces and double-arch furnaces. A single-arch direct-smoke furnace lacks a heat exchange chamber (or regenerator), has a simple structure, and requires less investment, but over 1000% of the high-temperature flue gas is directly discharged through the chimney, resulting in lower thermal efficiency. Horseshoe-flame furnaces, conversely, have a complex structure, require more investment, but have higher thermal efficiency. The performance of a double-arch furnace falls between the two. In a double-arch furnace, the feeder continuously feeds the batch material from the feed port, and the molten glass continuously flows out from the discharge port, then is pressed into sheets or water-quenched into solid enamel granules. The advantages of a tank furnace are high output, high thermal efficiency, and stable operation. However, it can only melt a single type of enamel frit at a time, and there is a large amount of transition material during material changes, which is not conducive to multi-variety production.
A rotary furnace furnace melts the batch by feeding it into a rotating horizontal rotary furnace. The combustion flame is directly injected from one end of the furnace onto the tumbling batch, causing it to melt. This method operates intermittently. It has a high output and produces enamel frits of more uniform quality.
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