The previous article analyzed the consumption of coke, electricity, gas and other aspects of cupola furnaces, induction furnaces and other methods from a cost perspective. This time, the advantages of pure oxygen gas-fired iron melting rotary furnace will be analyzed from the aspects of comprehensive technical indicators and environmental protection.

The pure oxygen gas rotary furnace has the following characteristics: 1. Each ton of iron emits 40-60m³ carbon dioxide, the carbon emissions are less than 30% of the coke-burning cupola, and the carbon emissions are less than the carbon emissions of coal-fired electricity used in the induction furnace. 20% of the value; there is no sulfur dioxide and nitrogen oxides in the exhaust gas, which is beneficial to environmental protection. 2. The equipment investment is lower than that of induction furnace, and the construction cost is low. The construction cost is close to that of ordinary coke-burning cupola furnace. 3. The melting cost is lower than that of induction furnace and higher than that of cupola furnace. 4. The most adaptable. It can produce gray cast iron, ductile iron, vermicular graphite cast iron, malleable cast iron, alloy cast iron and other cast irons. 5. When producing ductile iron, the molten iron does not need desulfurization treatment, which can save the cost of desulfurization agent. Compared with coke-burning cupola furnaces, the cost of carbon addition in rotary furnaces will be higher. 6. The flexibility of the rotary furnace in terms of production organization is the same as that of the induction furnace, and is superior to the cupola furnace. It is very suitable for small and medium-sized factories with small batches and large varieties of single pieces or small batch production; it is suitable for manual molding or simple mechanized molding. factories, but not suitable for foundries with automatic molding lines.

The environmental protection of the pure oxygen gas regenerative iron furnace is better than any existing cast iron melting furnace. Now compare the waste gas, waste slag, etc. emitted by melting one ton of metal charge and various melting furnaces, as shown in the table.

The above comprehensively analyzes the advantages of pure oxygen gas rotary furnaces in terms of cost, environmental protection, and comprehensive technical indicators. Major manufacturers should choose the appropriate furnace according to their actual conditions.