What are the differences between metallurgical coke and semi-coke?
1. The raw materials
Generally, the raw materials of coke products are mainly coking coals with strong binding properties, such as coking coal and fat coal; generally, semi-coke is produced from a single coal, and no coal blending is required in the production process.
2. Quality
Compared with generally coke products, semi-coke has the advantages of high fixed carbon, high specific resistivity, high chemical activity, low ash content, low sulfur, low phosphorus, low moisture, etc. "three highs and four lows",
3. Applications
Common coke products are mostly used in metallurgical industries such as blast furnace ironmaking and casting.
Semi-coke cannot be used in blast furnace production. However, in ferroalloy, calcium carbide, fertilizer and other industries, Semi-coke can completely replace general coke, and its quality is better than many national standards for metallurgical coke, foundry coke and ferroalloy special coke. Therefore, Semi-coke is improving the quality of downstream products, saving energy, It has higher application value in terms of reducing production costs and increasing output. At the same time, Semi-coke also has development potential in the fields of blast furnace injection, production of carbonized materials, and activated carbon.
4. Production Technology
In general, the technical production of coke products is mostly high-temperature dry distillation, and the dry distillation temperature usually needs to reach about 1000 ℃.
The production of Semi-coke is mostly based on low-temperature dry distillation, and the dry distillation temperature is generally around 600 ℃
5. Prices of semi-coke and general coke products
Due to differences in raw materials and processes, the market price of semi-coke is much lower than that of ordinary coke. Taking 2006 as an example, the market price of semi-coke was around 300 yuan/ton, and the average price of the lowest grade coke (10-25 mm) was also around 760 yuan/ton. The relatively low market price makes semi-coke products have higher market competitiveness.
In general, compared to coke, semi-coke has a wider range of use, stronger practicability, and low cost. Therefore, semi-coke is now one of the preferred materials for alloy smelting.
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