For consumers, they hope to buy qualified products when purchasing metallic silicon. As for metallic silicon manufacturers, only by ensuring the quality of metallic silicon can they win the attention of more users and achieve good development.
Therefore, it can be seen that both consumers and manufacturers are very concerned about the quality of metallic silicon. So what are the standards for judging the quality of metallic silicon? Hensfate Metal will briefly explain this question to everyone.
1. Phosphorus content in metallic silicon: The phosphorus content of metallurgical coke used for ironmaking should be below 0.02-0.03%.
2. Ash content in metallic silicon: The ash content of metallic silicon has a very significant impact on blast furnace smelting. The ash content of metallic silicon increases by 1%, and the dosage of metallic silicon increases by 2-2.5%. Therefore, it is very necessary to reduce the ash content of metallic silicon.
3. Volatile components in metallic silicon: The maturity of metallic silicon can be judged based on the volatile content of metallic silicon. If the volatile matter is greater than 1.5%, it means coke is raw; if the volatile matter is less than 0.5-0.7%, it means it is overcooked. Generally, the volatile matter of mature metallurgical coke is about 1%.\
4. Moisture in metal silicon: Fluctuations in moisture will cause inaccurate measurement of metal silicon, causing fluctuations in furnace conditions. In addition, the increase in the moisture content of metal silicon will cause M40 to be higher and M10 to be lower, which will bring errors to the drum index.
5. Screening composition of metallic silicon: The particle size of metallic silicon is also very important in blast furnace smelting.
In the past, China's requirements for the particle size of metallic silicon were: for large coke ovens (1300-2000 square meters), the particle size of metallic silicon was greater than 40 mm; for medium and small high-rise metal silicon, the particle size was greater than 25 mm. The metal silicon particle size is preferably 40-25 mm. Metallic silicon larger than 80 mm should be granulated so that the particle size range does not change much. In this way, the metal silicon block has uniformity, large gaps, small resistance, and the furnace operates well.
Sulfur in metallic silicon: Sulfur is one of the harmful impurities in pig iron smelting, which reduces the quality of pig iron. In steelmaking pig iron, sulfur content greater than 0.07% is considered waste. 11% of the sulfur brought into the blast furnace charge comes from ore; 3.5% comes from limestone; 82.5% comes from metallic silicon, so metallic silicon is the main source of sulfur in the charge. The level of sulfur content in metal silicon directly affects blast furnace ironmaking production. When the sulfur content of metallic silicon is greater than 1.6%, for every 0.1% increase in sulfur content, the usage of metallic silicon increases by 1.8%, the limestone addition increases by 3.7%, the ore addition increases by 0.3%, and the blast furnace output decreases by 1.5-2.0%. The sulfur content of metallurgical coke is stipulated to be no more than 1%, and the sulfur content of metallurgical coke used in large and medium-sized blast furnaces is less than 0.4-0.7%.
These are the standards for measuring the quality of metal silicon. I hope that everyone can use these to quickly and accurately determine whether the quality of metal silicon is qualified, thereby protecting their own rights and interests. If you still don’t know which silicon metal manufacturer you should buy, please feel free to contact our company. Our company will provide you with qualified silicon metal according to your needs.
