Usually lime degree of activity than the average 300ml / 4N-HCl, can significantly reduce the initial converter steelmaking slag of time active lime powder supply, reduce consumption of lime, and the pre-de-P is extremely beneficial activity of lime powder sales, known as active lime. It should be used in the production of active lime limestone material less impurities. Lime: quicklime lump during placement will slowly absorb moisture from the air and automatically cooked into lime powder, and then with carbon dioxide to form calcium carbonate role in the air, losing cement capacity. Therefore, when the storage lime, not only to prevent moisture, and should not be stored for too long.