Method for roasting ultralow-carbon lime in rotary kiln and lime product produced by same
A technology of rotary kiln and limestone, which is applied in the field of ultra-low carbon lime roasting in rotary kiln and lime products produced by it, can solve problems such as inability to meet quality requirements, and achieve the effects of low production cost, good moisture resistance and long shelf life
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[0046] Example 1
[0047] Prepare 20-40mm limestone before the experiment, with a particle size exceeding the upper and lower limit and not exceeding 3%, the raw material S content is 0.02wt%, and the CaO content is 52wt%.
[0048] The main parameters of rotary kiln calcination are controlled according to the following standards: speed 0.73 rpm, calcination temperature 1010℃, kiln head temperature 650℃, secondary air volume 53000Nm 3 / Hour, the coal injection rate is 6800 kg / hour, and the fuel injection rate is 6L / min.
[0049] After being calcined for 1.5 hours, it was cooled to 100°C and crushed by a PC300×400mm hammer crusher to obtain lime with a particle size of 0-15mm. The lime was sieved through a linear vibrating screen with an upper layer of 12mm and a lower layer of 5mm to obtain a particle size of 2- 12mm lime is passivated by adding calcium chloride to obtain a lime product.
Example Embodiment
[0050] Example 2
[0051] Prepare 20-40mm limestone before the experiment, with a particle size exceeding the upper and lower limit and not exceeding 3%, the raw material S content is 0.02wt%, and the CaO content is 52wt%.
[0052] The main parameters of rotary kiln calcination are controlled according to the following standards: rotation speed 0.8 revolutions per minute, calcination temperature 1050 ℃, kiln head temperature 920 ℃, secondary air volume 55000Nm 3 / Hour, coal injection rate is 7200 kg / hour, fuel injection rate is 10L / min.
[0053] After calcination for 2.5 hours, it was cooled to 150°C and crushed with a PC300×400mm hammer crusher to obtain lime with a particle size of 0-15mm. The lime was sieved through a linear vibrating sieve with an upper layer of 12mm and a lower layer of 5mm to obtain a particle size of 2- 12mm lime is passivated by adding calcium chloride to obtain a lime product.
Example Embodiment
[0054] Example 3
[0055] Prepare 20-40mm limestone before the experiment, with a particle size exceeding the upper and lower limit and not exceeding 3%, the raw material S content is 0.02wt%, and the CaO content is 52wt%.
[0056] The main parameters of rotary kiln calcination are controlled in accordance with the following standards: speed 0.76 rpm, calcination temperature 1030°C, kiln head temperature 785°C, secondary air volume 54000Nm3 / h, coal volume 7000 kg / h, fuel injection volume 8L / min.
[0057] After calcination for 2 hours, it was cooled to 120°C and crushed with a PC300×400mm hammer crusher to obtain lime with a particle size of 0-15mm. The lime was sieved through a linear vibrating sieve with an upper layer of 12mm and a lower layer of 5mm to obtain a particle size of 2- 12mm lime is passivated by adding calcium chloride to obtain a lime product.
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