Rotary kiln lime roasting process

• Main Authors: YAN XUDONG, WANG XIAOXIONG, SHEN HAO, BIAN ZHENGPEI
• Format: Patent
• Language: English
• Published: 02.09.2015
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF NATURAL STONE

The invention discloses a rotary kiln lime roasting process comprising the following steps: (1), putting a raw material namely lime into a preheater for preheating at first, guiding the flue gas generated by pulverized coal combustion in a rotary kiln into the preheater to preheat the lime by using waste heat, and then discharging the lime, wherein the preheater is communicated with the kiln tail of the rotary kiln; and (2), roasting the preheated lime discharged from the preheater in the rotary kiln which is heated by burner nozzle pulverized coal injection, adding the roasted lime into a cooler from the kiln head to perform cooling, and finally discharging the cooled lime from the bottom of the cooler, wherein in the step (1), a pulverized coal spray gun is arranged at the lower part of the preheater to spray the pulverized coal accounting for 5-30% of the coal spraying quantity of the burner nozzle of the original rotary kiln into the preheater so as to improve the preheating temperature in the preheater, and the pulverized powder sprayed into the preheater is independently measured.