SU1468876A1 - Method of producing lime - Google Patents

Abstract

The invention relates to the industry of building materials, primarily to the production of highly active lime, which can be used as the main component of a non-explosive destructive agent. The aim of the invention is to increase the expansion force. Known to the size of 1-2.5 mm served in the fluidized bed unit. In the dissociation zone, CaCOj is subjected to decarbonization to CaO and CO at 950-1200 ° C for a firing duration of at least 15 minutes. From the dissociation zone, the obtained fine crystalline porous lime is fed to the high-temperature recrystallization zone with the temperatures of gases and material and with a heating rate of 2700-310 ° C / min, depending on the properties of limestone within 14-40-1520 C with a recrystallization time of 30-40 minutes. From the recrystallization zone, the finished product was returned to the refrigerator with cooling air. The expansion force is 35-59 MPa, the porosity is 4.4-4.8%. 1 tab. S (l

Description

The invention relates to the production of building materials, primarily to the production of highly active lime, which can be used as the main component of a non-disruptive destructive agent.

The aim of the invention is to increase the expansion force.

The proposed method is carried out as follows.

Known to the size of 1-2.5 mm dispenser filed in the unit fluidized bed. In the dissociation zone, CaCf, they decarbonized to CaO and COj,

at 950 - 1200 s and the duration of burning is not less than 15 minutes. From the dissociation zone, the obtained crystalline porous lime was supplied to the high-temperature recrystallized zone. with the temperature of gases and material and with a heating rate of 2700 - 3100 C / min, depending on the properties of limestone within 1420 - 1520 C for a recrystallization time of 30 - 40 minutes. From the recrystallization zone, the finished product was submitted to an air cooled refrigerator.

Waste gases from the recrystallization zone together with small particles

(35 00

the finished product entered the hot cyclone, from which the finished product entered the refrigerator cooled by air, and the exhaust gases were used for calcining limestone,

The table shows the technological parameters of the processing of these limestones both by known methods and the proposed one.

Modes 9-14 provide a reduction in lime porosity of up to 5-6% of the formation of large, undeformed CaO crystals, tightly packed together due to the additional dynamic effect of colliding grains in the high-temperature fluidized bed zone.

The above parameters of heat treatment ensured complete dissociation of CaCO with the formation of non-cracked fine-crystalline lime. Heat from the heating zone was used as a heat carrier.

crystallization; 1, containing oxygen

less than 5%

Thus, the proposed method allows lime to be obtained with an activity of more than 92%, a porosity of less than 5% and with an expanding force of 35 to 59 MPa,

Claims (1)

Invention Formula The method of obtaining by crushing limestone, dividing it into fractions, heat treating up to 1450-1550 s and cooling, is made in that, in order to increase the spreading force, the limestone is fractionated to fraction 1-2.5. mm and subjected to a two-stage heat treatment, the first stage being carried out at 950-1ZOO C with a heating rate of 400-600 degrees / min for 15-20 minutes, and the second with a heating rate of 2700-3100 degrees / min for less than 30 minutes up to 1450-1550 C,