Active Lime Production Line_ZK Ball Mill_Rotary Kiln

1

INTRODUCTION
2

SPECIFICATIONS
3

PROCCESS

We adopt the new type, energy saving and environmental system of active lime production process, through which fuel consumption can be reduced 40%, output capacity increased 30%.

Active lime production line (Active lime plant project) refers to the whole process of active lime production. During all the active lime production process, the rotary kiln production process is the most advanced one. Our production process adopt the rotary kiln with the vertical preheater and vertical cooler for the limestone calcination to achieve the production requirements of energy saving, environmental protection, the high activity. We can provide technological solutions and complete production equipment for 50-1200TPD quicklime (active lime) production line.

PRODUCTION PROCESS
Step 1. Raw Material Preparation
1. Limestone: The particle size of limestone should be between 10～40mm. The proportion of limestone size above 40mm or below 10mm should not be more than 5%. The maximum size should be less than 40mm.
2. Fuel：Furnace gas, gas, coalbed methane, pulverized coal could be used as fuel.
3. Indicator: The quality indicators of the final products can meet the industry standard YB/T042-2004 above the first grade (see table below).
Step 2. Raw Material Feeding
Limestone in the plant yard will be carried by tractor shovel and fed to hopper, it will be discharged from hopper to vibrating feeder and sent to vibrating screen for screening through belt conveyor. The size ≥20mm will be sent to pre-heater by conveyor. And size less < 20mm will be carried away.

Step 3. Limestone Calcination
Limestone in the pre-heater will be preheated by the hot air, then it will be discharged to rotary kiln through chute that connecting pre-heater and kiln, it will stay in the kiln for 1.5-2 hours for calcination, during the process, it will be calcinated with temperature around 1300 ℃, after which comes limestone decomposition and release of co2,then the for mation of quick lime qill be completed.
Step 4. Finished Products Conveying
Lime will be discharged to a chain conveyor by vibrating feeders in the bottom of vertical cooler, it will be lifted to lime in the storage hopper can be used for dispatch or transported to the hydration workshop.

Step 5. Dust Filtering System
There are two dust filtering systems, one is in the kiln inlet, dust will be filtered by bag filter then the clean gas will be released to air. The other is dust from lime storage hopper and the feeding part of bucket elevator, dust will be filtered by bags and then released to air.

Capacity		200t/d	225t/d	250t/d	300t/d	400t/d	500t/d	600t/d	800t/d
Preheater	Shape	Hexagon	Hexagon	Octagon	Octagon	Octagon	Decagon	Dodecagon	Dodecagon
	Qty. Of Top Silo	6	6	8	8	8	10	12	12
	Qty. Of Hydraulic Pusher	6	6	8	8	8	10	12	12
	Preheating Capacity (t)	600	600	800	800	800	1000	1600	1600
Rotary Kiln	Size	Φ2.8×42m	Φ3.0×50m	Φ3.2×50m	Φ3.3×55m	Φ3.6×55m	Φ38×58m	Φ4×60m	Φ4.3×56m
	Slope	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%	3.50%
	Rotating Speed (r/min)	0.3-1.8	0.3-1.8	0.3-1.8	0.3-1.8	0.3-1.8	0.3-1.8	0.3-1.8	0.3-1.8
	Calcination Temperature (℃)	1350	1350	1350	1350	1350	1350	1350	1350
Cooler	Type	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical	Vertical
	Qty Of Temperature Control Area	3	3	3	3	3	3	3	3
	Qty. Of Wind Tower	4+1	4+1	4+1	4+1	4+1	4+1	4+1	4+1
	Size(m)	3.6×3.6	3.6×3.6	3.6×3.6	3.6×3.6	4.1×4.1	4.1×4.1	4.1×4.1	4.7×4.7
	Output Temperature (℃)	≤120	≤120	≤120	≤120	≤120	≤120	≤120	≤120
Product Thermal Loss(kcal/kg)		5500	5400	5400	5400	5400	5400	5400	5000
Available Fuel		Coke oven gas, mixed gas, natural gas, coal powder, low heating value coal gas