• Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line
  • Active Lime Production Line

Active Lime Production Line

Capacity:50-800(t/d)

Main Materials:Limestone

Main Equipment:vertical preheater, lime kiln, bag filter

Lime Activity:≥360mL

Introduction

Lime can be divided into two types: ordinary lime and active lime. The former is mostly fired in earth kilns and ordinary shaft kilns, and its activity is generally within 200ml, which is mainly used for construction and road repair; the latter is mainly composed of mechanical shaft kilns and rotary kilns. After calcination, the activity can reach 300~420ml. Limes calcined in rotary kilns are of better quality, and they are mainly used in industries such as steel smelting, chemical industry and power plant desulfurization.
 
Raw Material:
1. Limestone
The particle size of limestone is required to be 10-40mm, and the part exceeding the upper limit of 40mm and the lower limit of 10mm shall not exceed 5%.
 
2. Fuel
The fuel can be producer gas, natural gas, coal bed methane and pulverized coal.
 
Product Quality Index:
The quality index of active lime products has reached the first grade or above specified in the industry standard YB/T042-2004 (see the table below).
 

Grade

Chemical Composition  %

Activity

CaO

MgO

SiO2

P

S

Burn

ml

Special grade

92

≤5.0

1.5

0.02

0.02

2

360

First class

90

2

0.03

0.03

4

340

Our Advantage

1. The combustion equipment uses energy-saving burners to automatically control the air distribution volume to reduce the loss of incomplete fuel combustion.

2. Rotary kiln refractory bricks adopt light-weight insulation on the outer layer and composite bricks with refractory and wear-resistant inner layer to reduce heat dissipation from the outer skin of the rotary kiln.

3. There is a vertical preheater at the end of the rotary kiln, which makes full use of the high-temperature flue gas produced by the combustion of the rotary kiln to preheat the materials in the preheater, so that the materials are partially decomposed in the preheater.

4. A vertical cooler is installed at the head of the rotary kiln to make full use of the heat contained in the high-temperature calcined white material of the rotary kiln to preheat the secondary air to 600°C, which improves the thermal efficiency. Yaotou mining

5. The vertical cooler and the kiln hood are integrated in the design and construction, which has a small footprint and good sealing, which effectively avoids the fugitive emission of hot exhaust gas.

6. The kiln tail is environmentally friendly and dust collection is good. The cyclone dust collector and pulse bag filter are used for secondary dust removal, and the emission concentration is lower than the standard.

7. The level of automation is high. The adjustment, control and alarm of the production system are controlled by PLC in the main control room. There are few on-site operators and high labor efficiency.

Production Technology

We will select the most workable and efficient and economical solution based o the clients' specific requirement and conditions.
 
Energy Saving Rotary Lime Kiln Process
Rotary kiln is one kind of furnace which is widely used for calcined active lime production in the world. It is also widely used in many industries such as construction materials, metallurgy, chemical and environmental protection. The energy-saving rotary lime kiln has the advanced structure and stable operation. It adopts the vertical preheater with low pressure loss  which can  effectively improve  the  preheating effects. The raw materials’  decomposition rate in the  vertical preheater can reach to 30% before entering into the rotary kiln. It is also suitable for different fuels including pulverized solid fuel, liquid fuel and gas fuel. The final lime products have high activity. This kind of rotary kiln already have been widely used in the steel industry and chemical industry.
 
Traditional Rotary Lime Kiln Process
The long rotary lime kiln has the characteristics of simple structure and stable operation. It increases the length of the rotary kiln cylinder to improve the preheating effect, and after preheating, the limestone is entering into the calcination zone for decomposition; The limestone feeding size can be 10 ~20 mm, 20~40 mm. It can use various fuels including pulverized solid fuel, liquid fuel and gas fuel. The final lime or dolime product has relatively higher activity. This kind of rotary kiln is suitable for middle & small production lines, and is suitable for the lime production with limestone with small sizes or lower heat strength.
 
Mixed Burning Vertical Lime Kiln Process
The qualified raw materials and solid fuels are mixed uniformly according to a certain proportion and then sent to the vertical kiln through a single bucket elevator for calcination. After calcination, the final lime products are discharged from the bottom of the vertical kiln through a discharge device to the conveyor, and the conveyor sends the final lime products to the storage silo. The hot flue gas generated by calcination will firstly go into the dust collecting system, and then the clean flue gas will be emitted through chimney to the atmosphere.
 
 
PROCESS FLOW CHART 

Configuration

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

Φ3.8×58m

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

Message

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