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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
	≥	MgO	≤			≤	≥
Special grade	92	≤5.0	1.5	0.02	0.02	2	360
First class	90	≤5.0	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.

Lime Rotary Kiln

Veritcal Preheater

Lime Vertical Kiln

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