Zinc Oxide Rotary Kiln
High-Efficiency Reduction Calcination Kiln for Zinc Ore / Zinc Slag Secondary Zinc Recycling
Zinc Oxide Rotary Kiln is professional high-temperature reduction and oxidation thermal processing equipment dedicated to secondary zinc resource recycling. Different from ordinary sintering and calcination kilns, it adopts exclusive staged reduction volatilization & oxidation molding technology at 850-1100℃. It efficiently processes low-grade zinc ore, zinc slag, steel plant dust and smelting waste residue into high-purity zinc oxide powder, widely used in metallurgy, chemical, rubber and environmental solid waste recycling industries.
High Purity ZnO
Zinc Recycling
Energy-Saving
What is Zinc Oxide Rotary Kiln?
A large amount of low-grade zinc ore and smelting zinc slag is discarded every year, causing serious waste of metal resources and heavy metal environmental pollution. Traditional zinc processing equipment has many defects: unreasonable temperature control leads to incomplete zinc volatilization and low recovery rate; mixed impurities result in low ZnO purity; open production causes flue gas and dust leakage, failing to meet environmental protection standards and restricting enterprise benefits.
Our High-Recovery Zinc Oxide Rotary Kiln is professionally optimized for zinc reduction volatilization and oxidation reaction characteristics. It adopts three-stage staged temperature control of preheating drying, high-temperature reduction volatilization and oxidative crystallization molding. It accurately controls the boiling and volatilization temperature of zinc elements, realizes efficient separation of zinc from waste slag impurities, and produces high-purity and high-activity zinc oxide powder. Equipped with professional dust collection and waste heat recovery system, it achieves high recovery, energy saving and environmentally friendly secondary zinc resource recycling.
Core Structural Composition & Functional Advantages of Zinc Oxide Rotary Kiln
1. Special Anti-Corrosion High-Temp Kiln Body
The kiln cylinder is made of thickened high-strength heat-resistant steel plate, with integral seamless welding structure. Aiming at the corrosive flue gas and high-temperature reduction environment in zinc calcination process, it adopts targeted anti-corrosion and high-temperature resistant treatment, avoiding kiln body corrosion and deformation. It supports long-term 24-hour continuous operation with stable mechanical performance.
2. Wear-Resistant & Anti-Sticking Refractory Lining
The inner wall is paved with customized high-alumina wear-resistant refractory bricks and multi-layer heat insulation lining. It effectively resists material scouring and high-temperature corrosion, prevents zinc material adhesion and kiln ring formation, stabilizes internal temperature field, and ensures full and uniform reduction reaction of zinc materials.
3. Precision Three-Zone Intelligent Temperature Control System
Equipped with independent preheating, reduction and oxidation zone temperature adjustment modules, with core reaction temperature precisely locked at 850-1100℃ and temperature control error within ±5℃. It perfectly matches the zinc volatilization and oxidation reaction curve, thoroughly solving the problems of incomplete zinc volatilization and low recovery rate of traditional equipment.
4. Low-Oxygen Uniform Combustion System
Supports natural gas, coal powder and biomass multi-fuel combustion. The optimized low-oxygen burner forms uniform soft heat radiation, creates a stable reduction atmosphere inside the kiln, avoids excessive oxidation or insufficient reduction of zinc elements, and maximizes zinc volatilization efficiency and product purity.
5. Efficient Waste Heat Recovery & Energy Saving System
High-temperature flue gas and calcination waste heat are fully recycled for raw material preheating and drying. The comprehensive energy-saving rate is over 28%, which greatly reduces unit fuel consumption and production cost. It effectively improves thermal utilization rate and realizes low-carbon zinc recycling production.
6. Fully Enclosed Sealing & Environmental Protection Dust Collection
Kiln head and kiln tail adopt multi-layer flexible fish-scale sealing structure with ultra-low air leakage rate, effectively preventing flue gas leakage. Matched with high-efficiency bag dust removal and zinc oxide special collection system, it realizes zero dust overflow and complete collection of zinc oxide powder, meeting international environmental protection standards and improving finished product yield.
7. Stable Frequency Conversion Transmission System
Adopts high-torque frequency conversion motor and precision reducer, with stepless adjustable rotating speed and material residence time. It can flexibly adapt to different raw materials such as low-grade zinc ore, zinc slag and steel plant dust, accurately adjusting reaction parameters to ensure optimal zinc recovery effect.
Core Product Advantages of Zinc Oxide Rotary Kiln
1. Ultra-High Zinc Recovery Rate & High Purity ZnO
Exclusive staged reduction-oxidation technology realizes full volatilization and oxidation of zinc elements. The zinc recovery rate is as high as 95%+, and the produced zinc oxide powder has high purity, uniform particle size and stable activity. It effectively removes impurities such as iron, manganese and lead in raw materials, fully meeting the high-standard industrial application requirements.
2. Professional Zinc Resource Recycling & Strong Targeted Performance
Different from general mineral calcination kilns, this rotary kiln is specially customized for secondary zinc resource processing. The low-oxygen reduction atmosphere and precise temperature curve are perfectly adapted to zinc volatilization characteristics, solving the industry pain points of low utilization rate of waste zinc materials and difficult impurity separation.
3. Significant Energy-Saving & Low Operating Cost
The closed-loop waste heat recycling system greatly reduces invalid heat loss. The ton material energy consumption is far lower than traditional zinc calcination equipment. Long-term continuous production can save a lot of fuel and power costs, with prominent economic benefits for large-scale zinc slag recycling projects.
4. Wide Raw Material Adaptability & High Resource Value
It can process various low-value zinc-containing materials: low-grade zinc oxide ore, smelting zinc slag, steel plant flue dust, zinc-containing sludge and tailings. It converts waste secondary zinc resources into high-value industrial zinc oxide powder, greatly improving resource utilization rate and creating huge additional economic benefits.
5. Eco-Friendly & Zero Pollution Production
Fully enclosed production and professional flue gas purification system avoid heavy metal dust and harmful gas leakage. It realizes harmless treatment and resource reuse of zinc waste residue, solving the environmental pollution problem of zinc smelting waste and conforming to global green recycling economy policies.
6. Stable Operation & Low Maintenance Rate
Targeted structural optimization for zinc high-temperature reduction working conditions, with strong corrosion resistance, wear resistance and anti-adhesion performance. The vulnerable parts have long service life, simple daily maintenance and low replacement cost, realizing long-term stable and low-cost operation of the production line.
Working Principle & Complete Calcination Process of Zinc Oxide Rotary Kiln
Core Working Principle
The Zinc Oxide Rotary Kiln adopts countercurrent reduction-oxidation staged reaction principle. The inclined rotary cylinder drives mixed materials of zinc slag/zinc ore and reducing coal to roll and advance uniformly from kiln tail to kiln head. High-temperature hot air flows reversely with materials to form a stable low-oxygen reduction temperature field inside the kiln.
Materials complete three core reaction stages in sequence: low-temperature preheating (200-500℃) to remove surface moisture and organic impurities; medium and high-temperature reduction volatilization (850-1000℃) to vaporize zinc elements into zinc vapor; oxidative crystallization (1000-1100℃) to fully oxidize zinc vapor into solid zinc oxide powder. After flue gas purification, dust collection and cooling, high-purity zinc oxide finished products are collected, realizing automatic continuous zinc recycling production.
Standard Zinc Oxide Production Flow
Zinc Slag/Zinc Ore Crushing & Batching → Mixing with Reducing Coal → Granulation & Feeding → Kiln Tail Pre-Drying → Zinc Oxide Rotary Kiln Reduction Calcination → Zinc Oxide Dust Collection & Purification → Cooling & Screening → Finished ZnO Powder Packaging & Storage
Application Scenarios of Zinc Oxide Rotary Kiln
Main Application Fields
Zinc Oxide Rotary Kiln is the core key equipment for secondary zinc resource recycling. It is widely used in harmless treatment and resource reuse of zinc smelting slag, steel plant zinc-containing dust, low-grade zinc oxide ore and industrial zinc sludge. The produced high-purity zinc oxide powder can be used for rubber vulcanization additives, chemical zinc salt raw materials, coating pigments, electronic materials and metallurgical auxiliary materials, with extremely high industrial application value.
Classic Matching Production Line
Zinc Waste Material Crushing & Grinding → Automatic Batching & Coal Mixing → Granulation Molding → Waste Heat Pre-Drying → Zinc Oxide Rotary Kiln Reduction Calcination → Flue Gas Purification & ZnO Dust Collection → Cooling & Fine Screening → Automatic Packaging & Storage
FAQs of Zinc Oxide Rotary Kiln
Q1: What is a zinc oxide rotary kiln used for?
A: Zinc oxide rotary kiln is professional thermal processing equipment for secondary zinc resource recycling. It performs high-temperature reduction volatilization and oxidation calcination on zinc slag, zinc ore and zinc-containing waste residue to produce high-purity zinc oxide powder, widely used in smelting, chemical and environmental protection fields.
Q2: What is the working temperature of zinc oxide rotary kiln?
A: It adopts three-stage zoned temperature control: 200-500℃ for preheating and drying, 850-1000℃ for zinc reduction volatilization, and 1000-1100℃ for zinc oxide oxidation crystallization, ensuring efficient zinc recovery and high-purity product molding.
Q3: What raw materials can the zinc oxide rotary kiln process?
A: It is suitable for various low-value zinc-containing materials, including low-grade zinc oxide ore, zinc smelting slag, steel plant zinc dust, industrial zinc-containing sludge and tailings, realizing full utilization of secondary zinc resources.
Q4: What is the zinc recovery rate of the rotary kiln?
A: Our optimized zinc oxide rotary kiln has a zinc recovery rate of over 95%, which is much higher than traditional zinc processing equipment. It effectively reduces resource waste and maximizes customer economic benefits.
Q5: Is zinc oxide rotary kiln environmentally friendly?
A: Yes. The fully enclosed production and professional flue gas dust removal system realize zero pollutant leakage. It not only solves the environmental pollution problem of zinc waste residue stacking, but also realizes resource recycling, conforming to global green environmental protection standards.
Zinc Oxide Rotary Kiln Of Real Project Cases
Case 1: Smelting Zinc Slag Recycling Project | Indonesia Non-Ferrous Smelting Plant
Project Info: The customer had a large number of zinc smelting slags with low zinc content and difficult utilization. Our Φ3.0×65m zinc oxide rotary kiln was adopted. Through precise staged reduction and oxidation technology, the zinc recovery rate reaches 95.5%. The produced high-purity zinc oxide powder is directly used in local chemical and rubber industries. The supporting waste heat recovery system reduces comprehensive energy consumption by 28%, achieving significant resource recycling and economic benefits.
Case 2: Steel Plant Zinc Dust Recycling Project | Malaysia Steel Factory
Project Info: A large amount of zinc-containing flue dust was stacked for a long time, causing resource waste and environmental pollution. Our professional zinc oxide rotary kiln perfectly processes steel plant zinc dust. The low-oxygen reduction environment ensures full zinc volatilization, and the fully enclosed dust collection system realizes complete collection of zinc oxide products. The project realizes harmless disposal and resource reuse of industrial waste, meeting local environmental protection emission standards.
Case 3: Low-Grade Zinc Ore Calcination Project | Zambia Mineral Processing Base
Project Info: The customer has abundant low-grade zinc oxide ore resources, with low single ore utilization value. Our high-efficiency zinc oxide rotary kiln upgrades low-grade zinc ore into high-value industrial zinc oxide powder. The equipment supports 24-hour continuous stable production with large output and low failure rate, greatly improving the economic value of local mineral resources and promoting local mineral processing industry development.
Technical Parameters of Zinc Oxide Rotary Kiln
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Item
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Specification
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Machine Model
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Φ2.0×45 / Φ2.5×55 / Φ3.0×65 / Φ3.2×70m Customizable
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Processing Capacity
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100 – 900 TPD Zinc-containing Raw Materials
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Reaction Temperature Range
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Preheating: 200-500℃; Reduction: 850-1000℃; Oxidation: 1000-1100℃
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Kiln Inclination
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1.5% – 3.5% Adjustable
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Rotating Speed
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0.3 – 3.5 r/min Stepless frequency conversion adjustment
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Applicable Raw Materials
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Low-grade zinc ore, zinc smelting slag, steel plant zinc dust, zinc-containing sludge, tailings
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Applicable Fuel
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Natural gas, coal powder, biomass, diesel
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Zinc Recovery Rate
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≥95% High recovery efficiency
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Finished ZnO Purity
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High purity, uniform particle size, stable chemical activity
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Thermal Efficiency
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≥89% With full waste heat recovery system
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Core Function
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Zinc material drying, high-temperature reduction volatilization, zinc oxide oxidation & collection
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Applicable Industry
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Non-ferrous metal smelting, solid waste recycling, chemical industry, rubber additives, environmental protection engineering
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Core Features
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High recovery rate, high purity finished product, energy-saving, low pollution, wide raw material adaptability
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Get Custom Zinc Oxide Rotary Kiln Solution
Our Zinc Oxide Rotary Kiln adopts exclusive staged reduction-oxidation calcination technology, specially customized for secondary zinc resource recycling. With core advantages of ultra-high zinc recovery rate, high-purity finished zinc oxide, significant energy-saving effect, wide raw material adaptability and eco-friendly production, it provides reliable core equipment support for global non-ferrous metal recycling and environmental protection projects, helping customers maximize resource utilization and economic benefits.
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