Rotary Kiln

High quality zinc oxide rotary kiln manufacturer

Zinc oxide incineration kiln is a kind of equipment specially used for producing zinc oxide (ZnO) or more precisely, a kind of ZnO refining equipment. The main process is to extract the residual Zn from the steel plant slag through high temperature calcination and form zinc oxide during the incineration process. The gasified zinc oxide is then settled and collected through the liquid settling chamber. The collected zinc oxide is an important chemical raw material, which can be used in rubber, glass, ceramics, coatings and other industries, and has a high economic value.

tongli heavy machinery zinc oxide rotary kiln main picture

TONGLI Zinc Oxide Incineration Kiln

A MACHINE YOU CAN DEPEND ON!

Tongli's zinc oxide rotary kiln has successful cases in many well-known companies at home and abroad. The high-efficiency combustion system optimizes fuel utilization and achieves complete control of the combustion process, ensuring high output and high quality of zinc oxide production. The liquid dust reduction and collection system effectively reduces dust emissions during the production process and greatly improves the recovery rate of zinc oxide, making the raw material utilization rate higher.

Intelligent Control System

The zinc oxide rotary kiln is equipped with an advanced intelligent control system to monitor the temperature, airflow and pressure in the kiln in real time to ensure stability and efficiency during the production process. The system can reduce operating errors by 50%, increase production efficiency by 30%, and effectively reduce equipment maintenance costs, extending the service life of the rotary kiln.

Efficient Combustion System

Tongli's zinc oxide rotary kiln is equipped with an efficient combustion system and a sealing system to ensure full recovery of zinc oxide and improved production efficiency. The optimized design of the combustion system can increase fuel utilization by more than 20%, save 10% to 15% of energy for each ton of raw materials processed, reduce production costs, and also reduce carbon emissions, which is more environmentally friendly.

Dust Reduction and Collection System

Tongli's zinc oxide rotary kiln adopts a liquid dust reduction and collection system to effectively control dust pollution generated during the production process, so that the recovery rate of zinc oxide reaches more than 95%. The system can also reduce particulate matter emissions during the production process by 80%, meet strict international environmental standards, and ensure the cleanliness and safety of the plant environment.

xxxxxxxCapacity (t/h)Motor Model:Gearbox ModelInput Moisture (%)Fuel Coal Calorific Value (kcal)Output Moisture (%)
φ1.2x102.5-3M160M-6 → 7.5ZQ350Ⅱ-2525±5≥5500≤13
φ1.5x147-9Y180L-6 → 15ZQ400Ⅱ-31.525±5≥5500≤13
φ1.5x189.5-12Y180L-6 → 15ZQ400Ⅱ-31.527±5≥5500≤13
φ1.8x1412-15Y200L-6 → 18.5ZQ400Ⅱ-31.525±5≥5500≤13
φ1.8x1814-18Y200L1-6 → 18.5ZQ400Ⅱ-31.527±5≥5500≤13
φ2.0x1818-22Y200L2-6 → 22ZQ50Ⅱ-31.525±5≥5500≤13
φ2.0x2018-23Y200L2-6 → 22ZQ50Ⅱ-31.530±5≥5500≤13
φ2.2x1821-25Y200L2-6 → 22ZQ65Ⅱ-31.527±5≥5500≤13
φ2.2x2022-25Y225M-6 → 30ZQ65Ⅱ-31.530±5≥5500≤13
φ2.4x2025-29Y225M-6 → 30ZQ75Ⅱ-31.527±5≥5500≤13
φ2.4x2226-30Y225M-6 → 30ZQ75Ⅱ-31.530±5≥5500≤13
φ2.6x2028-33Y250M-6 → 37ZQ85Ⅱ-31.525±5≥5500≤13
φ2.6x2429-35Y250M-6 → 37ZQ85Ⅱ-31.530±5≥5500≤13
φ3.0x2045-50Y280S-6 → 45ZQ100Ⅱ-31.525±5≥5500≤13


FAQ

1. What is the process flow of refining zinc oxide in a rotary kiln?

1. Raw material pretreatment Steel slag is usually crushed and screened first, and large pieces of steel slag are crushed into small particles suitable for rotary kiln processing, while removing impurities that do not contain zinc.

2. Batching and mixing: The pretreated steel slag is mixed with a certain proportion of flux to promote the volatilization of zinc at high temperature. Commonly used fluxes include limestone and coke, which can improve the extraction efficiency of zinc in steel slag.

3. Rotary kiln calcination: The mixture is sent to the rotary kiln for high-temperature calcination. The rotary kiln usually operates at a temperature between 1100°C and 1300°C. At this high temperature, the zinc in the steel slag volatilizes in the form of zinc oxide gas and enters the next step of treatment with the flue gas.

4. Flue gas treatment and cooling: The zinc-containing flue gas is cooled to a low temperature by a cooling device, so that the gaseous zinc oxide condenses into solid particles. This process is usually accompanied by an efficient gas filtration system to ensure the effective collection of zinc oxide particles and control the exhaust gas emissions to meet environmental protection standards.

5. Zinc oxide powder collection: The cooled zinc oxide powder is collected by a bag filter or other solid gas separation device to finally obtain a zinc oxide product with high purity. The zinc oxide product can be used in many fields such as metallurgy, chemical industry, and ceramics.

6. Waste slag treatment: The residual steel slag after calcination in the rotary kiln can be reused as building materials, road filling materials, etc. to achieve further resource utilization of waste.

2. What are the main functions of zinc oxide?


As an important vulcanization activator and reinforcing agent in the rubber industry, zinc oxide can improve the elasticity, wear resistance and aging resistance of rubber products. Secondly, it is an important pigment in the coating industry, which can provide excellent hiding power and UV resistance, so it is often used in anti-corrosion coatings and exterior wall coatings.

In addition, zinc oxide is used as a flux in the ceramic and glass industries to improve the transparency and gloss of the product. In the medical field, zinc oxide is widely used in the production of ointments, toothpastes and antibacterial agents due to its antibacterial and astringent properties.

Also, zinc oxide is also a key material in the electronics industry, especially in the production of piezoelectric materials, optoelectronic materials and semiconductor components. In addition, zinc oxide is also used in feed additives to help supplement the trace element zinc in animals. Zinc oxide has become an indispensable material in many fields due to its versatility and wide range of uses

3. What are the physical and chemical properties of zinc oxide?

In terms of physical properties, pure zinc oxide is usually white crystalline powder or colorless crystals, has high heat resistance, has a melting point of 1975°C, and a density of about 5.61 g/cm³. Zinc oxide is insoluble in water, but soluble in acids and alkalis to form corresponding zinc salts or zincates.

Also, zinc oxide also has good optical properties and can effectively absorb ultraviolet rays, so it is often used in sunscreen products. In terms of chemical properties, zinc oxide is chemically stable at room temperature and does not react with oxygen or nitrogen in the air. As an amphoteric oxide, zinc oxide can react with acids and bases, such as reacting with hydrochloric acid to form zinc chloride, or reacting with sodium hydroxide to form sodium zincate.

In addition, under high temperature conditions, zinc oxide can undergo a reduction reaction with carbon or hydrogen to generate metallic zinc. Zinc oxide also has semiconductor properties and can produce electron-hole pairs under ultraviolet light, showing photocatalytic activity and can be used to degrade pollutants.
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4. How to choose the size and specifications of the zinc oxide rotary kiln?

Production capacity: Determine the specifications of the rotary kiln according to the zinc oxide output of the target market. Generally, the diameter and length of the rotary kiln will directly affect the production capacity. Tongli recommends choosing the appropriate kiln size based on the actual production needs of the enterprise and future expansion plans.

Raw material characteristics: The particle size, moisture content, material density, etc. of the zinc oxide raw material steel slag will also affect the size selection of the rotary kiln. If the raw material is fine or has a high moisture content, a longer rotary kiln needs to be selected so that there is enough time for drying and calcining.

Thermal efficiency requirements: The size of the kiln is closely related to thermal efficiency. A longer rotary kiln can provide a longer residence time during the material calcination process and improve thermal efficiency. For zinc oxide production, uniform temperature control is crucial, so the diameter and length of the kiln should be considered to meet the requirements of thermal efficiency.

Fuel type: Different fuels will also affect the design of the rotary kiln, and have different effects on the temperature and heat distribution in the kiln.

Environmental protection requirements: According to local environmental protection requirements, such as the emission requirements of 30 mg per cubic centimeter, the corresponding exhaust gas treatment system configuration is designed to ensure compliance with emission standards.

5. Energy-saving transformation plan for zinc oxide rotary kiln?

The energy-saving transformation methods of zinc oxide rotary kiln mainly focus on thermal energy utilization and equipment optimization.

First, the heat energy in the exhaust gas can be recovered by installing a waste heat recovery system to achieve secondary utilization of heat energy and increase thermal efficiency by up to 10%-15%. Secondly, optimizing the kiln structure, such as using composite refractory bricks or lightweight insulation materials, can reduce kiln heat loss and save fuel consumption by 5%-8%.

In addition, the introduction of an intelligent control system can reduce energy consumption by about 10% by real-time monitoring of the temperature and fuel consumption in the kiln and adjusting the fuel supply and air flow of the burner. Through these energy-saving measures, the overall energy efficiency of the zinc oxide rotary kiln can be improved by 15%-20%, significantly reducing production costs.

6. Common faults and solutions of zinc oxide rotary kiln?

During the operation of zinc oxide rotary kiln, common faults include kiln body deformation, kiln lining shedding, transmission system failure and other problems. For example, during the high-temperature calcination stage, the kiln body is easily deformed due to thermal expansion, resulting in unstable operation.

To solve this problem, the support wheel and the retaining wheel should be checked and adjusted regularly to ensure the stability of the kiln body. Kiln lining shedding may be caused by poor quality of lining bricks or improper construction. It is recommended to use high-quality refractory materials and strictly follow the installation specifications for construction.

If the transmission system has abnormal vibration or noise, it is necessary to check the gear meshing and bearing lubrication, and replace the worn parts in time. Through regular maintenance and early diagnosis, these common faults can be effectively prevented and solved to ensure the stable operation of the rotary kiln.

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