Online Oxygen Content Monitoring Scheme for Lithium‑Battery Crushing and Recycling Processes | Application Analysis of Zirconia Oxygen Analyzers by Anhui Tianfen Instruments
I. Industry Background: In lithium‑battery crushing and recycling, controlling oxygen levels is critical for ensuring safe production and improving quality while boosting efficiency.
As the volume of retired new‑energy power batteries continues to rise year after year, the crushing and recycling, pyrolytic roasting, and resource‑recovery processes for spent lithium batteries have become core links in the lithium‑battery circular‑economy value chain. The lithium‑battery crushing and recycling process comprises multiple stages, including battery disassembly, mechanical crushing, powder sorting, high‑temperature pyrolysis, flue‑gas incineration, and hydrometallurgical leaching. The entire production line operates under harsh conditions characterized by flammability and explosiveness, dust‑induced corrosion, high temperature and humidity, and complex exhaust gases.

Waste lithium batteries contain residual electrolyte, reactive lithium, graphite anodes, and ternary or lithium‑iron‑phosphate cathode materials; during the crushing process, friction between these materials can easily generate sparks. In the pyrolysis stage, if the oxygen level inside the reactor exceeds the permissible threshold, it can trigger vigorous evaporation of the electrolyte and oxidation of reactive metals. This may, at best, lead to excessive oxidation of valuable metals such as cobalt, nickel, and lithium, thereby reducing leaching recovery rates; at worst, it can result in furnace deflagration and serious safety incidents. Furthermore, imbalances in oxygen levels during the exhaust gas incineration phase can cause emissions of pollutants—including dioxins and NOx—to exceed regulatory limits, exposing operations to significant environmental compliance risks.
Therefore, equipping lithium‑battery crushing and recycling production lines with zirconia oxygen analyzers to enable real‑time, online monitoring of oxygen levels in the furnace chamber, pyrolysis furnace, flue gas duct, and inert‑gas protection zone is an essential piece of equipment for companies seeking to ensure safe production, improve metal recovery rates, and meet environmental emission standards. Anhui Tianfen Instrument Co., Ltd., with many years of expertise in industrial gas detection, specializes in manufacturing zirconia oxygen analyzers. Tailored to the high‑temperature, dusty, corrosive, and explosion‑proof requirements of the lithium‑battery crushing and recycling industry, the company has developed the TFZO series of zirconia oxygen analyzers, providing lithium‑battery recycling enterprises with a stable, accurate, and low‑maintenance online oxygen‑measurement solution.
II. Analysis of Pain Points in Oxygen Content Monitoring Across Each Process Step in Lithium-Battery Shredding and Recycling
Pain points in safety management for the crushing and sorting process
When lithium batteries containing residual charge or residual electricity are crushed, the crushing chamber and the material‑handling conveyor system must be protected with an inert nitrogen atmosphere. If oxygen ingress exceeds the permissible threshold, the reactive lithium powder can readily ignite upon contact with oxygen. Conventional portable oxygen detectors can only perform intermittent spot checks, failing to provide real-time warnings and posing a significant safety hazard.
Pain points in atmosphere control for high-temperature pyrolysis rotary kilns
The pyrolysis kiln requires strict control of the oxygen content within the furnace to below 1% in order to prevent oxidation of copper foil, aluminum foil, and cathode powder, thereby ensuring high recovery rates in subsequent hydrometallurgical processes for lithium, nickel, and cobalt. The kiln temperature can reach several hundred degrees Celsius, and the flue gas contains significant amounts of fluorides and particulate matter. Conventional oxygen sensors, however, exhibit poor high‑temperature resistance, are prone to corrosion, and drift rapidly, leading to inaccurate measurement data.
Pain points in optimizing combustion for exhaust gas incinerators
Incinerators decompose pyrolysis off-gases, VOCs, and fluorine‑containing flue gases. If the oxygen content is too low, combustion becomes incomplete, increasing the risk of dioxin formation; if it is too high, fuel energy is wasted and NOx emissions rise. Therefore, a zirconia oxygen analyzer is required to provide real-time oxygen concentration feedback, enabling coordinated damper control to adjust the air–fuel ratio.
The shortcomings of traditional monitoring equipment are particularly pronounced.
Extractive oxygen analyzers require complex pretreatment systems, are prone to clogging, demand labor‑intensive maintenance, and suffer from sluggish response times. Meanwhile, imported zirconia oxygen analyzers are expensive to procure, have long lead times for spare parts, and offer slow after‑sales support, placing significant operational and maintenance burdens on many small and medium‑sized lithium‑battery recycling enterprises. There is an urgent need for a cost‑effective, high‑performance, domestically produced zirconia oxygen analyzer to replace imported counterparts.
III. Core Advantages of the Anhui Tianfen Instrument Zirconia Oxygen Analyzer in Supporting Lithium‑Battery Crushing and Recycling Processes
Anhui Tianfen Instrument independently researches, develops, and manufactures the TFYHG series zirconia oxygen analyzers. Based on the principle of the zirconia solid electrolyte oxygen concentration cell, these instruments enable in-situ, direct‑plug‑in online measurement of oxygen levels in flue gas and furnace atmospheres, without requiring complex sample‑gas pretreatment. They have been specially engineered with optimized structures and materials to meet the demanding operating conditions of lithium‑battery crushing and recycling. The product’s key advantages are as follows:
1. Precise measurement and rapid response, suitable for dynamic process control.
The Zirconia Oxygen Analyzer features a measurement range of 0.01% to 25%, is programmable, and delivers high measurement accuracy. With a T90 response time of ≤5 seconds, it can capture real-time fluctuations in oxygen levels within pyrolysis kilns and incinerators. It provides both a 4–20 mA analog output and an RS485 Modbus communication interface, enabling direct integration with production‑line PLC/DCS systems. The instrument automatically coordinates nitrogen purging, fan damper adjustments, and gas valve control, precisely maintaining the desired oxygen concentration within the furnace. This prevents oxidation‑related losses of metal powders while optimizing combustion efficiency and reducing fuel consumption. Temperature control accuracy reaches ±1°C, and long‑term operation exhibits minimal oxygen potential drift, ensuring stable and reliable continuous production data around the clock.
2. High-temperature and corrosion resistance, capable of withstanding the harsh operating conditions of lithium‑battery recycling.
The probe can be made from corrosion‑resistant materials such as 316L, 310S, or Hastelloy, with an enhanced anti‑corrosion coating specifically designed to handle lithium‑battery exhaust gases containing HF and other highly acidic fumes. A flow‑diverting design is available, preventing direct exposure of the zirconia sensor to flue gas and significantly reducing erosion by particulates and corrosive gases. The probe is rated for continuous operation in temperatures up to 1200°C, making it well suited for installation in rotary kilns and high‑temperature incineration ducts. With an IP65 protection rating, it offers dust‑tight and water‑resistant performance, ensuring reliable operation even in workshop environments characterized by high dust levels and elevated humidity, while minimizing the risk of ash buildup and blockage.
3. Explosion-proof designs are available, ensuring a robust safety barrier in the crushing process.
For the flammable and explosive environment of lithium‑battery crushing workshops, Tianfen can supply explosion‑proof zirconia oxygen analyzers that have obtained the relevant explosion‑proof certifications. These instruments can be installed in hazardous areas such as crushing chambers, powder‑conveying hoppers, and nitrogen‑purged enclosures. When oxygen levels exceed the set threshold, they trigger an immediate audible and visual alarm and automatically initiate nitrogen‑injection purging, effectively nipping the risk of spontaneous combustion or explosion during the crushing process in the bud. This helps companies comply with safety production standards and meet regulatory inspection requirements.
4. Easy to maintain, long service life, and capable of serving as a high-end replacement for imported products.
The Tianfen zirconia oxygen analyzer features no moving mechanical parts, eliminating the need for a reference pump or carrier gas and requiring minimal routine maintenance. Its sensor employs an ion‑plating process, delivering excellent oxidation resistance and ensuring a probe lifespan of 5 to 10 years. With highly compatible components, it offers lower procurement costs, convenient after‑sales service, and short lead times for spare parts compared with imported zirconia oxygen analyzers, providing an ideal high‑end alternative to foreign brands and significantly reducing equipment acquisition and operational‑maintenance expenses for lithium‑battery recycling companies. It supports both semi‑automatic and fully automatic calibration, enabling straightforward on‑site adjustment and minimizing downtime.
5. Strong capabilities in customized services, adaptable to a wide range of production line upgrade requirements.
Customization is available to meet specific requirements, including flue diameter, insertion depth (600 mm, 800 mm, 1,000 mm, 1,200 mm, or non‑standard custom options), mounting flange specifications, output signal type, and special trace‑oxygen measurement needs. A variety of configurations—split‑type and integrated‑type—are offered, ensuring rapid installation compatibility whether for new lithium‑battery crushing and recycling lines or for upgrading and retrofitting existing equipment. Engineers provide end‑to‑end services, including on‑site selection guidance, installation and commissioning, and technical training.
IV. Specific Application Points of the Zirconia Oxygen Analyzer in Lithium-Battery Crushing and Recycling Processes
Nitrogen‑protected chamber for crushing and powder storage: Monitors the oxygen level in enclosed crushing equipment and temporary powder storage bins; when oxygen levels exceed the threshold, an alarm triggers automatic nitrogen injection to prevent lithium powder from spontaneously igniting.
High-temperature pyrolysis rotary kiln furnace: On-line monitoring of oxygen concentration in the kiln atmosphere, with stable control at a low-oxygen environment, thereby reducing oxidation of cathode and anode materials and improving the recovery rates of lithium, nickel, cobalt, and manganese.
Pyrolysis off-gas incinerator flue: Real-time monitoring of oxygen content in the incineration outlet flue gas optimizes the air‑fuel ratio, reduces the formation of dioxins and nitrogen oxides, and helps ensure compliance with emission standards.
Flue gas monitoring point prior to alkali scrubbing and activated carbon adsorption: provides a precise basis for converting oxygen content in environmental emission data, thereby meeting the requirements for reporting online environmental monitoring data.
V. Summary
As the lithium‑battery crushing and recycling industry experiences rapid growth, three critical imperatives—production safety, resource recovery rates, and environmental compliance—are indispensable. Among these, precise and reliable online oxygen‑content monitoring is an essential link in the entire process chain. Anhui Tianfen Instrument Co., Ltd. has been dedicated for many years to the R&D and manufacturing of zirconia oxygen analyzers. Backed by superior product quality, the ability to customize solutions tailored to the unique operating conditions of lithium‑battery recycling, and comprehensive after‑sales technical support, the company offers lithium‑battery crushing and recycling enterprises highly stable, cost‑effective zirconia oxygen analyzers that can replace imported models. These products help businesses achieve safe, controllable production, reduce operational energy consumption, enhance the economic returns from valuable metal recovery, and meet stringent environmental regulatory requirements.
If you are seeking a reliable online oxygen‑measurement device for your lithium‑battery crushing and recycling production line, or if you wish to replace your existing imported zirconia oxygen analyzers with domestically produced alternatives due to high costs and difficult maintenance, please contact Anhui Tianfen Instrumentation for consultation and equipment selection. We can tailor a customized oxygen‑content monitoring solution based on your specific on‑site operating conditions.