1. The harmlessness and resource utilization technology for the waste cathode ray tube display screen cone glass employs wet metallurgical techniques to convert the lead in the cone glass into high-value chemical products such as lead sulfate. This process does not generate secondary pollution, and the entire cycle can be closed with waste liquid recycling. Compared to pyrometallurgical lead extraction technology, it is cost-effective, simple to implement, and has a higher product added value. 2. The key technologies for the harmlessness and resource utilization of waste liquid crystal displays are based on the significant characteristics of high-temperature and high-pressure water, which have led to the development of hydrothermal oxidation technology for waste liquid crystals and the production of acetic acid from polarizers through hydrothermal conversion processes. 3. The key technology for the resource utilization of waste printed circuit boards (PCBs) leverages the notable density difference between metals and non-metals and the characteristic of solid fluidization. It involves the development of a solid fluidized gas conveying separation enrichment device and process that can efficiently separate and enrich metals from non-metals within the PCBs without any pollution emissions during the entire process. After separation, the main metal copper has a high recovery rate of up to 96%, and the total metal recovery rate reaches up to 95%. 4. Comprehensive treatment process for waste lithium batteries: For failed lithium cobaltate, based on the ultrasonic cavitation effect, which can provide transient local high temperature, high pressure strong action, and hydroxyl radicals with strong oxidizing ability for chemical reactions, a one-step impurity removal and repair study is conducted on failed lithium cobaltate in an ultrasonic cavitation environment under ultrasonic action. The first discharge specific capacity of the repaired lithium cobaltate reaches 130 mAh/g, and the first charge-discharge efficiency is above 98%. Application situation or application prospects: This project focuses on the toxic, harmful, and valuable material components in waste household appliances. By utilizing the differences between the physicochemical properties of these components, mechanical physical methods are used to crush, dissociate, and separate them for enrichment. Hydrothermal technology, pyrolysis technology, Ultrasonic cavitation technology and other methods are used to achieve the harmless treatment and high-value enrichment of separated components.