Liquid crystal display recycling method

Abstract

The invention relates to a recycling method, in particular to a liquid crystal display recycling method. The method comprises the following steps: two layers of glass substrates are detached by using external force, and the protective films on the surfaces of the glass substrates are torn off manually; the stripped glass substrates are put into a stainless steel ware passivated through concentrated alkaline; a lower layer glass substrate is soaked in a sodium hydroxide solution with the mass percent of 5-20 percent for 60-129 minutes; meanwhile, an upper layer glass substrate containing a chrome black matrix film is soaked for 50-121 minutes; an upper layer glass substrate containing a resin back matrix film is soaked for 27-38 minutes; heating is performed to boiling while stirring is performed, the polaroid removal is observed through naked eyes, and an optical metallographic microscope is used for observing the surfaces of the glass substrates; the lower layer glass substrate, which is not processed cleanly, is soaked in a sodium hydroxide solution with the mass percent of 5-15 percent for 8-31 minutes for removing under normal temperature, and the upper layer glass substrate containing the chrome black matrix film, which is not processed cleanly, is soaked for 49-174 minutes for removing, so that clean glass substrates are obtained. The recycling method provided by the invention is simple in process and low in cost, and the glass substrates can be processed cleanly.

Description

technical field [0001] The invention relates to a recycling method, in particular to a recycling method of a liquid crystal display screen. Background technique [0002] With the increase in the number of scrapped liquid crystal displays (LCDs) and the rapid replacement of LCDs, a large number of waste LCDs will be generated. At the same time, because the LCDs contain mercury, cadmium, chromium, nickel, lead, molybdenum and other toxic and harmful Metals and toxic non-metallic substances such as arsenic, selenium, PBDE and PBB can easily cause serious pollution to the environment. , copper and other substances have significant recycling value, so it is not only necessary to carry out pollution-free treatment of waste LCD screens, but also to recycle useful resources to achieve a harmonious unity of environmental and economic benefits. [0003] At present, Nanjing University uses organic solvents such as acetone, chloroform, benzene, xylene and other organic solvents and ino...

AI Technical Summary

Problems solved by technology

[0003] At present, Nanjing University uses organic solvents such as acetone, chloroform, benzene, and xylene to soak and separate glass substrates such as acetone, chloroform, benzene, and xylene, and inorganic acids such as nitric acid and hydrochloric acid. The effect is poor and time-consuming. Li Jinhui and others use thermal precipitation and ultrasonic cleaning. Disposal of waste LCD screens is costly

[0004] At the same time, Qin Wenlong researched to break open the waste liquid crystal display panel, put it into a closed furnace for treatment, separate the coating oxide and the glass substrate, and clean the glass flakes to be crushed and processed into various building materials. Some people use LCD glass waste to replace Ceramic clay is used to produce ecological bricks, ceramics and glass ceramics. Some people use LCD waste glass to replace part of sand to prepare low-strength concrete materials, and some people add waste glass to cement to make composite cement. not tall