Rapid method for destroying structure of cathode-ray tube phosphor waste material

Abstract

The invention belongs to the technical field of rare earth resource recovery, and especially relates to a rapid method for destroying a structure of a cathode-ray tube phosphor waste material. The method is as below: carrying out machinery activation on the cathode-ray tube phosphor waste material through a bowl mill under wet grinding condition to obtain an activated cathode-ray tube phosphor waste material; fully drying the activated cathode-ray tube phosphor waste material; mixing the waste material with a certain amount of an alkali metal compound; and conducting a one-step high temperature liquid-solid reaction on the mixture in a tubular furnace, so as to obtain the cathode-ray tube phosphor waste material, which has structure thoroughly destroyed and can be dissolved in dilute hydrochloric acid. The method provided by the invention has fast and short treatment process, low cost, high utilization rate of resource, and can rapidly destroy the structure of the cathode-ray tube phosphor waste material in 3-10 min; and in a subsequent process, dilute hydrochloric acid can be used efficiently and directly to leach rare earth elements, thereby effectively preventing secondary environmental pollution caused by H2S produced in direct leaching by strong acid.

Description

technical field [0001] The invention belongs to the technical field of rare earth resource recovery and utilization, in particular to a method for rapidly destroying the phosphor powder waste structure of a cathode ray tube. Background technique [0002] With the development of the times, cathode ray tube displays are gradually replaced by emerging liquid crystal displays, causing a large number of cathode ray tubes to enter the scrapping stage. According to statistics, in 2012 alone, the number of scrapped cathode ray tubes in my country exceeded 50 million units. Compared with 2005, the average annual growth rate has exceeded 10%, and a cathode ray tube contains about 15g of phosphor, of which the content of rare earth elements accounts for more than 20% of the mass of cathode ray tube phosphor, so that the waste produced in 2012 only The number of rare earths reached 150 tons, which shows that the development space and potential for the recycling and utilization of rare ear...

AI Technical Summary

Problems solved by technology

At present, the preliminary research process for the treatment of cathode ray tube phosphor waste in China is usually direct strong acid leaching or high temperature calcination followed by enhanced acid oxidation leaching. Neither of these two methods can fully destroy the structure of cathode ray tube phosphor waste in a short period of time. In the whole process, the calcination time is as long as several hours, the leaching time is long, and the process is complicated. The introduction of strong acid causes rapid corrosion of equipment and high risk of personnel operation. At the same time, because the main component of a large number of cathode ray tube phosphor waste on the market is sulfur oxidation For yttrium (europium) and zinc sulfide, if the acid leaching is directly enhanced without the original structure being destroyed, a large amount of H will be produced 2 S gas, causing serious secondary pollution to the environment

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