Method for recovering indium from waste liquid crystal display screen panel

Abstract

The invention belongs to the technical field of indium recovering and particularly relates to a method for recovering indium from a waste liquid crystal display screen panel. The method aims at solving the technical problems that an existing recovering method is low in recovering rate and high in production cost. According to the scheme, the method for recovering the indium from the waste liquid crystal display screen panel is provided for solving the technical problems mentioned above and includes the following steps that firstly, the waste liquid crystal display screen panel is torn up into fragments, wherein the maximum distance between any two points of each fragment ranges from 4 centimeters to 30 centimeters; secondly, the fragments are soaked in a sulfuric acid solution and filtered, and a leaching agent is obtained; thirdly, the leaching agent is treated through an extraction process and a back extraction process, and a solution containing the indium is obtained; and fourthly, alkaline liquor is added to the solution containing the indium, the pH of the solution is adjusted to be 3 to 6, a solid is filtered out, and after the solid is washed and dried, indium hydroxide is obtained. The method is high in operability, low in operation cost and suitable for large-scale industrial application for enterprises.

Description

technical field

[0001] The invention belongs to the technical field of recycling indium, and in particular relates to a method for recycling indium from waste liquid crystal display panels. Background technique

[0002] Indium is a scarce and precious metal, softer than lead, with good plasticity and ductility, and can be deformed almost arbitrarily. It is widely used in high-performance engine bearings, low-melting alloys, semiconductor materials, and nuclear reactor control rods. At present, indium products are mainly used in the LCD manufacturing industry, and more than 60% of indium is used to make ITO targets. With the vigorous development of liquid crystal display technology, the manufacture of liquid crystal display devices continues to increase, and the waste liquid crystal display devices also increase. The total amount of indium resources in waste liquid crystal display devices is considerable. However, the reserves of indium are only 1 / 6 of gold reserves, and the...

Examples

Embodiment 1

[0041] Use a biaxial shear tearing machine to tear up the waste liquid crystal display panels, then put 18kg of liquid crystal display panel fragments into 50L of 1mol / L sulfuric acid solution, heat, stir and soak for 20h. Take out the fragments, wash them with 50L of water, then add 200g of concentrated sulfuric acid and 18kg of liquid crystal panel fragments to the sulfuric acid solution to continue soaking. After soaking 10 batches of liquid crystal fragments according to the above operation, filter and collect the leachate.

[0042] The extractant was prepared with p204 and sulfonated kerosene in a volume ratio of 4:6, and the extraction was carried out three times under the condition that the volume ratio of water to organic phase was 5:1 using a box-type mixing and settling tank. Stand still, the raffinate obtained, skim the upper organic phase, add 200g of concentrated sulfuric acid, continue to soak the new broken screen. Using a mixing and settling tank, use 1mol / L su...

technical field

[0001] The invention belongs to the technical field of recycling indium, and in particular relates to a method for recycling indium from waste liquid crystal display panels. Background technique

[0002] Indium is a scarce and precious metal, softer than lead, with good plasticity and ductility, and can be deformed almost arbitrarily. It is widely used in high-performance engine bearings, low-melting alloys, semiconductor materials, and nuclear reactor control rods. At present, indium products are mainly used in the LCD manufacturing industry, and more than 60% of indium is used to make ITO targets. With the vigorous development of liquid crystal display technology, the manufacture of liquid crystal display devices continues to increase, and the waste liquid crystal display devices also increase. The total amount of indium resources in waste liquid crystal display devices is considerable. However, the reserves of indium are only 1 / 6 of gold reserves, and the...

Examples

Embodiment 1

[0041] Use a biaxial shear tearing machine to tear up the waste liquid crystal display panels, then put 18kg of liquid crystal display panel fragments into 50L of 1mol / L sulfuric acid solution, heat, stir and soak for 20h. Take out the fragments, wash them with 50L of water, then add 200g of concentrated sulfuric acid and 18kg of liquid crystal panel fragments to the sulfuric acid solution to continue soaking. After soaking 10 batches of liquid crystal fragments according to the above operation, filter and collect the leachate.

[0042] The extractant was prepared with p204 and sulfonated kerosene in a volume ratio of 4:6, and the extraction was carried out three times under the condition that the volume ratio of water to organic phase was 5:1 using a box-type mixing and settling tank. Stand still, the raffinate obtained, skim the upper organic phase, add 200g of concentrated sulfuric acid, continue to soak the new broken screen. Using a mixing and settling tank, use 1mol / L su...