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Method of recovering tin from liquid crystal containing indium concentrate

A liquid crystal and ore concentrate technology, applied in the direction of improving process efficiency, can solve the problems of increased COD treatment pressure and increased environmental protection costs, and achieve the effects of complete metal recovery, small equipment investment, and low cost

Inactive Publication Date: 2017-02-15
YANGZHOU NINGDA NOBLE METAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the gas decomposing liquid crystals during roasting needs leaching and tail gas treatment and absorption devices due to insufficient partial oxidation, which increases environmental protection costs. The second is that the recovery of indium needs to go through the extraction process, and the treatment pressure of COD in sewage increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Raw materials for processing: the concentrate containing liquid crystal indium after physical enrichment of waste liquid crystal display screens, after testing, the mass percentage of indium contained in it is 4-6%.

[0028] The operation steps include: low-temperature drying, ball milling, roasting with alkali, leaching with water, pressure filtration, tin extraction, and casting.

[0029] 1. Low-temperature drying: The liquid crystal indium-containing concentrate is dried in an electric drying oven at a controlled temperature of 80-90°C for 4-6 hours to obtain a dried material with a water content of less than 2%.

[0030] 2. Ball milling: Dry the dried material with a ball mill, and sieve it through a 150-mesh screen to obtain liquid crystal indium-containing concentrate powder.

[0031] 3. Alkali roasting: Mix liquid crystal indium-containing concentrate powder and granular caustic soda at a weight ratio of 1:0.8~0.9, stir evenly, put it into a stainless steel tray,...

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PUM

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Abstract

The invention discloses a method of recovering tin from a liquid crystal containing indium concentrate and belongs to the technical field of resource regeneration. The method comprises the following steps: low-temperature drying, ball milling, alkaline calcination, leaching with water, pressure filtering, tin extraction, melt casting and the like. The method has the advantages of high direct recovery rate of tin, simpleness in process operation, small equipment investment, low production cost, non secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of resource regeneration, in particular to the recovery technology of metallic tin in liquid crystal indium-containing concentrate physically enriched in waste liquid crystal display screens. Background technique [0002] Liquid crystal display (LCD) has developed rapidly since the 1990s and has gradually matured. Due to its advantages such as high definition, good image color, environmental protection, power saving, thinness and portability, it has been widely used in household appliances, in computer and communication products. [0003] Most of the current liquid crystal displays use epoxy resin to seal two glass substrates engraved with indium electrodes. After injecting liquid crystals, polarizers are pressed on the outside of the two glass substrates to form a complete liquid crystal display device. Therefore, the key to recycling and processing waste liquid crystal screens is how to effectively separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06C22B25/02C22B1/02C22B7/00
CPCC22B1/02C22B7/001C22B7/006C22B25/02C22B25/04C22B25/06Y02P10/20
Inventor 汪洋樊红杰岳喜龙朱炳龙许振明樊飞
Owner YANGZHOU NINGDA NOBLE METAL CO LTD