Method for preparing micron-sized zinc metastannate by wet recovery of tin and zinc from electronic waste and method for synthesizing 4-hydroxy-1-indanone

By leaching tin and zinc with glycine under mild acidic conditions and preparing micron-sized zinc metastannate, the resource waste and environmental pollution problems of tin and zinc recovery and indanone synthesis in electronic waste are solved, efficient metal recovery and compound synthesis are achieved, and a high-value utilization system for low-value metals is constructed.

CN120309006BActive Publication Date: 2025-09-30CHANGCHUN GOLD RES INST
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Patent Information

Application Number
CN202510789322.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-13
Publication Date
2025-09-30
Estimated Expiration
2045-06-13

AI Technical Summary

Technical Problem

Existing technologies for recovering tin and zinc from electronic waste and synthesizing indanone suffer from problems such as resource waste, environmental pollution, low recovery rates, and high costs. In particular, traditional methods rely on highly corrosive reagents and precious metal catalysts, resulting in difficulties in selective separation and limited product added value.

Method used

The bifunctional properties of glycine are used to selectively leach tin and zinc under mild acidic conditions, and micron-sized zinc metastannate is prepared by evaporation-crystallization regulation. Its layered structure is used to catalyze the synthesis of indanone, forming a local proton acid environment to activate the C=N bond of the imine substrate, thereby realizing a [4+1] cycloaddition reaction.

Benefits of technology

It achieves highly selective separation and high-value conversion of tin and zinc, reduces dependence on precious metals and the use of organic solvents, improves the recovery rate of tin and zinc and the yield of indanone synthesis, and builds a targeted recovery and high-value utilization system for low-value metals, which is in line with the concept of sustainable development.

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Abstract

The purpose of the present invention is to provide a method for wet recovery of tin and zinc in electronic waste to prepare micron-sized zinc metastannate and a method for synthesizing 4-hydroxy-1-indanone, which belongs to the field of metal recycling technology. The method utilizes amino coordination and carboxylic acid chelation to selectively leach tin and zinc from electronic waste under mild acidic conditions, while impurity metals such as iron and copper are retained in the residue due to differences in complex constants, achieving metal ion-level separation (selectivity>99%). Subsequently, by evaporation-crystallization regulation, the Sn-Zn complex is directionally reconstructed into micron-sized zinc metastannate. In the synthesis of indanone, micron-sized zinc metastannate forms a local proton acid environment by adsorbing trace water in the reaction system, synchronously activating the C=N bond of the imine substrate (Lewis acid site catalysis) and stabilizing the cyclization transition state (hydrogen bond directing effect), reducing the activation energy of the [4+1] cycloaddition reaction, driving the reaction equilibrium to move toward the product end, and achieving quantitative conversion of indanone under mild conditions (yield 60%).
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