One-step method for preparing nano-tin sulfide from tin-containing electronic waste

An electronic waste, stannous sulfide technology, applied in chemical instruments and methods, tin compounds, nanotechnology, etc., can solve the problems of harsh preparation conditions, coarse particle size, low yield, etc., and achieve the effect of efficient and selective separation

Active Publication Date: 2021-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing methods have problems such as low yield, harsh preparation conditions, and difficulty in large-scale production.
However, the stannous sulfide prepared by the traditional gas phase method has low purity, contains a large amount of tin oxide, tin sulfide and other impurities, and the prepared products are all above 100 microns in size, with coarse particle size and low economic added value.

Method used

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  • One-step method for preparing nano-tin sulfide from tin-containing electronic waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Using tin-containing electronic waste pyrolysis slag as raw material (tin content 9.2%, organic content 0.5%), add composite additives according to the amount of Sn / S=2.0 (composite additives are a mixture of calcium sulfide and silicon dioxide, the proportion (Ca / Si=2.2), mix it thoroughly and make agglomerates, then place the dried agglomerates in a two-stage controlled atmosphere roaster for controlled atmosphere roasting; the material is placed in the first stage of roasting area, and the first stage of roasting is strongly reduced The atmosphere is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=10vol.%, the roasting temperature is 900°C, and the gas flow rate is 0.3m / s; the volatile products enter the second-stage roasting area with the airflow, and the weakly reducing atmosphere of the second-stage roasting is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=5vol.%, the roasting temperature is 700°C, and the gas flow rate is 0.5...

Embodiment 2

[0027]Using tin-containing electronic waste pyrolysis slag as raw material (tin content 9.2%, organic content 0.5%), add composite additives according to the amount of Sn / S=1.5 (composite additives are a mixture of calcium sulfide and silicon dioxide, the proportion (Ca / Si=2.0), mix it well and make agglomerates, then place the dried agglomerates in a two-stage controlled atmosphere roaster for controlled atmosphere roasting; the material is placed in the first stage of roasting area, and the first stage of roasting is strongly reduced The atmosphere is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=10vol.%, the roasting temperature is 850°C, and the gas flow rate is 0.3m / s; the volatile products enter the second-stage roasting area with the airflow, and the weakly reducing atmosphere of the second-stage roasting is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=3vol.%, the roasting temperature is 650°C, and the gas flow rate is 0.4m / s; th...

Embodiment 3

[0029] With tin-containing electronic waste pyrolysis slag as raw material (tin content 9.2%, organic matter content 0.5%), add composite additive for Sn / S=1.8 according to dosage (composite additive is the mixture of calcium sulfide, silicon dioxide, its proportioning (Ca / Si=2.1), mix well and make agglomerates, then place the dried agglomerates in a two-stage controllable atmosphere roaster for controlled atmosphere roasting; the material is placed in the first-stage roasting area, and the first-stage roasting has strong reducibility The atmosphere is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=8vol.%, the roasting temperature is 800°C, and the gas flow rate is 0.2m / s; the volatile products enter the second-stage roasting area with the airflow, and the weakly reducing atmosphere of the second-stage roasting is CO and CO 2 Mixed atmosphere, the concentration is CO / (CO+CO 2 )=2vol.%, the roasting temperature is 550°C, and the gas flow rate is 0.2m / s; the...

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Abstract

The invention discloses a method for preparing nano-stannous sulfide from tin-containing electronic waste in one step. The method is to mix the tin-containing electronic waste with an additive composed of calcium sulfide and silicon dioxide to make agglomerates, and place the Reduction roasting is carried out at 750-900°C in a neutral atmosphere, and the roasted volatiles enter a weakly reducing atmosphere for reduction roasting at 450-700°C to obtain nano-stannous sulfide powder. The method uses tin-containing electronic waste as a raw material to efficiently recover tin and prepare a high-purity nano-tin sulfide powder material, which not only realizes waste utilization, but also has high economic added value, and the method is simple to operate, low in production cost, and environmentally friendly. Meet the requirements of industrial production.

Description

technical field [0001] The invention relates to a preparation method of nano-tin sulfide, in particular to a method of using tin-containing electronic waste as a tin source, separating tin from tin-containing electronic waste and recovering tin in the form of high-purity nano-zinc oxide. The invention belongs to the technical field of electronic waste recycling. Background technique [0002] The electronic waste in "urban mines" contains huge reserves of rare metals and precious metal resources, which will be the focus of future extraction metallurgy. Unlike natural ores, metal elements in electronic waste mostly exist in the form of metal elements and alloys, so the extraction metallurgical process cannot be completely similar to the traditional metallurgical process. At the same time, there are many kinds of metal elements in electronic waste, and the content is extremely high. If they are completely put into the traditional pyrometallurgical and hydrometallurgical proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B25/06C22B25/02C01G19/00B82Y40/00
CPCB82Y40/00C01G19/00C22B7/002C22B25/02C22B25/06Y02P10/20
Inventor 苏子键张元波姜涛侯炜范晓慧李光辉郭宇峰彭志伟饶明军路漫漫王嘉涂义康
Owner CENT SOUTH UNIV
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