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Method for preparing nano stannous sulfide from tin-containing electronic waste by one-step method

A technology of electronic waste and stannous sulfide, applied in chemical instruments and methods, tin compounds, nanotechnology, etc., can solve the problems of harsh preparation conditions, low economic added value, and low output, and achieve the effect of efficient and selective separation

Active Publication Date: 2021-02-23
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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  • Method for preparing nano stannous sulfide from tin-containing electronic waste by one-step method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Taking tin containing electron waste heat dissipating slag as raw materials (9.2% tin content, 0.5% organic content), adding composite additives (composite additives as a mixture of calcium sulfide, silica) according to Sn / S = 2.0, mixture of sulfide, silica For CA / Si = 2.2), mix it with a mixture, then placed the drying mass in two-stage controllable atmosphere calcination furnace to perform control atmosphere roast; material is placed in a roast area, a piece of roasting strong reduction Sexual atmosphere CO and CO2Mixed atmosphere, concentration is Co / (CO + CO2= 10 vol.%, The calcination temperature is 900 ° C, the gas flow rate is 0.3m / s; the volatile product enters the two-stage roasting area with the air flow, and the two-stage roasting reductive atmosphere is CO and CO.2Mixed atmosphere, concentration is Co / (CO + CO2= 5Vol.%, The calcination temperature is 700 ° C, the gas flow rate is 0.5 m / s; the product can be separated from the segment area, the tin reco...

Embodiment 2

[0027]Using tin-containing electronic waste pyrolysis slag as raw material (tin content 9.2%, organic content 0.5%), add compound additives according to the amount of Sn / S=1.5 (composite additives are a mixture of calcium sulfide and silicon dioxide, and the ratio Ca / Si=2.0), mix it well and form agglomerates, then place the dried agglomerates in a two-stage controlled atmosphere roasting furnace for controlled atmosphere roasting; the material is placed in a roasting zone, and the roasting is strong reduction. Sexual atmosphere is CO and CO2Mixed atmosphere, concentration is CO / (CO+CO2)=10vol.%, the roasting temperature is 850℃, the gas flow rate is 0.3m / s; the volatile products enter the second-stage roasting zone with the gas flow, and the weakly reducing atmosphere for the second-stage roasting is CO and CO2Mixed atmosphere, concentration is CO / (CO+CO2)=3vol.%, the roasting temperature is 650℃, the gas flow rate is 0.4m / s; the product can be separated and collected in the second...

Embodiment 3

[0029]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 = 1.8 (composite additives are a mixture of calcium sulfide and silica, and the ratio Ca / Si=2.1), mix well and form agglomerates, then place the dried agglomerates in a two-stage controlled atmosphere roasting furnace for controlled atmosphere roasting; the material is placed in a roasting zone, and the roasting is strong in reducing. Atmosphere is CO and CO2Mixed atmosphere, concentration is CO / (CO+CO2)=8vol.%, the roasting temperature is 800℃, the gas flow rate is 0.2m / s; the volatile products enter the second-stage roasting zone with the gas flow, and the weakly reducing atmosphere of the second-stage roasting is CO and CO2Mixed atmosphere, concentration is CO / (CO+CO2)=2vol.%, the roasting temperature is 550℃, the gas flow rate is 0.2m / s; the product can be separated and collected in the second stage area, the...

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Abstract

The invention discloses a method for preparing nano stannous sulfide from tin-containing electronic waste by a one-step method. The method comprises the following steps that the tin-containing electronic waste and an additive composed of calcium sulfide and silicon dioxide are uniformly mixed and then are subjected to agglomeration, agglomerates are placed in a reducing atmosphere to be subjectedto reduction roasting at 750 DEG C-900 DEG C, roasted volatile matters enter a weak reducing atmosphere to be subjected to reduction roasting at 450 DEG C-700 DEG C, and nano stannous sulfide powder is obtained. According to the method, the tin-containing electronic waste serves as the raw material, tin is efficiently recycled, the high-purity nano stannous sulfide powder material is prepared, waste utilization is achieved, the economic additional value is high, and the method is easy to operate, low in production cost, environmentally friendly and capable of meeting the industrial productionrequirement.

Description

Technical field[0001]The present invention relates to a method of preparing nanofuses, and more particularly to a method of recovering tin in a tin-containing electron waste in a tin-containing electron waste, a tin-containing electron waste, and a method of recovering tin in high purity nano-zinc oxide. It belongs to the technical field of electronic waste recovery.Background technique[0002]The e-waste in the "City Mine" contains a huge reserves, which is the focus of future extraction of metallurgical attention. Unlike natural ores, in electronic waste, metal elements are in the form of metallic and alloys, so they cannot be completely similar to traditional metallurgical processes. At the same time, there are a wide variety of metal elements in electronic waste, and the content is extremely high. If it is completely put into traditional fire, the wet metallurgy process, the metal element is high, especially during the fire, gold and silver and other precious metals are easy. It i...

Claims

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Application Information

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Patent Type & Authority Applications(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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