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Method for recycling tin from tin-containing lead slag

A technology of tin lead and tin chloride, applied in the field of solid waste recycling, can solve problems such as environmental pollution and resource waste, and achieve the effect of simple and controllable process

Active Publication Date: 2020-03-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the invention provides a method for recovering tin from tin-lead slag, which prepares sodium stannate product through chlorination-water immersion-alkali fusion-water immersion-concentration and crystallization process , and at the same time realize the recycling of chlorination reagents in the process of chlorination reaction, reduce the usage of chlorination reagents, improve the economical efficiency of the process, thereby solving the existing technology of environmental pollution and waste of resources caused by the stacking of tin and lead slag question

Method used

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  • Method for recycling tin from tin-containing lead slag
  • Method for recycling tin from tin-containing lead slag
  • Method for recycling tin from tin-containing lead slag

Examples

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Effect test

Embodiment 1

[0057] Evenly mix 1g of tin-lead slag and 5g of ammonium chloride, press the mixture into a block, place it in a crucible, place the crucible in the heating zone of the quartz tube, control the heating temperature to 500°C, and the heating time to 30min. Adjust so that the air pressure in the system is 100kPa. After the chlorination reaction is finished, the remaining residue in the crucible is chlorination residue, and the chlorination condensation product is obtained in the condensation zone. The tin content in the chlorinated condensate was 0.73 wt%. The chlorination condensed product is subjected to water leaching, the leaching solid-to-liquid ratio is controlled to be 100g / L, and the leaching time is 2h. After the leaching is completed, the solid and liquid are separated to obtain the leaching product and filtrate. The dried leaching product is mixed with sodium hydroxide according to the mass ratio of 1:6, and the alkali fusion reaction is carried out. The alkali fusion...

Embodiment 2

[0059] Evenly mix 1g of tin-lead slag with 30g of ammonium chloride, press the mixture into a block, place it in a crucible, place the crucible in the heating zone of the quartz tube, control the heating temperature to 700°C, and the heating time to 90min. Adjust so that the air pressure in the system is 5 Pa. After the chlorination reaction is completed, the remaining residue in the crucible is chlorination residue, and the chlorination condensation product is obtained in the condensation zone. Mix the obtained chlorination condensate with tin-lead slag again, press it into a block, place it in a crucible for another chlorination reaction, control the chlorination conditions to be the same as the first chlorination, and obtain chlorination after the reaction is over. The condensed product was recirculated twice to obtain the chlorinated condensed product. The tin content in the chlorinated condensate was 2.36 wt%. The chlorinated condensation product is subjected to water le...

Embodiment 3

[0061] Evenly mix 1g of tin-lead slag with 15g of ammonium chloride, press the mixture into a block, place it in a crucible, place the crucible in the heating zone of the quartz tube, control the heating temperature to 350°C, and the heating time to 15min. Adjust so that the air pressure in the system is 50 Pa. After the chlorination reaction is finished, the remaining residue in the crucible is chlorination residue, and the chlorination condensation product is obtained in the condensation zone. The tin content in the chlorinated condensate was 0.52 wt%. The chlorination condensed product is subjected to water leaching, the leaching solid-to-liquid ratio is controlled to be 50g / L, and the leaching time is 0.5h. After the leaching is completed, the solid and liquid are separated to obtain the leaching product and filtrate. The dried leaching product is mixed with sodium hydroxide at a mass ratio of 1:3 for alkali fusion reaction, the alkali fusion temperature is controlled at ...

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Abstract

The invention belongs to the field of solid waste recycling, and particularly relates to a method for recycling tin from tin-containing lead slag. According to the method for recycling tin from tin-containing lead slag, a sodium stannate product is prepared through a chlorination-water leaching-alkali fusion-water leaching-concentration crystallization process, the process is simple and controllable, low-grade tin elements in the tin-containing lead slag can be extracted, and the sodium stannate product is prepared. The prepared sodium stannate product meets the GB / T26040 first-level standard.The tin recycling rate in the process can reach 93.8wt%. The method provides a feasible path for recycling of low-grade tin slag.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and more specifically relates to a method for recovering tin from tin-lead slag. Background technique [0002] In the pyro-smelting process of waste lead-acid batteries, a large amount of solid waste will be produced, most of which are lead-related hazardous waste. Due to the difference in smelting process and raw materials, the composition of solid waste varies greatly. [0003] During the smelting process of the scrap alloy grids selected from the dismantling of waste lead-acid batteries, because the grids contain a certain amount of tin elements, lead alloys are obtained during the alloy grid smelting process, but a large amount of lead-containing smelting is also produced. Waste residue, wherein the tin content can reach 10-20wt%. Due to the high tin content in the lead-containing smelting waste slag, which has a strong resource value, secondary lead enterprises generally obtain high-ti...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B25/06
CPCC22B7/008C22B25/04C22B25/06Y02P10/20
Inventor 杨家宽李名扬梁莎王俊雄胡广胡敬平肖可可侯慧杰刘冰川杨自荣
Owner HUAZHONG UNIV OF SCI & TECH
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