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Method for vitrification of arsenic and antimony

A vitrification and glass technology, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve the problems of expensive formation of scorodite, elaborate and complicated landfill procedures, etc.

Inactive Publication Date: 2019-02-05
DUNDEE SUSTAINABLE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes scorodite formation quite expensive and requires an elaborate landfill procedure

Method used

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  • Method for vitrification of arsenic and antimony

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Embodiment Construction

[0012] The present application is further illustrated by the following non-limiting examples.

[0013] figure 1 The flowchart of FIG. 1 describes a method according to an embodiment of an aspect of the present invention.

[0014] When using sodium sulfide Na 2 When S is alkaline dissolved and crystallized, arsenic and antimony are respectively converted into thioates, that is, thioarsenate (Na 3 AsS 4 ) or thioantimonate (Na 3 Sb 4 ) form exists.

[0015] The oxidation of these thiosalts is at a temperature range of about 200°C to 400°C, using air or oxygen, replacing the sulfur on the arsenic and antimony with oxygen, simultaneously producing sulfur dioxide SO 2 , as shown by the following relation:

[0016] Na 3 AsS 4 +6O 2 →Na 3 AsO 4 +4SO 2 (1)

[0017] Na 3 Sb 4 +6O 2 →Na 3 SbO 4 +4SO 2 (2)

[0018] The resulting sodium arsenate (Na 3 AsO 4 ) and sodium antimonate (Na 3 SbO 4 ) are separately incorporated into the glass-forming mixture. The glass...

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Abstract

A method for vitrification of arsenic and antimony, comprising substituting oxygen to sulfur on thiosalts, incorporating resulting sodium arsenate and sodium antimonate into a sodium silicate glass-forming mixture and vitrifying the sodium silicate glass-forming mixture into a resulting glass sequestering the arsenic and antimony.

Description

technical field [0001] This invention relates to the sequestration of arsenic and antimony extracted from sulfo ores. More specifically, the present invention relates to methods of vitrification of arsenic and antimony. Background technique [0002] Typically, concentrates or ores contain significant amounts of arsenic and antimony. The presence of these contaminants can cause substantial losses when smelting this matrix and even hinder its disposal. [0003] To overcome these difficulties, several hydrometallurgical processes have been developed to extract arsenic and antimony contaminants from raw ores or concentrates before collecting valuable metals. [0004] In U.S. Patent 3,911,078 by Nadkarni et al., the use of Na 2 The alkaline solution of S is the extraction medium, from the arsenite type (Cu 3 AsS 4 ) dissolved arsenic in copper ore. Arsenic is recovered as sodium thioarsenate, which is converted to sodium thioantimonate if antimony is present. These thioars...

Claims

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Application Information

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IPC IPC(8): A62D3/30B09B3/00
CPCC03C1/002C03C3/087B09B3/20
Inventor 让·马克·拉兰塞特大卫·勒米厄卡里尔·纳斯鲁拉加布里埃尔·格雷西亚·柯里尔罗曼·巴尔巴鲁
Owner DUNDEE SUSTAINABLE TECH
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