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Method for sulfidizing heavy metal waste and recovering valuable metals in heavy metal waste

A technology of vulcanization treatment and valuable metals, which is applied in the field of environmental engineering, can solve the problems of secondary pollution of hydrogen sulfide and strong alkaline wastewater, low vulcanization rate of heavy metals, hindering popularization and use, etc., and achieve good hydrophobicity and buoyancy, The effect of complete vulcanization reaction and little pollution

Active Publication Date: 2010-09-08
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] At home and abroad, the research on the recovery of valuable metals in solid waste by sulfidation flotation is still in its infancy. Most of the existing technologies use sodium sulfide solution method for sulfidation treatment, but the sulfidation time of this process is long, and the sulfidation rate of some heavy metals is low. At the same time, due to the high cost of sodium sulfide, secondary pollution problems such as hydrogen sulfide and strong alkaline wastewater will be generated during the treatment process, which hinders the popularization and use of this technology

Method used

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  • Method for sulfidizing heavy metal waste and recovering valuable metals in heavy metal waste
  • Method for sulfidizing heavy metal waste and recovering valuable metals in heavy metal waste

Examples

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Effect test

Embodiment 1

[0024] Sulfurization of zinc-containing waste residue in a smelter

[0025] Step 1: Grind the zinc-containing waste slag of a smelter to less than 5mm, and mix according to the ratio of Me:S=1:12, wherein Me represents the amount of all heavy metals in the waste slag on a dry basis, and S represents the added sulfur substance amount. Add water simultaneously, to guarantee that the liquid-solid ratio is 5: 1, then add vulcanization accelerator (the amount that adds is 5% of dry basis waste quality) and acid-base regulator, adjust pH value to be 12, after above-mentioned materials are mixed, put into the planetary ball mill.

[0026] Step 2: Turn on the ball mill, set the rotation speed to 500r / min, the ball milling time to 1 hour, and the ball-to-material ratio to 10:1. After the reaction stops, separate the material from the pellets and put the material into a high-temperature reactor.

[0027] Step 3: Open the autoclave after sealing it, set the temperature to 210°C, and th...

Embodiment 2

[0032] Sulfurization of lead-containing waste residue in a smelter

[0033] Step 1: Grind the sulfur tailings produced by a smelter to less than 5mm, and mix according to the ratio of Me:S=1:1.5, where Me represents the amount of all heavy metals in the waste slag on a unit dry basis, and S represents the added The amount of sulfurous substance. Add water and vulcanization accelerator NaOH at the same time (molar ratio NaOH:S=12:1), the amount of water added is preferably to ensure that the liquid-solid ratio is 5:1, and the above materials are mixed and put into a planetary ball mill.

[0034] Step 2: Turn on the ball mill, set the rotating speed to 500r / min, the ball milling time is 0-8 hours, the ball-to-material ratio is 10:1, and after the reaction stops, the material is separated from the pellets. Dry and grind the materials with different ball milling reaction times, carry out phase analysis, and calculate the change of the vulcanization rate with time ( image 3 ). ...

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Abstract

The invention discloses a method for sulfidizing heavy metal waste and recovering valuable metals in the heavy metal waste, comprising the following steps of: crushing the heavy metal waste, and ball-milling mixing the crushed heavy metal waste with sulphur simple substance and corresponding vulcanizing accelerator; after further fine grinding and activating, putting activated fine residue into a reaction kettle, and using sulphur disproportionation reaction to lead heavy metal in the waste into stable metal sulfide under the condition that the temperature is 160-240 DEG C, and the pressure is 1.8-2.2MPa; completing the process of hydrothermal vulcanization reaction; and then, recovering metals in a way of sulphide ore flotation. By adopting the hydrothermal vulcanization way, the method leads the sulphuration rate of the heavy metal in the residue to reach more than 90%, and secondary pollution is not caused in the sulphuration process. The method is not only used for sulfidizing and recovering the valuable metals in the waste residue, but also used for sulfidizing and stabilizing treatment of heavy metal waste residue.

Description

technical field [0001] The invention belongs to the field of environmental engineering, and relates to a method for sulfuration treatment of heavy metal waste and recovery of valuable metals. Background technique [0002] Heavy metal solid waste is one of the main forms of heavy metal pollution in the environment. With the increasing frequency of production activities such as non-ferrous metal mining, dressing and smelting, chemical industry, the heavy metal solid waste produced has greatly increased both in quantity and in type. The discharge and stockpiling of heavy metal waste not only occupies a large amount of land, but also often contains toxic heavy metals such as arsenic, cadmium, mercury, lead and antimony, which pose a great pollution and threat to the environment. On the other hand, my country's current shortage of mineral resources, the situation is grim. Lead, zinc, tungsten, tin, antimony, and rare earth mineral resources are relatively abundant, but most of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 柴立元闵小波梁彦杰彭兵杨志辉王云燕
Owner CENT SOUTH UNIV
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