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Iron vitriol slag treatment method

A technology of jarosite slag and ferric sulfate, applied in directions such as the improvement of process efficiency, can solve the problems such as the inability to recover iron

Inactive Publication Date: 2016-10-12
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, an object of the present invention is to propose a kind of method that has treatment jarosite slag, and this method can effectively reclaim the iron, lead, zinc and silver in the jarosite slag, has solved the problem that iron in the jarosite slag cannot be reclaimed in the prior art difficult problem, and the recovery rate of iron, lead, zinc and silver can be as high as 90% or more

Method used

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Examples

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Effect test

Embodiment 1

[0050] Auxinite slag (13.2% S content, 5.2% zinc content, 3.2% lead content) and anthracite (below 4mm in particle size) are mixed according to the mass ratio of 100:8, and the mixed material is sent to the sub-distributor through the distribution device In the stage reduction furnace, the reduction furnace is divided into two temperature zones: the decomposition zone and the reduction zone. The temperature in the decomposition zone is 750°C, the residence time of the material is 2h, and the decomposition zone needs to be fed with CO to adjust the atmosphere to ensure that the CO concentration is Above 2000ppm, iron sulfate, lead sulfate, zinc sulfate and silver sulfate in the iron slag are decomposed to obtain sulfur dioxide and decomposition products containing iron oxide, lead oxide, zinc oxide and silver oxide, and the sulfur dioxide is discharged through the flue, and the obtained The decomposition product is transported to the reduction area, the reduction temperature is ...

Embodiment 2

[0052] Mix the alum slag (with S content of 13.2%, zinc content of 5.2%, and lead content of 3.2%) with semi-coke (with a particle size below 4mm) at a mass ratio of 100:8, and the mixed material is sent into the In the segmented reduction furnace, the reduction furnace is divided into two temperature zones: the decomposition zone and the reduction zone. The temperature in the decomposition zone is 800°C, the residence time of the material is 3h, and the decomposition zone needs to be fed with CO to adjust the atmosphere to ensure the CO concentration. It is more than 2000ppm, so that iron sulfate, lead sulfate, zinc sulfate and silver sulfate in the alumina slag undergo decomposition reactions to obtain sulfur dioxide and decomposition products containing iron oxide, lead oxide, zinc oxide and silver oxide, and the sulfur dioxide is discharged through the flue. The obtained decomposition products are transported to the reduction area, the reduction temperature is 1230 ° C, and...

Embodiment 3

[0054]Mix jarosite slag (13.2% S content, 5.2% zinc content, 3.2% lead content, ground to 200 mesh) and anthracite (below 1mm particle size) according to the mass ratio of 100:8, and the mixed material It is sent into the segmented reduction furnace through the material distribution device. The reduction furnace is divided into two temperature zones: the decomposition zone and the reduction zone. The temperature in the decomposition zone is 800°C, and the material residence time is 2.5h. The atmosphere is adjusted to ensure that the CO concentration is more than 2000ppm, so that iron sulfate, lead sulfate, zinc sulfate and silver sulfate in the alumina slag undergo decomposition reactions to obtain sulfur dioxide and decomposition products containing iron oxide, lead oxide, zinc oxide and silver oxide, and Sulfur dioxide is discharged through the flue, and the resulting decomposition products are transported to the reduction zone. The reduction temperature is 1200°C, and the re...

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Abstract

The invention discloses an iron vitriol slag treatment method. The iron vitriol slag treatment method comprises the following steps: (1) iron vitriol slag is mixed with a reducing agent to obtain a mixture; (2) the mixture is decomposed in a decomposing area of a reducing furnace to obtain sulfur dioxide and a decomposed product containing iron oxide, lead oxide, zinc oxide and silver oxide; (3) the decomposed product containing iron oxide, lead oxide, zinc oxide and silver oxide is reduced in a reducing area of the reducing furnace to obtain a gaseous product containing lead, zinc and silver and a solid product containing metal iron; and (4) the solid product containing metal iron is grinded and magnetically separated to obtain the metal iron and tailings. The method can effectively recover iron, lead, zinc and silver in the iron vitriol slag, solves the difficulty of incapability of recovering iron in the iron vitriol slag in the prior art, and can reach the recovery rates of iron, lead, zinc and silver of above 90%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular, the invention relates to a method for processing ferosite slag. Background technique [0002] A certain amount of smelting waste will be produced in the process of pyrometallurgy and hydrometallurgy. Pyrochemical lead smelting produces a large amount of waste slag, such as blast furnace slag produced by blast furnace lead smelting or direct lead smelting process; lead smelting slag mainly includes blast furnace slag and fuming furnace treatment waste slag. Lead smelting slag is a high-temperature melt with a very complex composition. Due to the difference in raw material composition in lead smelting methods of various factories, the composition of slag produced is also different, mainly composed of FeO, SiO 2 、Al 2 o 3 , CaO, MgO, ZnO, etc., exist in the form of compounds, solid solutions, eutectic mixtures, etc., and also contain sulfides, fluorides, etc. The raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/02C22B19/30C22B11/02C21B15/00
CPCC21B15/00C22B7/001C22B7/04C22B11/023C22B13/025C22B19/30Y02P10/20
Inventor 古明远王敏吴佩佩王健月曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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