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Method for comprehensively utilizing iron vitriol dreg of yellow sodium

A technology of jarosite slag and leaching slag, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of complex process, no effective recovery of valuable metals, acid consumption, roasting flue gas pollution, etc. Save pollution, shorten processing time, good quality effect

Inactive Publication Date: 2009-04-15
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent WO9730936-A proposes the method of using nitric acid to assist leaching of jarosite slag to produce ferric sulfate for water treatment, so as to achieve the purpose of pollution control, but does not propose a method for effectively recovering valuable metals and reducing acid consumption
In addition, the patent KR8902856-B proposes to roast the jarosite slag, add alkali to neutralize the precipitate after leaching with water, and mix the precipitate with activated carbon as a hydrogen sulfide adsorbent; Roasting, cleaning and drying to obtain iron red pigment; patent SU1255607-A proposes a method of roasting iron alum at 300-400°C as an ingredient for building adhesives. These processing methods have roasting smoke pollution and complicated processes, etc. Inadequacies

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  • Method for comprehensively utilizing iron vitriol dreg of yellow sodium

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Experimental program
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Effect test

Embodiment 1

[0030] The valuable metals in the jarosite slag are selectively leached with a sulfuric acid solution with a mass concentration of 1% at a liquid-solid ratio of 3:1, and the average leaching rate of the valuable metals is 80%.

[0031] Fully mix the leached residue with sulfuric acid, the amount of sulfuric acid is 30% of the quality of the jarosite residue, and heat for 15 minutes under microwave radiation to decompose the jarosite, wherein the microwave frequency is 2450±50MHz.

[0032] Add water and scrap iron sheets to the microwave-irradiated material, age for 8 hours, adjust the total iron concentration in the solution to 160g / L, and the ferrous ion content accounts for 20% of the total iron content; then at a temperature of 40°C, use The oxidant hydrogen peroxide oxidizes the divalent iron ions in the above solution to ferric ions, and the reaction time is 1h; the amount of hydrogen peroxide is 1.5 times the amount required to oxidize all the divalent iron ions to ferric...

Embodiment 2

[0034] The valuable metals in the jarosite slag are selectively leached with dilute sulfuric acid with a mass concentration of 3% at a liquid-to-solid ratio of 5:1, and the average leaching rate of valuable metals is 90%.

[0035] Fully mix the leached residue with sulfuric acid, the amount of sulfuric acid is 40% of the quality of the jarosite residue, and heat for 10 minutes under microwave radiation to decompose the jarosite, wherein the microwave frequency is 2450±50MHz.

[0036]Add the microwave irradiated materials to water and scrap iron sheets, age for 5 hours, adjust the total iron concentration in the solution to 170g / L, and the ferrous ion content accounts for 30% of the total iron content; then, at a temperature of 60°C, use The oxidant hydrogen peroxide oxidizes the ferrous ions in the above solution to ferric ions, and the reaction time is 2 hours; the amount of hydrogen peroxide is 1.0 times the amount required to oxidize all the ferric ions to ferric ions. Wate...

Embodiment 3

[0038] The valuable metals in the jarosite slag were selectively leached with dilute sulfuric acid with a mass concentration of 5% at a liquid-to-solid ratio of 10:1, and the average leaching rate of valuable metals was 93%.

[0039] Fully mix the leached residue with sulfuric acid, the amount of sulfuric acid is 60% of the quality of the jarosite residue, and heat for 6 minutes under microwave radiation to decompose the jarosite; the microwave frequency is 916±18MHz.

[0040] Add water and iron filings to the microwave-irradiated material, mature for 2 hours, adjust the total iron concentration in the solution to 180g / L, and the ferrous ion content accounts for 40% of the total iron content; then, at a temperature of 80°C, use an oxidizing agent Sodium chlorate oxidizes the divalent iron ions in the above solution to ferric ions, and the reaction time is 3 hours; the amount of sodium chlorate is 1.0 times the amount required to oxidize all the divalent iron ions to ferric ions...

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Abstract

The invention relates to a comprehensive utilization method of amarillite slag, which is characterized by including the following steps: (1) the valuable metals in the amarillite slag are selectively leached by using sulfuric acid solution, thus obtaining the leaching slag and the leaching agent; (2) the leaching slag and sulphuric acid are mixed then heated under microwave radiation; (3) water and a substance containing iron are added into the material after microwave radiation, quiescence and slaking are carried out at normal temperature condition and (4) the material is heated, ferrous iron in the solution is oxidized by using an oxidant, then the polymerization ferric sulfate is prepared through hydrolysis and polymerization by ferric iron. The invention effectively retrieves the valuable metals in the amarillite slag, reduces reagent consumption and energy consumption during amarillite slag treatment process, shortens the treatment time, has no environmental pollution during the treatment process, obtains the water treatment agent polymerization ferric sulfate with good quality, and can effectively solve the problems of the stockpiling and pollution of the amarillite slag.

Description

technical field [0001] The invention belongs to the field of industrial waste residue treatment, in particular to a method for comprehensively utilizing jarosite residue. Background technique [0002] In the hydrometallurgical process of copper, nickel, cobalt, zinc and other non-ferrous metals, the jarosite method is often used to remove iron in the solution, and the waste slag produced by this iron removal method is jarosite slag. Due to the lack of reasonable treatment methods, a large amount of iron alumina slag is piled up near the factory, which not only occupies land, but also causes harm to the environment. Although other iron removal methods, such as hematite method, goethite method, etc., are also widely used, due to technical and economic reasons, many hydrometallurgical plants still use the iron vitriol method to remove iron, so there are still a large number of iron removal methods every year. Alum slag is produced. Therefore, the comprehensive utilization of ...

Claims

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Application Information

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IPC IPC(8): C02F1/52
Inventor 符岩翟秀静范川林
Owner NORTHEASTERN UNIV
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