Method for removing iron ions in trivalent chromium acid solution

An acid solution and trivalent chromium technology, applied in the fields of efficient removal of iron ions in trivalent chromium acid solution, iron removal agent circulation and high-value utilization of iron, can solve the problem of high iron removal cost and reduce iron removal agent consumption. , to achieve the effect of high-value utilization and short process flow

Active Publication Date: 2017-02-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0009] Aiming at the problem of high cost of iron removal in trivalent chromium acidic solution, the present invention proposes a new method for iron removal in trivalent chromium acidic solution, which can realize the recycling of oxalate and make iron into ferric oxide for use in iron black raw material

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  • Method for removing iron ions in trivalent chromium acid solution

Examples

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Embodiment 1

[0041] Add a theoretical amount of 105% hydrazine hydrate solution to the high-carbon ferrochrome acid hydrolysis solution, add sodium oxalate solution to the reaction solution after the reaction, adjust the solution to between 2.5 and 3.0, filter the reaction solution, and the filtrate is used to produce chromium Salt, obtained ferrous oxalate its main chemical composition w(FeC 2 o 4 2H 2 O)=94.8%, and other impurities are trace amounts of Mn, Ni, Co, etc.

[0042] Put the ferrous oxalate sample and ammonia water with a mass fraction of 27% in a three-necked flask, the reaction temperature is 60°C, and the liquid-solid ratio (L / kg) is maintained at 2:1, feed oxygen and start timing, and stop stirring after 2 hours of reaction , maintain the filtration temperature of 60°C to filter the reaction solution, after the filtration, wash the filter cake twice with clean water, and dry the filtered filter cake in an oven at 100°C to become iron oxide black, and combine the leaching...

Embodiment 2

[0044] Add a theoretical amount of 110% sodium metabisulfite to the vanadium-chromium slag sulfuric acid acid hydrolysis solution, add potassium oxalate solution to the reaction solution after the reaction, adjust the concentration of the solution to 2.5-3.0, filter the reaction solution, and the filtrate is used to produce chromium salt , the main chemical composition of the obtained ferrous oxalate w(FeC 2 o 4 2H 2 O)=95.1%, and other impurities are trace amounts of Mn, Ni, Co, etc.

[0045] Place the ferrous oxalate sample and 10% sodium hydroxide solution in a three-necked flask, the reaction temperature is 60°C, the liquid-solid ratio (L / kg) is maintained at 3:1, air is introduced and timing is started, and the reaction is 1.5 Stop stirring after h, maintain the filtration temperature of 70°C to filter the reaction solution, and wash the filter cake with clear water 3 times in countercurrent after the filtration, and the filter cake after filtration is iron oxide black ...

Embodiment 3

[0047] Add a theoretical amount of 110% vitamin C to the chromite acid hydrolysis solution, add ammonium oxalate solution to the reaction solution after the reaction, adjust the concentration of the solution to between 2.5 and 3.0, filter the reaction solution, and the filtrate is used to produce chromium salt. Its main chemical composition w(FeC 2 o 4 2H 2 O)=96.1%, and other impurities are trace amounts of Mn, Ni, Co, etc.

[0048] Place the ferrous oxalate sample and potassium hydroxide solution with a mass fraction of 40% in a three-necked flask, the reaction temperature is 80°C, and the liquid-solid ratio (L / kg) is maintained at 4:1, adding sodium peroxide solution and starting timing, After reacting for 2.2 hours, stop stirring, maintain the filtration temperature at 80°C to filter the reaction solution, and wash the filter cake with clean water for 4 times in countercurrent after filtration, and dry the filtered filter cake in an oven at 80°C to become iron oxide blac...

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Abstract

The invention discloses a method for removing iron ions in a trivalent chromium acid solution. The method includes the following steps that an additive is added into the trivalent chromium acid solution to reduce the trivalent ferric ions to bivalent ferric ions, then an oxalate solution is added, leached materials are subjected to liquid-solid separation, and the trivalent chromium acid solution obtained after iron removing is used for producing a chromium slat product; and ferrous oxalate obtained after iron removing is subjected to oxidation leaching in an alkali solution, iron in the ferrous oxalate is converted into ferroferric oxide, oxalate is leached into the solution liquid-solid separation is carried out, an oxalate leaching agent is obtained and used for cyclically removing iron, and the obtained ferroferric oxide becomes a black iron oxide pigment after being dried. According to the method, consumption of an iron removing agent is greatly reduced, iron is removed thoroughly through the trivalent chromium acid solution, the byproduct of black iron oxide can reach the pigment performance of domestic 722 black iron oxide and does not contain high-toxicity hexavalent chromium, and the method can be used in the industries of buildings, coatings and the like.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for removing iron ions in a trivalent chromium acidic solution, in particular to a method for efficiently removing iron ions in a trivalent chromium acidic solution, circulation of an iron removing agent, and high-value iron method of use. Background technique [0002] Trivalent chromium acidic solution comes from a wide range of sources, such as high-carbon ferrochrome, chromite, vanadium-chromium slag in the vanadium metallurgy industry and other chromium-containing raw materials or waste residues reacted with sulfuric acid, hydrochloric acid or nitric acid, and the acid solution produced by the reaction of chromium and iron. Acidic wastewater, etc., because the raw materials generally contain iron, the trivalent chromium acidic solution contains iron ions. The trivalent chromium acidic solution containing iron ions can be directly used to produce trivalent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/06C22B34/32
CPCY02P10/20
Inventor 张洋郑诗礼杨柳张盈乔珊张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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