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Method for selectively separating chromium and ferrum in sulfate solution

A technology of sulfuric acid system and separation method, which is applied in the field of iron separation and chromium in sulfuric acid leaching solution of chromium-containing iron electroplating sludge, which can solve the problem of failure to realize the resource utilization of valuable metals, sensitivity to oxalic acid addition and temperature factors, and initial solution neutralization Large load and other problems, to achieve ideal separation effect, significant economic benefits, low cost effect

Active Publication Date: 2014-06-25
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
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Problems solved by technology

Although the ferrous oxalate precipitation method can achieve an iron removal rate of about 98% at room temperature, the iron removal rate is sensitive to the amount of oxalic acid added and temperature factors, and has strict requirements for operation, and the optimal reaction pH is about 4.0, the initial solution Large neutralization load
[0007] (4) Goethite method, remove iron from sulfuric acid chromium solution and recover chromium, although the iron removal rate of goethite method is as high as 99%, but the loss rate of chromium is also high (about 15%)
This method is only a stabilization treatment of electroplating sludge, and does not realize the resource utilization of valuable metals

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The content of Cr in the mixed solution of chromium and iron in the sulfuric acid system is 6.0 g / L, the content of Fe is 3.0 g / L, the reducing agent is sodium sulfite, and the sodium sulfite solution with a concentration of 20% and the mixed solution of chromium and iron are added dropwise at a ratio of 1:10. Add an appropriate amount of NaOH solution to adjust the pH of the solution to 2.0, add sodium phosphate according to the molar ratio of phosphate and chromium ions of 0.4, keep it warm at 90 °C for 60 min, control the stirring line speed at 200 m / min during the process, and filter to obtain chromium phosphate Chromium hydroxide composite precipitate, the concentrations of chromium and iron in the filtrate were 0.086 g / L and 2.91 g / L respectively, the recovery rate of chromium was 98.53%, the recovery rate of iron was 98.58%, and the separation coefficient of ferrochromium was 67.7.

Embodiment 2

[0031]In the sulfuric acid system, the Cr content in the mixed solution of chromium and iron is 20.0 g / L, and the content of Fe is 15.0 g / L. The reducing agent is sodium sulfite, and the sodium sulfite solution with a concentration of 20% and the mixed solution of chromium and iron are added dropwise at a 1:5 ratio. , add an appropriate amount of NaOH solution to adjust the pH of the solution to 2.0, add sodium phosphate according to the molar ratio of phosphate and chromium ions of 0.3, keep it at 70 °C for 90 min, control the stirring line speed at 300 m / min during the process, and filter to obtain phosphoric acid Chromium chromium hydroxide composite precipitate, the concentration of chromium and iron in the filtrate were 0.089 g / L and 14.89 g / L respectively, the recovery rate of chromium was 99.56%, the recovery rate of iron was 99.08%, and the separation coefficient of ferrochrome was 223.1.

Embodiment 3

[0033] In the sulfuric acid system, the Cr content in the chromium-iron mixed solution is 6.0 g / L, the Fe content is 3.0 g / L, the reducing agent is sodium thiosulfate, and the concentration of 10% sodium thiosulfate solution and chromium-iron mixed solution is 1 Add an appropriate amount of NaOH solution to adjust the pH of the solution to 1.5, add sodium phosphate according to the molar ratio of phosphate and chromium ions of 0.5, and keep warm at 80 °C for 60 min. During the process, the linear speed of stirring is controlled at 150 m / min, the composite precipitate of chromium phosphate and chromium hydroxide was obtained by filtration, the concentrations of chromium and iron in the filtrate were 0.053 g / L and 2.90 g / L respectively, the recovery rate of chromium was 99.10%, and the recovery rate of iron was 99.03%. Coefficient 109.4.

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Abstract

The invention discloses a method for selectively separating chromium and ferrum in a sulfate solution, relates to the selective separation of chromium and ferrum in a sulfate solution during hydrometallurgical process, and particularly relates to a method for separating chromium and ferrum in an electroplating sludge sulfate leaching solution containing chromium. The method is characterized by sequentially comprises the steps that: (1) a reducer is added for pretreatment in a sulfate solution containing chromium and ferrum; (2) the pH value of the solution is adjusted; (3) a soluble phosphate is added to carry out selective phosphate chromium-precipitation reaction so that phosphate chrome and chromium hydroxide form a compound coprecipitate; and (4) filtering separation is carried out to obtain phosphate chromium and chromium hydroxide composite precipitate and filtrate containing ferrous sulfate, and the selective separation of chromium and ferrum is achieved. The method is a hydrometallurgical technology for extraction and separation of chromium and ferrum, which has simple process and short flow and is environment-friendly, and is especially suitable for the field of resource utilization of electroplating sludge containing chromium and ferrum.

Description

technical field [0001] A method for selectively separating chromium and iron in a sulfuric acid system solution relates to the selective separation of chromium and iron in a sulfuric acid system solution in a hydrometallurgical process, in particular to a method for separating chromium and iron in a sulfuric acid leaching solution of ferrochromium-containing electroplating sludge. Background technique [0002] In the process of hydrometallurgy, a sulfuric acid system solution containing chromium and iron will be produced, forming a mixed solution containing chromium sulfate and ferrous sulfate. Due to the similar chemical properties of chromium and iron elements and the adsorption-co-precipitation effect, there are difficulties in the separation and extraction of chromium and iron metals. [0003] The currently developed separation methods for chromium and iron in sulfuric acid system solutions mainly include: [0004] (1) Solvent extraction method, which has the characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B34/32
CPCY02P10/20
Inventor 王成彦徐志峰袁文辉月日辉揭晓武杨卜
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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