Method for extracting chromium by electrochemically decomposing chromite in potassium hydroxide solution

A potassium hydroxide, electrochemical technology, applied in the electrolysis process, electrolysis components, electrolysis organic production and other directions, can solve the problem of high equipment requirements, and achieve the effects of reducing reaction temperature, efficient extraction, and low chromium content

Inactive Publication Date: 2013-04-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, this method requires pressurized operation, which requires high equipment

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  • Method for extracting chromium by electrochemically decomposing chromite in potassium hydroxide solution

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Embodiment approach

[0056] As a kind of embodiment of the present invention, the method for extracting chromium by electrochemical decomposition of chromite in a kind of potassium hydroxide solution described in the present invention, comprises the steps:

[0057] (1) Preheating of ingredients: Mix and heat chromite sieved to -200 mesh with potassium hydroxide aqueous solution to obtain raw material slurry, and preheat to 150-200°C, wherein the mass ratio of potassium hydroxide to chromite ≥3:1, the mass concentration of potassium hydroxide aqueous solution is 50-75%;

[0058] (2) Electrolysis: Add the raw material slurry obtained in step (1) into an atmospheric pressure electrolytic cell, pass oxidizing gas into the solution and apply mechanical stirring, control the gas flow rate to 0.7-1.4L / min, and the stirring rate to 700 -1000rpm, use stainless steel plate as anode, stainless steel rod as cathode, control anode current density ≥ 500A / m 2 , electrolysis for more than 4 hours, the reaction s...

Embodiment 1

[0063] A method for electrochemically decomposing chromite in potassium hydroxide solution to extract chromium, comprising the steps:

[0064] (1) Preheating of ingredients: Mix and heat chromite sieved to -200 mesh with potassium hydroxide aqueous solution to prepare mixed slurry, and preheat to 150°C, wherein the mass ratio of potassium hydroxide to chromite is 6: 1. The mass concentration of potassium hydroxide aqueous solution is 70%, that is, weigh 35g of chromite, 247.00g of KOH (containing 15% water), and 52.95g of pure water;

[0065] (2) Electrolysis: Add the raw material slurry obtained in step (1) into an atmospheric pressure electrolyzer, pass oxygen into the solution and apply mechanical stirring, control the gas flow rate to 1.0L / min, and the stirring rate to 850rpm, with an iron plate As the anode, the stainless steel rod is used as the cathode, and the anode current density is controlled to 1000A / m 2 , electrolysis 6h;

[0066] (3) Dilution: Dilute the reacti...

Embodiment 2

[0069]A method for electrochemically decomposing chromite in potassium hydroxide solution to extract chromium, comprising the steps:

[0070] (1) Preheating of ingredients: Mix and heat chromite sieved to -200 mesh with potassium hydroxide aqueous solution to prepare mixed slurry, and preheat to 180°C, wherein the mass ratio of potassium hydroxide to chromite is 6: 1. The mass concentration of potassium hydroxide aqueous solution is 70%, that is, weigh 35g of chromite, 247.06g of KOH (containing 15% water), and 52.95g of pure water;

[0071] (2) Electrolysis: Add the raw material slurry obtained in step (1) into an atmospheric pressure electrolytic cell, pass oxidizing gas into the solution and apply mechanical stirring, control the gas flow rate to 1.0L / min, and the stirring rate to 800rpm, to The iron plate is used as the anode, the stainless steel rod is used as the cathode, and the anode current density is controlled to 1200A / m 2 , electrolysis 8h;

[0072] (3) Dilution:...

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Abstract

The invention relates to a method for extracting chromium by electrochemically decomposing chromite in a potassium hydroxide solution. The method comprises the steps as follows: filling oxidizing gas into mixed slurry containing chromite, potassium hydroxide and water; carrying out electrochemical oxidization reaction; and after the reaction, carrying out solid-liquid separation on the mixed slurry to obtain tailings and a chromium alkali solution. The method is low in cost, high in extraction efficiency, pollution-free and moderate in process conditions, and the chromium extraction rate can reach more than 95%.

Description

technical field [0001] The invention relates to a method for electrochemically decomposing chromite to extract chromium, in particular to a method for electrochemically decomposing chromite in potassium hydroxide solution to extract chromium. Background technique [0002] Chromite, a mineral in the spinel configuration, is the only chromium ore currently available for mining. The composition of chromite is complex, the main components are oxides of iron, magnesium and chromium, and the general formula can be expressed as (Fe,Mg)Cr 2 o 4 . The main producing areas of chromite are Brazil and Cuba, and the main producing countries are India, Iran, Pakistan, Oman, Zimbabwe, Turkey and South Africa, accounting for 80% of the world's production. As far as China is concerned, chromite mainly exists in Sichuan, Tibet, Gansu, Qinghai and other provinces. It is a shortage of minerals in my country, with small reserves and low output. More than 80% of annual consumption depends on i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/12C22B34/32C25B3/13
Inventor 郑诗礼杜浩王中行王少娜张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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