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Electrochemical process for the recovery of metallic iron and sulfuric acid values from iron-rich sulfate wastes, mining residues and pickling liquors

An electrochemical and metal sulfate technology, applied in the direction of electrodes, optics, electrolysis, etc., can solve the problems of expensive organic solvents, and the scale of industrial application has not been reached.

Active Publication Date: 2011-06-01
弗朗索瓦·卡达雷利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to date, this approach has never reached an industrial scale due to the prohibitive cost of the organic solvents involved

Method used

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  • Electrochemical process for the recovery of metallic iron and sulfuric acid values from iron-rich sulfate wastes, mining residues and pickling liquors
  • Electrochemical process for the recovery of metallic iron and sulfuric acid values from iron-rich sulfate wastes, mining residues and pickling liquors
  • Electrochemical process for the recovery of metallic iron and sulfuric acid values from iron-rich sulfate wastes, mining residues and pickling liquors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] Preparation of iron-rich metal sulfate solutions and removal of trace ferric cations. A batch of iron (II) sulfate heptahydrate, also known as columbite, from a titanium pigment producer was used to prepare the synthesis solution. The material was dissolved in deionized and degassed water. After the soluble salts were completely dissolved, samples were taken for measurement of mass density, total iron content and concentration of ferric cations.

[0129] After determining the ferric cation, the pH of the solution was adjusted by adding iron (II) carbonate or sulfuric acid until the pH of the solution reached 3.5. At this pH, any traces of ferric iron were deposited as ferric hydroxide, which was subsequently removed by filtration. The clarified ferric sulfate solution is then acidified to a pH of about 0.5 (at this pH, air oxidation of ferrous iron (Fe 2+ ) into ferric iron (Fe 3+ )the process of). A nitrogen blanket was maintained over the solution to further prev...

Embodiment 2

[0131] Example 2a - Electrolysis of iron rich metal sulphate solution at pH 1.4 and 50°C. The pH value of the iron-rich metal sulfate solution of Example 1 was adjusted to 1.4 by adding a trace amount of iron (II) carbonate, and then circulated inside the cathode chamber of the electrolytic cell. The electrolytic cell consists of a plate type electrolytic cell ( Figure 5 ) and two compartments separated by an anion exchange membrane. Geometry Electrode and membrane surface area is 929cm 2 (1 square foot) with a 1 inch (2.54 cm) separation between each electrode and separator. The cathode chamber contained the cathode plate, which was made of CP titanium (ASTM grade 2, supplied by RMI (Niles, OH)). Before electrolysis, by immersing the cathode in boiling oxalic acid (10 wt% H 2 C 2 o 4 ) and rinsed thoroughly with deionized water until no traces of acid remained. The anode compartment is filled with dimensionally stable TiR- type anode (DSA TM -O 2 ) (supplied by El...

Embodiment 3

[0141] The iron-rich metal sulfate solution was electrolyzed using a three-compartment electrolytic cell. The pH value of the iron-rich metal sulfate of Example 1 was adjusted to 1.4 by adding iron (II) carbonate, and then circulated inside the central chamber of the three-chamber electrolytic cell. The electrolytic cell consists of a plate type electrolytic cell ( Figure 4 ) consists of three compartments separated by an anion exchange membrane and a cation exchange membrane. Geometry Electrode and membrane surface area is 929cm 2 (1 square foot) with a 1 inch (2.54 cm) separation between each electrode and separator. The spacing between individual films was 1 inch (2.54 cm).

[0142] The cathode chamber contained the cathode plate, which was made of CP titanium (ASTM grade 2, supplied by RMI (Niles, OH)). Before electrolysis, by immersing the cathode in boiling oxalic acid (10 wt% H 2 C 2 o 4 ) and rinsed thoroughly with deionized water until no traces of acid remain...

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Abstract

An electrochemical process for the recovery of metallic iron or an iron-rich alloy, oxygen and sulfuric acid from iron-rich metal sulfate wastes is described. Broadly, the electrochemical process comprises providing an iron-rich metal sulfate solution; electrolyzing the iron-rich metal sulfate solution in an electrolyzer comprising a cathodic compartment equipped with a cathode having a hydrogen over- potential equal or higher than that of iron and containing a catholyte having a pH below about 6.0; an anodic compartment equipped with an anode and containing an anolyte; and a separator allowing for anion passage; and recovering electrodeposited iron or iron-rich alloy, sulfuric acid and oxygen gas. Electrolyzing the iron-rich metal sulfate solution causes iron or an iron-rich alloy to be electrodeposited at the cathode, nascent oxygen gas to evolve at the anode, sulfuric acid to accumulate in the anodic compartment and an iron depleted solution to be produced.

Description

technical field [0001] The present invention relates to an electrochemical process for the recovery of metallic iron, iron-rich alloys, oxygen and sulfuric acid useful materials from iron-rich metal sulphate waste. More particularly, but not exclusively, the present invention relates to methods for extracting iron-rich metal sulfate waste such as columbite, iron-rich sulfate liquor, spent sulfuric acid leachate, pickling liquor, or any other iron-rich metal sulfate liquor or solution. Electrochemical method for the recovery of metallic iron or ferrous alloys, oxygen and sulfuric acid from other iron-rich metallic sulfuric acid liquids or solutions such as those incidentally produced in the mining, metallurgy, chemical or titanium dioxide pigment industries. Background technique [0002] During the manufacture of white titanium dioxide pigments by the sulfate process, titanium-rich raw materials (eg, ilmenite, titanium slag) are first dried to a water content of less than 0.1...

Claims

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Application Information

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IPC IPC(8): C25C1/06C22B3/04C23F1/26C25B1/02C25B1/22C25B11/04C25C7/00
CPCC22B3/44C25D3/20C25D17/002C25D17/12C22B3/045C23G1/36C22B3/08C25D17/00C25C1/06C22B7/006C23F1/16Y02P10/20
Inventor 弗朗索瓦·卡达雷利
Owner 弗朗索瓦·卡达雷利
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