Process for extracting iron from an aqueous acid solution

An acidic aqueous solution, an aqueous solution technology, applied in chemical instruments and methods, water/sewage treatment, mining wastewater treatment, etc., can solve problems such as unfavorable microbial activity, and achieve excellent sediment performance, high biomass concentration, fast and effective iron remove effect

Inactive Publication Date: 2011-10-12
TALVIVAARAN KAIVOSOSAKEYHTIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the circulation of oxygen-containing gas in the fluidized bed is detrimental to the activity of microbial substances

Method used

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  • Process for extracting iron from an aqueous acid solution
  • Process for extracting iron from an aqueous acid solution
  • Process for extracting iron from an aqueous acid solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] In laboratory-scale experiments, a fluidized bed was used comprising activated carbon (CalgonCarbon Filtrasorb 200) as a support and iron-oxidizing biomass Leptospira siderophilum on the surface of the activated carbon. The temperature of the reactor was 37°C, the total capacity of the fluidized bed reactor was 500 ml, and the capacity of the fluidized bed during fluidization was 340 ml. The residence time in the fluidized bed was 2 hours. A pH adjustment unit with a capacity of 4.5 l is connected to the fluidized bed. After a residence time of 7 minutes in the conditioning unit, the solution was sent to the precipitation unit. The capacity of the precipitation unit was 40 1 and the residence time of the solution to be precipitated in said unit was 1 hour. The device operates continuously.

[0087] The ferrous ion content in the solution introduced into the reactor was 14 g / l, and the rate at which the solution was pumped to the reactor was 0.17 l / h. The total amoun...

Embodiment 2

[0091] Under pilot plant conditions, a fluidized bed comprising activated carbon (Calgon Carbon Filtrasorb 200) as support and iron-oxidizing biomass Leptospira ferrophilum on the surface of the activated carbon was used. The temperature of the reactor was 37°C, the total capacity of the fluidized bed reactor was 14 1, the capacity of the fluidized bed during fluidization was 9.3 1. The residence time of the solution in the fluidized bed was 3 hours. A pH adjustment unit with a capacity of 70 1 was connected to the fluidized bed, and the residence time of the sludge in said unit was 4.3 minutes. The solution is delivered from the pH adjustment unit to a 2.9m 3 capacity of the precipitation unit, the residence time of the solution in said unit was 2.9 hours.

[0092] The ferrous ion content in the solution introduced into the reactor was 7 g / l and the pumping rate of said solution to the reactor was 3.2 l / h. The total amount of solution passing through the fluidized bed was ...

Embodiment 3

[0095] With the experimental configuration of Example 1, when using CaCO 3 When adjusting the pH of the solution, we get figure 2 The oxidation rate and oxidation efficiency of ferrous ions shown in .

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Abstract

The invention relates to an iron extraction process from an aqueous acid solution containing ferrous ions. The acidic feed solution is first passed to a fluidized bed reactor for the oxidation of the ferrous ions preferably by microbes (Leptospirillum ferriphilum) to give ferric ions, followed by introducing the solution obtained to a concentrator for the precipitation of a compound containing ferric ions from the solution to give solid matter. The final product, i.e. solid matter containing ferric ions, is collected. In the process, the solution to be treated is passed through the fluidized bed at a flow rate sufficient for effective fluidization and mixing in the fluidized bed. Further, an apparatus for performing the iron extraction process is claimed. The carrier for the microbes may be activated carbon.

Description

field of invention [0001] This invention relates to methods of extracting and precipitating iron from aqueous solutions, in particular hydrometallurgical methods. The invention further relates to a device for carrying out said extraction of iron. Background of the invention [0002] Iron plays an important role in hydrometallurgical processes in which sulfide minerals such as pyrite and calcopyrite are dissolved. Due to its inherent frequent and abundant occurrence, iron is always co-existing with valuable metals in ore deposits and will typically be removed during hydrometallurgical processing and acid drainage from the mine to the environment. [0003] Typically, dissolved iron is removed, for example, by chemical precipitation. The use of lime or limestone is known to remove dissolved iron as hydroxide by precipitation, but results in considerable waste gypsum problems. [0004] Another alternative is to use biological iron removal. Biological and chemical iron remova...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00
CPCC02F1/66C02F3/085C02F3/104C02F3/345C02F3/346C02F2003/003C02F2103/10C02F2103/16Y02W10/10C02F1/64
Inventor P·努尔米A·卡克索宁J·普哈卡
Owner TALVIVAARAN KAIVOSOSAKEYHTIO
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