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Method for selectively separating iron from hydrochloric acid solution containing ferrous chloride

A technology of ferrous chloride and hydrochloric acid solution, applied in directions such as process efficiency improvement, can solve problems such as high cost of raw materials, complicated iron removal process, etc., achieves reduction of production cost, is beneficial to environmental protection and operator's health, and oxidation speed quick effect

Inactive Publication Date: 2012-09-12
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the existing methods for extracting and separating iron (including ferrous and ferric iron) from hydrochloric acid solution either need to use expensive or toxic oxidants to pre-oxidize ferrous, and then extract and separate, or need to divide it into two steps Extraction, these two iron removal processes are complicated and the cost of raw materials is high

Method used

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  • Method for selectively separating iron from hydrochloric acid solution containing ferrous chloride
  • Method for selectively separating iron from hydrochloric acid solution containing ferrous chloride
  • Method for selectively separating iron from hydrochloric acid solution containing ferrous chloride

Examples

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Embodiment 1

[0029] In this embodiment, the hydrochloric acid solution containing ferrous chloride is steel material hydrochloric acid pickling waste liquid, after adding HCl, in the hydrochloric acid solution, FeCl 2 240 g / L, HCl 160 g / L (4.38M), using this hydrochloric acid solution as the water phase. The organic phase is composed of methyl isobutyl ketone (MIBK) and kerosene, and the volume concentration of methyl isobutyl ketone in the organic phase is 60%. Add 0.5L of aqueous phase and 0.5L of organic phase to figure 1 A mixed solution is formed in the extraction tank shown (the molar ratio of the extractant in the organic phase to the iron ion in the aqueous phase = 2.5:1), and the air passes through the air outlet hole with a diameter of 1 mm on the annular air duct 2 placed in the tank body 1 3 Enter the mixed solution, the air flow rate is 2000ml / min, the reaction is carried out at 25°C, and the reaction time is 50min (the amount of air introduced is: the ferrous chloride in th...

Embodiment 2

[0033] In this example, the water phase is the same as in Example 1, the organic phase is composed of tributyl phosphate (TBP) and cyclohexane, and the volume concentration of tributyl phosphate in the organic phase is 35%. Add 0.33L of aqueous phase and 1.67L of organic phase to figure 1 A mixed solution is formed in the extraction tank shown (the molar ratio of the extractant in the organic phase to the iron ion in the aqueous phase = 3.4:1), oxygen (purity 99%) passes through the aperture on the annular air guide tube 2 placed in the tank body 1 The air outlet 3 with a diameter of 1 mm enters the mixed liquid, the oxygen flow rate is 400ml / min, the reaction is carried out at 25°C, and the reaction time is 50min (the amount of oxygen introduced is: the chlorine in the mixed solution formed by the aqueous phase and the organic phase Ferrous chloride is completely oxidized to 3.4 times the theoretical amount of oxygen required for ferric chloride), after the reaction time expi...

Embodiment 3

[0037] In this example, the aqueous phase is the same as in Example 1, the organic phase is composed of N,N-dimethylheptylhexanamide (N503) and toluene, and the volume of N,N-dimethylheptylhexanamide in the organic phase The concentration is 30%. Add 0.28L of aqueous phase and 1.72L of organic phase to figure 1 A mixed liquid is formed in the extraction tank shown (the molar ratio of the extractant in the organic phase to the iron ion in the aqueous phase = 2.9:1), and the oxygen-enriched gas with an oxygen volume concentration of 30% passes through the annular air duct 2 placed in the tank body 1 The air outlet 3 with a diameter of 2mm on the top enters the mixed liquid, the flow rate of the oxygen-enriched gas is 1700ml / min, the reaction is carried out at 35°C, and the reaction time is 50min (the amount of the oxygen-enriched gas introduced is: the water phase and the organic phase The ferrous chloride in the mixed solution formed is completely oxidized to 6 times of the th...

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Abstract

The invention discloses a method for selectively separating iron from hydrochloric acid solution containing ferrous chloride. The method comprises the following steps of: with hydrochloric acid solution containing ferrous chloride as a water phase, adding the water phase and an organic phase into extraction equipment to form a mixed solution; introducing gas containing oxygen into the mixed solution; simultaneously oxidizing and extracting by stirring, wherein the reaction temperature is 25-40DEG C and the reaction time of each stage of extraction is at least 15 minutes; after the reaction time reaches, stopping stirring and introducing the gas containing the oxygen; standing a reaction solution for at least 3 minutes; and then separating an extraction solution and the organic phase, wherein the mixture ratio of the organic phase to the water phase is in the limit of the mol ratio of an extraction agent in the organic phase to an iron ion in the water phase being (2-5) to 1 and the total introduction quantity of the gas containing the oxygen is 2-10 times the theoretical quantity of the gas containing the oxygen required by complete oxidation of ferrous chloride in the mixed solution into ferric trichloride.

Description

technical field [0001] The present invention relates to the method for separating ferric chloride from ferrous chloride-containing hydrochloric acid solution, and described ferrous chloride-containing hydrochloric acid solution can be the hydrochloric acid pickling liquid of steel material or machining parts, also can be ilmenite ( The main component is FeTiO 3 ) hydrochloric acid leaching solution, the hydrochloric acid leaching solution of ilmenite is the hydrochloric acid solution containing high concentration of iron ions and titanium ions obtained from the leaching process of titanium dioxide by the hydrochloric acid method, or the hydrochloric acid solution containing high concentration of iron ions and low concentration of titanium ions obtained from the leaching process of artificial rutile by the hydrochloric acid method Hydrochloric acid solution. Background technique [0002] Separation of ferric chloride or (and) ferrous chloride from metal chloride-hydrochloric...

Claims

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Application Information

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IPC IPC(8): C22B3/26C22B3/00
CPCY02P10/20
Inventor 李春王小梅梁斌吕莉吴潘马进
Owner SICHUAN UNIV
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