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Method for resource utilization of Fenton iron mud

A technology of resource utilization and iron sludge, applied in chemical instruments and methods, iron sulfate, sludge treatment, etc., can solve problems such as affecting product quality, and achieve the effects of reducing air pollution, simplifying post-processing steps, and saving resources

Active Publication Date: 2016-08-10
ZHEJIANG QICAI ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can recycle Fenton's iron slime, but the organic matter adsorbed on the iron slime still remains in the solution during acidification, and a considerable part of it will be adsorbed in the industrial ferrous sulfate during the crystallization process, affecting product quality

Method used

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  • Method for resource utilization of Fenton iron mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The wastewater from a pesticide factory was treated with Fenton technology to obtain Fenton iron sludge.

[0028] Step 1, in above-mentioned iron slime, add the vitriol oil of 98% while stirring, make Fe(OH) 3 fully reacted to Fe 2 (SO 4 ) 3 , control the pH of the solution to be 1-3 to obtain the iron slime solution, add industrial cooling water, stop adding water when the solubility of iron ions is 87.12g / L, and measure the pH of the solution at this time to be 2, and the COD to be 620mg / L .

[0029] Step 2: The diaphragm electrolyzer with Ru-Ir / Ti as the anode and the graphite plate as the cathode is the electroreduction device, and the diaphragm adopts an anion exchange membrane with a current density of 20mA / cm 2 , transfer the solution obtained in step 1 into the anode reaction chamber for oxidation treatment, react for 1h, measure the COD of the solution to be 60mg / L, reduce the COD of the iron slime solution obtained by the treatment by 90%, and measure the ...

Embodiment 2

[0033] Wastewater from a dye factory was treated with Fenton technology to obtain Fenton iron sludge. It turned out that the factory mainly disposed of the iron sludge through landfill, but after inspection, the Fenton iron sludge buried by the factory seriously affected the local soil and brought secondary pollution.

[0034] Step 1, now take the Fenton iron mud of this factory, and stir while adding 98% concentrated sulfuric acid to make Fe(OH) 3 fully reacted to Fe 2 (SO 4 ) 3 , Control the pH of the solution to be 1-3 to obtain an iron slime solution, add industrial condensed water, stop adding water when the solubility of iron ions is 88.70g / L, at this time, the measured pH of the solution is 1.5, and the COD is 1000mg / L.

[0035] Step 2: The diaphragm electrolyzer with Ru-Ir / Ti as the anode and the graphite plate as the cathode is the electroreduction device, and the diaphragm adopts a cation exchange membrane with a current density of 20mA / cm 2 , transfer the soluti...

Embodiment 3

[0039] The wastewater from a chemical intermediate production enterprise was treated with micro-electrolysis-Fenton to obtain Fenton iron sludge.

[0040] Step 1, now take the Fenton iron mud of this factory, and stir while adding 80% concentrated sulfuric acid, so that Fe(OH) 3 fully reacted to Fe 2 (SO 4 ) 3 , Control solution pH to be 1-3, obtain iron slime solution, add product washing water, stop adding water when the solubility of iron ion is 80g / L, record solution pH this moment and be 1, COD is 6000mg / L.

[0041] Step 2: The diaphragm electrolyzer with Ru-Ir / Ti as the anode and the graphite plate as the cathode is the electroreduction device, and the diaphragm uses a cation exchange membrane with a current density of 30mA / cm 2 , transfer the solution obtained in step 1 into the anode reaction chamber for oxidation treatment, react for 2 hours, measure the COD to be 4700 mg / L, and measure the total iron ion content to be 79.5 g / L. The anode effluent enters the anode...

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Abstract

The invention discloses a method for resource utilization of Fenton iron mud. The method comprises the following steps: adding sulfuric acid to the Fenton iron mud, converting Fe(OH)3 into Fe2(SO4)3 wholly, adding water to dilute after dissolving until the concentrations of iron ions are 70 to 98g / L to obtain a treatment solution I; adding the obtained treatment solution I to an anode chamber of a diaphragm electrolyzer, carrying out oxidation treatment on organic matters in the Fenton iron mud firstly, and then pumping into a cathode chamber of the diaphragm electrolyzer to carry out electroreduction treatment to obtain an Fe<2+> reducing solution; carrying out concentrated crystallization on the Fe<2+> reducing solution under the protection of an inert gas to prepare an industrial product, namely the ferrous sulfate product. According to the invention, the industrial ferrous sulfate is produced through electroreduction, so that the iron mud is fully subjected to resource utilization.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a resource utilization method for solid waste of iron sludge produced in a Fenton process, and the method can effectively recycle and utilize the Fenton iron sludge. Background technique [0002] In recent years, Fenton oxidation technology can be effectively used to treat industrial wastewater. This technology utilizes Fe under acidic conditions 2+ and H 2 o 2 The reaction produces hydroxyl radicals whose oxidative power is only greater than that of F 2 Poor, stronger than general oxidants, able to oxidize a large number of organic compounds into CO 2 and H 2 O, thereby effectively removing organic matter in wastewater. The effluent after Fenton treatment is generally adjusted to neutral or weakly alkaline by adding alkali, and a certain flocculant is added to make iron coagulate in the form of ferric hydroxide, and the Fe(OH) 3 Separated from solution. At the same ti...

Claims

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Application Information

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IPC IPC(8): C02F11/00C01G49/14C02F101/30C02F101/20
CPCC01G49/14C02F11/00C02F11/006C02F11/008C02F2101/203C02F2101/30
Inventor 王雯婷郭晓峰吕伏建
Owner ZHEJIANG QICAI ECO TECH CO LTD
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