Resource utilization method for iron sludge

A technology of recycling and iron slime, applied in the field of industrial waste recycling, can solve the problems of endangering human health, hazards, occupation, etc., achieve high environmental protection and economic value, and the effect of simple and easy operation

Active Publication Date: 2015-11-04
ZHEJIANG QICAI ECO TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most domestic use iron powder to reduce nitro group to make such compounds. Although this method is simple in process and operation, it will produce a large amount of iron sludge containing organic poisons and difficult to handle.
[0003] A large amount of iron sludge is directly piled up as solid waste, which not only pollutes the environment, but also causes a waste of resources
If the iron slime is not properly treated, it will mainly cause the following hazards: 1. Occupy a large amount of land resources; 2. Under the action of the external environment, the iron slime piled up for a long time will chemically react with the substances in the soil, thereby destroying the soil. structure
3. Iron sludge is directly discharged into rivers, lakes and oceans, wh...

Method used

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  • Resource utilization method for iron sludge

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Experimental program
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Effect test

Embodiment 1

[0039] Raw materials: the reduced iron slime produced in the reduction process of iron powder used in the production of H acid, wherein the nitrous value (the equivalent of amino organic chemicals) is 1.87g / Kg, the water content is 21%, and the iron content is 65% ( by mass of iron oxide).

[0040] Processing steps:

[0041] (1) Wet oxidation: Add 250mL of water and 0.3g of activated carbon to 100g of reduced iron sludge to make a slurry to make a slurry and measure the COD of the clear liquid. Put the slurry in a wet oxidation reaction kettle, keep the temperature in the kettle at 260°C, stir at 300rpm, and the pressure at 5MPa, react for 2 hours and then filter and separate to obtain iron mud cake and filtrate. The COD of the filtrate was detected again, and the calculation showed that the removal rate of organic matter in iron sludge by wet oxidation was 95.23%.

[0042] (2) Pickling: Mix 66mL of 98% sulfuric acid with 466mL of water to make dilute sulfuric acid with a ma...

Embodiment 2

[0053] Raw materials: Iron sludge produced by a water treatment plant Fenton to treat papermaking wastewater. The iron sludge mainly remains organic matter such as lignin, macromolecular carbohydrates, and unsaturated fatty acids. Its water content is 85%, and its iron content is 18% (based on the mass of iron oxide).

[0054] Processing steps:

[0055] (1) Wet oxidation: Take 200g of Fenton iron sludge, add 250mL of water and 0.5g of activated carbon to make a slurry and measure the COD of the clear liquid. Put the beating liquid in the wet oxidation reaction kettle, keep the temperature in the kettle at 230°C, stir at 300rpm, and the pressure is 2MPa. After 1 hour of reaction, the iron mud cake and filtrate are obtained by suction filtration, and the COD of the filtrate is measured. The calculation shows that the wet oxidation treatment has a great impact on The COD removal rate of organic matter in iron sludge is 92.56%.

[0056] (2) Pickling: Mix 37mL of 98% sulfuric aci...

Embodiment 3

[0061] Raw materials: When using Fenton technology to treat printing and dyeing wastewater, chemical sludge with high organic content is produced, mainly containing dyes, sizing, additives, fiber impurities and other substances, and the iron content is 68% (calculated by the mass of iron oxide).

[0062] (1) Wet oxidation: Take 100g of Fenton iron sludge, add 200mL of water and 0.5g of activated carbon to make a slurry and measure the COD of the supernatant. Put it in a wet oxidation reaction kettle, keep the temperature in the kettle at 280°C, stir at 300rpm, and the pressure at 4MPa. After 2 hours of reaction, the iron mud cake and filtrate are separated by suction filtration, and the COD of the filtrate is measured. It can be known by calculation that the removal rate of organic matter in iron sludge by wet oxidation treatment is 93.87%.

[0063] (2) Pickling: 35mL of 98% sulfuric acid mixed with 480mL of water (the mass fraction of sulfuric acid is 21.2%) was added to the ...

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Abstract

The invention discloses a resource utilization method for iron sludge. The resource utilization method comprises the following steps: wet oxidation: pulping and dissolving the iron sludge, and separating to obtain an iron sludge cake after a wet oxidation reaction; acid dissolving: reacting the iron sludge cake through sulfuric acid dissolution to obtain a mixed liquor I; reduction: treating the mixed liquor I through an iron powder reduction method or a gas reduction method to obtain a mixed liquor II, and filtering to obtain a filter liquor and a filter residue; cold crystallization: performing cool crystallization on the filter liquor, and separating to obtain industrial grade FeSO4.7H2O and a ferrous sulfate saturated solution; and preparation of polymerized ferric sulfate: adjusting the pH value of the ferrous sulfate saturated solution to be 1-2, adding an oxidizing agent, and performing a heat preservation stirring reaction at the temperature of 20-30 DEG C for 2-6 h, and concentrating to obtain a polymerized ferrous sulfate solution. According to the resource utilization method for iron sludge provided by the invention, ferrous sulfate and polymerized ferric sulfate are produced by taking the solid waste iron sludge as a raw material, and thus the iron sludge is sufficiently utilized.

Description

technical field [0001] The invention relates to the technical field of industrial waste resource treatment, in particular to a method for resource utilization of iron slime. Background technique [0002] At present, there are mainly two sources of domestic iron sludge: 1. Iron sludge produced during the treatment of wastewater by the Fenton method. Compared with the general chemical oxidation method, the Fenton method has unique advantages in the treatment of refractory organic matter. Therefore, this method is often used in industrial wastewater. However, a certain amount of chemical sludge will be produced in the process of treating wastewater by Fenton method, which will cause great harm to human beings and the environment if not properly treated. 2. From the production of amino compounds, most of which are important pharmaceutical, dye, and pesticide intermediates, such as H acid (1-naphthylamine-8-hydroxy-3,6-disulfonic acid monosodium salt), CLT Acid (2-chloro-5-amin...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/20C01G49/14C02F101/30C02F103/36
Inventor 章金骏陈丽娜刘仲明沈振雄赵瑞强张静
Owner ZHEJIANG QICAI ECO TECH CO LTD
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