Method for extracting humic acid liquid fertilizer and inorganic iron fertilizer from Fenton's iron slime

A technology of humic acid and liquid fertilizer, applied in organic fertilizers, fertilization devices, fertilizer mixtures, etc., can solve problems such as difficulty in filtration, and achieve the effects of simple process operation, promotion of activity, and reduction of empty shell rate.

Inactive Publication Date: 2017-11-10
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Description
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the existing iron sludge treatment methods, to provide a partial solution to the problem of sludge filtration difficulties in the existing sludge reuse method, and to extract humic acid liquid fertilizer and inorganic iron fertilizer from sludge Methods

Method used

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  • Method for extracting humic acid liquid fertilizer and inorganic iron fertilizer from Fenton's iron slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] The main indicators of Fenton iron slime in a paper mill are shown in the table below.

[0022] Table 1 Main indicators of sludge in a sewage treatment plant

[0023] sample

[0024] Table 2 Chemical composition of sludge

[0025] sample

[0026] Table 3 The remaining heavy metal content in the sludge (mg / g sludge dry weight)

[0027] sample

[0028] Place the sludge in a beaker, add 0.1mol / L NaOH (10L / kg sludge) to it, stir at a speed of 10 rpm for 6 hours and then centrifuge at a speed of 4000 rpm for 10 Minutes, collect the extract E1. Add 25% sulfuric acid (addition amount: 4L / kg sludge) to the precipitation, stir and extract at 10 rpm in a water bath at 70°C for 0.5 hours, collect the extract and record it as E2. Add reduced iron powder (0.6kg / kg) into the extract E2, and then obtain inorganic iron fertilizer after crystallization, cooling and drying. The organic humic acid foliar fertilizer can be prepared by concentrating the ext...

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Abstract

The invention discloses a method for extracting humic acid liquid fertilizer and inorganic iron fertilizer from Fenton iron sludge. The method includes the steps of 1, adding sodium hydroxide into the Fenton iron sludge, mixing with extracting for 6 hours, and performing centrifugation to obtain supernate as extract E1; 2, adding sulfuric acid into centrifuged sediment obtained in the step 1, and stirring with extracting in a water bath at 70 DEG C for 0.5 hour to obtain extract E2; 3, adding reduced iron powder into the extract E2 obtained in the step 2, and performing crystallizing, cooling and drying to obtain the inorganic iron fertilizer; 4, adding nitric acid into the extract E1 obtained in the step 1 so as to adjust the pH (potential of hydrogen) to neutrality, and performing concentrating to obtain the humic acid liquid fertilizer. The method has the advantages that the organic matters and iron elements in the iron sludge are made effective use and the problem of difficulty in filtering in the iron extraction process is solved.

Description

technical field [0001] The invention relates to the treatment and disposal technology of iron-containing sludge in paper mills, and belongs to the technical field of solid waste treatment. Background technique [0002] The Fenton / Fenton-like oxidation process is a catalytic oxidation technology that has been gradually promoted in recent years. 2+ and Fe 3+ Hydrogen peroxide is catalyzed to generate strong oxidizing hydroxyl radicals (·OH) to oxidize refractory components in wastewater. The homogeneous Fenton technology commonly used today will inevitably produce a large amount of iron-containing sludge. How to dispose of this sludge will determine the feasibility of the Fenton process in the future engineering promotion. After the papermaking wastewater is treated by the Fenton method, a large amount of iron sludge is produced, which contains a large amount of iron and other organic matter. If it is directly discharged, not only the diamine environment, but also a great w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D9/00C05G3/04C05G3/80
CPCC05D9/00C05F11/02C05G3/80
Inventor 朱英王炜亮韩哲邓俊敏
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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