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Method for preparing ferrous sulfate by reducing iron mud under induction action of solution discharge plasma

A discharge plasma and ferrous sulfate technology, applied in the direction of ferric sulfate, can solve the problems of increased transportation costs, increased production costs, and high iron powder prices, and achieve the effects of short reaction time, low cost, and sufficient raw materials

Inactive Publication Date: 2012-07-04
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the above process is that iron powder is used as reducing agent
On the one hand, the price of iron powder is relatively high now, which increases the production cost; on the other hand, since the addition of iron powder will increase the total amount of iron by one-third after each production, the increased ferrous sulfate cannot be digested internally by the company and can only be sold To other places, due to problems such as scale, the transportation cost increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Platinum is used as the anode material of the solution discharge plasma reactor, and the ratio of the area of ​​the anode electrode to the area of ​​the cathode electrode is 1:100. With phenol as reducing agent, prepare ferrous sulfate heptahydrate according to the following steps.

[0033] (1) Add 10.0 kilograms of dry iron mud (94% iron hydroxide content) in 100L reactor;

[0034] (2) Slowly add a sulfuric acid solution with a concentration of 1.0mol / L under stirring, so that the pH of the solution is between 2.0-2.5;

[0035] (3) add 1.0 kilograms of industrial pure phenol in process (2) solution, stir and dissolve;

[0036] (4) The solution obtained in step (3) is transferred to a solution discharge reactor containing negative and positive electrodes;

[0037] (5) Turn on the power, increase the voltage to 500V, current 15-20A, and react for 20 minutes;

[0038] (6) filter the solution in the reactor in step (5) to remove insoluble impurities;

[0039] (7) Add 1...

Embodiment 2

[0041] Platinum is used as the anode material of the solution discharge plasma reactor, and the ratio of the area of ​​the anode electrode to the area of ​​the cathode electrode is 1:500. With aniline as reducing agent, prepare ferrous sulfate heptahydrate according to the following steps.

[0042] (1) Add 10.0 kilograms of dry iron mud (94% iron hydroxide content) in 100L reactor;

[0043] (2) Slowly add a sulfuric acid solution with a concentration of 2mol / L under stirring, so that the pH of the solution is between 1-3;

[0044] (3) add 1 kilogram of industrial pure aniline in process (2) solution, stir and dissolve;

[0045] (4) The solution prepared in step (3) is transferred to a solution discharge reactor containing negative and positive electrodes;

[0046] (5) Turn on the power, increase the voltage to 550V, the current 15-20A, and the reaction time is 30 minutes;

[0047] (6) filter the solution in the reactor in step (5) to remove insoluble impurities;

[0048] (7)...

Embodiment 3

[0050] Gold is used as the anode material of the solution discharge plasma reactor, and the ratio of the area of ​​the anode electrode to the area of ​​the cathode electrode is 1:1000. Using industrial phenol waste liquid as a reducing agent, the ferrous sulfate is produced by iron slime solution discharge plasma according to the following steps.

[0051] (1) Add 10.0 kilograms of iron mud (91% iron hydroxide content) in 100L reactor;

[0052] (2) Slowly add a sulfuric acid solution with a concentration of 5mol / L under stirring, so that the pH of the solution is between 2.5-3.0;

[0053] (3) Add 50 kilograms of phenol content 2% industrial phenol waste liquids (that is, 1 kilogram of phenol in the waste liquid) to the solution of step (2), stir and dissolve;

[0054] (4) placing the solution prepared in step (3) in a solution discharge reactor containing negative and positive electrodes;

[0055] (5) Turn on the power supply, increase the voltage to 600V, the current is 15-2...

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PUM

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Abstract

The invention relates to a method for preparing ferrous sulfate by reducing iron mud under the induction action of solution discharge plasma, which comprises the following steps: adding iron mud into a reaction kettle, slowly adding sulfuric acid while stirring so as to dissolve the iron mud; adding an organic reducing agent or industrial waste liquor thereof into the obtained solution; transferring the obtained solution into a solution discharge plasma reactor containing a cathode and an anode; switching on the power, raising the voltage to 500-800V and the current to 5-20A, discharging to react for 20-30 minutes; filtering the solution in the reactor to remove insoluble impurities; and concentrating the filtrate to crystallize, thereby obtaining ferrous sulfate heptahydrate or ammonium ferrous sulfate hexahydrate. In the invention, the raw material has wide sources and is sufficient, and the reducing agent can be replaced by industrial organic waste liquor, thereby indirectly treating the organic waste liquor pollution; and the method can effectively recover iron atoms in the iron mud, and thus, can not result in the problems of iron mud accumulation and the like in the process.

Description

technical field [0001] The invention relates to a method for preparing ferrous sulfate, in particular to a method for producing ferrous sulfate by using industrial waste iron sludge as a raw material and organic matter such as phenol as a reducing agent through solution discharge. Background technique [0002] Ferrous sulfate is an important chemical raw material, widely used in water treatment coagulants, catalysts and feed additives. The conventional ferrous sulfate production method can be obtained from the reaction of iron filings with dilute sulfuric acid or by-products in the production of titanium dioxide from ilmenite. [0003] During the use of ferrous sulfate, it is generally directly or indirectly converted into iron sludge (except for feed additives). For example, Fenton's reagent is an effective method for treating refractory organic wastewater [1-2] . In acidic medium, H 2 o 2 Under the action of ferrous sulfate, strong oxidizing hydroxyl radicals are gene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/14
Inventor 刘永军孙冰严志宇朱小梅
Owner DALIAN MARITIME UNIVERSITY