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Method for extracting and separating iron from industrial waste iron sludge and preparing ferrous sulfate and iron oxide red

A ferrous sulfate and iron separation technology, applied in the direction of ferric sulfate, ferric oxide/ferric hydroxide, ferric oxide, etc., can solve the problems of long process route, tail gas needs to be treated, low quality iron red, etc., and achieve high economic value, Unique processing method, high purity effect

Inactive Publication Date: 2012-09-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantage: longer process route
The disadvantage is that the quality of the obtained iron red is low, and the exhaust gas needs to be treated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Composition of iron sludge in Huludao Chemical Plant (%): Fe 2 o 3 : 73.88; FeO: 5.98; Fe: 1.07; Others: 19.07

[0029] Dry and pulverize the iron sludge at 70°C, take 20g and put it in the reactor, add 100mL of 25% dilute sulfuric acid, and stir and react at 80°C for 30min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge react with sulfuric acid and enter the liquid phase, and other incompatible impurities still exist in the form of solid phase. Then filter to make solid-liquid separation, and the dissolution rate of iron can reach more than 95%. Add 6g of iron filings to the reaction solution, and reduce it at 60°C for 2 hours, so that the Fe in the reaction solution 3+ is reduced to Fe 2+ , filtered to remove unreacted iron filings and recovered for recycling. Add 150mL industrial ethanol again in the filtrate, crystallize 20min after a little stirring, wherein Fe 2+ of FeSO 4 ·7H 2 The form of O crysta...

Embodiment 2

[0031] Composition of Iron Slime in Qingdao Chemical Plant (%): Fe 2 o 3 :64.32; FeO: 4.65; Fe: 1.30; Others: 29.73

[0032] This is iron sludge with relatively low iron content, so less sulfuric acid is used in the sulfuric acid dissolution reaction.

[0033] Dry and pulverize the iron sludge at 70°C, take 20g and put it in the reactor, add 60mL of 25% dilute sulfuric acid, and stir and react at 80°C for 30min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge react with sulfuric acid and enter the liquid phase, and other incompatible impurities still exist in the form of solid phase. Then filter to make solid-liquid separation, and the dissolution rate of iron can reach more than 96%. Add 5g of iron filings to the reaction solution, and reduce it at 60°C for 2 hours, so that the Fe in the reaction solution 3+ is reduced to Fe 2+ , filtered to remove unreacted iron filings and recovered for recycling. Add 90mL indus...

Embodiment 3

[0035] Composition of Iron Slime in Qingdao Chemical Plant (%): Fe 2 o 3 : 86.58; FeO: 5.25; Fe: 1.98; Others: 6.19

[0036] This is iron sludge with high iron content, and the iron content is relatively large, so the amount of sulfuric acid used in the sulfuric acid dissolution reaction is relatively large, and the reaction time is longer.

[0037] Dry and pulverize the iron sludge at 70°C, take 20g and put it in the reactor, add 160mL of 25% dilute sulfuric acid, and stir and react at 90°C for 50min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge react with sulfuric acid and enter the liquid phase, and other incompatible impurities still exist in the form of solid phase. Then filter to make solid-liquid separation, and the dissolution rate of iron can reach more than 95%. Add 7.5g of iron filings to the reaction solution, and reduce it at 60°C for 2.5 hours, so that the Fe in the reaction solution 3+ is reduced to...

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Abstract

The invention discloses a method for extracting and separating iron from industrial waste iron sludge and preparing ferrous sulfate and iron oxide red and relates to a technological method for chemical extraction and separation. The method is an organic solvent effect crystallization process for extracting and separating iron from industrial waste iron sludge and preparing ferrous sulfate and iron oxide red, consists of four technical processes and realizes the chemical goal of extracting and separating iron and preparing ferrous sulfate and iron oxide red. The four technical processes are respectively as follows: 1) a diluted sulfuric acid leaching process of industrial waste iron sludge; 2) an iron crystallization and separation process under the effect of monobasic alcohol serving as organic solvent; 3) an iron oxide red preparation process through reaction between ferrous sulfate solution and ammonium hydrogen carbonate and oxidizing roasting of sediment; and 4) an ammonium sulfate preparation process through evaporative crystallization of sedimentation solution. The method is suitable for extracting and separating iron element from all kinds of iron-containing minerals and industrial waste residues, valuable components are comprehensively utilized and the environmental pollution and the resource wastage are reduced.

Description

technical field [0001] The invention relates to a chemical extraction and separation process, in particular to a method for extracting and separating iron from industrial waste iron sludge and preparing ferrous sulfate and iron red. Background technique [0002] With the development of the chemical industry, the global environment continues to deteriorate, and environmental protection has become the focus of the governments of all countries. Reducing the discharge of three wastes, waste treatment and secondary utilization are common methods to solve environmental problems in the chemical industry. [0003] Iron powder is a commonly used reducing agent. After oxidation, it is discharged as waste in large quantities. Because it looks like black mud, it is commonly called iron mud. The manufacturers that produce iron sludge are mainly dye factories, pharmaceutical factories and chemical factories. Taking iron filings to reduce nitrobenzene to o-toluidine as an example, based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C01G49/06
Inventor 张丽清袁本福刘志国
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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