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Process method for extracting and separating iron from industrial waste iron mud and preparing iron oxide red

A technology of industrial waste and process method, which is applied to the improvement of process efficiency, iron oxide/iron hydroxide, iron oxide and other directions, can solve the problems of tail gas treatment, long process route, low quality of iron red, etc., and achieves unique processing method. , The effect of high economic value and high purity

Inactive Publication Date: 2012-10-03
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

[0027] Main component of iron sludge in Huludao Chemical Plant (%): Fe 2 o 3 :73.88; FeO:5.98; Fe:1.07; Others: 19.07

[0028] Dry the iron sludge at 70°C and crush it, then take 40g and put it in the reactor, add 300mL mixed acid (c(H + )=5.45mol / L), react in 80℃ water bath for 30min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge will enter the liquid phase after reacting with the acid, and other incompatible impurities still exist in the form of solid phase. Filtration allows solid-liquid separation, and the dissolution rate of iron (calculated as iron atoms) can reach more than 95%. Add 10g of iron filings to the filtrate, react at 70°C for 1 hour, reduce the ferric ions in the filtrate to ferrous ions, filter, remove the remaining iron filings and recycle. Dissolve 70g of ammonium bicarbonate in 300mL of water, add the ferrous solution dropwise into the ammonium bicarbonate solution, Fe 2+ First with...

Embodiment 2

[0030] Composition of Iron Slime in Qingdao Chemical Plant (%): Fe 2 o 3 : 64.32; FeO: 4.65; Fe: 1.30; Others: 29.73, this is iron sludge with relatively low iron content, so the amount of acid used in the acid dissolution reaction is less.

[0031] Dry the iron sludge at 70°C and crush it, then take 40g and put it in the reactor, add 200mL mixed acid (c(H + )=5.45mol / L), react in 80℃ water bath for 30min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge will enter the liquid phase after reacting with the acid, 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 (in terms of iron atoms) can reach more than 96%. Add 8g of iron filings to the filtrate, react at 70°C for 1 hour, reduce the ferric ions in the filtrate to ferrous ions, filter, remove the remaining iron filings and recycle. Dissolve 60g of ammonium bicarb...

Embodiment 3

[0033] Composition of Iron Slime in Qingdao Chemical Plant (%): Fe 2 o 3 Fe: 86.58; FeO: 5.25; Fe: 1.98; Others: 6.19, this is iron sludge with high iron content, and the content of iron element is relatively large, so the amount of mixed acid used in the acid dissolution reaction is larger and the reaction time is longer .

[0034] Dry the iron sludge at 70°C and pulverize it, then take 40g and place it in the reactor, add 450mL mixed acid (c(H + )=5.45mol / L), react in 80℃ water bath for 50min. Iron oxide, ferrous oxide, iron element and a small amount of acid-soluble impurities in the iron sludge will enter the liquid phase after reacting with the acid, 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 (in terms of iron atoms) can reach more than 93%. Add 14g of iron filings to the filtrate, react at 70°C for 1 hour, reduce the ferric ions in the filtrate to ferrous ions...

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Abstract

The invention discloses a process method for extracting and separating iron from industrial waste iron mud and preparing iron oxide red and relates to a chemical engineering separation method. The process method disclosed by the invention is of a new process for extracting and separating the iron from the industrial waste iron mud and preparing the iron oxide red; the process method comprises four technical operations, and the chemical engineering purpose of not only extracting and separating the iron, but also preparing a high-added value product, namely the iron oxide red; and the four technical operations are respectively as follows: (1) a dilute sulfuric acid-dilute hydrochloric acid mixed acid leaching process of the industrial waste iron mud and an acid leaching solution reduction process; (2) the process for preparing the iron oxide red by enabling a ferrous sulfate solution to react with a carbonate and performing oxidizing roasting on a precipitate intermediate; (3) the process for preparing ammonia sulfate by crystallizing a precipitation solution under the action of an organic solvent; and (4) the process for recovering the organic solvent by evaporation and preparing ammonium chloride by evaporation. The process method disclosed by the invention is suitable for extracting and separating iron element from various iron-containing minerals and industrial waste slag, and by using the process method, valuable components can be comprehensively utilized, and environmental pollution and the waste of resources can be reduced.

Description

technical field [0001] The invention relates to a chemical separation method, in particular to a process for extracting and separating iron from industrial waste iron sludge and preparing 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 on an annual output of 1,000 tons o...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/44C01G49/06C01C1/16
CPCY02P10/20
Inventor 张丽清刘志国袁本福
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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