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Iron ion removing method from aluminum sulfate

A technology of iron ion and aluminum sulfate, applied in the direction of aluminum sulfate, aluminum sulfur compounds, etc., can solve the problems of difficult filtration, complicated process technology, fine precipitated particles, etc.

Inactive Publication Date: 2004-11-10
WUHAN CHEM COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resulting precipitate is extremely fine and difficult to filter
Patented technology uses tertiary amine extraction method to remove iron from aluminum sulfate, which is complex and costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 9.6g of ethylenediamine into the reaction flask, add a certain amount of 15% KOH solution, cool the temperature to 10-20°C, and add 24.5g of carbon disulfide dropwise. It is advisable to control the temperature not to exceed 20°C for the rate of addition (time is about 2 hours). After the dropwise addition, the temperature is raised to 40-50°C and the reaction is continued for 0.5-1 hour to obtain an aqueous solution with a precipitant concentration of about 30%. This precipitant does not need to be separated by crystallization and can be used directly.

[0013] Weigh 100g of the prepared aluminum sulfate and dissolve it in 130~150mL of water. At room temperature, add 4~6g of an organic complex precipitant with a concentration of 30%, stir evenly, and a brown precipitate will precipitate out, filter to remove the filter cake, and vacuum the mother liquor. Concentrate and crystallize to obtain white solid Al 2 (SO 4 ) 3 After analysis of iron ions, the concentrati...

Embodiment 2

[0015] Add 17.4 g of p-phenylenediamine into the reaction flask, add 15% NaOH solution, cool the temperature to 5-20° C., and add 24.5 g of carbon disulfide dropwise. After the dropwise addition is completed in about 2 hours, the temperature is raised to 40-60° C., and the reaction is continued for 0.5-1 hour. The resulting precipitant concentration is about 30% aqueous solution. This precipitant does not need to be separated by crystallization and can be used directly.

[0016] Weigh 100g of the prepared aluminum sulfate and dissolve it in 130~150mL of water. At room temperature, add 4~6g of an organic complex precipitant with a concentration of 30%, stir evenly, and a brown precipitate will precipitate out, filter to remove the filter cake, and vacuum the mother liquor. Concentrate and crystallize to obtain white solid Al 2 (SO 4 ) 3 After analysis of iron ions, the concentration of iron ions is between 10 and 50ppm.

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Abstract

The invention relates to an organic complexometry process for removing iron ions in aluminum sulfate comprising the steps of, charging 15% KOH solution into a diamine group compound, cooling down to 5-12 deg. C, dropping carbon sulfide, lifting the reaction solution temperature for continuous reaction 0.5-1 hours to obtain water solution with concentration of settling agents being 30%, charging the product yield into a definite quantity of aluminum sulfate mother liquid, agitating, complexing with ferrum ions to produce water-fast brownish-black organic complex-precipitation article, low ferrum or ferrum-free aluminum sulfate can be obtained through filtering and concentration.

Description

technical field [0001] The invention relates to an organic complexing method for removing iron ions in aluminum sulfate, which belongs to the technical field of chemical industry. Background technique [0002] At present, manufacturers at home and abroad have invested a lot of manpower and material resources to study the removal method of iron ions in aluminum sulfate. If the oxidation precipitation method is used, hydrogen peroxide (H 2 o 2 ), potassium persulfate (K 2 S 2 o 8 ), after divalent iron is oxidized to trivalent iron, limestone is used as a precipitant to remove trivalent iron ions. As a result, a large amount of calcium ions are introduced, and the process is complicated. There are also reports in the literature that using hydrogen peroxide (H 2 o 2 ) After divalent iron is oxidized into trivalent iron, potassium ferricyanide [K 3 Fe(CN) 6 ] and ferric ions to generate a blue precipitate. However, the resulting precipitate particles are extremely fine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74
Inventor 刘安昌邹菁黄少云
Owner WUHAN CHEM COLLEGE
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