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Method for extracting iron and preparing iron hydroxide from sludge containing iron and zinc

A technology of ferric hydroxide and sodium hydroxide, applied in the direction of ferric oxide/ferric hydroxide, etc., can solve the problems of not producing much economic value, complicated and tedious process operation, low iron concentration, etc., and achieve the elimination of secondary pollution, The effect of protecting the ecological environment and low equipment requirements

Inactive Publication Date: 2018-04-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Its process operation is relatively complicated and cumbersome, and it consumes a lot of energy. For sludge with low iron concentration, it does not produce much economic value.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 200g of sludge and put it into a 2L beaker, add 1500ml of hydrochloric acid with a mass percentage concentration of 7% hydrochloric acid to the iron-containing and zinc-containing sludge to fully dissolve the iron-containing and zinc-containing sludge, and then add sodium hydroxide to adjust the pH value It was 4, statically clarified for 300 minutes, and filtered to obtain a solution containing iron and zinc.

[0026] Oxygen is introduced into the ferrous hydroxide liquid, and the air pressure is 0.5MPa. make part of Fe 2+ is oxidized to Fe 3 + , the oxidation time is 6h, the solution is yellowish brown, then the oxidation is fully completed.

[0027] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0028] After the filter cake was washed, it was air-dried and weighed to be 117g. It can be ground to obtain high-purity ferric hydroxide.

Embodiment 2

[0030] Take 200g of sludge and put it into a 2L beaker, add 1500ml of hydrochloric acid with a mass percentage concentration of 20% hydrochloric acid to the iron-containing and zinc-containing sludge to fully dissolve the iron-containing and zinc-containing sludge, and then add sodium hydroxide to adjust the pH value It was 6, statically clarified for 400 minutes, and filtered to obtain a solution containing iron and zinc.

[0031] Oxygen is introduced into the ferrous hydroxide liquid, and the air pressure is 0.5MPa. make part of Fe 2+ is oxidized to Fe 3 + , the oxidation time is 6h, and the solution turns from light green to yellowish brown, indicating that the oxidation is fully completed.

[0032] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0033] After the filter cake was washed, it was air-dried and weighed to be 125g. It can be ground to obtain high-purity f...

Embodiment 3

[0035] Take 200g of sludge and put it into a 2L beaker, add 2L of hydrochloric acid with a mass percentage concentration of 20% hydrochloric acid to the iron-containing and zinc-containing sludge to fully dissolve the iron-containing and zinc-containing sludge, and then add sodium hydroxide to adjust the pH value It was 4, statically clarified for 500 min, and filtered to obtain a solution containing iron and zinc.

[0036] Air is introduced into the ferrous hydroxide liquid, and the air pressure is 0.6MPa. make part of Fe 2+ is oxidized to Fe 3 + , the solution turns from light green to yellowish brown, indicating that the oxidation is fully completed.

[0037] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0038] After the filter cake was washed, it was air-dried and weighed to be 125g. It can be ground to obtain high-purity ferric hydroxide.

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Abstract

The invention relates to a method for extracting iron and preparing iron hydroxide from sludge containing iron and zinc and belongs to the field of wastes recycling. The method comprises the followingsteps: adding hydrochloric acid into the sludge containing iron and zinc, adding alkaline substances into a solution containing iron and zinc at 12-35 DEG C so as to adjust the pH value to 4-7, simultaneously introducing oxidation gas, and carrying out low-temperature oxidation for 6-7 hours; and obtaining iron hydroxide colloid after ferrous oxide is completely oxidized, and washing, so as to obtain high-purity iron hydroxide. The method is an effective and simple process for recycling iron from the sludge containing iron and zinc in a hot galvanizing factory and has the advantages that theequipment investment is low, the energy consumption is low, the prepared product is high in purity, environment-friendly and pollution-free, and the like.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment, and relates to a method for extracting iron from sludge containing iron and zinc and preparing ferric hydroxide. Background technique [0002] Ferric hydroxide, brown or reddish brown powder or dark brown flocculent precipitate or colloid, amphoteric but its alkalinity is stronger than acidic, and the newly prepared ferric hydroxide is easily soluble in inorganic and organic acids, and also soluble in hot concentrated alkali . With a strong oxidizing agent (such as sodium hypochlorite) in alkaline medium, it can oxidize the newly prepared ferric hydroxide to sodium ferrate Na in the +Ⅵ oxidation state 2 FeO 4 . When heated, it gradually decomposes into iron oxide and water. It is insoluble in water, ether and ethanol, but soluble in acid. The solubility in acid depends on the length of production time. The newly prepared one is easily soluble in acid, but it is difficult to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02
CPCC01G49/02C01P2006/80
Inventor 高波徐宁胡成龙王艺璇邢鹏飞娄太平
Owner NORTHEASTERN UNIV
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