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Method for extracting iron from iron-containing and zinc-containing sludge and preparing iron oxide

A technology of iron oxide and iron hydroxide, which is applied in the direction of iron oxide, iron oxide/iron hydroxide, etc., can solve the problems of not producing much economic value, complex and cumbersome process operation, and low iron concentration, and achieve the elimination of secondary Effects of pollution, protection of ecological environment, and low equipment requirements

Inactive Publication Date: 2018-04-24
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

[0024] Get 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 add sodium hydroxide to adjust the pH at this time. 4. Static and clarified for 300 minutes, filtered to obtain a solution containing iron and zinc.

[0025] 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.

[0026] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0027] After the filter cake was washed, it was baked at 65° C. for 1 hour, dried at 110° C. for 2 hours, and weighed to be 83 g. Grinding it yields high-purity iron oxid...

Embodiment 2

[0029] Get 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 add sodium hydroxide to adjust the pH at this time. 6. Static and clarified for 400 minutes, filtered to obtain a solution containing iron and zinc.

[0030] 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.

[0031] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0032] After washing the filter cake, it was baked at 65° C. for 1 hour, then dried at 110° C. for 2 hours, and weighed to be 87 g. ...

Embodiment 3

[0034] Get 200g of sludge and put it into a 2L beaker, add 2L of hydrochloric acid with a concentration of 20% hydrochloric acid in the iron-containing and zinc-containing sludge to fully dissolve the iron-containing and zinc-containing sludge, and add sodium hydroxide to adjust the pH at this time. 4. Static and clarified for 500 minutes, filtered to obtain a solution containing iron and zinc.

[0035] 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.

[0036] The oxidized zinc-containing iron-containing solution is filtered to obtain a filter cake of ferric hydroxide colloid and a zinc-containing solution.

[0037] After the filter cake is washed, it is dried at 80° C. for 5 hours and ground to obtain high-purity iron oxide.

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Abstract

The invention discloses a method for extracting iron from iron-containing and zinc-containing sludge and preparing iron oxide, and belongs to the field of waste recycling. The method includes adding hydrochloric acid into the iron-containing and zinc-containing sludge, stirring the hydrochloric acid and the iron-containing and zinc-containing sludge, adding alkaline substances into iron-containingand zinc-containing solution at the temperature of 12-35 DEG C, regulating the iron-containing and zinc-containing solution until a PH (potential of hydrogen) value of the iron-containing and zinc-containing solution is 4-7, filling the iron-containing and zinc-containing solution with oxidizing gas and oxidizing the iron-containing and zinc-containing solution at the low temperature for the oxidizing time of 6-7 h; carrying out filtering after ferrous oxide is completely oxidized so as to obtain colloid and drying the colloid at the temperature of 70-100 DEG C to obtain the iron oxide. The method has the advantages that the method is an effective process for recycling the iron from the iron-containing and zinc-containing sludge from hot-galvanizing factories and is low in equipment investment and energy consumption, products prepared by the aid of the method are high in purity, environments can be protected, pollution can be prevented, and the like.

Description

technical field [0001] The invention belongs to the technical field of waste resource treatment, and is characterized in that it relates to a method for extracting iron from sludge containing iron and zinc to prepare iron oxide. Background technique [0002] Iron oxide is an important inorganic non-metallic material with stable chemical properties, high catalytic activity, good light resistance, weather resistance and UV shielding. It is used as an antirust pigment and iron red and purple brown coloring pigment in the paint industry; it is used as a colorant for artificial marble, ground terrazzo, and wall paint in the construction industry; it is used in the preparation of ferrite components in the electronic and telecommunications industry. Important material; in the chemical industry, it is a catalyst and a raw material for the production of other iron-containing chemical products. In addition, it can also be used as raw material of magnetic iron powder, polishing of har...

Claims

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Application Information

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IPC IPC(8): C01G49/06
CPCC01G49/06
Inventor 高波徐宁王艺璇胡成龙邢鹏飞娄太平
Owner NORTHEASTERN UNIV
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