Reduced iron production method using electrowinning method, and reduced iron produced thereby

Patent metadata

Field	Value
Publication number	US-2019226106-A1
Application number	US-201716315960-A
Country	US
Kind code	A1
Filing date	May 30, 2017
Priority date	Jul 6, 2016
Publication date	Jul 25, 2019
Grant date	—

Abstract

Therefore, by reducing iron oxide through an electrowinning method, a reduced iron in a pure iron state can be obtained. Although it is very difficult to obtain pure iron by refining an iron ore, by using the electrowinning method in which the composition of an electrolyte is controlled and electrolysis conditions are controlled, reduced iron that is pure can be obtained.

First claim

1 . A reduced iron production method using an electrowinning method, comprising,
preparing a mixture by mixing, a solid electrolyte containing sodium peroxide (Na 2 O 2 ) and boron oxide (B 2 O 3 ), with iron oxide (Fe 2 O 3 ); and putting the mixture in an electrowinning device provided with an anode and an insoluble cathode and heating to form a molten oxide and then applying a voltage to the anode and the cathode to form iron on the cathode.

2 . The method of claim 1 , wherein a mixing ratio of the mixture is determined within the region of B:N:F (here, B is boron, N is sodium and F is iron) being 6 to 5:3:1 to on a ternary phase diagram (B 2 O 3 —Na 2 O 2 —Fe 2 O 3 ) of sodium peroxide (Na 2 O 2 ), boron oxide (B 2 O 3 ) and iron oxide (Fe 2 O 3 ).

3 . The method of claim 1 , wherein a mixing ratio of the mixture contains 60 wt % of boron oxide, 30 wt % of sodium peroxide, and 10 wt % of iron oxide.

4 . The method of claim 2 , wherein the ternary phase diagram is determined at 1000° C. and 1 atm.

5 . The method of claim 1 , wherein the insoluble cathode is any one selected from the group consisting of carbon, platinum, tantalum and tungsten.

6 . The method of claim 1 , wherein the heating is performed at a temperature range of 740 to 1100° C.

7 . The method of claim 1 , wherein a voltage difference between the anode and the cathode ranges from 1.5 V to 2.5 V.

8 . The method of claim 1 , wherein the voltage is applied to the anode and the cathode for 3 hours.

9 . The method of claim 1 , wherein iron is reduced at the cathode and is formed in a plate shape.

10 . A reduced iron produced through an electrowinning method, produced by preparing a mixture by mixing, a solid electrolyte containing sodium peroxide (Na 2 O 2 ) and boron oxide (B 2 O 3 ), with iron oxide (Fe 2 O 3 ), and putting the mixture in an electrowinning device provided with an anode and an insoluble cathode and heating to form a molten oxide and then applying a voltage to the anode and the cathode to form reduced iron on the cathode.

11 . The reduced iron of claim 10 , wherein the reduced iron is formed on a surface of the cathode and is formed in a plate shape.

12 . The reduced iron of claim 10 , wherein the reduced iron is formed of a black bottom portion having irregular cracks and a white protruding portion protruding from the bottom portion.

Assignees

• Seoul Nat Univ R&Db Foundation

Inventors

• Yi Kyung-Woo
• Park Jong-Ha
• Choi Ho-Gil

Classifications

• C25C3/34 Primary

  of metals not provided for in groups C25C3/02 - C25C3/32 · CPC title

• C25C7/005

  of cells for the electrolysis of melts (C25C7/02 - C25C7/06 take precedence) · CPC title