# US 2014/0150606 A1 · Method of Manufacturing Direct Reduction Iron and Reduction Firing Apparatus

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2014/0150606 A1
- Document ID: US20140150606A1
- Status: Published application
- Kind: A1
- Application number: 13/909,763
- Filed: 2013-06-04
- Published: 2014-06-05
- Earliest claimed: 2010-09-06
- Assignees: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd.; Pangang Group Co., Ltd.
- Applicants: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd.; Pangang Group Company Ltd.
- Inventors: Jinlong Zhan
- Web page: https://patentgrep.com/patent/US20140150606A1

## CPC

- C21B 13/00: Making spongy iron or liquid steel, by direct processes
- C21B 13/10: in hearth-type furnaces
- C21B 13/146: {Multi-step reduction without melting}
- F27B 9/20: the charge moving in a substantially straight path
- F27B 9/26: on or in trucks, sleds, or containers
- F27B 9/38: Arrangements of devices for charging
- F27B 9/39: Arrangements of devices for discharging
- F27D 3/06: Charging or discharging machines on travelling carriages
- C21B: MANUFACTURE OF IRON OR STEEL (preliminary treatment of ferrous ores or scrap C22B1/00)
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE

## Abstract

A method of manufacturing direct reduction iron and a reduction firing apparatus. The apparatus has a reduction furnace including a left chamber, a right chamber, a material containing device, a step mechanism, a slag distributing device, a charging device, heating burners, a fume extraction path, a charging device, a material receiving tank and a slag discharging path. The method includes the following steps: distributing and charging the slag in the material containing device; carrying and sending the material containing device through a preheating station, a heating station and a reduction station sequentially. Meanwhile, heating the material to be reduced by a combustion of fuel with the heating burners; discharging the reduced material into the material receiving tank; placing the material device from which the material is discharged into the feeding side of the other chamber, then a next work circulation begins.

## Claims

### Claim 1

A method of manufacturing direct reduction iron, which comprises the following steps:
(1) carrying and sending a material containing device into the feeding side of one chamber of a dual-chamber stepping furnace by a discharging device;
(2) transferring the material containing device to a slag distributing station by a step mechanism of the dual-chamber stepping furnace so as to uniformly distribute a layer of slag on grate bars of the material containing device by a slag distributing device;
(3) moving the material containing device forward to a charging station so as to fill the material containing device with pellet material to be heated and reduced;
(4) moving the material containing device forward to a preheating station, a heating station and a reduction station step by step, heating the pellet material by flames of heating burners, fumes of the flames penetrating material layers and the grate bars of the material containing device and being pumped out through a fume extraction path at a bottom of the chamber;
(5) moving the material containing device forward step by step so as to reach a discharging port of the stepping furnace, opening a furnace gate to carry and send the material containing device outside of the furnace by the discharging device, closing the furnace gate, and turning over the material containing device to pour the pellet material reduced into a material receiving tank having a sealing cap; and
(6) turning the material containing device back by the discharging device and the discharging device moving laterally so as to transfer the material containing device into the feeding side of the other parallel chamber of the dual-chamber stepping furnace, and starting the next circulation.

### Claim 2 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the material containing device in the step (1) is a material containing device which has just been baked or from which a high temperature material has just been poured away, thus the material containing device works at a substantial constant temperature.

### Claim 3 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the slag in the step (2) has a particle size larger than a distance between adjacent grate bars of the material containing device, which can effectively prevent reduced material from affecting permeability property of the material containing device due to the adherence thereof to the grate bars of the material containing device after melting; if a reduction temperature required is lower than a molten temperature of the material, the step (2) is omitted and the slag distributing device of the reduction furnace is omitted.

### Claim 4 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the pellet material to be heated and reduced in the step (3) can be replaced by granular material or lump material.

### Claim 5 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the step (3) is carried out by directly pouring the pellet material to be reduced into the material containing device.

### Claim 6 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, further including a step of heating the slag to be distributed in the material containing device in the step (2) and the pellet material to be reduced in the step (3) using the fumes of the reduction furnace outside of the reduction furnace.

### Claim 7 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the fumes of the flames pass through the material layers and is pumped out by the fume extraction path at the bottom of the chamber during heating the pellet material the flames of the heating burners in the step (4) so that the heat of the flames is transferred to the pellet material reduced in two ways of radiation and conduction.

### Claim 8 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the flames of the heating burners in the step (4) are flames generated by burning gas fuel, liquid fuel or solid fuel.

### Claim 9 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the step (4) further includes: controlling the combustions of fuel to be over oxidation combustion or full oxidation combustion at the preheating station and the heating station; controlling the combustion of fuel to be insufficient oxidation combustion at the reduction station.

### Claim 10 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein a reduction temperature and a reduction atmosphere required by reducing the different contents of the pellet material can be obtained through controlling burning flames in the step (4), and a required reduction time can be obtained through setting the number of steps and stepping paces of the step mechanism, thereby making it possible to manufacture non-ferrous material which can be manufactured by a firing reduction method.

### Claim 11 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein pouring the reduced pellet material into the material receiving tank having a sealing cap in step (5) is an intermittent instant operation, and the sealing cap of the material receiving tank can be closed in time.

### Claim 12 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the process of transferring the material containing device into the feeding side of the other parallel chamber of the dual-chamber stepping furnace in the step (6), further includes substituting the material containing device which is damaged or adhered with the molten material, with a new baked material containing device, and repairing the substituted material containing device offline.

### Claim 13 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the material containing device is transferred back and in the feeding side of the present chamber after the material containing device is turned over so that the material containing device can be circled in one chamber.

### Claim 14 (depends on 1)

The method of manufacturing direct reduction iron according to claim 1, wherein the material containing device is directly charged with the material to be reduced, is transferred to the position under the heating burners of reduction furnace by the discharging device, and is stopped under the heating burners; the flames of the heating burners are fired, adjusted and quenched at different time periods, thus the required reduction temperature and the required reduction atmosphere are obtained, and after completing reduction process, the material containing device is carried out of the reduction furnace by the discharging device, then the reduced material are poured into the material receiving tank.

### Claim at position 15

15-24. (canceled)