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A Method for Inhibiting Cohesion Loss in Pressurized Fluidized Reduction of Iron Ore Powder

A technology of coagulation loss and iron ore powder, which is applied in the field of suppression of cohesion loss during pressurized fluidized reduction of iron ore powder, can solve the problem of continuous operation of the process, low reduction rate, reduction speed and low production efficiency To achieve the effect of avoiding mutual hooking and agglomeration, increasing the gas-solid contact area, and accelerating the gas-solid reaction rate

Active Publication Date: 2018-02-23
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, iron ore fines are prone to cohesion and flow loss during the high-temperature fluidized reduction process, which reduces the reduction efficiency and hinders the continuous operation of the process. This has become the most important obstacle to the industrial application of fluidized ironmaking technology.
In order to maintain normal operation, operating at low temperature below 650°C, high gas velocity and low reduction rate will result in low reduction rate and production efficiency, low gas utilization rate, and increased overall energy consumption of the process

Method used

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  • A Method for Inhibiting Cohesion Loss in Pressurized Fluidized Reduction of Iron Ore Powder
  • A Method for Inhibiting Cohesion Loss in Pressurized Fluidized Reduction of Iron Ore Powder
  • A Method for Inhibiting Cohesion Loss in Pressurized Fluidized Reduction of Iron Ore Powder

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Embodiment 1

[0044] In this embodiment, a method for suppressing cohesion loss when pressurized fluidized iron ore powder is reduced, the iron ore powder is mixed with an anti-adhesive agent to obtain a reaction mixture, the anti-adhesive agent is waste plastic, and the plastic powder is polystyrene. Ethylene; put the reaction mixture into the fluidized reaction device, and feed N into the fluidized reaction device at a temperature of 800-900°C 2 Or inert gas, iron ore powder and anti-sticking agent are mixed, wrapped, and pre-cracked in the fluidized reaction device; then the reduction pressure of the fluidized reaction device rises to 0.15-0.30MPa, and the fluidized reaction device cools down to 700-750°C. And filling the reducing gas into the fluidization reaction device to carry out the fluidization reduction of the iron ore powder, and the waste plastics are non-chlorine energetic plastic powders. The detailed description is as follows:

[0045] Step 1: Mix iron ore powder with anti-...

Embodiment 2

[0067] The basic content of this embodiment is the same as that of Embodiment 1, the difference is that: before the wrapping reaction chamber 160 is pushed to the high constant temperature range of 800-900°C, the top of the reaction inner tube 110 is first added with a reaction mixture including iron ore powder and anti-sticking agent material, and blow He gas into the outer casing 120, and the gas flow rate is 0.3-0.5m / s, preferably 0.3m / s, He gas enters the reaction inner tube 110 from the outer casing 120 through the bottom of the outer casing 120 , and push the wrapped reaction chamber 160 of the double-layer tube reaction unit 100 to a low constant temperature range of 300-350°C, the gas drives the reaction mixture to roll in the wrapped reaction chamber 160, and under the action of the air flow guide section 153, the air flow is Cyclical disturbances occur in the wrapping reaction chamber 160, and He gas is blown intermittently to avoid delamination of the anti-adhesive a...

Embodiment 3

[0069] The basic content of this comparative example is the same as that of Example 1. During the reduction process, the pressure of the reaction inner tube 110 was 0.3 MPa, and the reduction time was 50 minutes. No bonding occurred, and the metallization rate was 83.21%. During the reduction process, the anti-sticking agent forms uniform graphite or adhering carbon on the surface of iron ore powder, so as to avoid iron whiskers or iron atoms from interlocking and agglomerating each other, and avoid particle cohesion.

[0070] Example 3

[0071] The basic content of this comparative example is the same as that of Example 1. During the reduction process, the pressure of the reaction inner tube 110 is 0.2 MPa, and the reduction gas contains CO mixed gas, and the mixed gas is 70% CO + 30% N 2 , the reduction time is 40 minutes, no bonding phenomenon occurs, and the metallization rate is 83.05%.

[0072] The anti-sticking agent includes plastic powder, silicon nitride powder and ...

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Abstract

The invention relates to a restraining method for bonding losses during pressurized and fluidized reducing of iron mine powder, and belongs to the technical field of mine powder fluidized reducing. According to the method, the iron mine powder and an anti-bonding agent are mixed, a reaction mixed material is obtained, and the anti-bonding agent comprises waste plastic; the reaction mixed material is added in a fluidizing reaction device, the fluidizing reaction device is inflated with N2 or inert gases at the temperature ranging from 800 DEG C to 900 DEG C, and the iron mine powder and the anti-bonding agent are subjected to mixing, wrapping and the pre-cleavage reaction in the fluidizing reaction device; and then, the reducing pressure of the fluidizing reaction device is increased to 0.15-0.30 MPa, and the fluidizing reaction device is cooled to 700-750 DEG C and is inflated with reducing gas for iron mine powder fluidized reducing. The iron mine powder and the anti-bonding agent are sufficiently mixed in a wrapping reaction cavity, the anti-bonding agent wraps the surface of the iron mine powder, uniform graphite or adhesion carbon is formed on the surface of the iron mine powder through the anti-bonding agent, mutual collecting and clustering of iron whiskers or iron atoms can be avoided, and the bonding losses of the iron mine powder can be restrained.

Description

technical field [0001] The invention belongs to the technical field of ore powder fluidized reduction, and more specifically relates to a method for suppressing cohesion loss during pressurized fluidized reduction of iron ore powder. Background technique [0002] The fluidized bed direct reduction process is a major breakthrough in the field of metallurgy. Since the fluidized bed does not require air permeability, it can directly use iron ore powder that cannot be directly used in blast furnaces and shaft furnaces; the fluidized bed ironmaking process is ironmaking Process energy saving and environmental protection, rational use of domestic low-grade, compound symbiotic ore and solving the problem of tight supply of iron ore resources provide a new smelting approach; the fluidized bed direct reduction process not only expands the source of ironmaking raw materials, but also reduces production costs , Improve the competitiveness of the product. Fluidized bed ironmaking techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
CPCC21B13/0033C21B13/008
Inventor 徐其言王海川何飞王建军
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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