CN111778375B - Maintenance method for iron notch of Ou metallurgical furnace - Google Patents

Abstract

The invention discloses a maintenance method of an Ou metallurgical furnace taphole, which comprises the following operation steps: 1) selecting anhydrous stemming with quick-drying, rapid-hardening and good performance to block an iron notch, adding 1-2% of silicon nitride and 2-3% of aluminum micro powder into the stemming, improving the slag iron scouring resistance of the stemming, pre-opening the iron notch, accelerating the sintering of the stemming in a pore channel in a baking and temperature raising mode of a channel of the iron notch, further improving the slag iron scouring resistance of the stemming, and controlling the iron tapping amount of a single-furnace iron to be below 450 tons/furnace by controlling the iron tapping interval time; 2) controlling oxygen feeding parameters above the taphole, and stopping oxygen feeding through a tuyere above the taphole; 3) controlling the tapping time, and tapping the slag iron as far as possible; 4) and (3) performing sectional mud beating, wherein the first section is only used for sealing a taphole channel, after the operation is stopped for 10 seconds, after semicoke and coke subside in a cavity at the front end of the taphole, the second section of stemming is started to be beaten to form an initial mud bag, after the operation is stopped for 10 seconds, the third section is beaten, the complete part of stemming is beaten in four sections in sequence, and the mud beating amount of each section is 40L, so that the beaten stemming is ensured to form a stable mud bag in a furnace cylinder.

Description

Maintenance method for iron notch of Ou metallurgical furnace

Technical Field

The invention relates to a maintenance method of an iron notch of an Ou-Meta furnace.

Background

The European furnace ironmaking process is the largest non-blast furnace ironmaking process in the world nowadays, can directly use non-coking coal to produce molten iron, and breaks through the dependence of traditional blast furnace ironmaking on coking coal resources. Has incomparable advantages in environmental protection. However, the height of the charge column in the gasification furnace of the Europe smelting furnace is only about 8 meters, and the height of the charge column is close to 25 meters compared with the height of a 2500 cubic meter blast furnace, and the material is suspended on the liquid level of the slag iron in the gasification furnace and floats up and down along with the liquid level of the slag iron. The fuel of the Ou-Meta furnace is foam coal, and through the repeated shutdown anatomical analysis of the Ou-Meta furnace, the foam coal is pulverized in most gasification processes, and the skeleton effect similar to coke is difficult to form in the furnace. The gas permeability in the furnace hearth is poor, the phenomenon of gas injection similar to a blast furnace is difficult to form after the molten iron is lower than the liquid level of the iron notch, and at the moment, a piston in the gasification furnace is pressed on the liquid level of the slag iron and is extruded downwards, so that the molten iron on the dead iron layer is extruded out of the iron notch, and secondary iron flow is formed. The semi-coke bed floats up and down and the large iron flow before the opening is blocked makes a mud bag in front of an iron notch channel difficult to form and maintain, stemming thrown into a hearth can float away along with molten iron, a stable and reliable mud bag cannot be formed on the inner wall of the hearth, the depth of the iron notch cannot be ensured, and the normal safe production and the long service life of the Europe and metallurgy furnace are seriously endangered. Therefore, the Ou metallurgical furnace and the traditional COREX furnace process face a worldwide problem. The depth of the tap hole is difficult to maintain, and the refractory life of the tap hole area determines the first generation furnace life of the Europe and metallurgy furnace.

Disclosure of Invention

The invention aims to provide a maintenance method of an Ou-Meta furnace taphole, which can solve the problem that a mud gun of the Ou-Meta furnace taphole is difficult to form.

The invention aims to realize the maintenance method of the iron notch of the Europe smelting furnace, which comprises the following operation steps:

1) selecting anhydrous stemming with good quick-drying and rapid-hardening performances to block an iron notch, adding 1-2% of silicon nitride and 2-3% of aluminum micro powder into the stemming, improving the slag iron erosion resistance of the stemming, reducing the hole expanding speed of the stemming, and accelerating the sintering of the stemming in a pore channel in a manner of baking and temperature raising of a taphole channel through a taphole pre-opening manner, further improving the slag iron erosion resistance of the stemming, and controlling the tapping amount of single-furnace iron to be below 450 tons/furnace by controlling the tapping interval time;

2) controlling oxygen feeding parameters above the taphole, and stopping oxygen feeding through a tuyere above the taphole;

3) controlling the tapping time, and tapping the slag iron as far as possible;

4) the method comprises the steps of adopting subsection mud beating, wherein a first section is only used for sealing a taphole channel, after the operation is stopped for 10 seconds, after semicoke and coke subside in a cavity at the front end of the taphole, beating a second section of stemming to form an initial mud bag, and after the operation is stopped for 10 seconds, beating a third section, beating complete stemming in four sections in sequence, wherein the mud beating amount of each section is 40L, so that the squeezed stemming is ensured to form a stable mud bag in a furnace cylinder, the depth of the taphole is ensured to be stable, and the taphole is safely tapped.

The invention can ensure the depth stability of the iron notch of the Europe smelting furnace, and the safe tapping, and finally achieves the safety and the long service life of the Europe smelting gasification furnace hearth.

Detailed Description

A maintenance method of an Ou metallurgical furnace taphole comprises the following operation steps:

1) selecting anhydrous stemming with good quick-drying and quick-hardening properties to plug an iron hole, wherein 1-2% of silicon nitride and 2-3% of aluminum micro powder are added into the stemming in percentage by weight. The slag iron erosion resistance of the stemming is improved, the hole expanding speed is reduced, the stemming sintering in the pore channel is accelerated in a way of baking and heating the channel of the taphole through the pre-opening of the taphole, the slag iron erosion resistance of the stemming is further improved, and the tapping amount of a single-furnace iron is controlled to be below 450 tons/furnace by controlling the tapping interval time;

2) controlling oxygen feeding parameters above the taphole, and stopping oxygen feeding through a tuyere above the taphole;

3) controlling the tapping time, and tapping the slag iron as far as possible;

4) the method comprises the steps of adopting subsection mud beating, wherein a first section is only used for sealing a taphole channel, after the operation is stopped for 10 seconds, after semicoke and coke subside in a cavity at the front end of the taphole, beating a second section of stemming to form an initial mud bag, and after the operation is stopped for 10 seconds, beating a third section, beating complete stemming in four sections in sequence, wherein the mud beating amount of each section is 40L, so that the squeezed stemming is ensured to form a stable mud bag in a furnace cylinder, the depth of the taphole is ensured to be stable, and the taphole is safely tapped.

Claims (1)

1. A maintenance method of an iron notch of an Ou metallurgical furnace is characterized by comprising the following operation steps:

1) selecting anhydrous stemming with good quick-drying and rapid-hardening performances to block an iron notch, adding 1-2% of silicon nitride and 2-3% of aluminum micro powder into the stemming, improving the slag iron erosion resistance of the stemming, reducing the hole expanding speed of the stemming, and accelerating the sintering of the stemming in a pore channel in a manner of baking and temperature raising of a taphole channel through a taphole pre-opening manner, further improving the slag iron erosion resistance of the stemming, and controlling the tapping amount of single-furnace iron to be below 450 tons/furnace by controlling the tapping interval time;

2) controlling oxygen feeding parameters above the taphole, and stopping oxygen feeding through a tuyere above the taphole;

3) controlling the tapping time, and tapping the slag iron as far as possible;

4) the method comprises the steps of adopting subsection mud beating, wherein a first section is only used for sealing a taphole channel, after the operation is stopped for 10 seconds, after semicoke and coke subside in a cavity at the front end of the taphole, beating a second section of stemming to form an initial mud bag, and after the operation is stopped for 10 seconds, beating a third section, beating complete stemming in four sections in sequence, wherein the mud beating amount of each section is 40L, so that the squeezed stemming is ensured to form a stable mud bag in a furnace cylinder, the depth of the taphole is ensured to be stable, and the taphole is safely tapped.