SIDE-TYPE POWDER TOP BLOWN FURNACE AND METHOD FOR TREATING SAME

Abstract

A side-type powder top blown furnace and method for treating the furnace is disclosed. The furnace includes a cylindrical furnace body, powder material inlet nozzles, a furnace top sample rod, a top blown furnace spray gun, a belt feeding inlet, a branch conveying pipe, a quantitative pneumatic conveying device, a powder material collecting bin, a powder collecting bin feeding inlet and a furnace top cover; the powder material inlet nozzles are symmetrically arranged around a furnace wall of the cylindrical furnace body on the same horizontal plane. The disclosure can solve the problems of large transportation flying loss, large return amount, poor operating environment, harm to the health of operators and the like in the tin smelting process.

Claims

1. A side-type powder top blown furnace, comprising: a cylindrical furnace body (1), powder material inlet nozzles (2), a furnace top sample rod (3), a top blown furnace spray gun (4), a belt feeding inlet (5), a branch conveying pipe (6), a quantitative pneumatic conveying device (7), a powder material collecting bin (8), a powder collecting bin feeding inlet (9) and a furnace top cover (10); the powder material inlet nozzles (2) are symmetrically arranged around a furnace wall of the cylindrical furnace body (1) on the same horizontal plane, and the powder material inlet nozzles (2) are at an angle of 45 degrees with the furnace wall, and the center of the nozzle faces the center line of the furnace bottom; the top of the cylindrical furnace body (1) is provided with a furnace top cover (10), the top blown furnace spray gun (4) passes through the center of the furnace top cover (10) and extends into the bottom of the cylindrical furnace body (1); the furnace top sample rod (3) extends into the bottom of the cylindrical furnace body (1) through the furnace top cover (10); the belt feeding inlet (5) is arranged on the furnace top cover (10); the top of the powder material collecting bin (8) is provided with a powder material collecting bin feeding inlet (9), and the bottom of the powder material collecting bin (8) is connected with the quantitative pneumatic conveying device (7), the quantitative pneumatic conveying device (7) is connected with the powder material inlet nozzle (2) through the branch conveying pipe (6).

2. The top blown furnace of claim 1, wherein the vertical positions of the two symmetrically opposite corresponding nozzles of the powder material inlet nozzles (2) are arranged on the horizontal plane of the slag line with the maximum treatment capacity of the top blown furnace.

3. The top blown furnace of claim 1, wherein the powder material collecting bin feeding inlet (9) receives the powdery tin material and the fine coal of different sections in different sections in the tin smelting process, and the powder material collecting bin feeding inlet (9) respectively corresponds to the powdery materials of different sources.

4. The top brown furnace of claim 1, wherein the powder material collecting bin (8) is further provided with a DCS control system for setting an unit time and a conveying speed, and powdery materials are fed into the powder material collecting bin (8) of powdery materials by means of quantitative pneumatic conveying to complete mixing.

5. The top brown furnace of claim 1, wherein the conveying speed of the quantitative pneumatic conveying device (7) is 10-35 t/h and the conveying pressure is 0.6-0.9 MPa.

6. A method for treating a side-type powder top blown furnace, comprising: setting parameters of DCS control system, feeding a powder tin dust, a powder coal and a powder tin calcine in different sections of tin smelting process into the powder material collecting bin (8) for mixing and storage by means of quantitative pneumatic conveying; in a smelting stage of tin smelting, charging a bottom material into the cylindrical furnace body (1), melting the top blown furnace spray gun (4) to form a molten pool, setting a conveying amount per unit time for the powdery materials stored in the powder material collecting bin (8) through the DCS control system, providing kinetic energy by quantitative pneumatic conveying device (7), uniformly conveying to the powder material feeding nozzles (2) through the branch conveying pipe (6), and then spraying into the cylindrical furnace body (1) through the powder material inlet nozzles (2) for smelting; charging other tin-containing materials, solvents and reduced coals into the cylindrical furnace body (1) through a belt feeding inlet (5) on the furnace top cover (10); stop feeding, entering a reduction stage, start judging the tin and slag discharging stages, and judging a degree of smelting by analyzing slag samples taken by the furnace top sample rod (3) in the smelting process.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly explain that embodiments of the present disclosure or the technical scheme in the prior art, the following brief description will be given of the drawings which are necessary for the description of the embodiment or the prior art, and it will be apparent that, the drawings in the following description are merely embodiments of the present disclosure, and for those skilled in the art, other drawings may be obtained on the basis of the provided drawings without any creative effort.

[0029] FIG. 1 is schematic diagram of the structure of the side-type powder top blown furnace provided by the present disclosure;

[0030] In the drawing: 1—cylindrical furnace body, 2—powder material inlet nozzles (2), 3—furnace top sample rod, 4—top blown furnace spray gun, 5—belt feeding inlet, 6—branch conveying pipe, 7—quantitative pneumatic conveying device, 8—powder material collecting bin, 9—powder collecting bin feeding inlet, 10—furnace top cover.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present disclosure will be described clearly and completely in the following, and it is obvious that the illustrated embodiments are only a part of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by the ordinary person skilled in the art without creative labor fall within the scope of protection of the present disclosure.

Embodiment 1

[0032] The embodiment 1 of the disclosure provides a method for treating a side-type powder top blown furnace, the side-type powder top blown furnace is shown in FIG. 1, and the working flow of the side-type powder top blown furnace is as follows:

[0033] in the tin smelting system, the powdered tin calcine produced by desulfurization in fluidized roaster is Sn 35 wt. %, S 1.1 wt. %, As 0.8 wt. %, H.sub.2O≤3 wt. %, the powdered tin dust produced by fuming enriched tin middlings and tin slag in the fuming furnace is Sn 45 wt. %, Pb 0.2 wt. %, S 0.9 wt. %, As 1.5 wt. %, Fe 2 wt. %, H.sub.2O≤4.5 wt. %, in the process of top-blown furnace smelting, the powdered tin dust collected in the waste heat boiler and electric precipitator of the flue gas treatment system is Sn 38 wt. %, Pb 1.0 wt. %, S 0.75 wt. %, As 1.8 wt. %, Fe 3 wt. %, H.sub.2O≤4.5 wt. %, and other powdered tin materials and pulverized coal from different sources in several tin smelters, the quantitative pneumatic convey device is simultaneously fed into the powder material collecting bin 8 to complete the mixing, wherein the proportion of powdery tin baking sand is 40%, the proportion of dust of powdery fuming furnace is 30%, the proportion of dust of powdery top blowing furnace is 20%, and fine coal accounts for 10%.

[0034] In the feeding stage of ϕ 5 m top blown furnace, firstly, the material is fed into the bottom material by the belt feeding inlet 5, and then the bottom material is melted by the top blown furnace spray gun 4 to form a molten pool, when the depth of the molten pool reaches 500 mm, the normal feeding stage begins. The conveying pressure of the quantitative pneumatic conveying device 7 is adjusted to be 0.7 MPa, and the unit conveying amount is 30 t/h, after the material flows through the branch conveying pipe 6, the powder material is injected into the molten pool through four nozzles 2, respectively. Other materials containing tin ≥35 wt. %, returning raw coal and solvent are mixed, the feeding speed is controlled by DCS control system, the belt feeding inlet 5 is transported by belt and put into the furnace, and the whole feeding is over the range, and the top blown furnace spray gun 4 are in the melting lance position to continuously provide heat to the furnace.

[0035] When the accumulated amount of all tin-containing materials reaches 90 t, the single feeding process is finished, the pneumatic conveying and feeding of powdered tin materials and the belt feeding inlet 5 feeding of other tin materials are stopped, and the top blowing furnace enters the smelting stage. However, the nozzle is still in the spraying state without loading material, and the spraying air volume is adjusted to the minimum value. In the smelting process, the reduced raw coal is continuously put into the furnace to maintain the reducing atmosphere by controlling the feeding rate of the belt feeding inlet 5, and the furnace top sample rod 3 is placed at certain intervals, and the opportunity to enter the strong reduction stage is determined by observing the slag sample entrained with raw materials by the furnace top sample rod 3. In the strong reduction stage, increase the input amount of return coal, after reduction for a certain period of time, take slag samples from the furnace top sample rod 3 at the bottom of the furnace top, rapidly analyze the tin content in the slag, and when the Sn content of the slag sample taken out is less than 5%, enter the tin releasing stage, after the single-furnace smelting process is completed, the next furnace period is entered.

Embodiment 2

[0036] The embodiment 2 provided by the present disclosure provides a method for side-feeding powder into a top-blowing furnace, and the working flow is as follows:

[0037] in the tin smelting system, the powdered tin calcine produced by desulfurization in fluidized roaster is Sn 38 wt. %, S 0.86 wt. %, As 1.0 wt. %, H.sub.2O≤2 wt. %, the powdered tin dust produced by fuming rich tin middlings and tin slag in the fuming furnace is Sn 42 wt. %, Pb 0.5 wt. %, S 0.8 wt. %, As 2.0 wt. %, Fe 3.5 wt. %, H.sub.2O≤4.0 wt. %, in the process of top-blown furnace smelting, the powdered tin dust collected from waste heat boiler and electric precipitator of flue gas treatment system includes Sn 40 wt. %, Pb 2.1 wt. %, S 0.68 wt. %, As 1.5 wt. %, Fe 3.6 wt. %, H.sub.2O≤5 wt. %, and other powdered tin materials and pulverized coal from different sources in several tin smelters, in the disclosure, the correspond quantitative pneumatic conveying device is simultaneously fed into the powdery material collect bin 8 to complete the mixing, wherein the powdery tin calcine accounts for 45%, the powdery fuming furnace dust 25%, and the powdery top blowing furnace dust 22%, pulverized coal accounts for 8%.

[0038] In the feeding stage of ϕ 5 m top blown furnace, firstly, the material is fed into the bottom material by the belt feed inlet 5, and then the bottom material is melted by the top-blown furnace spray gun 4 to form a molten pool, when the depth of the molten pool reaches 500 mm, the normal feeding stage begins. The conveying pressure of the quantitative pneumatic conveying device 7 is adjusted to be 0.8 MPa, and the unit conveying amount is 20 t/h, after the material is divided by the branch conveying pipe 6, the powder material is injected into the molten pool through four injection nozzles 2. Other materials containing tin ≥35 wt. %, returning raw coal and solvent are mixed, the feeding speed is controlled by DCS control system, the belt feeding inlet 5 is transported by belt and put into the furnace, and the whole feeding is over the range, and the top blown furnace spray gun 4 are in the melting lance position to continuously provide heat to the furnace.

[0039] When the accumulated amount of all tin-containing materials reaches 60 t, the single feeding process is finished, the pneumatic conveying and feeding of powdered tin materials and the belt feeding inlet 5 feeding of other tin materials are stopped, and the top blowing furnace enters the smelting stage. However, the spray nozzle is still in the spray state of no load, and the spray air volume is adjusted to the minimum value. In the smelting process, the reduced raw coal is continuously put into the furnace to maintain the reducing atmosphere by controlling the feeding rate of the belt feeding inlet 5, and the furnace top sample rod 3 is placed at certain intervals, and the opportunity to enter the strong reduction stage is determined by observing the slag sample entrained with raw materials by the furnace top sample rod 3. In the strong reduction stage, increase the input amount of return coal, after reduction for a certain period of time, take slag samples from the furnace top sample rod 3 at the bottom of the furnace top, rapidly analyze the tin content in the slag, and when the Sn content of the slag sample taken out is less than 5%, enter the tin releasing stage, and the single-furnace smelting process is completed, then enter the next furnace period.

[0040] The foregoing description of the disclosed embodiments enables those skilled in the art to make or use the present disclosure. Many modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments shown herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.