CN107475531B

CN107475531B - Zinc powder recycling system and method

Info

Publication number: CN107475531B
Application number: CN201710726711.0A
Authority: CN
Inventors: 邓富洪
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-08-23
Filing date: 2017-08-23
Publication date: 2023-06-09
Anticipated expiration: 2037-08-23
Also published as: CN107475531A

Abstract

The invention discloses a zinc powder recovery system and a zinc powder recovery method. The invention has reasonable design and simple structure, can realize the cleaning of the blockage of the furnace gas outlet and the zinc powder adhered on the condensing pipe without stopping production, has high and convenient operation safety, greatly improves the production benefit, ensures that the recovery rate of the zinc powder reaches 100 percent, simultaneously removes the impurities and the raw material powder in the zinc-containing flue gas, greatly improves the quality of the zinc powder, can utilize the zinc-containing waste as the raw material, saves resources and is very environment-friendly.

Description

Zinc powder recycling system and method

Technical Field

The invention relates to the field of zinc powder recovery, in particular to a system and a method for recovering zinc powder from zinc-containing waste in zinc-containing flue gas generated by reduction of a smelting furnace.

Background

The production of zinc powder by smelting furnaces in China is from the 70 th century of 20, and is changed from a rectangular arc furnace with 600KVA to a round arc furnace with 800KVA in 2000. By 2006, a round arc furnace of 2000KVA was built. During this time, smelting technology has greatly improved from the initial utilization of single raw calcine to the current utilization of a wide variety of zinc-containing impurities through a range of treatments and formulations. However, the process technology for recovering zinc powder from zinc-containing flue gas obtained by the reduction reaction in a furnace is very backward.

The lag is mainly expressed in the following aspects: 1. the recovery rate of zinc powder is low, and mineral resources are wasted; 2. the content of metal elements in the waste gas is high, and the environment is seriously polluted; 3. the zinc powder recovery process is lag, the zinc powder recovery equipment is simple and crude, and the safety performance is poor; 4. the traditional zinc powder recovery process has low zinc powder recovery benefit; 5. the traditional zinc powder recovery process requires a great deal of labor force, and is inconvenient to operate; 6. the traditional zinc powder recovery process has poor consistency and needs to be frequently stopped for cleaning.

The existing zinc powder recovery method is to install a condenser on a slide rail, an air inlet of the condenser faces a furnace gas outlet of a smelting furnace, so that zinc-containing flue gas reduced in the smelting furnace can directly enter the condenser to be condensed, zinc-containing flue gas which is not recovered by the condenser is continuously sent to a next condenser to be condensed again, and zinc-containing flue gas which is not recovered by the next condenser is sent to a cloth bag dust collector to be treated.

The prior art has a plurality of defects in actual operation:

1. because the temperature of the zinc-containing flue gas discharged from the furnace gas outlet is high to 1050-1100 ℃ at first, and the pressure of the furnace gas outlet reaches 20-30 Pa in order to enable the furnace to normally operate, and the zinc-containing flue gas is a mixed system, and the explosion limit of the mixed system is high when the mixed system is at high temperature and high pressure, explosion accidents often occur during cleaning and powder discharge, and a condenser and a cloth bag dust collection chamber are destroyed, even people or objects are injured;

2. The zinc-containing flue gas directly enters the condenser to be cooled at a high speed, and part of zinc steam can be directly changed into solid zinc blocks, so that spiral conveying is inconvenient. And because the pressure of the zinc-containing flue gas is very big, a little material and impurity in the stove can bring into the condenser along with the flue gas for the quality of powder is influenced, because a condenser is direct to stove gas outlet, so the temperature and the pressure in a condenser are all very high, and the condensation effect is poor, and the zinc powder temperature after condensation is high, only can get into the shale shaker after need waiting to cool.

3. The condensed zinc powder is inconvenient to convey by a screw and a conveyer belt. The hole can only be opened near the bottom of the condenser, and when powder is stored, the powder is put into the closed container from the hole, and after the powder is cooled, the powder is put into the vibrating screen. And a lot of zinc-containing flue gas enters the secondary condenser along with the pressure, and a lot of zinc powder is directly brought into the cloth bag chamber along with the flue gas after the secondary condenser condenses. Under the condition that the cloth bag is not provided with a pressure reducing device, the cloth bag can be inflated by air flow, so that the dust collection effect cannot be achieved, and a part of zinc powder is brought into the air, so that resources are wasted and the air is polluted.

4. The zinc-containing flue gas from the furnace is agglomerated when the flue gas reaches the furnace gas outlet due to cooling, and if the flue gas is not beaten in time, the flue gas can be firmly adhered to the surface of the refractory brick at the furnace gas outlet. In general, the furnace gas outlet is blocked in 5-10 days, so that the pressure in the furnace is continuously increased and dangerous, and the furnace is cleaned, but the only method for cleaning is to break the high pressure of the furnace, pause the production, open a charging hole above the furnace top, discharge the reduced zinc steam and other gases in the furnace from above the furnace top, and pull a condenser away from the furnace gas outlet along a track by using a pulley after reducing the pressure. Then cleaning is started, after the cleaning is finished, the condenser is pushed to the furnace gas outlet for fixation, and the operation is inconvenient and has a plurality of potential safety hazards. Low production benefit, resource waste and air pollution.

5. The condenser pipe in the condenser can be stained with zinc powder and attach on the condenser pipe wall when the condensation, can lose the condensation slowly, in order to clear up the condenser pipe, has also only broken high pressure, pauses production. The condenser is pulled out of the gas port of the furnace, and the gas in the condenser is naturally discharged to a certain time to start cleaning the condenser pipe.

The invention discloses a method for producing zinc powder by treating zinc-containing miscellaneous materials by an electric furnace, as in the Chinese patent No. CN 201110106817.3. Zinc powder is prepared from zinc-containing impurities through the procedures of proportioning the zinc-containing impurities in a quantitative manner, granulating the zinc-containing impurities, roasting the zinc-containing impurities, collecting dust from roasting flue gas, smelting in an electric furnace, condensing zinc powder and collecting dust from smelting flue gas. However, the disadvantage of this patent is that: the method has simple process and equipment when zinc-containing flue gas generated by reduction in an electric furnace is treated to condense and recycle zinc powder, and has the following problems after a period of working:

1. because of the temperature difference between the smelting furnace and the furnace gas outlet, zinc-containing flue gas is blocked at the furnace gas outlet of the smelting furnace due to the cold agglomeration, and production shutdown cleaning is required;

2. The smelting furnace directly conveys zinc-containing flue gas to the condenser, the temperature of the zinc-containing flue gas is very high, the pressure is also very high, the zinc steam condensation effect is very poor, a little impurity and raw material powder in the furnace can be directly brought into the condenser to influence the quality of zinc powder, and the zinc-containing flue gas directly enters the condenser to be cooled at a high speed with a little zinc steam, so that the zinc is directly changed into zinc blocks.

3. The zinc powder condensed by the condenser has very high temperature and cannot directly enter the vibrating screen for screening, and the vibrating screen material screen can be carried out after cooling is needed;

4. when the blockage of the furnace gas outlet is cleaned by stopping production, the condenser needs to be moved away from the furnace gas outlet through the sliding rail, at the moment, cold air is easy to enter into the air inlet of the condenser and is mixed with residual zinc-containing flue gas in the condenser to generate explosion, so that the safety is low;

5. when the zinc powder adhered to the condenser pipe of the condenser is cleaned by stopping production, the condenser is opened, the zinc powder adhered to the condenser pipe needs to be cleaned in the condenser manually, but cold air entering the condenser after the condenser is opened can be mixed with residual zinc-containing flue gas in the condenser to generate explosion, so that the labor cost is high, and the labor safety is low.

6. Because the zinc-containing flue gas directly enters the condenser, the condensing effect is poor, the recovery rate is low, the resource is wasted, and the environment is polluted.

Therefore, a system and a method for recovering zinc powder, which are safe and convenient to operate, energy-saving and environment-friendly, and can improve the recovery rate and quality of zinc powder, are needed.

Disclosure of Invention

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a system for recovering zinc powder and a method thereof. The invention has reasonable design and simple structure, can realize the cleaning of the blockage of the furnace gas outlet and the zinc powder adhered on the condensing pipe without stopping production, has high and convenient operation safety, greatly improves the production benefit, ensures that the recovery rate of the zinc powder reaches 100 percent, simultaneously removes the impurities and the raw material powder in the zinc-containing flue gas, greatly improves the quality of the zinc powder, can utilize the zinc-containing waste as the raw material, saves resources and is very environment-friendly.

In order to achieve the above purpose, the present invention is implemented by adopting the following technical scheme:

a system for recovering zinc powder comprises a smelting furnace, a decompression sedimentation device, a condenser, a gravity sedimentation device and a cloth bag dust collection device,

the smelting furnace is provided with a furnace gas outlet;

the decompression sedimentation device comprises a box body and a box cover, wherein the box cover is arranged on the box body, a decompression sedimentation air inlet and a decompression sedimentation air outlet are formed in the upper portion of the box body, an L-shaped decompression sedimentation channel is formed between the decompression sedimentation air inlet and the decompression sedimentation air outlet, a decompression sedimentation discharge port is formed in the bottom of the box body, a flashboard is arranged on the decompression sedimentation discharge port, the box body comprises an inner layer box body and an outer layer box body, the inner layer box body is arranged in the outer layer box body, a cooling water cavity I is formed between the inner layer box body and the outer layer box body, a cooling water cavity I water outlet pipe is arranged at the top of the outer layer box body, a cooling water cavity I water inlet pipe is arranged at the bottom of the outer layer box body, a cooling water cavity II water inlet pipe and a cooling water cavity II water outlet pipe are arranged in the box cover, and a beating mechanism is arranged on the box body corresponding to the decompression sedimentation air inlet;

The condenser comprises a condensing box, the condensing box is equipped with condensation air inlet and condensation gas outlet, all be equipped with the baffle on four edges of the roof on condensing box upper portion, enclose into the aqua storage tank between baffle and the roof, crisscross distribution has a plurality of condensation mechanism on the condensing box, and every condensation mechanism includes condenser pipe, supporting seat, cold water pipe, through-hole and hollow waterproof seat, the supporting seat suit is on the condenser pipe, and the cold water pipe inserts in the condenser pipe, the through-hole is seted up on the roof, and waterproof seat installs on the through-hole, the supporting seat is installed on waterproof seat, and the condenser pipe passes waterproof seat and through-hole in proper order and stretches into the condensing section in the condensing box, the condensation air inlet is seted up on a lateral wall on the upper portion of condensing box, is equipped with the condensation venthole on the roof on condensing box upper portion, and the intercommunication has the condensation outlet duct on the condensation outlet duct, the baffle is equipped with the drain pipe, and the mounted position of drain pipe is less than the vertical height of waterproof seat.

The gravity sedimentation device comprises two gravity sedimentation boxes, each gravity sedimentation box is provided with a gravity sedimentation air inlet and a gravity sedimentation air outlet, each gravity sedimentation box is internally provided with a baffle plate, the baffle plate forms a curve channel from top to bottom in the gravity sedimentation box, and the gravity sedimentation air outlet of the first gravity sedimentation box is communicated with the gravity sedimentation air inlet of the second gravity sedimentation box;

The cloth bag dust collection device comprises a cloth bag dust collection chamber and an air inlet box, wherein the air inlet box is arranged below the cloth bag dust collection chamber, four air outlet pipes are communicated with the top of the air inlet box, a material collecting pipe is communicated with the bottom of the air inlet box, a butterfly valve I is arranged on the material collecting pipe, an air supply pipe is communicated with the middle of the air inlet box, a butterfly valve II is arranged on the air supply pipe, two cloth bag groups which are arranged in parallel are arranged in the cloth bag dust collection chamber, each cloth bag group consists of two cloth bags, one end of each cloth bag is fixed at the top of the cloth bag dust collection chamber to form a sealed end, the other end of each cloth bag is sleeved on one air outlet pipe, and the cloth bag dust collection chamber is provided with an exhaust pipe;

the furnace gas outlet of the smelting furnace is communicated with a decompression sedimentation air inlet of the decompression sedimentation device, a decompression sedimentation air outlet of the decompression sedimentation device is communicated with a condensation air inlet of a condenser, a condensation air outlet of the condenser is communicated with a gravity sedimentation air inlet of a first gravity sedimentation tank, and a gravity sedimentation air outlet of a second gravity sedimentation tank is communicated with an air inlet tank of the cloth bag dust collecting device through an air supply pipe.

The beating mechanism comprises two beating rods I and two mounting holes formed in the box body, a flexible fireproof sealing sleeve is fixed to each mounting hole, one end of each beating rod I is an operation end, and the other end of each beating rod I sequentially penetrates through the flexible fireproof sealing sleeve, the mounting holes and the decompression sedimentation air inlet and then stretches into a furnace gas outlet of the smelting furnace to form a beating end.

The upper portion of the condensing box is of a double-layer structure, a cooling water cavity III is formed between the inner layer and the outer layer, a cooling water cavity III water inlet pipe and a cooling water cavity III water outlet pipe are arranged on the upper portion of the condensing box, the installation position of the cooling water cavity III water outlet pipe is higher than that of the cooling water cavity III water inlet pipe, the cooling water cavity III water outlet pipe penetrates through the baffle plate to extend into the water storage tank, and the position of a water outlet of the cooling water cavity III water outlet pipe is higher than the vertical height of the waterproof seat.

The lower part of the condensing box is provided with a screw conveyer I, one end of the screw conveyer I is arranged in the lower part of the condensing box to form a feeding end, and the other end of the screw conveyer I extends out of the lower part of the condensing box to form a discharging end.

And vibrators are arranged on two side walls of the lower part of the condensing box.

Screw conveyer II is all installed to the bottom of every gravity sedimentation case, screw conveyer II's one end stretches into the gravity sedimentation incasement and forms the feed end, and screw conveyer II's the other end stretches out the gravity sedimentation case and forms the discharge end.

The screw conveyors II of the two gravity settling tanks are communicated into a whole.

The cloth bag beater is arranged in the cloth bag dust collection chamber and comprises a swinging rod, a limiting block I, a limiting block II and a beating rod II, the beating rod II is arranged on the swinging rod between the two cloth bag groups, one end of the swinging rod extends out of the cloth bag dust collection chamber and is fixed with the limiting block I, the other end of the swinging rod extends out of the cloth bag dust collection chamber and is fixed with the limiting block II, a distance is arranged between the limiting block II and the cloth bag dust collection chamber, and a push-pull rod is connected to the limiting block II.

The spacing between the limiting block II and the cloth bag dust collection chamber is 30cm-50cm.

The invention adopts the connecting pipeline I and the connecting pipeline II to be beneficial to the transportation of smoke.

The number of the condensation mechanisms is 120-300.

A method for recovering zinc dust, comprising the steps of:

pretreatment: zinc-containing flue gas output from a furnace gas outlet of a smelting furnace is sent to a decompression sedimentation device for pretreatment, 1% -3% of zinc steam in the zinc-containing flue gas is condensed and recovered in an L-shaped decompression sedimentation channel of the decompression sedimentation device to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled and condensed in the L-shaped decompression sedimentation channel and then settled in the decompression sedimentation device, and before pretreatment, the temperature of the zinc-containing flue gas is 1050 ℃ -1150 ℃ and the pressure of the zinc-containing flue gas is 20 Pa-25 Pa; after pretreatment, the temperature of the zinc-containing flue gas is 800-900 ℃, and the pressure of the zinc-containing flue gas is 15-20 Pa;

And (3) cooling: then the pretreated zinc-containing flue gas is sent into a condenser for condensation, the residual 97% -99% zinc steam in the zinc-containing flue gas is condensed by the condenser and then recovered to obtain zinc powder, the mixed flue gas containing 5% -10% zinc dust is discharged, the temperature of the mixed flue gas is 35 ℃ -40 ℃, and the pressure of the mixed flue gas is 15 Pa-20 Pa;

and (3) gravity sedimentation: the mixed flue gas discharged from the first cooling step is sent into a gravity sedimentation device, the mixed flue gas continuously passes through two curve channels from top to bottom and then from bottom to top in the gravity sedimentation device, 98% -99% of zinc dust in the mixed flue gas containing 5% -10% of zinc dust is sedimentated and recovered under the action of gravity in the curve channels and baffle plate resistance to obtain zinc powder, and the mixed flue gas containing the residual 1% -2% of zinc dust is discharged;

and (3) bag dust collection: and (3) delivering the mixed flue gas discharged from the gravity sedimentation step into a cloth bag dust collection device, filtering the residual zinc dust in the mixed flue gas by a cloth bag in the cloth bag dust collection device, and then completely recovering to obtain zinc powder, and discharging tail gas.

In the gravity sedimentation step, the sedimentation temperature is normal temperature, and the sedimentation pressure is 10 Pa-15 Pa.

In the cloth bag dust collection step, discharged tail gas is sent into a storage tank for storage through a pipeline. Because the content of carbon monoxide gas in the discharged tail gas is very high, the recycling value is high.

In the cloth bag dust collection step, the discharged tail gas can be sent to a heating part of the coke drying furnace through a pipeline to be ignited, so that heat energy can be provided for the coke drying furnace, the consumption of coal by the coke drying furnace is reduced, the coal cost and the coal resource are saved, and the environment is protected.

Compared with the prior art, the invention has the advantages that:

1. the invention has reasonable design and simple structure, can realize the cleaning of the blockage of the furnace gas outlet and the zinc powder adhered on the condensing pipe without stopping production, has high and convenient operation safety, greatly improves the production benefit, ensures that the recovery rate of the zinc powder reaches 100 percent, simultaneously removes the impurities and the raw material powder in the zinc-containing flue gas, greatly improves the quality of the zinc powder, can utilize the zinc-containing waste as the raw material, saves resources and is very environment-friendly.

2. The decompression sedimentation device comprises a box body and a box cover, wherein the box cover is arranged on the box body, a decompression sedimentation air inlet and a decompression sedimentation air outlet are formed in the upper portion of the box body, an L-shaped decompression sedimentation channel is formed between the decompression sedimentation air inlet and the decompression sedimentation air outlet, a decompression sedimentation discharge hole is formed in the bottom of the box body, a flashboard is arranged on the decompression sedimentation discharge hole, the box body comprises an inner layer box body and an outer layer box body, the inner layer box body is arranged in the outer layer box body, a cooling water cavity I is formed between the inner layer box body and the outer layer box body, a cooling water cavity I water outlet pipe is arranged at the top of the outer layer box body, a cooling water cavity I water inlet pipe is arranged at the bottom of the outer layer box body, a cooling water cavity II water inlet pipe and a cooling water cavity II water outlet pipe are formed in the box cover; zinc-containing flue gas output by a furnace gas outlet of the smelting furnace directly enters a decompression sedimentation device, 1% -3% of zinc steam in the zinc-containing flue gas is condensed by the decompression sedimentation device and then is recovered to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled by an L-shaped decompression sedimentation channel of the decompression sedimentation device and then are settled in the decompression sedimentation device, the materials are discharged through a flashboard control after being collected by the decompression sedimentation device, and the impurities and the raw material powder mixed in the zinc-containing flue gas are removed; the temperature and the pressure of the zinc-containing flue gas entering the condenser are also reduced; the pressure reduction sedimentation device is additionally arranged, so that the temperature and pressure of zinc-containing flue gas output by the furnace gas outlet entering the condenser are reduced, and impurities and raw material powder mixed in the zinc-containing flue gas are removed.

3. The invention adopts the structure that the box body corresponding to the decompression sedimentation air inlet is provided with the beating mechanism, the beating mechanism comprises two beating rods I and two mounting holes arranged on the box body, a flexible fireproof sealing sleeve is fixed on each mounting hole, one end of each beating rod I is an operation end, the other end of each beating rod I sequentially passes through the flexible fireproof sealing sleeve, the mounting holes and the decompression sedimentation air inlet and then stretches into a furnace gas outlet of the smelting furnace to form a beating end, and the beating mechanism in the decompression sedimentation device can clean the blockage of the furnace gas outlet under the condition of no production stopping, so that the complicated process of manually cleaning the blockage of the furnace gas outlet and then re-assembling production is needed in the prior art.

4. The condenser comprises a condensing box, wherein the condensing box is provided with a condensing air inlet and a condensing air outlet, each edge of a top plate at the upper part of the condensing box is provided with a baffle, a water storage tank is enclosed between the baffle and the top plate, a plurality of condensing mechanisms are distributed on the condensing box in a staggered manner, each condensing mechanism comprises a condensing pipe, a supporting seat, a cold water pipe, a through hole and a hollow waterproof seat, the supporting seat is sleeved on the condensing pipe, the cold water pipe is inserted into the condensing pipe, the through hole is formed in the top plate, the waterproof seat is arranged on the through hole, the supporting seat is arranged on the waterproof seat, and the condensing pipe sequentially penetrates through the waterproof seat and the through hole and then stretches into the condensing box to form a condensing section. In the production process, the water seal between the supporting seat and the waterproof seat in the condensing mechanism can be realized by independently pumping out and cleaning each condensing pipe and then inserting the condensing pipes back, because the air pressure in the condenser is higher, cold air can not enter the condenser immediately when the condensing pipes are pumped out, only a baffle plate is needed to be used for blocking, after the condensing pipes are cleaned, the baffle plate is taken off and inserted back into the condensing pipes, the operation is very convenient, the non-stop cleaning is realized, the condition that the prior art needs to manually open the condenser to enter the condenser for cleaning the condensing pipes after stopping production, zinc-containing smoke gas remained in the condenser is discharged when the condenser is opened, resources are wasted, and air pollution is caused is avoided, so that the production efficiency and the cleaning safety are greatly improved, the resources are saved, and the environment is protected.

5. The invention adopts the structure that the condensation air inlet is arranged on one side wall of the upper part of the condensation box, a top plate of the upper part of the condensation box is provided with a condensation air outlet hole, the condensation air outlet hole is communicated with a condensation air outlet pipe, and the condensation air outlet is positioned on the condensation air outlet pipe; the condensing air inlet is formed in one side wall of the upper part of the condensing box, zinc-containing flue gas entering the condenser can flow along a baffling channel formed by the staggered condensing pipes, the zinc-containing flue gas can quickly permeate each corner in the condenser to achieve the highest condensing effect, the problems that in the prior art, a furnace gas outlet is directly communicated with the condensing air inlet of the condenser, the temperature of the zinc-containing flue gas entering the condenser is high, the pressure is high and the impurity is high, the zinc-containing flue gas passes through the condenser in a direct current mode, the condensing pipes at the corners cannot play a role, and the zinc-containing flue gas with high temperature and high pressure can rapidly generate a large amount of zinc blocks when meeting cold in the condenser, so that the recovery rate and quality of zinc powder are seriously influenced are effectively avoided.

6. The upper part of the condensing box is of a double-layer structure, the cooling water cavity III is formed between the inner layer and the outer layer, the upper part of the condensing box is provided with the cooling water cavity III water inlet pipe and the cooling water cavity III water outlet pipe, the installation position of the cooling water cavity III water outlet pipe is higher than that of the cooling water cavity III water inlet pipe, the cooling water cavity III water outlet pipe penetrates through the baffle plate and stretches into the water storage tank, the position of the water outlet of the cooling water cavity III water outlet pipe is higher than the vertical height of the waterproof seat, the cooling water cavity III can further improve the condensing effect of the condenser, the structure is simple, and the position of the water outlet of the cooling water cavity III water outlet pipe is convenient for water circulation of the whole condenser.

7. According to the invention, the screw conveyor I is arranged at the lower part of the condensing box, one end of the screw conveyor I is arranged in the lower box body to form a feeding end, the other end of the screw conveyor I extends out of the lower box body to form a discharging end, the arrangement of the screw conveyor I can collect and convey zinc powder recovered by condensation, the zinc powder can be directly conveyed to the screening machine for direct screening by directly matching with the erection of a plurality of screw conveyors, the problem that zinc powder recovered by the condenser in the prior art cannot be directly screened by the vibrating screen due to high temperature is effectively avoided, the condition that the zinc powder is collected by a sealed barrel first and then naturally cooled, and then manually fed to the vibrating screen for screening is utilized, so that the labor force is saved, the safety is improved, and the production efficiency is greatly improved.

8. The baffle plate is provided with the drain pipe, so that the water in the water storage tank can always seal the gap between the supporting seat and the waterproof seat, the structure is simple, the sealing effect is good, and meanwhile, the installation position of the drain pipe is lower than the vertical height of the waterproof seat, so that the situation that water is poured into the waterproof seat is effectively prevented.

9. According to the invention, the vibrators are arranged on the two side walls of the lower box body, and the vibrators can shake off zinc powder adhered on the inner wall of the condensing box, so that on one hand, the condensing effect of the inner wall of the upper box body of the condensing box is ensured, and on the other hand, zinc powder in the condensing box is shaken into the spiral conveyor I, so that the structure is simple, and the operation is convenient.

10. The gravity sedimentation device comprises two gravity sedimentation boxes, wherein each gravity sedimentation box is provided with a gravity sedimentation air inlet and a gravity sedimentation air outlet, each gravity sedimentation box is internally provided with a baffle plate, the baffle plate forms a curve channel from top to bottom in the gravity sedimentation box, and the gravity sedimentation air outlet of the first gravity sedimentation box is communicated with the gravity sedimentation air inlet of the second gravity sedimentation box; the mixed flue gas passes through a curve channel from top to bottom and then from bottom to top twice in the gravity sedimentation device, 98% -99% zinc dust in the mixed flue gas is sedimentated and recovered in the curve channel under the action of gravity and baffle plate resistance to obtain zinc powder, and the additional arrangement of the gravity sedimentation device is also used for stabilizing the working pressure of a zinc smelting electric furnace and a condenser, so that zinc-containing flue gas entering the condenser fully permeates into each corner of the condenser, and the condensing effect of the condenser is further improved.

11. The invention adopts that the bottom of each gravity settling tank is provided with a screw conveyor II, one end of the screw conveyor II extends into the gravity settling tank to form a feeding end, and the other end of the screw conveyor II extends out of the gravity settling tank to form a discharging end; the arrangement of the screw conveyor II can realize that the screw conveyor II is directly matched with the erection of a plurality of screw conveyors to recover the sedimentation to obtain zinc powder, and the zinc powder is conveyed to the screening machine for direct screening, so that the production efficiency is greatly improved, the screw conveyor II of two gravity sedimentation boxes can be communicated for use, the erection of the screw conveyor is reduced, and the cost is saved.

12. The bag dust collection device comprises a bag dust collection chamber and an air inlet box, wherein the air inlet box is arranged below the bag dust collection chamber, the top of the air inlet box is communicated with four air outlet pipes, the bottom of the air inlet box is communicated with a material collecting pipe, a butterfly valve I is arranged on the material collecting pipe, the middle part of the air inlet box is communicated with an air supply pipe, a butterfly valve II is arranged on the air supply pipe, two bag groups which are arranged in parallel are arranged in the bag dust collection chamber, each bag group consists of two bags, one end of each bag is fixed at the top of the bag dust collection chamber to form a sealed end, the other end of each bag is sleeved on one air outlet pipe, and the bag dust collection chamber is provided with an exhaust pipe; the structure is simple, the recovery effect is obvious, the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collecting device and then is fully recovered to obtain zinc dust, tail gas is discharged, the tail gas can be directly discharged, a butterfly valve on a material collecting pipe is used for sealing and discharging, and the operation is very convenient; the butterfly valve II on the air supply pipe is used for adjusting the system pressure among the smelting furnace, the decompression sedimentation device, the condenser and the gravity sedimentation device, and simultaneously adjusting the indoor pressure of the cloth bag dust collection chamber, so that the recovery effect of the cloth bag is ensured.

13. The cloth bag beater is arranged in the cloth bag dust collection chamber and comprises a swinging rod, a limiting block I, a limiting block II and a beating rod II, wherein the beating rod II is arranged on the swinging rod between two cloth bag groups, one end of the swinging rod extends out of the cloth bag dust collection chamber and is fixed with the limiting block I, the other end of the swinging rod extends out of the cloth bag dust collection chamber 1 and is fixed with the limiting block II, a space is arranged between the limiting block II and the cloth bag dust collection chamber, and a push-pull rod is connected to the limiting block II. The cloth bag beater is arranged, when in beating, the swinging rod is operated to drive the beating rod II to beat back and forth between the two cloth bag groups, and zinc powder adhered to the cloth bag after the cloth bag is beaten falls into the material collecting pipe, so that the recovery effect of the cloth bag is effectively ensured; the push-pull rod can be manually pushed to flap, and the motor can be used for driving the push-pull rod to flap, so that the operation is convenient.

14. The invention also comprises a connecting pipeline I and a connecting pipeline II, wherein the condensation air outlet of the condenser is communicated with the gravity sedimentation air inlet of the first gravity sedimentation tank through the connecting pipeline I, and the gravity sedimentation air outlet of the first gravity sedimentation tank is communicated with the gravity sedimentation air inlet of the second gravity sedimentation tank through the connecting pipeline II.

15. The structure of the invention is applied to a method for recycling zinc powder,

A. the pretreatment step adopts the decompression sedimentation device of the invention, so that zinc powder can be primarily recovered, the temperature and pressure of zinc-containing flue gas output by a furnace gas outlet entering a condenser are reduced, impurities and raw material powder mixed in the zinc-containing flue gas are removed, and the recovery rate and quality of the zinc powder are greatly improved;

B. the condenser is adopted in a cooling step, and each condensing tube can be independently extracted and cleaned and then inserted back in the production process, so that the operation is very convenient, the cleaning without stopping production is realized, the production efficiency and the cleaning safety are greatly improved, resources are saved, the environment is protected, and zinc-containing flue gas can quickly spread at each corner in the condenser to achieve the highest condensing effect, and the conveying is convenient;

C. the gravity sedimentation step adopts the gravity sedimentation device provided by the invention, and the gravity sedimentation device is used for stabilizing the working pressure of the zinc smelting electric furnace and the condenser while sedimentation and recovery of zinc powder, so that zinc-containing flue gas entering the condenser fully permeates into each corner of the condenser, and the condensation effect of the condenser is further improved.

D. The cloth bag dust collection step adopts a cloth bag dust collection device, the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collection device and then is fully recovered to obtain zinc powder, tail gas is discharged, the tail gas containing a large amount of carbon monoxide gas can be recovered and reused, the discharging can be operated through a butterfly valve I, the operation is very convenient, the system pressure among a smelting furnace, a decompression sedimentation device, a condenser and a gravity sedimentation device can be regulated through a butterfly valve II, and meanwhile, the indoor pressure of a cloth bag dust collection chamber is regulated, so that the recovery effect of the cloth bag is ensured.

16. In the cloth bag dust collection step, the discharged tail gas is sent into a storage tank for storage through a pipeline. Because the content of carbon monoxide gas in the discharged tail gas is very high, the recycling value is high.

17. According to the invention, in the cloth bag dust collection step, the discharged mixed tail gas can be sent to the heating part of the coke drying furnace through the pipeline to be ignited, so that heat energy can be provided for the coke drying furnace, the consumption of coal by the coke drying furnace is reduced, the coal cost and the coal resource are saved, and the environment is protected.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention (the reduced pressure sedimentation device has no cover).

Fig. 2 is a schematic structural diagram of the installation position of the water outlet pipe of the cooling water cavity II in the decompression sedimentation device.

Fig. 3 is a schematic structural diagram of a reduced pressure sedimentation air outlet in the reduced pressure sedimentation apparatus of the present invention.

FIG. 4 is a schematic view of the structure of the installation hole in the pressure reducing sedimentation device of the present invention.

Fig. 5 is a schematic structural view of the condenser of the present invention.

Fig. 6 is a schematic view of the structure of the through hole in the condenser of the present invention.

FIG. 7 is a schematic view of the structure of the condensing air outlet pipe in the condenser of the present invention.

Fig. 8 is a schematic diagram of the flow of cooling water to the condensing mechanism in the condenser of the present invention.

FIG. 9 is a schematic view showing the structure of the screw conveyor I in the condenser of the present invention.

FIG. 10 is a schematic view of the structure of the gravity settling device of the present invention (two screw conveyors II are independent).

FIG. 11 is a schematic view of the gravity settling device (two screw conveyors II are connected).

FIG. 12 is a schematic view of a cloth bag dust collector of the invention.

FIG. 13 is a schematic view of a cloth bag beater in the cloth bag dust collector of this invention.

The reference numerals are: 1. smelting furnace 2, decompression sedimentation device 3, condenser 4, gravity sedimentation device 5, cloth bag dust collection device 6, connecting pipeline I, 7, connecting pipeline II, 111, furnace gas outlet; in the decompression sedimentation device: 211. the device comprises a box body, 212, a box cover, 213, a decompression sedimentation air inlet, 214, a decompression sedimentation air outlet, 215, cooling water cavities I and 216, a cooling water cavity I water outlet pipe, 217, a cooling water cavity I water inlet pipe, 218, a cooling water cavity II and 219, a cooling water cavity II water inlet pipe, 220, a cooling water cavity II water outlet pipe, 221, a beating rod I and 222, a mounting hole, 223, a flexible fireproof sealing sleeve, 224, a decompression sedimentation discharge hole, 225 and a flashboard;

In the condenser: 311. the condenser comprises a condenser box, 312, a condenser air inlet, 313, a condenser air outlet, 314, a baffle plate, 315, a condenser pipe, 316, a supporting seat, 317, a cold water pipe, 318, a through hole, 319, a waterproof seat, 320, a condenser air outlet hole, 321, a condenser air outlet pipe, 322, a cooling water cavity III, 323, a cooling water cavity III water inlet pipe, 324, a cooling water cavity III water outlet pipe, 325, a screw conveyor I, 326, a water outlet pipe, 327, a vibrator, a 328 top plate, 329 and cooling water;

in the gravity settling device: 411. a gravity settling tank 412, a gravity settling air inlet 413, a gravity settling air outlet 414, baffle plates 415 and a screw conveyor II;

in the cloth bag dust collection device: 511. the dust collection chamber comprises a cloth bag dust collection chamber 512, an air inlet box 513, an air outlet pipe 514, a material collecting pipe 515, butterfly valves I and 516, an air supply pipe 517, butterfly valves II and 518, a cloth bag 519, an air outlet pipe 520, a swing rod 521, a limiting block I and 522, a limiting block II and 523, a beating rod II and 524 and a push-pull rod.

Detailed Description

The invention is further described below with reference to the accompanying drawings:

example 1:

a system for recovering zinc powder comprises a smelting furnace 1, a decompression sedimentation device 2, a condenser 3, a gravity sedimentation device 4 and a cloth bag dust collection device 5,

The smelting furnace 1 is provided with a furnace gas outlet 111;

the decompression sedimentation device 2 comprises a box body 211 and a box cover 212, the box cover 212 is arranged on the box body 211, a decompression sedimentation air inlet 213 and a decompression sedimentation air outlet 214 are arranged at the upper part of the box body 211, an L-shaped decompression sedimentation channel is formed between the decompression sedimentation air inlet 213 and the decompression sedimentation air outlet 214, a decompression sedimentation discharge hole 224 is arranged at the bottom of the box body 211, a flashboard 225 is arranged on the decompression sedimentation discharge hole 224, the box body 211 comprises an inner layer box body and an outer layer box body, the inner layer box body is arranged in the outer layer box body, a cooling water cavity I215 is formed between the inner layer box body and the outer layer box body, a cooling water cavity I water outlet pipe 216 is arranged at the top of the outer layer box body, a cooling water cavity I water inlet pipe 217 is arranged at the bottom of the outer layer box body, a cooling water cavity II 218 is arranged in the box cover 212, a cooling water cavity II water inlet 219 and a cooling water cavity II water outlet pipe 220 are arranged on the box cover 212, and a beating mechanism is arranged on the box body 211 corresponding to the decompression sedimentation air inlet 213;

the condenser 3 comprises a condensing box 311, the condensing box 311 is provided with a condensing air inlet 312 and a condensing air outlet 313, four edges of a top plate 328 at the upper part of the condensing box 311 are respectively provided with a baffle 314, a water storage tank is enclosed between the baffle 314 and the top plate 328, 120 condensing mechanisms are distributed on the condensing box 311 in a staggered manner, each condensing mechanism comprises a condensing pipe 315, a supporting seat 316, a cold water pipe 317, a through hole 318 and a hollow waterproof seat 319, the supporting seat 316 is sleeved on the condensing pipe 315, the cold water pipe 317 is inserted into the condensing pipe 315, the through hole 318 is formed on the top plate 328, the waterproof seat 319 is arranged on the through hole 318, the supporting seat 316 is arranged on the waterproof seat 319, the condensing pipe 315 sequentially penetrates through the waterproof seat 319 and the through hole 318 and then stretches into the condensing box 311 to form a condensing section, the condensing air inlet 312 is formed on one side wall at the upper part of the condensing box 311, a condensing air outlet hole 320 is formed in the top plate 328 at the upper part of the condensing box 311, a condensing outlet 321 is communicated with a condensing air outlet 321, the air outlet 313 is arranged on the condensing outlet, the air outlet is arranged on the condensing pipe 321, the water outlet pipe 314 is provided with a water outlet pipe 326, and the position of the water outlet pipe 326 is lower than the water-proof seat is arranged at the vertical position;

The gravity settling device 4 comprises two gravity settling tanks 411, wherein each gravity settling tank 411 is provided with a gravity settling air inlet 412 and a gravity settling air outlet 413, each gravity settling tank 411 is internally provided with a baffle plate 414, the baffle plates 414 form a curve channel from top to bottom in the gravity settling tank 411, and the gravity settling air outlet 413 of the first gravity settling tank 411 is communicated with the gravity settling air inlet 412 of the second gravity settling tank 411;

the cloth bag dust collection device 5 comprises a cloth bag dust collection chamber 511 and an air inlet box 512, the air inlet box 512 is arranged below the cloth bag dust collection chamber 511, the top of the air inlet box 512 is communicated with four air outlet pipes 513, the bottom of the air inlet box 512 is communicated with a material collecting pipe 514, a butterfly valve I515 is arranged on the material collecting pipe 514, the middle of the air inlet box 512 is communicated with an air supply pipe 516, a butterfly valve II 517 is arranged on the air supply pipe 516, two cloth bag groups which are arranged in parallel are arranged in the cloth bag dust collection chamber 511, each cloth bag group consists of two cloth bags 518, one end of each cloth bag 518 is fixed at the top of the cloth bag dust collection chamber 511 to form a sealed end, the other end of each cloth bag 518 is sleeved on one air outlet pipe 513, the cloth bag dust collection chamber 511 is provided with an air outlet pipe 519, and a cloth bag beater is arranged in the cloth bag dust collection chamber 511;

The furnace gas outlet 111 of the smelting furnace 1 is communicated with the decompression sedimentation air inlet 213 of the decompression sedimentation device 2, the decompression sedimentation air outlet 214 of the decompression sedimentation device 2 is communicated with the condensation air inlet 312 of the condenser 3, the condensation air outlet 313 of the condenser 3 is communicated with the gravity sedimentation air inlet 412 of the first gravity sedimentation tank 411, and the gravity sedimentation air outlet 413 of the second gravity sedimentation tank 411 is communicated with the air inlet tank 512 of the cloth bag dust collection device 5 through an air supply pipe 516.

In this embodiment, the beating mechanism includes two beating rods i 221 and two mounting holes 222 formed on the box 212, a flexible refractory sealing sleeve 223 is fixed on each mounting hole 222, one end of each beating rod i 221 is an operation end, and the other end of each beating rod i 221 sequentially passes through the flexible refractory sealing sleeve 223, the mounting hole 222 and the decompression sedimentation air inlet 213 and then stretches into the furnace gas outlet 111 of the smelting furnace 1 to form a beating end.

In this embodiment, the flexible refractory gland 223 is an aluminum silicate refractory fiber gland.

In this embodiment, the upper portion of the condensation box 311 is a double-layer structure, a cooling water cavity iii 322 is formed between the inner layer and the outer layer, a cooling water cavity iii water inlet pipe 323 and a cooling water cavity iii water outlet pipe 324 are communicated with the upper portion of the condensation box 311, the installation position of the cooling water cavity iii water outlet pipe 324 is higher than the installation position of the cooling water cavity iii water inlet pipe 323, a water outlet of the cooling water cavity iii water outlet pipe 324 passes through the baffle 314 and stretches into the water storage tank, and the position of the water outlet of the cooling water cavity iii water outlet pipe 324 is higher than the vertical height of the waterproof seat 319.

In this embodiment, a screw conveyor i 325 is disposed at the lower portion of the condensation tank 311, one end of the screw conveyor i 325 is mounted at the lower portion of the condensation tank 311 to form a feeding end, and the other end of the screw conveyor i 325 extends out of the lower portion of the condensation tank 311 to form a discharging end.

In this embodiment, the bottom of each gravity settling tank 411 is provided with a screw conveyor ii 415, one end of the screw conveyor ii 415 extends into the gravity settling tank 411 to form a feeding end, and the other end of the screw conveyor ii 415 extends out of the gravity settling tank 411 to form a discharging end.

In this embodiment, the device further comprises a connecting pipeline i 6 and a connecting pipeline ii 7, the condensation air outlet of the condenser 3 is communicated with the gravity sedimentation air inlet 412 of the first gravity sedimentation tank 411 through the connecting pipeline i 6, the gravity sedimentation air outlet 413 of the first gravity sedimentation tank 411 is communicated with the gravity sedimentation air inlet 412 of the second gravity sedimentation tank 411 through the connecting pipeline ii 7, and the invention adopts the connecting pipeline i 6 and the connecting pipeline ii 7 to facilitate the transportation of flue gas.

When the zinc smelting furnace is used, the zinc smelting furnace is adopted as the smelting furnace, the water orchid powder is granulated and dried and then is sent into the zinc smelting furnace to generate reduction reaction with coke in the zinc smelting furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in mixed smoke discharged from the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and zinc powder is obtained, and the whole system gradually recycles the zinc powder.

Zinc-containing flue gas output from a furnace gas outlet of the zinc smelting electric furnace directly enters a decompression sedimentation device, 1% -3% of zinc steam in the zinc-containing flue gas is condensed by the decompression sedimentation device and then is recovered to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled by an L-shaped decompression sedimentation channel of the decompression sedimentation device and then are settled in the decompression sedimentation device, and thus the impurities and the raw material powder mixed in the zinc-containing flue gas are removed; the temperature and the pressure of the zinc-containing flue gas entering the condenser are also reduced; the decompression sedimentation device is additionally arranged on the traditional process, so that on one hand, the temperature and the pressure of zinc-containing flue gas output by the furnace gas outlet entering the condenser are reduced, and meanwhile, impurities and raw material powder mixed in the zinc-containing flue gas are removed; on the other hand, the plugging material of the furnace gas outlet can be cleaned under the condition of no production stopping by a beating mechanism in the decompression sedimentation device, so that the complicated process of manually cleaning the furnace gas outlet and then reassembling production is avoided under the condition of production stopping in the prior art;

and delivering the zinc-containing flue gas output by the decompression sedimentation device into a condenser for condensation, condensing the residual 97% -99% zinc steam in the zinc-containing flue gas by the condenser, recovering to obtain zinc powder, and discharging mixed flue gas containing 5% -10% zinc dust.

The mixed flue gas containing zinc dust discharged by the condenser continuously passes through two curve channels from top to bottom and then from bottom to top in the gravity settling device, 98% -99% of zinc dust in the mixed flue gas is settled and recovered in the curve channels under the action of gravity and baffle resistance to obtain zinc powder, the recovered zinc powder can be conveyed to the vibrating screen through a screw conveyor II 415 in the gravity settling device, and the additional arrangement of the gravity settling device is also used for stabilizing the working pressure of the zinc smelting electric furnace and the condenser, so that the zinc-containing flue gas entering the condenser fully permeates into each corner of the condenser.

And (3) delivering the mixed flue gas discharged by the gravity settling device into the cloth bag dust collection device, and completely recovering the residual zinc dust in the mixed flue gas after filtering by a cloth bag in the cloth bag dust collection device to obtain zinc powder.

After the system starts to work, the flashboard 225 is opened once every 3-4 hours, and after the materials collected by the decompression sedimentation device are discharged, the flashboard is closed, so that the phenomenon that the whole process is influenced due to excessive accumulation of the materials collected by the decompression sedimentation device can be effectively avoided.

Example 2:

the difference from example 1 is that:

in this embodiment, the flexible refractory sealing sleeve 223 is a graphite packing.

In this embodiment, 180 condensation mechanisms are alternately distributed on the condensation box 311.

In this embodiment, vibrators 327 are disposed on both sidewalls of the lower portion of the condensation box 311.

In this embodiment, the screw conveyors II 415 of the two gravity settling tanks 411 are integrally connected.

When the zinc smelting furnace is used, the zinc smelting furnace is adopted as the smelting furnace, zinc oxide is pretreated and then is sent into the zinc smelting furnace to generate reduction reaction with coke in the zinc smelting furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in mixed smoke discharged by the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and zinc powder is obtained.

Example 3:

the difference from example 1 and example 2 is that:

in this embodiment, 210 condensing mechanisms are alternately distributed on the condensing box 311.

In this embodiment, a cloth bag beater is disposed in the cloth bag dust collection chamber 511, the cloth bag beater includes a swing rod 520, a limiting block i 521, a limiting block ii 522 and a beating rod ii 523, the beating rod ii 523 is mounted on the swing rod 520 between two groups of cloth bags, one end of the swing rod 520 extends out of the cloth bag dust collection chamber 511 and is fixed with the limiting block i 521, the other end of the swing rod 520 extends out of the cloth bag dust collection chamber 511 and is fixed with the limiting block ii 522, a space is provided between the limiting block ii 522 and the cloth bag dust collection chamber 511, and a push-pull rod 524 is connected to the limiting block ii 522.

In this embodiment, the spacing between the limiting block ii 522 and the bag-type dust collection chamber 511 is 30cm.

When the zinc smelting furnace is used, the zinc smelting furnace is adopted as the smelting furnace, the electrolytic zinc scum is pretreated and then sent into the zinc smelting furnace to generate reduction reaction with coke in the zinc smelting furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in mixed smoke discharged by the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and zinc powder is obtained, and the whole system gradually recycles the zinc powder.

Example 4:

the difference from example 1, example 2 and example 3 is that:

in this embodiment, 260 condensing mechanisms are alternately distributed on the condensing box 311.

In this embodiment, the spacing between the limiting block ii 522 and the bag-type dust collection chamber 511 is 40cm.

When the zinc smelting furnace is used, the zinc smelting furnace is adopted as the smelting furnace, zinc-containing pipeline ash of the steel plant is pretreated and then is sent into the zinc smelting furnace to generate reduction reaction with coke in the zinc smelting furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in mixed smoke discharged by the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and zinc powder is obtained.

Example 5:

the difference from example 1, example 2, example 3, example 4 is that:

in this embodiment, 300 condensing mechanisms are alternately distributed on the condensing box 311.

In this embodiment, the spacing between the limiting block ii 522 and the bag-type dust collection chamber 511 is 50cm.

When the embodiment is used, the enrichment furnace is adopted as a smelting furnace, coke powder returned is pretreated and then sent into the enrichment furnace to generate reduction reaction with coke in the enrichment furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in mixed smoke discharged by the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and zinc powder is obtained.

Example 6:

the difference from example 1, example 2, example 3, example 4, and example 5 is that:

when the zinc smelting furnace is used, the zinc smelting furnace is adopted as the smelting furnace, the water orchid powder, zinc oxide, electrolytic zinc scum, zinc-containing pipeline ash and coke powder returned from a steel plant can be pretreated, two or more of the zinc-containing pipeline ash and coke powder returned from the steel plant are mixed and then sent into the zinc smelting furnace to generate reduction reaction with coke in the zinc smelting furnace, zinc-containing smoke containing zinc steam is obtained, zinc powder is obtained after the zinc-containing smoke is recycled through the decompression sedimentation device 2 and the condenser 3, zinc powder dust contained in the mixed smoke discharged from the condenser 3 is recycled through the gravity sedimentation device 4 and the cloth bag dust collection device 5, and the whole system gradually recycles the zinc powder.

Example 7:

a method for recovering zinc dust comprising the steps of:

pretreatment: zinc-containing flue gas output from a furnace gas outlet of a smelting furnace is sent to a decompression sedimentation device for pretreatment, 1% of zinc steam in the zinc-containing flue gas is condensed and recovered in an L-shaped decompression sedimentation channel of the decompression sedimentation device to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled and condensed in the L-shaped decompression sedimentation channel and then settled in the decompression sedimentation device, and before pretreatment, the temperature of the zinc-containing flue gas is 1050 ℃, and the pressure of the zinc-containing flue gas is 20Pa; after pretreatment, the temperature of the zinc-containing flue gas is 800 ℃, and the pressure of the zinc-containing flue gas is 15Pa; and (3) cooling: then the pretreated zinc-containing flue gas is sent into a condenser for condensation, the zinc steam with 99 percent of the residual zinc in the zinc-containing flue gas is condensed by the condenser and then recovered to obtain zinc powder, the mixed flue gas containing 5 percent of zinc dust is discharged, the temperature of the mixed flue gas is 35 ℃, and the pressure of the mixed flue gas is 15Pa;

and (3) gravity sedimentation: feeding the mixed flue gas discharged from the first cooling step into a gravity sedimentation device, continuously passing the mixed flue gas through two curve channels from top to bottom and then from bottom to top in the gravity sedimentation device, settling and recovering 98% zinc dust in the mixed flue gas under the action of gravity in the curve channels and baffle resistance to obtain zinc powder, and discharging the mixed flue gas of the residual 2% zinc dust;

The mixed flue gas discharged from the gravity sedimentation step is sent into a cloth bag dust collection device, and the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collection device and then is recovered to obtain zinc powder, and tail gas is discharged;

in the gravity sedimentation step, the sedimentation temperature is normal temperature, and the sedimentation pressure is 10Pa.

Example 8:

a method for recovering zinc dust comprising the steps of:

pretreatment: zinc-containing flue gas output from a furnace gas outlet of a smelting furnace is sent to a decompression sedimentation device for pretreatment, 2% of zinc steam in the zinc-containing flue gas is condensed and recovered in an L-shaped decompression sedimentation channel of the decompression sedimentation device to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled and condensed in the L-shaped decompression sedimentation channel and then settled in the decompression sedimentation device, and before pretreatment, the temperature of the zinc-containing flue gas is 1100 ℃, and the pressure of the zinc-containing flue gas is 22Pa; after pretreatment, the temperature of the zinc-containing flue gas is 850 ℃, and the pressure of the zinc-containing flue gas is 18Pa; and (3) cooling: then the pretreated zinc-containing flue gas is sent into a condenser for condensation, the residual 98% zinc steam in the zinc-containing flue gas is condensed by the condenser and then recovered to obtain zinc powder, the mixed flue gas containing 7% zinc dust is discharged, the temperature of the mixed flue gas is 37 ℃, and the pressure of the mixed flue gas is 18Pa;

And (3) gravity sedimentation: feeding the mixed flue gas discharged from the first cooling step into a gravity sedimentation device, continuously passing the mixed flue gas through two curved channels from top to bottom and then from bottom to top in the gravity sedimentation device, settling and recovering 98.5% of zinc dust in the mixed flue gas under the action of gravity in the curved channels and baffle plate resistance to obtain zinc powder, and discharging the mixed flue gas with the residual zinc dust of 1.5%;

the mixed flue gas discharged from the gravity sedimentation step is sent into a cloth bag dust collection device, and the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collection device and then is fully recovered to obtain zinc powder, and tail gas is discharged; in the gravity sedimentation step, the sedimentation temperature is normal temperature, and the sedimentation pressure is 13Pa.

In the cloth bag dust collection step, the discharged tail gas is sent into a storage tank for storage through a pipeline. Because the content of carbon monoxide gas in the discharged tail gas is very high, the recycling value is high.

Example 9:

a method for recovering zinc dust comprising the steps of:

pretreatment: zinc-containing flue gas output from a furnace gas outlet of a smelting furnace is sent to a decompression sedimentation device for pretreatment, 3% of zinc steam in the zinc-containing flue gas is condensed and recovered in an L-shaped decompression sedimentation channel of the decompression sedimentation device to obtain zinc powder, impurities and raw material powder mixed in the zinc-containing flue gas are baffled and condensed in the L-shaped decompression sedimentation channel and then settled in the decompression sedimentation device, and before pretreatment, the temperature of the zinc-containing flue gas is 1150 ℃, and the pressure of the zinc-containing flue gas is 25Pa; after pretreatment, the temperature of the zinc-containing flue gas is 900 ℃, and the pressure of the zinc-containing flue gas is 20Pa; and (3) cooling: then the pretreated zinc-containing flue gas is sent into a condenser for condensation, the residual 97% zinc steam in the zinc-containing flue gas is condensed by the condenser and then recovered to obtain zinc powder, the mixed flue gas containing 10% zinc dust is discharged, the temperature of the mixed flue gas is 40 ℃, and the pressure of the mixed flue gas is 20Pa;

And (3) gravity sedimentation: feeding the mixed flue gas discharged from the first cooling step into a gravity sedimentation device, continuously passing the mixed flue gas through two curve channels from top to bottom and then from bottom to top in the gravity sedimentation device, settling and recovering 99% zinc dust in the mixed flue gas under the action of gravity in the curve channels and baffle resistance to obtain zinc powder, and discharging the mixed flue gas of the residual 1% zinc dust;

the mixed flue gas discharged from the gravity sedimentation step is sent into a cloth bag dust collection device, and the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collection device and then is fully recovered to obtain zinc powder, and tail gas is discharged; in the gravity sedimentation step, the sedimentation temperature is normal temperature, and the sedimentation pressure is 15Pa.

In the bag dust collection step, the discharged tail gas can be sent to the heating part of the coke drying furnace through the pipeline to be ignited, so that heat energy can be provided for the coke drying furnace, the consumption of coal by the coke drying furnace is reduced, the coal cost and the coal resource are saved, and the bag dust collection method is very environment-friendly.

When the zinc-containing flue gas treatment system is used, the water orchid powder, zinc oxide, electrolytic zinc scum, zinc-containing pipeline ash and coke powder returned from a steel plant can be pretreated, one or more of the zinc-containing pipeline ash and coke powder are mixed and then put into a zinc smelting electric furnace to be reduced with coke in the zinc smelting electric furnace to generate zinc-containing flue gas containing zinc steam, and the zinc-containing flue gas is treated by the zinc-containing flue gas treatment system of the embodiments 1-6, so that the zinc powder is completely recovered, the quality of the zinc powder is improved, the resources are saved, and the zinc-containing flue gas treatment system is very environment-friendly.

The invention has simple process, safe and convenient operation, can realize cleaning the furnace gas outlet and the condenser pipe without stopping production, greatly improves the production benefit and has high safety.

The present invention is not limited to the above embodiments, the actual number of the condensing mechanisms can be increased or decreased according to the power of the smelting furnace, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zinc powder recovery system, which comprises a smelting furnace (1), a decompression sedimentation device (2), a condenser (3), a gravity sedimentation device (4) and a cloth bag dust collection device (5),

the smelting furnace (1) is provided with a furnace gas outlet (111);

the decompression sedimentation device (2) comprises a box body (211) and a box cover (212), the box cover (212) is arranged on the box body (211), a decompression sedimentation air inlet (213) and a decompression sedimentation air outlet (214) are formed in the upper portion of the box body (211), a decompression sedimentation air outlet (224) is formed in the bottom of the box body (211), a flashboard (225) is arranged on the decompression sedimentation air outlet (224), an L-shaped decompression sedimentation channel is formed between the decompression sedimentation air inlet (213) and the decompression sedimentation air outlet (214), the box body (211) comprises an inner layer box body and an outer layer box body, the inner layer box body is arranged in the outer layer box body, a cooling water cavity I (215) is formed between the inner layer box body and the outer layer box body, a cooling water cavity I water outlet pipe (216) is formed in the top of the outer layer box body, a cooling water cavity I water inlet pipe (217) is formed in the bottom of the outer layer box body, a cooling water cavity II (218) is formed in the box cover (212), a cooling water cavity II (219) and a beating mechanism is arranged on the box body (211) corresponding to the decompression sedimentation air inlet (213);

The condenser (3) comprises a condenser (311), the condenser (311) is provided with a condensing air inlet (312) and a condensing air outlet (313), four edges of a top plate (328) on the upper portion of the condenser (311) are respectively provided with a baffle (314), a water storage tank is enclosed between the baffle (314) and the top plate (328), a plurality of condensing mechanisms are distributed on the condenser (311) in a staggered manner, each condensing mechanism comprises a condensing pipe (315), a supporting seat (316), a cold water pipe (317), a through hole (318) and a hollow waterproof seat (319), the supporting seat (316) is sleeved on the condensing pipe (315), the cold water pipe (317) is inserted into the condensing pipe (315), the through hole (318) is formed on the top plate (328), the supporting seat (316) is arranged on the waterproof seat (319), the condensing pipe (315) sequentially passes through the waterproof seat (319) and the through hole (318) and then stretches into the condenser (311) to form a condensing section, the air inlet (312) is sleeved on the upper portion of the condensing box (311) and is provided with a condensing hole (320) on the upper air outlet pipe (320), the condensation air outlet (313) is arranged on the condensation air outlet pipe (321), the baffle (314) is provided with a drain pipe (326), and the installation position of the drain pipe (326) is lower than the vertical height of the waterproof seat (319);

The gravity sedimentation device (4) comprises two gravity sedimentation boxes (411), each gravity sedimentation box (411) is provided with a gravity sedimentation air inlet (412) and a gravity sedimentation air outlet (413), each gravity sedimentation box (411) is internally provided with a baffle plate (414), the baffle plates (414) form a curve channel from top to bottom to top in the gravity sedimentation box (411), and the gravity sedimentation air outlet (413) of the first gravity sedimentation box (411) is communicated with the gravity sedimentation air inlet (412) of the second gravity sedimentation box (411);

the cloth bag dust collection device (5) comprises a cloth bag dust collection chamber (511) and an air inlet box (512), the air inlet box (512) is arranged below the cloth bag dust collection chamber (511), four air outlet pipes (513) are communicated with the top of the air inlet box (512), a material collecting pipe (514) is communicated with the bottom of the air inlet box (512), a butterfly valve I (515) is arranged on the material collecting pipe (514), an air supply pipe (516) is communicated with the middle of the air inlet box (512), a butterfly valve II (517) is arranged on the air supply pipe (516), two cloth bag groups which are arranged in parallel are arranged in the cloth bag dust collection chamber (511), each cloth bag group consists of two cloth bags (518), one end of each cloth bag (518) is fixed at the top of the cloth bag dust collection chamber (511) to form a sealed end, the other end of each cloth bag (518) is sleeved on one air outlet pipe (513), and the cloth bag chamber (511) is provided with an exhaust pipe (519);

The furnace gas outlet (111) of the smelting furnace (1) is communicated with a decompression sedimentation air inlet (213) of a decompression sedimentation device (2), a decompression sedimentation air outlet (214) of the decompression sedimentation device (2) is communicated with a condensation air inlet (312) of a condenser (3), a condensation air outlet (313) of the condenser (3) is communicated with a gravity sedimentation air inlet (412) of a first gravity sedimentation tank (411), and a gravity sedimentation air outlet 413 of a second gravity sedimentation tank (411) is communicated with an air inlet tank (512) of a cloth bag dust collection device (5) through an air supply pipe (516);

the beating mechanism comprises two beating rods I (221) and two mounting holes (222) formed in the box body (211), a flexible fireproof sealing sleeve (223) is fixed on each mounting hole (222), one end of each beating rod I (221) is an operation end, and the other end of each beating rod I (221) sequentially penetrates through the flexible fireproof sealing sleeve (223), the mounting holes (222) and the decompression sedimentation air inlet (213) and then stretches into a furnace gas outlet (111) of the smelting furnace (1) to form a beating end;

the upper part of the condensing box (311) is of a double-layer structure, a cooling water cavity III (322) is formed between the inner layer and the outer layer, a cooling water cavity III water inlet pipe (323) and a cooling water cavity III water outlet pipe (324) are arranged on the upper part of the condensing box (311), the installation position of the cooling water cavity III water outlet pipe (324) is higher than that of the cooling water cavity III water inlet pipe (323), the cooling water cavity III water outlet pipe (324) penetrates through a baffle (314) to extend into the water storage tank, and the position of a water outlet of the cooling water cavity III water outlet pipe (324) is higher than the vertical height of the waterproof seat (319);

The utility model discloses a cloth bag dust collection device, including cloth bag dust collection chamber (511), cloth bag beater is equipped with the cloth bag beater in, and the cloth bag beater includes swinging rod (520), stopper I (521), stopper II (522) and beating rod II (523), install on swinging rod (520) between two sets of cloth bag group in beating rod II (523), one end of swinging rod (520) stretches out cloth bag dust collection chamber (511) and stopper I (521) fixedly, and the other end of swinging rod (520) stretches out cloth bag dust collection chamber (511) and stopper II (522) fixedly, is equipped with the interval between stopper II (522) and the cloth bag dust collection chamber (511), be connected with push-and-pull rod (524) on stopper II (522).

2. A system for recovering zinc dust as defined in claim 1, wherein: the lower part of the condensing box (311) is provided with a screw conveyor I (325), one end of the screw conveyor I (325) is arranged in the lower part of the condensing box (311) to form a feeding end, and the other end of the screw conveyor I (325) extends out of the lower part of the condensing box (311) to form a discharging end.

3. A system for recovering zinc dust as defined in claim 1, wherein: vibrator (327) are arranged on two side walls of the lower part of the condensing box (311).

4. A system for recovering zinc dust as defined in claim 1, wherein: screw conveyer II (415) are all installed to the bottom of every gravity settling tank (411), the one end of screw conveyer II (415) stretches into in gravity settling tank (411) and forms the feed end, and the other end of screw conveyer II (415) stretches out the outer discharge end of gravity settling tank (411).

5. A system for recovering zinc dust as defined in claim 1, wherein: still include connecting tube I (6) and connecting tube II (7), the condensation gas outlet of condenser (3) is through connecting tube I (6) and the gravity sedimentation air inlet (412) intercommunication of first gravity sedimentation tank (411), and the gravity sedimentation gas outlet (413) of first gravity sedimentation tank (411) is through connecting tube II (7) and the gravity sedimentation air inlet (412) intercommunication of second gravity sedimentation tank (411).

6. A method of recovering zinc powder employed in a system for recovering zinc powder of claim 1, comprising the steps of:

the mixed flue gas discharged from the gravity sedimentation step is sent into a cloth bag dust collection device, and the rest zinc dust in the mixed flue gas is filtered by a cloth bag in the cloth bag dust collection device and then is fully recovered to obtain zinc powder, and tail gas is discharged;