CN212092552U - System for handle metallurgical solid useless moist mill of giving up of preventing caking - Google Patents

Abstract

The utility model discloses a system for handle metallurgical solid useless moist mill of preventing caking material, including wet process dosing unit and moist mill, the system still includes first belt conveyors, second belt conveyors and is used for stirring the premix device of mixture body, the wet process dosing unit is connected with the premix device through first belt conveyors, and the premix device passes through second belt conveyors and is connected with moist mill. The overall goals of continuous operation of the system without material interruption and material reduction and uniform material mixing are realized.

Description

System for handle metallurgical solid useless moist mill of giving up of preventing caking

Technical Field

The utility model belongs to the technical field of smelt solid useless processing, concretely relates to system of preventing caking of wet mill of processing metallurgical solid useless.

Background

Along with the continuous improvement of the production capacity of the steel industry in China, various metallurgical solid hazardous waste materials are generated, and if the solid hazardous waste materials cannot be effectively utilized, the resource loss of the steel enterprise is caused, and the social environment load is increased more seriously.

The rotary hearth furnace is taken as a mature special production line for dezincification of the solid waste of the zinc-containing dust and mud, is rapidly popularized at home and abroad, and has the following treatment material composition: iron-containing low-carbon dedusting ash, zinc-containing blast furnace sludge and iron-containing high-carbon ash. The raw material wet grinding treatment process is a previous process of pelletizing operation, and is mainly used for fully mixing and grinding the iron-containing dedusting ash and dust mud to obtain proper granularity and specific surface area, and the mixture enters a pelletizing disc to roll and fall into pellets. The zinc-containing sludge has high viscosity, is easy to adhere to the inner wall of the moistening and grinding machine in the process of uniformly mixing the zinc-containing sludge, causes intermittent caking, can cause system material breaking in serious cases, reduces production and standby materials, and seriously restricts the stable and low-consumption operation of the system.

The existing production line process flow is to mix materials firstly and then humidify the materials by a humidifier to adjust moisture, however, in the process, the moisture in the humidifier is difficult to control, so that the material blocking phenomenon is easy to occur.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem who exists among the prior art. Therefore, the utility model provides a system for handle metallurgical solid useless wet mill and prevent caking material, the phenomenon of easy putty is solved to the purpose.

In order to realize the purpose, the utility model discloses the technical scheme who takes does:

the utility model provides a system for handle metallurgical solid useless moist mill of preventing caking material, includes wet process dosing unit and moist mill, the system still includes first belt conveyors, second belt conveyors and is used for stirring the premix device of mixture body, the wet process dosing unit passes through first belt conveyors and is connected with the premix device, and the premix device passes through second belt conveyors and is connected with moist mill.

The premix device comprises a shell, a stirring rod arranged in the shell and blades obliquely arranged on the stirring rod.

The blades are inclined upwardly at an angle of 30 deg. relative to the plane of the bottom surface of the housing.

The stirring rods are two, the two stirring rods are parallel to each other and are fixedly connected through an upper end plate and a lower end plate, the lower end plate is connected with the bottom surface of the shell through a rotating shaft, the upper end plate is connected with a driving shaft, the driving shaft is arranged on the same shaft as the rotating shaft, and blades on the two stirring rods are distributed in an inclined staggered mode.

And the first belt conveying device and the second belt conveying device are both belt conveyors.

The wet-process batching device comprises a concentration tank, a stirring tank, a feeding pump and a filter press.

The grate plate of the moistening and grinding machine is provided with expansion holes.

The utility model has the advantages that: the invention can eliminate the production problem of the caking of the moistening and grinding machine, improve the operation rate of the system and improve the solid waste treatment capacity of the rotary hearth furnace system. Through practical implementation and application, the material caking condition of the mill is greatly improved, and the overall goals of continuous operation of the system without material interruption and material reduction and uniform material mixing are realized.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is a process flow diagram;

FIG. 2 is a schematic view of a portion of a modified humidifier;

fig. 3 is a schematic structural view of a grate plate.

Labeled as:

1. the stirring rod device comprises a shell, 2, a stirring rod, 3, blades, 4, a lower end plate, 5, a rotating shaft, 6, an upper end plate, 7 and a driving shaft.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, for the purpose of helping those skilled in the art to understand more completely, accurately and deeply the conception and technical solution of the present invention, and to facilitate its implementation. It should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. In the following embodiments, the terms "first", "second" and "third" do not denote absolute differences in structure and/or function, nor do they denote a sequential order of execution, but rather are used for descriptive convenience only.

As shown in fig. 1 to 3, a system for treating caking prevention of metallurgical solid waste moistening and grinding machine comprises a wet process batching device and a moistening and grinding machine, and further comprises a first belt conveying device, a second belt conveying device and a premixing device for stirring a mixed material body, wherein the wet process batching device is connected with the premixing device through the first belt conveying device, and the premixing device is connected with the moistening and grinding machine through the second belt conveying device. This kind of structure setting, adjustment humidification process comes the wet process batching in-process in advance with the humidification process, and the wet process batching in-process directly accomplishes material humidity requirement, later through premix device misce bene, carries again to moist mill and handles, and this kind of structure and process adjustment adopt the difficult problem that humidification machine humidification processing leads to the not good control of moisture before avoiding appearing getting into moist mill, and then avoid appearing caking and putty phenomenon.

Wherein, first belt conveyors and second belt conveyors are belt conveyors. The belt conveyor is of an existing construction, being a conventional conveyor device of a production line, with the purpose of conveying the bodies. Specifically, the first belt conveyor is a first belt conveyor and comprises a belt and a belt wheel, the belt wheel is driven to rotate by the driving device, and then the belt is driven to convey the material body, so that the humidified material body is conveyed into the premixing device through a P1 belt. The second belt conveyor is a second belt conveyor, the structure of the second belt conveyor is similar to that of the first belt conveyor, and the purpose of the second belt conveyor is to convey the uniformly mixed material body of the premix device to the moistening and grinding machine through an R1 belt.

The premixing device can directly adopt a stirring device, and in order to save cost, a humidifier in a production line is modified, the humidifying function is cancelled, and only a stirring structure is used. The premixing device comprises a shell 1, a stirring rod 2 arranged in the shell 1 and a blade 3 obliquely arranged on the stirring rod 2. The two ends of the blade are of a broken belt type structure, the broken belt type structure and the blade main body structure form a broken belt spiral blade, materials are mixed while the materials are pushed to move forwards, and the stirring uniformity of the materials is facilitated. The blade major structure is paddle blade formula blade, mixed material when preventing the too fast velocity of flow of material. Preferably, the blades are inclined upwardly at an angle of 30 ° relative to the plane of the bottom surface of the housing. The blades are arranged to be of an inclined structure at the angle, so that the materials are convenient to turn and mix.

Further, the stirring rods 2 are two, the two stirring rods 2 are parallel to each other and are fixedly connected through an upper end plate and a lower end plate, the lower end plate 4 is connected with the bottom surface of the shell 1 through a rotating shaft 5, the upper end plate 6 is connected with a driving shaft 7, the driving shaft 7 is arranged on the same shaft as the rotating shaft 5, and blades on the two stirring rods 2 are obliquely staggered and distributed in a crossed manner. This kind of structure setting causes the convection current of material to mix through the rotation of blade in the humidifier for the material diffusion is mixed more evenly, because the rotation of stirring rod, inside the material agglomeration, the mutual slip between the granule, like the wave laminar fluid motion, causes local mixing, guarantees the mixing effect.

The wet-process batching device comprises a concentration tank, a stirring tank, a feeding pump and a filter press. The process of wet batching treatment is similar to the process of dezincification sludge treatment of a rotary hearth furnace in the prior art, and is not described in a plurality of cases.

In addition, in order to further avoid the phenomenon of material caking of the mill, the grate plate of the moistening and grinding machine is provided with expansion holes, so that the material passing amount is increased, the situation that uniform mixing materials are difficult to remove in time is avoided, and the phenomenon that the material caking is generated in the interior of the mill when adhesive materials appear on the inner wall of the mill is avoided. The perforated grate plate is changed into the perforated grate plate with less holes, the discharge area of the grate plate of the mill is reduced, the material storage in the mill is ensured, and the grate plate is prevented from being damaged.

The control method of the system for treating the metallurgical solid waste lubricating and grinding machine caking prevention comprises the following steps:

conveying the humidified material into a premix device and uniformly mixing; the humidified material is prepared by adopting a wet-process batching treatment process. Through the adjustment process, humidification is carried out firstly, then stirring and mixing are carried out, the mixing degree of sludge and dust removal ash can be effectively improved, and the caking rate is reduced.

And step two, conveying the uniformly mixed materials into a moistening and grinding machine, and adjusting the proportion of bentonite according to the falling frequency of green balls, wherein the adjusting method comprises the following steps: when green pellets fall, the proportion of bentonite is reduced by 0.2% for more than 20 times/m until the green pellets fall for 15-20 times/m. The mixing ratio of the bentonite is adjusted by checking the falling times of the green pellets in time, so that the viscosity is better controlled, and the caking rate is further reduced.

In order to further reduce the occurrence of material caking, the discharge area of the grate plate of the moistening and grinding machine is reduced, and the holes of the grate plate are expanded to increase the material passing amount.

When the material is zinc-containing sludge, the addition proportion of the flocculating agent is adjusted to be 0.05-0.12% according to the sludge color when the viscosity is controlled, so that the viscosity control is more reasonable, and the caking rate is further reduced. In addition, the water content of the materials entering the moistening and grinding machine is adjusted by reducing the proportion of the sludge. The water content of the material entering the moistening and grinding machine is 7.45-7.50%. The water content of the material fed into the mill is proper in the range, and the material caking of the mill can be eliminated.

As mentioned above, the control method for treating the caking prevention of the metallurgical solid waste wet mill mainly adjusts the caking of the mill by adjusting the material passing amount of the grate plate, the mixing degree of sludge and dust removal ash, the viscosity control of zinc-containing sludge and the like. The following detailed description is made for each control module:

firstly, controlling the material passing amount of a grate plate of a grinding machine:

receive moist mill design ability and actual feeding volume in earlier stage and mismatch, cause the design ability surplus, the inside filling rate is not enough, and inside packing comb board directly receives the steel ball striking, causes the comb board to damage seriously, changes porous comb board into the delumped comb board, reduces the row's of mill comb board material area, ensures the inside stock of mill, avoids the comb board to damage. In the specific production and operation process, the material passing amount of the grate plate is insufficient, the uniformly mixed materials are difficult to discharge in time, and when the inner wall of the mill is adhered, the material caking in the mill is increased, so that the grate plate is modified, the holes of the grate plate are expanded, and the material passing amount is increased.

Second, the mixing degree of sludge and dust removal ash

1) Optimizing the procedure linking link, and pre-arranging a humidifier to pre-mix the dedusting ash and the sludge to ensure the mixing effect.

2) A humidifier is modified.

a) The convective mixing of the materials is caused by the rotation of the blades in the humidifier.

b) When the material is lifted up and down due to the vertical turning of the blades, the material is diffused and mixed.

c) And due to the rotation of the stirring rod, mutual sliding among particles in the material block mass is caused, and local mixing is caused like the movement of the wave-layer fluid.

d) And the belt-breaking helical blade mixes the materials while pushing the materials to move forward.

e) The paddle type blades prevent the materials from being mixed when the materials flow at an excessively high speed.

Thirdly, controlling the viscosity of the zinc-containing sludge

1) The standard medicine adding, the operation parameter of the belt filter is stabilized, and the belt speed and the belt tension of the belt filter are set according to the standard.

2) The color of the sludge conveyed by the blast furnace is tracked, and the dosage of the flocculating agent is adjusted according to the color of the incoming material, which is shown in table 1.

Table 1: the standard matching proportion of the flocculating agent and the sludge with various colors

3) Properly reducing the sludge proportion in the ingredients, exploring out proper water content entering the mill and eliminating the caking of the mill. The examples before and after the specific mixture ratio is adjusted are shown in tables 2 and 3:

table 2: sludge ratio in material setting of moistening and grinding machine

Table 3: sludge ratio when the wet grinding machine does not agglomerate

4) And (3) timely self-checking and falling in class, reducing the proportion of bentonite by 0.2% when falling for more than 20 times/m, and repeating the steps until the green pellets fall for 15-20 times/m.

Compared with the prior art that the adjustment is not carried out, the method is actually implemented, the material caking condition of the mill is greatly improved, and the overall targets of continuous operation of the system without material interruption and material reduction and uniform material mixing are realized.

The invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-described manner. Various insubstantial improvements are made by adopting the method conception and the technical proposal of the utility model; or without improvement, the above conception and technical solution of the present invention can be directly applied to other occasions, all within the protection scope of the present invention.

Claims (7)

1. The system for treating the caking prevention of the metallurgical solid waste moistening and grinding machine comprises a wet method batching device and a moistening and grinding machine and is characterized by further comprising a first belt conveying device, a second belt conveying device and a premixing device for stirring a mixed material body, wherein the wet method batching device is connected with the premixing device through the first belt conveying device, and the premixing device is connected with the moistening and grinding machine through the second belt conveying device.

2. The system for treating the caking prevention of the metallurgical solid waste moistening and grinding machine according to claim 1, wherein the premixing device comprises a shell, a stirring rod arranged in the shell and blades obliquely arranged on the stirring rod.

3. The system for treating metallurgical solid waste mill caking prevention according to claim 2, wherein the angle of the blades is 30 ° upward relative to the plane of the bottom surface of the housing.

4. The system for treating the caking prevention of a metallurgical solid waste moistening and grinding machine according to claim 2, wherein the number of the stirring rods is two, the two stirring rods are parallel to each other and are fixedly connected through an upper end plate and a lower end plate, the lower end plate is connected with the bottom surface of the shell through a rotating shaft, the upper end plate is connected with a driving shaft, the driving shaft is arranged on the same shaft as the rotating shaft, and blades on the two stirring rods are distributed in an obliquely staggered and crossed manner.

5. The system for treating the caking prevention of a metallurgical solid waste mill according to claim 1, wherein the first belt conveyor and the second belt conveyor are both belt conveyors.

6. The system for treating the caking prevention of a metallurgical solid waste mill according to claim 1, wherein the wet batching device comprises a concentration tank, a stirring tank, a feeding pump and a filter press.

7. The system for treating the caking prevention of the metallurgical solid waste mill as claimed in claim 1, wherein the grate plate of the mill is provided with expansion holes.

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