CN110747308A

CN110747308A - Converter LT zinc-containing dust online treatment system and treatment method thereof

Info

Publication number: CN110747308A
Application number: CN201911127410.1A
Authority: CN
Inventors: 陈铁军; 陆启财; 周仙霖; 罗艳红; 万军营
Original assignee: Wuhan University of Science and Engineering WUSE
Current assignee: Wuhan University of Science and Engineering WUSE
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-04
Anticipated expiration: 2039-11-18
Also published as: CN110747308B

Abstract

The invention discloses an online processing system and a processing method for converter LT zinc-containing dust, wherein the processing system comprises a magnetic separator, a first-section air magnetic machine, a second-section air magnetic machine, a third-section air magnetic machine and a nitrogen generating device, an air outlet of the nitrogen generating device is communicated with the inside of the magnetic separator, a concentrate outlet of the magnetic separator is communicated with a feed inlet of the first-section air magnetic machine, a tailing outlet of the magnetic separator and a tailing outlet of the first-section air magnetic machine are both communicated with a feed inlet of the third-section air magnetic machine, a concentrate outlet of the first-section air magnetic machine and a concentrate outlet of the third-section air magnetic machine are both communicated with a feed inlet of the second-section air magnetic machine, and a tailing outlet of the second-section air magnetic machine is communicated with a feed inlet of the first-section air magnetic. The converter LT zinc-containing dust online treatment system is environment-friendly, simple in process and good in separation effect.

Description

Converter LT zinc-containing dust online treatment system and treatment method thereof

Technical Field

The invention relates to the technical field of dust treatment of a converter LT system, in particular to an online treatment system and method for zinc-containing dust of a converter LT.

Background

The LT system has the characteristics of good dust removal effect, low energy consumption, high gas recovery rate, simple process, more equipment maintenance and the like, and is widely applied to the converter process of iron and steel enterprises for dust removal. In addition, in recent years, the proportion of zinc-containing galvanized steel scrap entering a converter is higher, the zinc-containing dust generated by a converter LT dust removal system is difficult to treat, a large amount of zinc-containing dust is accumulated in a plurality of steel enterprises, and how to efficiently treat the zinc-containing dust of the converter LT by resources is a problem faced by the plurality of steel enterprises.

The prior art methods for treating LT zinc-containing dust include:

(1) direct return sintering: the converter LT system has fine dust particle size and higher zinc grade, zinc-containing substances are mainly concentrated on fine particles, the air permeability of a material layer can be influenced by the return sintering, and the zinc element is finally enriched in a blast furnace, so that the production is influenced;

(2) and (2) treating the converter LT system dust by adopting a dezincification process: the dezincification process mainly comprises a wet method and a fire method, wherein the wet method is mainly used for treating high-zinc refined dust and requires that the zinc grade of a zinc-containing raw material reaches more than 30 percent, while the zinc grade of the dust of a converter LT system is generally below 10 percent, and the zinc grade of the dust of the converter LT system can not reach the requirements of wet dezincification; the fire method process mainly comprises a rotary hearth furnace method and a rotary kiln method, wherein the rotary hearth furnace method and the rotary kiln method mainly process medium zinc dust with the zinc grade of 15-30%, and are not suitable for dust of an LT (LT) system, and the rotary hearth furnace method and the rotary kiln method have low processing capacity on the zinc-containing dust, wherein the rotary hearth furnace method has complex process and needs to carry out the processes of agglomeration, drying, reduction roasting, crushing, magnetic separation and the like, and the rotary hearth furnace method is adopted to process the zinc-containing dust, so the problems of complicated equipment, large investment, difficult equipment maintenance, high maintenance cost and the like exist; the rotary kiln method has lower treatment capacity than the rotary kiln method, and the iron grade of zinc-containing dust treated by the rotary kiln method needs to be lower than 30 percent, otherwise the ring formation of the rotary kiln body is easily caused.

Disclosure of Invention

In order to solve the technical problems, the invention provides an online processing system and a processing method for zinc-containing dust of a converter LT, which adopts the following technical scheme:

the utility model provides a converter LT zinciferous dust on-line treatment system, includes magnet separator, one section fan-magnetized drinking machine, two-stage process fan-magnetized drinking machine, three-stage process fan-magnetized drinking machine and nitrogen gas generating device, nitrogen gas generating device's gas outlet with the inside intercommunication of magnet separator, the concentrate export of magnet separator with the feed inlet of one section fan-magnetized drinking machine intercommunication, the tailing export of magnet separator with the tailing export of one section fan-magnetized drinking machine all with the feed inlet intercommunication of three-stage process fan-magnetized drinking machine, the concentrate export of one section fan-magnetized drinking machine with the concentrate export of three-stage process fan-magnetized drinking machine all with the feed inlet intercommunication of two-stage process fan-magnetized drinking machine, the tailing export of two-stage process fan-magnetized drinking machine pass through the pipeline with the feed.

The magnetic separator is a spiral magnetic separator, and the first-section air magnetic machine, the second-section air magnetic machine and the third-section air magnetic machine are all belt type air magnetic machines.

Preferably, still include dosing unit, compounding device and ball machine of pressing, the concentrate export of two-stage process wind magnetism machine with dosing unit feed inlet intercommunication, dosing unit's discharge gate with the feed inlet intercommunication of compounding device, dosing unit is used for adding buggy and organic binder in the powder to carry to it, the discharge gate of compounding device with the feed inlet intercommunication of ball machine of pressing, the discharge gate of ball machine of pressing communicates with the entry of converter.

A treatment method based on the converter LT zinc-containing dust online treatment system comprises the following steps:

(1) step S1: sending dust obtained after the LT system processes converter flue gas to a magnetic separator, and roughing the dust of the LT system of the converter by the magnetic separator under a nitrogen environment to obtain roughing concentrate and roughing tailings;

(2) step S2: introducing the roughed concentrate obtained in the step S1 into a first-stage air magnetic separator for fine separation to obtain first-stage concentrate and first-stage tailings;

(3) step S3: mixing the roughed tailings obtained in the step S1 with the primary tailings obtained in the step S2, and conveying the mixture to a three-section air magnetic machine to obtain scavenging concentrate and zinc-rich tailings;

(4) step S4: mixing the primary concentrate obtained in the step S2 and the scavenging concentrate obtained in the step S3, and then conveying the mixture to a secondary air magnetic machine to obtain secondary concentrate and secondary tailings;

(5) step S5: and returning the second-stage tailings obtained in the step S4 to the first-stage air-magnetic machine in the step S2.

Preferably, the magnetic field strength of the magnetic separator is 150-240 mT.

Preferably, the magnetic field strength of the segment of the fan-magnet machine is 90-120 mT.

Preferably, the magnetic field intensity of the two-stage fan-magnet machine is 40-70 mT.

Preferably, the magnetic field intensity of the three-segment air magnetic machine is 280-350 mT.

Preferably, the method further comprises the step S7: and (4) uniformly mixing the second-stage concentrate obtained in the step (S4) with an organic binder and coal powder to obtain a mixture, forming the mixture under high pressure to obtain a briquette, and putting the briquette into a converter as furnace charge for use.

Preferably, the mass ratio of the second-stage concentrate to the coal dust to the organic binder in the mixture is 100:5-10: 4-8.

Preferably, the forming pressure of the mixture is 15-25 MPa.

The invention has the beneficial effects that:

(1) the converter LT zinc-containing dust online treatment system is simple in process, dry-process treatment is carried out in the whole process, the whole process is closed, the environment is friendly, and particularly dry separation is adopted in a mineral separation part, so that the problems of mineral separation water consumption and difficult filtration are solved;

(2) after the converter LT zinc-containing dust online processing system and the processing method thereof process the converter LT system dust, the obtained second-stage concentrate has the iron grade of more than 65-66% and the zinc grade of less than 1-2%, the obtained zinc grade of zinc-rich tailings is more than 15%, and the sorting effect is good;

(3) the zinc-rich tailings can be used as a raw material of a rotary hearth furnace process or a raw material of a zinc selection process, so that the utilization rate of the product of the converter LT zinc-containing dust online treatment method is improved;

(4) the converter LT zinc-containing dust online treatment method provided by the invention mixes the obtained two-stage concentrate with the organic binder and the coal powder, then carries out high-pressure compression molding to obtain briquettes, the compressive strength of the obtained briquettes is 600-1500N/briquette, and the briquettes are used as a furnace charge of the converter and put into the converter, thereby serving as a cooling agent of the converter and providing a source of iron for the converter.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a process flow diagram of an online processing system for zinc-containing dust of a converter LT according to an embodiment of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The principles and features of the present invention are described below in conjunction with the accompanying fig. 1, which is provided by way of example only to illustrate the present invention and not to limit the scope of the present invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the converter LT zinc-containing dust online treatment system comprises a magnetic separator 1, a first-section air magnetic machine, a second-section air magnetic machine 3, a third-section air magnetic machine 4 and a nitrogen gas generating device 5, wherein an air outlet of the nitrogen gas generating device 5 is communicated with the interior of the magnetic separator 1, a concentrate outlet of the magnetic separator 1 is communicated with a feed inlet of the first-section air magnetic machine 2, a tailing outlet of the magnetic separator 1 and a tailing outlet of the first-section air magnetic machine 2 are communicated with a feed inlet of the third-section air magnetic machine 4, a concentrate outlet of the first-section air magnetic machine 2 and a concentrate outlet of the third-section air magnetic machine 4 are respectively communicated with a feed inlet of the second-section air magnetic machine 2, and tailings of the second-section air magnetic machine are conveyed to the first-section air magnetic machine 2.

Based on the converter LT zinc-containing dust online processing system, an embodiment of the converter LT zinc-containing dust online processing method is provided.

The iron grade of the converter LT system dust is 50-60%, the zinc grade is 3-10%, and the temperature is less than 200 ℃, so that the magnetic separator is a spiral magnetic separator, the handling capacity of the spiral magnetic separator is large, and the inner cavity of the spiral magnetic separator is high-temperature resistant; the first-stage air magnetic machine, the second-stage air magnetic machine and the third-stage air magnetic machine are all belt type air magnetic machines, and the belt type air magnetic machines are simple in equipment, simple in maintenance and low in investment cost.

In examples 1 to 11 of the present application, the iron grade of converter LT system dust was 53.41% and the zinc grade was 7.12%.

Example 1

The on-line treatment method of converter LT zinc-containing dust described in example 1 comprises the following steps:

(1) step S1: conveying the converter LT system dust to a magnetic separator, and roughing the converter LT system dust by the magnetic separator under the conditions of nitrogen environment and 150mT magnetic field intensity to obtain roughed concentrate and roughed tailings;

(2) step S2: the rougher concentrate obtained in the step S1 is conveyed to a first-stage air magnetic machine, and the first-stage air magnetic machine carries out fine concentration on the rougher concentrate under the condition that the magnetic field intensity is 100mT to obtain first-stage concentrate and first-stage tailings;

(3) step S3: mixing the roughed tailings obtained in the step S1 and the first-stage tailings obtained in the step S2, and conveying the mixture to a three-stage air-magnetic machine, and scavenging the mixture by the three-stage air-magnetic machine under the condition that the magnetic field intensity is 280mT to obtain scavenged concentrate and zinc-rich tailings;

(4) step S4: mixing the first-stage concentrate obtained in the step S2 and the scavenging concentrate obtained in the step S3, and then conveying the mixture to a second-stage air magnetic machine, wherein the second-stage air magnetic machine carries out concentration under the condition that the magnetic field intensity is 70mT, so that second-stage concentrate and second-stage tailings are obtained;

(5) step S5: and returning the second-stage tailings obtained in the step S4 to the first-stage air magnetic machine.

Example 2

Different from the example 1, the magnetic separator roughens the dust of the converter LT system in the step S1 under the condition of nitrogen environment and the magnetic field intensity of 180 mT.

Comparative example 1

Unlike example 2, the magnetic separator roughens the converter LT system dust in the air environment under the condition of the magnetic field intensity of 180mT in step S1.

Example 3

Unlike example 2, the secondary air magnetic machine in step S4 concentrates the primary concentrate obtained in step S2 and the scavenged concentrate obtained in step S3 under the condition of the magnetic field strength of 60 mT.

Example 4

Unlike example 3, the secondary air magnetic machine in step S4 concentrates the primary concentrate obtained in step S2 and the scavenged concentrate obtained in step S3 under the condition of 40mT magnetic field strength.

Example 5

Different from the example 2, the magnetic separator roughens the dust of the converter LT system in the step S1 under the condition of nitrogen environment and magnetic field intensity of 200 mT.

Example 6

Unlike example 5, the primary air-magnetic separator concentrates the roughed concentrate in step S2 under the condition of the magnetic field intensity of 90 mT.

Example 7

Unlike in example 6, the three-stage fan-magnet machine was swept under a magnetic field strength of 310mT in step S3.

Example 8

Unlike in example 6, the three-stage fan-magnet machine was swept under a magnetic field strength of 350mT in step S3.

Example 9

Unlike example 5, the primary air magnetic separator concentrates the roughed concentrate in step S2 under the condition of 120mT magnetic field strength.

Example 10

Unlike example 5, in step S1, the magnetic separator roughens the converter LT system dust under the condition of a nitrogen atmosphere and a magnetic field strength of 230 mT.

Example 11

Unlike example 5, in step S1, the magnetic separator roughens the converter LT system dust under the condition of a nitrogen atmosphere and a magnetic field strength of 240 mT.

The iron grade and the zinc grade of the second-stage concentrate and the zinc-rich tailings obtained in examples 1 to 11 were respectively tested, and the test results are shown in table 1.

Table 1 test results of iron grade and zinc grade in the second stage concentrate, zinc-rich tailings in examples 1-11.

From the above test results, it can be seen that:

(1) as can be seen from the test structures of examples 1 to 11, the iron grade of the sorted second-stage concentrate is 65 to 66 percent, and the zinc grade is lower than 1 to 2 percent; the zinc grade of the zinc-rich concentrate is higher than 15%, so that the zinc-rich concentrate has an excellent separation effect;

(2) from the test results of the embodiment 2 and the comparative example 1, it can be known that, under the same magnetic field intensity condition of the magnetic separator, the first-stage air magnetic machine, the second-stage air magnetic machine and the third-stage air magnetic machine, the separation effect of the magnetic separator under the nitrogen environment is better, because nitrogen cools dust of the LT system of the converter, the oxidation degree of dust particles is reduced, the phenomenon of oxidation and heat release of the dust particles is reduced, the dust of the LT system is in a fully loose state, and a better separation effect is realized;

(3) from the test results of the examples 1-2, 6 and 10-11, it can be seen that when the magnetic field strength of the magnetic separator is more than 150mT and less than 180mT, the iron grade of the roughed concentrate is increased along with the increase of the magnetic field strength of the magnetic separator, and when the magnetic field strength of the magnetic separator is more than 180mT, the yield of the roughed concentrate is increased along with the increase of the magnetic field strength of the magnetic separator, and the iron grade is reduced; the iron grade and the zinc grade of the zinc-rich tailings are increased along with the increase of the magnetic field intensity of the magnetic separator;

(4) from the test results of examples 5-6 and example 9, it can be known that as the magnetic field intensity of the first-stage air magnetic separator increases, the yield of the second-stage concentrate gradually increases, the iron grade decreases, and the zinc grade of the zinc-rich tailings increases as the magnetic field intensity of the magnetic separator increases;

(5) from the test results of examples 2-4, it can be known that the zinc grade of the zinc-rich tailings is higher than 15%;

(6) from the test results of examples 6-8, the zinc grade of the zinc-rich tailings is higher than 15%.

The briquetting requires that the iron grade is more than 65 percent, the zinc grade is less than 1-2 percent, the compressive strength reaches 600 plus 1200N/piece, and the pulverization rate is less than 10 percent when the pulverization rate is less than 8 mm. The secondary concentrates obtained in examples 1 to 11 of this application contain metallic iron, FeO and a small amount of Fe₂O₃The iron grade is 65-66%, and the briquettes obtained by pressure forming the second-stage concentrate obtained in examples 1-11 can be used as converter burden.

The dust treatment system of the converter LT system comprises a magnetic separator 1, a first-section air magnetic machine 2, a second-section air magnetic machine 3, a third-section air magnetic machine 4, a nitrogen generating device 5, a batching device 6, a mixing device 7 and a ball press machine 8, wherein an air outlet of the nitrogen generating device 5 is communicated with the interior of the magnetic separator 1, a concentrate outlet of the magnetic separator 1 is communicated with a feed inlet of the first-section air magnetic machine 2, a tailing outlet of the magnetic separator 1 and a tailing outlet of the first-section air magnetic machine 2 are communicated with a feed inlet of the third-section air magnetic machine 4, a concentrate outlet of the first-section air magnetic machine 2 and a concentrate outlet of the third-section air magnetic machine 4 are respectively communicated with a feed inlet of the second-section air magnetic machine 2, tailings of the second-section air magnetic machine are conveyed to the first-section air magnetic machine 2 through a pipeline, a concentrate outlet of the second-section air magnetic machine 3 is communicated with a feed, the discharge hole of the batching device 6 is communicated with the feed inlet of the mixing device 7, the batching device 6 is used for adding coal powder and organic binder into powder conveyed to the batching device, the discharge hole of the mixing device 7 is communicated with the feed inlet of the ball press machine 8, and the discharge hole of the ball press machine 8 is communicated with the inlet of the converter 9.

According to the above-mentioned system for treating converter LT system dust, examples 12 to 16 of the method for online treatment of converter LT zinc-containing dust are proposed.

The material proportioning device adopted in the application is an electronic belt scale material proportioning device, so that the precision and the efficiency are high; the mixing device is a powerful mixer, and the ball press adopts a roller type ball press.

This application organic binder is formed by mixing sodium borate, starch, sodium hydroxide and water, and it is effectual to bond, improves the intensity of briquetting by a wide margin, need not to add water when the compounding, makes the briquetting dry pressing shaping in ball press machine, need not to dry, reduces processing system's running cost, and organic binder can decompose and volatilize after dropping into the converter simultaneously, avoids causing the reduction of iron grade because of organic binder's addition.

Example 12

And (2) uniformly mixing the second-stage concentrate obtained in the examples 1-11 with coal powder and an organic binder to obtain a mixture, wherein the mass ratio of the second-stage concentrate to the coal powder to the organic binder is 100:5:5, and the mixture is respectively subjected to pressure forming to obtain briquettes, and the forming pressure of the mixture is 22 MPa.

Example 13

And (2) uniformly mixing the second-stage concentrate obtained in the example 6, the coal dust and the organic binder, and then performing high-pressure compression molding to obtain a briquette, wherein the mass ratio of the second-stage concentrate to the coal dust to the organic binder is 100:5:5, and the molding pressure is 18 MPa.

Example 14

Unlike example 13, the molding pressure was 25 MPa.

Example 15

Unlike example 13, the mass ratio of the second-stage concentrate, the coal dust and the organic binder was 100:5: 4.

Example 16

Unlike example 13, the mass ratio of the second-stage concentrate, the coal dust and the organic binder was 100:5: 8.

The molded compacts obtained in examples 12 to 16 were each tested for zinc grade, compressive strength, and degree of powdering of 8mm or less, and the test results are shown in Table 2.

TABLE 2 Zinc grade, compressive strength, degree of pulverization below 8mm of briquettes in examples 12 to 16.

	Grade of zinc (%)	Compressive Strength (/ body)	Powdering less than 8mm (%)
				Example 12	Less than 0.5-1%	800-1000N	Less than 8 percent
Example 13	Less than 0.5-1%	700-900N	Less than 10 percent
				Example 14	Less than 0.5-1%	900-1100N	Less than 7 percent
Example 15	Less than 0.5-1%	600-800N	Less than 10 percent
				Example 16	Less than 0.5-1%	1000-1200N	Less than 5 percent

From the data of table 2, the following conclusions can be drawn:

(1) as is clear from the test results of example 12, the compacts obtained in examples 1 to 11 all had properties in accordance with those of compacts as converter charges;

(2) from the test results of examples 12 to 14, it is understood that the compressive strength of the briquette increases with an increase in the molding pressure and the degree of powdering below 8mm decreases.

(3) From the test results of example 12 and examples 15 to 16, it is understood that as the mass ratio of the organic binder in the mix increases, the compressive strength of the briquettes increases and the degree of pulverization less than 8mm decreases.

The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. An LT zinc-containing dust online treatment system of a converter is characterized by comprising a magnetic separator (1), a first-section air magnetic machine (2), a second-section air magnetic machine (3), a third-section air magnetic machine (4) and a nitrogen generating device (5), the air outlet of the nitrogen generating device (5) is communicated with the interior of the magnetic separator (1), the concentrate outlet of the magnetic separator (1) is communicated with the feed inlet of the first segment of the air magnetic separator (2), the tailing outlet of the magnetic separator (1) and the tailing outlet of the first segment of air magnetic machine (2) are both communicated with the feed inlet of the third segment of air magnetic machine (4), the concentrate outlet of the first segment of air magnetic machine (2) and the concentrate outlet of the third segment of air magnetic machine (4) are both communicated with the feed inlet of the second segment of air magnetic machine (2), and a tailing outlet of the second-section air magnetic machine is communicated with a feeding hole of the first-section air magnetic machine (2) through a pipeline.

2. The converter LT zinc-containing dust online treatment system according to claim 1, further comprising a batching device (6), a mixing device (7) and a ball press machine (8), wherein a concentrate outlet of the two-stage air-magnetic machine (3) is communicated with a feed inlet of the batching device (6), a discharge outlet of the batching device (6) is communicated with a feed inlet of the mixing device (7), the batching device (6) is used for adding coal powder and organic binder into powder conveyed to the batching device, a discharge outlet of the mixing device (7) is communicated with a feed inlet of the ball press machine (8), and a discharge outlet of the ball press machine (8) is communicated with an inlet of the converter (9).

3. A method for processing the converter LT zinc containing dust online processing system according to claim 1 or 2, comprising the steps of:

4. The online processing method of zinc-containing dust of converter LT as defined in claim 3, wherein the magnetic field strength of the magnetic separator is 150-240 mT.

5. The online processing method of converter LT zinc-containing dust according to claim 3, characterized in that the magnetic field intensity of the first segment of air magnetic machine is 90-120 mT.

6. The online processing method of converter LT zinc-containing dust according to claim 3, characterized in that the magnetic field intensity of the secondary air magnetic machine is 40-70 mT.

7. The online processing method of zinc-containing dust in a converter LT as defined in claim 3, wherein the magnetic field intensity of the three-segment air magnetic machine is 280-350 mT.

8. The method for processing converter LT zinc-containing dust online processing system according to any one of claims 3 to 7, further comprising the step S7: and (4) uniformly mixing the second-stage concentrate obtained in the step (S4) with an organic binder and coal powder to obtain a mixture, performing pressure forming on the mixture to obtain a briquette, and putting the briquette into a converter as furnace charge for use.

9. The online processing method of converter LT zinc-containing dust according to claim 8, characterized in that the mass ratio of the second-stage concentrate, the coal dust and the organic binder in the mixture is 100:5-10: 4-8.

10. The on-line treatment method of converter LT zinc-containing dust according to claim 8, characterized in that the forming pressure of the mixture is 15-25 MPa.