CN104399667B - Stainless steel slag sorting device and stainless steel slag sorting method - Google Patents

Abstract

The invention relates to the technical field of steel slag treatment in the metallurgical industry, and discloses a stainless steel slag sorting device and a stainless steel slag sorting method. The device comprises a hopper, a bar screen, a bucket elevator, a powder concentrator, a cyclone dust removal device and a bag-type dust remover, wherein the powder concentrator is externally connected with an air blower, a granular material outlet is formed in the bottom end of the powder concentrator, and a powder outlet is formed in the upper portion of the side wall opposite to a feeding port of the powder concentrator. After the stainless steel slag raw material is primarily screened, the stainless steel slag is sorted by the powder concentrator in a micro-negative pressure working environment, so that the enrichment of granules with larger particle sizes containing metal materials is facilitated, powder with smaller particle sizes is collected by the cyclone dust collector, and the bag dust collector can prevent dust from being discharged into the atmosphere; the invention reduces the abrasion of the steel slag on equipment, prolongs the service life of the equipment, reduces the production cost, reduces the water consumption and the water treatment cost of wet treatment, and realizes energy conservation and emission reduction.

Description

Stainless steel slag sorting device and stainless steel slag sorting method

technical field

The invention relates to the technical field of steel slag treatment in the metallurgical industry, in particular to a stainless steel slag sorting device and a stainless steel slag sorting method.

Background technique

Steel slag is industrial solid waste slag produced in the process of smelting steel. The waste slag produced by steel mills can be divided into two types due to different cooling processes: dry slag and water slag. Generally speaking, there are three components in steel slag: steel grain, iron powder and waste ash. Selecting the steel grain and iron powder through a reasonable process can produce huge economic benefits.

First, the steel slag needs to be ground to break the structure between them and separate them. The equipment used to grind steel slag is ball mill, rod mill, etc.

Domestic metallurgical enterprises usually use wet treatment for stainless steel slag. First, the steel slag is evenly sent to the ball mill for grinding. of steel grains. Or use a conveyor to send the steel slag from which steel particles have been selected to a rod mill for fine grinding, and use the flotation method to effectively select weakly magnetic stainless steel metal materials. The remaining waste ash is discharged from the waste material port of the magnetic separator. The waste material port is connected with a conveyor, which is sent into the waste ash pool, and the waste ash pool is cleaned regularly. Waste ash is a good building material, which can be sold to cement factories to make cement or building materials factories.

There are following deficiencies in wet processing:

(1) A large amount of powdery materials and granular materials in stainless steel slag enter the processing equipment without powder and granule separation, which is easy to cause wear and tear on the grinding equipment, and requires frequent maintenance and replacement. The investment in grinding equipment is large and the production cost is high;

(2) During the cooling process of stainless steel slag, water needs to be sprinkled for cooling, which makes it difficult to control the water content in stainless steel slag, and it is even more difficult to control the water content in stainless steel slag in humid climate areas, making it impossible to achieve air separation of stainless steel slag;

(3) In the powder with a particle size of <3mm, the content of metal materials is very low, and entering the wet treatment without separation will increase the water consumption and increase the cost of water treatment.

Contents of the invention

The purpose of the present invention is to provide a stainless steel slag sorting device and a stainless steel slag sorting method to solve the problems of easy wear of equipment and high production costs in the wet treatment of stainless steel slag. The present invention is suitable for air separation of stainless steel slag in dry areas .

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A sorting device for stainless steel slag, which comprises a hopper, the feed inlet of the hopper is provided with a bar screen, the discharge outlet of the hopper is connected with the bottom end of a bucket elevator, and the top of the bucket elevator is connected with the bottom end of the bucket elevator. The feed inlet of the raw material bin is connected, and a sealed bin is provided at the outlet of the raw material bin, and the outlet of the sealed bin is connected with a powder separator, and the bottom end of the powder separator is provided with a pellet Outlet, the upper part of the side wall of the powder separator opposite to the feed port of the powder separator is provided with a powder outlet, and the powder outlet is connected to the inlet end of the cyclone dust removal device through the air duct, and the cyclone dust removal device The outlet at the upper end is connected with the bag filter, and the lower end of the cyclone dust removal device is provided with a dust removal port.

As a further improvement of the present invention, the feed port of the powder classifier is externally connected with a blower.

As a further improvement of the present invention, the blower is a variable frequency blower, and the amount of induced air is determined according to the particle size of the powder to be screened.

As a further improvement of the present invention, the pellet outlet of the powder classifier is connected to the bottom end of the pellet elevator, and the top of the pellet elevator is connected to the feed port of the pellet bin.

As a further improvement of the present invention, the powder separator is a V-type powder separator.

As a further improvement of the present invention, the cyclone dust collector is composed of two cyclone dust collectors, one of the cyclone dust collectors discharges powder, and the other cyclone dust collector collects powder materials.

As a further improvement of the present invention, the particle size of the pellets is ≥3mm.

As a further improvement of the present invention, the particle size of the powder is <3mm.

As a further improvement of the present invention, the bar spacing of the bar sieve is 180-250 mm.

A method for sorting stainless steel slag, the method is completed using the above-mentioned stainless steel slag sorting device, and it includes the following steps:

Step 1. Preliminarily screen the stainless steel slag raw slag by using the rod sieve, and lift the screened stainless steel slag to the feed inlet of the high-level raw material bin through the bucket elevator;

Step 2, the stainless steel slag enters the feed port of the powder classifier through the sealed bin provided at the feed port of the raw material bin, and the stainless steel slag is classified by the powder classifier, and the fine powder selected by the powder classifier The degree is adjusted by the frequency conversion of the blower. Under the action of the blower, the powder in the stainless steel slag is blown to the powder outlet by the wind, and enters the cyclone dust removal device through the air duct, and the pellets containing metal materials Under the action of gravity, it falls to the outlet of the pellets, and is lifted by the pellet elevator to be stored in the pellet bin;

Step 3: The cyclone dust collector collects the powder, and the remaining dust continues to enter the bag filter and is collected by the bag filter.

Since the powder classifier is equipped with an external blower, and because the equipment operates under a slight negative pressure, the induced air volume of the bag filter is slightly greater than the maximum air volume of the blower.

The beneficial effects of the present invention are:

(1) A rod screen is installed at the bottom of the stainless steel slag hopper to conduct preliminary screening of the raw material of stainless steel slag. The steel slag that meets the requirements enters the processing equipment. The wear and tear of the lump material on the powder classifier;

(2) Adjust the particle size of the winnowing powder by adjusting the air volume of the blower connected to the powder classifier, so as to reliably realize winnowing of stainless steel slag;

(3) The interior of the winnowing device of the present invention is an air-oriented operating environment, which is conducive to the enrichment of pellets with high metal content and reduces the content of metal materials in the powder;

(4) The stainless steel slag enters from the upper feed port of the powder classifier. Under the action of gravity, the steel slag continuously collides with the step breaking plate inside the powder classifier. The agglomerated steel slag is broken up. At this time, the loose steel slag Under the action of air flow, the granules and powder are classified by the guide plate, which reduces the wear of the steel slag on the equipment selection and grinding, prolongs the service life of the equipment, and reduces the production cost;

(5) The purpose of using two cyclone dust collectors in the present invention is to make the production process continuous. When one cyclone dust collector is used for powder discharge operations, the other cyclone dust collector is used for powder material collection operations; The dust collection capacity of the dust collector, thereby reducing the operating cost of the bag filter;

(6) The present invention is combined with existing mature technologies, which reduces technical risks, reduces the number of dust production points and reduces the dust removal capacity of the dust collector, thereby reducing the cost of dust removal equipment and reducing environmental pollution. The water consumption and water treatment cost of wet treatment are reduced, and energy saving and emission reduction are realized.

Description of drawings

Fig. 1 is a structural representation of the present invention;

In the figure: 1. Hopper, 2. Bucket elevator, 3. Raw material bin, 4. Powder separator, 5. Grain elevator, 6. Grain bin, 7. Cyclone dust removal device, 9. Bag filter.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

A sorting device for stainless steel slag, which includes a hopper 1, a bar screen is provided at the feed inlet of the hopper 1, the discharge outlet of the hopper 1 is connected with the bottom end of the bucket elevator 2, and the top end of the bucket elevator 2 It is connected with the inlet of the raw material bin 3, and the outlet of the raw material bin 3 is provided with a sealed bin, and the outlet of the sealed bin is connected with the V-type powder separator 4; the inlet of the V-type powder separator 4 The frequency conversion blower is externally connected, and the induced air volume is determined according to the granularity of the powder to be screened. The bottom of the V-type powder classifier 4 is provided with a pellet outlet, and the pellet outlet is connected to the bottom of the pellet elevator 5. The top of the material elevator 5 is connected to the feed port of the pellet bin 6; the upper part of the side wall of the V-type powder separator 4 opposite to the feed port of the V-type powder separator 4 is provided with a powder outlet, and the powder outlet passes through The air duct is connected to the inlet end of the cyclone dust removal device 7. The cyclone dust removal device 7 is composed of two cyclone dust collectors. One of the cyclone dust collectors discharges powder, and the other cyclone dust collector collects powder materials. The cyclone dust collector The upper end outlet of 7 is connected with the bag filter 9, and the lower end of the cyclone dust removal device 7 is provided with an ash removal port.

In the present invention, the particle size of the granular material is ≥3mm, and the particle size of the powder material is <3mm. The rod spacing of the rod screen is 180~250mm.

A method for sorting stainless steel slag, the method is completed using the above-mentioned stainless steel slag sorting device, and it includes the following steps:

Step 1. Preliminarily screen the stainless steel slag raw slag with a rod sieve, and lift the screened stainless steel slag to the feed inlet of the high-level raw material bin 3 through the bucket elevator 2;

Step 2: The stainless steel slag enters the feed port of the powder classifier 4 through the sealed bin set at the feed port of the raw material bin 3, and the stainless steel slag is classified by the classifier 4, and the fineness of the powder selected by the classifier 4 is frequency-converted by the blower Adjustment, under the action of the blower, the powder in the stainless steel slag is blown to the powder outlet by the wind, and enters the cyclone dust removal device 7 through the air duct, and the pellets containing metal materials fall to the pellet outlet under the action of gravity. Elevated to the pellet bin 6 by the pellet hoist 5 for storage;

Step 3: The cyclone dust collector 7 collects the powder, and the remaining dust continues to enter the bag filter 9 to be collected by the bag filter 9 .

After preliminary screening of stainless steel slag raw materials, the invention uses the micro-negative pressure working environment caused by the external blower and bag filter of the powder classifier to sort stainless steel slag, which is beneficial to the enrichment of larger granular materials containing metal materials. The powder with smaller particle size is collected by the cyclone dust collector, and the bag filter can prevent the dust from being discharged into the atmosphere; the present invention is composed of existing mature technologies, which reduces technical risks, reduces equipment wear, and prolongs the life of the equipment. The service life reduces the production cost, reduces the number of dust production points and also reduces the dust removal capacity of the dust collector, reduces the operating cost of the bag filter, and realizes energy saving and emission reduction.

Claims (9)

1. a kind of stainless steel slag sorting unit, it is characterised in that：It includes hopper（1）, hopper（1）Charging aperture be provided with rod Sieve, the hopper（1）Discharging opening and bucket elevator（2）Bottom be connected, the bucket elevator（2）Top with it is former Feed bin（3）Charging aperture be connected, the raw material cabin（3）Discharge outlet be provided with gas-tight silo, the discharging opening of the gas-tight silo with Powder concentrator（4）It is connected, the powder concentrator（4）Bottom be provided with Pellet exit, with the powder concentrator（4）Charging aperture is opposite Powder concentrator（4）Side wall upper part is provided with powder outlet, and the powder outlet is by air channel and cyclone dust collector（7）Arrival end phase Connection, the cyclone dust collector（7）Upper end outlet and sack cleaner（9）It is connected, the cyclone dust collector（7）Under End is provided with ash disposal mouth；The cyclone dust collector（7）It is made up of two cyclone dust collectors, one of them described cyclone dust collectors exists During discharge powder, another described cyclone dust collectors carries out powder and collects operation.

2. stainless steel slag sorting unit according to claim 1, it is characterised in that：The powder concentrator（4）Charging aperture External air blast.

3. stainless steel slag sorting unit according to claim 2, it is characterised in that：The air blast is frequency conversion air blast Machine, the size of its blow rate required determines according to the granularity of required screening powder.

4. stainless steel slag sorting unit according to claim 1 and 2, it is characterised in that：The powder concentrator（4）Pellet Outlet and pellet elevator（5）Bottom be connected, the pellet elevator（5）Top and pellet storehouse（6）Charging aperture phase Connection.

5. stainless steel slag sorting unit according to claim 4, it is characterised in that：The powder concentrator（4）Powder is selected for V-type Machine.

6. stainless steel slag sorting unit according to claim 1, it is characterised in that：Granularity >=the 3mm of the pellet.

7. stainless steel slag sorting unit according to claim 1, it is characterised in that：The granularity ＜ 3mm of the powder.

8. stainless steel slag sorting unit according to claim 1, it is characterised in that：The rod spacing of the bar screen is 180~250mm。

9. a kind of stainless steel slag method for separating, it is characterised in that：It is comprised the following steps：

Step one, by stainless steel slag original slag tentatively sieved using bar screen, the stainless steel slag Jing bucket types after screening are carried The machine of liter（2）It is promoted to positioned at high-order raw material cabin（3）Charging aperture；

Step 2, stainless steel slag are through the raw material cabin（3）The gas-tight silo arranged at charging aperture enters into powder concentrator（4）Enter Material mouth, by the powder concentrator（4）Stainless steel slag is classified, the powder concentrator（4）Powder fineness is selected to be adjusted by blower variable frequency Section, in the presence of the air blast, by wind to powder outlet, Jing is removed in air channel the powder in stainless steel slag into whirlwind Dirt device（7）Interior, the pellet containing metalliferous material is drop under gravity at Pellet exit, by pellet elevator（5）Carry Rise to pellet storehouse（6）Memory storage；

Step 3, the cyclone dust collector（7）Powder is collected, remaining dust goes successively to sack cleaner（9）, by the cloth Bag dust collector（9）It is collected.