A device and method for suppressing agglomeration during the transport of sintering machine head ash.

Abstract

This invention relates to a method for transporting sintering machine head ash in cans, and more particularly to a device and method for inhibiting caking of sintering machine head ash during canning and transportation. The method includes a funnel-shaped storage tank located above the sintering machine head ash discharge port, with the tank opening pipe connected to the discharge port. An anti-caking agent is added during the canning process to reduce ash sticking to the can during transport. The anti-caking agent inhibits caking between dust particles, absorbs moisture from the sintering machine head ash for drying, and a dispersant is added to prevent the sintering machine head ash from forming large, sticky lumps.

Description

Technical Field

[0001] This invention relates to a method for transporting sintering machine head ash in a container, and more particularly to a device and method for preventing caking of sintering machine head ash during transport. Background Technology

[0002] Sintering machines are suitable for sintering operations in large-scale ferrous metallurgical sintering plants. They are the main equipment in the sintering process, capable of sintering concentrates and rich ore powders of different compositions and particle sizes into blocks, and partially eliminating harmful impurities such as sulfur and phosphorus contained in the ore. Sintering machine head ash is fine dust collected by the flue gas dust collector at the sintering machine head during the iron ore sintering process. It has fine particle size, low density, and high moisture content. To avoid dust pollution, this fine dust needs to be transported in cans. However, due to the fine particle size of the sintering machine head ash, the contact area between dust particles is large, forming numerous capillaries. The high moisture content provides stronger capillary force, resulting in a large static sphericity index. The capillary force binds the dust particles together to form spherical nuclei. During the dust canning process, the particles are in close contact and compressed layer by layer. Under the combined action of pressure and capillary force, the nuclei are squeezed and collided with each other, making the particles within the nuclei compact. The nuclei agglomerate and grow, forming large clumps. The non-adhered fine dust fills the gaps between the nuclei, making the structure even more compact. Therefore, when canning and transporting sintering machine head ash, clumping and sticking to the can will occur, and it is difficult to remove, which greatly affects the transportation efficiency and has a significant impact on the production efficiency of subsequent dust recycling. At present, the means to alleviate the clumping of sintering machine head ash during transportation is high-temperature pretreatment to dry the moisture contained in it, thereby reducing capillary force and reducing clumping. However, this method has high energy consumption and a small processing volume per batch, which limits its application.

[0003] To reduce the agglomeration of fine dust during transportation, researchers have done extensive work on transportation equipment and material modification. Chinese Patent CN111332818A discloses a metallurgical machinery device for facilitating dust transportation. This device uses a dust distribution group at the dust outlet to evenly distribute the dust within each dispersion chamber, significantly improving dust discharge efficiency. Dust guide plates effectively prevent dust residue, ensuring even discharge into the dust collection hopper. A cleaning brush accelerates dust settling, and a dust-splashing bag prevents dust from scattering. The invention also utilizes a scissor-type telescopic assembly to increase the distance between equal points. The invention offers advantages such as reduced size, allowing for the compaction and dispersion of multiple dust particles with high efficiency and effectiveness. This results in fine and uniform dust discharge, preventing clumping during material discharge and thus avoiding blockages in the equipment. The cleaning brush not only accelerates the dust discharge speed but also prevents the dust dispersion net from clogging. The non-elastic tightening belt allows for adjustments to the diameter of the tightening opening, adapting to dust discharge pipes of different diameters and isolating the feed hopper from the outside environment. However, this invention is only suitable for dust with a low static balling index. For dust with a high static balling index, such as sintering machine head dust, clumping will still occur during transportation, leading to reduced transportation efficiency, increased transportation costs, and decreased production efficiency. Summary of the Invention

[0004] To achieve the above objectives, this invention provides a device and method for inhibiting agglomeration of sintering machine head ash during transportation. By adding an anti-agglomeration agent during the sintering machine head ash filling process, the agglomeration phenomenon between dust particles is inhibited. The moisture in the sintering machine head ash is absorbed, which plays a drying role. Furthermore, a dispersant is added to prevent the sintering machine head ash from forming large, sticky lumps.

[0005] To achieve the above objectives, the present invention provides a device for suppressing agglomeration during the transport of sintering machine head ash. A funnel-shaped storage tank is provided above the sintering machine head ash discharge port. The tank opening pipe is connected to the discharge port. The storage tank is composed of several groups, and the openings of the storage tanks are connected in series to the discharge port. An anti-agglomeration agent is provided inside the funnel-shaped storage tank.

[0006] A method for inhibiting agglomeration of sintering machine head ash during canning and transportation involves adding an anti-agglomeration agent during the canning process to reduce the sticking of sintering machine head ash to the can during canning and transportation.

[0007] Preferably, the composition of the anti-caking agent, by mass percentage, is 65-70% calcium oxide, 25-35% calcium carbonate, 4-6% blast furnace bag ash, and 1-3% sodium dodecyl sulfate.

[0008] Preferably, the anti-caking agent is thoroughly mixed with the sintering machine head ash, and the added anti-caking agent is 8-10% of the total amount of sintering machine head ash.

[0009] Preferably, the anti-caking agents are all in the form of solid fine particles, with particle sizes of calcium oxide particles 3-5 mm in diameter, calcium carbonate particles 1-2 mm in diameter, and sodium dodecyl sulfate particles 0.1-0.3 mm in diameter.

[0010] Preferably, in the step of loading the sintering machine head ash and anti-caking agent into the tanker truck, the anti-caking agent accounts for 8-10% of the total amount of sintering machine head ash. First, 1.0%-2.0% of the total amount of anti-caking agent is added to the tanker truck, then 25% of the total amount of sintering machine head ash is added. Loading of the sintering machine head ash is stopped, and then 1.5%-2.0% of the total amount of anti-caking agent is added separately. 25% of the total amount of sintering machine head ash is added to the tanker truck, then 1.5%-2.0% of the total amount of anti-caking agent is added separately. 25% of the total amount of sintering machine head ash is added separately. 1.5%-2.0% of the total amount of anti-caking agent is added separately. 25% of the total amount of sintering machine head ash is added separately. 2.0%-2.5% of the total amount of anti-caking agent is added separately.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] (1) The device and method for inhibiting the clumping of sintering machine head ash during transportation as described in this invention involves mixing calcium oxide, calcium carbonate, blast furnace bag ash, and sodium dodecyl sulfate of different particle sizes into the sintering machine head ash. The addition of large-particle calcium oxide will absorb the moisture in the sintering machine head ash, thus playing a drying role. Since calcium oxide will turn into calcium hydroxide after absorbing water, and calcium hydroxide has adhesive properties, smaller-particle calcium carbonate and blast furnace bag ash are added to it. The blast furnace bag ash contains a large amount of carbon, which can act as a dispersant with calcium carbonate to prevent calcium hydroxide from sticking to the sintering machine head ash and forming large, sticky lumps. In order to prevent calcium hydroxide from clumping together, even smaller-particle sodium dodecyl sulfate is added to fill the gaps between calcium hydroxide and the dispersant. The added calcium oxide, calcium carbonate, and blast furnace bag ash are obtained from the previous process of sintering machine head ash production, which greatly reduces the processing cost. Furthermore, calcium oxide, calcium carbonate, blast furnace bag ash, and sodium dodecyl sulfate have no negative impact on the subsequent utilization of sintering machine head ash dust in the production process.

[0013] (2) By adding an anti-caking agent to the tank truck first to prevent the sintering machine head ash from directly contacting the bottom of the tank and sticking to the bottom, the anti-caking agent is added in layers during the sintering machine head ash filling process to prevent the sintering machine head ash from clumping during filling. Whenever the tank truck is filled to 25%, the addition of sintering machine head ash is stopped and the anti-caking agent is added separately, so that the sintering machine head ash in the tank truck forms layers. Due to the presence of the anti-caking agent, the accumulation of sintering machine head ash between each layer is reduced. When the tanker truck is 98-99% full, stop adding sintering machine head ash. Then add anti-caking agent separately to prevent the sintering machine head ash from directly contacting the top of the tank. Anti-caking agent is placed on the bottom and top of the tank to avoid sticking. During the transportation of the sintering machine head ash tanker truck, the shaking causes the layered anti-caking agent and sintering machine head ash to impact each other, which makes the sintering machine head ash and anti-caking agent in the tanker truck fully mixed. This reduces the need for the sintering machine head ash to be mixed with the anti-caking agent before being loaded into the tanker truck.

[0014] (3) Calcium oxide acts as a desiccant to absorb moisture from the dust in the sintering machine head to reduce capillary force. Calcium carbonate and blast furnace bag ash act as dispersants between calcium hydroxide generated after calcium oxide absorbs water and sintering machine head ash to prevent calcium hydroxide from sticking together and forming large, sticky lumps. Sodium dodecyl sulfate acts as a filler between calcium hydroxide and the dispersant to prevent calcium hydroxide from clumping together.

[0015] (4) When the amount of anti-caking agent exceeds 8%, the agglomeration strength is effectively reduced. When the amount of anti-caking agent exceeds 10%, the agglomeration strength is basically stable and the inhibition effect remains basically unchanged.

[0016]

[0017] (5) When the particle size of calcium oxide is less than 3 mm, the agglomeration strength is high and the reduction is weak when the calcium oxide ratio is increased. After increasing the particle size of calcium oxide, the strength is significantly reduced. When the particle size of calcium oxide exceeds 5 mm, it cannot be fully mixed with the sintering machine head ash, resulting in stratification and causing the sintering machine head ash to become lumpy. Calcium carbonate as a dispersant needs to be smaller than the calcium oxide particles, and sodium dodecyl sulfate as a filler has a particle size smaller than both calcium oxide and calcium carbonate.

[0018] Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1 This is a schematic diagram of the structure of the storage tank of the present invention.

[0021] Figure 2 This is a schematic diagram of the process for suppressing the ash filling of the sintering machine head according to the present invention. Detailed Implementation

[0022] Example 1:

[0023] The present invention discloses a method for inhibiting agglomeration of sintering machine head ash during canning and transportation. During the canning process of sintering machine head ash, 8% of an anti-agglomeration agent is added to reduce the phenomenon of sintering machine head ash sticking to the can during canning and transportation.

[0024] The composition of the anti-caking agent, by mass percentage, is 65% calcium oxide, 27% calcium carbonate, 6% blast furnace bag ash, and 2% sodium dodecyl sulfate.

[0025] The particle size of the anti-caking agent is as follows: calcium oxide particles with a diameter of 4 mm, calcium carbonate particles with a diameter of 2 mm, and sodium dodecyl sulfate particles with a diameter of 0.1 mm.

[0026] Add 1.5% of the total amount of anti-caking agent to the tank truck, add 25% of the total amount of sintering machine head ash to the tank truck, stop filling the sintering machine head ash, continue adding 1.5% of the total amount of anti-caking agent separately, add 25% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, add 1.5% of the total amount of anti-caking agent separately, add 25% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, add 1.5% of the total amount of anti-caking agent separately, stop adding sintering machine head ash, add 25% of the total amount of sintering machine head ash, stop adding sintering machine head ash, add 2.0% of the total amount of anti-caking agent separately. The amount of caking and sticking to the tank truck in this transportation of sintering machine head ash decreased from 20% to 3%. Compared with the transportation efficiency when no anti-caking agent was added during the filling process of sintering machine head ash, the frequency of tank truck transportation of sintering machine head ash increased from 8 trips / day to 12 trips / day, and the number of tank truck cleaning trips decreased from 2 trips / trip to 6 trips / trip.

[0027] Example 2:

[0028] The present invention discloses a method for inhibiting agglomeration of sintering machine head ash during canning and transportation. During the canning process of sintering machine head ash, 10% of an anti-agglomeration agent is added to reduce the phenomenon of sintering machine head ash sticking to the can during canning and transportation.

[0029] The composition of the anti-caking agent, by mass percentage, is 67% calcium oxide, 28% calcium carbonate, 4% blast furnace bag ash, and 1% sodium dodecyl sulfate.

[0030] The particle size of the anti-caking agent is as follows: calcium oxide particles with a diameter of 3 mm, calcium carbonate particles with a diameter of 1 mm, and sodium dodecyl sulfate particles with a diameter of 0.3 mm.

[0031] Add 2.0% of the total amount of anti-caking agent to the tank truck, add 25% of the total amount of sintering machine head ash to the tank truck, stop filling the sintering machine head ash, and continue to add 2.0% of the total amount of anti-caking agent separately. Add 25% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, and add 2.0% of the total amount of anti-caking agent separately. Add 25% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, and add 2.0% of the total amount of anti-caking agent separately. Add 25% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, and stop adding sintering machine head ash, and add 2.0% of the total amount of anti-caking agent separately. The amount of caking and tank adhesion of sintering machine head ash during this transportation was reduced from 20% to 1%. Compared with the transportation efficiency when no anti-caking agent was added during the filling process of sintering machine head ash, the frequency of tank truck transportation of sintering machine head ash increased from 8 trips / day to 14 trips / day, and the number of tank truck cleaning trips decreased from 2 trips / trip to 8 trips / trip.

[0032] Example 3:

[0033] The present invention discloses a method for inhibiting agglomeration of sintering machine head ash during canning and transportation. During the canning process of sintering machine head ash, 9% of an anti-agglomeration agent is added to reduce the phenomenon of sintering machine head ash sticking to the can during canning and transportation.

[0034] The composition of the anti-caking agent, by mass percentage, is 70% calcium oxide, 25% calcium carbonate, 3% blast furnace bag ash, and 2% sodium dodecyl sulfate.

[0035] The particle size of the anti-caking agent is as follows: calcium oxide particles with a diameter of 2 mm, calcium carbonate particles with a diameter of 1.5 mm, and sodium dodecyl sulfate particles with a diameter of 0.2 mm.

[0036] Add 1.75% of the total amount of anti-caking agent to the tank truck, then add 25% of the total amount of sintering machine head ash to the tank truck. Stop filling the tank truck with sintering machine head ash. Continue adding 1.75% of the total amount of anti-caking agent to the tank truck, then add 25% of the total amount of sintering machine head ash to the tank truck. Stop adding sintering machine head ash, then add 1.75% of the total amount of anti-caking agent to the tank truck, then add 25% of the total amount of sintering machine head ash to the tank truck. Stop adding sintering machine head ash, then add 1.75% of the total amount of anti-caking agent to the tank truck. Add 1.75% of the total amount of sintering machine head ash to the tank truck, stop adding sintering machine head ash, and add 2.0% of the total amount of anti-caking agent separately. The amount of caking and tank adhesion of sintering machine head ash during this transportation was reduced from 20% to 2%. Compared with the transportation efficiency when no anti-caking agent was added during the tank truck loading process, the frequency of tank truck transportation of sintering machine head ash increased from 8 trips / day to 13 trips / day, and the number of tank truck cleaning trips decreased from 2 trips / trip to 7 trips / trip.

[0037] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent controls or modifications made according to the spirit and essence of the main technical solution of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A device for suppressing agglomeration during the transport of sintering machine head ash, characterized in that: A funnel-shaped storage tank is provided above the sintering machine head ash discharge port. The tank opening pipe is connected to the discharge port. The storage tank consists of several groups, and the tank openings are connected in series to the discharge port. The storage tank contains an anti-caking agent, which contains 65-70% calcium oxide, 25-35% calcium carbonate, 4-6% blast furnace bag ash, and 1-3% sodium dodecyl sulfate by mass percentage. The anti-caking agent is used to inject the ash into the tank car in layers during the filling process. The total amount of anti-caking agent added is 8-10% of the total amount of sintering machine head ash.

2. The device for suppressing agglomeration during the transport of sintering machine head ash as described in claim 1, characterized in that: The anti-caking agents are all in the form of fine solid particles, with particle sizes of 3-5 mm for calcium oxide particles, 1-2 mm for calcium carbonate particles, and 0.1-0.3 mm for sodium dodecyl sulfate.

3. The device for suppressing agglomeration during the transport of sintering machine head ash as described in claim 1, characterized in that: The steps for injecting the anti-caking agent into the tanker truck in layers during the filling process include: first, adding 1.0%-2.0% of the total amount of anti-caking agent into the tanker truck; then, adding 25% of the total amount of sintering machine head ash into the tanker truck; stopping the filling of sintering machine head ash and continuing to add 1.5%-2.0% of the total amount of anti-caking agent separately; adding 25% of the total amount of sintering machine head ash into the tanker truck; stopping the addition of sintering machine head ash and adding 1.5%-2.0% of the total amount of anti-caking agent separately; adding 25% of the total amount of sintering machine head ash into the tanker truck; stopping the addition of sintering machine head ash and adding 1.5%-2.0% of the total amount of anti-caking agent separately; adding 25% of the total amount of sintering machine head ash into the tanker truck; stopping the addition of sintering machine head ash and adding 2.0%-2.5% of the total amount of anti-caking agent separately.

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