TW201831854A - Method and apparatus for charging metal oxide composite pellet - Google Patents

Abstract

The present invention provides a method and an apparatus for charging metal oxide composite pellet. The apparatus includes a discharging unit, a transporting unit, a powder-removing unit, a distributing unit and a count-and-arrange unit. The method includes a filtering and screening step, a distributing step and a counting and arranging step. A tall-pellet bed structure of the metal oxide composite pellet is formed by applying the apparatus and the method.

Description

 Method and device for fabricating metal oxide composite pellets  

The present invention relates to a method and apparatus for fabricating a metal oxide composite pellet, and more particularly to a method and apparatus for fabricating a stacked structure of metal oxide composite pellets having a high number of layers. By the stacking structure of the high-level number, the metallization rate of the metal oxide composite pellets to form direct reduced iron (DRI) after high-temperature carbothermal reduction reaction can be increased.

A metal oxide-rich raw material (such as iron ore) and a reducing agent (such as coal) are mixed and made into a composite pellet, and the composite pellet is subjected to a carbothermal reduction reaction at a high temperature to directly produce a specific metal (for example, direct reduction) iron). At present, in the process technology using the above principle, Rotary hearth furnace (RHF) and ITmk3 non-blast furnace iron making method are more common. In the above two processes, the composite pellets are attached to an annular hearth that continuously performs a circular motion, and are uniformly stacked in layers of 1 to 2. In order to allow the composite pellets to be continuously laid on an annular hearth, corresponding fabric techniques and devices have been developed.

There is currently a distribution device comprising a transfer unit, a platform, a leveling gauge and a plurality of longitudinal partitioning devices, wherein the leveling gauge is used to control the amount of feed, and the plurality of longitudinal partitioning devices are erected on the circumferential track of the rotary kiln. After the composite pellets are uniformly dispersed by the separating device, they can be directly laid on the rotary kiln.

There is another cloth device that includes a belt conveyor and a plurality of blades that are placed on the belt conveyor. The above-mentioned distributing device is disposed on the rotary kiln to perform the fabric under the continuous rotation of the rotary kiln. The inclined plurality of scrapers separate a plurality of grooves inclined in the traveling direction of the belt conveying device, thereby guiding the composite pellets to be evenly distributed on the circumferential orbit of the rotary kiln.

The above-mentioned technology is limited to the operating conditions of the rotary kiln, and the composite pellets laid can only reach a height of 1 to 2 layers. Since the amount of gas produced by the 1 to 2 composite pellets during the reaction process (reducing gas such as carbon monoxide) is insufficient, the reduced metal is easily oxidized again in the oxidizing atmosphere in the rotary kiln, resulting in metallization of the composite pellets. The rate is low. Furthermore, the composite pellets are directly laid on the hearth, and it is easy to bring the broken pellets and the powder into the hearth, resulting in disadvantages such as uneven heating of the composite pellets and large amount of exhaust powder.

In view of the above disadvantages, another technique proposes to increase the height of the composite pellets to at least 4 layers to increase productivity. However, this technique is a small-scale experiment at the laboratory level, and it does not provide any stacking method that can be used in the production process.

Based on the above various problems, there is no need to propose a method and a device for laying metal oxide composite pellets, which can efficiently form a metal having a flat surface, a uniform shape, a complete shape, no crushed material or powder, and having a high-rise number. The stacked structure of oxide composite pellets can be applied to the mass production process in the field. By the proposed cloth method and apparatus, it is possible to help to improve the metallization rate and the yield of the metal oxide which is subsequently subjected to the high-temperature carbothermal reduction reaction to metal.

Accordingly, an aspect of the present invention is to provide a distributing device which can be used to automatically form a stacked structure of metal oxide composite pellets having a high number of layers, which is flat, uniform, shape-complete, free of crushed material or powder.

Another aspect of the present invention provides a method of fabricating a metal oxide composite pellet to form a stacked structure as described above.

According to the above aspect of the invention, a cloth device is proposed. In an embodiment, the above-mentioned distributing device may include a discharging unit, a transport unit, a crushing material or a fine powder screening unit, a dispensing unit, and a metering cloth unit. The discharging unit comprises a receiving groove provided with a feeding port and a discharging port, and an extraction baffle provided at the discharging port. The transport unit has opposite first and second ends, wherein the first end is coupled to the discharge port and the material transport direction of the transport unit is from the first end to the second end. The crushing material or fine powder screening unit has opposite third and fourth ends, wherein the third end is higher than the fourth end, and the second end is disposed on the third end. The distribution unit comprises a swash plate and a plurality of grooves disposed on the slant plate, wherein the slant plate has opposite fifth and sixth ends, the fifth end is higher than the sixth end, and the groove is along the fifth end to the sixth The first direction of the end extends, and the fourth end is connected to the fifth end. The metering cloth unit comprises a receiving groove, a weighing device disposed under the receiving groove, and a reciprocating driving device connected to the receiving groove. The sixth end is disposed on the opening of the receiving groove, and the bottom of the receiving groove is provided with a multi-leaf type cloth valve group. The reciprocating drive device can drive the receiving groove to reciprocate in the second direction, and the second direction is a horizontal projection of the first direction.

According to an embodiment of the present invention, the cloth distributing device may further include a trolley adjacent to the metering cloth unit, wherein the trolley includes an accommodation space.

According to an embodiment of the invention, the trolley is a tunnel kiln bed trolley.

According to an embodiment of the invention, the crushing material or fine powder screening unit and/or the dispensing unit further comprises a vibration unit.

According to an embodiment of the present invention, the crushing material or the fine powder screening unit comprises a screen, and the crushing material or the fine powder collecting tank may be disposed under the screen.

According to the above aspect of the invention, a method of fabricating a metal oxide composite pellet is proposed. In one embodiment, a plurality of metal oxide composite pellets are first provided. Next, the metal oxide composite pellet is subjected to a sieving step to remove the crushed material and the fine powder of the metal oxide composite pellet. Then, the metal oxide composite pellet is subjected to a pellet distribution step, wherein the pellet distribution step is included on the inclined surface, and the metal oxide composite pellets are uniformly dispersed along the oblique direction of the slope to form a metal oxide composite pellet Multiple substreams. Next, the metal oxide composite pellets are subjected to a metering and fabricating step to form a stacked structure, wherein the metering and fabricating step may comprise the following steps: (1) combining the metal oxide composite pellets of each of the substreams described above, The sequence is placed in the trough body, wherein the trough system reciprocates in a horizontal projection direction of the oblique direction; (2) a metal oxide composite pellet in the trough body is subjected to a weighing step to obtain a metal oxide composite The weight of the pellets, wherein the number of layers of the stacked structure is converted by weight, and the number of layers of the stacked structure is 4 to 9 layers.

According to an embodiment of the present invention, the cloth method may further include an accommodating step of accommodating the stacking structure in the tunnel kiln bed trolley.

According to an embodiment of the invention, the accommodating step may include opening the multi-leaf type cloth valve group at the bottom of the tank body, and setting the tunnel kiln bed trolley under the multi-leaf type cloth valve group.

According to an embodiment of the present invention, the pellet dispensing step is performed by a dispenser, the dispenser including the inclined surface, and the inclined surface is provided with a plurality of grooves along the oblique direction.

According to an embodiment of the invention, the metal oxide composite pellets have a particle size of from 10 mm to 25 mm.

According to an embodiment of the invention, the metal oxide composite pellet comprises a metal oxide and a reducing agent.

By using the cloth method and apparatus for metal oxide composite pellets of the present invention, a stacked structure of metal oxide composite pellets having a flat, uniform, complete shape, no crushed material or powder, and having a high number of layers can be obtained. The stacked structure of the above-mentioned high-rise number facilitates the progress of the high-temperature carbothermal reduction reaction, and can effectively increase the metallization rate of the metal oxide by carbothermal reduction.

1‧‧‧Pellet

100‧‧‧ cloth installation

110‧‧‧Drawing unit

112‧‧‧ Feed inlet

114‧‧‧Outlet

111‧‧‧ accommodating slots

113‧‧‧ lead baffle

120‧‧‧Transportation unit

121‧‧‧ first end

123‧‧‧second end

130‧‧‧Crushing or fine powder screening unit

131‧‧‧ third end

133‧‧‧ fourth end

132‧‧‧ mesh

134‧‧‧Crushing or fine powder recovery tank

140‧‧‧Distribution unit

141‧‧‧ fifth end

142‧‧‧ sloping plate

143‧‧‧ sixth end

144‧‧‧ trench

146‧‧ ‧ baffle

150‧‧‧Measuring fabric unit

151‧‧‧ socket

151A‧‧‧ openings

152‧‧‧Multi-leaf fabric valve set

152A‧‧‧ leaves

153‧‧‧Weighing device

155‧‧‧Reciprocating drive

160‧‧‧First direction

170‧‧‧second direction

180‧‧‧Trolley

181‧‧‧ accommodating space

183‧‧‧Wall

190‧‧‧Stack structure

200‧‧‧Tunnel Kiln

400‧‧‧ cloth method

410, 420, 430, 440‧ ‧ steps

A better understanding of the aspects of the invention can be obtained from the following detailed description taken in conjunction with the drawings.

1 is a schematic cross-sectional view of a distributing device according to an embodiment of the present invention; [FIG. 2] shows a crushing or fine powder screening unit and a dispensing unit of the distributing device of FIG. FIG. 3 is a cross-sectional view showing a tunnel kiln bogie and a tunnel kiln according to an embodiment of the present invention; and FIG. 4 is a cross-sectional view showing an embodiment of the present invention Schematic flow chart of the cloth method.

The object of the present invention is to provide a method and a device for distributing metal oxide composite pellets to automatically form a stack of metal oxide composite pellets which are smooth, uniform, shape-complete, free of crushed material or powder, and have a high number of layers. structure. The above stacked structure can be applied to a high temperature carbothermal reduction reaction to increase the metallization rate and yield of the metal oxide reduced to metal.

The metal oxide composite pellets referred to herein as the invention may have a particle size of from 10 mm to 25 mm. The metal oxide composite pellets comprise a metal oxide and a reducing agent. In an embodiment, specific examples of the metal oxide may include, but are not limited to, iron oxide, aluminum oxide, cerium oxide, molybdenum oxide, chromium oxide, tungsten oxide, magnesium oxide, cobalt oxide, titanium oxide, nickel oxide, copper oxide, Lead oxide, calcium oxide, cerium oxide, manganese dioxide, zirconium oxide, tin oxide, zinc oxide, vanadium oxide, any combination of the above, or a mineral containing one or more of the above components. In one example, iron ore can be used, for example, as a material for the metal oxide. The reducing agent may comprise a carbon reducing agent for carbothermal reduction, and specific examples may be, for example, carbon black, activated carbon, coal, coke, graphite, charcoal or any combination of the above.

In one embodiment, the metal oxide composite pellets are used in an amount of 100 parts by weight, the metal oxide may be used in an amount of 70 parts by weight to 90 parts by weight, and the reducing agent may be used in an amount of 10 parts by weight to 30 parts by weight. Parts by weight.

The high temperature carbothermal reduction reaction referred to herein as the present invention can be carried out, for example, in a tunnel kiln.

The term "high temperature" as used herein means a temperature greater than 1200 ° C to 1570 ° C.

The surface referred to herein as being flat and uniform means that the height of the uppermost surface of the stacked structure is substantially uniform to achieve a uniform heating effect.

The term "integral shape" as used herein means that a single metal oxide composite pellet in a stacked structure maintains a complete spherical shape and is not broken by factors such as impact during the fabric process.

Please refer to FIG. 1 , which is a schematic cross-sectional view of a distribution device according to an embodiment of the invention. As shown in FIG. 1, the distributing device 100 includes a discharging unit 110, a transport unit 120, a crushing or fine powder screening unit 130, a dispensing unit 140, and a metering cloth unit 150.

The discharge unit 110 includes a receiving groove 111 having a feed port 112 and a discharge port 114, and a take-up flap 113 provided at the discharge port 114. The above-mentioned extraction baffle 113 is used to control the discharge amount of the discharge unit 110 (for example, the number of metal oxide composite pellets).

The transport unit 120 has a first end 121 and a second end 123 opposite thereto, wherein the first end 121 is connected to the discharge port 114, and the material transport direction of the transport unit 120 is from the first end 121 to the second end 123. In an embodiment, the transport unit 120 can be, for example, a belt conveyor. In particular, the transport unit 120 can slow down the impact force of the metal oxide composite pellets from the output of the discharge port 114, thereby maintaining the shape of the metal oxide composite pellets intact. If the transport unit 120 is not provided, and the discharge port 114 is directly connected to the crushing material or fine powder screening unit 130 described later, the metal oxide composite pellets may be damaged in shape by mutual extrusion and gravity acceleration. Incompletely shaped metal oxide composite pellets can affect the consistency of the stack structure and are not conducive to the high temperature carbothermal reduction reaction.

Please refer to FIG. 2 together, which is a top view of the crushing material or fine powder screening unit and the dispensing unit of the cloth device of FIG. 1 . The crushing material or the crushing material or fine powder screening unit 130 has a third end 131 and a fourth end 133 opposite to each other, wherein the third end 131 is higher than the fourth end 133, and the second end 123 is disposed on the third end 131. For receiving materials on the transport unit 120 (such as the pellet 1 shown in Figure 1). With the third end 131 being higher than the fourth end 133, the metal oxide composite sphere in the crushed material or fine powder screening unit 130 can be moved by gravity, however, the crushed material or fine powder screening unit 130 can additionally include vibration. A device (not shown) is provided to assist in the movement of the metal oxide composite sphere.

In one embodiment, as shown in FIG. 2, the crush or fines screening unit 130 can be, for example, a screen having a plurality of meshes 132. In one example, the mesh 132 can screen for crushed or fines having a particle size of less than 10 mm. In other embodiments, the mesh size of the screen can be adjusted according to the needs of use, and the present invention is not limited to the size of the mesh disclosed.

In some embodiments, a crushed material or fine powder recovery tank 134 may be disposed under the crushed material or fine powder screening unit 130 to recover crushed or fine powder that is screened out because the particle size is smaller than the mesh size. In some examples, the above ground material or fine powder may be subjected to a granulation step to form a metal oxide composite sphere.

The distribution unit 140 includes a swash plate 142 and a plurality of grooves 144 (shown in FIG. 2), wherein the swash plate 142 has a fifth end 141 and a sixth end 143 opposite to each other, and the fifth end 141 is higher than the sixth end 143. The groove 142 extends in a first direction 160 of the fifth end 141 to the sixth end 143, and the fourth end 133 is coupled to the fifth end 141 such that the screened material can be transported to the dispensing unit 140. The fifth end 141 of the slanting plate 142 is higher than the sixth end 143, and the metal oxide composite ball can be moved by gravity. However, the distribution unit 140 can additionally include a vibration device (not shown) to assist the metal oxide composite. The movement of the sphere. In one embodiment, the number and width of the grooves 142 can be adjusted according to the needs of use, and only a single groove width is at least wider than the particle size of the metal oxide composite pellets. In an embodiment, the sixth end 143 of the swash plate 142 of the dispensing unit 140 may further include a baffle 146 for stopping the input of the metal oxide composite pellets into the metering fabric unit 150 described below.

The metering and distributing unit 150 includes a receiving groove 151, a weighing device 153 disposed under the receiving groove 151, and a reciprocating driving device 155 connected to the receiving groove 151. The sixth end 143 of the dispensing unit 140 is disposed on the opening 151A of the receiving groove 151 so that the material can be received in the receiving groove 151. A multi-leaf type cloth valve group 152 is disposed at the bottom of the receiving groove 151. The reciprocating drive 155 can drive the receiving groove 151 to reciprocate in the second direction 170 and the second direction 170 is a horizontal projection of the first direction 160. In an embodiment, the displacement distance of the reciprocating movement of the receiving groove 151 can be, for example, the length of the groove of the receiving groove 151, or is not limited to the length of the groove of the receiving groove 151 of 4/5. In another embodiment, the speed of the reciprocating motion as well as the displacement distance can be adjusted according to the needs of use.

Please refer to FIG. 1 and FIG. 3 together, which are schematic cross-sectional views of a tunnel kiln bogie and a tunnel kiln according to an embodiment of the present invention. In an embodiment, the distribution device 100 may further include a trolley 180 disposed adjacent to the metering fabric unit 150. The trolley 180 may include an accommodation space 181 formed by the fence 183. In an embodiment, the trolley 180 can be, for example, a tunnel kiln bed trolley, which can be applied to a stack structure of accommodating metal oxide composite pellets to perform high temperature carbothermal reduction reaction using the tunnel kiln 200 to obtain high metallization. Rate and high yield of metal pellets.

The number of the blades 152A of the multi-leaf type cloth valve group 152 described above is not particularly limited, but the multi-leaf type cloth valve group must completely set the stacking structure in the receiving groove 151 (see below for details). Enter the trolley 180. If the multi-leaf type valve group is replaced by a single-open valve, the time when the stack structure 190 falls into the trolley 180 may be inconsistent, causing the stack structure 190 to be damaged, and there is a concern that the unevenness is uniform.

Next, the cloth method 400 of the metal oxide composite pellet of the present invention will be described in detail with reference to FIGS. 1 to 4. 4 is a schematic flow chart of a method of fabricating according to an embodiment of the present invention.

In step 410, a plurality of metal oxide composite pellets (hereinafter referred to as pellet 1) are first provided. As shown in FIG. 1, the pellet 1 is placed in the receiving slot 111 from the feed port 112 of the discharge unit 110, and is output from the discharge port 114 to the transport unit 120. In an embodiment, the height of the take-up flap 113 can be adjusted to determine the opening size of the discharge opening 114 so that the discharge speed can be adjusted. When the desired discharge amount is reached, the discharge port 114 can be closed by the take-up flap 113. The output pellet 1 is conveyed to the breaker or fine screening unit 130 via the transport unit 120. In an example, the overall fabric process speed can be controlled by adjusting the opening size of the discharge port 114 determined by the take-up flap 113 and the operating speed of the transport unit 120.

Next, in step 420, the metal oxide composite pellet is subjected to a sieving step. The pellet 1 is crushed or fined in the pellet 1 by a force provided by gravity or an additional vibration device (not shown) on the crushing material or fine powder screening unit 130 having a specific mesh size. After the powder is removed, it is continuously delivered to the dispensing unit 140. In one example, the sieving step screens out pellets or fines of less than 10 mm. In another example, the sieving step of step 420 may include the step of recovering the sieved fines or fines by crushing or fines recovery tank 134, and re-granulating the recovered broken or fine powder. step.

In particular, if the step of screening the crushed material or the fine powder is not performed, when the stacked structure of the pellets 1 is formed (such as the stacked structure 190 of FIG. 3), the crushed material or the fine powder blocks the pellets and the pellets. The gap between them. If the above stacked structure is subjected to a high-temperature carbothermal reduction reaction, the metal oxide composite pellets located under the stacked structure cannot be reduced by receiving radiant heat through the voids, resulting in a decrease in the metallization rate of the metal oxide composite pellets.

Then, as shown in step 430, a pellet distribution step is performed on the metal oxide composite pellets. Preferably, the pellet dispensing step can be performed, for example, using the dispensing unit 140. The pellet dispensing step is included on the ramp 142, and the pellet 1 is uniformly dispersed along the oblique direction of the ramp (i.e., the first direction 160 described above) to form a plurality of substreams 146 of the pellet 1.

Thereafter, as shown in step 440, the metal oxide composite pellets are subjected to a metering and fabricating step to form a stacked structure having a uniform height and a uniform number of layers. The step of measuring the cloth comprises the steps of: (1) sequentially arranging the pellets 1 of each substream 146 into the receiving grooves 151 of the metering cloth unit 150; (2) the pellets 1 in the receiving groove 151 A weighing step is performed to obtain the weight of the pellet 1. The number of layers of the stacked structure 190 can be calculated by dividing the weight obtained (i.e., the total weight of the stacked structure 190) by the weight of the single layer pellet 1 in the receiving groove 151. In an embodiment, the number of layers of the stacked structure 190 can be 4 to 9 layers.

While receiving the pellet 1, the receiving groove 151 is reciprocated in a second direction 170 of horizontal projection in the first direction 160. By the reciprocating motion described above, the pellet 1 that touches the groove wall of the receiving groove 151 can be uniformly dispersed in the receiving groove 151. In an example, the reciprocating motion described above can be achieved, for example, by reciprocating drive 155. In another example, the weight of the pellet 1 is measured by a weighing device 153 disposed under the receiving slot 151. In one example, when the aforementioned stack structure 190 reaches a predetermined number of layers (4 to 9 layers), the baffle 146 on the slope 142 can block the metal oxide composite pellet from continuing to be input into the receiving groove 151.

In some embodiments, the cloth method can further include an accommodating step. When the aforementioned stack structure 190 reaches a predetermined number of layers (4 to 9 layers), the receiving groove 151 can be moved onto the trolley 180. Further, the multi-leaf fabric valve group 152 of the receiving groove 151 is simultaneously opened to completely accommodate the stack structure 190 in the accommodating space 181 of the trolley 180. Thereafter, the trolley 180 can be sent, for example, to a tunnel kiln for high temperature carbothermal reduction.

If the reciprocating motion described above is not performed, a flat, uniform stack structure of the surface cannot be formed, thereby affecting the heat uniformity of the stacked structure. If the number of layers of the stacked structure is less than 4 layers, in the high-temperature carbothermal reduction reaction, sufficient carbon monoxide reducing gas to protect the pellet 1 cannot be produced, resulting in a low metallization rate of the pellet 1. On the other hand, if the number of layers of the stacked structure is greater than 9 layers, the excessively thick stacked structure causes the radiant heat of the carbothermal reduction reaction to be not transmitted to the pellets 1 of the underlayer, which also causes a decrease in the metallization rate of the integral metal oxide composite sphere.

It should be noted that the cloth method and the device of the present invention load the stack structure of the metal oxide composite pellets in a batch type in a reciprocating trolley, and then move the trolley to the furnace after being flattened and stacked. A high temperature carbothermal reduction reaction is applied to the stacked structure. However, when the stack structure in the trolley performs a high-temperature carbothermal reduction reaction, the cloth device can continue to carry out the fabric of the other metal oxide composite pellets, so the cloth device and method of the present invention can automatically and continuously form the surface. A stacking structure of metal oxide composite pellets having a flat, uniform, intact shape, no crushed material or powder, and having a high number of layers.

In one embodiment, the metal oxide composite pellets are composed of 80 parts by weight of iron ore (iron content of 65% by weight) and 20 parts by weight of coal. The above metal oxide composite pellets are formed into a stacked structure by using the distributing device 100 of FIG. 1 and the cloth method 400 of FIG. 4, wherein the number of layers of the stacked structure is 7 layers. The above stacked structure was subjected to a carbothermal reduction reaction at 1500 ° C for 60 to 70 minutes in a tunnel kiln. In this specific example, the metal oxide composite pellet has a metallization ratio of 85% or more.

A fabric method and apparatus for applying the metal oxide composite pellet of the present invention, by using a discharge unit, a transport unit, a crushing or fine powder screening unit, a dispensing unit, and a metering cloth unit of a specific combination in the distributing device The sieving step, the pellet dispensing step, and the metering fabric step are performed to obtain a stacked structure of metal oxide composite pellets having a flat surface, uniformity, and a high number of layers. The stacked structure of the above-mentioned high-rise number facilitates the progress of the high-temperature carbothermal reduction reaction, and can effectively improve the metallization rate and the yield of the metal oxide by carbothermal reduction to metal.

While the invention has been described above in terms of several embodiments, it is not intended to limit the scope of the invention, and the invention may be practiced in various embodiments without departing from the spirit and scope of the invention. The scope of protection of the present invention is defined by the scope of the appended claims.

Claims (11)

 A fabric device comprising: a discharge unit comprising: a receiving groove, a feeding port and a discharging port; and a lead-out baffle disposed at the discharging port; a transport unit having a relative a first end and a second end, wherein the first end is connected to the discharge port, and a material transport direction of the transport unit is from the first end to the second end; a crushed material or a fine powder sieve a dividing unit having a third end and a fourth end, wherein the third end is higher than the fourth end, and the second end is disposed on the third end; a dispensing unit includes a swash plate and a plurality of grooves are disposed on the swash plate, wherein the swash plate has a pair of fifth ends and a sixth end, the fifth end is higher than the sixth end, and the grooves are along the fifth end a sixth end of the sixth end is extended, and the fourth end is connected to the fifth end; and a metering fabric unit comprises: a receiving slot, wherein the sixth end is disposed on an opening of the receiving slot And one of the bottoms of the receiving groove is a multi-leaf type cloth valve group; a weighing device is disposed under the receiving groove; A reciprocation driving device connected to the receiving groove, a second direction to drive the receiving groove in the horizontal projection of the first direction is a reciprocating movement.    The cloth device of claim 1, further comprising a vehicle adjacent to the metering cloth unit, wherein the vehicle comprises an accommodation space formed by a wall.    The cloth device of claim 2, wherein the trolley is a tunnel kiln bed trolley.    The cloth device of claim 1, wherein the crushing material or fine powder screening unit and/or the dispensing unit comprises a vibration unit.    The cloth device of claim 1, wherein the crushing material or fine powder screening unit comprises a screen, and a crushing material or a fine powder collecting tank is disposed under the screen.    A method for fabricating a metal oxide composite pellet comprises: providing a plurality of metal oxide composite pellets; performing a screening step on the metal oxide composite pellets to remove the metal oxide composite pellets a crushing material or a fine powder; performing a pellet distribution step on the metal oxide composite pellets, wherein the pellet dispensing step is included on a slope, and the metal oxide is uniformly dispersed along an oblique direction of the slope Compounding pellets to form a plurality of substreams of the metal oxide composite pellets; and subjecting the metal oxide composite pellets to a metering fabric step to form a stacked structure, wherein the metering fabric step comprises Disposing the metal oxide composite pellets in each of the substreams in a tank, wherein the groove system performs a reciprocating motion in a direction of horizontal projection of the oblique direction; And performing a weighing step on the metal oxide composite pellets in the tank to obtain a weight of the metal oxide composite pellets, wherein the number of layers of the stacked structure is based on The weight is converted, and the number of layers of the stacked structure is 4 to 9 layers.    The method for fabricating a metal oxide composite pellet according to claim 6, further comprising an accommodating step of accommodating the stacked structure in a tunnel kiln In the trolley.    The method for fabricating a metal oxide composite pellet according to claim 7, wherein the accommodating step comprises opening a multi-leaf cloth valve group at the bottom of the tank body, and the tunnel kiln hearth is The trolley is located under the multi-leaf fabric valve set.    The method for fabricating a metal oxide composite pellet according to claim 6, wherein the pellet dispensing step is performed by a dispenser, the dispenser including the slope, and the slope is disposed along the oblique direction There are multiple grooves.    The method for fabricating a metal oxide composite pellet according to claim 6, wherein one of the metal oxide composite pellets has a particle diameter of 10 mm to 25 mm.    The method of fabricating a metal oxide composite pellet as described in claim 6, wherein the metal oxide composite pellet comprises a metal oxide and a reducing agent.