JPH01258780A - Dry type screening device for particulate material by density - Google Patents

Abstract

PURPOSE:To screen particulate material by densities under a dry condition by inclining an oscillation table longitudinally and transversely, providing a weir to the right ends of the many pieces of horizontally laid riffles and stopping the particulate material tending to advance rightward in the grooves between the riffles at said weir. CONSTITUTION:The weir 2 of a required height is spanned from the mid-point on the rear side part of the oscillation table 1 which consists of a rectangular plate-shaped body, is so inclined as to be higher on the right side than on the left side and is so inclined as to be higher on the rear side than on the front side toward the right lower angle part direction. The plural riffles 3 which are smaller in height than the weir 2 are horizontally provided in approximately parallel at approximately the same intervals on the right side of the weir 2. The table 1 is oscillated horizontally at every small periods. As a result, the particulate matter is efficiently screened by densities from the mixture composed of >=2 kinds of the particulate matter of different densities under a dry condition. For example, coal ashes having a lower unburned carbon content are fractionated from coal ashes contg. the unburned carbon content at a substantially high ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an apparatus for sorting powder or granules according to density from a mixture of two or more types of powder or granules having different densities.

<Prior art> In the separation and removal of unburned coal when reusing coal ash discharged from thermal power plants, and in many other fields, there is a need to separate substances from a mixture of substances with different densities. There are many things.

Conventionally, this sorting device includes a flotation device and a wet rocking table that uses a water stream.

Other shaft-type devices include those that use a combination of gas flow such as air and vibration.

<Problems to be solved by the invention> Since the flotation equipment and the wet rocking table shown as the above-mentioned prior art are both wet types, they are difficult to solve when the target is a water-soluble substance or a substance that must not be wetted. However, there is a problem in that a complicated drying process is required depending on the subsequent usage of the separately collected material. On the other hand, the dry type apparatus is good when the objects to be sorted are large to some extent and there is a considerable difference in density, but when the objects become finer, there is a problem that the sorting efficiency is low even though the apparatus is large-scale.

The object of the present invention is to eliminate the various drawbacks of the prior art and to provide an apparatus that can perform highly efficient sorting even when the objects are minute in a dry process.

Means for Solving the Problems> The above objects of the present invention can be achieved by employing the following means. In other words, the back side of the moving table is made of a rectangular plate-like body, and the right side is sloped so that it is higher than the left side, and the back side of the moving table is also sloped so that it is higher than either the rear side or the front side. A weir of the required height is installed from the middle towards the lower right corner, and on the left side of the turning, multiple rimfuls whose height is smaller than the weir are horizontally installed approximately at the same distance below the weir, This is a dry density sorting device for powder and granular materials, characterized in that the swing table is configured to vibrate minutely periodically in the lateral direction.

Note that in this case, the terms left, right, front, and rear refer to the case where the device of the present invention is viewed from a certain direction, and in the following explanation, that certain direction will be referred to as FIG. 1. is viewed from the front, and the left and right parts of FIG. 1 are the left, right, bottom, and top of the device, respectively, and the front and rear of the device, respectively.

<Operation> What does the device of the present invention do? When a mixed powder with different specific gravity is supplied from the upper part of the left side, that is, from the rear side, while the W motion table is vibrated in a small period in the lateral direction, the groove between the two riffles is In the left-right direction, as with the principle of a general swing table, depending on the difference in density and the size of the particles, high-density particles move to the right, and if the densities are the same, small-diameter objects move to the right. . The powder and granules in the same groove cannot move further to the right because the swing table is lower on the front side (jj+l) and the right side is stopped by the weir for both the left and right side objects. Therefore, the process moves beyond the riffle to the lower groove, and within the lower groove, it is further divided into left and right by density and powder diameter, and by the time it crosses the lowest riffle, there is a small density on the left. Large-diameter particles are unevenly distributed, and as the particles move to the right, the density gradually increases and the particle size becomes smaller. Therefore, multiple collection containers were installed under the riffle on the bottom stage, and each container was separated from the others. If the particles are sampled, it is possible to obtain powder and granules of different densities and particle sizes.

<Example> Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a rectangular plate-like body used for the swing table l of the device of the present invention, and in this embodiment, the length is 300 mm,
A board with a width of 500 mm is used, and on its top surface, a weir 2 with a height of 20 mm is installed diagonally from a part 200 m to the right from the left end of the rear side to the right end of the front side, and on the left side of the turning 2. In addition, a plurality of Watsufuls 3 as shown by the large dimensions (unit: rm) in FIG. 2 were installed horizontally. In this device, such a swing table 1 is
It is tilted at an angle α upward to the right in the left-right direction and at an angle β upward to the right in the front-rear direction with respect to the horizontal plane, and a vibrating device is installed on it.A schematic diagram of this is shown in Part 3. . That is, a rail 5 running left and right is laid on a base 4 placed in a stationary state, a horizontally movable plate 6 with wheels on the lower surface is mounted on the rail 5, and on the horizontally movable plate 6, A left-right tilting plate 7 whose left end is pivotally connected to the left-hand end of the horizontally movable plate 6 and can freely tilt in the left-right direction is placed thereon, and its front end is further pivoted to the front end of the left-right tilting plate 7. A front-rear tilting plate 8 which is freely tiltable in the front-rear direction is mounted, and the above-mentioned swing table 1 is constructed above the front-rear tilt plate 8. The groove between the base of the Watsuful 3 is divided into five equal parts in the left and right direction, and a partition plate 9 is arranged at the left end and between each divided section to communicate with five independent hoppers 10, respectively. A motor 11 is mounted on the horizontally movable plate 6.
A vibrating device consisting of a vibrating mechanism 12 and a vibrating mechanism 12 was attached.
Using this camphor device, the following
Coal ash having a particle size distribution as shown in the table and having a total unburned coal content of approximately 10.1 iu was used as an experimental sample, and various conditions including the left and right tilt α of the rocking table, the front and rear tilt β, and other conditions were used. An experiment was conducted to separate unburned coal from coal ash, which has a lower density than coal ash and a larger particle size for boat fishing.

Table 1 Note that in the particle size section of Table 1 above, -44 means less than 44,
+297 means more than 297, 44-53 means 44 or more 5
The same applies to other ranges that are less than 3 and are indicated by ~.

In other words, for the sake of explanation, this experiment ignored the widths of the weir 2 and riffle 3, and moved the groove closest to the front side of the swing table 1 in the left and right direction, as shown in FIG. Partition plate 9
Divide each area into 5 equal parts A, B, C, D from the right side.
, E, and the grooves were sequentially marked as ■, ■, ■, ■, ■, and ■ from the groove immediately above the groove in which the partition plate 9 was provided to the upper stage, and various experiments were conducted.

First, the coal ash shown in Table 1 above is supplied to the left end of groove ■, α=9.4°, β=28.9°, amplitude about 15M,
Vibration frequency N = 3.5 times/. 1. While holding constant, the hourly supply amount F (kg/h) was varied, and the sample falling downward across the riffle set up on the front side of the swinging table was sampled in the above A, B,... Samples were taken from each region, and the unburned coal contained in each sample was burned in an electric furnace at 800°C for 1 hour, and the Ig at that time was determined.

The graph in FIG. 5 shows the results of experiment 1 in which the unburned coal content in each region was determined using the It oss value. Note that the numbers written next to each point in FIG. 5 indicate the collection ratio in each collection area when the panoramic view of each supplied sample is taken as 1.

From the graph shown in Figure 5, it can be seen that the sample collected from the right side of the swing table, regardless of the supply amount F per hour, has less unburned coal, but the smaller the amount of F, the more the entire sample shifts to the right side. At the same time, it can be seen that the separation between coal ash and unburned coal becomes more rapid.

Next, the test supply point, α, β, and amplitude were the same as in Experiment 1 above, and F = 0.709 kg/h, and in Experiment 2, the unburned coal content was determined in the same way by changing the frequency N. The results are shown in the graph of FIG. 6. The numbers written next to each point in FIG. 6 indicate the sampling rate in that area, as in the case of FIG. 5.

From FIG. 6, it can be seen that when the frequency N is large, the left and right spread becomes large.

Next, in the graph shown in Figure 7, the sample supply point, amplitude and F are the same as in Experiment 2, N = 3.55', β = 2
This shows the results of Experiment 3 in which α was kept constant at 8.9 @ and variously varied.The numbers written next to each point in this Figure 7 indicate the sampling in that area, as in Figure 5. Show percentage.

From FIG. 7, it can be seen that if α is too large, the sample will shift to the left side, resulting in a small lateral spread and poor sorting efficiency, so it is necessary to set α to a value that is not too large.

Next, the graph shown in FIG. 8 shows α=9.4° and F=2.
Experiment 3 above, except that the weight was kept constant at 4 kg, and β was varied.
This shows the results of Experiment 4 conducted under the same conditions as .

From this Figure 8, it can be seen that if the front and rear inclinations are made too large, the horizontal spread of the sample will be small, and even in the A-Si region, where it is thought that the highest density of materials will gather, there is still a considerable amount of unburned coal. It can be seen that the sorting efficiency is not good.

Next, the graph shown in Figure 9 shows the sample supply point and amplitude.

The frequency, F and α are the same as in Experiment 4, β = 22.4
゜, and after some sorting operation, the sample moves from groove ■ to groove ■ and to the groove below groove ■, and when a small amount starts to fall from there to the hopper IO below, the sample in each groove is Take out the sample and calculate the Ig of the sample for each groove and each region, 1. This shows the results of Experiment 5 in which oss was determined.

From FIG. 9, it can be seen that although there are some places where the samples are reversed, the slope of the sample in the lower groove is steeper, that is, the specific gravity has been sufficiently sorted.

Next, Fig. 10 shows that under the same conditions as in Experiment 5 above, the samples collected in the hopper 10 after passing through the lowest Watsufuru are sieved for each size, and the cumulative weight percentage under the sieve in that case is This graph shows the results of Experiment 6, which determined the average of 1 g and loss in each region.

From the results shown in Figure 10, compared to the original sample used first,
A: It can be seen that most of the samples collected from the Beff area, that is, the right side area, have small diameters, and the opposite is true for the left side area.

In addition, the graph shown in FIG. 11 shows the results of Experiment 7, in which Ig,
From FIG. 11, it can be seen that the samples are divided into left and right in this order from the smallest density to the largest density, regardless of the diameter of the collected sample.

<Effects of the Invention> As described above, according to the device of the present invention, the swing table is tilted left and right and front and back, and a weir is provided at the right end of a large number of horizontally installed riffles, and the inside of the groove between the riffles is moved to the right. In order to stop the moving powder and granular material there, the amount of powder and granular material passing over the lower riffle and moving into the lower groove increases, and even within the same groove, the density is divided into strips on the left and right. Particles are sorted by size, and the weir is installed diagonally, and the lower groove is set longer to the right, so particles with high density and small diameter gathered near the right end of each part are passed through the lower groove. Since this is repeated, the powder and granules that have reached the front side of the swing table are sufficiently separated into right and left parts according to density and two particle sizes.

Therefore, if the angle of inclination of both heads of the rocking plate, the vibration condition, the supply amount of raw powder and granules, etc. are changed appropriately according to the target raw powder and granules,
Even if the raw powder granule contains two or more substances with different densities and diameters, it can be collected as a substance consisting mainly of these components.For example, the unburned coal used as a sample in the example It is possible to separate coal ash with a small amount of unburned coal from coal ash that contains a considerable amount of coal, contributing to subsequent reuse.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the shape of the swing table of the device of the present invention, Fig. 2 is an enlarged sectional view taken along line 1an-n, and Fig. 3 is a partially cutaway perspective view showing an example of the device of the present invention. , Fig. 4 is a schematic diagram with numbers and symbols attached to each part of the swing table to explain each experiment shown in the examples of the present invention, and Fig. 5 shows the state of separation of coal ash and unburned coal in the original sample. A graph showing how it changes when the supply amount is changed. Figure 6 is a graph when the same frequency is changed. Figure 7 is a graph when the same α is changed. Figure 8 is a graph when the same β is changed. Fig. 9 is a graph when the sampling location of the same sample is changed, Fig. 10 is a graph showing the distribution of the amount for each particle size at each sampling location.
FIG. 11 is a graph showing the separation status of coal ash and unburned coal for each particle size at each sampling location. In the figure, 1: Swing table 2: Weir 3: Riffle Patent applicant Director of the Agency of Industrial Science and Technology (1 other person) Sub-agent Noriharu Ariyoshi Figure 1 Figure 2 Figure 4 Figure 85 Figure 6 Collection U area Fig. 7 Collection tll @ Fig. 8 Probing ear 2τ! Area Figure 9 Figure 10 Figure 1/Figure Grain size (, um)

Claims (1)

[Claims] 1. A rocking table consisting of a rectangular plate-shaped body, tilted so that the right side is higher than the left side, and further tilted so that the rear side is higher than the front side. A weir of the required height is installed across the lower corner, and on the left side of the weir, a plurality of riffles whose height is smaller than that of the weir are horizontally installed at approximately the same distance below the weir, and the above-mentioned oscillator is 1. A dry density sorting device for powder and granular materials, characterized in that a moving table is configured to vibrate minutely periodically in the lateral direction.