FI76502C - PROCESSING OF CHEMICALS IN THE PROCESSING OF CHEMICALS AND PROCESSING AND PROCESSING. - Google Patents

Description

! 76502

METHOD AND APPARATUS FOR FEEDING AND / OR SAMPLING CHEMICALS IN THE PROCESS

This application has been separated from patent application No. 5 Θ240Θ0 by division.

The invention relates to a method and a device according to the preambles of claims 1 and 2 for feeding chemicals into a process and / or for taking samples from the process.

10

The ore sludge treatment units essentially related to the concentrator's flotation process are manifolds, sludge distributors, flotation cells and pump wells. The slurry stream is directed to one of the 15 flotation cells or to several flotation cells connected in parallel via a slurry distributor.

There may be a plurality of flotation cells connected in series so that the slurry flows first into the first cell and from there to the next and beyond. This requires the placement of valves or the like between two successive cells. As the liquid level in the latter cell decreases, more sludge is taken from the previous cell or the splitter. As a valve, the so-called Jetku-25 valve located in a pipe leading out of the cell. The operation of the valve is controlled by various mechanical or electrical surface height monitoring devices. The aim is to keep the surface height approximately constant in each cell or cell unit.

30

From the flotation cells, the intermediate is directed to the pump wells, from where it is pumped again to the process or to the distributor 11e / Jiette of the next enrichment process. The waste sludge from the cells is in turn directed via pump wells 35 to a landfill or suitable after-treatment.

2 76502

Sludge pumping to the pump well usually takes place without adjustment. However, the sludge flow can be adjusted by changing the speed of the pump or by means of a valve by restricting the flow 1 on the pressure side of the pump by means of the front valve.

5

The difficulties in adjusting the concentrator are mainly due to the fact that 1 there are currently no satisfactory equipment solutions for regulating flow rates, sampling and dispensing chemicals. Under these conditions, 10 inlet valves are most often used to control the flow flows. Given that the dry matter content of the sludge is several tens of percent, up to 70%, it is understood that the service life of the inlet valve is very short. On the other hand, it also requires a relatively large amount of space. Space is also needed in order to be able to replace the valves by the time they become unusable. As a result, the cells have in practice been forced to be spaced apart. The difficult adjustability of the Let valve also causes great difficulties in handling the sludge flows. In addition, it should be noted 20 that during electrical disturbances, the hose valves usually open and even large amounts of expensive sludge may be wasted.

With the method and device according to the invention, problems related to sampling and / or the addition of chemicals can be solved. To achieve this, the invention is characterized by what is set out in the appended claims.

The invention achieves the following considerable advantages in terms of maintenance and process control. The valve for sampling can be connected to the slurry piping at a point deemed suitable. By shaping the valve housing in a certain way, the sludge passing through the piping is made in a swirling motion, whereby the sample is of uniform quality. Utilizing the stem part of the valve, the supply of chemicals can be carried out to a reference object which is advantageous from the point of view of mixing in the process.

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In the event of process disturbances, it is possible to open and flush the valve, any venl brick housing and piping using compressed air or water. The operation can take place completely automatically under the control of a suitable data processing unit 5 from the control room or manually.

In the following, the invention will be explained in detail with reference to the accompanying drawings.

Figure 1 schematically shows a flotation circuit; Figure 2 shows in more detail a valve, partly in side view, in a sectional view;

Figure 3 shows a side view of another valve provided with a housing;

Figure 4 shows a top view of a valve which, according to the invention, is particularly suitable for sampling and / or dispensing chemicals.

The ore sludge treatment units 20 of the flotation circuit of Figure 1 are pump wells 1, 2 and 3, a splitter / sludge distributor 12 and flotation cells 13, 14, 15 and 16. Each treatment unit is provided with one or more valves, the structure of which is described in detail in Finnish patent application. No. 824079. The valves of Fig. 1 are up-25 down valves 17, 18, but valves with a housing can also be used instead.

The valve generally comprises coaxially arranged sleeves 1, 2, a seal 3 and actuators 17 for moving the second sleeve (Fig. 2) and at the same time for controlling the effective flow area of the openings 12 in the second sleeve and the slurry flow, in which valve the second sleeve is attached removably, for example by means of screws 23 (Fig. 3) directly or via a separate seat 35, at the bottom of the valve housing 4 or at the bottom of the valve housing and the second sleeve is removably fastened, for example by screws 22 to the actuator arm 17 (Fig. 3) and the seal 3 is mounted around the sleeve 1, 2 J1 e.

5

According to Figure 1, the flotation cells 13, 14, 15, 16 are arranged in parallel. The cells may, for example, be of the type disclosed in Finnish Patent Publication No. 42,302. Cells 13 and 14 and 15 and 16, respectively, are connected to each other so as to have a common liquid space and surface height. Inside the cell 14, a valve 17 is placed, which receives messages from the level sensor 1 of the cell 15. Correspondingly, a similar valve is placed inside the cell 16.

15

By placing valves and other devices for adjusting the surface of the cells inside the cells, the cells can be built together. Thus, for example, there is only one partially common partition between the cells 14 and 15. Figure 20 1 shows a solution in which the cells are arranged in a different plane. In practice, the structure can also be implemented as a solution on the same level. 3The level adjustment of the slurry trainer / sludge distributor 4 can be performed in basically the same way as in the cells.

25

The pump wells 1, 2 and 3 of the flotation circuit of Fig. 1 and the manifolds / sludge distributors 12 are provided with an overflow and drain valve 4 as shown in Fig. 2. It is essential in the valve that the hollow stem 5 of the valve is provided with an overflow opening 1a 6 through which in which case the sludge drains out of the process or from the sludge distributor 12 into a pump well 1 in a controlled manner.

Figure 3 shows an embodiment of a housing-operated control valve 1 suitable for use in a flotation circuit unit. VenttiiJin tuJokanava is nuoJen Λ by clicking on the page and the output channel venttiiJipesän the bottom flange of the arrow B sivuJJa. The valve comprises a flow-operated sleeve 1 with a vertically movable flow opening 12 and a fixed adjusting sleeve 2. An annular seal 3 is mounted around the sleeve 1 against the flange. The sleeve 1 is suitably fastened with screws 22 to a flange, which in turn is welded to the hollow arm 16. The sleeves 1, 2 are placed in the valve housing 4.

10

The valve housing 4 and the consumption surfaces of the sleeves 1, 2 are rubberized. The adjusting sleeve is fastened with screws 23 to the bottom flange of the housing 4. The cover 24 of the housing 4 is in turn fastened with screws 23 or correspondingly by a support tube 15, at the end of which rises above the surface of the basin lie-13 a mounting piece 19 of the actuator 17 is mounted. In this mounting piece 19, openings and connections for water or compressed air purge pipe 11e 21. The first of the pipes 20 is connected to the hollow stem 16 of the valve and the second 21 to the valve housing 4.

From the point of view of service and maintenance in the valve of Fig. 3, it is noteworthy that the drain sleeve 1 with its seals 3 can be lifted from the stem 16 through the support pipe from the sludge base. By unscrewing the screws 22, the sleeve 1 and the seal 3 can be replaced.

The adjusting sleeve 2 attached to the bottom flange of the valve housing 4 can be replaced by unscrewing the screws 23. In this case, the valve housing 30 should also be removed from the basin wall on the side of the inlet duct A. This can be done by appropriately closing the inlet channel and removing the mounting of the housing 4 ai 1, which is most preferably a wedge slide mounting.

The valve of Figure 3, in particular for sampling, consists of a valve cross 10 of partially circular cross-section, formed from above on a round-walled body, e.g. a U- or V-shaped body. In its sharp bend is placed the valve shown above (Fig. 2 or 3), the sleeves of which are represented by the ring 11. In the middle of the sleeves there is an outlet from which the sludge stream sample passes to the analyzer. The valve is connected to the slurry piping at a suitable point in the enrichment process. Importantly, in such a valve body, the slurry 10 is subjected to a swirling motion and thus the sample is uniformly supported.

For example, the flow of sludge through the cells can be performed by storing the flow curves based on the characteristic curves 15 of the valves used in the memory of the microprocessor or the corresponding data processing unit. When the position of the valve and the pressure difference across it are measured and communicated, e.g.

The control devices of the processing units can be connected to a suitable common data processing unit, in the memory of which e.g. sludge surface-25 heights important for the process and their permissible ranges.

The supply of chemicals can be performed automatically under the control of a microprocessor, e.g. through the hollow shaft 16 of the valve used in the distributor 11a (Fig. 3) or through a valve for sampling-30 to the process. This can be monitored not only by accurate dosing but also by sampling the slurry with the valve of Figure 4 and in turn analyzing them autoinantically.

It is clear that the device according to the invention is also suitable for other processes for sampling and / or dispensing chemicals into a stream of material, although the invention has been described above in connection with the flotation process of a concentrator.

Claims (5)

7 76502 A method for feeding chemicals to a process and / or taking samples from a process involving valves comprising coaxially arranged sleeves for moving a second sleeve of a seal and an actuator, characterized in that the amounts of material in the treatment units and the flows between them provided said valves, and the supply of chemicals and / or näyΙ ΙΟ-sampling is carried out through the sleeves of the valve interior. 2. Apparatus for feeding chemicals to a process and / or for taking samples from a process comprising a valve with coaxially arranged sleeves 15 (1, 2), a seal (3) and an actuator (17) for moving a second sleeve and the same material in another sleeve. openings (12) for adjusting the effective flow area, characterized in that said device comprises a valve, wherein the supply and / or sampling of chemicals is carried out 20 of the valve sleeves (1, 2) through the interior. Device according to Claim 2, characterized in that the supply of chemicals is arranged via the hollow stem (16) of the valve inside the sleeves (1, 2). 25 Device according to Claim 2 or 3, characterized in that flushing pipes (20, 21) are arranged in the valve. Device according to Claim 2, 3 or 4, characterized in that the valve sleeves (1, 2; 11) are arranged in a valve housing (4; 10) which consists of a chamber with an arcuate wall on one side and whose inlet and outlet channels are: on the side opposite the curved wall 35 of the valve housing.