FI98708C - Homogenization method and plant - Google Patents

Description

98708

HOMOGENIZATION METHOD AND APPARATUS

The invention relates to a method and an apparatus for homogenizing a solid and a liquid, in particular tailings.

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Changed climatic conditions place very high and precise quality requirements on the materials used in facade construction and their manufacture. The right substances and mixtures must be found for each use.

Plaster mortars are manufactured as wet mortars or dry products to be mixed at ready-mixed concrete stations, in which case the dry matter is delivered bagged to the construction site, where the dry matter is mixed with water. Generally, these products are made using building fine lime powder, selected aggregates, water and, if necessary, additives. Renovation construction has increased. Mortars are required to have good resistance to weathering. When the weather resistance of building fine lime has been found to contain trees-20 roads, efforts have been made to find alternatives. We have ended up using grave lime.

There are few burial deposits. One example is the Estonian Saa-; ·; renmaa. There, the limestone is quarried to obtain limestone boulders which are cleaned, e.g. the clay is separated from the burning limestone. Combustion takes place in miles, depending on the type of batch, for example in the form of batches of approx. 60 h, at least in a partially enclosed space. After firing, the stone is about half of the above amount. The fuel used is, for example, wood approx. 80 mV burning time. In incineration · «·« The temperature of 30 miles is raised to approx. 1300 ° C and incinerated for approx. 80 h.

*. After firing, the limestone is allowed to cool for a couple of days, the limestone is removed from the mile. The burnt limestone is extinguished with water. The resulting lime paste / putty is screened in a grave and allowed to stand for several months up to a year before bagging, depending on the quality. The Mg content of limestone is less than 3%. The proportion of slaked lime is about 70%, the rest is other calcium, magnesium, etc. compounds.

2 98708

There have been problems in making head lime homogeneous after storage. Tomb lime that has been in sacks for a long time is usually not mixed by hand or at least directly in the mortar making process, as some of the contents of the sack may have dried out. Thus, the contents 5 of the sack are often inhomogeneous and often part of it so hard that it cannot be easily homogenized and thus not dispensed for making a mortar or any other product made therefrom. The method can also be used to mix other materials of a similar type, although it has been developed for mixing head lime.

By means of the method and device according to the invention, a decisive improvement is obtained in the above-mentioned drawbacks. To achieve this, the method and the device according to the invention are characterized by what is stated in the characterizing part of the claims.

The advantages of the invention are that the mucilage is caused to mix into a homogeneous product. It can be used in further processing. The final product is also homogeneous. Homogenization can be performed mechanically.

The invention will be described in more detail below with reference to the accompanying drawing, in which ·; 25 ···· Fig. 1 shows a mixing device for homogenizing tailings, • ·· • · · ·. · * Sr, Fig. 2 shows a top view of Fig. 1,: Fig. 3 shows a side view of a screw pump.

.: · · * 30 '. Figure 1 shows a mixing apparatus for mixing mucilage. The mixing apparatus comprises a mixing tank 1, inside which is placed a stirrer 3 rotatable about its axis 2. At the bottom of the tank there is a connection to a screw pump 4 which can circulate the paste back to the tank 1 via a pipe 5 or direct it . The agitator shaft is driven by an actuator 7 placed on top of the tank.

3 98708 The container 1 is cylindrical in its upper part 10, the lower part of which is connected to the upper part of the conical lower part 11. The bottom 23 of the truncated cone has a sludge outlet provided with a valve 19. The agitator shaft is supported at its upper and lower parts 21, 22.

5 The agitator is formed by a spiral 12 rotating about its axis in the cylindrical part of the tank. The spiral is supported on the shaft by spaced apart bars 13 which are placed horizontally but their plane is turned at an angle of about 45 degrees to the horizontal with respect to its longitudinal axis.

The laths are attached at one end to the agitator shaft and at the other end to a spiral which rotates in the vicinity of the inner surface of the cylindrical container at substantially the same distance from the agitator shaft throughout. The agitator is extended in a truncated cone by moving blades 14 near its inner jacket at the apex of the cone at a horizontal angle 15, supported spaced apart by the agitator plates 16 of the agitator shaft 2. They are substantially horizontal but rotated 45 degrees about their longitudinal axes. The pallets 14 cause the material to be mixed to be detached from the inner surface of the cone, such as a spi;

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The lime material is fed from the top of the tank 1 through the grate 17 • ··. The sacks can be emptied, for example, by using a mangle means 18 placed next to the grate, between which the sack can be made to pass and empty between the rollers 18A and 18B. The desired amount of water is mixed so that the water content is about 50-60%.

··· ♦ ·· »», 1: \ 30 The material mixed in the tank is fed as shown in Figure 3. to a screw pump 24 with a feed screw 25 which presses the material into the screw pump part 26, from which the substance * 1 is pumped back into the tank 1 via a connection 5. When e.g. the power consumption of the pump or the power consumption of the mixer is measured, The viscosity of the 35 products is most suitable for making mortar, etc. and especially when even the last lumps have been made to mix. The already homogenized product is thus introduced into the mortar.

4 98708

Generally, the method involves mixing in a batch type. The bagged article is usually a pasty substance, but has settled and partially hardened during transport due to drying. A certain number of sacks, such as in the example about 6 5 m3, are emptied into the tank while stirring and adding a predetermined amount of water, the sludge is pumped until it is detected from the power take-off that the ingredients are mixed, the finished sludge is fed to the mortar.

10 The putty-like substance in the bag may contain about 20-30% water.

Part of the contents of the sack is the so-called. the limestone and part may be, for example, a hardened material and part a putty-like material. During mixing, the shear-15 forces are applied to the contents of the bag emptied into the tank by means of a mixer and also by recirculation with a screw pump and water is added so that the water content rises to 50-60% as required. Such a homogenized slurry is led to further processing, where it is easier to reach the final product when the substance to be mixed is already in homogenized form, i.e. the mixing of homo-20 generated substances is much better than the mixing of inhomogeneous substances.

The mixed tailings are made to flow along the connection 5 and flow in a tank 1 at a water content of about 60%, behaving in a viscous manner. No additives are required in the invention. The use of these can only be assessed according to the use of • ·· V * burial lime, eg in mortar or paint applications and usually in further use.

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The invention may be modified as defined in the appended claims. protected area. The invention cannot be limited to one embodiment shown, but many modifications are possible.

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Claims (7)

A method of mixing lime, advantageous for mixing lime slurry suspension, which substance has become, during storage, homogeneous, in which method the suspension of the solid is mixed with liquid in a container by means of a mixer (3), which container (1) is cylindrical in its upper part (10) and its lower part (11) conical, in the bottom of the container (23) there is an opening for feeding the suspension 10 to the pump (4), the suspension is circulated via a connection (5) in the pump (4) to the upper part (10) of the container to provide a closed circulation of the chromium, after the homogenisation the connection (5) is broken and the suspension is passed along the connection (6) for further treatment, characterized in that it continues to be processed. jointed homogenized burial limestone is mixed with the other substance (s) to produce a final product e.g. mortar or paint. '20 Method according to claim 1, characterized in that the suspension is circulated with a screw pump (4). Method according to claim 1f, characterized in that the power output of the mixture is monitored to define; : The degree of mixing of the suspension. A mixer for mixing a solid and liquid in a method according to claim 1 in a container (1) whose upper part .. (10) is cylindrical and lower part (11) conical, the shaft of the mixer > [* 30 (2) is supported from its upper and lower parts (21, 22), the mixer • V 'is formed by a spiral (12) rotating about its axis in the cylindrical portion (10) of the container, the spiral ( 12) is supported in • ·. ***. the shaft (2) with plates (13) spaced apart from each other, in connection with the coil of the mixer (12) the mixer has been extended along with moving blades (14) close to the inner flange of the cutter's cut cone, characterized in that the plates (13) are positioned horizontally, but their pitch is pivoted to their longitudinal axis at about a 45 degree angle relative to the horizontal direction. A mixer according to claim 4, characterized in that the plates (13) are fixed from one end to the shaft (2) of the mixer and their other end to the coil (12), which rotates in close proximity to the inner surface of the cylindrical container. the same distance from the shaft of the container all the way. 10 6. A mixer according to one or more of the preceding claims, characterized in that in the tip of the cone in relation to the shaft (2), the blades (16) are spaced apart from each other between the shaft (2) and the blade. (14). 7. A mixer according to claim 6, characterized in that the blades (16) are substantially straight, but they are pivoted at an angle of about 45 degrees relative to their longitudinal axis. I I »• · · · • ·· • · · · · • · •« I. · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·