FI98708B - Homogenising 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.

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There are few burial deposits. One example is the Estonian Saa-; * 'j renmaa. There, the limestone is quarried to obtain limestone «·» / 25 boulders which are cleaned, e.g. the clay is separated from the burning limestone. Combustion takes place in miles, typically in the form of batches of approx. 60 t, at least in a partially closed state. After firing, the stone is about half of the above amount. The burner * used is, for example, wood approx. 80 mV burning time. In combustion, the temperature of 30 miles is raised to about 1300 ° C and burned for about 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 burial ground and allowed to stand for several months up to a year before bagging, depending on the quality. The Mg content of bautacalk is less than 3%. The proportion of slaked lime is about 70%, the rest is other calcium, magnesium, etc. compounds.

98708 2

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 set forth 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.

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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 slate lime. * SI, Fig. 2 shows top view of Fig. 1, Fig. 3 shows a side view of the screw pump.

. *: *. 30 »i · *, / v *. Figure 1 shows a mixing apparatus for mixing slime lime. The mixing apparatus comprises a mixing tank 1, inside which a stirrer 3 rotatable about its axis 2 is placed. The agitator shaft is driven by an actuator 7 placed on top of the tank.

98708 3 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 forms a spiral 12 rotating about its axis in the cylindrical part of the container. 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. With the pallets 14, the material to be mixed is detached from the inner surface of the cone, such as spi->. in the cylindrical part.

i; Tombstone material is fed from the top of the tank 1 to the grate 17 «·; through. The sacks can be emptied, for example, by using a grille

• A mandrel means 18 placed on a reel with rollers 18A and 18B

: 1 sack can be made to run and emptied. The desired amount of water is mixed so that the water content is about 50-60%.

·· * .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 is pumped back into the tank 1 via the connection 5. When, for example, the pump power consumption or »mixer power consumption is measured / can be estimated when ..: 35 product the viscosity 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 as 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 Example 6, a volume of 5 m3 # is emptied into the tank while stirring and water is added. A predetermined amount # is recirculated by pump until it is detected from the power take-off that the ingredients are mixed, the finished slurry 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.

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The mixed tombstone is made to flow along the connection 5 and «vt ·; it flows into the tank 1 at a water content of about 60%, behaving • i · 25 with a viscosity mainly diatomaceous. There are no additives required in the invention. The use of these can only be assessed according to the use of tombstone, for example in mortar or paint applications and usually in further use.

The invention can be modified by the scope defined by the appended claims. The invention cannot be limited to one of the application examples shown, but many modifications are possible.

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Claims (7)

98708 A method for mixing lime, preferably tailings, which has become inhomogeneous during storage, in which method the solid slurry is mixed with liquid in a tank by means of a mixer (3), the tank (1) being cylindrical at the top (10) and conical at the bottom (11) , there is an opening in the bottom (23) of the tank for feeding sludge to the pump (4), the sludge is circulated through the connection (5) from the pump (4) to the tank top (10) to make a closed circuit, after homogenization the connection (5) is broken and the sludge ) for further use, characterized in that the homogenized tailings lined for further use are mixed with other substance (s) to form the final product, e.g. mortar or paint. ' Method according to Claim 1, characterized in that the sludge is recycled by means of a screw pump (4). Method according to Claim 1, characterized in that the mixing power consumption is monitored in order to determine the degree of mixing of the slurry. A mixer for mixing a solid and a liquid in the method according to claim 1, with its upper part (10) in a cylindrical shape and its lower part (11) in a conical container. in (1), the agitator shaft (2) is supported at the top and bottom *. (21, 22), the agitator is formed by a spiral (12) revolving about its axis in the cylindrical part (10) of the tank, * 30 the spiral (12) is supported on the shaft (2) at a distance from each other: ). the agitator of the truncated cone of the container is extended; with movable pallets (14), characterized in that the pallets (13) are arranged horizontally but their plane 35 is turned at an angle of about 45 degrees to the horizontal with respect to its longitudinal axis. 98708 Agitator according to Claim 4, characterized in that the vanes (13) are fastened at one end to the agitator shaft (2) and at the other end to a spiral (12) which rotates in the vicinity of the inner surface of the cylindrical container at substantially the same distance from the agitator shaft. . Agitator according to one or more of the preceding claims, characterized in that the spaced apart blades (16) are arranged at a distance from one another between the agitator shaft (2) and the blade (14). Mixer according to Claim 6, characterized in that the blades (16) are substantially horizontal, but they are turned at an angle of approximately 45 degrees with respect to their longitudinal axes. 98708