RU136796U1 - CHEMICAL DISPERSION POWDER PRODUCTION PLANT - Google Patents

Abstract

A plant for the production of powders by chemical dispersion, including a container for the preparation and storage of an alkali solution, a reactor inside which there is a mixing device, a device for removing the hydrogen-containing gas mixture and chemical dispersion products, a filter, a drying oven, characterized in that the installation is equipped with a crusher of feedstock, controlled by auger batcher-loader, centrifuge, automatic control unit connected to actuators by control channels, the reactor is equipped with a pH meter and a level sensor of the mother liquor and has an inlet for loading microparticles of the feedstock, an inlet for supplying an aqueous alkali solution, an inlet for returning the filtered mother liquor, while the outlet for draining the mother liquor is equipped with a mesh filter, and the filter installed after the reactor is a cyclone-type sump equipped with a high pressure pump and connected to the reactor by a non-reactivity discharge pipe vshego mother liquor.

Description

The technical field to which the utility model relates is the chemical industry. The scope of a useful model is the production of powders by chemical dispersion.

The level of technology. Known installation (US No. 2958582, C01F 7/00, C01F 7/42, publ. 01.10.1958, US No. 2958583, C01F 7/00, C01F 7/42, publ. 01.10.1958) for the production of aluminum and hydrogen hydroxides, containing a heat exchanger, a separator and a filter for separating the resulting suspension of aluminum hydroxides with water. In this case, it is necessary to use additional substances that facilitate the interaction of reagents, for example, catalytic amounts of organic amines. The introduction of these substances makes it impossible to obtain pure aluminum hydroxide.

Known (US No. 2758011, B01J 21/00, B01J 21/04, publ. 07.08.1956) a plant that implements a method for producing alumina in the form of boehmite consists of a reactor with a stirrer, an opening for introducing water and powdered aluminum, a sump, a condenser for receiving steam gas. The disadvantage of this installation is the impossibility of its automation and the frequency of operation.

A known installation (patent RU 2223221, publ. 10.02.2004), including a mixer, reactor, slurry tank, condenser, the reactor is a high-pressure apparatus equipped with a nozzle for spraying a suspension of powdered aluminum in water up to diameter of drops no more than 100 microns.

The main disadvantage of this installation is the difficulty of maintaining the size of the diameter of the droplets, which leads to a decrease in the purity and uniformity of the resulting powder.

Known (patent RU 2350563, published March 27, 2009) is an apparatus for producing aluminum hydroxide and hydrogen, which includes a platform scale, a solvent reactor, a reactor equipped with a pressure sensor, a temperature sensor for the solution in the reactor, a sensor for the presence of metal in the solution, and a mixing device, a condenser, a drying column, a clarifier clarifier, a filter (or centrifuge), an electric oven (dryer), a ball mill, a heat exchanger. This installation is taken as a prototype.

The disadvantage of the installation is the low productivity of the installation and the need to use mainly expensive powders of ultrafine aluminum and activated aluminum alloys.

Disclosure of a utility model. The essence of the utility model is expressed in that it contains a container for preparing and storing an alkali solution, a crusher of feedstock, a controlled screw metering loader, a device for removing the hydrogen-containing gas mixture and chemical dispersion products, a reactor containing a mixing device (mechanical activator) inside, driven in motion by an electric motor equipped with a pH meter and a level sensor of the mother liquor, which has an inlet for loading microparticles of the feedstock, an inlet solution for supplying an aqueous solution of alkali, an inlet for returning the filtered mother liquor, as well as an outlet for discharging the mother liquor, equipped with a strainer, a filter installed after the reactor and which is a cyclone type sump, also equipped with a high pressure pump and a pipe connected to the reactor discharge of unreacted mother liquor, centrifuge, drying oven, automatic control unit connected to actuators by control channel am.

The technical result is expressed in increasing the manufacturability of the installation and ensuring high efficiency at all stages of the installation.

A brief description of the drawings. The figure 1 shows a diagram of the proposed device. The experimental setup of the installation is presented in figure 2.

The device (figure 1) includes:

1 - crusher feedstock;

2 - controlled screw feeder loader;

3 - reactor for the chemical interaction of an aqueous solution of alkali and microparticles of the feedstock;

4 - mechanical activator;

5 - mesh filter;

6 - electric motor;

9 - capacity for the preparation and storage of an aqueous alkaline solution of water and alkali;

10, 11, 13, 15, 17, 18, 21, 23 - pipelines;

12 - high pressure pump;

14 - filter sump cyclone type;

16 - centrifuge;

19 - drying oven;

22 - a hydrogen absorber;

25 - automatic control unit;

26 - control channels;

27 - level sensor of the mother liquor;

28, 29, 30 - inlet;

31, 32 - outlet;

33 - pH meter.

Implementation of a utility model. The design of the device in a static state contains (FIG. 1) a feedstock crusher 1, a controllable screw feeder-loader 2, a reactor 3 for chemical interaction of an aqueous alkali solution and microparticles of the feedstock, containing a pH meter 33, equipped with a mother liquor level sensor 27 and located inside it, a mechanical activator 4, driven by an electric motor 6, having an inlet 28 for loading microparticles of the feedstock, an inlet 29 for supplying an aqueous alkali solution, an inlet 30 for returning the filtered mother liquor, and two outlet openings: an outlet 31 for discharging the resulting hydrogen reaction, an outlet 32 for discharging the mother liquor equipped with a strainer 5; a container 9 for preparing and storing an aqueous alkaline solution from water 7 and alkali 8. A filter settler 14 of a cyclone type with a high pressure pump 12; centrifuge 16; a drying oven 19; hydrogen absorber 22; an automatic control unit 25 connected to actuators via control channels 26.

The installation works as follows: the feedstock of aluminum or aluminum alloy is crushed in the crusher 1 of the feedstock and is fed through the inlet 28 into the cavity of the reactor 3 using a controlled screw feeder 2, at the same time, an alkali aqueous solution is poured from the tank through the inlet 29 9for the preparation and storage of an aqueous alkaline solution of water and alkali. A mixture of particles of the starting material and an aqueous solution of alkali is mixed by a mechanical activator 4, driven by an electric motor 6, which ensures a constant movement of the dissolved particles of the feedstock inside the reactor 3. The hydrogen released as a result of the reaction is discharged through the outlet 31 through a pipe 23 to a hydrogen absorber 22 and utilized . The high pressure pump 12 continuously pumps through the outlet 32 from the reactor 3 the reacted components in the form of a mother liquor and feeds them into the filter cyclone-type settler 14, in which the mother liquor is separated with boehmite particles of the required size. The components of the mother liquor that have not passed through the filter sump 14 of the cyclone type are returned through the pipe 15 through the inlet 30 to the reactor 3 and are subjected to a repeated dispersion process. The moist boehmite powder 24 separated in the filter of the cyclone-type settler 14 is loaded into a separator (centrifuge) 16. The aqueous alkali solution separated from the powder is returned via line 17 to the tank 9 for preparation and storage of the aqueous alkaline solution from water and alkali, and the gel-like powder is extruded through the pipeline 18 in the drying oven 19, from which the dry powder of boehmite 20. The vapors of the aqueous alkali solution from the drying oven 19 are sent through a pipeline to a separator 16 (centrifuge). The dry powder of boehmite 20 is collected and packaged. Coordination of the operation of all elements of the installation is carried out by the control unit 25 along the control channels 26. According to the data received from the pH meter 33, a signal is issued for pouring an aqueous solution of alkali, according to the signal from the sensor 27 of the mother liquor level in reactor 3, a command for loading microparticles of the feedstock and starting crusher 1 feedstock, information about the fullness of the filter of the settler 14 of the cyclone type causes a command to load and start the centrifuge 16.

The developed instrumentation and technological scheme for the production of powders by the dispersion method can be easily mounted on the basis of existing electrochemical plants.

Thus, the proposed utility model allows to ensure the continuity of the powder production process, increasing the purity of the product by creating a reverse current loop for unreacted raw materials and providing multi-stage filtration and separation of unreacted raw materials.

Claims (1)

A plant for the production of powders by chemical dispersion, including a container for the preparation and storage of an alkali solution, a reactor inside which there is a mixing device, a device for removing the hydrogen-containing gas mixture and chemical dispersion products, a filter, a drying oven, characterized in that the installation is equipped with a crusher of feedstock, controlled by auger batcher-loader, centrifuge, automatic control unit connected to actuators by control channels, the reactor is equipped with a pH meter and a level sensor of the mother liquor and has an inlet for loading microparticles of the feedstock, an inlet for supplying an aqueous alkali solution, an inlet for returning the filtered mother liquor, while the outlet for draining the mother liquor is equipped with a mesh filter, and the filter installed after the reactor is a cyclone-type sump equipped with a high pressure pump and connected to the reactor by a non-reactivity discharge pipe vshego mother liquor.

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