SU719652A1 - Apparatus for crystallizing aluminate solutions - Google Patents

Description

(54) APPARATUS FOR CRYSTALLIZING ALUMIN: MANY

SOLUTIONS - :: -;:.

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The invention relates to equipment for chemical and hydrometallurgical production, in particular to apparatus for crystallization solutions, and can be used in those industries where 1b technological processes have solid extraction of solids from solutions by crystallization.

A known apparatus for the crystallization of aluminate solutions, comprising a body with a lid, a vacuum evaporator, connected to the body by a barometric tube, a device for mixing and transporting the suspension in a vacuum evaporator, th {the Gullet pump and nozzles for supplying and outputting pacTBOpaf / J,

Temperature control in the apparatus is ensured by a predetermined pressure in the vacuum evaporator, where the boiling solution is cooled to a temperature equilibrium in pressure. As a result of the instantaneous rate of cooling of the solution, the inertia of the cooling system during temperature control is significantly reduced.

However, the need to install a vayuum yaritel At a barometric altitude above the grain of the solution, the vapurate degrades the layout of the equipment and requires additional costs to increase the high heights of production. Mixing the suspension with a circulating pump impairs the quality of the crystals by ensuring the compactness of the design, as well as improving the quality of the obtained crystals.

° The purpose of the invention is to reduce capital and operating costs.

This goal is achieved by the fact that, in the apparatus, the device for mixing and transport is designed as an airlift of transport pipes, the transport pipe being installed in a barometric pipe, the upper end of which is connected to a vacuum evaporator at the boundary between the housing cover and the nozzle for solution withdrawal, and the barometric pipe pipe installed in

Claims (2)

0 airlift pipe, the lower end of which is made conical and tightly connected to the transport pipe. Yg, .ijilss i .Ai flftVr s & Ci The drawing shows the apparatus for cris “- - -. гgl {Gs-tsii alu-m ya p-atteepoB; PROT; SQUARE EQUIPMENT CONTAINS FROM corpus 1 (roofs: f6TVyoro has a vacuum evaporator 2 installed, pipes 3 for transporting IpS TBlS aftS of a conical 4 ftft device to vacuum evaporator 2, barometric pipe 4, concentrate - ---- of the installed pplShbnike to the transport pipe 3 and the airlift pipe 5 1 SHEDSCH; to them. In the lower part of the airlift air is fed through the pipe 6. In the upper As part of the housing 1, at the level of the upper section of the air-lift pipe, there are nozzles for supplying 7 and removing the solution 8. Vacuum evaporator 2 is connected by pipe 9 with vacuum;;: system ...;; 73 1GSP7 The device works in the next way. The original aluminate solution through the nozzle 7 is fed into the housing of the apparatus I / VovZHGShG in T1yr1 l y: and bryn-Shr Shyo ayvaK) - he is in a unit of the facility he pstep orftyOcaetCliv to the atinapaTa part, from where it goes upwards through the transport tube 3 to the vacuum evaporator 2. Here, as a result of self-dissolution of the solution due to vacuum, an instantaneous decrease in its temperature occurs. Obyyush, iyert | d §fShpIp on tru. line 9 Ш1В | 1йГГЖап1а (GatG akuu system. Cool; eaten solution through barometric pipe 4 The nozzle 8 is removed from the apparatus. oby uydhe between Two together Sh1Sy Shg vyo 1, ° piarefyora level in which in stationary mode ™ 6 Iyiakov7 - lf, f .... ..... - .-- l. 1. -h h5.- ,. Air supply to the airlift pipe 5, due to the formation of 1 a50 slider mixture with a specific weight different from the specific gravity of the true axis, the fluid level in the barometric pipe h drops below the level of the solution in apparatus N. at 3701 the ratio between these the values are determined by the formula h (-) H, In the operating mode, when Y; avliv in vTc ttaplT ff:% nShaet-da Shannog , The ratio between the value of E and H h. It is expressed in accordance with the Bernoulli equation as follows, + (l-) H-fVsLr | Z. where PJ, Pg and PC are the barometric pressure, the absolute pressure in the vacuum cleaner and the pressure loss along the pipeline length and local resistance, correspond to the WrjsW ' -speed, the gas-liquid mixture in the arlyph and the true fluid in the barometric; .,. 1 which pipe, UGG - the specific gravity of the liquid, - g - Acceleration The liquid level in the barometric pipe h is most dependent on the significant gas content in the air-lift pipe. With a height of an air-lift pipe of 30 m and gas content, the 7-part of the liquid in the barometric pipe does not exceed the liquid level in the apparatus, i.e. h H, even when the absolute pressure in the vacuum evaporator is 10 kgf / m. Thus, by changing the value of Bakyum in the Vacuum-Evaporator, it is possible to quickly change the temperature conditions in the apparatus within the range of the apparatus for a given productivity of the airlift, i.e., at a constant value of gas content. The use of decomposers with a self-evaporator of the proposed design allows a significant reduction in capital costs. Hia Construction of industrial premises. The invention The apparatus for the crystallization of aluminate solutions, including a casing with a lid, a vacuum evaporator connected to the cord by a barometric tube, a device for mixing and transporting the suspension and a vacuum evaporator, a circulation pump and nozzles for supplying and discharging the solution, by donning / dcm the fact that, in order to reduce capital and operating costs, the device for transporting and transporting is made in the form of air-lift and transport pipes, with the transport pipe installed in barometric The upper tube, the upper end of which is connected to a vacuum evaporator at the boundary between the body cap and the nozzle for withdrawal of the solution, and the barometric tube is installed in the air-lift pipe, the lower end of which is connected to the transport tube. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 178355, cl. In the FG D 9/02, 07.30.64 (prototype). To vacuum pump UH solution. - ;. ...