JPH04362013A - Horizontal cylindrical continuous production equipment for aluminum sulfate - Google Patents

Abstract

PURPOSE:To provide aluminum production equipment with easy quality control, a lot of throughput and simple operation. CONSTITUTION:The equipment is divided into plural reaction chambers 1 to 5 by partition plates 14 each equipped with an upper exhaust gas passage 17 and a lower reaction liquid passage 18. Each reaction chamber after and including the second one is equipped with a stirrer and the last chamber is equipped with a reaction liquid takeoff pipe 15 extending to the bottom of the chamber. The whole equipment is horizontally installed with a little slant in the longitudinal direction to form horizontal cylindrical continuous production equipment for aluminum sulfate.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously producing aluminum sulfate, and more particularly to a cylindrical horizontal continuous production apparatus for aluminum sulfate.

0002

BACKGROUND OF THE INVENTION Conventionally, when producing aluminum sulfate, water is first poured into an independent reaction tank, and while concentrated sulfuric acid is added thereto, aluminum hydroxide in the form of a slurry is simultaneously charged. Shortly after starting to charge the aluminum hydroxide, a reaction occurs with intense boiling reversal. When the charging operation of the specified equivalent amount of raw materials is completed in 50 to 60 minutes, the reaction gradually becomes calm, and after the charging is completed, it is aged for about 2 hours to complete the reaction, and if the produced aluminum sulfate is to be solidified, it is cooled. When solidifying and making a liquid product, the reaction product is diluted with water to make the product. Such a method requires 3 to 4 hours from the start of raw material preparation to the completion of product production. In addition, for mass production, 4 to 5 independent reaction vessels are placed in parallel and operated in batch mode, but in order to stabilize the quality of the product, samples are taken many times during the reaction, and the results of product quality tests are conducted. This necessitates complicated adjustment of reaction conditions, and increases in equipment costs are caused by the increase in the size of the reaction tank. As a continuous production method for aluminum sulfate,
There is a method in No. 7-952, but in this manufacturing method, the reaction for producing aluminum sulfate is carried out under strongly acidic conditions in a state of intense boiling inversion, and the reaction product solidifies when the temperature falls below 90°C. It has not been put into practical use industrially because it causes disadvantages.

0003

[Problems to be Solved by the Invention] An object of the present invention is to eliminate the drawbacks of the conventional aluminum sulfate manufacturing method as described above, and to continuously produce products of uniform quality with easy operation. The aim is to enable mass production.

0004

[Means and effects for solving the problem] According to the present invention,
The above problem consists of a plurality of reaction chambers each partitioned by a partition plate with an upper exhaust gas passage and a lower reaction liquid passage, and each reaction chamber after the second is equipped with a stirrer, and the final reaction The chamber is equipped with a reaction liquid extraction pipe that extends to the bottom of the reaction chamber, and the solution is achieved by a cylindrical horizontally installed continuous manufacturing device for aluminum sulfate, which is characterized by being tilted in the length direction and installed horizontally. be done. The cylindrical horizontal continuous production apparatus of the present invention is tilted in the longitudinal direction, so that the raw materials supplied to the first reaction chamber pass through the second and third reaction chambers while reacting, and are naturally transferred to the last reaction chamber. It is designed to flow down. The gradient of this slope is 1/100 to 5/100, and 1/10
If it is less than 0, the residual liquid of the reaction product will not collect in the last reaction chamber when cleaning the reaction chamber after the work is completed, and the product will solidify at the bottom of each reaction chamber.If it is more than 5/100, the reaction If the inclination of the chamber is too large, the effective volume of the reaction chamber will be extremely reduced, resulting in poor production efficiency.

In the apparatus of the present invention, the first reaction chamber is provided with a concentrated sulfuric acid inlet, a diluted sulfuric acid inlet, and an aluminum hydroxide slurry inlet, and two types of raw materials, sulfuric acid and aluminum hydroxide slurry, are fed into the first reaction chamber. Preparation can be started and finished at the same time. Therefore, compared to the conventional method in which three types of raw materials, water, sulfuric acid, and aluminum hydroxide slurry, are used at different starting and finishing times, the operation is simpler and the quality of the products can be extremely controlled. It can be done easily and accurately. In addition, in the apparatus of the present invention, the reaction proceeds sequentially at the same time as the raw materials are charged, and the reaction products move from the first reaction chamber to the second, third, etc. reaction chambers, resulting in an explosive and violent reaction state. does not occur, and the reaction takes place in an extremely stable state. The charging flow rate of each raw material is kept constant from the start of charging to the end of charging, and the raw materials are continuously charged according to the desired production amount, and most of the reaction proceeds in the first reaction chamber, but the reaction mixture is transferred to the second, The aluminum sulfate production reaction is completed while moving sequentially to the third reaction chamber, and the reaction product is completely ripened in the last reaction chamber. The time from the start of charging the raw materials to the end of the reaction varies depending on the dimensions of the apparatus, but is about 80 to 120 minutes. The cylindrical horizontal reactor of the present invention has a production capacity five times or more as compared to a conventional batch-type vertical reactor, and is suitable for mass production. In addition, by adjusting the concentration of aluminum hydroxide slurry, aluminum oxide (
The Al2O3) content can be varied from 14% to 16%. Note that the inner walls of the reaction chambers of the apparatus according to the present invention can be constructed by dividing each reaction chamber and constructing the inner walls using Teflon lining, Teflon coating, glass lining, etc., thereby significantly reducing equipment costs. Can be done.

A cylindrical horizontal continuous production apparatus for aluminum sulfate according to the present invention will be explained below with reference to the drawings. FIG. 1 is a plan view of an apparatus according to the present invention, in which a first reaction chamber 1 having a concentrated sulfuric acid inlet 6, a dilute sulfuric acid inlet 7, and an aluminum hydroxide slurry inlet 8 is provided with hydroxide at a predetermined aluminum hydroxide concentration. When aluminum slurry, concentrated sulfuric acid and diluted sulfuric acid are introduced, the first
The temperature inside the reaction chamber is approximately 120° C., and the reaction proceeds in a stable boiling state. Referring to FIG. 2, which is a cross-sectional view taken along line A-A' in FIG. It enters the second reaction chamber 2 through 18 and reaches the fifth reaction chamber 5 through the third and fourth reaction chambers while the reaction is maturing. The amount of reaction solution charged is approximately 80% of the total volume of the reaction chamber.
Met. Approximately 80 minutes after the start of raw material preparation, when the reaction aging of aluminum sulfate is completed in the reaction chamber, the reaction product is taken out from the fifth reaction chamber via the takeout pipe 15 by the stock solution pump P and diluted to the desired concentration by the diluter 16. and make it into a product. FIG. 3 is a sectional view taken along line BB' in FIG. 2.

Since the cylindrical apparatus of the present invention is left tilted with respect to the horizontal plane, the raw materials charged in the first reaction chamber gradually move toward the fifth reaction chamber while undergoing reaction maturation, and after the work is completed, the raw materials are reacted. In cleaning the chamber, the produced aluminum sulfate is prevented from solidifying within the reaction chamber. In addition, since each reaction chamber is separated by a partition plate, the reaction product is stirred by the stirrer 19 while staying in each reaction chamber, and is moved to the next reaction chamber while reacting sufficiently and proceeding with ripening. go. The steam generated in each reaction chamber passes through the gas passage 17 at the top of the partition plate and is discharged into the atmosphere from the gas exhaust port 10 of the first reaction chamber. Note that since the distal end of the take-out pipe 15 is open near the bottom of the fifth reaction chamber, when the reaction product is not taken out, the reaction product does not remain in the pipe and solidify to block the pipe.

[0008]

Effects of the Invention: According to the continuous production apparatus of the present invention, an increase in production volume of more than 5 times compared to that of a conventional independent vertical batch type production apparatus can be achieved, and the production volume and concentration of reaction products can be adjusted. can be easily carried out, the equipment is compact, and the installation area is small, so equipment costs and personnel costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a cylindrical horizontal continuous manufacturing apparatus for aluminum sulfate according to the present invention;

[Fig. 2] A cross-sectional view taken along line A-A in Fig. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

[Symbols in the figure] 1, 2, 3, 4, 5...1st to 5th reaction chambers 6...Concentrated sulfuric acid charging port 7...Dilute sulfuric acid charging port 8...Aluminum hydroxide slurry charging port 9, 12...
... Manhole and viewing window 10 ... Gas exhaust port 11 ... Temperature sensor installation port 13 ... Stirrer installation port 14 ... Partition plate 15 ... Take-out pipe 16 ... Dilution device 17 ... Gas passage 18 ... Reaction liquid passage 19... Stirrer.

Claims (3)

[Claims] Claim 1: Consisting of a plurality of reaction chambers each partitioned by a partition plate having an upper exhaust gas passage and a lower reaction liquid passage, each of the second and subsequent reaction chambers is provided with a stirrer, and the last A cylindrical horizontally installed continuous production apparatus for aluminum sulfate, characterized in that the reaction chamber is provided with a reaction liquid take-out pipe extending to the bottom of the reaction chamber, and the entire apparatus is installed horizontally with an incline in the length direction. Claim 2: The gradient of the slope is 1/100 to 5/100.
2. The device according to claim 1. 3. The apparatus according to claim 1, wherein the first reaction chamber is provided with a concentrated sulfuric acid inlet, a diluted sulfuric acid inlet, and an aluminum hydroxide slurry inlet.