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Device and method for continuously producing aluminum sulfate octahydrate

A technology of octadecahydrate and aluminum sulfate, applied in chemical instruments and methods, chemical/physical process, chemical/physical/physical chemical process, etc., can solve the problem of narrow metastable zone of octadecahydrate aluminum sulfate crystallization and improper crystallization operation conditions. , high temperature control requirements, to achieve the effect of easy control of particle size, short residence time and few operating parameters

Pending Publication Date: 2021-02-23
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there is a process for continuous production of aluminum sulfate octadecahydrate, the process is completed by continuous reaction and continuous crystallization. The crystallization metastable zone of aluminum sulfate octadecahydrate is narrow, and the requirements for temperature control are high. Improper crystallization operating conditions will cause Explosive crystallization, causing blockage of devices and pipelines

Method used

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  • Device and method for continuously producing aluminum sulfate octahydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The waste sulfuric acid with a mass fraction concentration of 55% in the waste sulfuric acid tank 1 enters the head tank 3 through the sulfuric acid delivery pump 2, and the material in the head tank 3 is added to the first raw material mixing kettle 4, and the aluminum hydroxide with a mass fraction of 99.8% The powder is fed into the first raw material mixing tank 4 through the solid feeding pocket 5 and mixed with waste sulfuric acid to form a raw material slurry. The molar feeding ratio of aluminum hydroxide and sulfuric acid is 1:1.51, and the operating temperature of the first raw material mixing tank 4 is 35°C. The feeding time is 2 hours, and the stirring time is 2 hours. Three reaction kettles 7 are used in series for normal pressure reaction, and the reaction kettle 7 is fed with steam for reaction: the temperature of the first reaction kettle is 95°C, and the residence time is 60min (the conversion rate of the product is 72% ), the temperature of the intermedi...

Embodiment 2

[0035]The waste sulfuric acid with a mass fraction concentration of 55% in the waste sulfuric acid tank 1 enters the head tank 3 through the sulfuric acid delivery pump 2, and the material in the head tank 3 is added to the first raw material mixing kettle 4, and the aluminum hydroxide with a mass fraction of 99.8% The powder is fed into the first raw material mixing tank 4 through the solid feeding pocket 5 and mixed with waste sulfuric acid to form a raw material slurry. The molar feeding ratio of aluminum hydroxide and sulfuric acid is 1:1.51, and the operating temperature of the first raw material mixing tank 4 is 35°C. The feeding time is 2 hours, and the stirring time is 2 hours. Three reactors 7 are connected in series for adiabatic pressurized reaction, and the reactor 7 is fed with steam for reaction: the temperature of the first reactor is 120°C, the pressure is 0.2Mpa, and the residence time is 30min (product conversion rate 76%), the temperature of the intermediate ...

Embodiment 3

[0037] The waste sulfuric acid with a mass fraction concentration of 46% in the waste sulfuric acid tank 1 enters the head tank 3 through the sulfuric acid delivery pump 2, and the material in the head tank 3 is added to the first raw material mixing kettle 4, and the aluminum hydroxide with a mass fraction of 99.8% The powder is added to the first raw material mixing tank 4 through the solid feeding pocket 5 and mixed with waste sulfuric acid to form a raw material slurry. The molar feeding ratio of aluminum hydroxide and sulfuric acid is 1:1.49, and the operating temperature of the first raw material mixing tank 4 is 35°C. The feeding time is 1 hour, and the stirring time is 1 hour. Two reaction kettles 7 are connected in series to carry out normal pressure microwave reaction, and the reaction kettle 7 is fed with steam for reaction: the microwave power of the first reaction kettle is 200W / m 3 , the temperature is 105°C, the residence time is 30min (the product conversion rat...

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Abstract

The invention discloses a device and a method for continuously producing aluminum sulfate octahydrate, and belongs to the technical field of comprehensive utilization of waste sulfuric acid. The device comprises a waste sulfuric acid tank, a sulfuric acid conveying pump, an elevated tank, a first raw material mixing kettle, a solid feeding bag, a raw material pump, a plurality of reaction kettles,a reaction kettle heat exchanger, a steel belt granulator, a product tank, a feed liquid pump and a second raw material mixing kettle, waste sulfuric acid in the waste sulfuric acid tank enters the elevated tank through the sulfuric acid conveying pump, and sulfuric acid in the elevated tank and aluminum hydroxide in the solid feeding bag are respectively added into the first raw material mixingkettle or the second raw material mixing kettle regularly and quantitatively to be mixed into raw material slurry; the raw material slurry sequentially enters a plurality of reaction kettles through araw material pump to react, the slurry obtained after the reaction is molten aluminum sulfate octadecahydrate, the molten aluminum sulfate octadecahydrate is conveyed to the steel belt granulator tobe crystallized, granulated and dried, and finally the molten aluminum sulfate octadecahydrate is conveyed to the product tank to be collected. The reaction temperature is controlled to be higher thanthe crystallization temperature, so that the system is in a fluid state and cannot crystallize to block equipment.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of waste sulfuric acid, and in particular relates to a device and method for continuously producing aluminum sulfate octadecahydrate. Background technique [0002] Sulfuric acid is widely used in industrial production, and the used waste sulfuric acid often cannot be directly reused in the original process; unreasonable treatment will cause harm to the ecological environment and waste a lot of resources. [0003] The traditional process uses the concentration method to recover waste sulfuric acid with a concentration greater than 85%, which requires a lot of energy consumption. For the treatment of low-concentration waste sulfuric acid, there is a reactive crystallization process, which reacts with bauxite or aluminum hydroxide to obtain aluminum sulfate or hydrated aluminum sulfate products. This type of process can effectively recover waste sulfuric acid and reduce waste acid e...

Claims

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Application Information

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IPC IPC(8): B01J19/12B01J19/18
CPCB01J19/0046B01J19/126B01J19/1862
Inventor 李琰君杨阿三贾继宁屠美玲张建庭
Owner ZHEJIANG UNIV OF TECH
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