A system and method for preparing polysilicon aluminum sulfate water purifying agent

Abstract

The invention provides a system and method for preparing polysilicon aluminum sulfate water purifying agent. The system includes a liquid distributor, an atomizer, a pre-mixing tube, a coaxial disc mixer and a supergravity machine. The liquid distributor is set at the pre- At the top of the mixing pipe, the liquid distributor includes a protection pipe and two independent vertical spray pipes on the inner wall of the protection pipe and a circulation feed pipe. An atomizer is arranged at the end of each vertical spray pipe, and the circulation The end of the feeding pipe and the atomizer are both arranged in the premixing pipe. The supergravity machine includes a first-stage mass transfer section and a second-stage mass transfer section that are connected up and down and arranged coaxially. The coaxial disc mixer is arranged in the premixing pipe. Arranged coaxially with the supergravity machine, a number of openings are evenly opened on the wall of the premixing tube, and the bottom of the secondary mass transfer section is connected to the circulating feeding tube through a peristaltic pump and a feeding tube. The invention improves the mass transfer rate in the reaction system, and the prepared polysilicon aluminum sulfate solution has good Alb value and stability, and has obvious treatment effect on oily sewage.

Description

technical field [0001] The invention belongs to the technical field of preparing polysilicon aluminum sulfate, and in particular relates to a system and method for preparing polysilicon aluminum sulfate water purifying agent. Background technique [0002] The preparation of polysilicoaluminum sulfate was first proposed by the Canadian Handy Chemical Company as early as 1989, and then a plant was built in 1991 with an annual production capacity of 60 million pounds. The preparation of this polysilicoaluminum sulfate is to slowly drop water glass and sodium aluminate solution into the aluminum sulfate solution under the cooperation of low temperature and high speed stirring, and control the drop rate to prevent the addition of alkali from forming insoluble objects in the solution, Then slowly heat up to a certain temperature, digest the insoluble matter in the solution at high temperature, and finally ripen to prepare colorless and transparent polysilicon aluminum sulfate with...

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Problems solved by technology

[0003] In view of this, the present invention aims to propose a system and method for preparing polysilicon aluminum sulfate water purifying agent, by using a liquid distributor equipped with an atomizer and matching a supergravity machine with a secondary mass transfer, the reaction rate is improved. The mass transfer rate in the system further solves the problems of low temperature, slow addition of alkali, slow temperature rise, high temperature digestion and temperature-returning ripening, that is, the system temperature does not need to be lowered to 10°C but normal temperature during the alkali addition process, and the alkali addition speed is also No need for slow control, eliminating the need for external heating but relying on the self-heating of the reaction system, and eliminating the need for high-temperature digestion and back-temperature curing processes, which greatly simplifies the preparation process of polysilicon aluminum sulfate

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