System and method for preparing polymeric silicate-aluminum sulfate water purifying agent

Abstract

The invention provides a system and method for preparing a polymeric silicate-aluminum sulfate water purifying agent. The system comprises a liquid distributor, an atomizer, a premixing pipe, a coaxial disc mixer and a supergravity machine; the liquid distributor is arranged at the top end of the premixing pipe; the liquid distributor comprises a protection pipe, two independent vertical spraying pipes and a circulating feeding pipe, the two independent vertical spraying pipes and the circulating feeding pipe are arranged on the inner wall of the protection pipe; an atomizer is arranged at the tail end of each vertical spraying pipe; the tail end of the circulating feeding pipe and the atomizers are arranged in the premixing pipe; the supergravity machine comprises a first-stage mass transfer section and a second-stage mass transfer section which are communicated along a vertical direction and are coaxially arranged; the coaxial disc mixer is arranged in the premixing pipe and is coaxial with the supergravity machine; a plurality of open holes are evenly formed in the pipe wall of the premixing pipe; and the bottom end of the second-stage mass transfer section is communicated with the circulating feeding pipe through a peristaltic pump and a material guiding pipe. With the system and method of the invention adopted, the mass transfer rate in a reaction system is increased; and the prepared polymeric silicate-aluminum sulfate solution has a good Alb value and stability and has an 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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