Drying production method and device thereof for polyaluminium chloride water purifying agent

Abstract

The invention discloses a drying production method and a device thereof for a polyaluminium chloride water purifying agent. The drying production method comprises the steps of: adopting a fluidized bed roaster as a hot blast stove to supply heat, and dividing high temperature flue gas at the temperature of 800-1000 DEG C into first-part flue gas and second-part flue gas, wherein the first-part flue gas and the second-part flue gas can be suitable for drying polyaluminium chloride liquid prepared by taking aluminum hydroxide, bauxite, calcium aluminate, hydrochloric acid and the like as raw materials through utilizing a one-step method or a two-step method, the content of liquid aluminum oxide can be 9-19%, and the basicity of products can be adapted to 40-98%; after liquid materials are dried, the quality of the drum-dried products meet a national standard GB / T22627-2008, and the quality of the spray-dried products meet the national standard GB15892-2009; and after the liquid is subjected to energy-saving drying, compared with the conventional drying process, 50-90 kg of the coals are saved during the production of each ton of solid products. The drying production method and the drying production device are more suitable for production devices in which the annual output of the single set of the drying device is 20000-50000 tons.

Description

technical field [0001] The invention relates to a drying production method of polyaluminum chloride water purifying agent, in particular to an energy-saving and clean production method of polyaluminum chloride water purifying agent drum drying and spray drying process, and the invention also relates to the realization of the polyaluminum chloride water purifying agent A device for the drying production method of aluminum water purifying agent. Background technique [0002] In the "Guidelines for Key Areas of High-tech Industrialization with Priority Development" jointly compiled by the National Development and Reform Commission and the Ministry of Science and Technology, it is clearly stated that water treatment chemicals should be identified as key products for national priority development. Polyaluminum chloride is the most widely used and used water purification chemical agent. At present, the total demand for water treatment chemicals for industrial water purification i...

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Problems solved by technology

[0004] In fact, fluidized fluidized furnace combustion technology is very mature. The combustion utilization rate of coal is as high as 99%, and it can adapt to coal with different combustion calorific value. Coal calorific value can be used even below 3000kcal / kg. By adding limestone powder for desulfurization, the solid desulfurization rate can reach 60%, and the desulfurization cost is low. However, it has not been successfully promoted in the actual production of the polyaluminum chloride industry, and further research is needed.

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