High-efficiency and energy-saving spray-drying and automatic-packaging production method for powdery polyaluminum chloride

Abstract

The invention discloses a high-efficiency and energy-saving spray-drying and automatic-packaging production method for powdery polyaluminum chloride. The method comprises a high-efficiency and energy-saving spray-drying step and a powdery polyaluminum chloride automatic-packaging and discharging step. In the high-efficiency and energy-saving spray-drying step, two spray concentration towers with packing layers are connected in series for removing dust and acidic gas from drying tail gas and concentrating liquid polyaluminum chloride, tail gas at 105 to 110 DEG C produced by spray drying is secondarily utilized, passes through the first and second spray concentration towers to be used as heat sources of the first and second spray concentration towers respectively. The high-efficiency and energy-saving spray-drying and automatic-packaging production method for the powdery polyaluminum chloride is low in production energy consumption, high in production automation degree, humanized and environmentally friendly.

Description

technical field [0001] The invention relates to a production method of powdery polyaluminum chloride, in particular to a production method of powdery polyaluminum chloride with high efficiency, energy-saving spray drying and automatic packaging. 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 in cities in my country is about 1 million tons, but the annual output is only about 600,000 tons. The market gap is very large, and there is a huge potential market application prospect. Although the de...

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Problems solved by technology

[0003] At present, in China's polyaluminum chloride industry, 75% of polyaluminum chloride products are produced by drum drying method, 65% of which are produced by steam drum drying method, 35% are produced by heat transfer oil drum drying method, and only 25% of them are produced by drum drying method. Polyaluminum chloride products are produced by the spray drying method. There are two main reasons: one is that the spray drying method needs to provide a large amount of air during the production process, and the exhaust temperature is high, so the heat taken away is large, and the drying The tail gas is not reused, resulting in high drying energy consumption. Second, the packaging method is still manual packaging. The labor intensity of the workers in the packaging process is high, and the packaging cost is high. The particle size of the powdered polyaluminum chloride product is very fine, and it is easy to generate dust in the air. And absorb moisture to dissolve, corrode the equipment after deliquescence, pollute the environment, and the negative pressure operation in the silo, the actual production shows that it is easy to bridge and block, resulting in unstable output, sometimes large and sometimes small, affecting the accuracy of weighing, It will even affect the production operation. The above is the main reason why the industry has not been able to use automatic packaging

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