Dilute acid filtering device and using method thereof

Abstract

The invention relates to a dilute acid filtering device and a using method of the dilute acid filtering device. The dilute acid filtering device comprises a tank body and a cover body, wherein a filtering and recovering unit is arranged on a clapboard on an inner wall of the tank body; the filtering and recovering unit consists of a filter bag connecting plate, a filter bag arranged on the filter bag connecting plate, and a net bag fixed outside the filter bag; the filtering unit is fixed in the tank body through the clapboard fixed on the inner wall of the tank body; the filtering and recovering unit takes polytetrafluoroethylene as a raw material and forms a film type filter bag with microporosity; the filtering precision of the film type filter bag is less than or equal to 5 mum. Platinum dust, oil and other insoluble impurities entrained in the dilute acid can be effectively removed, the filtering efficiency can be over 98 percent, the highest filtering efficiency is 99.9 percent, and the recovery effect is good.

Description

technical field [0001] The invention relates to a dilute acid filtering device in the production of nitric acid and a use method thereof, and is especially suitable for filtering the dilute acid before entering an absorption tower in the production of nitric acid by a double pressurization method. Background technique [0002] As an important chemical raw material, nitric acid is widely used in many fields such as fertilizer production and national defense industry. In the production process of nitric acid, the contact catalytic oxidation method of ammonia is widely used. The main raw materials are ammonia and air. The ammonia and air are passed through the catalyst platinum net in the oxidation furnace to carry out the catalytic oxidation reaction of ammonia to generate nitric oxide. Gas, nitrogen monoxide is further oxidized to nitrogen dioxide after cooling, and nitrogen dioxide is finally absorbed by water to form nitric acid. During this process, the condensed acid and...

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Problems solved by technology

[0003] At present, the traditional nitric acid production process at home and abroad usually also has a platinum recovery device, which is generally a recovery net method recovery device. This device uses one or more palladium nets with the same shape and size as the platinum net as a recovery The net is arranged under the platinum net. After the gas from the platinum net passes through the trap net, some of the platinum slag brought down by the airflow will remain on the recovery net. However, the platinum recovery rate of this device is low, about 55%. , and because the recovery net is sometimes torn by the airflow when driving and parking, the installation position and installation structure of the recovery net in the oxidation furnace are very demanding, thus increasing the equipment investment and installation difficulty of the oxidation furnace

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