Preparation equipment and preparation method of sodium nitrate

Abstract

The invention belongs to the technical field of chemical engineering, and particularly relates to a sodium nitrate preparation device and method.The sodium nitrate preparation device comprises a crystallizer, a device body, a guide cylinder and a stirring shaft, a first scraping plate and a second scraping plate are installed on the stirring shaft and the guide cylinder, and crystal scars generated on the inner surface of the crystallizer and the surface of the stirring shaft are removed; re-dissolving and crystallizing in the mother liquor; a spring is mounted on the second scraping plate, the second scraping plate is driven to vibrate under the action of a convex block on the stirring shaft, and crystal scars attached to the second scraping plate are removed; the device is simple in structure, effectively removes crystal scars on the stirring shaft and the inner wall of the crystallizer, and re-dissolves and crystallizes the crystal scars in mother liquor, so that yield reduction caused by the crystal scars on the inner wall of the crystallizer is avoided, meanwhile, the cleaning time of the inner wall of the crystallizer is shortened, and the working time and yield of the crystallizer are increased.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a preparation equipment and a preparation method of sodium nitrate. Background technique [0002] Sodium nitrate can be used as a decolorizing agent for molten caustic soda in the inorganic industry or in the manufacture of other nitrates. Wide range of applications, so the demand for sodium nitrate in many fields is very large. In the crystallization process, the preparation of large-grained crystals can effectively reduce the amount of impurities attached to the surface of the crystal grains, so that the dried product has higher purity and better quality. [0003] The existing technology usually adopts the multi-stage series connection of DTB evaporative crystallizer as the crystallization system. The DTB evaporative crystallizer is the evaporative crystallizer with a guide tube and a baffle plate. The mass transfer is sufficient and rapid, and the crystal grains gr...

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Problems solved by technology

[0004] However, because the motor of the stirring paddle is installed on the upper part of the crystallizer, the stirring shaft is in contact with the boiling surface of the mother liquor, and the mother liquor splashes to the part of the stirring shaft above the boiling liquid surface to form crystal scars, and vibration occurs when the stirring shaft rotates, which increases the fluctuation of the boiling surface of the mother liquor , so that the mother liquor is splashed onto the inner wall of the crystallizer above the boiling liquid level, so that the crystal grains in the mother liquor are attached to the stirring shaft and the inner wall of the crystallizer above the boiling liquid level, thereby reducing the crystallization output; the crystallizer needs to be regularly Clear crystal scars, increase the downtime of the crystallizer, reduce the working time of the crystallizer, thereby reducing the crystallization output of the crystallizer

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