Process for producing calcium chloride from iron black filtrate and fluidized bed drying device for production of calcium chloride

Abstract

The invention discloses a process for producing calcium chloride from iron black filtrate and a fluidized bed drying device for production of the calcium chloride. The process comprises the following steps of adding iron black filtrate and lime milk into a primary treatment reaction tank, then adding activated carbon, fully stirring and reacting, filtering by a plate-and-frame filter press, then discharging liquid into a secondary treatment reaction tank, and then adding hydrogen peroxide and activated carbon, and after sufficient stirring reaction, filtering the liquid again, evaporating through a triple-effect evaporator, and sequentially drying through a spray drying device and a fluidized bed drying device to prepare a calcium chloride product. The problem that the iron black filtrate is difficult to treat can be solved, and a calcium chloride product can be produced; the special structure of the boiling bed plate is matched with the brush roller to sweep materials, so that the materials are in full contact with flowing air; excessive water on materials is rapidly removed through the sponge adsorption mechanism, then the materials are overturned and dried through the overturning drying mechanism, and finally the materials are scattered and dried through cold air through the centrifugal drying mechanism, so that the materials are prevented from caking, and the materials are fully cooled and dried.

Description

Technical field [0001] The present invention relates to the field of wastewater reuse, and in particular, an iron black filtrate has a calcium chloride process and a production boiling bed drying device. Background technique [0002] The iron-black filtrate is a filtrate that produces iron oxide black filtered filtrate. Applicant company's iron-filled filtrate is large, 150-200 square / d, the amount of iron content in the filtrate 50g / L, zinc 10g / L, chloride ion 100000mg / L . Other enterprises have direct discharge of sewage treatment. When the filtrate enters sewage plant, it will produce a large amount of iron-containing sludge, and the chloride content is high, and the biochemical bacteria has adversely affects the difficulty of treatment, and the cost is more costly. Large, more artificial and more drawbacks. [0003] In addition, in the production of calcium chloride, the applicant uses the boiling bed drying device to perform the final drying of calcium chloride produ...

AI Technical Summary

Problems solved by technology

[0004] 1. Calcium chloride containing a certain amount of water is easy to agglomerate when it enters the drying equipment, causing the particle size of calcium chloride particles to exceed the standard;

[0005] 2. During continuous production, if the feed amount of calcium chloride is large, the calcium chloride cannot fully contact with the air flow, and it is difficult to completely take away the moisture on the surface of the calcium chloride particles, which will reduce the product quality; if the feed amount of calcium chloride is small, Although it can guarantee the product quality, it will greatly reduce the production efficiency and increase the production cost of the enterprise

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