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Minimizing particle breakage and mother liquor residue in technical salts production

By Andritz |

Technical salts and crystallization products have found a broad spectrum of different applications in the industrial sector in the past decades. One of the most frequently used salts is sodium chloride, which is an important component in the human diet, but also as a raw material in the chemical industry or as deicing salt for the highway services in winter. Other common forms of salt are potassium nitrate and ammonium sulfate, which are used often as fertilizer. 

However, the production of these salts is a complex matter, especially when strict quality attributes and efficiency are required. Mechanical dewatering is an important step in this process and usually performed by centrifugation. This paper will show by means of the example of a continuously operating pusher centrifuge how to achieve optimum product quality, maximum energy efficiency and operation with a minimum of downtime by adapting the centrifuge specifically to the needs of the market. In particular, the paper will also describe the most important innovations of the past decade, 2010-2020.

A pusher centrifuge is a type of filter centrifuge. To be more precise, it is a continuously operating filtration centrifuge that is used in many branches of industry – also in the treatment of technical salts. A preferred field of application of pusher centrifuges is the processing of fast-filtering bulk products. Normally, pusher centrifuges operate best at solids concentrations of >40% and an average particle diameter of (dp50) > 100 µm. However, these limits are far more flexible now than they were just a few years ago – as will be explained in the course of this paper.

Download the Whitepaper down below for deeper insights into the latest innovations for filter centrifuges in the technical salt production.