HOMECreating Sodium Hydroxide product

Creating Sodium Hydroxide product

case-study-creating-product-picIn this project work was done to achieve technological and product advancement for recycling of spent sodium hydroxide (NaOH). Customer's approach was to utilize spent solid sodium hydroxide as a byproduct generated from testing facility. The testing facility uses solid sodium hydroxide to melt and dissolve ore material. The focus of experimental work was on developing alternatives to recycle or reuse sodium hydroxide. This can be accomplished by dissolving spent sodium hydroxide in a controlled environment and purifying sodium hydroxide to meet specification for its reuse. It was examined several liquid/solid separation techniques related to purification of concentrated sodium hydroxide. Our technical staff proposed that the testing should be directed towards optimal liquid solution to make it easier for liquid/solid separation of sodium hydroxide product. It was also recommended to identify only those applications, which can accept increased content of soluble impurities in the sodium hydroxide product. We have decided to conduct lab and bench-scale tests in order to establish an optimum concentration of liquid sodium hydroxide and its temperature that could be used for further testing of liquid/solid phase separation which lead to a product with best chance to be applied on the market. The results of the lab study were used to develop pilot-scale test procedures. The pilot system consisted of components to carry out a series of experiments to investigate the reaction of sodium hydroxide dissolved in solution and different processing regimes. After that, different liquid/solid separation techniques were tested to optimize the process of solid separation from sodium hydroxide. Filtration through filter press was chosen as the best separation process. The goals of this project was to establish a dissolving regime and effects of reaction on processing and optimizing parameters such as retention time, maximum temperature, water content and feed flow rates. The set of operating protocols that were used for the pilot-scale trials were later adapted to the full-scale system.

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