Clarification

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Carbonation Process in Sugar Refinery

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The carbonation process is a widely used method for refining sugar from raw sugar melt. It involves the reaction of calcium hydroxide and carbon dioxide to form calcium carbonate, which precipitates and removes impurities and colorants from the sugar solution. The carbonation process has several advantages, such as low capital and operating costs, high color and turbidity removal efficiency, low sugar loss and environmental friendliness. In this blog post, we will explain the main steps and equipment involved in the carbonation process, as well as some tips and best practices to optimize its performance. The goal of the carbonation process is to eliminate impurities that make raw melt liquor cloudy. Carbonation is typically used in refineries before any decolorizing process. It has a positive effect on sugar liquors, reducing color by 40-50% and ash content by 20-25%. Lime and carbon dioxide are added to the sugar liquor to create calcium carbonate precipitates that absorb impurities a...
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Ion Exchange Resins in Sugar Refining: Polishing Liquor for Purity

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After carbonation has done its job — removing suspended solids and reducing color — sugar liquor still contains dissolved ions and trace colorants that can interfere with crystallization and final product quality. That’s where ion exchange resins come in. Acting like molecular magnets, these resins polish the liquor by swapping unwanted ions for more desirable ones, helping refineries achieve the clarity and consistency needed for premium sugar. Let’s explore how the process works, what types of resins are used, and why this step is critical in the refining sequence. 🧲 What Are Ion Exchange Resins? Ion exchange resins are synthetic polymer beads designed to attract and hold specific ions from solution. They work through a reversible chemical exchange — trading ions in the resin for those in the sugar liquor. There are two main types: Cation exchange resins : Remove positively charged ions like calcium (Ca²⁺), magnesium (Mg²⁺), and iron (Fe²⁺), typically exchanging them for sodium (N...
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Milk of Lime Preparation

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Milk of lime(MOL), also known as lime slurry or lime milk, is a suspension of calcium hydroxide Ca(OH)2 in water. It is used in the sugar industry for pH correction and as an auxiliary of flocculation in bleaching of the sugar solution. Milk of lime plays an important role in improving the quality and purity of the sugar product. Lime is an essential and inexpensive clarifying agent used in juice clarification processes such as sulphitation, and carbonation. Preparation of Milk of Lime requires careful selection of raw materials, proper slaking process, adequate mixing and storage conditions, and regular quality control. In this blog post, we will discuss some of the factors that influence the preparation of milk of lime for sugar industries, and provide some tips and best practices to optimize the process. Lime is available in various forms such as quicklime, limestone, and hydrated lime. The raw materials for preparing milk of lime are quicklime (CaO) and water (H2O). As Quicklime an...
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