Primary purification equipment for chlor-alkali brine

In the chlor-alkali industry, brine purification is a very crucial step in the production of chlor-alkali products. The main purpose is to remove impurities from brine, especially ions such as calcium and magnesium, as these impurities can significantly affect the efficiency of the electrolysis process and the quality of the product. During the single-stage purification of brine, chemical agents such as sodium hydroxide (NaOH) and barium hydroxide (Ba(OH)2) are typically added to react with calcium and magnesium ions to form precipitates, which are then separated out using filtration devices (calcium-magnesium sludge). The mainstream separation devices currently in use generally include the following types: 1. **Plate and frame filter**: It achieves solid-liquid separation through the filtering medium located between the plates and frames (usually a filter cloth), and is suitable for separating larger particles. 2. **Leaf filter**: This type of filter has a large filtering area, is easy to clean, and is suitable for continuous production processes. The filter leaves inside the leaf filter can be cleaned using methods such as backwashing without shutting down the machine, thereby improving production efficiency. 3. **Centrifugal separators** (such as centrifuges): Use the centrifugal force generated by high-speed rotation to separate solids from liquids, and are suitable for the separation of solids and liquids with smaller particles. 4. **Vacuum filtration equipment**: Such as drum vacuum filters and horizontal belt vacuum filters, they can operate at lower filtration pressure differences and offer good results for washing and dewatering the filter cake. 5. **Filter presses**: Such as diaphragm filter presses and box filter presses, these devices use external pressure to accelerate the filtering process, resulting in a drier filter cake; they are suitable for applications that require efficient dehydration. 6. **Composite filtration equipment**: Combines multiple filtration techniques, such as those that integrate centrifugation with filtration, to improve filtration efficiency and the dryness of the filter cake. Depending on the production scale, properties of the raw materials, and product requirements, when selecting appropriate filtration and separation equipment, enterprises also need to consider factors such as the equipment’s processing capacity, operational complexity, maintenance costs, and energy consumption. In actual production, depending on specific circumstances, equipment selection or technical modifications may be carried out based on experience to achieve the best operating results. .

There are mainly a preprocessor, post-reaction, and brine filter

Is the preprocessor the sedimentation tank? What equipment is used for separating calcium-magnesium slag? Plate-and-frame or ceramic membrane?

The calcium-magnesium slag is ultimately removed from the system by filtering it through a plate and frame filter press; normally, the salt sludge and calcium-magnesium slag settle in the clarification tank of the preprocessor, while the ceramic membrane filters remove additional impurities. All of this material is then sent to the salt sludge tank and subsequently conveyed to the filter press for removal from the system.

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