Decanter centrifuge – solid bowl
Our decanters are individual, functional and versatile. They offer highly efficient separation of even the finest solids with almost complete clarification of the liquid phase.
Sodium Carbonate also known as soda ash or washing soda, is a chemical compound with a wide range of applications. From cleaning and water softening to the food industry, sodium carbonate is an important substance with many practical applications.
What is Sodium Carbonate or Soda Ash?
Sodium carbonate (Na₂CO₃) or soda ash is a white crystalline powder with high water solubility and an alkaline pH.
Depending on temperature and pressure, it crystallizes in different crystal systems – from anhydrous soda ash to decahydrate, known as mineral or crystal soda ash.
Because of its versatile properties, soda ash is used in a wide range of industries and in the home.
Crystal Systems of Sodium Carbonate
Sodium carbonate (Na₂CO₃) can occur in seven different crystal structures. Each has a slightly different arrangement of atoms and molecules, which can result in different physical properties. Soda is one of these seven chemical forms of sodium carbonate. There is also anhydrous sodium carbonate (Na₂CO₃, Mineral: Natrite), sodium carbonate monohydrate (Na₂CO₃·H₂O, Mineral: Thermonatrite), sodium calcium carbonate dihydrate (Na₂Ca(CO₃)₂·2H₂O, Mineral: Pirssonite), sodium calcium carbonate pentahydrate (Na₂Ca(CO₃)₂·5H₂O, Mineral: Gaylussite), sodium carbonate heptahydrate (Na₂CO₃·7 H₂O) and sodium carbonate hydrogen carbonate dihydrate (Na(HCO₃)·Na₂CO₃·2H₂O, Mineral: Trona).
What is soda ash used for?
Soda ash is an indispensable part of our daily lives. From cleaning to manufacturing to environmental technology, soda ash is a versatile helper with a wide range of practical applications.
Soda ash is an effective and environmentally friendly cleaning agent that removes stubborn dirt, grease and stains from a wide variety of surfaces. Soda ash is used in many chemical processes, including the production of acids, alkalis and other chemical compounds. In the manufacture of soaps and detergents, soda is used as an alkali source to increase the cleaning power.
In the iron and glass industries, for example, it is used as a flux. Soda lowers the melting temperature of sand or quartz sand and other glass raw materials and promotes the formation of a homogeneous glass mass. This reduces melting time and makes glass production more economical. In the iron and steel industry, sodium carbonate is used as a flux in the melting of pig iron or in the production of steel.
It is used to desulfurize pig iron and remove impurities such as phosphorus, allowing iron or steel to be melted at lower temperatures, reducing energy consumption and making the process more efficient. In electroplating, sodium carbonate is used as an electrolyte component to coat or polish metals.
It is also used in exhaust gas purification (e.g. flue gas desulfurization) and water treatment. In water treatment, sodium carbonate is used to soften water by binding excess hardness builders such as calcium and magnesium ions. In addition, sodium carbonate is used in some environmental applications, such as treating contaminated soil and neutralizing acidic water.
Sodium carbonate is a component in the production of paper and paperboard, as it dissolves the cellulose and bleaches the paper fibers. It is also used in some paper and board recycling processes to remove ink and dye residues and prepare the paper for reuse.
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How is soda ash produced?
Soda ash is produced in several ways, but the two most common methods are the Solvay process and the trona ore process. Of the total production, 70-80% of soda ash is produced by the conversion of common salt (NaCl). The remaining 20-30% is extracted from naturally occurring soda deposits.
Trona Process
Trona is a natural mineral rich in sodium carbonate (Na₂CO₃) and sodium bicarbonate (NaHCO₃). It is formed by the evaporation of alkaline or salt lakes and is found in large quantities in some regions of the world. Trona is often used as a natural source of soda ash and is mined. To produce pure soda ash with sodium hydrogen carbonate (sodium bicarbonate) as an intermediate product, the mined deposits are recrystallized prior to further processing due to impurities in the source minerals and converted to purified soda ash free of crystalline water by calcination at 200°C.
Solvay Process
The Solvay process is the most widely used method for the industrial production of soda ash. In this multi-step process, the by-product sodium hydrogen carbonate is separated from an ammonium chloride solution and then calcined, i.e. heated at a high temperature (> 200°C). During this process, it decomposes into sodium carbonate (soda), releasing carbon dioxide and water. The sodium carbonate can be obtained as a powder by filtration, centrifugation and drying.
Solvay process for the production of sodium carbonate
When are centrifuges used?
Our screen scroll centrifuges are used in the extraction of soda from natural deposits as well as in chemical processes to separate solids after washing and crystallization.
Criteria for selecting the type of centrifuge
Advantages of a screen scroll centrifuge
- Processing of suspensions even with low solids concentration
- Less sensitive to frequent variations in feed concentration during solids separation
- High G-count and spontaneous dewatering provide low residual moisture
Slijtagebescherming
De centrifuges van SIEBTECHNIK TEMA zijn speciaal geoptimaliseerd voor de betreffende scheidingstaak. Bij de materiaalkeuze hebben austenitisch en ferritisch roestvast staal zich bewezen in de centrifugebouw voor toepassingen onder normale belasting.
Voor processen waarbij schurende materialen worden verwerkt, moeten de centrifuges worden voorzien van een effectieve slijtagebescherming. Al sinds 1922, toen we begonnen met de verwerking van steenkool, hebben we slijtagebeschermingssystemen continu verder ontwikkeld.
Onze centrifuges kunnen worden uitgerust met geavanceerde slijtagebeschermingssystemen van bijvoorbeeld wolfraamcarbide, Stellite® of keramische tegels, om er maar een paar te noemen. Rubber- of matrixcoatings hebben zich ook bewezen in diverse toepassingen.
Indien nodig ontwikkelen onze ingenieurs nieuwe en efficiënte oplossingen op het gebied van coating-, hecht- en verbindingstechnologie voor onze klanten wereldwijd.
Materialen voor centrifugeonderdelen
Centrifugeonderdelen moeten niet alleen bestand zijn tegen hoge krachten, maar ook tegen procesgerelateerde belastingen zoals corrosie, slijtage en hoge temperaturen. Ook de kosten en de beschikbaarheid van materialen spelen een belangrijke rol. Onze klanten kiezen de benodigde materialen die in contact komen met het product op basis van deze zeer specifieke eisen.
Duplex- en hooggelegeerde roestvaste staalsoorten, Hastelloy® en titaniummaterialen voor een breed scala aan processen en belastingen maken deel uit van onze dagelijkse praktijk in de centrifugebouw. Ons kwaliteitsmanagement heeft zeer gedetailleerde en kosteneffectieve processen ontwikkeld voor ontwerp, fabricageprocessen en het testen van componenten op basis van Europese richtlijnen.
Typische plaatwerk- en smeedmaterialen voor componenten die in contact komen met vloeistoffen in centrifuges zijn onder andere
- EN 1.4404 / AISI 316L
- EN 1.4571 / AISI 316Ti
- EN 1.4462 / AISI 318LN / Duplex
- EN 1.4410 / AISI F53 / Super Duplex
- Lean Duplex
- EN 1.4539 / AISI 904L
- EN 1.4547 / 254SMO®
- EN 1.4529 / AISI 926
- EN 2.4819 / INCONEL® Alloy C-276
- EN 2.4602 / Hastelloy® C22
- EN 2.4610 / Hastelloy® C4
- EN 3.7035 / Ti-II / Titan 994-Ti-grade 2
- EN 3.7235 / Ti-IIPd / Titan 994 Pd-Ti-grade 7
- and their casting materials
Elk proces en elke klant heeft zijn eigen specifieke eisen.
SIEBTECHNIK TEMA beschikt over een uitgebreid assortiment aan systemen en componenten, centrifuges en drogers die zijn afgestemd op uw behoeften.
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