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[Chemical Knowledge]：The production and manufacturing method and process of heavy soda ash.

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Heavy soda ash manufacturing method

1. Introduction

Heavy soda ash is an important chemical production raw material, widely used in glass, soap, detergent, food and other fields. In order to meet the needs of heavy soda ash in different fields, it is of great significance to study its manufacturing method. This paper will introduce the manufacturing methods of heavy soda ash in detail, including ammonia alkali method, combined alkali making method and natural alkali processing method.

2. ammonia-alkali method

ammonia-alkali method, also known as Solvay method, is the main method of producing heavy soda ash in the world. The method uses salt, limestone and coke as raw materials, and produces heavy soda ash through calcination, absorption, carbonization, filtration, calcination and other processes. The specific steps are as follows:

1. Calcination: limestone is calcined into quicklime, and then reacted with raw water to generate hydrated lime.
2. Absorption: Mixing salt water with ammonia and introducing carbon dioxide to generate sodium bicarbonate and ammonium chloride.
3. Carbonization: Sodium bicarbonate is crystallized and separated by centrifugation to obtain sodium bicarbonate product.
4. Filtration: The ammonium chloride solution was filtered to obtain the ammonium chloride product.
5. Calcination: Sodium bicarbonate is thermally decomposed in a calciner to produce heavy soda ash and carbon dioxide.

3. joint soda making process

joint soda making process, also known as Hou's soda making process, was founded by the famous Chinese chemist Mr. Hou Debang. The method combines the ammonia-alkali process with the synthetic ammonia process, realizes the recycling of sodium chloride and carbon dioxide, and reduces energy consumption and production costs. The specific steps are as follows:

1. absorption: ammonia and carbon dioxide into salt water, generating sodium bicarbonate and ammonium chloride.
2. Carbonization: Sodium bicarbonate is crystallized and separated by centrifugation to obtain sodium bicarbonate product.
3. Filtration: The ammonium chloride solution was filtered to obtain the ammonium chloride product.
4. Decomposition: The sodium bicarbonate is thermally decomposed in a calciner to produce heavy soda ash and carbon dioxide.
5. Synthesis: Carbon dioxide and ammonia are reacted in a synthetic tower to produce urea and water at the same time.
6. Recovery: return the water to the absorption process for recycling; recover urea as a by-product.

4. trona processing method

trona processing method is the method of using trona mineral resources to produce heavy soda ash. Natural alkali ore is rich in sodium carbonate and sodium bicarbonate, after mining, crushing, dissolving, filtering, evaporation and other processes, you can make heavy soda ash. The specific steps are as follows:

1. Mining: natural alkali ore is mined by mining equipment.
2. Crushing: Crushing the extracted natural alkali ore into a certain particle size ore.
3. Dissolution: The crushed ore is dissolved in water to generate a mixed solution of sodium carbonate and sodium bicarbonate.
4. Filtration: The mixed solution was filtered to remove insoluble impurities.
5. Evaporation: The filtered solution was evaporated to precipitate heavy soda ash.

5. conclusion The manufacturing methods of heavy soda ash in

mainly include ammonia soda method, combined soda making method and natural alkali processing method. Different methods have different advantages and disadvantages and scope of application, according to the actual situation to choose the appropriate method for production. At the same time, it is necessary to pay attention to safety, environmental protection and quality issues in the production process to ensure product quality and efficiency.

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