Boiling drying of sulfur concentrate
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Dear colleagues and seniors: Hello everyone! In 2022, our company built a new acid production facility capable of processing 400,000 tons of sulfur concentrate, using sulfur concentrate with a sulfur content of around 46% directly. Perhaps because of the requirement in terms of cognition (that the moisture content of raw materials should be ≤7%), a raw material drying device was not considered during the design phase. In reality, the moisture content of the returned sulfur concentrate has long remained around 10-12%, which makes it impossible to sieve it properly and thus insufficient for use in production. To meet the demand for minerals used in production, the mesh size of the screens was changed from 10*10 mm to 15*15 mm, and eventually screens with a mesh size of 30*30 mm were used for screening. This allowed larger particle impurities to enter the fluidized bed furnace, posing a serious threat to its stable operation. The current measure is to regularly discharge coarse slag from the accident slag outlet. To ensure the particle size and moisture content of the raw materials and to provide qualified raw materials for the long-term stable operation of the system, it is necessary and urgent to install a drying device. Based on the existing space, my initial idea is to install a set of fluidized bed drying equipment (I mainly think that fluidized bed furnaces offer great operational flexibility and high efficiency). I would like to ask my colleagues and seniors here: Are there any successful experiences in using boiling drying for sulfur concentrate among our peers, and what is the approximate investment required? Which manufacturer or design institute has superior technology? I would be grateful for your guidance!
It works better if we mix the dry slag discharged from the bottom of the furnace with the wet sulfur concentrate and then sieve it.
I used to use the method of mixing hot slag with ore for drying.
Mixing hot slag with ore is one of the common methods for drying sulfur concentrate. It involves mixing high-temperature slag with wet ore; through heat and mass transfer, the moisture in the wet ore is evaporated and absorbed by the slag, thereby achieving drying. This method can achieve a certain degree of drying effect, but its efficiency and operational flexibility are relatively low. Furthermore, mixing hot slag with ore also presents certain energy consumption and environmental issues. If you already have practical experience with the drying method of mixing ore with hot slag, then before choosing a boiling drying apparatus, you can take the following factors into consideration: 1. Drying efficiency and effectiveness: Boiling drying apparatuses generally offer higher drying efficiency and better drying results compared to the method of mixing ore with hot slag. You can refer to the experience and data of other companies using fluidized bed dryers to assess whether they can meet your requirements. 2. Operational flexibility: The fluidized bed dryer offers greater operational flexibility compared to hot slag mixing for ore processing. You can make adjustments and controls based on production requirements to better meet the needs under different production conditions. 3. Investment costs: The investment cost for a fluidized bed dryer can be high, including expenses for equipment purchase, installation and commissioning, as well as operation and maintenance. You can consult with the supplier or design institute to obtain the specific investment amount. The final choice should take into account technical performance, cost-effectiveness, and the convenience of actual operation. If you have further questions or need more detailed information, feel free to ask. Thank you for your reply! .
Rotary dryers use steam for drying, and they work fairly well. Mineral water cannot boil at high or low temperatures, making fluidization difficult to achieve; therefore, boiling-based drying is not a viable option