摘要:
Provided are a phosphate fertilizer that has a high ratio of citric acid-soluble phosphate and can contribute to phosphorus resource saving and energy saving in fertilizer production, and a production method for a phosphate fertilizer. The phosphate fertilizer is obtained by firing a mixed raw material containing: sewage sludge and/or a sewage sludge-derived material; and a calcium source. In addition, the phosphate fertilizer has a content of CaO of 35 to 60 mass%, a content of SiO 2 of 5 to 35 mass%, a content of P 2 O 5 of 5 to 35 mass%, and a content of components except for CaO, SiO 2 , and P 2 O 5 of 30 mass% or less. Further, the production method for a phosphate fertilizer includes: a mixing step of mixing sewage sludge and/or a sewage sludge-derived material with a calcium source and optionally with a silica source to obtain a mixed raw material; and a firing step of firing the mixed raw material by using a firing furnace at 1,150 to 1, 350°C to obtain the phosphate fertilizer as a fired product.
摘要翻译:提供了具有高柠檬酸可溶性磷酸盐比例的磷酸盐肥料,可以有助于磷肥资源节约和节约化肥的生产,以及磷肥的生产方法。 通过焙烧含有污水污泥和/或污水污泥来源的材料的混合原料获得磷酸盐肥料; 和钙源。 另外,磷酸肥料的CaO含量为35〜60质量%,SiO 2的含量为5〜35质量%,P 2 O 5的含量为5〜35质量%,除了 对于CaO,SiO 2和P 2 O 5为30质量%以下。 此外,磷酸肥料的制造方法包括:将污水污泥和/或污水污泥来源的材料与钙源和任选的二氧化硅源混合以获得混合原料的混合步骤; 以及通过使用1150〜1 350℃的烧成炉对混合原料进行烧成,从而得到作为烧成品的磷酸盐肥料的烧成工序。
摘要:
[PROBLEM] To provide a valuable substance recovery device, etc. that can keep equipment costs and operation costs low and can reduce a burden of gas processing after secondary combustion. [SOLUTION] A valuable substance recovery device 1 provided with a calcining furnace 11 that is attached to a cement firing device 2 and a return path 12 for returning an exhaust gas from the calcining furnace to the cement firing device. By effectively utilizing heat generated by the cement firing device in the calcining furnace for recovering valuable substances, equipment for supplying fuel for the calcining furnace becomes unnecessary and operation costs can be kept low. Acidic gases can be processed using a large amount of CaO present inside the cement firing device, making special processing device for processing the acidic gases unnecessary and making it possible to reduce equipment costs and operation costs significantly compared to the past. The calcining furnace is able to take in heat from a lower portion thereof and discharge the same from the return path, and can return the calcining furnace exhaust gas to an 800°C or higher temperature region of the cement firing device via the return path.