Fundamental Study for The Production of Metallurgical Coke by Hydrothermal Treatment

水热处理生产冶金焦的基础研究

• 批准号: 03650536
• 负责人: TOKUDA Masanori
• 金额: $ 1.28万
• 依托单位: Institute for Advanced Materials Processing, Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650536/
• 关键词: Hydrothermal; Coal; Alkaline; Extraction; Pre treatment; Sodium hydroxide; Calcium hydroxide; Autoclave; 石炭; クリ-ンエネルギ-; 脱灰分; アルカリ水熱反応; 脱燐; 溶解度

The extraction behavior of mineral impurities from Brazilian coal was investigated from 180 to 250ﾟC in the Ca(OH)_2/NaOH solution...Among them, removal of phosphorus was better realized than other inert matters. The phosphorus extraction reached the highest results at lower temperatures between 180ﾟC and 200ﾟC.It was also found that lower concentrations could give better results; especially in the case of Ca(OH)_2. Using Ca(OH)_2, the better concentration range was considered to be from 0.5 mol/kg-H_2O to 1.0 mol/kg-H_2O. NaOH 2.0 mol/kg-H_2O leads more phosphorus to be removal. In the case of NaOH, significant lost of coal matter was observed either for the temperature increasing or for the concentration increasing. When the temperature goes up more than 200ﾟC, the calcium-phosphate complexes convert into hardly soluble matter such as hydroxyl apatite and turn back to the residue again.The SiO_2 and Al_2O_3 behaviors are quite similar: the higher the temperature and the reagent concentration, the higher the extraction degree of SiO_2 and Al_2O_3 in the case of NaOH. In addition, the increasing of temperature can promote more removal of SiO_2. The Ca(OH)_2 was not effective for SiO_2 and Al_2O_3 extraction.Compared the effects of Ca(OH)_2 and NaOH, Ca(OH)_2 showed more promising results. Furthermore, Ca(OH)_2 is much suitable than NaOH in the production factory. Nevertheless at atmospheric pressure conditions, hot water bath, NaOH is better than Ca(OH)_2 for removing phosphorus.

研究了180​​~250°C在Ca(OH)_2/NaOH溶液中从巴西煤炭中矿物杂质的萃取行为...其中，磷的去除比其他惰性物质更好地实现。磷的提取在180°C至200°C之间的较低温度下达到最高效果。同时还发现较低的浓度可以获得更好的效果；特别是在 Ca(OH)_2 的情况下。使用Ca(OH)_2,认为较好的浓度范围为0.5 mol/kg-H_2O至1.0 mol/kg-H_2O。 NaOH 2.0 mol/kg-H_2O导致更多的磷被去除。在 NaOH 的情况下，随着温度的升高或浓度的增加，观察到煤质的显着损失。当温度升高到200℃以上时，磷酸钙络合物转化为难溶物如羟基磷灰石，并再次变回残留物。SiO_2和Al_2O_3的行为非常相似：在NaOH的情况下，温度和试剂浓度越高，SiO_2和Al_2O_3的萃取度越高。另外，温度的升高可以促进更多的SiO_2去除。 Ca(OH)_2对SiO_2和Al_2O_3的萃取效果不佳。比较Ca(OH)_2和NaOH的效果，Ca(OH)_2显示出更有希望的结果。此外，Ca(OH)_2比NaOH更适合生产工厂。但在常压条件、热水浴下，NaOH的除磷效果优于Ca(OH)_2。