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首页> 外国专利> METHOD OF PROCESSING PHOSPHOGYPSUM WASTES TO OBTAIN A CONCENTRATE OF REE AND GYPSUM PLASTER

METHOD OF PROCESSING PHOSPHOGYPSUM WASTES TO OBTAIN A CONCENTRATE OF REE AND GYPSUM PLASTER

机译：处理磷石膏废物以获取浓稀土和石膏的方法

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FIELD: waste processing and disposal.;SUBSTANCE: invention relates to recycling production wastes and environmental protection and can be used in chemical industry and other industries associated with use of rare-earth elements, as well as the binder binding agent of construction gypsum released during production can be used in construction. Extraction of REM from phosphogypsum involves treatment of phosphogypsum with sulfuric acid solution in at least one step, filtration, extraction of insoluble REE precipitate from obtained solution by introduction of acetic acid or its soluble salts at consumption for deposition 35÷95 mol% on REE from a stoichiometrically required amount in a circulating solution in a deficiency while maintaining a pH of the mother solution of less than 3.0. Precipitation of the REE acetates is separated from the mother solution, washed, dried and optionally calcined to obtain a REE concentrate in a salt or oxide form. Separated mother solution containing sulfuric acid and REE in sulphate form is directed as a recycle stream into a unit for neutralization of phosphogypsum, where a balance amount of sulfuric acid is supplied to compensate its losses with salts of REE and gypsum pulp. Filtered phosphogypsum undergoes additional washing from residual amounts of sulphate REE with mother solution, from which precipitate of insoluble REE compounds is separated by way of acetic acid introduction and sediment separation by filtration. Washed phosphogypsum is neutralized with the main calcium compound CaO in order to neutralize trace amounts of sulfuric acid, dried and realized as gypsum.;EFFECT: invention increases degree of recovery of obtained concentrate REE up to 98÷99 % at improvement of its quality, reduction or complete exclusion of waste water discharges by changing types of used reagents and modes of their application.;1 cl, 1 dwg
机译：技术领域：本发明涉及生产废料的回收和环境保护，可用于化学工业和其他与使用稀土元素相关的工业，以及在施工过程中释放的建筑石膏的粘结剂。生产可用于建筑。从磷石膏中提取REM包括在至少一个步骤中用硫酸溶液处理磷石膏，过滤，通过引入乙酸或其可溶性盐从所获得的溶液中提取不溶性REE沉淀物，消耗量为消耗的35÷95 mol％。循环溶液中的化学计量所需量不足，同时保持母液的pH值小于3.0。从母液中分离出REE乙酸盐的沉淀，洗涤，干燥并任选地煅烧以获得盐或氧化物形式的REE浓缩物。将含有硫酸和REE的硫酸盐形式的分离母液作为循环物流引导至中和磷石膏的装置中，在该装置中提供平衡量的硫酸，以补偿其与REE和石膏纸浆盐的损失。过滤后的磷石膏用母液从残留量的硫酸盐REE中进行额外的洗涤，不溶性REE化合物的沉淀物通过引入乙酸和过滤分离沉淀物而分离出来。洗涤后的磷石膏用主要的钙化合物CaO进行中和，以中和痕量的硫酸，干燥并实现为石膏。;效果：本发明在提高质量的同时，将获得的精矿REE的回收率提高了98÷99％，通过改变使用的试剂类型和使用方式减少或完全排除废水排放; 1 cl，1 dwg

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