Precipitation system and precipitation method of rare earth compound

Abstract

The invention discloses a precipitation system and precipitation method of a rare earth compound, and relates to the technical field of rare earth resource recovery. The precipitation system comprisesa dissolving device, a precipitation device, a crystal grain forming device, a standing layering device, a centrifugal dewatering device, a water preparation chamber, a standing recovery pool and a control system. By adding an independent crystal grain forming process, high-quality precipitation is facilitated, washing and filtering are easy, washing of chlorine radicals of the rare earth compound is facilitated, and the quality is stabilized; feeding and crystal nucleus growth are more coordinated, an emulsification phenomenon is effectively solved, and meanwhile, a crystal nucleus materialcan be automatically returned according to a process requirement; the water preparation chamber is arranged for linkage control of secondary washing, so that water is saved, and the defect of large washing water consumption is overcome; electric control is reasonable, dewatering and washing are linked, and operation is convenient; and the whole production process is continuous and smooth, the operation is more simplified, the cost is saved, the energy consumption is reduced, the labor productivity is improved, and the yield is obviously improved.

Description

technical field [0001] The invention relates to the technical field of rare earth resource recovery, in particular to a rare earth compound precipitation system and precipitation method. Background technique [0002] In the process of comprehensive recovery of rare earth resources from NdFeB waste, the single rare earth chloride solution obtained through the separation process needs to be turned into a solid compound. Rare earth precipitation mainly includes several methods such as oxalic acid precipitation, ammonium bicarbonate precipitation and sodium carbonate precipitation. Due to the high cost of oxalic acid precipitation, high ammonia nitrogen in ammonium bicarbonate precipitation wastewater, large water volume and complicated process in sodium carbonate precipitation, according to these conditions, technicians have done a lot of work and carried out various technical explorations. Many new technology research reports, such as continuous precipitation and end point co...

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Problems solved by technology

Due to the high cost of oxalic acid precipitation, high ammonia nitrogen in ammonium bicarbonate precipitation wastewater, large water volume and complicated process in sodium carbonate precipitation, according to these conditions, technicians have done a lot of work and carried out various technical explorations. Many new technology research reports, such as continuous precipitation and end point control, water recycling, etc., but in the process of use of these technologies, there are also general quality stability, difficulty in controlling chloride radicals, large water usage, and easy formation of emulsions in the reaction. Filtration is difficult and cumbersome to operate, and the influence of human factors is large, etc.

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