Method and device for impurity removal and filtration of crude ammonium perrhenate solution

Abstract

The invention discloses a method and device for impurity removal and filtration of a crude ammonium perrhenate solution. The method comprises the following steps of 1, heating and dissolving crude ammonium perrhenate to obtain the crude ammonium perrhenate solution, wherein the dissolution temperature is 80-90 DEG C; 2, filtering the crude ammonium perrhenate solution by adopting a circulating cross-flow filtration method to obtain ammonium perrhenate clear liquid, wherein a filtering medium is a filter membrane, the filtering pressure is 0.3-0.4 MP, the filtering flow rate is 3.5-8 m<3> / H, and the filtering membrane precision is 10-50 nm; and 3, crystallizing and purifying the ammonium perrhenate clear liquid to obtain ammonium perrhenate crystals. The device is provided with a raw material tank, a filter membrane component and a clear liquid tank, wherein the raw material tank communicates with the concentrated liquid outlet end of the filter membrane component through a circulatingpipeline to achieve circulating filtration; and the clear liquid tank communicates with the clear liquid outlet end of the filter membrane component through a pipeline to achieve clear liquid collection. According to the preliminary estimation, the filtering efficiency is improved to 3-5 times that of an original filtering device, the impurity content of the filtered clear liquid is obviously reduced compared with that before, and the purity of ammonium perrhenate obtained by primary freezing crystallization reaches 96.3% or more.

Description

technical field [0001] The invention belongs to the technical field of solid-liquid separation equipment, and relates to a method and device for removing impurities and filtering crude ammonium perrhenate solution. Background technique [0002] In the rhenium metal recovery system, the crude ammonium perrhenate solution contains high rhenium content, many impurities and fine particle size, and the solution is generally in a supersaturated state at room temperature, and the decrease in temperature during the filtration process will lead to the appearance of crystals, making it difficult to filter solids and liquids Separation, currently the existing filtration methods in the industry have low efficiency and high loss of rhenium. [0003] Atmospheric pressure filtration: This method is simple in equipment and easy to operate. Generally, a filter tank is set up, and the filtration accuracy of filter cloth is 100-200 mesh. The filter cloth is blocked, causing difficulty in filt...

AI Technical Summary

Problems solved by technology

At present, the main filtration methods for crude ammonium perrhenate in the industry are concentrated on traditional "dead-end filtration" and "filter cake filtration", which are not suitable for solid-liquid separation and filtration of crude ammonium perrhenate supersaturated solution. On the basis of the traditional filtration method, the company proposed an improvement plan, and adopted the high-temperature negative pressure thermal filtration method, which improved the solid-liquid separation efficiency, but still could not completely meet the solid-liquid separation process equipment requirements for the crude ammonium perrhenate solution.

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