Device and process for extracting phosphorus from phosphorus mud

Abstract

The invention provides a device and process for extracting phosphorus from phosphorus mud. According to the device, phosphorus mud is heated by using a fused salt in a phosphorus mud evaporator with agood sealing property in a heat conduction mode, phosphorus vapor obtained through heating is fed into a phosphorus mud recycling device for condensation recycling, and then yellow phosphorus mud ofhigh quality is obtained; meanwhile, an emergent blowback device is additionally arranged, so that the device can be normally powered on in case of special working conditions; the heating medium, namely the fused salt, is distributed in a shell heating interlayer, an end cover heating interlayer and a stirring shaft system of the phosphorus mud evaporator through a heat source device, the contactarea of the phosphorus mud with a heat source is increased, heat carrying loss is avoided, the utilization rate of heat is increased, and the energy consumption is reduced by 30% when being compared with that of the prior art; meanwhile, a heating evaporation device of a small size and a large heat exchange area is achieved, and the capital construction cost can be reduced; and by adopting the device and the process provided by the invention, the extraction rate of the yellow phosphorus is up to 98% or greater, and the quality of the yellow phosphorus meets superior product standards of GB / T7816-2018.

Description

technical field [0001] The invention relates to the technical field of chemical engineering and environmental protection, in particular to a device and process for extracting phosphorus from phosphorus mud. Background technique [0002] Yellow phosphorus production enterprises will produce a large amount of phosphorus sludge in the process of producing yellow phosphorus, and about 8% of yellow phosphorus still remains in the phosphorus sludge. In order to effectively use the residual yellow phosphorus in the phosphorus sludge, the phosphorus sludge needs to be treated To recycle the yellow phosphorus therein; at present, there are mainly two traditional methods for processing phosphorus sludge: one is to prepare phosphoric acid, which is simple in technology, but the disadvantage is that it is easy to cause environmental pollution, and the value of phosphoric acid produced is low, which is difficult for enterprises to store and transport. 1, sales burden; the second is to us...

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Problems solved by technology

[0003] Based on this, the purpose of the present invention is to address the deficiencies in the prior art, and propose a phosphorus sludge extraction device and process, which solves the difficulties in equipment sealing, high production energy consumption, secondary pollution, and phosphorus extraction rate in the phosphorus extraction process. Low cost, frequent equipment maintenance and other issues, achieved high extraction efficiency, low energy consumption, clean and safe environment

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