Method for removing harmful elements of wet-process phosphoric acid and derivative products thereof and equipment

A wet-process phosphoric acid, harmful element technology, applied in non-metallic elements, chemical instruments and methods, fluorosilicic acid, etc., can solve the problem of arsenic removal research or industrial experiments that are rarely reported, and reduce raw material consumption, reduce Visual pollution, the effect of improving quality
CN110540179APending Publication Date: 2019-12-06GUIZHOU KAILIN GRP CO LTD
10 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU KAILIN GRP CO LTD
Publication Date
2019-12-06

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to the technical field of treatment of wet-process phosphoric acids, in particular to a method for removing harmful elements of a wet-process phosphoric acid and derivative products thereof and equipment. According to the method for removing the harmful elements of the wet-process phosphoric acid and the derivative products thereof and the equipment, phosphorus pentasulfide is selected as an arsenic removal catalyst, and is added into a wet-process phosphoric acid extracting groove and a wet-process phosphoric acid ageing groove separately, a two-stage harmful element removing reaction is carried out to make arsenic in the wet-process phosphoric acid and the derivative products thereof enter a phosphogypsum stack finally in a form of an insoluble compound As2S3, not only is the arsenic removed, but also heavy metal cations of the harmful elements of Cr, Pb, Cu and the like in the wet-process phosphoric acid and the derivative products thereof are removed at the same time, the quality of the wet-process phosphoric acid and the derivative products thereof is improved, harmful elements in an obtained phosphate fertilizer are reduced, and a by-product hydrogen sulfide gas is used as a reducer of iodine molecules in extracted tail gas, so that consumption of a liquid SO2 raw material in an iodine recovery system is reduced, visual pollution of red smoke from the extracted tail gas is reduced, and iodine molecule resources are recovered.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of wet-process phosphoric acid treatment, in particular to a method and equipment for removing harmful elements of wet-process phosphoric acid and its derivative products. Background technique

[0002] At present, in the production process of phosphate fertilizer, because concentrated phosphoric acid contains a certain amount of arsenic (about 50-60ppm), the arsenic content in phosphate fertilizer products is about 80ppm, which is far from the implementation standard of class I products As%≤0.005 and the quality of foreign products. There is still a certain gap in the execution standard of As%≤0.002.

[0003] At present, the industrial arsenic removal of phosphoric acid and its derivatives is mainly used for the removal of arsenic of food-grade or electronic-grade related products. There are very few reports on direct research or industrial experiments on the removal of arsenic from wet-process phosphoric a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More