Technology and device for co-producing ofproducing industrial monoammonium phosphate and co-producing high-quality monoammonium phosphate by utilizing middle-grade and low-grade collophanite

Abstract

The invention discloses a technology and a device for co-producing ofproducing industrial monoammonium phosphate and co-producing high-quality monoammonium phosphate by utilizing middle-grade and low-grade collophanite. The technology comprises the following steps: carrying out ore dressing on the middle-grade and low-grade collophanite by utilizing a heavy medium-double-reverse flotation technology to prepare phosphorus concentrate pulp with the mass percent of 32 percent or more based on P2O5; extracting the phosphorus concentrate pulp by utilizing sulfuric acid to obtain phosphoric acid ore pulp; carrying out high-temperature and vacuum filtering on the phosphoric acid ore pulp under the conditions that the temperature is 83 DEG C to 85 DEG C and the pressure is -0.06MPa to -0.07MPa, so as to obtain a phosphoric acid solution; adding a sedimentation agent into the phosphoric acid solution and carrying out sedimentation and filtering to further remove impurities; finally, obtaining a phosphoric acid solution with the P2O5 beingmass percent of 27 percent to 30 percent based on the P2O5; adding the obtained phosphoric acid solution into an ammoniation reactor and carrying out neutralization on the phosphoric acid solution and ammonia; controlling the neutralization degree to be 1.1 to 1.15 and the reaction temperature to be 90 DEG C to 100 DEG C; after finishing neutralization reaction, cooling and crystallizing; then filtering, and concentrating and crystallizing filtrate to obtain the industrial monoammonium phosphate; concentrating and granulating filtering residues to obtain the high-quality monoammonium phosphate. By adopting the technology and the device, disclosed by the invention, the key problem that the phosphorous content of wet-process phosphoric acid produced by from middle-grade and low-grade phosphorous ore and down-stream products thereof is low is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical manufacturing, and relates to a process and a device for producing industrial monoammonium phosphate and co-producing high-quality monoammonium phosphate by utilizing medium and low-grade collophosphate rock. Background technique [0002] my country is rich in phosphorus resources, and its reserves rank second in the world, mainly concentrated in Yunnan, Guizhou, Sichuan and Hubei provinces, of which Hubei accounts for about 10%. However, the national average grade of phosphate rock is not high, P 2 O 5 The rich ore with a content of more than 30% only accounts for 7% of the total reserves. Most of the phosphate ore is of medium and low grade, and more than 85% of the medium and low grade phosphate ore is the collophosphate ore that is not easy to be selected and enriched. P 2 O 5 The medium and low grade phosphate rock with a content of less than 26% is cheap, but the utilization ...

AI Technical Summary

Problems solved by technology

The annual mining volume of lean ore reaches about 80 million tons. If these low- and medium-grade collophosite resources cannot be fully and effectively utilized, there will be a huge waste of resources, which will have a very negative impact on the sustainable and healthy development of the phosphorus chemical industry in Yichang.

[0003] It is difficult to utilize medium and low-grade phosphate rock, especially the utilization of medium-low grade collophosite with high metal impurity content in Yichang has problems such as easy scaling, easy clogging, poor production stability, heavy equipment load, high production cost, and low economy.

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