Energy-saving method for preparing yellow phosphorus from low-quality phosphate ore

Abstract

The invention discloses an energy-saving method for preparing yellow phosphorus from low-quality phosphate ore. According to the method, phosphate ore with P2O5 content of less than 25% is taken as raw material, the drying process is carried out before the balling process in the production process, and the yellow phosphorus reduction production can be carried out after the balling process. The method overcomes the defects in the prior art, complies with the sustainable development policy of China, and comprises the steps of firstly, before baling, carrying out flash drying on wet concentrate after washing, carrying out dynamic calcination, namely, thoroughly burning the phosphate ore, then balling and carrying out reduction treatment to obtain the yellow phosphorus. The method is in accordance with the policies of energy conservation and emission reduction in China, is minimum in energy consumption and lowest in cost on the existing basis, utilizes the phosphate ore to the utmost extent, and solves the problems that the prior art is more in energy consumption and high in production cost, and is not in accordance with the policies of energy conservation and emission reduction in China.

Description

technical field [0001] The invention relates to a method for preparing yellow phosphorus, in particular to an energy-saving method for preparing yellow phosphorus from low-quality phosphate rock. Background technique [0002] The average grade of phosphate rock in my country is the lowest in the world, more than 90% of the phosphate rock grade is lower than 26%, and the average grade is only 16.85%. Except for a few rich ores that can be directly used as raw materials for the production of phosphorus compound fertilizers and yellow phosphorus, most of the ores need to be processed It can only be utilized, and it is difficult to beneficiate. Most small and medium-sized enterprises adopt the mining mode of "mining the rich and discarding the poor", resulting in a large waste of phosphate rock resources. [0003] Phosphate rock resources are non-renewable resources, and are gradually showing scarcity characteristics. The country has realized the importance of phosphate rock, co...

AI Technical Summary

Problems solved by technology

In the calcination process, the shaped phosphate rock must be thoroughly burned to achieve the calcination effect, and the phosphate rock ball itself is tightly squeezed, and the heat utilization rate is low during the drying process, so the energy consumption required for thoroughly drying the formed phosphate rock ball It will be very large, so it is not in line with the basic policy of the country to save energy and reduce emissions if the wet concentrate is directly pelletized and the concentrate is shrunk tightly into a ball for drying treatment before proceeding to the production of yellow phosphorus.

In addition, the production environment of the process of forming balls first, then drying and calcining is poor, which requires high refractory materials for tunnel kilns, and the equipment damage rate is high, which affects normal production

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