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

A phosphate rock, low-quality technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as high requirements for refractory materials in tunnel kilns, failure to meet energy saving and emission reduction, and affect normal production, etc., to achieve fast and efficient Utilize heat energy, save thorough drying time, and have the effect of no dust leakage

Inactive Publication Date: 2013-12-25
罗宗恬
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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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

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] with P 2 o 5 24.59%, CaO 43.61%, SiO 2 9.7%, CO 2 10.86% phosphate rock is used as the raw ore. After the raw ore is pretreated, it is different from the existing technology. It is first dried and then pelletized to obtain a content of P 2 o 5 29.80%, CaO 42.24%,, SiO 2 14.12%, CO 2 <0.5% phosphate rock, and finally use the electric furnace reduction production method to obtain yellow phosphorus.

[0032] Choosing low-quality phosphate rock as the raw material for yellow phosphorus production avoids the mining mode of "mining the rich and abandoning the poor" adopted by most small and medium-sized enterprises today, thereby rationally utilizing mineral resources and avoiding a large amount of waste of phosphate rock resources.

[0033] In addition, the existing methods for preparing yellow phosphorus all use the method of first forming into balls and then drying and then reducing. Since the spheres will be firmly squeezed during the process of forming into ba...

Embodiment 2

[0040] Similar to Example 1, the ball forming process is placed after the drying process. The difference is that in Example 2, flash drying is used in the drying process, specifically:

[0041] with P 2 o 5 24.59%, CaO 43.61%, SiO 2 9.7%, CO 210.86% phosphate rock is used as the raw ore. After the raw ore is pulverized and pretreated, the wet phosphate rock powder is obtained. The wet phosphate rock powder is sent into the dryer with a screw feeder, and the heat generated by calcination is used for heat exchange. After absorbing the cold fluid of the device, it is used as a drying heat source - hot air. The hot air flash-dries the wet phosphate rock powder at an inlet temperature of 300-350°C or 350-400°C at a speed of 5-9m / s to obtain a dry phosphate rock powder. At this time, the outlet temperature at the outlet of the dryer is 50≤T<100°C. After collecting the dry phosphate rock powder with a cyclone separator and preheating it, put it into the calciner, and the calcine...

Embodiment 3

[0046] Similar to the steps of Example 2, different from Example 2, the calcination process has adopted a dynamic calcination process, specifically:

[0047] with P 2 o 5 24.59%, CaO 43.61%, SiO 2 9.7%, CO 2 10.86% phosphate rock is used as the raw ore. After the raw ore is washed and pretreated, the wet phosphate rock powder is obtained. The wet phosphate rock powder is sent into the dryer with a screw feeder, and the heat of the exhaust gas generated by calcination is used for heat exchange. After absorbing the cold fluid of the device, it is used as a drying heat source - hot air, and the hot air is used at a speed of 10-15m / s to flash-dry the phosphate rock powder at an inlet temperature of 400-450°C or 450-500°C to obtain a dry phosphate rock powder. The outlet temperature at the outlet of the dryer is 100≤T<150°C. The dry phosphate rock powder is collected by a cyclone separator and preheated, and then put into the calciner. During calcination, the dry phosphate ro...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/027
Inventor 罗宗恬董和平林江程子亮王长胜杜星罗辉张伟
Owner 罗宗恬
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