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Defluorination technology of phosphorite powder for producing yellow phosphorus

A technology of phosphate rock powder and phosphate rock, applied in the field of phosphorus chemical industry, can solve the problem of high energy consumption, achieve the effects of safe and stable operation, increase the yield of finished products, and improve the defluorination rate

Active Publication Date: 2014-12-24
YUNNAN TIANAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defluorination rate of this technology is generally only about 40%, and the energy consumption is high due to the addition of coke powder

Method used

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  • Defluorination technology of phosphorite powder for producing yellow phosphorus

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Comparison scheme
Effect test

Embodiment 1

[0012] A defluorination process of phosphate rock powder for yellow phosphorus production. After the phosphate rock is crushed, screened, dried and homogenized, it is made into phosphate rock powder with a water content of 5% by weight and a particle size of ≤10mm. into the mixer, and its outstanding difference from the prior art is: the solids weight percent content made by adding the intermediate product acid slag produced by the dihydrate method wet-process phosphoric acid is 30%, P 2 o 5 The weight percent content is 44% binder, the proportioning of binder and phosphate rock powder weight ratio is 3: 7, stirs 4 minutes evenly, obtains the mixture that weight percent water is 9%, sends into press Press the ball machine into a ball with a diameter of 30mm, preheat and dry it with hot air at a temperature of 120°C for 26 minutes to prevent the green ball from breaking, send it to the rotary kiln, and use the exhaust gas of the phosphorus furnace to roast at a temperature of 8...

Embodiment 2

[0014] A defluorination process of phosphate rock powder for yellow phosphorus production. After the phosphate rock is crushed, screened, dried and homogenized, it is made into phosphate rock powder with a water content of 7% by weight and a particle size of ≤10mm. into the mixer, and its outstanding difference from the prior art is: the solids weight percent content made by adding the intermediate product acid slag produced by the dihydrate method wet-process phosphoric acid is 40%, P 2 o 5 40% by weight of binder, the weight ratio of binder to phosphate rock powder is 4:6, uniformly stirred for 5 minutes to obtain a mixture with 10% water by weight, and sent to the press Press the ball machine into a ball with a diameter of 40mm, preheat and dry it with hot air at 140°C for 28 minutes to prevent the green ball from breaking, send it to the rotary kiln, and use the exhaust gas of the phosphorus furnace to roast at 900°C for 28 minutes. After 32 minutes, part of the fluoride ...

Embodiment 3

[0016] A defluorination process of phosphate rock powder for yellow phosphorus production. After the phosphate rock is crushed, screened, dried and homogenized, it is made into phosphate rock powder with a water content of 8% by weight and a particle size of ≤10mm. into the mixer, and its outstanding difference from the prior art is: the solids weight percent content made by adding the intermediate product acid slag produced by the dihydrate method wet-process phosphoric acid is 50%, P 2 o 5 The weight percent content is 36% of the binder, the weight ratio of the binder to the phosphate rock powder is 4:6, and it is evenly stirred for 6 minutes to obtain a mixture with a weight percent water content of 12%, which is sent into the press Press the ball machine into a ball with a diameter of 50mm, preheat and dry it with hot air at a temperature of 105°C for 30 minutes to prevent the green ball from breaking, send it to the rotary kiln, and use the exhaust gas of the phosphorus f...

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Abstract

The invention discloses a defluorination technology of phosphorite powder for producing yellow phosphorus. The defluorination technology comprises the following steps: performing crushing, screening, drying and homogenization pretreatment on phosphorite to obtain the phosphorite powder of which the water percentage is 5-8 percent and the particle size is not greater than 10 mm; feeding the phosphorite powder in a mixer; adding a binder prepared from acid sludge as an intermediate product produced by using phosphoric acid through a dihydrate wet method, wherein the weight ratio of the binder to the phosphorite powder is (3 to 4):(6 to 7); uniformly stirring the binder and the phosphorite powder to obtain a mixture; after the mixture is pressed to form pellets, preheating and drying the pellets with hot air to prevent the fresh pellets from being broken; baking the pellets at the temperature of 850-950 DEG C in a rotary kiln; decomposing a part of fluoride and volatile substances and cooling with air to reduce the temperature. Phosphate ore pellets produced by the defluorination technology disclosed by the invention are prepared from tails gases of a phosphorus furnace by adopting a unique preheating drying, baking and air cooling technology without the consumption of newly-added coke dust and other energy sources, and the defluorination rate is greatly improved; according to the defluorination technology, the operation of the phosphorus furnace is safe and stable, the amount of phosphorous slurry in the production process of the yellow phosphorus is greatly reduced, the risk of environment safety is reduced, and the finished product rate of the yellow phosphorus is improved.

Description

technical field [0001] The invention relates to a defluorination process of phosphate rock powder for yellow phosphorus production, and belongs to the technical field of phosphorus chemical industry. technical background [0002] As one of the accompanying elements of phosphate rock, fluorine is partially converted to CaF during the reduction reaction of yellow phosphorus. 2 into the slag in the form of SiF 4 The form of sublimation escapes, and with the phosphorus vapor being sprayed and condensed, SiF 4 Hydration reaction occurs to generate viscous substances such as fluorosilicic acid and silica gel, which are easily bonded with yellow phosphorus particles to form colloidal mud phosphorus. The generation of this kind of sludge phosphorus reduces the yield of yellow phosphorus production. At the same time, as a hazardous solid waste, the subsequent treatment of sludge phosphorus also has a great environmental safety risk. [0003] Due to many limitations of capital, equ...

Claims

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Application Information

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IPC IPC(8): C01B25/027
Inventor 吴祥杜建学
Owner YUNNAN TIANAN CHEM CO LTD
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