Powdered rock phosphate pellet pressing, molding and roasting method

A technology of briquette molding and phosphate rock powder, which is applied in the field of phosphorus chemical industry, can solve the problems of lengthy production process, difficulty in controlling the chemical composition of finished products and waste, and many raw materials added, so as to achieve the effect of high efficiency and comprehensive utilization

Active Publication Date: 2015-01-07
YUNNAN TIANAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN 102381690 discloses a medicine made of rare earth elements, sodium chloride, calcium chloride, zinc chloride, sodium carbonate and potassium carbonate in proportion to montmorillonite powder, which is mixed, matured, dried and ball-milled into powder The phosphate rock powder oxygen-en

Method used

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  • Powdered rock phosphate pellet pressing, molding and roasting method

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Embodiment 1

[0011] After crushing, screening, drying and homogenizing pretreatment, the phosphate rock is made into phosphate rock powder with a water content of 5% by weight and a particle size of ≤10mm, which is sent to the mixer and added to the dihydrate wet-process phosphoric acid. The weight percentage of solids made of intermediate product acid slag is 20%, P 2 o 5 The weight percent content is 45% binder, the proportioning ratio of binder and phosphate rock powder weight ratio is 3: 7, stirs evenly for 6 minutes, obtains the mixture that the weight percent moisture 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 120°C for 25 minutes to prevent the green ball from breaking, and then send it to the rotary kiln for 35 minutes at 850°C. After cooling down to below 60°C, it will be made into phosphate rock pellets for the production of yellow phosphorus, and the P in the phosphate rock pellets 2 o 5 content incre...

Embodiment 2

[0013] After crushing, screening, drying and homogenizing pretreatment, the phosphate rock is made into phosphate rock powder with a water content of 7% by weight and a particle size of ≤10mm, which is sent to the mixer and added to the dihydrate method wet-process phosphoric acid. The weight percentage of solids made of intermediate product acid slag is 40%, P 2 o 5 The weight percent content is 38% of the binder, the weight ratio of the binder to the phosphate rock powder is 4:6, and it is evenly stirred for 5 minutes to obtain a mixture with a weight percent water content of 10%, which is sent into 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 27 minutes to prevent the green ball from breaking, and then send it to the rotary kiln for 33 minutes at 900°C. After cooling down to below 70°C, it will be made into phosphate rock pellets for the production of yellow phosphorus. P in the phosphate rock pellets 2...

Embodiment 3

[0015] After crushing, sieving, drying and homogenizing pretreatment, phosphate rock powder is made into phosphate rock powder with a water content of 8% by weight and a particle size of ≤10mm, which is sent to a mixer and produced by adding dihydrate wet-process phosphoric acid. The weight percentage of solids made from intermediate product acid slag is 50%, P 2 o 5 The weight percent content is 35% of the binder, the weight ratio of the binder to the phosphate rock powder is 4:6, and it is stirred evenly for 4 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 180°C for 30 minutes to prevent the green ball from breaking, and then send it to the rotary kiln and bake it at a temperature of 950°C for 30 minutes. After cooling down to below 90°C, it will be made into phosphate rock pellets for the production of yellow ...

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Abstract

The invention discloses a powdered rock phosphate pellet pressing, molding and roasting method. The powdered rock phosphate pellet pressing, molding and roasting method comprises the steps of pretreating phosphorus ores by crushing, sieving, drying and homogenizing to prepare powdered rock phosphate with the water content of 5-8wt% and the particle size of smaller than or equal to 10mm, and adding an adhesive prepared from acid residues as intermediate products of dihydrate wet-process phosphoric acid production, wherein the weight ratio of the adhesive to the powdered rock phosphate is (3-4):(6-7); uniformly stirring to form a mixture; after pressing the mixture to form a pellet, preheating and drying by virtue of hot air to prevent the green pellet from cracking; and roasting in a rotary kiln at the temperature of 850-950 DEG C, and carrying out air cooling. The P2O5 content of a phosphorus ore pellet produced by using the method is increased by 8-10%, the rate of finished products is high, and the return ratio is low; and the tail gas of a phosphorus furnace is sufficiently utilized, and no newly-increased energy consumption is generated, so that a great number of energy sources are saved, and the efficient and comprehensive utilization of phosphate rock resources is realized.

Description

technical field [0001] The invention relates to a method for briquetting and roasting phosphate rock powder, and belongs to the technical field of phosphorus chemical industry. technical background [0002] Phosphate rock is mined, transported, and put into the furnace after crushing, drying, screening and other processing in the factory. The amount of lump ore is only about 50%. If the qualified lump ore is purchased to make phosphorus, it usually loses 15%. ~20%, the remaining phosphate rock powder screened by yellow phosphorus production enterprises is huge, and if it is not used, it will cause great waste of phosphorus resources and serious economic losses. The "Yellow Phosphorus Industry Access Conditions" implemented by the state clearly requires that the mineral powder utilization rate of yellow phosphorus enterprises must reach 100%. Some yellow phosphorus production enterprises try to use phosphate rock powder plus clay or water glass as a binder and then press the...

Claims

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Application Information

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IPC IPC(8): C01B25/01
CPCY02P20/10Y02P20/129
Inventor 吴祥杜建学
Owner YUNNAN TIANAN CHEM CO LTD
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