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Powdered rock phosphate pellet pressing, molding and drying 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 tediousness, many raw materials added, and difficulty in controlling the chemical composition of finished products and wastes, etc., and achieve the effect of efficient recycling 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 medicament made of rare earth elements, sodium chloride, calcium chloride, zinc chloride, sodium carbonate and potassium carbonate in proportion to montmorillonite powder, after mixing, aging, drying and ball milling into powder The phosphate rock powder oxygen-enriched binder has defects such as many raw materials added, lengthy and cumbersome production process, and difficulty in controlling the chemical composition of the finished product and waste after high-temperature reaction and additional follow-up treatment.

Method used

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  • Powdered rock phosphate pellet pressing, molding and drying method

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Effect test

Embodiment 1

[0011] After the phosphate rock is crushed, screened, dried and homogenized, it is made into a phosphate rock powder with a water content of 5% by weight and a particle size of ≤10mm. The weight percentage of solids made from 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, and then dry it at a temperature of 400°C for 40 minutes to make phosphate rock pellets for yellow phosphorus production. The P in the phosphate rock pellets 2 o 5 content increased by 10%.

Embodiment 2

[0013] After the phosphate rock is crushed, screened, dried and homogenized, it is made into a phosphate rock powder with a water content of 7% by weight and a particle size of ≤10mm. The weight percentage of solids made from product acid slag is 40%, P 2 o 5 The weight percentage 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 percentage water content of 10%, which is sent into the press Press the ball machine into a ball with a diameter of 40mm, and then dry it at a temperature of 430°C for 45 minutes to make phosphate rock pellets for yellow phosphorus production. The P in the phosphate rock pellets 2 o 5 content increased by 9%.

Embodiment 3

[0015] After crushing, screening, drying and homogenizing pretreatment, the phosphate rock is made into phosphate rock powder with a water content of 8% 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 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 evenly stirred 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, and then dry it at a temperature of 450°C for 50 minutes to make phosphate rock pellets for yellow phosphorus production. The P in the phosphate rock pellets 2 o 5 content increased by 8%.

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Abstract

The invention discloses a powdered rock phosphate pellet pressing, molding and drying method. The powdered rock phosphate pellet pressing, molding and drying 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; and after pressing the mixture to form a pellet, drying the pellet at the temperature of 400-450 DEG C. 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 material 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 drying phosphate rock powder, which 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 water glass as a binder and then press the ball to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/027
Inventor 杜建学吴祥
Owner YUNNAN TIANAN CHEM CO LTD
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