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A method for forming and drying phosphate rock powder pressure balls

A technology of briquetting forming and phosphate rock powder, applied in the field of phosphorus chemical industry, can solve the problems of cumbersome, lengthy production process, many raw materials added, etc., and achieve the effect of efficient circulation and comprehensive utilization

Active Publication Date: 2016-09-21
YUNNAN TIANAN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-enriched binder produced has many defects such as the addition of many raw materials, the lengthy and cumbersome production process, and the 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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  • A method for forming and drying phosphate rock powder pressure balls

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Comparison scheme
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 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, and then dry it at a temperature of 430°C for 45 minutes to make phosphate rock pellets for the production of yellow phosphorus. The P in the phosphate rock pellets 2 o 5 content increased by 9%.

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, and then dry it at a temperature of 450°C for 50 minutes to make phosphate rock pellets for the production of yellow phosphorus. The P in the phosphate rock pellets 2 o 5 content increased by 8%.

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Abstract

A method for briquetting and drying phosphate rock powder. After crushing, sieving, drying and homogenizing pretreatment, the phosphate rock is made into phosphate rock with a water content of 5% to 8% by weight and a particle size of ≤10mm. powder, adding the binder made of the intermediate product acid slag produced by the wet-process phosphoric acid of the dihydrate method, the weight ratio of the binder to the phosphate rock powder is 3-4:6-7, and uniformly stirred to form a mixture. After being pressed into a ball, it is then dried at a temperature of 400-450°C. The phosphate rock pellets produced by the invention have a P2O5 content increased by 8-10%, a high yield rate, a low return rate, fully utilize the tail gas of the phosphorus furnace, no new energy consumption, save a lot of energy, and realize the efficient synthesis of phosphate rock resources. use.

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