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Method for granulating, molding and calcining ground phosphorite

A technology of phosphate rock powder and phosphate rock, applied in the field of phosphorus chemical industry, can solve the problems of cumbersome, difficult to control the chemical composition of finished products and wastes, and many raw materials to be added, so as to achieve the effect of efficient 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-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.

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  • Method for granulating, molding and calcining ground phosphorite

Examples

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Embodiment 1

[0011] A method for granulating and roasting phosphate rock powder. 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, and then sent to a ball mill. After the phosphate rock is ground to a particle size of ≤0.1mm, it is added to a disc granulator, and the acid slag, an intermediate product produced by the dihydrate method wet-process phosphoric acid, is evenly added. The weight percentage of solids is 15%, P 2 o 5 The weight percentage is 46% of the binder, and the weight ratio of the binder to the phosphate rock powder is 3:7, so that the phosphate rock powder is bonded to each other and made into phosphate rock pellets with a particle size of 20mm. The chain grate roaster is fed with the tail gas of the phosphorus furnace, roasted at 850°C for 20 minutes, and then enters the chain grate cooler, and the temperature is cooled to below 70°C by air cooling,...

Embodiment 2

[0013] A method for granulating and roasting phosphate rock powder. After crushing, sieving, drying and homogenizing pretreatment, the phosphate rock powder is made into phosphate rock powder with a water content of 7% by weight and a particle size of ≤10 mm, which is sent into a ball mill. After the phosphate rock is ground to a particle size of ≤0.1mm, it is added to a disc granulator, and the acid slag, an intermediate product produced by the dihydrate wet process phosphoric acid, is evenly added. The weight percentage of solids is 25%, P 2 o 5 The weight percentage is 42% of the binder, and the weight ratio of the binder to the phosphate rock powder is 3:7, so that the phosphate rock powder is bonded to each other, and the phosphate rock pellets with a particle size of 25mm are made into phosphate rock pellets. The chain grate roasting machine is fed with the exhaust gas of the phosphorus furnace, roasted at 900°C for 25 minutes, then enters the chain grate cooler, and is ...

Embodiment 3

[0015] A method for granulating and roasting phosphate rock powder. After crushing, sieving, drying and homogenizing pretreatment, the phosphate rock powder is made into phosphate rock powder with a water content of 8% by weight and a particle size of ≤10mm, and is sent into a ball mill. After the phosphate rock is ground to a particle size of ≤0.1mm, it is added to a disc granulator, and the acid slag, an intermediate product produced by the dihydrate wet-process phosphoric acid, is evenly added. The weight percentage of solids is 35%, P 2 o 5 The weight percentage is 36% of the binder, and the weight ratio of the binder to the phosphate rock powder is 3:7, so that the phosphate rock powder is bonded to each other and made into a phosphate rock pellet with a particle size of 30mm. Chain grate roasting machine, feed the exhaust gas of phosphorus furnace, roast at 950°C for 30 minutes, then enter the chain grate cooler, cool down to below 90°C through air cooling, and then make...

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Abstract

The invention relates to a method for granulating, molding and calcining ground phosphorite. The method comprises the steps of crushing phosphorite, screening, drying and carrying out homogenizing pretreatment to obtain ground phosphorite, feeding the ground phosphorite into a ball mill for grinding, adding fine ground phosphorite into a circular-disc granulator, evenly adding a binder prepared from an intermediate product acid slag in production of phosphoric acid by virtue of a dihydrate wet process in proportion so that the fine ground phosphorite is bound with each other and phosphorite pellets of which the particle sizes reach 20-30mm are prepared, introducing phosphorus furnace tail gas into a chain-grate-type calcining machine, calcining at a temperature of 850-950 DEG C and cooling with air to obtain the phosphorite pellets for production of yellow phosphorus. According to the method, the intermediate product in the production process is fully utilized, is processed into an auxiliary material and directly returns back to the production process, newly added other raw auxiliary materials and the consumption of energy, such as coke powder are not needed; by virtue of phosphorus furnace tail gas and unique calcining and air cooling processes, the content of P2O5 in the ground phosphorite pellets is increased by 8-10% and the silicon-calcium ratio (acidity coefficient Mk) in the phosphorite pellets is not increased, and thus the efficient comprehensive utilization of phosphate resources is achieved.

Description

technical field [0001] The invention relates to a method for granulating, forming and roasting 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 clay or water glass as a binder, then g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/01
Inventor 杜建学吴祥
Owner YUNNAN TIANAN CHEM CO LTD
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