17600 - oapi.int

ORGANISATION AFRICAINE DE LA PROPRIETE INTELLECTUELLE Inter. CI. N° FASCICULE DE BREVET D’INVENTION 17600 8 O.A.P.I. – B.P. 887, YAOUNDE (Cameroun) – Tel. (237) 222 20 57 00– Fax: (237) 222 20 57 27– Site web: http:/www.oapi.int – Email: [email protected] 19 11 51 21 22 30 73 72 74 24 45 54 Abrégé : Disclosed is a rotary kiln for reducing phosphate ore in kiln process for production of phosphoric acid, comprising a kiln body, a kiln head box, a kiln tail box and a driving device for driving the rotation of the kiln body, wherein a fuel burner is provided at the kiln head, a feeding pipe and an outlet flue connected to an external hydration tower are provided at the kiln tail box, the upper part of the kiln body is provided with no air pipe, the outlet flue is provided in the radius range of the kiln body with the axis of the rotary kiln as a centre, and the smoke conveying direction in the outlet flue is substantially parallel to the axis direction of the rotary kiln or has an included angle of less than 45°thereto. When using the rotary kiln of the present invention for the kiln process for the production of phosphoric acid, and raw materials enter from the kiln tail box, the fuel burner is ignited for heating, the phosphate ore raw material is reduced under a high-temperature condition to produce a smoke exiting the kiln, and in the present invention, the smoke exiting the kiln is allowed to enter the outlet flue without large shifting, thereby preventing the centrifugal physical sedimentation at the kiln tail such that the metaphosphoric acid in the kiln smoke directly enters the hydration tower along with the kiln smoke. The present invention can effectively mitigate the phenomenon of ring forming in the kiln tail of the rotary kiln. Titre : Rotary kiln for reducing phosphate ore in kiln process for production of phosphoric acid and method for solving ring forming in kiln tail in kiln process for production of phosphoric acid. Numéro de dépôt : 1201500482 (PCT/CN13/081164) Titulaire(s) : SICHUAN KO CHANG TECHNOLOGY CO., LTD, Tower 1, Triunph Plaza, No. 118, Jitai 5th Road, High-Tech Zone, CHENGDU 610041, Sichuan (CN) Date de dépôt : 09/08/2013 Priorité(s) : CN n° 201310218599.1 du 04/06/2013 Délivré le : 29/07/2016 Publié le : 28.04.2017 Inventeur(s) : HOU, Yonghe (CN) WEI, Shifa (CN) WANG, Pengsheng (CN) WANG, Jiabin (CN) Mandataire : SCP AKKUM, AKKUM & Associates, Quartier Mballa II, Dragages, B.P. 4966, YAOUNDE (CM). 57 C01B 25/18 Fig. 1

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ORGANISATION AFRICAINE DE LA PROPRIETE INTELLECTUELLE

Inter. C

N°

FASCICULE DE BREVET D’INVENTION

17600

7424

Abrégé :

Disclosed is a rotary kiln for reducing phosphate ore in kilnprocess for production of phosphoric acid, comprising a kilnbody, a kiln head box, a kiln tail box and a driving device fordriving the rotation of the kiln body, wherein a fuel burner isprovided at the kiln head, a feeding pipe and an outlet flueconnected to an external hydration tower are provided atthe kiln tail box, the upper part of the kiln body is providedwith no air pipe, the outlet flue is provided in the radiusrange of the kiln body with the axis of the rotary kiln as acentre, and the smoke conveying direction in the outlet flueis substantially parallel to the axis direction of the rotary kilnor has an included angle of less than 45°thereto. Whenusing the rotary kiln of the present invention for the kilnprocess for the production of phosphoric acid, and rawmaterials enter from the kiln tail box, the fuel burner isignited for heating, the phosphate ore raw material isreduced under a high-temperature condition to produce asmoke exiting the kiln, and in the present invention, thesmoke exiting the kiln is allowed to enter the outlet fluewithout large shifting, thereby preventing the centrifugalphysical sedimentation at the kiln tail such that themetaphosphoric acid in the kiln smoke directly enters thehydration tower along with the kiln smoke. The presentinvention can effectively mitigate the phenomenon of ringforming in the kiln tail of the rotary kiln.

Titre : Rotary kiln for reducing phosphate ore in kiln procmethod for solving ring forming in kiln tail in kiln process for

Numéro de dépôt : 1201500482(PCT/CN13/081164)

Titula

SICH

Date de dépôt : 09/08/2013

Priorité(s) :

CN n° 201310218599.1 du 04/06/2013

Délivré le : 29/07/2016

Publié le : 28.04.2017

Inven

Mand

ess for production of phosphoric acid andproduction of phosphoric acid.