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System for processing phosphorite and application thereof

A phosphate rock and furnace cavity technology, applied in the direction of phosphate material processing, phosphoric acid, phosphorus oxyacid, etc., can solve the problems of difficult realization, high requirements for pelletizing process, and difficult control, so as to save operating costs and guarantee products. The effect of quality and saving equipment investment

Pending Publication Date: 2017-03-22
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with electric furnace phosphoric acid, the energy consumption of kiln phosphoric acid is greatly reduced, but there are still the following problems: 1. There is the problem of kiln ring formation; 2. It is difficult to separate the oxidation zone and reduction zone in the kiln, which affects the reduction reaction and oxidation reaction effect , which ultimately affects the recovery rate of phosphorus and product quality; 3. High requirements on the pelletizing process
Because the oxidation reaction and the reduction reaction are carried out in the same equipment, the surface of the material pellets needs to be covered with a coating layer. This pelletizing process is very difficult to control during the production process and is not easy to realize.

Method used

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  • System for processing phosphorite and application thereof
  • System for processing phosphorite and application thereof
  • System for processing phosphorite and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0105] Utilize the system for processing phosphate rock of the embodiment of the present invention to process phosphate rock to prepare phosphoric acid, and the process of processing is as follows Figure 5 As shown, the specific steps are as follows:

[0106] Mix the phosphate rock that is ground to 200 mesh and account for more than 50% with semi-coke, silica and binder according to a certain ratio, and use a disc pelletizer to make pellets, of which P 2 o 5 The grade is 21.5%, the amount of semi-coke added is 1 times of the theoretical requirement, the amount of silica added is 12% of the weight of phosphate rock, the binder is selected from sodium-based raw materials and bentonite, and then the grate is used at 100-200°C. Dry the prepared carbon-containing pellets until the moisture content is less than 2%. The dried carbon-containing pellets are placed in the lower chamber of the rotary hearth furnace for preheating and reduction. The reduction temperature is 1300°C, and...

Embodiment 2

[0108] Utilize the system for processing phosphate rock of the embodiment of the present invention to process phosphate rock to prepare phosphoric acid, and the process of processing is as follows Figure 5 As shown, the specific steps are as follows:

[0109] Mix the phosphate rock crushed to -2mm and account for more than 75% with lignite, silica and binder according to a certain proportion and press the ball with a ball press machine, where P 2 o 5 The grade is 28%, the addition amount of lignite is 1.3 times of the theoretical requirement, the addition amount of silica is 2% of the weight of phosphate rock, the binder is liquid binder, and the pressed pellets are dried until the water content is ~4%. The lower chamber of the rotary hearth furnace is preheated and reduced, the reduction temperature is 1380°C, the rotation speed of the rotary hearth furnace is controlled at 65min / r, and the included angle of the ring of the reduction chamber is 270°C. P-containing 4 The g...

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Abstract

The invention discloses a system for processing phosphorite and an application thereof. The system for processing phosphorite comprises a material mixing device, a ball making device, a drying device, a rotary hearth furnace and a hydration device. The rotary hearth furnace in the system for processing phosphorite is adopted to conduct oxidation and reduction treatment on pelletizing containing materials of phosphorite and the like; meanwhile, by adding a heat transferring plate in a hearth of the furnace, the furnace separates the reduction of phosphorite from the oxidation reaction of phosphorite, wherein the reduction reaction of phosphorite is finished in the lower furnace chamber of the rotary hearth furnace, the oxidation reaction of phosphorous vapour is finished in the upper furnace chamber of the rotary hearth furnace, and heat released in the oxidation is transferred to materials laid in the bottom furnace through the heat transferring plate so as to be used as a main heat source for the majority of heat necessary to heat absorption process of the reduction reaction. According to the system for processing phosphorite and application thereof, a reduction reaction area is separated from an oxidation reaction area, and thus product quality is guaranteed; meanwhile, the reduction reaction and the oxidation reaction of phosphorite are finished in the same rotary hearth furnace of one equipment, therefore heat released from the oxidation and reduction treatment is effectively made use of, and operating cost and equipment investment are saved.

Description

technical field [0001] The present invention relates to a system for processing phosphate rock, and a method for processing phosphate rock using the aforementioned system for processing phosphate rock. Background technique [0002] At present, the main methods of industrial production of phosphoric acid are thermal phosphoric acid, wet phosphoric acid and kiln phosphoric acid. Among them, the production method of thermal phosphoric acid is generally used at home and abroad as the electric furnace two-step method. This method is to dedust the sublimated phosphorus obtained by reducing the phosphate rock in the electric furnace to cool the phosphorus into a liquid state, and then burn the liquid phosphorus through combustion and water. Phosphoric acid is produced by chemicalization and demisting. The main equipment of this method is an electric furnace. During the production process, the electric furnace converts electric energy into heat energy in the form of raw material re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18C01B25/20C01B25/01
CPCC01B25/18C01B25/01C01B25/20
Inventor 王静静宋文臣李红科曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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