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Rotary hearth furnace

A rotary hearth furnace and furnace cavity technology, which is applied in phosphate material processing, phosphorus oxyacid, phosphoric acid, etc., can solve the problems of high requirements, difficult realization, and difficult control of the ball-forming process, so as to ensure product quality and performance. The effect of reducing energy consumption and improving energy efficiency

Pending Publication Date: 2017-03-15
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • 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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  • Rotary hearth furnace

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Embodiment 1

[0065] Utilize the rotary hearth furnace of the embodiment of the present invention, prepare phosphoric acid as raw material with phosphate rock and semi-coke, concrete method is as follows:

[0066] 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 the rotary hearth furnace speed is controlled at 55min / r, t...

Embodiment 2

[0068] Utilize the rotary hearth furnace of the embodiment of the present invention, prepare phosphoric acid as raw material with phosphate rock and semi-coke, concrete method is as follows:

[0069] 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 4The gaseous substance with CO is sent to the upper furnace chamber t...

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Abstract

The invention discloses a rotary hearth furnace which comprises an annular shell, a rotatable annular hearth, a heat conduction plate, an air pipeline, a lower-layer furnace chamber gas outlet, an upper-layer furnace chamber gas inlet, an upper-layer furnace chamber air inlet and an upper-layer furnace chamber air outlet. Due to arrangement of the heat conduction plate of the rotary hearth furnace, a reduction reaction and an oxidation reaction can be specifically distinguished, so that the reduction reaction and the oxidation reaction can be successfully implemented respectively on premise that high-efficiency utilization of thermal energy is ensured and atmospheres needed in the reduction reaction and the oxidation reaction are ensured, and the product quality can be ensured. In addition, heat emitted from the oxidation reaction of an upper-layer furnace chamber is conducted to a lower-layer furnace chamber through the heat conduction plate, and is supplied to the reduction process of phosphorite, so that the energy consumption of the rotary hearth furnace can be remarkably reduced, and the energy utilization rate can be remarkably increased.

Description

technical field [0001] The present invention relates to rotary hearth furnaces. Background technique [0002] At present, the rotary hearth furnace is mainly used to reduce iron-containing materials, and there is no process for treating phosphate rock with a rotary hearth furnace to prepare phosphoric acid. [0003] At present, the main methods of producing phosphoric acid from phosphate rock in industrialization include 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 ...

Claims

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Application Information

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