Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Rotary hearth furnace

A technology of rotary hearth furnace and annular furnace, which is applied in the direction of phosphoric acid, phosphorus oxyacid, and phosphate material treatment. The effect of reducing power consumption and improving energy efficiency

Pending Publication Date: 2017-05-24
JIANGSU PROVINCE METALLURGICAL DESIGN INST
View PDF4 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rotary hearth furnace
  • Rotary hearth furnace
  • Rotary hearth furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The rotary hearth furnace of the embodiment of the present invention is used to process phosphate rock to prepare phosphoric acid. The specific method is as follows: the phosphate rock that is ground to 200 mesh and accounts for more than 60% is mixed evenly with semi-coke, silica and binder according to a certain proportion, and made with a disc. Ball machine pelletizing, where P 2 o 5 The grade is 22%, the amount of semi-coke added is 1.1 times of the theoretical requirement, the amount of silica added is 11% 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 The prepared carbon-containing pellets are dried until the water content is less than 1%. The dried carbon-containing pellets are placed in a rotary hearth furnace for preheating and reduction. The reaction section of the rotary hearth furnace maintains a reducing atmosphere. The reduction temperature is 1300°C. The spe...

Embodiment 2

[0063] Utilize the rotary hearth furnace of the embodiment of the present invention to process phosphate rock to prepare phosphoric acid. The specific method is as follows: mix the phosphate rock crushed to -2mm and account for more than 90% with lignite, silica and binder according to a certain proportion and press the ball with a briquetting machine. , where P 2 o 5 The grade is 28%, the amount of lignite added is 1.3 times of the theoretical requirement, the amount of silica added is 3% of the weight of phosphate rock, the binder is liquid binder, and the pressed pellets are dried to a moisture content of ~4% and then placed into The rotary hearth furnace is preheated and reduced, and the atmosphere in the reaction section is controlled to be a reducing atmosphere. The reduction temperature is 1300°C, the rotation speed of the rotary hearth furnace is controlled at 60min / r, and the angle between the rings in the reaction section is 290°C. P-containing 4 The gaseous substa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a rotary hearth furnace which comprises an annular furnace body, a rotatable annular hearth, a plurality of nozzles and a plurality of radiation tubes, wherein the annular hearth is arranged on the lower portion of the annular furnace body, located between the inner side wall and the outer side wall and sequentially divided by partitions in the rotating direction of the annular hearth into a feeding section, a reaction section and a discharging section. The feeding section is provided with a feeding component, the reaction section is provided with a flue outlet, and the discharging section is provided with a discharging component. The plurality of nozzles are arranged on the reaction section along the circumference. The plurality of radiation tubes are arranged on the reaction section along the circumference. By arrangement of the radiation tubes, reduction reaction and oxidation reaction are divided clearly, and the reduction reaction and the oxidation reaction are performed smoothly respectively on the premise of guarantee efficient utilization of heat energy and atmospheres required for the reduction reaction and the oxidation reaction respectively.

Description

technical field [0001] The present invention relates to rotary hearth furnaces. Background technique [0002] Existing rotary hearth furnaces are mainly used to process iron-containing materials, and there is no process for using rotary hearth furnaces to process phosphate rock to prepare phosphoric acid. [0003] At present, the main methods of industrial production of phosphoric acid are thermal phosphoric acid, wet phosphoric acid and kiln phosphoric acid. 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 remove the dust from the sublimated phosphorus obtained by reducing the phosphate rock in the electric furnace, and then cool the phosphorus into a liquid state, and then burn the liquid phosphorus through combustion, hydration, Defog is made into phosphoric acid. The main equipment of this method is an electric furnace. During the production process, the electric furnace con...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/18C01B25/01
CPCC01B25/18C01B25/01
Inventor 王静静李红科宋文臣曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com