A kind of phosphate rock decarburization calcining method

A phosphate rock and calcination technology, which is applied in the decarbonization and calcination field of phosphate rock, can solve the problems of no energy saving and consumption reduction, low heat recovery rate of high-temperature flue gas and high-temperature phosphate rock clinker, backward equipment and heat exchange methods, etc., and achieve high Effect of Phosphorus Recovery

Active Publication Date: 2016-03-09
成都建筑材料工业设计研究院有限公司
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  • Summary
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Problems solved by technology

However, at present, the traditional method of producing yellow phosphorus either does not carry out pre-calcination, or even if there is pre-calcination, it is relatively backward in terms of equipment and heat exchange methods, and the heat recovery rate for high-temperature flue gas and high-temperature phosphate rock clinker is low, and there is no Realize the best conditions for saving energy and reducing consumption

Method used

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  • A kind of phosphate rock decarburization calcining method
  • A kind of phosphate rock decarburization calcining method
  • A kind of phosphate rock decarburization calcining method

Examples

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Embodiment 1

[0039] Such as figure 1 As shown, the solid line with arrows in the figure indicates the material flow, and the dotted line with arrows indicates dusty gas or gas-solid mixture. A decarbonization and calcination device for phosphate rock, including a flue gas heat recovery and phosphate rock powder preheating section, a phosphate rock powder fluidized calcination decomposition section, and a phosphate rock clinker cooling and heat recovery section connected in sequence, flue gas heat recovery and phosphorus The mineral powder preheating section is composed of connected three-stage gas-solid separators, the fluidized calcination and decomposition section of phosphate rock powder is a fluidized calciner, and the phosphate rock clinker cooling and heat recovery section is composed of connected low-speed convective heat exchangers It is composed of a first-stage gas-solid separator.

[0040] 1. High temperature flue gas heat recovery and phosphate rock powder preheating section: ...

Embodiment 2

[0050] Such as figure 2 As shown, this embodiment is basically the same as Embodiment 1, the difference being that the flue gas heat recovery and phosphate rock powder preheating section is composed of a first-stage gas-solid separator. At this time, the phosphate rock powder raw material does not undergo flue gas heat recovery and The phosphate rock powder is preheated in the preheating section, and is directly put into the fluidized calciner 7 for pre-calcination, but the heat of the high-temperature phosphate rock clinker after calcination is recovered through cooling of the phosphate rock clinker and heat recovery.

Embodiment 3

[0052] Such as image 3 As shown, this embodiment is basically the same as Embodiment 1, and the difference is that the flue gas heat recovery and phosphate rock powder preheating section is composed of two-stage gas-solid separators, and the phosphate rock powder raw material is only passed through flue gas heat recovery and rock phosphate powder preheating section. Preheating of primary suspension downstream heat exchange in the preheating section of phosphate rock powder.

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Abstract

The invention discloses a phosphate rock decarbonization and calcination device, which belongs to the field of phosphate rock decarbonization and calcination, and includes a flue gas heat recovery, a phosphate rock powder preheating section, a phosphate rock powder fluidized calcination decomposition section and a phosphate rock clinker connected in sequence Cooling and heat recovery section, the flue gas heat recovery and phosphate rock powder preheating section includes at least three-stage gas-solid separators connected to each other, the phosphate rock powder fluidized calcination decomposition section is a material dispersion fluidized calcination device, The phosphate rock clinker cooling and heat recovery section includes a connected air cooling device and at least one gas-solid separator; the present invention has a high carbonate decomposition rate, which can greatly improve the phosphorus recovery rate of subsequent processes, And significantly realize the phosphate rock pre-calcination device that saves energy and reduces consumption.

Description

technical field [0001] The invention belongs to the field of decarburization and calcination of phosphate rock. Background technique [0002] The grade of phosphate rock in our country is low. Except for a few rich ores that can be used directly, most of them need to be processed to be used. Phosphate rock is a non-renewable resource. The washing and utilization of low-grade phosphate rock resources, especially the pre-calcination of low-grade phosphate rock is an effective measure to improve the phosphorus recovery rate of yellow phosphorus production, save energy and reduce consumption. The reaction of carbonate in phosphate rock is an endothermic reaction, and the presence of a large amount of carbonate will cause the temperature in the calcined yellow phosphorus furnace to drop. At the same time, the CO released after the decomposition of carbonate 2 The reaction with phosphorus steam to form low-valent oxides of phosphorus will cause loss of phosphorus and reduce the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27B15/00F27B15/02F27B15/10F27B15/16
Inventor 蔡顺华高敏刘建文柏鸣陈军磊
Owner 成都建筑材料工业设计研究院有限公司
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