High-temperature reduced calcine cooling protection waste heat recycling system and method

Abstract

The invention discloses a reduced calcine cooling protection waste heat recycling system and method. The system comprises a first-stage fluidized bed heat exchanger and a second-stage fluidized bed heat exchanger which communicate in sequence and communicate with a nitrogen pipe network through a nitrogen pressurization fan, the first-stage fluidized bed heat exchanger and the second-stage fluidized bed heat exchanger sequentially communicate with a first-stage dust remover, a second-stage dust remover and a third-stage heat exchanger, the third-stage heat exchanger communicates with the first-stage fluidized bed heat exchanger and the second-stage fluidized bed heat exchanger through the nitrogen pressurization fan, an oxygen analyzer is arranged on a pipeline between the third-stage heatexchanger and the nitrogen pressurization fan the three-stage heat exchanger communicates with a boiler deaerator, a discharge outlet of the second-stage fluidized bed heat exchanger communicates with a feed inlet of a fluidized bed preheater through a material sealing valve, and the material sealing valve and an air inlet of the fluidized bed preheater communicate with an air outlet of an air pressurization fan. The problems that high-temperature reduced calcine calcination concentrate quality is poor and calcination energy consumption is high are solved, and the system can be widely appliedto mineral resources such as high-temperature powdered iron ore and manganese ore which are prone to oxidizing reaction after being subjected to reducing calcination.

Description

technical field [0001] The invention belongs to the technical field of waste heat recovery in the mining and metallurgical industry, and relates to a high-temperature reduction calcine cooling protection waste heat recovery system; the invention also relates to a method for utilizing the system to recover high-temperature reduction calcine cooling protection waste heat. Background technique [0002] my country is rich in complex refractory iron oxide ore resources, which have complex mineral composition, weak magnetism, and fine particle size. It is difficult to obtain ideal separation indicators by conventional strong magnetic separation technology. If such ores are subjected to reduction roasting pretreatment, and then undergo magnetic separation, reverse flotation and other processes, better separation indicators can often be obtained. [0003] The reduction roasting of ore refers to heating the ore (hematite, limonite, siderite and ferromanganese ore, etc.) magnetite. ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of poor roasted concentrate quality and high roasting energy consumption existing in the existing high-temperature reduced calcined sand cooling device, and to provide a high-temperature reduced calcined sand cooling protection waste heat recovery system

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