System for fluidized oxidizing/reducing roasting modification of titaniferous iron concentrate and roasting process

Abstract

The invention discloses a system for fluidized oxidizing / reducing roasting modification of titaniferous iron concentrate and a roasting process. A fluidized bed oxidation reactor is adopted for the oxidizing roasting of titaniferous iron concentrate powder, and fluidized air is preheated by a hot blast heater and mineral powder is preheated by a multistage cyclone preheater so as to provide heat for oxidizing roasting; the oxidized mineral powder enters the fluidized bed reduction reactor for reducing roasting, and heat is provided for the reducing roasting through heating coal gas by a coal gas preheater; and latent heat of unreacted reducing gas in roasting tail gas of the reduction reactor is firstly released through combustion in a combustion chamber, one path of hot flue gas after the combustion is mixed with the tail gas of the oxidation reactor and then enters the multistage cyclone preheater to exchange heat with the cold titaniferous iron concentrate powder, heat is recycled while the titaniferous iron concentrate is preheated, and the other path of hot flue gas is used for preheating cold coal gas to warm the fluidized coal gas entering a reducing furnace so as to strengthen a reducing condition. The system has the advantages of high oxidizing / reducing efficiency, high heat utilization efficiency in a roasting process and the like.

Description

technical field [0001] The invention relates to chemical engineering and metallurgy technology, in particular to a modification and roasting process of an ilmenite concentrate fluidized oxidation-reduction roasting system. Background technique [0002] With the sustained and rapid development of my country's national economy, the demand for titanium resources continues to increase significantly. my country's Panzhihua-Xichang area contains extremely rich vanadium-titanium magnetite resources, which occur in multi-component vanadium-titanium magnetite symbiotic compact ore. Among them, titanium (as TiO 2 Total) reserves of 870 million tons, accounting for about 90% of the country, is the most important base of titanium raw materials in my country. [0003] Ilmenite concentrate is selected from iron-separation tailings. Although it has a dense structure, it has good acid solubility and is a high-quality raw material for the production of sulfuric acid titanium dioxide. However...

AI Technical Summary

Problems solved by technology

[0008] (1) The hot tail gas at the outlet of the oxidation furnace is directly discharged, resulting in low heat utilization efficiency;

[0009] (2) The tail gas circulation of this process is only applicable to pure H 2 As a reducing agent, if the gas contains an inert gas (such as N 2 ), the cycle will accumulate; if it contains CO, the reaction process will generate CO 2 , CO 2 Cannot be effectively removed by washing with water alone

However, pure hydrogen can only be used as a reducing agent, which will greatly limit the application of the process;

[0010] (3) The reducing fluidized bed adopts intermittent operation. In order to realize continuous operation, two intermediate silos are required, which not only complicates the system, but also limits the system capacity due to intermittent operation.

[0011] (4) The process does not specify what equipment the reduced ore uses to achieve isolated air cooling

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