Fluidized oxidation roasting-fluidized reduction roasting system and roasting process for titaniferous iron concentrate

Abstract

The invention discloses a fluidized oxidation roasting-fluidized reduction roasting system and roasting process for titaniferous iron concentrate. The fluidized oxidation roasting-fluidized reduction roasting process for the titaniferous iron concentrate comprises the following steps of: performing oxidation roasting on titaniferous iron concentrate powder by adopting a fluidized bed oxidation reactor; enabling the oxidized powder to enter a fluidized bed reduction reactor and performing reduction roasting; cooling the reduced powder through a fluidized bed cooler; firstly burning tail gas exhausted from the fluidized bed reduction reactor in a combustion chamber so as to release the latent heat of unreacted reduction gas in the tail gas; mixing gas after burning with tail gas exhausted from the fluidized bed oxidation reactor; and then, entering a multi-stage cyclone preheater to exchange heat with the titaniferous iron concentrate powder to recover heat. The fluidized oxidation roasting-fluidized reduction roasting system for the titaniferous iron concentrate, disclosed by the invention has the advantages that the reaction efficiency is high; the heat can be fully utilized; the roasting process is good in economic efficiency and is suitable for large-scale continuous industrial production.

Description

technical field [0001] The invention relates to chemical industry and metallurgy technology, in particular to an ilmenite concentrate fluidized oxidation roasting-fluidized reduction roasting system and roasting process. Background technique [0002] With the increase in the production of titanium dioxide and titanium sponge by the chlorination method, the demand for high-quality titanium-rich materials required by the chlorination method has increased significantly at home and abroad. There are very few natural high-quality titanium ore (rutile ore) in nature, which is difficult to meet the demand. Therefore, it is necessary to upgrade the low-grade ilmenite to prepare high-quality titanium slag or artificial rutile. Ilmenite in nature is divided into placer and rock ore, among which rock ore is rich in reserves. For example, the reserves of vanadium-titanium magnetite resources in Panzhihua-Xichang area (Panxi area) in my country are nearly 10 billion tons, of which Titani...

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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 reduction 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

[0012] The above-mentioned shortcomings of the existing ilmenite concentrate oxidation roasting-reduction roasting process have seriously limited the development of the development and utilization of ilmenite concentrate, and there is an urgent need for an efficient oxidation roasting and reduction roasting process for ilmenite concentrate and fully utilize the energy of the roasting process. systems and processes

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