Method for preparing artificial rutile from titanium concentrate

Abstract

The invention relates to a method for preparing artificial rutile. The method comprises the following steps: ilmenite classification, oxidizing roasting, reduction roasting, fluoride salt staging acidleaching impurity removal, water washing and calcination for obtaining high-grade artificial rutile. The problems of high calcium and magnesium content and low grade of artificial rutile are solved through hydrochloric acid leaching of redox-modified ilmenite, and fluoride salt staging acid leaching impurity removal adopted in the acid leaching process of the method enhances the impurity removalcapability, especially the calcium impurity removal capability, of individually used hydrochloric acid, so the prepared artificial rutile has a high grade and a low calcium and magnesium content, andcan be directly used as a raw material for a chlorination process. The method has the advantages of simple process and device, convenience in operation, low cost, and easiness in realization of industrial production. The grade of the artificial rutile obtained by the method is 90% or more, the impurity removal effect is good, and the total content of calcium and magnesium is 0.5% or less. The rawmaterial used in the invention is ilmenite from Panzhihua and Xichang regions in Sichuan.

Description

technical field [0001] The invention relates to a method for preparing artificial rutile from titanium concentrate, which belongs to the field of chemical metallurgy. Background technique [0002] my country is rich in ilmenite resources, and the Sichuan Panxi area has 90% of my country's ilmenite, but the structure of ilmenite in this area is dense, and the titanium concentrate obtained has low titanium grade and high calcium and magnesium content. The existing ilmenite is smelted by electric furnace The method and reduction corrosion method to treat titanium concentrate can not effectively remove impurities such as calcium and magnesium in titanium concentrate, and the grade of titanium-rich material prepared at the same time is low, which is not suitable as a raw material for boiling chlorination. At present, ferrotitanium in Panxi area The ore is mainly used as the raw material of sulfuric acid titanium dioxide, while the production of chloride titanium dioxide mainly reli...

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Problems solved by technology

After the reduction roasting of this method, the roasted titanium concentrate needs to be subjected to magnetic separation to select the magnetic titanium concentrate. Although the impurity removal effect is good, the operation is relatively complicated.

CN101412536A Chinese patent document also discloses a method of artificial rutile, which is to firstly carry out high-temperature oxidation roasting of ilmenite, then reduction roasting, and then use hydrochloric acid for multiple contact removal of impurities, after drying and calcining, it can be obtained Artificial rutile products, the difference between this patented method and the method in No. CN101244841A is that oxidation and reduction roasting are all carried out in a fluidized bed in this patent, and acid leaching is repeated contact with hydrochloric acid to remove impurities. In addition, this method will further obtain high-grade Artificial rutile products need post-magnetic separation of calcined samples, or pre-magnetic separation of titanium concentrate after reduction and roasting. Although this method can be applied to both coarse and fine ilmenite, the operation also requires magnetic separation.

[0004] At present, ilmenite is used to prepare artificial rutile in China, which has high requirements for raw materials, relatively complicated operation, high pulverization rate of the product, or relatively high calcium content in the prepared artificial rutile products, which restricts industrial production.

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