Method for preparing rutile from acid-soluble titanium slag
AssigneeYunnan Minzu University
InventorsGuo Chen, Jin Chen, Jinhui Peng, Libo Zhang, Shenghui Guo, Junwen Zhou
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Abstract
Provided is a method for preparing rutile from acid-soluble titanium slag, including: grinding acid-soluble titanium slag; adding a sodium carbonate modifier, and performing microwave irradiation treatment in a microwave device; adding an ammonium bifluoride additive; and performing acid purification and calcination to obtain rutile. By means of a microwave heating mode, the equipment investment needed by the method is low, and the energy consumption is low. The purity of artificial rutile is more than 91%, byproducts are fewer, and the environmental pollution is low.
Claims13
A method for preparing rutile from an acid-soluble titanium slag, comprising steps of:
- (i) grinding including:
- grinding the acid-soluble titanium slag using a grinding device so that 80 wt % or more of the slag has a particle size of −100 mesh, thereby obtaining an acid-soluble titanium slag powder;
- then
- (ii) modifying including:
- adding sodium carbonate as a modifier to the acid-soluble titanium slag powder obtained in step (i) in an amount of 20-40 wt % based on a weight of the acid-soluble titanium slag powder, mixing uniformly, and then radiating the mixture at a temperature of 750-850° C. in a microwave device, thereby obtaining a modified acid-soluble titanium slag,
- wherein the radiating is performed at a frequency of 912-918 MHz for 1.5-2.5 hours;
- then
- (iii) adding an additive including:
- grinding the modified acid-soluble titanium slag obtained in step (ii) so that 80 wt % or more of the slag has a particle size of −160 mesh, and adding ammonium bifluoride as an additive thereto, thereby obtaining an additive-containing acid-soluble titanium slag;
- and
- (iv) removing impurities in an acid environment and calcining including:
- uniformly mixing the additive-containing acid-soluble titanium slag obtained in step (iii) with a sulfuric acid or hydrochloric acid aqueous solution having a concentration of 15-30 wt % at a solid-liquid ratio of 1:4-6, removing impurities from the additive-containing acid-soluble titanium slag for 90-120 min at a boiling temperature, filtering, washing and drying the boiled slag, and then calcining at a temperature of 900-1000° C. to obtain the rutile.
A method for preparing rutile from an acid-soluble titanium slag, comprising steps of:
- (i) grinding including:
- grinding the acid-soluble titanium slag using a grinding device so that 80 wt % or more of the slag has a particle size of −100 mesh, thereby obtaining an acid-soluble titanium slag powder;
- then
- (ii) modifying including:
- adding sodium hydroxide or a phosphate as a modifier to the acid-soluble titanium slag powder obtained in step (i) in an amount of 20-40 wt % based on a weight of the acid-soluble titanium slag powder, mixing uniformly, and then radiating the mixture at a temperature of 750-850° C. in a microwave device, thereby obtaining a modified acid-soluble titanium slag,
- wherein the radiating is performed at a frequency of 912-918 MHz for 1.5-2.5 hours;
- then
- (iii) adding an additive including:
- grinding the modified acid-soluble titanium slag obtained in step (ii) so that 80 wt % or more of the slag has a particle size of −160 mesh, and adding ammonium bifluoride as an additive thereto, thereby obtaining an additive-containing acid-soluble titanium slag;
- and
- (iv) removing impurities in an acid environment and calcining including:
- uniformly mixing the additive-containing acid-soluble titanium slag obtained in step (iii) with a sulfuric acid or hydrochloric acid aqueous solution having a concentration of 15-30 wt % at a solid-liquid ratio of 1:4-6, removing impurities from the additive-containing acid-soluble titanium slag for 90-120 min at a boiling temperature, filtering, washing and drying the boiled slag and then calcining at a temperature of 900-1000° C. to obtain the rutile.
Dependencies are inferred from the claim text.