solution having a concentration of 21 wt were uniformly mixed at a solid liquid ratio of 1 4 5 to obtain a mixture and then impurities were removed from the additive containing titanium slag at a boiling temperature for 105 min using a constant temperature water bath sold by gongyi city yuhua instrument co ltd under a trade name of constant temperature heating magnetic stirrer df 101s the mixture was filtered using a filter device sold by mettler toledo instruments inc under a trade name of circulating water vacuum pump shz d iii to obtain a solid the solid was then washed three times using water at a liquid solid ratio of 4 1 the solid was then dried at a temperature of 100 u00b0 c for 1 5 hours in a drying device sold by shanghai boxun industrial equipment co ltd under a trade name of digital display drying oven dzx 9030mbe the solid was then calcined at a temperature of 960 u00b0 c for 2 5 hours to obtain a product the product was identified through x ray diffraction as artificial rutile containing 92 3 wt of tio 2 0 25 wt of cao and 0 86 wt of mgo an acid soluble titanium slag obtained from yuntong group titanium industry co ltd was identified by a method described in the present specification to find a chemical composition of the slag including 72 0 wt of tio 2 9 0 wt of sio 2 1 3 wt of mgo and 0 3 wt of.