Method for processing titanium extraction slag and carbon extracted and dechlorinated tailing

A method for processing titanium extraction slag, wherein the method comprising a carbon extraction and dechlorination process, wherein the carbon extraction and dechlorination process comprising following steps:

• grinding the titanium extraction slag raw material to obtain a treated material with a particle size of 0.3˜120μm and d90≤90 μm;
• mixing a first solvent and the treated material with a liquid-to-solid ratio of 3.5˜4.5:1 L/kg, additionally adding a first capturing agent and a first foaming agent to mix, and then performing a primary flotation to obtain a floating product and a sinking product;
• filtering the sinking product to obtain a first filtrate, returning the first filtrate to be used as the first solvent, after multiple cycles of the first filtrate evaporation, concentration and crystallization, to obtain a chloride powder;
• adding a second solvent to the floating product to adjust the liquid-to-solid ratio to 4˜5:1 L/kg, additionally adding a second capturing agent and a second foaming agent to mix, and then performing a secondary flotation to obtain a foam product and a bottom tank product;
• filtering and drying the bottom tank product to obtain a filter residue and a second filtrate, and returning the second filtrate to be used as the second solvent after multiple cycles of the second filtrate evaporation, concentration and crystallization, to obtain the chloride powder;
• filtering and drying the foamed product to obtain a refined carbon, and filtering and drying the sinking product to obtain a carbon extraction and dechlorination tailing;
• wherein, the d90≤90 μm means that more than 90% of the powder in the treated material has a particle size of less than or equal to 90 μm;
• the titanium extraction slag is a secondary industrial waste slag obtained from titanium-containing blast furnace slag after undergoing a process of high-temperature carbonization and low-temperature selective chlorination to extract titanium, the titanium extraction slag contains 5˜10% carbon and 2˜5% chlorine;
• the carbon extraction and dechlorination tailing includes 30˜32% CaO, 27˜28% SiO2, 13˜15% Al2O3, 12˜14% TiO2, 7˜8% MgO, 2˜2.5% Fe2O3, 0.34˜2.1% C, 0.04˜0.06% Cl by mass fraction;
• the ignition loss of the carbon extraction and dechlorination tailing is 0.4˜2.5%, the crystalline phase is titanium carbide, and the crystallinity is 10˜12%;
• the carbon extraction and dechlorination tailing can be directly used as building materials;
• the refined carbon is graphite-like carbon, the ignition loss thereof is 46˜60%, and the chlorine content thereof is 0.02˜0.03%;
• a removal rate of carbon in the titanium extraction slag is 50˜90%, and a removal rate of chlorine is 97˜98.5%;
• and
• both of the primary flotation and the secondary flotation are realized by a flotation machine,
• and wherein during the primary flotation, the stirring rate of the flotation machine is 1300˜1500 r/min, the aeration amount is 0.3˜0.35 m3/min, and the flotation time is 2˜4 min;
• during the secondary flotation, the stirring rate of the flotation machine is 1500 to 1800 r/min, an aeration amount is 0.3 to 0.35 m3/min, and a flotation time is 6 to 9 min;
• the amount of the first capturing agent is 0.5˜2.5 kg/t titanium extraction slag, the amount of the first foaming agent is 0.5˜2.5 kg/t titanium extraction slag, the amount of the second capturing agent is 0.5˜1.0 kg/t titanium extraction slag, and the amount of the second foaming agent is 0.5˜1.0 kg/t titanium extraction slag.