生物质烘干钛精矿对其酸解性能的影响

Effect of biomass drying titanium concentrate on its acid hydrolysis performance

针对生物质烘干钛精矿时出现酸解性能下降现象,通过对比不同烘干方式钛精矿酸解性能差异,查找了其对酸解性能的影响,并开展了酸解性能提升探索试验。试验结果表明:生物质直接烘干的钛精矿中混入生物质及其燃烧残渣后,其相对煤气直接烘干的钛精矿,酸解性能中酸解率及钛液抽速下降,且混入量越大,酸解率及钛液抽速下降越大;当生物质直接烘干的钛精矿C含量为煤气直接烘干钛精矿C含量的4倍时,在反应酸矿比增加0.02,反应酸浓度增加2%,熟化温度增加10℃,熟化时间增加1 h的条件下,其酸解率93.00%大于煤气直接烘干钛精矿酸解率90.91%,但其钛液100 mL抽速615 s低于煤气直接烘干钛精矿钛液100 mL抽速122 s,且随着酸解率的提升,钛液抽速降低,通过将生物质直接烘干的钛精矿与煤气直接烘干的钛精矿按照质量比5:95混合后进行酸解,其酸解率、钛液抽速与煤气直接烘干钛精矿的酸解率、钛液抽速基本一致。

In view of the decline of acid hydrolysis performance of titanium concentrate directly dried by biomass, the influence of different drying methods on acid hydrolysis performance of titanium concentrate were found by comparing the difference of acid hydrolysis performance of titanium concentrate, and the exploration test of improving acid hydrolysis performance was carried out. The results show that after a small amount of biomass fuel and its combustion residues mixed into the titanium concentrate directly dried by biomass fuel, the acid hydrolysis rate and the filtration rate of titanium liquid in the titanium concentrate are lower than that of the titanium concentrate directly dried by coal gas. The larger the mixed amount, the greater the drop in the acid hydrolysis rate and the filtration rate of titanium liquid. When the C content of direct-drying titanium concentrate with biomass is 4 times that of the direct-drying titanium concentrate with coal gas and keep the conditions of reaction acid-ore ratio increasing 0.02, reaction acid concentration increasing 2%, ripening temperature increasing 10 °C and ripening time increasing 1 h, the acid hydrolysis rate of titanium concentrate dried by biomass fuel is93.00%, which is higher than 90.91% of titanium concentrate dried by coal gas. But the extraction rate of 100 mL titanium liquid is 615 s lower than 122 s of the latter. With the increase of acid hydrolysis rate, the pumping speed of titanium liquid decreases. The titanium concentrate directly dried by biomass fuel and coal gas are mixed according to the mass ratio of 5:95, the acid hydrolysis rate of titanium concentrate and the filtration rate of titanium liquid are almost the same as those of gas-drying titanium concentrate.