Environment-friendly heavy lanthanum flint optical glass, preparation method thereof and optical element

The invention provides environment-friendly heavy lanthanum flint optical glass, a preparation method thereof and an optical element. The environment-friendly heavy lanthanum flint optical glass comprises the following components in terms of compounds: 6.5-10% of SiO2; 20 to 27 percent of B2O3; 4 to 14 percent of La2O3; 11 to 17% of TiO2; 15 to 20 percent of Nb2O5; zrO2: 3 to 6 percent; 1 to 6 percent of CaO; 10 to 18 percent of BaO; 2 to 5 percent of Na2O; the total weight of the components is greater than 99%; the percentage is weight percentage. According to the environment-friendly heavy lanthanum flint optical glass, the internal transmittance in the visible light range is high enough, the internal transmittance is larger than or equal to 99.6% when the wavelength is 700 nm, and the internal transmittance is larger than or equal to 60% when the wavelength is 400 nm. 本发明提供一种环保重镧火石光学玻璃及其制备方法和光学元件。所述环保重镧火石光学玻璃包括以化合物计的以下组分：SiO2：6.5～10％；B2O3：20～27％；La2O3：4～14％；TiO2：11～17％；Nb2O5：15～20％；ZrO2：3～6％；CaO：1～6％；BaO：1