Method for preparing mixed-crystal double-effect seed crystal for production of titanium dioxide by sulfuric acid method
A dual-effect seed crystal, titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve the problems of high cost, no industrialization, unstable quality, etc., to save steam and natural gas, and reduce market dependence. performance and cost savings
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Embodiment 1
[0026] Bleach metatitanic acid to Fe≤50ppm, beating, the beating concentration is 10%, add it to a four-neck flask, add sodium hydroxide with a purity of more than 94% according to the mass ratio of 5:1, heat up to boiling, keep boiling for 3 hours, and cool To below 50°C, filter, wash with desalted water at room temperature until the alkali content in the filtrate is ≤2g / L; beat the filter cake to a concentration of 50g / L, add 0.5 times HCl, heat up to 85°C, keep it warm for 60min, add the same volume of normal temperature desalination The water is rapidly cooled to below 50°C to obtain nano-scale seeds.
Embodiment 2
[0028] Bleach metatitanic acid to Fe≤50ppm, beating, beating concentration is 12%, add to four-necked flask, add potassium hydroxide with purity above 94% according to the mass ratio of 4:1, heat up to boiling, keep boiling for 3h, cool To below 50°C, filter, wash with desalted water at room temperature until the alkali content in the filtrate is ≤2g / L; beat the filter cake to a concentration of 100g / L, add 0.8 times HCl, heat up to 90°C, keep warm for 30min, add the same volume of normal temperature desalination The water is rapidly cooled to below 50°C to obtain nano-scale seeds.
Embodiment 3
[0030] Bleach metatitanic acid to Fe≤50ppm, beating, the beating concentration is 23%, add it to a four-neck flask, add sodium carbonate with a purity of more than 94% according to the mass ratio of 3:1, heat up to boiling, keep boiling for 3 hours, and cool to Below 50°C, filter, wash with desalted water at room temperature until the alkali content in the filtrate is ≤2g / L; beat the filter cake to a concentration of 200g / L, add 1.0 times HCl, heat up to 95°C, keep warm for 10min, add the same volume of desalted water at room temperature Rapid cooling to below 50°C yields nanoscale seeds.
[0031] Numbering
[0032] It can be seen from the analysis results in the above table that the obtained seed crystals are mixed crystal nanocrystals with a specific surface area of 175m 2 / g or more, particle size below 5nm.
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