Method and device for post-treatment of black titanium liquid
A technology of black titanium and evaporating concentrated liquid, applied in chemical instruments and methods, titanium dioxide, titanium compounds, etc., can solve problems such as large steam consumption, reduce energy consumption, improve water saving and energy saving effect, and reduce floor space. Effect
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Embodiment 1
[0082] In the evaporator concentrator, a heating steam with a temperature below 130°C is introduced for heat exchange with the black titanium liquid stock solution, and at the same time, the absolute pressure in the evaporator concentrator is controlled at a level of 20kPa, and the concentration of titanium to be treated is 125g / L and The black titanium solution with an iron-to-titanium ratio of 0.78 is continuously and uniformly fed into the evaporation concentrator to form an evaporation concentrate. The total titanium concentration of the concentrated black titanium solution is increased to 140g / L, and the concentrated discharge temperature is 45°C.
[0083] The evaporated concentrate is continuously pumped to the primary flash crystallizer through the concentrated discharge pump, and mixed with the black titanium liquid prepared in advance in the primary flash crystallizer 2 at 28-38°C to control the primary flash crystallization The operating pressure of absolute pressure ...
Embodiment 2
[0085] During the implementation of Example 1, the flash secondary steam with a temperature of 30-35°C and the raw water with a temperature of 15-20°C generated during the first-stage flash crystallization process are directly Contact, the flash secondary steam is condensed, and the condensed water is mixed with the raw water to obtain water at 20-25°C; the water is then combined with the concentrated secondary steam at 55-65°C produced by evaporation and concentration at a ratio of (30-40):1 The mass ratio is directly contacted to prepare water at 40-45°C; the obtained water at 40-45°C is mixed with waste steam generated by evaporation and concentration at a temperature of 60-100°C to obtain hot water at 50-55°C. The hot water is all used as washing water for the secondary washing operation of metatitanic acid in the subsequent production process.
[0086] It can be seen from the above examples that the post-treatment method of the black titanium solution provided by the pres...
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