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Green production of titanium dioxide(2)

Green production of titanium dioxide(2)

  • Categories:Applications
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  • Time of issue:2023-08-26
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(Summary description)

Green production of titanium dioxide(2)

(Summary description)

  • Categories:Applications
  • Author:
  • Origin:
  • Time of issue:2023-08-26
  • Views:0
Information

The first is the green production technology of titanium dioxide.

    The production process of sulfuric acid to produce pigment titanium dioxide produces a large amount of gas with sulfuric acid, solid residue, waste sulfuric acid, and a large amount of ferrous sulfate. Inorganic contaminants of soluble iron compounds, dilute acids and other ores have become international environmental concerns. The production process of chlorination to prepare pigment titanium dioxide produces a large number of highly corrosive, highly toxic chlorine-containing gases and solid chlorine-containing inorganic salts.

    Over the years, many technologies and green methods have been used to reduce emissions of exhaust gases, liquid waste and solids, and to recover useful substances or waste dioxide production by-products from the resource utilization. In some cases, process waste heat is recovered into the production process, helping to reduce the amount of combustion gas or coal used and, therefore, CO2 emissions. The green production technology of sulfuric acid titanium dioxide mainly includes continuous acid lysis technology, slag mixed acid lysis technology, acid hydrolysis process control technology, high-efficiency hydrolysis technology, waste acid concentration technology, calcined tail gas treatment and waste heat recovery technology, chlorinated titanium dioxide green production technology mainly includes chlorine inventory control and three waste treatment technology. Treatment and benefits of various technologies.

The second is the comprehensive utilization of by-products. In addition to the main product titanium dioxide, some by-products will be produced in the production process of titanium dioxide, such as ferrous sulfate (green alum), red gypsum, etc. in the production of titanium dioxide by sulfuric acid method. The comprehensive utilization mode of sulfuric acid by-products is shown in Figure 3-1. Green alum separation is the most environmentally friendly iron removal method for the production of titanium dioxide by sulfuric acid, green alum can be sold in the market as chemical raw materials, can also be used to prepare sulfuric acid, iron oxide pigments, used as water purification agents. The low concentration of spent acid produced in the production of titanium dioxide by sulfuric acid is neutralized with lime to produce red gypsum. The main component of red gypsum is CaSO4· H2O, which also contains Fe(OH)3, Al(OH)3 and other impurities. Red gypsum can be used in cement, building materials, subgrade materials, soil modifiers, etc. Vanadium residue removal in the chlorination process can be used to extract vanadium feedstock.

 

 

The world's titanium dioxide pigment production methods include sulfuric acid method and chlorination method. The two processes are very different in terms of chemical reaction processes and raw material use. In North America, titanium dioxide pigments are mainly produced by chlorination, but in Europe and Asia, titanium dioxide pigments are mainly produced by sulfuric acid. Through continuous technological innovation, chlorination and sulfuric acid have reached high environmental requirements in Europe and the United States.

    It is now recognized that there is little difference in the environmental impact between modern sulfuric acid processes and modern chlorination processes.

    Looking forward to the future, the key technology of titanium dioxide green production will be more widely used and implemented in the production process of titanium dioxide in China. The effective utilization of titanium dioxide production by-products can not only reduce the impact of these by-products on the environment, but also improve the overall economic effect of titanium dioxide green production.

Modern membrane technologies (including ultrafiltration, reverse osmosis, membrane filtration) and ion exchange separation can be used to selectively filter concentrated solutions to produce purified filtrate streams and concentrated solutions. These types of processes can be used to both clean and recycle wastewater. The widespread use of energy-saving technologies such as high-efficiency concentration and waste heat recovery technology will reduce the fuel consumption of titanium dioxide production and reduce the emission of greenhouse gas CO2 in the atmosphere.

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