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Another approach utilizes titrimetry, where a standard solution of a titrant, such as lead perchlorate or barium perchlorate, is used to react with the sulfate ions. The endpoint of the titration is determined either by a color change indicator or more sophisticated instrumentation like a potentiometric titrator The endpoint of the titration is determined either by a color change indicator or more sophisticated instrumentation like a potentiometric titrator The endpoint of the titration is determined either by a color change indicator or more sophisticated instrumentation like a potentiometric titrator The endpoint of the titration is determined either by a color change indicator or more sophisticated instrumentation like a potentiometric titratordetermination of sulphate as tio2. The volume of titrant used corresponds to the concentration of sulfate in the sample. Again, a stoichiometric calculation converts this to TiO2 content.

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 Fourth, since the sulfate required for the production of the present invention is provided by the acid leaching slag itself, the mass fraction of the SO/- contained in the acid leaching slag is 15% or more, and the nanometer is prepared by using the acid leaching residue as the zinc and sulfate raw material of the lithopone. Lide powder products not only realize the resource utilization of acid leaching slag, but also turn waste into treasure, and treat and improve the acidic soil of acid leaching residue to purify the environment. Low production costs and simple operation. The metathesis reaction is carried out in a low-density ammonia system (the metathesis reactant is dissolved in recovered ammonia water), and the crystal nucleus formed is smaller. It is non-toxic and safe. The ammonia solution after synthesis and separation is returned to the leaching. There is no waste water in the whole production process. The produced waste residue meets the national solid waste discharge standard for efflux, conforms to the national industrial policy, and is an environmentally friendly “green” type process.

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