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Here, NaOH or NH3 · H2O is used as a precipitant or pH regulator to react with FeSO4 to form ferrous hydroxide precipitation; Air is used as oxidant; The iron sheet reacts with sulfuric acid produced during the oxidative hydrolysis of FeSO4 to provide ferrous ions required in the reaction system and maintain the pH value of the solution. The alkali consumption of acid method is less and the particles are easy to wash. The relative rates of seed preparation and crystal growth determine the particle size, particle size distribution and particle morphology of iron yellow particles.

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Moreover, China's commitment to reducing overall greenhouse gas emissions, as outlined in its ambitious Paris Agreement pledge, has led to stricter environmental regulations for the TiO2 industry. These measures include tightened emission standards, increased penalties for non-compliance, and incentives for cleaner production technologies These measures include tightened emission standards, increased penalties for non-compliance, and incentives for cleaner production technologies These measures include tightened emission standards, increased penalties for non-compliance, and incentives for cleaner production technologies These measures include tightened emission standards, increased penalties for non-compliance, and incentives for cleaner production technologieschina dioxide titanium.

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