There are some significant disadvantages in the neutralization method in the production of ammonium metatungstate. The following is a detailed summary and point-by-point representation:
Large acid consumption
When producing ammonium metatungstate, the neutralization method needs to add a large amount of nitric acid for acidification. This leads to higher production costs, because the purchase, storage and use of nitric acid require additional costs. At the same time, due to the strong volatility of nitric acid, there may be safety hazards during use, which increases the pressure on environmental protection and safety management.
Environmental issues
The use and discharge of nitric acid may cause serious environmental pollution problems. For example, wastewater may contain high concentrations of nitrates and heavy metal ions. If they are discharged directly without treatment, they will have a serious impact on the water environment.
Waste gas emissions may also contain harmful gases such as nitrogen oxides, which pose a threat to air quality.
Product purity and particle size control are difficult
During the production process of the neutralization method, product purity and particle size are difficult to control. This may lead to unstable product quality and affect the performance and use of the final product. Especially for products neutralized at room temperature, the particle size is fine, not easy to filter and wash, and it is easy to corrode equipment, which increases the difficulty and cost of production.
Long production cycle
Evaporation crystallization is another commonly used production method. Although it has the problems of high energy consumption, product purity and crystallization rate affecting each other, its production cycle is relatively short. The neutralization method may require a longer production cycle, which reduces production efficiency.
Technical limitations
The technology of the neutralization method is relatively traditional, and there may be some technical limitations, such as the selection of solid-liquid ratio and the control of solution clarity, which may affect the quality and production efficiency of the product.
In summary, although the neutralization method in the production of ammonium metatungstate has the advantages of simple process and easy implementation, it has obvious disadvantages in environmental protection, cost, product purity and particle size control. Therefore, in practical applications, it is necessary to comprehensively consider various factors and select a suitable production process.
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