The production process of ammonium metatungstate neutralization method mainly includes the following steps. I will explain it in detail in the form of point representation and summary, combined with the relevant figures and information in the article:
- Raw material preparation
Main raw materials
Ammonium paratungstate (APT) and nitric acid.
Liquid preparation
Ammonium paratungstate is mixed with deionized water in a certain proportion to make an ammonium paratungstate solution of a certain concentration. In this step, the solubility of ammonium paratungstate is small, so the selection of solid-liquid ratio is the key. Generally, the smaller the solid-liquid ratio, the easier it is for ammonium paratungstate to dissolve and convert, but too small a solid-liquid ratio may lead to a decrease in equipment utilization.
- Nitric acid addition and neutralization reaction
Nitric acid addition
Nitric acid is added to the ammonium paratungstate solution to start the neutralization reaction. The amount of nitric acid added is usually determined according to the amount of ammonium paratungstate and the required pH value.
pH value control
The pH value of the reaction solution is controlled between 3 and 4 by adding nitric acid or other acid solutions. The control of pH value is the key to the neutralization reaction, which directly affects the conversion rate of the reaction and the purity of the product.
Temperature and stirring
During the reaction, it is necessary to control the appropriate temperature (such as 95℃) and stirring speed (such as 80 r/min) to promote the reaction and ensure the uniformity of the reaction solution.
- Crystallization and separation
Crystallization
As the reaction proceeds, ammonium metatungstate begins to crystallize. In this step, the crystallization effect can be optimized by controlling conditions such as temperature and stirring speed.
Separation
The crystallized solution is filtered or centrifuged to obtain ammonium metatungstate crystals and mother liquor.
- Drying and packaging
Drying
The separated ammonium metatungstate crystals are dried to remove excess water. The drying temperature and time should be adjusted according to product requirements.
Packaging
The dried ammonium metatungstate crystals are packaged, usually in a plastic inner and iron outer barrel, with a net weight of 50 kg or 25 kg per barrel.
- Environmental protection and safety
Wastewater treatment
Treat the wastewater generated during the production process to ensure that it meets environmental protection requirements.
Waste gas treatment
The waste gas generated is collected and treated to reduce the emission of harmful gases such as nitrogen oxides.
Safety measures
Ensure the safe operation of the equipment and prevent the leakage of dangerous goods such as nitric acid and the occurrence of safety accidents.
The production process of ammonium metatungstate neutralization method mainly includes raw material preparation, nitric acid addition and neutralization reaction, crystallization and separation, drying and packaging, environmental protection and safety. Among them, pH control, temperature and stirring adjustment are the key control points in the production process. By optimizing these control points, high-quality ammonium metatungstate products can be produced efficiently and stably. At the same time, pay attention to the implementation of environmental protection and safety measures to ensure the sustainability and safety of the production process.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
