Cradle to Consumer
Identity ID
35b8ea79-bdb5-451a-982a-bfe221fe0ed4
Materials
Associated ID
7e373adb-ae40-4222-9f61-6705a9c2a775
Included activities starts
Included activities ends
Description
This dataset is a market dataset representing the consumption market of the region. The dataset includes the transport of the product from the gate to the consumption end, and the transport service is calculated based on the transport situation of the product in the region. The product represented by this dataset is ammonium paratungstate (APT), an inorganic compound product prepared from tungsten concentrate through a hydrometallurgical process. Its appearance is fine transparent monoclinic crystals or white crystals, with a relative density of 2.3, easily soluble in water and insoluble in ethanol, and its aqueous solution is weakly acidic; ammonium paratungstate has a high tungsten content and good thermal decomposition properties. Under heating conditions, it can decompose to generate tungsten trioxide, and metallic tungsten can be further prepared through a reduction process. This product has high purity and low impurity content, and is the core key raw material for preparing various tungsten-based products such as tungsten powder and tungsten carbide, occupying a core hub position in the tungsten smelting and tungsten deep-processing industry chain. The upstream raw material of this product is tungsten concentrate, and downstream it is widely used in tungsten powder preparation, cemented carbide production, tungsten-based functional material processing, metallurgical additives and other tungsten industry deep-processing fields, making it an important chemical intermediate that connects the upstream and downstream of the tungsten metallurgy industry chain. The dataset includes the main raw and auxiliary materials, energy and waste of the production process, while infrastructure such as production equipment manufacturing and plant construction is not included within the dataset boundary; the data inventory is formed by merging data from multiple sources.
Activity Description
Ammonium paratungstate (APT) is prepared using tungsten-cobalt alloy waste and tungsten concentrate as the main raw materials, using advanced energy-saving and environmentally friendly hydrometallurgical processes. The production process includes raw material pretreatment, roasting, ball milling, alkali boiling and decomposition, filtration and washing, ion exchange purification and evaporation crystallization.
Process Description
Ammonium paratungstate is an inorganic compound with the appearance of monoclinic fine transparent crystals or white crystals. Relative density 2.3. Soluble in water, insoluble in ethanol. The aqueous solution is slightly acidic. APT has a high tungsten content and good thermal decomposition characteristics. When heated, it can decompose to form tungsten trioxide, which can then be reduced to obtain metallic tungsten. Therefore, it is a key raw material for the preparation of tungsten powder, tungsten carbide and other tungsten products. It has high purity and few impurities, and occupies a core position in the tungsten smelting and deep processing industry chain.
Time period
2021
2026
Geography
China,Tianjin
Geography comment
Generated by merging multiple data sets in this geographical location.
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
Ammonium paratungstate (APT) is prepared using tungsten-cobalt alloy waste and tungsten concentrate as the main raw materials, using advanced energy-saving and environmentally friendly hydrometallurgical processes. The production process includes raw material pretreatment, roasting, ball milling, alkali boiling and decomposition, filtration and washing, ion exchange purification and evaporation crystallization. First, the crushed raw materials are sent to an electric shuttle furnace and roasted at 825 to 850°C for about 3 hours to convert tungsten into tungsten trioxide. After the roasted material is refined to more than -320 mesh by wet ball milling, it is decomposed by alkali boiling with sodium hydroxide solution to generate a soluble sodium tungstate solution. After plate and frame press filtration and multi-stage washing, the filtrate is combined to form a high-concentration sodium tungstate solution (pre-exchange solution). Subsequently, sodium tungstate is converted into a high-purity ammonium tungstate solution through the anion exchange process in the steps of adsorption, washing, desorption and column washing. Finally, after removing molybdenum and purifying the ammonium tungstate solution, it is sent to the crystallization pot for evaporation and crystallization by steam heating to obtain high-purity ammonium paratungstate (APT) product.