Vanadium pentoxide recovery process

Is an oxide of vanadium pentoxide, and more alkaline than acidic, soluble in alkali to generate vanadate, dissolved in a strong acid or a vanadyl ion, VO VO3 +. Orange or brick red solid. Odorless, odorless, and toxic. Slightly soluble in water to form a light yellow acidic solution. Vanadium pentoxide can be obtained by thermal decomposition of ammonium metavanadate or vanadium oxychloride with water.

2NH4VO3 V2O5+2NH3+H2O

2VOCl3+3HO2 V2O5+6HCl

Vanadium pentoxide is the most widely used product of vanadium oxide. In the exploration, production and international trade of vanadium resources, vanadium pentoxide is generally used as the calculation unit.

Production of metal vanadium pentoxide, vanadium iron alloy, and other intermediate products vanadium-based alloy, but also a raw material for the vanadium catalyst, can also be used benzoic acid, phthalic acid catalyst in organic synthesis, but also for the manufacture of Stained glass and ceramics.

Vanadium pentoxide recovery process:

(1) Recovery from vanadium slag: Vanadium slag is a vanadium-containing raw material with high vanadium content, and the recovery technology is relatively mature. At present, the general process is the sodium roasting process. The equipment used is different. Large enterprises generally use rotary kiln, while some enterprises use roaster. The process consists of mixing vanadium slag with sodium salt (usually sodium carbonate or thenardite ), calcining at a certain temperature to convert vanadium into soluble sodium salt, and then leaching the calcined salt to make vanadate into solution. Filtration, filtration of the waste residue, and then through precipitation, exquisite and other processes to obtain vanadium pentoxide. Some foreign enterprises directly use vanadium- titanium magnetite containing vanadium to produce vanadium pentoxide. First, the ore is made into concentrate, then mixed with flux, and then roasted in rotary kiln, blasted with water, and ammonium with vanadium solution. Salt treatment, and finally precipitate ammonium metavanadate.

(2) recovering from the stone coal: Stone Coal vanadium process is predominantly sodium roasting process, roasting Na - flooding - Hydrolysis vanadium precipitation - soluble alkali salts vanadium precipitation - Thermal deamination - fine vanadium Process flow. This process is a commonly used process for extracting vanadium from stone coal in China. It is characterized by simple process and full utilization of the thermal energy of stone coal. The disadvantage is that the recovery rate is low, generally below 60%. The United States adopts the above process, but adopts dilute sulfuric acid leaching and solvent extraction technology, and the recovery rate can reach 70%.

(3) Recycling from petroleum waste catalysts: The United States, Japan and other countries have been recovering vanadium from petroleum vanadium-containing spent catalysts since the 1970s. The technology is mature and there are many processing technologies. Many processes have been patented. The internationally accepted technology is sodium roasting: batching→baking→grinding→leaching filtration→vanadium→calcination→vanadium pentoxide product↓solution→extraction and recovery of molybdenum →ammonium molybdate product 渣 slag→further recovery of nickel →metal nickel.

Although the economic and technical parameters in the recycling process of different countries are different, but basically refer to the above process, the process adopted by enterprises in China to recover vanadium from waste catalysts in the petroleum industry is basically the same.

(4) Recycling from waste catalysts in sulfuric acid industry: The recovery of vanadium pentoxide from waste catalysts in the sulfuric acid industry has already attracted the attention of all countries in the world. The former Soviet Union started earlier here and the technology is relatively mature. There are also many patent reports in Japan and the United States. The recovery of vanadium in the waste vanadium catalyst of China's sulfuric acid industry was carried out earlier. In the 1980s, Nanhua Company, Chengdu Institute of Technology, Beijing Mining Institute, Zhenjiang Smelter, and Pingdingshan 987 Chemical Plant all carried out a large number of experiments. The Pingdingshan 987 chemical plant has been put into production. The technologies currently used include fire-wet combined process and full wet process, the latter being widely used. The process is as follows: spent catalyst → crushing → hydrochloric acid leaching → filtration → adding sodium hydroxide hydrolysis → vanadium precipitation → refining → calcination → product. The wet process is simple in process, low in investment, and the total recovery rate is above 90%. The disadvantage is that the amount of waste liquid produced is large and cannot be balanced. At present, China's enterprises that recover vanadium pentoxide from the waste vanadium catalyst of sulfuric acid industry use the above process, and the fire method is not used.

Conclusion: The process of extracting vanadium from vanadium-containing materials includes fire, wet and fire, and wet combined processes. The most mature technologies are: sodium roasting, leaching, and vanadium precipitation, which are also classics of vanadium extraction technology. The recovery of vanadium pentoxide from the waste vanadium catalyst of the sulfuric acid industry generally employs an acidic direct leaching process.

Solid-liquid Separator for animal manure  

Usage---- Solid Liquid Separator

This animal manure solid liquid separator used to reduce the water content of animal dung, acid-sludge, medicine dregs, kitchen rubbish, and many other dregs.


Description ---- solid liquid separator 

1.The development of modern livestock farming, the rise of intensification and factory farming industry has enriched people's material needs. However, it also brought the flooding of livestock sewage which caused the water, air and environment pollution.

2.This animal manure solid liquid separator will separate the original livestock manure to liquid and solid organic fertilizer: the liquid organic fertilizer can be directly used for crops; the solid organic fertilizer can be shipped to regions that lack of fertilizer to improve the soil structure. What's more, after fermentation, the solid organic fertilizer can be made into organic compound fertilizer.

Solid-liquid Separator

Solid-liquid Separator,Low Energy Consumption,Solid Liquid Separator,Separation of Animal Droppings

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