Acid extraction of vanadium pentoxide

First, the process

Ore crushing→ball milling→acid leaching→solid-liquid separation→pretreatment→extraction and extraction of vanadium →red vanadium pyrolysis→vanadium pentoxide.

The stone coal vanadium ore is crushed and wet-ball milled to a particle size of -60 mesh, accounting for more than 80%, and then continuously stirred with sulfuric acid, which accounts for 15% of the ore mass. The temperature is 85 ° C, the liquid solid product mass ratio (0.85 to 1): 1, vanadium is four. The valence form is transferred to the solution. After solid-liquid separation, stacking slag, after pretreatment solution to P 204 + TBP + sulphonated coal oil as extraction agent, the half-box 7 countercurrent extraction, and then 1 ~ 1. 5mol / L sulfuric acid was back-extracted with 5, A vanadium-containing solution having a mass concentration of 80 to 120 g/L is obtained, and red vanadium (ammonium polyvanadate) is obtained by heating and oxidation precipitation, and red vanadium is heated and decomposed at 550 ° C to obtain vanadium pentoxide.

Second, the process principle and application

Vanadium Vanadium stone coal ore portion of the territory of the Shan County substituted six coordinated mica isomorphous to form trivalent aluminum present in the crystal lattice mica mica formula {K (Al, V) 2 [AlSi 3 O 10 ](OH) 2 }, if vanadium is leached from the mica, the mica structure must be destroyed, so this part of the vanadium is difficult to leach. The mica structure is directly destroyed by acid, that is, under a certain temperature and acidity, hydrogen ions are introduced into the mica lattice to replace A1 3+ , and the ionic radius is changed to release vanadium. Vanadium is oxidized to tetravalent and then dissolved with acid. The reaction formula is:

(V 2 O 3 )·x+2H 2 SO 4 +1/2O 2 →

V 2 O 2 (SO 4 ) 2 +4H 2 O+x,

V 2 O 2 (OH) 4 +2H 2 SO 4 →

V 2 O 2 (SO 4 ) 2 +4H 2 O,

The result is a blue vanadium sulphate solution which is subjected to subsequent treatment to obtain a vanadium pentoxide product.

The process has been widely used in more than 10 vanadium processing plants in Shanyang County, Shaanxi Province, with a total yield of 65% to 71% and a production cost of 5.5 to 68,000 yuan/t. Waste from Fe 2+, Fe 3+, A1 3+ and other metal ions by oxidation, precipitation, filtration, clarification removed, ammonia nitrogen by adjusting the pH, heating, stripping can remove 90% waste can be recycled; No harmful gases are produced during the production process and there is no pollution to the atmosphere.

Tube Mill/Pipe Mill Line

The steel tube has a section and its length is much longer than the diameter or circumference of the steel. According to the shape of the section, it is divided into circular, square, rectangular, and special-shaped steel tubes. According to the material, it is divided into carbon structural steel tube, low alloy structural steel tube, alloy steel tube, and composite steel tube. According to the purpose, it can be divided into pipes for conveying pipeline, engineering structure; thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc. According to the production process is divided into a seamless steel tube and welded steel tube, a seamless steel tube is divided into hot railing and cold rolling (pull) two kinds, a welded steel tube is divided into a straight welded steel tube and spiral welded steel tube.

Tube mill/pipe mill line from HEBEI SENUF TRADE CO.,LTD adopts mature, reliable, completed, economical and advanced process with advanced equipment to ensure the tube pipe mill to reach a relatively advanced level not only in quality and cost but also consumption so that the products have strong competitive power in quality and price.

The composition of the tube mill for sale is from Decoiler, Cutting head, tail, Strip Steel head-tail butt welding, looping storage, Forming, High-frequency induction welding, Removing external burr, Cooling, Sizing, Cutting, roll table and bench, Checking & Collecting, to Binding and Accessing Warehouse.

Rolling speed of our tube mill/pipe mill machine can be adjusted correspondingly within a suitable range of pipe diameter and wall thickness.

HEBEI SENUF TRADE CO.,LTD is a professional tube mill machine manufacturer and exporter of all kinds of standard and non-standard tube mill/pipe mill line. We can provide: Tube Mill Line.Direct Square Tube Mill Line.High Frequency ERW Pipe Mill for Sale.Big Size Tube Mill Line.Large Diameter Spiral Pipe Mill.Stainless Steel Tube Mill Line.API Pipe Mill For Oil Transportation etc. Welcome both national and international customers to contact us for more information.

Pipe Making Roll Forming Machine,Tube Mill Line,Spiral Tube Mill Line,Pipe Mill Line