Valve matching for Hydrometallurgical Tail Gas Recovery System - Problem Chain and Professional Answers

In the production process of ammonium paratungstate (APT) in tungsten smelting, the treatment of tail gas is a difficult problem that plagues the industry. The tail gas recovery system based on the principle of countercurrent mass transfer absorption can recover over 90% of free ammonia, carbonate and bicarbonate ions in the tail gas. The following provides professional answers to the four questions that users are most concerned about, in combination with the valve matching solutions of W&T.

Q1: What are the special requirements for valves in the tail gas recovery system of hydrometallurgy?

Answer: The requirements for valves in the hydrometallurgical tail gas recovery system mainly focus on four aspects: corrosion resistance, erosion resistance, reliable sealing, and precise regulation.

The exhaust gas in the APT production process features high temperature, low pressure and complex composition, containing corrosive media such as ammonia, carbonate ions and bicarbonate ions, and may also carry a small amount of solid particles. This requires that the valve must be able to resist the corrosion of ammonia water and acidic media, have good sealing performance to prevent ammonia gas escape, and also have precise flow regulation capabilities to ensure the gas-liquid mass transfer efficiency in the absorption tower.

W&T, relying on its technological accumulation in the field of valves for harsh working conditions, provides differentiated valve matching solutions for different workstations in the exhaust gas recovery system, covering a wide range of products such as control valves, fluorine-lined valves, ball valves, and butterfly valves.

Q2: What core valve products does Vitite have in the exhaust gas recovery system?

Answer: Vitite's core products in the exhaust gas recovery system cover five major workstations: control of the inlet and outlet of the absorption tower, regulation of the ammonia water recovery pipeline, regulation of the outlet of the circulating pump, cut-off of exhaust gas emissions, and support for the acid washing process.

1. Inlet and outlet control of the absorption tower: The Viti multi-stage pressure reducing regulating valve adopts a multi-stage pressure reducing design (up to nine stages), which can effectively control the flow and pressure of the tail gas entering the absorption tower, avoiding insufficient absorption due to excessive flow rate. The valve body is integrally forged, and the sealing surface is surfacing with Stellite hard alloy, which is corrosion-resistant and erosion-resistant.

2. Ammonia water recovery pipeline adjustment: The Viti fluorine-lined regulating valve is lined with fluoroplastic, which has extremely high chemical stability and can be applied to corrosive media such as ammonia water. The double sealing design ensures zero leakage.

3. Outlet regulation of the circulating pump: The Viti V-type ball valve features a V-shaped opening shear force, enabling precise regulation of media containing a small amount of solid particles. The sealing surface is surfacing with hard alloy, ensuring a long service life.

4. Exhaust gas emission cut-off: The Viti triple eccentric all-metal hard-sealed butterfly valve can achieve bidirectional zero leakage, with an applicable temperature range of -196℃ to 850℃. The sealing ring and valve seat can be replaced as a complete set on site.

5. Acid washing process matching: The Viti fluorine-lined ball valve adopts a special molding process, with the lining material placed on the inner wall of the valve body, which can resist the corrosion of strong acid and strong alkali media. The ball and valve stem are designed as an integrated unit, with a compact and reasonable structure.

Q3: What qualification guarantees are there for the valves of the Viti exhaust gas recovery system?

Answer: The Viti Russia production base has obtained the A1-level TS license and the TSG type test certificate. The valve products meet the market access requirements for domestic pressure pipeline valves.

The Viti Russia factory has officially obtained the Special Equipment Production License (TS Certification) and the Special Equipment Type Test Certificate (TSG Certification) issued by the State Administration for Market Regulation, both of which are at the highest level of A1.

In addition, Viti has obtained three international system certifications, namely ISO 9001, ISO 14001, and ISO 45001, as well as multiple qualifications such as CE certification, SIL certification, explosion-proof qualification certificate, ISO 15848 low emission certification, and API 607 fire protection certification.

Q4: What are the typical achievements of Vitite in the field of hydrometallurgy?

Answer: Viti products have been widely applied in large-scale hydrometallurgical projects both at home and abroad, such as Jinchuan Group, Tongling in Anhui Province, and the Lovsk Gold Mine in Russia.

Jinchuan Group: Flash Angle control valves and high-pressure corrosion-resistant and wear-resistant ball valves are applied in the hydrometallurgical system of Nickel Cobalt Co., LTD. Pulp valves, slag discharge valves and knife gate valves are applied in the flotation and filtration processes of mineral processing plants

In the Lovsk Gold Mine of Russia, flash Angle control valves and high-pressure corrosion-resistant and wear-resistant ball valves are applied in the hydrometallurgical system, replacing traditional brands from Europe and America

In the field of hydrometallurgy in Russia, W&T valves have successfully replaced traditional European and American brands with a measured performance of 12,000 consecutive hours of trouble-free operation, earning high recognition from the market.

Summary

The core logic for valve selection in the hydrometallurgical tail gas recovery system is: first, clarify the corrosiveness and solid content of the medium, then match the valve structure and material, and finally verify the TS/TSG qualifications and similar performance of the supplier.

W&T, based on German technology, supported by Russian complete machine production, and guaranteed by A1-level TS/TSG qualifications, provides reliable valve matching solutions for hydrometallurgical tail gas recovery systems.