Titanium Mixer Selection Guide| 7 types of propellers +5 key parameters + pit avoidance

Published by Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd on 2026-07-23

The equipment supervisor of a chlor-alkali enterprise in Shandong Province encountered corrosion problems, The original 316L stainless steel agitator was used to treat the medium containing 3000ppm chloride ion sodium hypochlorite, Pitting and perforation occurred in only 3 months, Material leakage causes material scrap.changetitanium stirrerAfter that, the equipment operated stably for two years without corrosion.When the chloride ion content of the medium is greater than 2000ppm, concomitant oxidation, crevice environment, 316 stainless steel is prone to pitting and perforation.Titanium material can repair itself in the passivation film containing oxychloride environment, metal ions are not easy to precipitate, the self-weight of that shaft body is light, Procurement costs are only one-third to one-fifth of those of Hastelloy, Widely used in chlor-alkali, hydrometallurgy, Pharmaceutical chemical reaction kettle.

titanium stirrerIt is divided into three installation forms: vertical jacking, side entry and bottom entry.Vertical jacking is the mainstream scheme of chemical reaction kettle, Equipment assembled vertically from top of kettle, Easy maintenance, reliable sealing performance, But the cantilever shaft needs to check the critical speedSide-entry type from the side wall of the kettle access, suitable for large volume shallow liquid storage tank, shortcomings shaft seal position radial jump control difficulty;Bottom-in type installed at the bottom of the kettle, sealing conditions are good, but the bearing maintenance in the kettle is inconvenient, and it is mostly used for high clean conditions of medicine and food.

Seven types of propellers can be selected according to medium viscosity and process objectives.Propelling type is suitable for homogeneous mixing and liquid-liquid mixing conditions with low and medium viscosity;The inclined blade turbine takes into account both shearing and circulation, and is suitable for gas-liquid dispersion and solid-liquid suspension;Straight-blade turbine mainly uses high-shear dispersion emulsion;Anchor type, frame type suitable for high viscosity materials, blades close to the kettle wall to enhance heat transfer, prevent material deposition;Screw belt type for ultra-high viscosity pseudoplastic materials;Multi-layer combined impellers can be used for multiphase complex reactions.The ratio of propeller diameter to kettle diameter needs to be controlled when selecting type., Anchor frame blades as close as possible to the inner wall of the kettle body, turbine, The reasonable ratio is selected according to the technology.

chlor-alkali, Hydrometallurgical lithium cobalt nickel extraction, medical intermediate, sea water desalination, desulfurization waste water, New energy cathode pastes are alltitanium stirrerTypical application scenarios.In terms of material configuration, TA2 is preferred for stirring shaft and blade under normal working conditions;There is a risk of crevice corrosion from strong reducing acids. Upgrade TA10;TA9 sleeve can be used for local sealing dead zone.Mechanical seals must use silicon carbide, Tungsten carbide grinding pair with titanium alloy sleeve, Do not directly match 316 stainless steel sleeve, Avoid galvanic corrosion in chlorine-containing media.

Five key parameters need to be checked for type selection, Calculate shaft diameter based on torque, aspect ratio of control shaft, Check the first order critical speed, The working speed is controlled within 70% of the critical speedControl shaft seal position runout, Control tip deflection, Stepped shaft transition fillet R≥ 5mm, Avoid stress concentration caused by sharp keyways.Mechanical seals account for a relatively high proportion of the cost of the whole machine, atmospheric conditions select a single end;0.3‑1.0MPa, granular medium shall be double-end integrated type;Vacuum, toxic medium can be configured dry gas seal.

Market prices are influenced by shaft diameter, impeller type, Sealing configuration impact, Quotes are mostly for mixing body bare metal, reduction box, Motors need to be accounted for separately.Four types of risks need to be avoided in manufacturing, Titanium material has low elastic modulus, Long thin shaft turning is easy to chatter, Adopt rigid tooling followerSpecial titanium welding wire is used for blade welding, argon protection is used in the whole process, and stress relief is carried out after welding;Perform dynamic balance according to working conditions, conventional G6.3, high speed increased to G2.5;Do a good job of step shaft fillet treatment, eliminate sharp keyway, avoid galvanic corrosion risk.Purchasing needs to check the quality assurance of materials, and spectrum verification marks if necessary.

Manufacturers rooted in Baoji China Titanium Valley can provide a variety of installation forms, blade typestitanium stirrerCustomized, engineers can combine kettle parameters, medium, viscosity, speed to give a selection reference.titanium barBrand selection and machining technologyFull Analysis of Titanium Reactor Structure SelectionTitanium Heat Exchanger Selection Guide

frequently asked questions

Q: What working conditions are recommended for selectiontitanium stirrer？ Medium chloride ion greater than 2000ppm, In an oxidizing crevice environment, 316 stainless steel is easy to pitting and perforation, such as chloralkali, Wet lithium cobalt nickel extraction and other scenarios, preferredtitanium stirrer。

Q: How to choose different installation methods? A: Most chemical reactors use vertical jacking;Large volume shallow liquid storage tank is selected as side entry;Medicine food high clean demand selects bottom enters the type.

Q: Why can't we use 316 stainless steel sleeve? Galvanic Corrosion of Titanium and Stainless Steel in Chlorine-Containing Electrolyte Environment, accelerates component corrosion and contaminates materials, Titanium alloy or non-metallic bushings must be selected.

disclaimer

This article selection ideas, Price range is based on industry project experience, For technical reference only, Not as engineering design, Direct basis for purchasing contract.Mixing equipment selection and design shall be evaluated by qualified engineers and technicians in combination with site conditions and current national standards.