Titanium rod has good physical and chemical properties, low density, light weight, non-magnetic, high strength, good corrosion resistance, it has good mechanical properties and welding performance, Baoji titanium rod is widely used in chemical equipment, seawater In desalination, ship parts, electroplating industry, etc., the corrosion resistance of titanium is 10 times that of ordinary stainless steel, and titanium metal is a metal with low human rejection, so the processed parts of medical titanium rods are widely used in human implantation and medical equipment. use. The reducing activity of various reducing agents to ilmenite decreases in the following order: charcoal>anthracite>petroleum coke>metallurgical coke. Charcoal has high activity and can make the charge have greater resistance, but it is expensive and should not be used. Petroleum coke has high carbon content and low ash content, but low activity and high price. It is not an ideal reducing agent and is only used in small-scale production of high-quality titanium slag. Production practice at home and abroad shows that anthracite is a suitable reducing agent for smelting high-titanium slag, its carbon content and activity are high, its price is low, and its source is reliable. ~340k0/cm3), but should choose anthracite with low ash, low volatile and low sulfur. Titanium rod 12 In principle, all carbon-containing materials such as coal, petroleum coke, metallurgical coke, charcoal and graphite powder can be used as reducing agents for smelting high titanium slag. Considering the rationality of process and economy, the reducing agent with high activity, low electrical conductivity, low ash content, low volatile content, low sulfur content and cheap should be selected. The high activity of the reducing agent can increase the reduction speed, reduce the smelting time, reduce the energy consumption and improve the production capacity. The conductivity of the reducing agent is low, which can improve the performance of the charge and ensure a reasonable power supply system. The ash content of the reducing agent is low, which can reduce its pollution to the product high-titanium slag. The volatile content of the reducing agent is low, which can reduce the exhaust gas in the smelting process and is beneficial to the stability of the furnace condition. As mentioned above, sulfur is a harmful impurity of smelting iron slag, and undoubtedly a low-sulfur reducing agent should be selected as much as possible.
Commonly used heat treatment methods are annealing, solution and aging treatment. Annealing is to eliminate internal stress, improve plasticity and organizational stability, and obtain better comprehensive properties. Usually, the annealing temperature of α alloy and (α+β) alloy is selected at 120-200℃ below the (α+β)-→β phase transformation point; solution and aging treatment is fast cooling from high temperature region to obtain martensite α′ phase and metastable Then, these metastable phases are decomposed by heat preservation in the medium temperature zone, and finely dispersed second phase particles such as α phase or compounds are obtained to achieve the purpose of strengthening the alloy. Usually (α+β) alloys are quenched at 40-100°C below the (α+β)─→β phase transition point, and metastable β alloys are quenched at 40～80°C above the (α+β)─→β phase transition point. The aging treatment temperature is generally 450 to 550 °C. In summary, the heat treatment process of titanium alloys can be summarized as: (1) Stress relief annealing: The purpose is to eliminate or reduce the residual stress generated during processing. Prevent chemical attack and reduce deformation in some corrosive environments. (2) Complete annealing: The purpose is to obtain good toughness, improve processing properties, facilitate reprocessing and improve the stability of size and structure. (3) Solution treatment and aging: The purpose is to improve its strength. Alpha titanium alloys and stable beta titanium alloys cannot undergo strengthening heat treatment, and only annealing is performed in production. α+β titanium alloys and metastable β titanium alloys containing a small amount of α phase can be further strengthened by solution treatment and aging. In addition, in order to meet the special requirements of the workpiece, the industry also adopts metal heat treatment processes such as double annealing, isothermal annealing, beta heat treatment, and deformation heat treatment.
Application of Industrial Pure Titanium in Chemical Industry
Titanium metal has excellent corrosion resistance and mechanical properties, and is widely used in many departments. Especially in chemical applications, titanium can replace stainless steel as a corrosion-resistant material, which is of great significance in extending the service life of equipment, reducing costs, preventing pollution and improving productivity. In recent years, the scope of titanium used in chemical industry in my country has been expanding, and the amount of titanium has increased year by year. Titanium has become one of the main anti-corrosion materials in chemical equipment. As a corrosion-resistant structural material used in chemical equipment, titanium has become an ideal material in chemical equipment. Chlor-alkali industry The chlor-alkali industry is an important basic raw material industry, and its production and development have a great impact on the national economy. This is because titanium has better corrosion resistance to chloride ions than commonly used stainless steel and other non-ferrous metals. At present, titanium is widely used in the chlor-alkali industry to manufacture metal anode electrolyzers, ionic membrane electrolyzers, wet chlorine coolers, refined brine preheaters, dechlorination towers, and chlorine gas cooling and scrubbing towers. In the past, the main parts of these equipments were mostly made of non-metallic materials (such as graphite, polyvinyl chloride, etc.). Due to the unsatisfactory mechanical properties, thermal stability performance and processing performance of non-metallic materials, the equipment was bulky, energy-consuming and short-lived. , and affect product quality and pollute the environment. Therefore, since the 1970s, my country has begun to replace graphite cells with metal anode cells and ion membrane cells, and replaced graphite coolers with titanium wet chlorine coolers, all of which have achieved good results. For example: the application of titanium wet chlorine cooler. The production of caustic soda by salt electrolysis is to generate a large amount of high-temperature wet chlorine gas. In the production of chlorine gas produced by electrolysis of salt in my country, the output and quality of chlorine gas were affected by the unreasonable cooling process or the corrosion of cooling equipment, and it also seriously polluted the environment. Titanium coolers resistant to high temperature and wet chlorine corrosion were put into production, which changed the production outlook of chlorine production in the chlor-alkali industry. Titanium is extremely resistant to corrosion in the environment of high temperature and wet chlorine gas. The corrosion rate of titanium in chlorine water at room temperature is 0.000565mm/a; in chlorine water at 80 °C, the corrosion rate of titanium is 0.00431mm/a; In wet chlorine gas, the corrosion rate of titanium at room temperature is 0.00096mm/a. Titanium wet chlorine coolers are often used in many chlor-alkalis, and some have been used for nearly 20 years and are still in good condition.