Coating knowledge: energy saving achievements of titanium dioxide industry in recent years

Core tip: as we all know, the technological process of sulfuric acid titanium dioxide is very long, and its natural energy consumption is also very much However, as a fine chemical product, the total output of titanium dioxide at home and abroad is not much, which is not very noticeable In fact, in terms of energy consumption per ton of product, it is far more than the unit consumption of steel, cement and other products that we are familiar with The total output of these products is tens of millions of tons, or even hundreds of millions of tons The total amount of energy consumption sounds really scary When using different raw material routes to produce titanium dioxide (including the energy consumption during the enrichment of raw materials), the energy consumption is quite different Table 2 shows the energy consumption when using four different raw material routes to produce titanium dioxide Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings news: as we all know, sulfuric acid titanium dioxide process is very long, naturally it also has a lot of energy consumption, but as a fine chemical product, titanium dioxide, whether domestic or foreign total output is not much, not much attention In fact, in terms of energy consumption per ton of product, it is far more than the unit consumption of steel, cement and other products that we are familiar with The total output of these products is tens of millions of tons, or even hundreds of millions of tons The total amount of energy consumption sounds really scary When using different raw material routes to produce titanium dioxide (including the energy consumption during the enrichment of raw materials), the energy consumption is quite different Table 2 shows the energy consumption comparison when using four different raw material routes to produce titanium dioxide The energy consumption of surface treatment is not included in the above four different process routes For titanium dioxide with surface treatment process, 83 ~ 120kmj / T TiO2 needs to be added according to different surface treatment processes Titanium dioxide production consumes a lot of energy, which naturally accounts for a large proportion of the production cost Generally, energy consumption accounts for 20% - 25% of the production cost Therefore, energy conservation and energy consumption reduction are important measures to reduce production cost, improve economic efficiency and sustainable development After the reform and opening up, China's titanium dioxide production has continued to grow at a high speed, while many achievements have been made in energy saving and consumption reduction Here's an example: In the past, 4R or 5R Raymond mill was used to crush ilmenite After 1990s, the experience of imported projects was used for reference Most of the enterprises with a capacity of over 15000 T / a were replaced by wind swept mill Compared with the traditional Raymond mill, wind swept mill has the advantages of large output, less maintenance and easy control, and the power consumption per ton of ore powder can be reduced by 5 ~ 10kwh At present, the crystallization of FeSO4 in domestic factories of ten thousand tons or more has almost changed from freezing crystallization to vacuum crystallization In recent years, many factories have changed from the original single-stage ejector water ring vacuum pump system to the two-stage ejector water ring vacuum pump system With the same power of vacuum pump, the steam consumption can be reduced by 15%, and the circulating water quantity can be reduced accordingly When a single-stage injection system is used in a domestic plant, the steam consumption of each batch of titanium liquid crystallized is 2330kg When the two-stage injection system is used, the water ring vacuum pump is also 22KW, only 1900kg steam is needed for each crystallization of titanium liquid 3 the concentration of titanium hydrolysate in the process of seed micro pressure hydrolysis has basically replaced that in the process of seed micro pressure hydrolysis, which requires 230g / L, and the production is difficult to control; the concentration of titanium hydrolysate in the process of seed micro pressure hydrolysis only needs 195-200g / L, and the total production cost is still lower than that in the process of seed micro pressure hydrolysis Due to the reduction of titanium concentration, the heating area of the concentrator is correspondingly reduced, and the power consumption and circulating water consumption are correspondingly reduced 4 Application of diaphragm plate and frame filter press the diaphragm plate and frame filter press has replaced most of the vacuum leaf filter and drum filter for primary, secondary and tertiary water washing, as well as dehydration operation before kiln and drying, which has made great contribution to the energy saving of titanium dioxide Especially in the aspect of dehydration operation, in the past, the vacuum leaf filter was used for the dehydration in front of the metatitanic acid kiln, and the solid content (TiO2%) after dehydration was only 30% ~ 32% Later, the ancient filter was used for dehydration through the introduction of technology, and the solid content was up to 40% ~ 45% Now almost all of the membrane filter press is used for dehydration in China, and the solid content can be as high as 50% ~ 60% 30% ~ 32% metatitanic acid dehydrated by leaf filter consumes 603 × 104kj / ttio2 for calcination and dehydration in rotary kiln, while 50% ~ 60% metatitanic acid dehydrated by diaphragm filter press only consumes 242.8kj/ttio2, which is equivalent to 82.8kg standard coal saved per ton of titanium dioxide, and the operation electricity cost is nearly 20% less than that of the rotary filter As the moisture content in metatitanic acid is greatly reduced, the production capacity of rotary kiln is significantly increased In the past, a φ 2400 × 38000 rotary kiln has a daily output of about 25t After dehydration by diaphragm filter press, the output can be increased to 35t / d In the past, the belt dryer and spray dryer were widely used in dehydration before titanium dioxide postprocessing Now, the domestic pigment grade titanium dioxide has almost been changed to flash dryer, which is also inseparable from the dewatering efficiency of diaphragm filter press Some experts calculate: the energy consumption of belt drier is 1, spray dryer is 1.21, the energy consumption of flash dryer is only 0.43, and the energy saving effect is very obvious In addition to the advantages of small equipment, small vibration, light wear, small floor area and low maintenance cost, the energy-saving effect of roller mill is also very obvious One pm125r Raymond mill has an hourly output of 4-4.5T and an installed capacity of 280KW, while the installed capacity of roller mill with the same output is only 65kW, It is equivalent to 53.75kw power saving per ton of product and 6.5kg/ttio2 converted into standard coal The achievements of preheat recycling in the utilization of waste heat from flue gas of rotary kiln and the recycling and reuse of process water and cooling water are also very obvious, especially in the recycling and reuse of water According to their own characteristics, each enterprise has done a lot of recycling and reuse work At present, the water consumption (fresh water) of titanium dioxide industry in China is about 45 ~ 80t / ttio2, which is compared with that in the 1980s It's almost halved Concerned about the WeChat official account, "paint net" There are some surprises to be observed If the swallow and the Wu Mei Niang sell paint, what will happen? 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