Bolg-Shandong Orvey New Material Technology Co., Ltd.

At present, the main methods for removing fluoride from fluorine-containing water include adsorption, electrocoagulation, reverse osmosis, ion exchange, chemical precipitation, and coagulation sedimentation. Among these methods. In the process of fluorine removal by adsorption method, when the adsorbent reaches saturation, it needs to be regenerated to restore its adsorption capacity. At present, the commonly used adsorbent is the activated alumina adsorption method. The following describes the treatment method of activated alumina defluoridation regeneration wastewater: When the activated alumina adsorption reaches saturation, it needs to be regenerated. It can be regenerated with aluminum sulfate or sodium hydroxide. There will be high concentration of fluorine-containing wastewater during the regeneration of activated alumina. The average content is about F-1000mg/L. According to the "Integrated Wastewater Discharge Standard" (GB8978-1996), F- is 10mg/L, so it must be discharged after special treatment reaches the standard. The basic conditions of the activated alumina regeneration wastewater treatment process test: the external dimension of the test device is Φl60mmx3000mm, the internal activated alumina is 30L, and the filling height is 2000mm; the regeneration method uses 1 times 3% NaOH solution to rinse for 2 hours, and then 5 times of clean water to rinse 1.5 h, then neutralize with 1 times 1% H2S04 solution for 1.5 hours, wash with 2 times clear water for 0.5 hours until the effluent pH value is 6-7; the regeneration flow rate is 60L/h. It has been verified by practice that the current good treatment method for activated alumina defluoridation regeneration wastewater is: the three-stage chemical coagulation sedimentation method using CaCl2+PAC+PAM is an effective and applicable process for treating high-content fluorine-containing wastewater, which can stably achieve First level discharge standard of comprehensive sewage discharge standard

2020

Introduction of activated alumina seed crystals

1. Control factors affecting the decomposition quality of seed crystals. The quality and quantity of active seed crystals are one of the important factors affecting the particle size and decomposition rate of activated alumina regenerant. Second, the activity of the activated alumina regeneration agent seed crystal mainly depends on the preparation method and conditions of the seed crystal, storage time, the structure of the seed and the particle size of the seed crystal and other factors. 3. Coarse wet grinding with activated alumina regeneration agent is used. In order to ensure the activity of the seed crystals, the storage time of the seed crystal slurry in the storage tank is generally not more than 3 days. Activated alumina has better quality due to the fact that the particles of the activated alumina regenerant after grinding become extremely fine, which improves the dispersibility and activity, and thus obtains a special crystal with an average particle size of less than 110μm, good dispersibility, high activity, and appropriate moisture. Seed slurry, for adding when the seed crystal is decomposed.

2020

The relationship between activated alumina carrier and calcination temperature

Activated alumina carrier is widely used in actual industrial production. Among them, activated alumina is an inorganic substance with excellent performance. It can not only be used as dehydration adsorbent, chromatography adsorbent, but also as a carrier, active oxidation The aluminum carrier is widely used in the petrochemical field. It involves various reactions such as reforming, hydrogenation, dehydrogenation, dehydration, etc. What is the relationship between the activated alumina carrier and the roasting temperature? The following is a detailed introduction: The use of hydrothermal treatment and the addition of pore expanders can effectively control the pore structure of the activated alumina carrier, but after forming, the baking process is also one of the important factors affecting the pore structure. Roasting includes processes such as dehydration, dehydroxylation, particle sintering, decomposition or removal of volatile substances, and burning of organic matter. These processes all affect the pore structure of the activated alumina carrier. With the increase of the calcination temperature, the average pore diameter gradually increases. For every 100°C increase in temperature, the proportion of pores larger than 20nm increases by about 5%; the corresponding specific surface area gradually decreases. The increase in the overall pore diameter of activated alumina is mainly caused by the collapse of smaller pores at high temperature to form larger pores. With the increase of the calcination temperature, the content of activated alumina increases, and the specific surface area and pore volume decrease. When the temperature is higher than 450°C, the content remains basically unchanged, while the specific surface area and pore volume still show a downward trend. Activated alumina with high specific surface area and large pore volume can be obtained when the calcination temperature is 450°C. In addition, proper adjustment of the heating rate can completely remove the water in the pores of activated alumina, thereby eliminating agglomeration and fracture.

2020

What should be paid attention to when selecting activated alumina?

1. Drying of liquid organic compounds usually involves adding activated alumina to the liquid organic compound. The activated alumina used must not react chemically or catalytically with the organic compound. 2, activated alumina should not dissolve in the liquid organic compound. 3. When selecting activated alumina that combines with water to form hydrates, the water absorption capacity and drying efficiency of activated alumina must be considered. Water absorption capacity refers to the amount of water absorbed per unit weight of activated alumina, and drying efficiency refers to the degree to which the liquid is dried when equilibrium is reached. For example, anhydrous sodium sulfate can form Na2SO4·10H2O, that is, 1gNa2SO4 can absorb more than 1.27g of water, and its water absorption capacity is 1.27, but the water vapor pressure of its hydrate is also larger (255.98Pa at 25°C), so the drying efficiency difference. Calcium chloride can form CaCl2·6H2O, and its water absorption capacity is 0.97. The water vapor pressure of this hydrate is 39.99 Pa at 25°C. So although the water absorption capacity of anhydrous calcium chloride is small, it has strong drying efficiency. Therefore, the appropriate activated alumina should be selected according to the specific requirements of removing moisture during the drying operation. Sometimes for systems with a lot of water, the activated alumina with large water absorption is often used for drying, and then the activated alumina with strong drying efficiency is used. Generally, this kind of activated alumina requires a certain equilibrium time to form hydrates. Therefore, after activated alumina is added, it must be placed for a period of time to achieve the dehydration effect. Activated alumina that has absorbed water will be dehydrated after being heated, and its vapor pressure increases with the increase of temperature. Therefore, the activated alumina must be filtered out before the distillation of the dried liquid.

2020

Shandong Orvey New Material Technology Co., Ltd. official website will be launched soon!

Shandong Orvey New Material Technology Co., Ltd., located at No. 1, Zhujiang Road, Economic Development Zone, Zhangdian District, Zibo City, is a leading enterprise in new adsorption series products. We are a high-tech enterprise integrating research, development, production and sales. Products are widely used in air separation equipment, large air compressors, defluorinated water plants, urban water supply, drainage, and chemical, metallurgical, electric power, oilfield, Papermaking, industrial sewage treatment and other fields. The company has strong technical force, sophisticated equipment, advanced technology, quality management standards, and strong scientific research and development capabilities. It is an advanced enterprise with diversified innovation and development. Shandong Aowei New Material Technology Co., Ltd. is a company that has developed and produced activated alumina and series products for many years. Over the years, the self-developed and developed product production technology and business management experience, perfect quality control system and environmental awareness have enabled its products to keep up to date with the times and meet market needs, and the company's performance continues to rise. The main products are desiccants, special adsorbents for hydrogen peroxide, sulfur recovery catalysts, desiccants for petrochemicals, polyethylene deashing agents, catalyst carriers for various purposes and hydrogenation catalysts. The product is stable, and the production index conforms to the national industry standard. Among them, polyethylene deashing agent and special adsorbent for hydrogen peroxide fluidized bed process are currently one of the domestic manufacturers. Stable product quality and perfect after-sales service have been recognized and praised by customers at home and abroad. Our company's annual production capacity is more than 10,000 tons. In order to manufacture and provide better products, we continue to raise the requirements for products, in the increasingly fierce market competition, constantly adjust the industrial layout and development strategy, insist on technological innovation to seek breakthroughs, and use product quality to hit the market. The company has successively passed the certification of quality management system, environmental management system, occupational health and safety management system, and the second-level certification of safety production management standardization. We warmly welcome domestic and foreign users to visit our company, and also warmly welcome relevant experts to come to our company for guidance and seek common development.

2020

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Shandong Orvey New Material Technology Co., Ltd.

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Add: No. 1, Zhujiang Road, Economic Development Zone, Zhangdian District, Zibo City, Shandong Province
Phone: +86-533-2886234 / +86-533-3080282
Mobile: +86-13678639999 (Mr. Li)
E-mail: sales@sdawxcl.cn

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