Mixed production of alumina process
[China Aluminum Industry Network] Alkaline recycling process features Mixed alkaline circulation, fully illustrates the process characteristics and production organization of the hybrid process. A. The hybrid process is a closed type, so Bayer... Sinter has a certain restriction on the production capacity between the two systems. That is to say, the main joint point of the hybrid method: the red mud produced by the Bayer process must be balanced (consumed) by the sintering method; the seed...
Alumina single board performance and application
[China Aluminum Industry Network] The aluminum veneer process is different from the ordinary varnish process. It electrolyzes the conductive acidic electrolyte through the current, which causes oxidation of the surface of the aluminum metal that constitutes the anode, which naturally grows on the aluminum surface to a thick and dense layer. Alumina protective film, this oxide film is not an additional layer and will not peel off. The oxide film is transparent and colorless, and the...
Alumina production process
[China Aluminum Network] Because 80% of China's bauxite capital is high-aluminum, high-silicon, hard-dissolved diaspore, for this kind of capital, it is not possible to follow the commonly used Bayer process for the production of alumina. China's alumina production process is mainly as follows: 1. Sintering method: The traditional method for the insoluble characteristics of Chinese bauxite. At present, the production of alumina by the sintering method still accounts for about 40% of the...
Domestic high-purity alumina enterprises welcome rapid growth
[Chinalco.com] raised its target price by 52.0 yuan and raised its rating to "overweight." As the company's ceramic ink gross margin was lower than expected, we revise down EPS for 2014 to RMB 0.65 (originally RMB 0.79). As the company's newly added high-purity alumina business will usher in an outbreak in 2015, we increase the EPS for 2015 and 2016 to 1.30. Yuan, 1.76 yuan (the original 1.15 yuan, 1.63 yuan) yuan. We believe that the company's two most important reserve products, high-purity...
Alumina plate chemical polishing defects and countermeasures
[China Aluminum Network] The defects in the chemical polishing of anodized alumina plates and their corrective measures are continuously summarized during the development of production. Insufficient brightness This is a concern in chemical polishing. The brightness does not reach the desired target, and the reason can be analyzed from the production process of special aluminum materials and the chemical polishing process. The production process of special aluminum materials has been discussed...
High alumina bricks have different effects
According to the aluminum oxide (Al2O3) content of high-alumina brick, 48%, 55%, 60%, 65%, 73%, and 75% of the content of high-alumina brick is currently used. Of course there is a higher content of the above attributed to corundum. According to the amount of 55 or less, it is called a clay brick, which is a neutral refractory material and is made by bakelite or other materials with high alumina content. With high thermal stability, fire-resistant temperature is about 1700°C, which is used for...
Alumina Hollow Ball Brick Making Process
[China Aluminum Network] Manufacturing Process First, alumina hollow spheres are prepared and alumina hollow bricks are made. Step 1. Preparation of alumina hollow spheres Alumina hollow spheres were prepared using industrial alumina as a raw material, melted by eutectic melting and then blown. Electrofusion equipment is an electric arc furnace. The molten pool is made of graphite or other refractory materials, a flow opening is built on the edge, a nozzle for compressed air is installed on the...
How Alumina Goes to the Electrolyzer
【China Alumina Network】 The alumina plant purchases alumina stored in a silo and pipes it to electrolysis cells in the electrolysis plant. There are three ways to transport alumina to the electrolytic cell: dilute phase transport, dense phase delivery, and ultra-dense phase delivery. That is to say, alumina uses air as its carrier and “runs” from the pipeline to the electrolytic cell under external force. Dilute phase transport When dilute phase transport, the solid-to-gas ratio is very low, ie...
Alumina production cost element
According to the alumina production process, the production cost of alumina is roughly composed of the following: (1) Raw materials: bauxite, limestone, alkali (soda ash and caustic soda), etc.; (2) Auxiliary materials: steel balls, grease, conveyor belts, etc.; (3) Fuel and power costs: power consumption, steam consumption, water, heavy oil, coke, etc.; (4) Other costs: labor, manufacturing, management expenses. During this period, bauxite is the primary raw material and the primary source of...
Problems to be Noted When Using High-alumina Cement
【China Aluminum Industry Network】 (1) The suitable hardening temperature is about 15°C. In general, the ambient temperature during construction must not exceed 25°C. Otherwise, crystal transformation will occur and the strength will decrease. Concrete made of high alumina cement cannot be steam cured. (2) It is strictly forbidden that high-alumina cement is mixed with Portland cement or lime, and it must not be in contact with Portland cement concrete that has not been hardened. Otherwise,...
Drying two refractory bricks on an alumina screed
[CNC] It is well-known that currently most of the leakage tanks for electrolytic cell damage are in the seam zone at the bottom of the squeezing paste, and the bottom of the bonding tank, due to the elimination of the sinusoidal joint, can be a clean and nearly integral new cathode structure, preventing carbon paste. Poor quality of tamping and roasting paste produce pores and cracks, and aluminum liquid is not easy to penetrate, prolonging the service life of the tank. In addition, the lining...
Characteristics and Application of High-alumina Cement
【China Aluminum Industry Network】 (1) Fast, hard, early strength, rapid growth in early strength, should be used for emergency repair projects (building roads, bridges, plugging, etc.) and early strength requirements of the project. However, the strength of high-aluminum cement in the later period may decrease, especially in the hot and humid environment above 30°C, the strength will decline faster, and even cause structural damage. Therefore, the use of high-alumina cement in structural...
Improve the Production Process of High-alumina Bricks and Promote the Quality Improvement of Bricks
[China Aluminum Network] High-alumina bricks, common materials used to produce MgO-Cr2O3 products are mainly magnesia, chrome ore, synthetic magnesia-chromium sand, and sometimes some additives are added. Sintered magnesia and fused magnesia with different MgO content (generally greater than 89%), in combination with refractory chrome ore with different Cr2O3 content, chromium concentrate, sintered or fused magnesia chromite (sometimes adding a little Chromium green) can produce many kinds of...
Aluminum Corporation of China, Shanxi Really Creates Record High Alkaline Alumina in October
[China Aluminum Network] In October, with the joint efforts of all the cadres and staff, China Aluminum Shanxi Branch completed 210,100 tons of alumina production, setting a record high. Since entering the month of October, the company has been guided by the spirit of the "100 days of fighting for the battle to win the battle to defend against survival." All units have clarified specific measures, meticulously implemented, daring to perform, and dedication, and focused on improving production...
Rusal's joint company uses acid method to produce alumina
According to news from Moscow on October 14, RUSAL developed an acid process to produce alumina and use acid to treat non-bauxite raw materials. The technology can use its domestic kaolin to replace imported bauxite, resulting in lower material costs and logistics costs, which greatly enhance the economic benefits of the RUSAL smelter. Using this technology to produce alumina, it is also possible to produce some high-demand products at the same time, including silica and rare earth metal-based...
Alumina fiber applications
[China Aluminum Network] Alumina fiber thermal conductivity, heat shrinkage and heat capacity are lower. Long-term use temperature is 1300 ~ 1400 °C, higher than ordinary aluminum silicate fibers (1000 ~ 1100 °C). It has good chemical stability and can be used in acidic environment, oxidizing atmosphere, reducing atmosphere and vacuum conditions. It also has certain corrosion resistance to alkaline environment, but it is vulnerable to lead vapor and vanadium pentoxide. This fiber is mainly used...
The Importance of Controlling Alumina Content in Electrolysis
【China Aluminum Industry Network】 Alumina is an important part of the electrolytic aluminum production process. It is necessary to perform qualitative analysis and research on the alumina content. This article will introduce the effect of alumina content on the main production parameters of electrolytic aluminum. 1. Effect of alumina content on current efficiency There are two arguments for this problem in the scientific community. One is that the alumina content is high and the current...
Problems to be Noted When Using High-alumina Cement
【China Aluminum Industry Network】 (1) The suitable hardening temperature is about 15°C. In general, the ambient temperature during construction must not exceed 25°C. Otherwise, crystal transformation will occur and the strength will decrease. Concrete made of high alumina cement cannot be steam cured. (2) It is strictly forbidden that high-alumina cement is mixed with Portland cement or lime, and it must not be in contact with Portland cement concrete that has not been hardened. Otherwise,...
Explain the influence of different components of high-alumina firebrick on performance
[China Aluminum Network], also known as alumina brick high-alumina refractory bricks, similar to its production and stick with a brick manufacturing process, the difference is more mixed flour mixed with high alumina clinker, refractoriness than clay brick, acid and alkali resistant invasion Good candle performance, suitable for use in various furnace firing belts, etc. Al2O3 content of more than 48% aluminum silicate refractory bricks collectively referred to as high-alumina firebrick....
According to the performance of different types of high alumina bricks
【China Aluminum Industry Network】 1. Ordinary high-alumina brick The main mineral composition of the refractory brick is Yinglai stone, corundum and glass phase. As the content of Al2O3 in the product increases, the mullite and corundum increase, and the glass phase decreases accordingly. , The product's refractoriness and high temperature performance increase. Ordinary high-alumina bricks have a series of superior fire resistance than clay bricks. They are a kind of material with good...
How does bauxite become alumina?
[China Aluminum Industry Network] Bauxite is actually a term commonly used in industry and refers to the ore consisting mainly of gibbsite, boehmite or dicalite. Bauxite is the main ore resource in current alumina production. More than 99% of alumina in the world is produced from bauxite. The method of producing alumina from bauxite can be roughly divided into four categories, namely alkali method, acid method, acid-base combination method and thermal method. However, almost all of them used in...
How does bauxite become alumina?
[China Aluminum Industry Network] Bauxite is actually a term commonly used in industry and refers to the ore consisting mainly of gibbsite, boehmite or dicalite. Bauxite is the main ore resource in current alumina production. More than 99% of alumina in the world is produced from bauxite. The method of producing alumina from bauxite can be roughly divided into four categories, namely alkali method, acid method, acid-base combination method and thermal method. However, almost all of them used in...
Major differences between aluminum, alumina, aluminum ingots, electrolytic aluminum, and primary aluminum
[China Aluminum Industry Network] Aluminum is a silver-white metal, which ranks third in the earth's crust after oxygen and silicon. Aluminum has a low density and is called light metal. Aluminum is a non-ferrous metal with high output and usage. It is second only to steel in the world. The density of aluminum is about 1/3 of that of steel and copper. Due to the lightness of aluminum, it is commonly used in land, sea, and air transportation in manufacturing, trains, subways, automobiles,...
What effect does the hydrochloric acid treatment have on the phase transformation of industrial alumina calcinations?
【China Aluminum Network】 α-Al2O3 has excellent physical and chemical properties and is widely used in refractory, ceramic, chemical and other industrial fields. At present, α-Al2O3 is mainly produced by calcining industrial alumina in industrial production, but industrial alumina contains alkali metal oxide (exhibiting more prominently with Na2O), and high calcining temperature causes α-Al2O3 to have large grain size and agglomerates. Too many problems lead to a great influence on the high...
