Q1: Reaction of chromium oxide with aluminum
1. Research on another aspect, such as reports, is still relatively frequent, and there are always modification methods, mechanisms, processes and conditions that are the focus of attention. Therefore, the core of common modification methods are heat treatment, inorganic and organic modification. sex and.
2. Based on the characteristics, the following representative silicate clay minerals need to be introduced one by one from the research status of their application in eutrophic water bodies.
3, 33Al67Mg, Fe particles are small, so the specific surface area is not large.
4. Also known as bentonite or bentonite, it is a clay rock with montmorillonite as its main component, so the layered structure of montmorillonite and the type and distribution of elements in the structure synergistically determine the energy Bentonite has excellent physical and chemical properties, including water absorption, adsorption, catalytic activity such as cation exchange.
Q2: The use of activated alumina balls
1. The preparation and adsorption capacity of activated alumina balls are introduced in detail, the raw materials for producing activated alumina, the urgent preparation method of activated alumina or its modification method.
2. Quickly de-powder and then rapidly calcine α-pentahydrate to produce it.
3. Pseudo-boehmite needs to be produced by carbonization method, alkali method, acid method, neutralization method and aluminum alkoxide method.
4. Quickly remove powder and make activated alumina balls by rolling and forming.
5. Pseudo-boehmite is formed by oil-ammonia column molding, extrusion molding, and spray drying to produce activated alumina that cannot be shaped like strips, clover shapes, and butterfly shapes.
6. Kolhapur developed five modification methods for activated alumina, each of which can also improve the physicochemical properties of activated alumina.
7. Clay mineral binding, especially in the adsorption of high fluorine concentration solution, the solution equilibrium fluorine concentration, adsorption capacity, solution pH and the amount of released hydroxyl groups are added with the addition of fluorine concentration.
Q3: Reaction of chromic acid with aluminum
1. When the pH of the fluorine solution is maintained by acid-base conditioning, the amount of fluorine adsorption in clay minerals should be added.
2. The adsorption data and the peak position of fluorine electron energy after soaking in each concentration are indicated.
3. The clay ore is stored in the middle, especially when the fluorine concentration solution is less than 5~100mg/L, the hydrogen ion is pre-adsorbed to make the surface active ten protonated, and it will communicate with fluorine soon.
4. With the addition of fluorine concentration, fluorine directly exchanges aluminum active ten hydroxyl groups and interacts with such cations.
5. Therefore, cryolite (and aluminum fluoride) deposits are formed especially when the concentration of the fluorine solution is much greater than 100 mg/L.
6. Clay mineral prints are formed especially when the high fluorine concentration solution is adsorbed. In my opinion, new deposits are related to the concentration of aluminum ions in the solution. The concentration of aluminum ions is less than .94mol/W to form cryolite deposits. The concentration of aluminum ions is less than .94mol. /S produces aluminum fluoride deposits.
Q4: Chemical equation for the reaction of aluminum and chromium oxide
1. Trivalent chromium galvanizing is a method of electro-galvanizing.
2. Electroplating chromium generally adopts hexavalent chromium plating solution.
3. Hexavalent chromium still has a pollution impact on various aspects of the environment, and then stepped up the research on the use of trivalent chromium electroplating in the country.
4. Hexavalent chromium is highly toxic and causes serious environmental pollution.
5. Chromium anhydride is widely used in chrome plating solution, which is the main pollution source of chrome-containing wastewater in electroplating industry.
6. In a nutshell, new problems have attracted widespread attention, and Western governments have also strengthened legal management. For example, the US emission standard for hexavalent chromium has not been lowered from 0.05mg/E to 0.05mg/E. 01 mg/M.
7. The problem of low current efficiency and poor coverage of hexavalent chromium plating solution is still the same.
8. The key is to reduce pollution and improve current efficiency and coverage. The trivalent chromium plating process is more and more popular.
Q5: The use of alumina balls
1. Various processes of drying, crushing, rapid decalcification, granulation, activation, high temperature roasting and packaging.
2. What is the use of activated alumina balls?
3. Activated alumina ball is a kind of white spherical hollow material with uniform micropore distribution, large volume, strong water absorption, low bulk density, high mechanical strength and small wear.
4. They are a fairly stable catalyst carrier and can also be used as a catalyst.
5. It is mainly used for dehydration and drying of various industrial gases in chemical industry, metallurgy, electronics and petroleum, such as air, oxygen, nitrogen and other permanent gases, smelting gases and petroleum cracking gases.
6. Activated alumina is a colloidal, high-strength alumina product that has a high affinity for water and is a desiccant for deep drying in micro-water.
Q6: Activated alumina ball high temperature
1. B-type alumina is made of aluminum hydroxide when it is dehydrated in a low temperature environment in my opinion. It is indeed called activated alumina and aluminum glue in the industry.
2. Therefore, in its structure, the oxygen ions are close-packed close to the cubic center, and the Al3+ is irregularly distributed as in the system surrounded by oxygen ions and in octahedral such as tetrahedral voids. Type 1 alumina is not necessarily soluble in water, but can be soluble in strong acid such as strong alkali solution, or when heated to about 1200, it will be completely converted into αA type alumina.
3. B-type alumina is a kind of porous material, the total internal surface area per gram is as high as one square meter, and the activity is high and the adsorption capacity is strong.
4. The industrial product Rivigni yellow-green or non-microstrip pink seems to me to be cylindrical particles with good pressure resistance.
5. For example, in petroleum refining and petrochemical industry, it is known as the catalyst carrier of adsorbent and catalyst in my opinion.
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