The main chemical composition of bauxite is Al2O3, generally 40% to 70% by mass. It also contains SiO2, Fe2O3, TiO2 and a small amount of CAO, MgO and trace amounts of Ga, V, P, V and Cr. Al2O3 is divided into: gibbsite (Al2O3•3H2O), boehmite, and diaspore (all molecular formulas are Al2O3•H2O).
There are many methods for preparing Al2O3 from bauxite. At present, the alkali method is almost adopted in the industry, and it is divided into three types: Bayer method, sintering method and joint method:
Al2O3•3H2O (or Al2O3•H2O)+NaOH→(leaching/decomposing) NaAl(OH)4+ red mud→(seed decomposition/evaporation, causticizing) Al2(OH)3→(calcined)Al2O3.
Among them, the Bayer process is a typical hydrometallurgical method, which has an absolute advantage in alumina production. The key process is: leaching of bauxite - the main component of the leaching mother liquor is NaOH.
The quality and quantity of liquid alkali are related to the productivity of Al2O3 step by step, and there are strict requirements on its quality. Therefore, the quality inspection analysis of the liquid alkali entering the plant is an important task of the aluminum plant testing department, and the operation frequency is high. It is undoubtedly very important to use a fast and convenient concentration detection method.
The detection of laboratory alkali concentration is mainly carried out in accordance with the national standard [GB/T 4348.1-2013 "Measurement of sodium hydroxide and sodium carbonate in industrial use"]. That is, cesium chloride is first added to the sample solution, sodium carbonate is converted into cesium carbonate precipitate, and then phenolphthalein is used as an indicator, and titrated with a hydrochloric acid standard solution to the end point. The reaction is as follows:
Na2CO3 + BaCl2→ BaCO3↓+2NaCl
NaOH + HCl → NaCl + H2O
In the instrument configuration, the acid-base indicator can be manually titrated, and the terminal is judged according to the amount of hydrochloric acid consumed or directly read by an automatic potentiometric titrator (acid-base titration). The former is purely manual operation, which is a classic traditional method. The cost is low, but it is time-consuming and laborious. There is a large human error, especially the judgment of the end point of titration varies from person to person. The latter, although highly automated, is expensive and the electrodes need to be replaced frequently.
Previously, it was found that under certain conditions, the concentration of some media is related to the refractive index of light. Using the refractometer to determine the refractive index of these media solutions, the concentration of these media can be obtained accordingly. These media include: liquid alkali, ammonia water. , dimethylformamide (DMF), hydrogen peroxide, ethylene glycol, and the like. As a global leader in refractometers, ATAGO has developed nearly 100 media concentration meters using this property of media.
As the refractometer type continues to improve, we can not only use hand-held products to sample on-site inspections, but also sample them into the laboratory for higher-precision benchtop refractometer inspections, or use on-line refractometers for in-situ measurements to overcome the process The impact of data lag, sampling environment, temperature changes, manual operations, etc. on the accuracy of laboratory data. Timely adjustment of process conditions to ensure the stability of product quality indicators.
The principle of refraction measures the concentration of a substance, using the physical and optical properties of the substance, the test process does not consume any reagents, and the whole process is quite fast and portable. The mini digital refractometer Pal-40S is a special liquid alkali concentration meter with a range of 0.0-38.0%, resolution of 0.1%, accuracy of ±0.2%, and automatic temperature compensation. Digital refractometer PR-201a accuracy increased to ±0.1%, range Brix: 0.0-60.0%, automatic temperature compensation, not only can customize the conversion relationship between liquid alkali concentration and refractive index, but also achieve full range detection (saturated liquid The concentration of the alkali solution was 50%). In addition to the above functions, the online refractometer CM-800a can realize the in-situ detection of liquid alkali solution. The range: Brix: 0.0-80.0%, the ratio is 0.01%, the accuracy is ±0.1%, and the automatic temperature compensation.
After an alumina company uses our Pal-40S and CM-800a, the lye transport truck is one car and one car at the time of unloading:
1. Is the concentration up to standard: Is there water, or even water? - At a glance.
2. If the specified concentration is not reached, the price needs to be re-calculated – an important basis for billing
3. Before the two liquid alkali discharge sites, 10 workers, busy guarding the discharge, sampling and inspection, and now a worker at each discharge point, according to the data feedback obtained by the central control room to determine whether sampling is needed.
4. Raw material suppliers - unloading workers - Laboratory workers are less likely to collude because of the benefits. The production department can adjust the amount of liquid alkali to be adjusted according to the taste of the ore. The yield of Al2O3 is stable and controllable.
5. Safety has been significantly improved, reducing the number of possible workplace injuries. (The incident of a worker who had burned a liquid alkali)
Application & Function:
L-Carnitine is essential in the utilization of fatty acids and in transporting metabolic energy.
1) L-carnitine Powder can Promote normal growth and development;
2) L-carnitine Powder can Treat and possibly prevent cardiovascular disease;
3) L-carnitine Powder can Treat muscle disease;
4) L-carnitine Powder can Help build muscle;
5) L-carnitine Powder can Protect against liver disease;
6) L-carnitine Powder can Protect against diabetes;
7) L-carnitine Powder can Protect against kidney disease;
8) L-carnitine Powder can Aid in dietingDescri
Application & Function:
L-Carnitine is essential in the utilization of fatty acids and in transporting metabolic energy.
1) L-carnitine Powder can Promote normal growth and development;
2) L-carnitine Powder can Treat and possibly prevent cardiovascular disease;
3) L-carnitine Powder can Treat muscle disease;
4) L-carnitine Powder can Help build muscle;
5) L-carnitine Powder can Protect against liver disease;
6) L-carnitine Powder can Protect against diabetes;
7) L-carnitine Powder can Protect against kidney disease;
8) L-carnitine Powder can Aid in dietingDescri
1) L-carnitine Powder can Promote normal growth and development;
2) L-carnitine Powder can Treat and possibly prevent cardiovascular disease;
3) L-carnitine Powder can Treat muscle disease;
4) L-carnitine Powder can Help build muscle;
5) L-carnitine Powder can Protect against liver disease;
6) L-carnitine Powder can Protect against diabetes;
7) L-carnitine Powder can Protect against kidney disease;
8) L-carnitine Powder can Aid in dietingDescri
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CAS541-15-1 Hot Sale High Quality L-Carnitine Powder
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Product name:
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L-Carnitine
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Appearance:
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White crystalline powder
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Purity:
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99%min
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CAS:
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541-15-1
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Molecular Formula:
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C7H15NO3
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Molecular Weight:
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161.20
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EINECS:
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208-768-0
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Introduction:
The body produces carnitine in the liver and kidneys and stores it in the skeletal muscles, heart, brain, and other tissues. But its production may not meet the needs under certain conditions such as increased energy demands and therefore it is considered a onditionally essential nutriention. There are two forms (isomers) of carnitine, viz. L-carnitine and D-carnitine, and only the L-isomer is biologically active.
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