Last edited by Mular
Tuesday, May 12, 2020 | History

2 edition of Zone refining and allied techniques. found in the catalog.

Zone refining and allied techniques.

Norman Lawrence Parr

Zone refining and allied techniques.

by Norman Lawrence Parr

  • 389 Want to read
  • 32 Currently reading

Published by G. Newnes in London .
Written in English

    Subjects:
  • Zone melting.

  • Edition Notes

    Includes bibliography.

    StatementWith a foreword by E.J. Vaughan.
    SeriesNewnes practical science books
    Classifications
    LC ClassificationsTN686.5.Z6 P3
    The Physical Object
    Pagination184 p.
    Number of Pages184
    ID Numbers
    Open LibraryOL5811801M
    LC Control Number60050849
    OCLC/WorldCa2133690

    Zone refining is an industrial process which makes use of the fact that a material often solidifies with a higher purity than the surrounding liquid, in order to produce materials of very high purity. A bar is passed through a furnace that melts a small section of the bar. As the bar passes through the furnace, this section of liquid is passed. Zone One may not be Whitehead's finest novel, but it's a satisfying, riveting read. The beautifully long, descriptive sentences are richly sensuous, and the languid plot is driven by characters rendered life-like through the author's choice of third-person omniscient narration.

      THE technique of zone refining has been applied very successfully to the purification of metals and elements1, especially in the semi-conductor field where very high purity is .   GAIN A COMPLETE UNDERSTANDING OF THE LATEST PETROLEUM REFINING PROCESS TECHNIQUES. This authoritative resource will prove essential for anyone who needs current, expertly written coverage of the latest developments in the petroleum refining process industry. This fully revised Fourth Edition is a complete compendium of licensable technologies for the refining of .

    Determination of Effective Distribution Coefficient of Impurities During Zone Refining of Tellurium Article in International Journal of Modern Physics B 22(16) June with Reads. Zone refining is one of a class of techniques known as fractional solidification, in which a separation is brought about by crystallization of a melt without solvent being added. Zone refining can be applied to the purification of almost every type of substance that can be melted and solidified, e.g., elements, organic compounds, and inorganic.


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Zone refining and allied techniques by Norman Lawrence Parr Download PDF EPUB FB2

Additional Physical Format: Online version: Parr, Norman Lawrence. Zone refining and allied techniques. London, G. Newnes [] (OCoLC) Document Type.

Zone refining and allied techniques [Norman L Parr] on *FREE* shipping on qualifying offers. Zone melting (or zone Zone refining and allied techniques. book or floating-zone process or travelling melting zone) is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot.

Zone melting, any of a group of techniques used to purify an element or a compound or control its composition by melting a short region (i.e., zone) and causing this liquid zone to travel slowly through a relatively long ingot, or charge, of the the zone travels, it redistributes impurities along the charge.

The final distribution of the impurity depends on its distribution in the. Other articles where Zone refining is discussed: zone melting: Zone refining is the most important of the zone-melting techniques.

In zone refining, a solid is refined by passing a number of molten zones through it in one direction. Each zone carries a fraction of the impurities to the end of the solid charge, thereby. ZONE REFINING Zone refining is a technique used to purify materials, mainly semiconductors by melting a short region (i.e., zone) and causing this liquid zone to travel slowly through a relatively long rod of the solid.

After going through this learning aid, learner will be able to • Interpret the concept of Zone Size: KB. que called zone refining. If two of e elements, germanium and silicon, not been available in the desired In zone refining, which is probably the most important zone melting technique, a number of molten zones are passed through the charge in one direction.

Each moving zone carries a fraction ofFile Size: KB. Meyer's book is useless to anyone new to oil refining but may be useful in the library of an old hand. If this review was helpful, please add your vote. Read more. 6 people found this helpful.

Helpful. Comment Report abuse. Teodoro A Cantu. out of 5 stars Five Stars. Reviewed in Cited by:   Zone Refining This technique is based on the standard that the impurities are more soluble in the melt than in the sold of the melt.

A circle mobile heater is fixed at one end of a rod of the. One of a number of techniques used in the preparation of high-purity materials. The technique is capable of producing very low impurity levels, namely, parts per million or less in a wide range of materials, including metals, alloys, intermetallic compounds, semiconductors, and inorganic and.

Zone refining definition is - a technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined, picks up impurities at its advancing edge, and then allows the purified part to recrystallize at its opposite edge —called also zone melting.

Phase Diagrams: Zone Refining High purity silicon is required for the semiconductor industry and the needed levels cannot be reached by chemical methods alone.

Zone refining techniques for purification use the solid-liquid phase transition to purify the solid by expelling impurities to the remaining liquid. The phase diagram shown indicates the difference in impurity content between. Zone Refining Unit. Zone melting is a family of techniques, variation of which are applied in semiconductor industry viz.

Zone refining for purification of semiconductor elements, zone leveling for uniform addition of dopants to the semiconductors and Bridgman’s or. The optimum zone length condition illustrated for (a) k >1 and (b) k Cited by:   Abstract The purification of tin by a new method of zone refining is described.

The method is characterized by alternating high-speed clockwise and anticlockwise rotations (0 to rpm) of the containing tube at short intervals ( to 10 sec). The experimental parameters which affect the degree of purification were investigated in some by: 2.

Zone refining is a technique companies can use in the production of highly pure crystals for components like transistors.

In this method, impurities in an ingot, or mass of metal, are forced to one end or another through a series of melting and cooling leaves behind a chunk of mostly pure material available for use in seed crystals and other components.

zone refining 1. In metallurgy, the smallscale production of high-purity metals using the principle that an impure melt will deposit pure crystals on solidifying. A rod of the specimen is melted over a very narrow region at one end, and then the molten region is transferred along the rod by means of a moving furnace.

Source for information on zone refining: A Dictionary of Earth Sciences. Purification of tellurium (MP ∼°C) by zone refining is relatively easy when compared to cadmium (MP °C) because of the lower thermal conductivity of tellurium (∼ W cm −1 K −1 at room temperature (RT)), when compared to cadmium (∼ W cm −1 K −1 at RT) coupled with a relatively high melting point.

The volume expansion Cited by: PETROLEUM REFINING AND THE PROD UCTION OF ULSG AND ULSD OCTO Page 2 2. PETROLEUM REFINING AT A GLANCE Petroleum refining is a unique and critical link in the petroleum supply chain, from the wellhead to the pump.

The other links add value to petroleum mainly by moving and storing it (e.g., liftingFile Size: KB. Zone refining definition, a process of purifying any of various metals and other materials, as germanium or silicon, by passing it in bar form through an induction coil. See more. Numerical Modelling and Optimisation of Zone Refining Article in Journal of Alloys and Compounds (s 1–2)– February with 62 Reads How we measure 'reads'.Int the 's, a process called zone refining or zone melting was developed that improved fractional recrystallization.

This method, though effective, was very slow and required a great deal of attention. Now, the Purifier 10 Zone Refiner has improved this time-tested method to offer an instrument that is faster, easier to use, more versatile.Zone refining is a process in which organic and inorganic compounds are purified.

1 Like distillation and gas and liquid chromatography, zone refining is dependent on the distribution of material between two phases. However, the distribution in zone refining is between the solid and liquid phases, while the distribution in distillation and gas chromatography is between the liquid and vapor phases.