US1199041A - Process of treating certain aluminous abrasives. - Google Patents
Process of treating certain aluminous abrasives. Download PDFInfo
- Publication number
- US1199041A US1199041A US7468616A US7468616A US1199041A US 1199041 A US1199041 A US 1199041A US 7468616 A US7468616 A US 7468616A US 7468616 A US7468616 A US 7468616A US 1199041 A US1199041 A US 1199041A
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- United States
- Prior art keywords
- abrasive
- treating certain
- alloy
- aluminous
- aluminous abrasives
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/42—Micas ; Interstratified clay-mica products
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/38—Preparation of aluminium oxide by thermal reduction of aluminous minerals
Definitions
- iron in the alloy is over 80% of the whole, it is possible to remove a considerable proportion by means of a magnetic separator, but the separation is not complete, while if less than 80% ofiron be premnt in the alloy the latter is non-magnetic and none of it can be removed by magnetic separation.
- the conversion of the alloy into ferrosoferric titano-silicate is most readily efiected in the following manner: I suitably subdivide the crystalline abrasive and mix it with from 3% to 5% of a substance which will readily give up oxygen, such as potassium nitrate. This mixture is then placed in a furnace preferably of the reverberatory type and is subjected to high temperature in an oxidizing atmosphere.
- the material is maintained at this temperature which temperature is probably from 300 to 500 degrees higher than the temperature at which oxidization actively takes lace for from nine to twenty-four hours, ependent on the character of the alloy.
- the material may be treated by magnetic separation and afterward, if necessary, chemically treated as hereinbefore referred to, or in some cases the, chemical treatment substituted for the magnetic separation.
- What I. claim as my invention is 1. The process of treating artificially prepared granular aluminous abrasives'containing iron, silicon and titanium as impurities,
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Thermal Sciences (AREA)
- Geology (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Description
without Unrrnn s rn'rns ra rnnr EOEFFECEE.
THOMAS ALLEN, 0F NIAGARA FALLS, NEW YORK, ASSIGNOE TO GENERAL ABRASIVE COMPANY, OF NIAGARA. FALLS, NEW YORK.
PROCESS Oil? TREATING CERTAIN ALUMINOUS ABBASIVESL No Drawing.
To all whom it may concern Be it known that I, THOMAS Bones ALLEN, of the city of Niagara Falls, State of New York, United States of America, a subject of the King of Great Britain, have invented a certain new and useful Improved Process of Treating Certain Aluminous Abrasives, of which the following is a specification.
In my pending application No. 22468 I have described a process of forming abrasive materials from bauxite which results in the formation of a mixture of a substantially pure alumina, and an alloy of iron silicon and titanium. Most ofthe alloy settles out, but it is usually found that a certain amount of the alloy remains mixed with the crystalline alumina after solidification- In any subsequent crushing operation this alloy is distributed among the abrasive grains and must be removed if a sufficiently high quality in the abrasive articles made from the material is to be attained.
If the iron in the alloy is over 80% of the whole, it is possible to remove a considerable proportion by means of a magnetic separator, but the separation is not complete, while if less than 80% ofiron be premnt in the alloy the latter is non-magnetic and none of it can be removed by magnetic separation.
It has been proposed therefore to treat the subdivided abrasive by subjecting it to an oxidizing roast which results in the formation of oxids of iron, silicon and titanium, and thereafter chemically treating the roasted material to remove the oxidized impurities, but so far it has not been possible prejudicially affecting the abrasive grain to remove any but the iron oxid leaving behind the oxids of silicon and titanium which, for various reasons, have also a prejudicial efiect on the abrasive. The demand for precision in grinding necessitates not wheel, but demands that when any abrasive article has been found best suited for any given work that it shall always be possible to exactly duplicate the article. Unless the oxids of silicon and titaniumare removed,it is impossible to obtain the desired uniformity in either respect, owing largely to the tendency of the bonding materials employed in forming the abrasive articles to react Specification of Letters Patent.
only uniformity of grain in any individual with the oxids and form weak spots in Patented se at, rare.
Application filed January 27, 1916. Serial No. 74,686.v
the bonding. My aim therefore is to so treat the granular abrasive that all the impurities are converted into a readily removable form.
- According to my process I convert the alloy of iron, silicon and titanium into a ferroso-ferric titano-silicate which is magnetic even with less than 80% of iron in the unchanged alloy. Magnetic separation will thus eliminate most of the compound silicate and any traces remaining can be easily removed by the action of acids such as sulfuric and hydrochloric, or 'salts such as potassium hydrogen, sulfate. if more convenient, the chemical treatment may in some cases be used alone as a substitute for magnetic separation.
The conversion of the alloy into ferrosoferric titano-silicate is most readily efiected in the following manner: I suitably subdivide the crystalline abrasive and mix it with from 3% to 5% of a substance which will readily give up oxygen, such as potassium nitrate. This mixture is then placed in a furnace preferably of the reverberatory type and is subjected to high temperature in an oxidizing atmosphere.
I To obtain the desired chemical reaction I have found that a temperature-of from 1300 to 1500degrees centigrade is necessary. The
material is maintained at this temperature which temperature is probably from 300 to 500 degrees higher than the temperature at which oxidization actively takes lace for from nine to twenty-four hours, ependent on the character of the alloy. After the reaction is completed the material may be treated by magnetic separation and afterward, if necessary, chemically treated as hereinbefore referred to, or in some cases the, chemical treatment substituted for the magnetic separation.
By proceeding in the manner above described I am able to obtain an abrasive essentially free from impurities, and as a result abrasive articles produced therefrom are characterized by greatuniformityof structure and can always be accurately duplicated.
What I. claim as my invention is 1. The process of treating artificially prepared granular aluminous abrasives'containing iron, silicon and titanium as impurities,
which consists in heatin g such abrasive material mixed with an oxygen liberating salt at a temperature sufiicient to convert said impurities into a ferro 5 cate,
2. The process of treating artificially preso-ferric titano-silipared granular aluminous abrasives which consists 1n heating (such abrasive material mixed with an oxygen liberating salt to a grade.
Signed at T of December,
. two undersign Witnesses oronto, Canada, this 24th day 1915, in the presence of the ed Witnesses.
THOMAS .B. ALLEN.
E. P. HALL, L., M LEWIS.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7468616A US1199041A (en) | 1916-01-27 | 1916-01-27 | Process of treating certain aluminous abrasives. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7468616A US1199041A (en) | 1916-01-27 | 1916-01-27 | Process of treating certain aluminous abrasives. |
Publications (1)
Publication Number | Publication Date |
---|---|
US1199041A true US1199041A (en) | 1916-09-26 |
Family
ID=3266984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US7468616A Expired - Lifetime US1199041A (en) | 1916-01-27 | 1916-01-27 | Process of treating certain aluminous abrasives. |
Country Status (1)
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3853983A (en) * | 1973-05-21 | 1974-12-10 | Huber Corp J M | Method for improving brightness of kaolinite clays including iron pyrites |
US3860514A (en) * | 1970-09-21 | 1975-01-14 | Ethyl Corp | Method of beneficiating alumina-silica ores |
-
1916
- 1916-01-27 US US7468616A patent/US1199041A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3860514A (en) * | 1970-09-21 | 1975-01-14 | Ethyl Corp | Method of beneficiating alumina-silica ores |
US3853983A (en) * | 1973-05-21 | 1974-12-10 | Huber Corp J M | Method for improving brightness of kaolinite clays including iron pyrites |
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