MXPA98005022A - Aluminum abrasive grain recovery - Google Patents
Aluminum abrasive grain recoveryInfo
- Publication number
- MXPA98005022A MXPA98005022A MXPA/A/1998/005022A MX9805022A MXPA98005022A MX PA98005022 A MXPA98005022 A MX PA98005022A MX 9805022 A MX9805022 A MX 9805022A MX PA98005022 A MXPA98005022 A MX PA98005022A
- Authority
- MX
- Mexico
- Prior art keywords
- grain
- abrasive
- vitreous
- alkali metal
- process according
- Prior art date
Links
- 239000006061 abrasive grain Substances 0.000 title claims abstract description 12
- 238000011084 recovery Methods 0.000 title claims description 6
- 229910052782 aluminium Inorganic materials 0.000 title description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title description 2
- 239000002585 base Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 9
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 8
- 238000009835 boiling Methods 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- 230000004520 agglutination Effects 0.000 claims description 10
- 230000024126 agglutination involved in conjugation with cellular fusion Effects 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005296 abrasive Methods 0.000 claims description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 239000011541 reaction mixture Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000003082 abrasive agent Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N Boron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 241001274216 Naso Species 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- -1 alkali metal salts Chemical class 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxyl anion Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- VSAISIQCTGDGPU-UHFFFAOYSA-N tetraphosphorus hexaoxide Chemical compound O1P(O2)OP3OP1OP2O3 VSAISIQCTGDGPU-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention provides a process for recovering aluminous abrasive grains from bonded, glassy materials by boiling the material in an aqueous solution of an alkali metal base.
Description
ALUMINUM ABRASIVE GRAIN RECOVERY
BACKGROUND OF THE INVENTION
The present invention relates to the recovery of abrasive grain ATumi naso from vitreous »agglutinated» abrasive articles such as grinding wheels and fragments thereof. The production of vitreous »agglutinated» abrasive articles implies the mixing of abrasive grains with the components that will form a glass in the fusion. This mixture can also include pore formers to ensure that the finished abrasive article is not lacking in porosity. In some cases, glass-forming components can be completely or partially replaced by crushed or "fried" glass. In general, the mixture is cold pressed into a mold to the desired size and then placed in an oven. As the temperature increases, the glass (or frit) components melt and combine to form the glass that then flows through the surfaces of the grains and is "preferably" located at points where the adjacent grains touch or are in contact with each other. close proximity. At these points »the glass forms vitreous columns that join adjacent abrasive grains. In this way, the typical vitreous bonded abrasive material comprises a large proportion by volume of grains which are held together by a relatively small volume of glass agglutination. When a vitreous agglutination wheel is formed, this wheel is often discarded when only a fraction of the volume was used. In addition »the manufacturing process can sometimes produce products that are outside acceptable standards» the product must be rejected and sent to landfill »maybe after having been crushed first» with all the additional costs that this implies. Although this type of waste »waste and waste is generated in the manufacturing process and tolerated as part of the cost of doing business» the value of the grain increases and the waste becomes increasingly unacceptable since the technology applied to the grain in itself it becomes increasingly sophisticated. Now a process has been discovered that allows the grain to be recovered from the abrasive »agglutinated» vitreous discarded materials and the fragments of said materials. The process is not costly and makes the recovery of aluminous grain economically feasible "as well as reducing the amount of sanitary landfill that needs to occur.
DESCRIPTION OF THE INVENTION
The present invention provides a process for the recovery of aluminous abrasive grain from the vitreous »agglutinated» abrasive materials which comprises: dissolving at least part of the agglutination material in a boiling aqueous solution »at 10X or more» of a base of alkali metal such »that the base reacts essentially and exclusively with the agglutination material» and then separate the grain. Vitreous plants used in the manufacture of agglutinated vitreous abrasives comprise an amorphous or partially crystalline mixture of oxides (including mixed or complex oxides) »having major components selected from: silica, alumina, boron oxide , phosphorus oxide »alkali metal oxides» alkaline earth metal oxides and other small amounts of metal oxides which may include iron, titanium and lead »for example. Some of these, such as silica (which is the dominant component of all glasses), readily form alkali metal salts that are at least partially soluble and when removed, cause the glass to lose its strength and structural integrity. . The preferred agglutination materials comprise at least 30X "as well as at least 50X and" frequently "as much as 60X or more by weight of silica. Reactable materials with an alkali metal base can be, for example, lithium hydroxide, sodium hydroxide or potassium hydroxide and mixtures thereof. Hydroxide sodium and hydroxy or potassium are often the most convenient in practice. However, it is possible to use a base such as alkali metal carbonate or bicarbonate, although the reaction can be expected to take a little longer. The concentration of the base clearly controls the speed of the reaction to a certain degree and "for this reason" preference is given to more concentrated solutions. When using an alkali metal base »it is preferable that the concentration is at least 30% >; about 40 to 60K in weight of the hydroxide. However, if the alkali metal is lithium, the mere lightness of the metal makes it possible to operate at a weight percent of only 10% of the base. If weaker solutions are used or if the reaction is completed before it is completed, the reaction must have advanced to the extent that the agglutination has been sufficiently weak to allow easy disintegration of the material, so that a simple operation burr removal mechanics allow the separation of the individual grains i. The reaction occurs with the accompanying heat to accelerate the reaction. Typically, the vitreous bonded material is boiled with the base. Where there is a likelihood that the reaction product will solidify like a glass on cooling, hot filtering is convenient to separate the grains. Otherwise, cold filtration is an acceptable method. The nature of the separated aluminous grain is not critical as long as the grain itself is not substantially reactive with the base with which the abrasive material reacted. Some degree of reaction can be tolerated but this should not be such as to undermine the economy of the procedure. The aluminum oxide abrasive grains as well as the alumina / zirconia grains react relatively little with the alkali metal bases and such abrasive grains can be rescued by the aforementioned technique.
DESCRIPTION OF THE PREFERRED MODALITY
The invention is now illustrated with reference to the following examples, which are presented for the sole purpose of illustration and do not imply any essential limitation on the scope of the invention.
EXAMPLE 1
Fragments of an abrasive, agglutinated, vitreous, discarded wheel comprising an abrasive grain of sewn ßol-gel alumina and an agglutination with the empirical formula, expressed as moles of the oxides: Na90..0.47; Ka0..0.07 »MgO..O.25; Cao..0.21; Ala03..0.5T; Fea03..0.01; B20a..0.65; SiOat..3.77 and TiOa..0.03. Parts of the grinding wheel with a size of 3-20 mm and weight of 19 g were added to 50 g of a 50 S sodium hydroxide solution in a stainless steel vessel.
Heating the mixture to its boiling point (approximately 140 ° C) continued for about 30 minutes. At the end of that time, it was found that the fragments had disintegrated and the grain had separated spontaneously. The mixture was filtered, cooled and washed with water. Recovered abrasive grains that were substantially free of vitreous agglutination.
Claims (5)
1. - A process for the recovery of aluminous abrasive grain from among abrasive, agglutinated, vitreous materials »which comprises boiling the materials in an aqueous solution of an alkali metal base. at least »10X» by way of dissolving at least part of the agglutination material and then separating the grain.
2. A process according to claim 1 wherein the alkali metal base is selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide and mixtures thereof.
3. A process according to claim 2 »wherein the base solution has a concentration of at least 30% by weight.
4. A process according to claim 1 wherein the agglutination comprises at least 30% by weight of silica.
5. A process according to claim 1 wherein the agglutinated vitreous material is heated with the base solution and the grain is separated from the reaction mixture by means of filtration while the mixture is still hot.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/575,655 US5578222A (en) | 1995-12-20 | 1995-12-20 | Reclamation of abrasive grain |
| US08575655 | 1995-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9805022A MX9805022A (en) | 1998-09-30 |
| MXPA98005022A true MXPA98005022A (en) | 1998-11-16 |
Family
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