CN101813692B

CN101813692B - Method for polishing glass and abrasive composition for polishing glass

Info

Publication number: CN101813692B
Application number: CN 201010126119
Authority: CN
Inventors: 小宫广嗣; 一杉哲也; 筱塚隆广; 远藤一明
Original assignee: KIYOMI CHEMICAL CO Ltd
Current assignee: KIYOMI CHEMICAL CO Ltd; Seimi Chemical Co Ltd
Priority date: 2004-05-20
Filing date: 2005-05-02
Publication date: 2012-08-29
Anticipated expiration: 2025-05-02
Also published as: TW200608012A; JP4131870B2; CN101813692A; WO2005114177A1; JPWO2005114177A1; CN1957253A; CN1957253B; TWI297074B

Abstract

The invention relates to a method for polishing glass and an abrasive composition for polishing glass, especially abrasive particles which are reduced to an utmost limit in the occurrence of the latent flaw in an article to be polished, with the retention of the polishing rate at a substantially high level. An aqueous dispersion of an abrasive material formed by adding abrasive particles to be measured to an aqueous medium is irradiated with an ultrasonic wave, and then a ratio (which is defined as a dispersion ratio (Xi)) of the disappearance of the particles having a particle diameter of a specific value or more before the irradiation, due to the ultrasonic wave irradiation, is measured, wherein xi is represented by the formula (1): Xi = [(V0-Vt)/V0] * 100 (%) (1), wherein V0 represents the amount of particles having a particle diameter of a specific value or more being present before the ultrasonic irradiation, and Vt represents the amount of particles having a particle diameter of the specific value or more being present after the ultrasonic irradiation]. Use is made of the abrasive particles exhibiting a dispersion ratio of a specific value or higher.

Description

Glass grinding method and glass grinding are with grinding the material constituent

The application is that application number is 200580016214.7, the applying date is on May 2nd, 2005, denomination of invention is divided an application for the one Chinese patent application of " method for evaluation of quality, glass grinding method and the glass grinding that grind the material particle are with grinding the material constituent ".

Technical field

The present invention relates to glass grinding with grinding material; In detail; Relate to the smooth grinding that is suitable for various glass materials; Can keep especially with the rare-earth oxide that contains cerium oxide be the glass grinding of Main Ingredients and Appearance with the high grinding rate that grinds material, and the damage (particularly dive and hinder) that produces can reduce abrading glass the time is to from the glass grinding of the degree that the do not had appraisal procedure with grinding material and quality thereof.

Background technology

Glass material is used on the various uses in recent years, is not only optical applications such as optical lens and uses glass material, also is used in liquid crystal and uses glass substrate; Recording medium such as disk, CD is used glass substrate; And in the field of LSI light shield with circuit manufacturing usefulness such as glass substrates, it all requires to carry out accurately surface grinding basically.

, be to use with rare-earth oxide in the employed grinding material of the surface grinding of said glass substrate, particularly be the grinding material of Main Ingredients and Appearance with the cerium oxide in the past.This is because than zirconia or silica, as the excellent advantage of glass grinding efficient of the cerium oxide of abrasive grains.Yet; Being subjected to the production of digital household appliances product etc. in recent years grows up rapidly; Aspect the FPD such as for example LCD of its frame device (backbone デバイス); Display frame is maximized gradually, or the small panel as the Portable terminal also is necessary brightly display color striograph etc., and requires meticulousr goods.

In addition; When HDD such as disk enroll the situation such as the DVD register; Also for TV programme etc. are made video recording for a long time; And the high density recorder that 100～200G degree should be arranged is become standard, dish is to require to carry out high-precision surface grinding gradually to make high flatness person with the surface accuracy of glass substrate.Thus, require to grind the more high-quality person of grainding capacity of material.

In addition, what glass grinding used is of the back with cerium oxide as the grinding material of main component, generally serves as reasons and contains fluorine to improve nonferromagnetic substance.

Be in the grinding material of main component with said cerium oxide, knowing that the particle diameter that for example grinds the material particle is the nonferromagnetic substance that influences the generation etc. of grinding rate, mean roughness (surface smoothness) and scratch or damage (show injuring dives hinders) etc.

For example, Japanese Patent Laid is opened to record in 2000-273443 number specific oversize grain (more than the 6 μ m) is set in below the 300ppm, reduces the number of diving and hindering thus.In addition; Japanese Patent Laid is opened in 2001-72962 number to disclose to be had under about the situation by the colloidal particle of the formed abrasive grains of cerium that is almost pure state; The average aggregate particle size (middle footpath median) of its particles aggregate body is set at (about 0.1～0.5 μ m) less than normal, keeps grinding rate thus and surface roughness is diminished.

In addition, open in 2003-261861 number, be conceived to the low person of grinding material particles aggregate degree of drying regime in Japanese Patent Laid, its favorable dispersibility, proposition characterizes the index of its state of aggregation thus.Also be; In grinding the material particle; Utilize the particle diameter (DN) (particle diameter that is equivalent to primary particle) of the measured grinding material particle of BET method and the grinding material particle of the relation of the satisfied 1＜=DA/DN of the ratio of the particle diameter (DA) (being similar to the particle diameter of agglutination particle) that utilizes the measured grinding material particle of air permeability method＜=10; Be the few and favorable dispersibility in aqueous medium of aggegation, so abrasive characteristic that can be stable.

Yet in the particle diameter of above-mentioned sign grinding material particle or the method for aggegation characteristic, it is the particle diameter of primary particle or the particle diameter of agglutination body particle that Japanese Patent Laid is opened the oversize grain of not distinguishing fully for 2000-273443 number as object; Japanese Patent Laid open 2001-72962 number then regulation the particle diameter (aggregate particle size) of agglutination body particle is arranged, but with above-mentioned agglutination body likewise, do not examine about this agglutination body particle is redispersible in aqueous medium and be the primary particle of which kind of degree.In fact, under drying regime, contain agglutination body particle to a certain degree,, do not have and specially spend time again it is removed to the meaning more than necessary if this agglutination body particle be in aqueous medium, to disperse (or decompose and pulverize) person easily even grind the material particle.According to economic rationality, handle to carry out necessary Min., and to obtain maximum efficiency be good.

In addition, opening the parameter of the demonstration aggegation of being put down in writing for 2003-261861 number about Japanese Patent Laid, is the aggegation degree size (aggegation size) that is merely the grinding material particle that shows drying regime.Therefore, be not dispersion easness or difficulties in dispersion degree (dispersiveness) when directly demonstration is scattered in this particle in the aqueous medium.

Basically, the grinding material used of glass grinding is grinding material particle (abrasive grains) to be scattered in the aqueous medium grind material constituent (also claiming to grind the material slurries) to make when using.At this moment, not only require to promote the productivity of the grinding steps of the keeping of so-called high grinding rate and grinding rate thereof/continuation, also require the two the high levels of productivity and quality of the so-called high-quality level that keeps abradant surface.Yet promoting grinding rate and keeping high-quality is the requirement of the mutual contradiction of symbolic animal of the birth year, is difficult to two and stands.For example can be understood that easily that increase the coarse grain amount of grinding the material grain, then grinding rate accelerates, but the scratch equivalent damage of its abradant surface will increase easily.

Quality aspect about abradant surface; Especially about being aspect the trickle damage of abradant surface of important evaluation object; It before had been the number that just is enough to fully assess the abradant surface damage with the number of show hindering (under the irradiation luminous ray, utilizing the dry abradant surface of microscopic examination and the damage assert).But; As stated, the progress present situation of the electronic industry of the meticulous and big pictureizations of lasting height such as corresponding for example LCD monitor is than background technology; It has reached the level that surpass expection with glass substrate or hard disk with the level that requires of qualities such as glass substrate about liquid crystal, and in continuing to promote.

Along with further requiring the high-quality of its abradant surface,, more require the latent number of hindering of the rigorous assessment of Evaluation Method of the trickle damage of abradant surface except showing the wound certainly.So-called here " dive and hinder " is meant and utilizes thin fluoric acid aqueous solution etching abradant surface; Dried abradant surface damage is made clear; With microscope (for example; Olympus Corp's system is the system metallurgical microscopes, BHT type etc.) observe abradant surface and assert originally hinder indiscoverable trickle damage in the Evaluation Method in above-mentioned showing.The method for evaluation of quality of the more rigorous abradant surface that the number number that thus, requires now to hinder to dive is assessed.

About previous be the grinding material (grinding the material particle) of the dried powder of main component with the cerium oxide; Even if when making coarse grain footpath or agglutination body particle weight in the preferred range that above-mentioned publication communique is disclosed; From glass grinding, continue/continue high grinding rate and reach the latent high-quality aspect of hindering the abradant surface of number of consideration, necessarily do not satisfy the person yet non-belonging to.

The object of the present invention is to provide a kind of glass grinding with grinding material; It is to use at the glass grinding that is Main Ingredients and Appearance especially to grind in the material with the rare-earth oxide that contains cerium oxide; Can keep high grinding rate, and the damage will occur in abrading glass the time, particularly dive and hinder the degree that is not reached before being reduced to; And provide to grinding the material particle, particularly to assessing method for evaluation of quality about powder about the quality of hindering of diving.

Summary of the invention

The object of the present invention is to provide:

[1] a kind of method for evaluation of quality; Be that the assessment glass grinding is with the method for grinding the dispersiveness of material particle in aqueous medium; It is characterized by; Preparation is added into the grinding material particle aqueous medium dispersion liquid that aqueous medium constitutes by the grinding material particle with measured object, to this dispersion liquid irradiation ultrasonic wave, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that (μ m) is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio (being defined as dispersion rate (ξ)) that (μ m) above particle is disappeared through the ultrasonic irradiation effect,

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the specified particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above, V _tBe the above-mentioned α behind the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above).

[2] a kind of glass grinding method; Be to utilize the method for grinding material particle abrading glass; It is characterized by; Preparation is added into the grinding material particle aqueous medium dispersion liquid that aqueous medium constitutes by the grinding material particle with measured object, to this dispersion liquid irradiation ultrasonic wave, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that (μ m) is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio (being defined as dispersion rate (ξ)) that (μ m) above particle is disappeared through the ultrasonic irradiation effect,

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the specified particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above, V _tOn behind the ultrasonic irradiation, state α ₀The particle content (cumulative volume) that (μ m) is above);

Measured dispersion rate ξ is particular value ξ to the method for through type (1) ₀(%) above grinding material particle is adjusted, is selected or differentiates,

And utilize this particular abrasive material particle to carry out glass grinding.

[3] like the glass grinding method of [2], wherein, ξ ₀Be 30 (%).

[4] a kind of glass grinding is with grinding the material constituent, be contain grind the material particle glass grinding with grinding the material constituent, it is characterized by, this grinding material particle does,

To being added into the grinding material particle aqueous medium dispersion liquid irradiation ultrasonic wave that aqueous medium constitutes by grinding the material particle, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that (μ m) is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio (being defined as dispersion rate (ξ)) that (μ m) above particle is disappeared through the ultrasonic irradiation effect,

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the specified particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above, V _tFor behind the ultrasonic irradiation above-mentioned α ₀The particle content (cumulative volume) that (μ m) is above),

The dispersion rate ξ that the method for through type (1) is measured is particular value ξ ₀(%) above grinding material particle is scattered in person in the aqueous medium.

[5] use grinding material constituent like the glass grinding of [4], wherein, ξ ₀Be 30 (%).

[6] the grinding material particle used of a kind of polymolecularity glass grinding is to be the grinding material particle of Main Ingredients and Appearance with the rare-earth oxide that contains cerium oxide, it is characterized by, and this grinds the SO in material ₄The metal sulfate amount that converts be 0.070 (below the mole/Kg), and this grinding material particle does,

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the specified particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above, V _tBe the above-mentioned α behind the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above),

The measured dispersion rate ξ of the method for through type (1) is particular value ξ ₀Grinding material particle (%).

[7] the grinding material particle of using like the polymolecularity glass grinding of [6], wherein, ξ ₀Be 30 (%).

[8] like the grinding material particle of [6] or [7], wherein, contain fluorine compounds.

[9] a kind of glass grinding is characterized by with grinding the material constituent, contains each described grinding material particle in aqueous medium and [6] to [8] at least.

[10] a kind of glass grinding method is characterized by, and uses like the glass grinding of [9] and uses grinding material constituent.

The specific embodiment

Below specify optimal morphology in order to embodiment of the present invention.

(assessment that corase particles amount in the aqueous medium and aggegation are strong and weak)

In the present invention, be described below and carry out using the quality estimating that grinds the dispersiveness of material particle in aqueous medium, grind the aggegation power of material particle and then assess corase particles amount with assessment by agglutination body was constituted through ultrasonic irradiation about glass grinding.

Also promptly, prepare the polishing particles of measured object is added into the grinding material aqueous medium dispersion liquid of aqueous medium, to this aqueous medium dispersion liquid irradiation ultrasonic wave, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that (μ m) is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio (being defined as dispersion rate (ξ)) that (μ m) above particle is disappeared through the ultrasonic irradiation effect.

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

The technical meaning of above-mentioned (1) formula is described below.Also promptly, be that the grinding material particle of Main Ingredients and Appearance is general knownly to constitute its primary particle (so-called here primary particle is meant to be not single crystals, and is actually many crystalline solid particle institute constitutor with the rare-earth oxide that contains cerium oxide.Below all with.) the agglutination body particle of aggegation.In addition; Even this grinding material particle is in the constituent in aqueous medium; Also has particle diameter distribution person; This case inventors etc. are through the result of detailed self-criticism, and finding has in the factor of not little influence in the damage (show and injuring the wound of diving) to abradant surface, and the particle diameter in the grinding material particle in the aqueous medium is at certain value (α ₀) above oversize grain (for example, particle diameter α ₀The particle that=10 μ m are above) atomic (number ppm～hundreds of ppm) content is to belong to important factor.

Usually the grinding material particle of using about glass grinding, average grain diameter is generally about 0.3～3 μ m, and this type of particle diameter 10 μ m are above, particularly the content of the oversize grain (corase particles) about particle diameter 10～50 μ m is denier.

In addition, α ₀Value generally is with employed grinding material particle kind, average grain diameter and as the grinding quality of purpose etc., the value of giving determining experimentally, and grinding material particle used in the present invention be as after state shown in the embodiment, if be set at α ₀=10 μ m then can obtain sufficient result.

Yet, in this should note so-called oversize grain be primary particle this as thick situation outside, also once the agglutination body particle of particles aggregate is thick situation.Then,, find to form in the thick agglutination body particle, in aqueous medium, decompose the most primary particle person of constituent particle easily at the powder state through further self-criticism in detail such as present inventors; Even with because of powerful aggegation in aqueous medium, in fact still can remain on the state of this thick agglutination body particle, and the person that is difficult for being scattered in the primary particle.Also be; Emphasis is not particle diameter or the content that is the agglutination body particle of above-mentioned oversize grain; But be that strong and weak degree of its aggegation (to the easy degree of disintegration or the disintegration degree of difficulty of the primary particle of the agglutination body in the aqueous medium) influences abradant surface quality (show injuring dives hinders) strongly, this necessity of concurrent existing assessment.

Thus; According to present inventor's etc. opinion, be such as the open communique of above-mentioned each patent as the record, only limit the situation that primary particle is a coarse grain merely; Or the particle diameter or the amount of agglutination body particle under the drying regime, the latent quality of hindering degree that can't fully grind the material particle in order to assessment.

(grinding the isolation/concentration method of the corase particles in the material particle)

In the present invention, in order to assess in the aqueous medium power of the corase particles aggegation of grinding the material particle, at first,, the corase particles of gained is carried out the assessment of aggegation power with grinding the corase particles isolation/concentration that institute's trace exists in the material particle.

Grind the isolation/concentration method of the micro-corase particles in the material particle, capable of using in water each sinking speed difference of grinding the particle diameter of material particle carry out.Below its concrete method of narration is routine.

Also promptly, add 200g and grind the material particle in the 10L water of the sodium pyrophosphate that contains 120 (mg/L) (dispersant), and stirring makes it to disperse.After leaving standstill 30 minutes, take out upper clear liquid at leisure.The water that then adds the sodium pyrophosphate that contains 120 (mg/L) again repeats same operation 5 times till recover original liquid capacity.The corase particles that will be piled up in container bottom at last reclaims, and processes dried powder.The particle diameter of this corase particles is about 10 μ m (=α ₀) more than.

If divided by initial grinding material mass particle, containing of the corase particles that grinds in the material particle (in this for more than about 10 μ m) is proportional with calculating with the quality of this corase particles.

(through the strong and weak appraisal procedure of the aggegation of the corase particles of isolation/concentration and the calculating of ξ)

Agglutination body particle of the present invention (particle diameter is the agglutination body particle of 10 μ m) is to be described below to carry out ultrasonic irradiation, contains proportional variation according to the particle of this particle diameter behind the pre-irradiation, and being described below calculates dispersion rate ξ.

Also promptly, above-mentioned corase particles 50mg through isolation/concentration is added in the beaker that 50mL water is housed.Then 1.8L water is added to the ultrasonic irradiation with 2.6L capacity and bathes, and the above-mentioned beaker that water 50mL and corase particles 50mg are housed is flooded wherein.Ultrasonic wave (inferior appearance gulf corporate system, trade name: supersonic wave cleaning machine US-2) shone 10 minutes with frequency 38KHz, output 190W.To the particle before and after the ultrasonic irradiation; With laser light scattering instrument (レ one ザ one analyzer at random: for example; Day machine dress corporate system; Trade name: Mai Keluo opens up gram 9320-X100 type), utilize laser scattering method to measure particle diameter and distribute (volume reference), through type (1) calculates the dispersion rate ξ that ultrasonic irradiation caused of the above particle of particle diameter 10 μ m.

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the specified particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above, V _tBe the above-mentioned α behind the ultrasonic irradiation ₀The particle content (cumulative volume) that (μ m) is above.)

Dispersion rate ξ of the present invention be as after state shown in the embodiment, more than at least 30 (%), above with 50 (%) be good, better more than 70 (%), the above the best of 80 (%).

Therefore, through the measured dispersion rate ξ particular value ξ of the method that will utilize formula (1) ₀The above grinding material particle of for example 30 (%) (%) is adjusted, is selected or differentiates, and is used in glass grinding, then can dive and hinder the grinding that less condition is implemented glass.

(grinding the material particle)

When the main component of representing grinding material particle of the present invention with oxide reduced mass % is formed, then with for example CeO ₂50～65%, La ₂O ₃25～35%, Pr ₆O ₁₁5～6.5%, Nd ₂O ₃0.3～15% degree person is good.Also promptly, so-called by mixed rare earth oxide class particle institute constitutor.

Plain (F) content of fluorine in the grinding material particle of the present invention is to be good with 3～9 quality %, and is better with 5～8 quality %.Plain (F) content of one highest wisdom fluorine is very few, then because of can't be with alkaline lanthana variation/fixedly turn to the lanthanum of fully fluoridizing, so grinding rate is slack-off.Otherwise if fluorine plain (F) is too much, sintering will take place and not good in then superfluous rare earth fluoride class in burning till.

Average grain diameter (the d of grinding material particle of the present invention ₅₀) be to be good with 0.3～3 μ m, and preferable with 0.5～2 μ m, 0.5～1.5 μ m is better.This average grain diameter can be passed through laser scattering method (for example, use a day machine dress society system, laser scattering method, trade name: Mai Keluo are opened up gram 9320-X100 type) and measure.

And then distribute about the particle diameter that grinds the material particle, in cumulative particle size distribution, 10%, 90% particle diameter (μ m) is set at d respectively by small particle diameter ₁₀, d ₉₀The time d ₉₀/ d ₁₀, be good with 15 following persons, with better below 10, best below 5.

About grinding the crystallography rerum natura of material particle; Be in the powder x-ray diffraction analysis gained crest that uses the CuKa ray; The maximum crest (A) of cube brilliant combined oxidation terres rares near 2 θ are 28.3deg, occurs and the crest (B) of fluorine rare earth oxide class near 2 θ are 26.6deg, occurs; The crest height ratio of the B/A of the two crest is good with 0.2～0.8, and is better with 0.3～0.6.

In addition, so-called here " crest height " is expression by the height till baseline to the crest summit of crest curve (following all with).

And about being other rerum naturas of the rare earth oxide class of Main Ingredients and Appearance, be to be described below with the cerium.Crystal particle diameter (according to the Scherrer method) is good with

, and is better with

.

About grinding the pore structure of material particle, be specific area (for example, use Shimadzu Seisakusho Ltd.'s system, the device name: Micro Meritics Flow SorbII 2300 grades are measured) 1～10 (m according to the BET method ²/ g) be good, and with 1.5～6 (m ²/ g) better.

(metal sulfate content)

SO in the grinding material particle of the present invention ₄The metal sulfate content that converts with 0.070 (below the mole/Kg) be good, 0.050 (better below the mole/Kg), 0.035 (the best below the mole/Kg).

In addition, SO of the present invention ₄Analytical method is to dissolve with the aqueous solution that contains nitric acid and hydrogen peroxide to grind the material particle, utilizes induction coupled plasma luminescent spectrum appearance (ICP) to analyze the method for S.

The metallic element of metal sulfate is to be master's material with lanthanum in alkaline-earth metals such as calcium, magnesium, barium or the LREE etc.; Even the sulfate of said element be after the burning till in the step of the grinding material particle manufacturing step stated, fully can thermal decomposition and residual with the form of sulfate yet.

According to the inventor's discovery, SO ₄The amount of the metal sulfate that converts is very relevant with the decomposition easness that grinds material agglutination body particle.

This is to be considered to because burn till in the step above-mentioned, when the sulfate of said element has above-mentioned specified quantitative when above, causes more weak sintering through the agglutination body particle that burns till processing, so the increase of the aggegation intensity of agglutination particle.In addition; If this sulfate is more than the specified quantitative; Then the mechanicalness intensity of agglutination body particle increases; So under will grinding the situation that the material agglutination particle is dispersed in the aqueous medium and use, under the mechanical forces such as shearing force of utilizing the agglutination particle that puts on when grinding, will become is difficult for pulverizing or dispersion, so this agglutination body is considered to the phenomenon that occurs becoming and be difficult to decompose.In addition, SO ₄The amount of the metal sulfate that converts be according to above-mentioned viewpoint and with a small amount of for good, but need not to remove fully, by the viewpoint speech of reaching the object of the invention, be adjusted into below the above-mentioned numerical value promptly enough fully.

Then; As after state shown in the embodiment as; For example, be made as 0.070 through amount and (below the mole/Kg), then can guarantee more than dispersion rate ξ=30 (%) metal sulfate; Further being made as 0.050 through the amount with metal sulfate (below the mole/Kg), then can guarantee more than dispersion rate ξ=50 (%).

(grinding the manufacturing of material particle)

Grinding material, particularly dispersion rate of the present invention (ξ) are according to being described below the method manufacturing for the grinding material particle of defined scope of the present invention.

Of the present invention is that the grinding material raw material of Main Ingredients and Appearance is mainly by rear earth containing ore manufacturings such as bastnaesite (bastnaesite), monazite (monazite), xenotime (xenotime), Chinese complicated ore with the cerium oxide, is not defined in said material certainly.

At first; After said rear earth containing ore carried out ore dressing, obtain terres rares concentrate such as bastnaesite concentrate, monazite concentrate, Chinese complicated ore, the terres rares concentrate of gained is carried out chemical treatment; With unnecessary mineral such as removal radioactive elements; And carry out precipitating, filtering after solvent extracts out the existing used step of burning till etc. through combination more according to circumstances; And obtain belonging to the cerium oxide is the grinding material raw material of main component, like carbonated rare earth class, rare earth oxide class, hydroxylation terres rares, rare earth fluoride class etc.

In addition, be the rare earth fluoride time-like, be generally fluoric acid is added in the rare earth chloride class aqueous solution that the deposition that makes the rare earth fluoride class generates and the method made.

The manufacturing approach of preferable grinding material particle of the present invention example is heating and decomposition carbonated rare earth class, with the rare earth oxide class and the method for rare earth fluoride class as initiation material of gained, is not to be defined in the method still.

Also promptly, containing under the oxygen atmosphere, the carbonated rare earth class that at first will obtain from above-mentioned tcrude ore carry out under 400～840 ℃ 30 minutes～48 hours, be preferably burning till about 1～24 hour (pre-burning one-tenth), and carry out heating and decomposition and make the rare earth oxide class.So, be not to make the carbonated rare earth class directly burn till (main burning till), state the low temperature of main firing temperature after the utilization and carry out pre-burning one-tenth and make rare earth oxide class person, be one of preferred steps.In addition, also can in this rare earth oxide class remnant carbonated rare earth class.

, burn till (pre-burning one-tenth) carbonated rare earth class here, as the mixture of resulting rare earth oxide class and carbonated rare earth class, full rare-earth oxide reduced mass (TREO) is good with 50～97 quality %, and preferable with 70～95 quality %, 80～93 quality % are better.

On the other hand, about the rare earth fluoride class, general preferably use as above-mentioned as the method for making that fluoric acid is added in the rare earth chloride class aqueous solution, the deposition of rare earth fluoride class is generated, but be not limited thereto certainly.

Rare earth oxide class about becoming through pre-burning is described below, and carries out the interpolation of rare earth fluoride class, the liquefaction of raw material mixed pulp, case of wet attrition, drying usually, burns till, decomposes steps such as pulverizing, classification.

At first, add the rare earth fluoride class to becoming in the rare earth oxide class of gained through above-mentioned pre-burning.The addition of rare earth fluoride class is that final gained grinds content in the material particle as as narrating, for (F) conversion amount is good to form 3～9 quality %, with 5～8 quality % better (rare earth fluoride interpolation step).

So add the rare earth fluoride class in the rare earth oxide class after; Adding the water mixing is the slurries of 30～60 quality % to process solid shape branch concentration; These slurries are carried out the case of wet attrition about 1～10 hour, and making particle diameter is the slurries that particle constituted (raw material mixed pulp liquefaction step, case of wet attrition step) about 0.2～10 μ m.

Then should be behind the slurries of case of wet attrition in drying, burn till containing under the oxygen atmosphere.This burns till with respect to above-mentioned pre-burning; Burn till and be called the master; As firing condition be with the intensification temperature of heating-up temperature more than 500 ℃ is made as 0.3～5 (℃/min), keep high temperature as 850～1100 ℃, and make retention time in this high temperature range be 0.5～6 hour for good.

And then, as firing condition be preferably the programming rate of heating-up temperature more than 500 ℃ is made as 0.5～3.5 (℃/min), the high temperature of maintenance is made as 900～1000 ℃, and the retention time in this high temperature range is made as 2～5 hours.

As pre-burning becomes or the main burning apparatus that burns till in order to implement; If accommodate above-mentioned pulverizing/dried feed, heat up and keep this high temperature and burn till with this temperature of stipulating; Then any type of stove all can, for example, the box-type furnace of applicable batch or continous way, revolving burner, car tunnel furnace etc.; In addition, the applicable electrical heating type of heating means, naked light heated type (fuel is gas or fuel wet goods) any (drying steps, burn till step).

After so burning till, decompose pulverizing, carry out classification, get final product to such an extent that have a grinding material particle (decomposing pulverising step, classification step) of specifying particle size range according to expectation.

In addition, also can adopt following method, be to use the carbonated rare earth class as raw material in order to replace as the rare earth oxide class and the rare earth fluoride class of above-mentioned modulation respectively and give the mixer, it is partially fluorinated to utilize the fluoric acid aqueous solution that this part is carried out.Under the situation of this method for making, add water in the carbonated rare earth class and carry out slurried, in this add hydrogen fluoride carry out partially fluorinated, and with this with carrying out case of wet attrition, drying as above-mentioned, burning till, decompose steps such as pulverizing, classification and get final product.

(adjustment of metal sulfate content)

The present invention is as stated, as grinding existing SO in the material particle ₄The metal sulfate content that converts be 0.070 (below the mole/Kg), with 0.050 (below the mole/Kg) be good, with 0.035 (mole/better below Kg).

Make and grind existing SO in the material particle ₄The metal sulfate content that converts does not have special qualification, and can adopt such as following method when above-mentioned scope.Also promptly, it be the mode in the afore mentioned rules scope that the first is used the purity as the light rare earth class raw material of raw material with modulation, makes the SO in the gained grinding material ₄Conversion content is in above-mentioned scope.Perhaps, adopt to utilize use as the light rare earth class raw material of raw material and obtain SO ₄Behind the little raw material of conversion content; In making the step of grinding in the material particle way, will allocate in advance/coexist through the metal sulfates such as alkaline-earth metal (for example, calcium sulfate, magnesium sulfate etc.) of adjustment addition; And use chatted and manufacturing step, will grind existing SO in the material particle ₄The means that conversion content is adjusted in the above-mentioned preferred range also can.

(grinding the pH of material composition, slurries etc.)

In the present invention, using grinding material particle with the aqueous slurry pattern, about the pH of this aqueous slurry, is solid shape branch concentration 10 quality % aqueous slurry pH at room temperature, is good with 6.0～9.0, and 6.2～8.0 is better, 6.5～7.5 the bests.

In addition, better for making in aqueous medium dispersion of nano-particles property in grinding material slurries of the present invention, for example also can adding, organic polymer such as polymeric polycarboxylic acid ammonium salt or polyphosphazene polymer ichthyodin is dispersant and uses.In addition, SO ₄Analytical method be as as explaining, the aqueous solution that contains nitric acid and hydrogen peroxide for utilization dissolves and grinds the material particle, and usability answers coupled plasma luminescent spectrum appearance (ICP) to analyze S (light-emitting line wavelength: method 180.731nm).

(effect of invention)

According to the present invention; Be with grinding material at glass grinding; Being in particular with the rare-earth oxide that contains cerium oxide is in the glass grinding usefulness grinding material of Main Ingredients and Appearance; Can provide and keep high grinding rate, and the damage that produces can reduce abrading glass time the (particularly dive and hinder) to from the glass grinding of the degree that do not had with the grinding material.In addition,, can provide, particularly assess method for evaluation of quality really about powder about the quality of hindering of diving to grinding the material particle according to the present invention.

In addition; In the milling apparatus of reality; Grinding material constituent of the present invention is to use as grinding material aqueous medium dispersion liquid (the so-called material slurries that grind); Using should grind the material slurries time, confirm to be attended by the outer effect of expection, be significantly to reduce the accumulation that formerly becomes in the slurries of the problem stream because of sedimentation caused.

Embodiment

Below through embodiment the present invention is described.But it is merely embodiment, is not in order to limit explainable technical scope of the present invention.In addition, under situation about not specifying, % is meant quality %.

Embodiment 1

(grind the SO in the material particle ₄Content is 0.015 (mole/Kg) (=0.144 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.063 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite (mullite) system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.5 quality %, SO ₄The rare earth oxide class of content 0.063 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.125 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.This slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(iii) be placed on the pallet drying of using the box drying machine under 120 ℃, to carry out 20 hours through the slurries after the case of wet attrition.Dried powder is inserted in the small-sized container for evaporation (mullite system), under air ambient, burns till.Also promptly, make the rate of warming of heating-up temperature more than 500 ℃ with 2.3 (℃/min) remain high temperature to 950 ℃, and keep burning till in 3.0 hours with said temperature.Powder after burning till is after decomposing pulverizing with the decomposition pulverizer, to use air classifier to carry out classification, and obtain grinding material particle 14.0kg.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.3 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂62.1%, La ₂O ₃30.4%, Pr ₆O ₁₁6.5%, Nd ₂O ₃1.0% and fluorine composition (F) content be 5.7%.In addition, SO ₄Content is 0.015 (mole/Kg) (=0.144 quality %).

(ii) average grain diameter (d ₅₀) be 0.95 μ m (through laser light scattering instrument (day machine dress corporate system, trade name: the wheat Caro is told La Gu, the 9320-X100 type), and measure with laser scattering method).In addition, the measurement of particle diameter distribution is to carry out with same procedure with following embodiment and comparative example.

In addition, distributing about particle diameter is in the accumulation particle diameter distributes, and the particle diameter (μ m) that is begun respectively 10%, 90% by small particle diameter is made as d ₁₀, d ₉₀The time, d ₉₀/ d ₁₀Be 3.2.

(iii) the analysis result of X-ray diffraction spectrum of the use powder x-ray diffraction device of this particle (triumphant cluck the corporate system of grain, CuKa ray, Rint-2000 type, following embodiment and comparative example all with) is to be described below.

The maximum crest (A) of cube brilliant combined oxidation terres rares occurs near 2 θ are 28.3deg, and (in addition, in following embodiment and comparative example, it is rough identical that 2 θ appear in the crest of the two) appears in the crest (B) of oxygen rare earth fluoride class near 2 θ are 26.6deg.Ratio (B/A) with respect to the crest height of the crest height (B) of crest height (A) is 0.49.

In addition, in X-ray diffraction analysis is measured, do not confirm the crystallization crest of cerium fluoride fully.

(iv) in addition, other rerum naturas of this particle are to be described below.

A) crystallization footpath (Scherrer method) is

B) by the specific area of the BET method gained of particle (Shimadzu Seisakusho Ltd.'s system, measured according to device name Micro Meritics Flow SorbII 2300, following embodiment and comparative example all with) be 2.8 (m ²/ g).

C) aqueous slurry of this particle (Gu shape concentration 10 quality %, following embodiment and comparative example all with) pH be 7.0.

D) about particle diameter 10 μ the m (=α of the damage that can influence the glass grinding face especially ₀) above particle; When assessing its compendency strong and weak; Grind the isolation/concentration of corase particles in the material particle through following method; Making this corase particles be scattered in the water and shine ultrasonic wave, decompose the dispersion rate ξ of pulverizing/dispersion through ultrasonic irradiation, is to be tried to achieve through (1) formula by the distribute variation of (volume reference) of the particle diameter before and after the ultrasonic irradiation.

The isolation/concentration of corase particles is to carry out (following embodiment and comparative example all with) as following according to the method explained in the grinding material particle here.Also promptly, will grind material particle 200g and make an addition among the water 10L that contains 120 (mg/L) sodium pyrophosphate (dispersant), and stir also and disperse, leave standstill 30 minutes after, slowly take out upper clear liquid.Then add the water that contains 120 (mg/L) sodium pyrophosphate again till get back to original liquid capacity, and carry out repeatedly 5 times with same operation.The final corase particles that is piled up in container bottom that reclaims, and will make dried powder.

This corase particles 50mg through isolation/concentration is added in the beaker that water 50mL is housed.Next, in the ultrasonic irradiation that the 2.6L capacity is arranged is bathed, add entry 1.8L, and this beaker impregnated in wherein.The use sono-cleaner (inferior knowledge Wang corporate system, trade name: sono-cleaner US-2), the ultrasonic wave of irradiation frequency 38KHz, power output 190W 10 minutes.

About the particle before and after the ultrasonic irradiation; (for example, day machine is adorned corporate system, and trade name: the wheat Caro is told La Gu through laser light scattering instrument; The 9320-X100 type); And measure particle diameter with laser scattering method and distribute (volume reference), the dispersion rate ξ with the ultrasonic irradiation gained of the particle more than the particle diameter 10 μ m can try to achieve according to (1) formula.

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

(in the formula, V ₀Be the particle diameter α before the ultrasonic irradiation ₀The particle content (cumulative volume) that (=10 μ m) is above, V _tBe the above-mentioned α behind the ultrasonic irradiation ₀The particle content (cumulative volume) that (=10 μ m) is above.)

The dispersion rate ξ with the ultrasonic irradiation gained of the particle more than the particle diameter 10 μ m that is tried to achieve with said method is 78%.

(grinding test)

Grinding test is to carry out (following embodiment and comparative example all with) with following method/condition.

Rub tester is to use Wal Duo Lapu corporate system, two surface grinding WS-6PB types.Be used in the alkali-free glass that is to use the Asahi Glass corporate system by the abrading glass plate (trade name: AN-100, the SiO during glass is formed of grinding ₂Content is about 60 quality %, breadboard size (square): 70mm/70mm/0.7mm).

Grinding pad is to use polyurathamc system, and grinding pressure is 92 (g/cm ₂), will descend price fixing rotation number to be fixed as 70rpm, and the rotation percentage of above price fixing and following price fixing is under 1: 3 the condition, to carry out grinding test.The grinding material concentration of grinding in the material slurries is 20 quality %.

(appraisal procedure of the damage of abradant surface (dive and hinder))

The appraisal procedure of the trickle damage of the glass surface after grinding is to carry out (following embodiment and comparative example all with) with following method.

With in the concentration 0.1 quality %HF aqueous solution of glass-impregnated in being placed in the resin gasket after grinding 30 seconds.After picking up glass plate and fully clean with tweezers, that glass plate is dry with pure water.

Then, utilize dark-field microscope (continuous heavy rain Bath corporate system difficult to understand is the system metallurgical microscopes, BHT type, 100 times) to observe and the surface of assessment glass through grinding.

Glass after grinding is carried out following 3 stages assessment, all do not have macrolesion or trickle wound then for suitable about the wound of diving.

[assessment of dive hindering: assess (following embodiment and comparative example all with) with following 3 stages]

◎: Quan Weijian has macrolesion or trickle wound, is the preceding degree person who does not reach, and is judged as the utmost point and is suitable for as grinding material.

Zero: not seeing has macrolesion, but the state of the trickle wound of only a few is arranged, and is to have suitable level person, is judged as to be suitable for as grinding material.

*: though almost there is not macrolesion, most trickle wounds are arranged, be judged as and be not suitable as the grinding material.

(result of the test)

Grind the SO in the material ₄The dispersion rate ξ of conversion content, ultrasonic irradiation, the assessment result of the glass surface behind the grinding test are to be shown in table 1.

Embodiment 2

(grind the SO in the material particle ₄Content is 0.021 (mole/Kg) (=0.202 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.089 quality %] 45kg inserts in the small-sized container for evaporation (mullite system) as raw material, under air ambient, carries out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtains full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 0.192 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.175 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(iii) be placed on the pallet drying of using the box drying machine under 120 ℃, to carry out 20 hours through the slurries after the case of wet attrition.Dried powder is inserted in the small-sized container for evaporation (mullite system), under air ambient, burns till.Also promptly, make the rate of warming of heating-up temperature more than 500 ℃ with 2.3 (℃/min) remain high temperature to 950 ℃, and keep burning till in 3.0 hours with said temperature.Powder after burning till is after decomposing pulverizing with the decomposition pulverizer, to use air classifier to carry out classification, and obtain grinding material particle 13.8kg.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.7 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂62.1%, La ₂O ₃30.4%, Pr ₆O ₁₁6.5%, Nd ₂O ₃1.0% and fluorine composition (F) content be 5.9%.In addition, SO ₄Content is 0.021 (mole/Kg) (=0.202 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 3.8.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.50.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 3.0 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.1.

To assess the dispersion rate ξ of the ultrasonic irradiation of the above particle of 10 μ m with embodiment 1 identical method.

The assessment of glass grinding test and grinding back glass surface is to assess with embodiment 1 identical method.Grind the SO in the material ₄The dispersion rate ξ of conversion content, ultrasonic irradiation, the assessment result of the glass surface behind the grinding test are to be shown in table 1.

Embodiment 3

(grind the SO in the material particle ₄Content is 0.045 (mole/Kg) (=0.432 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.190 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 0.192 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.375 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(iii) be placed on the pallet drying of using the box drying machine under 120 ℃, to carry out 20 hours through the slurries after the case of wet attrition.Dried powder is inserted in the small-sized container for evaporation (mullite system), under air ambient, burns till.Also promptly, make the heat temperature of heating-up temperature more than 500 ℃ with 2.3 (℃/min) remain high temperature to 950 ℃, and keep burning till in 3.0 hours with said temperature.Powder after burning till is after decomposing pulverizing with the decomposition pulverizer, to use air classifier to carry out classification, and obtain grinding material particle 14.1kg.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.5 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂61.2%, La ₂O ₃31.9%, Pr ₆O ₁₁6.0%, Nd ₂O ₃0.9% and fluorine composition (F) content be 5.7%.In addition, SO ₄Content is 0.045 (mole/Kg) (=0.432 quality %).

(ii) average grain diameter (d ₅₀) be 0.95 μ m.

In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 4.2.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.45.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.8 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.0.

Embodiment 4

(grind the SO in the material particle ₄Content is 0.010 (mole/Kg) (=0.096 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.042 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 0.192 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.083 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(iii) be placed on the pallet drying of using the box drying machine under 120 ℃, to carry out 20 hours through the slurries after the case of wet attrition.Dried powder is inserted in the small-sized container for evaporation (mullite system), under air ambient, burns till.Also promptly, make the rate of warming of heating-up temperature more than 500 ℃ with 2.3 (℃/min) remain high temperature to 950 ℃, and keep burning till in 3.0 hours with said temperature.Powder after burning till is after decomposing pulverizing with the decomposition pulverizer, to use air classifier to carry out classification, and obtain grinding material particle 13.9kg.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.5 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂61.2%, La ₂O ₃31.9%, Pr ₆O ₁₁6.0%, Nd ₂O ₃0.9% and fluorine composition (F) content be 5.7%.In addition, SO ₄Content is 0.010 (mole/Kg) (=0.096 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 5.0.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.44.In addition, in X-ray diffraction analysis is measured, do not confirm the crystallization crest of cerium fluoride fully.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.7 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.1.

Embodiment 5

(grind the SO in the material particle ₄Content is 0.003 (mole/Kg) (=0.029 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.013 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 0.192 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.025 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.4 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂61.1%, La ₂O ₃31.9%, Pr ₆O ₁₁6.0%, Nd ₂O ₃1.0% and fluorine composition (F) content be 5.6%.In addition, SO ₄Content is 0.003 (mole/Kg) (=0.029 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.

In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 3.5.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.44.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.9 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.1.

Embodiment 6

(grind the SO in the material particle ₄Content is 0.070 (mole/Kg) (=0.672 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.296 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 0.640 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.584 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(iii) be placed on the pallet drying of using the box drying machine under 120 ℃, to carry out 20 hours through the slurries after the case of wet attrition.Dried powder is inserted in the small-sized container for evaporation (mullite system), under air ambient, burns till.Also promptly, make the rate of warming of heating-up temperature more than 500 ℃ with 2.3 (℃/min) remain high temperature to 950 ℃, and keep burning till in 3.0 hours with said temperature.Powder after burning till is after decomposing pulverizing with the decomposition pulverizer, to use air classifier to carry out classification, and obtain grinding material particle 14.1kg.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.7 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂63.0%, La ₂O ₃29.9%, Pr ₆O ₁₁6.0%, Nd ₂O ₃1.1% and fluorine composition (F) content be 5.6%.In addition, SO ₄Content is 0.070 (mole/Kg) (=0.672 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.

In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 3.8.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.47.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.7 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.1.

Comparative example 1

(grind the SO in the material particle ₄Content is 0.085 (mole/Kg) (=0.816 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.359 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.5 quality %, SO ₄The rare earth oxide class of content 0.774 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 0.709 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.6 quality %, be CeO with respect to the quality ratio of above-mentioned each oxide of TREO ₂63.0%, La ₂O ₃29.8%, Pr ₆O ₁₁6.1%, Nd ₂O ₃1.1% and fluorine composition (F) content be 5.6%.In addition, SO ₄Content is 0.085 (mole/Kg) (=0.816 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 4.0.

(iii) the crest height ratio (B/A) with respect to the crest height (B) of crest height (A) is 0.47.In addition, in X-ray diffraction analysis is measured, do not confirm the crystallization crest of cerium fluoride fully.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.9 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.0.

Comparative example 2

(grind the SO in the material particle ₄Content is 0.160 (mole/Kg) (=1.536 quality %))

(grinding the modulation of material particle)

(i) homemade carbonated rare earth class [full rare-earth oxide reduced mass (TREO) 42 quality %, CeO in the use ₂/ TREO 60 quality %, SO ₄Content 0.676 quality %] 45kg is as raw material; Insert in the small-sized container for evaporation (mullite system); Under air ambient, carry out 2 hours burn till (pre-burning one-tenth) with 750 ℃ of heating-up temperatures, obtain full rare-earth oxide reduced mass (TREO) 90.8 quality %, SO ₄The rare earth oxide class of content 1.461 quality % is burnt till article.

(ii) follow, weigh above-mentioned burn till article 16kg with in homemade rare earth fluoride class [full rare-earth oxide reduced mass (TREO) 83 quality %, CeO ₂/ TREO 61 quality %, F content 25 quality %, SO ₄Content 1.335 quality %, average grain diameter 10 μ m] 5.0kg, and the two is inserted in the tank diameter that water 27.2kg is housed, stir and process slurries.Then, this slurries circulation is supplied to the wet crushing mill that uses the crushing medium ball, carries out about 5 hours case of wet attrition, make particle diameter be ground into 0.2～6 μ m.

(particle is formed and all physics values)

(i) when representing this composition that grinds the material particle with oxide reduced mass %, be TREO (=CeO ₂+ La ₂O ₃+ Nd ₂O ₃+ Pr ₆O ₁₁) 95.3 quality %, be CeO with respect to the quality ratio of stating each oxide on the TREO ₂62.0%, La ₂O ₃30.5%, Pr ₆O ₁₁6.5%, Nd ₂O ₃1.0% and fluorine composition (F) content be 5.6%.In addition, SO ₄Content is 0.160 (mole/Kg) (=1.536 quality %).

(ii) average grain diameter (d ₅₀) be 0.93 μ m.

In addition, distribute d about particle diameter ₉₀/ d ₁₀Be 3.8.

A) crystallization footpath (Scherrer method) is

B) specific area by the BET method gained of particle is 2.8 (m ²/ g).

C) pH of the aqueous slurry of this particle is 7.0.

Table 1

	Grind the SO in the material particle ₄Conversion content (mole/Kg)	The 10 μ m above dispersion of nano-particles rate ξ (%) of ultrasonic irradiation	The quality estimating of the lapped face after the grinding (3 stage)
				Embodiment 1	0.015	78	◎
Embodiment 2	0.021	69	◎
				Embodiment 3	0.045	51	◎
Embodiment 4	0.010	81	◎
				Embodiment 5	0.003	86	◎

Embodiment 6	0.070	36	○
				Comparative example 1	0.085	22	×
Comparative example 2	0.160	13	×

In addition; In the table 1 the grinding rate grade of the grinding material of comparative example 1 be set at beautify clearly the corresponding article of the high-speed speed of learning corporate system (trade name: the grade that land miaow nox TE-303) is as the criterion, the embodiment 1～6 in the table, the grinding rate of comparative example 2 be already with comparative example 1 as benchmark and maintain rough therewith identical high-grade.

(utilizability on the industry)

According to the present invention; Can provide a kind of glass grinding with grinding material; Be to use at the glass grinding that is Main Ingredients and Appearance especially to grind in the material with the rare-earth oxide that contains cerium oxide; Fully keep this grinding rate can with the high grinding rate ad eundem of previous gained, and the degree that do not reached before being reduced to of the latent wound will occur in abrading glass the time.

In addition,, can provide, particularly assess method for evaluation of quality really about powder about the quality of hindering of diving to grinding the material particle according to the present invention.

In addition; According to the present invention; In the milling apparatus of reality, when using grinding material particle of the present invention, be accompanied by the exhausted big effect outside the expection as grinding material aqueous medium dispersion liquid; It is can significantly reduce formerly to become in the slurries of the problem stream because of the accumulation that sedimentation caused, so the utilizability on industry is very big.

Claims

1. one kind is reduced the glass grinding method of diving and hindering, and utilizes and grinds material particle abrading glass, it is characterized by, and from this grinding material particle, reclaims the α that isolation/concentration obtains that passes through in the water that contains dispersant ₀The oversize grain that μ m is above; This oversize grain is dispersed in the water; With the ultrasonic irradiation dispersion liquid of frequency 38KHz, output 190W, it is 1 particle that the agglutination body particle in this oversize grain is disintegrated, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that μ m is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio that the above particle of μ m is disappeared through the ultrasonic irradiation effect is dispersion rate ξ:

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

In the formula, V ₀For with the specified particle diameter α before the ultrasonic irradiation ₀The content that the cumulative volume of the particle that μ m is above is represented, V _tFor with the above-mentioned α behind the ultrasonic irradiation ₀The content that the cumulative volume of the particle that μ m is above is represented;

This particle diameter α is represented in the measured conduct of method to through type (1) ₀The dispersion rate ξ of the power property index of the aggegation of the oversize grain that μ m is above is particular value ξ ₀Above grinding material particle is adjusted, is selected or differentiates;

2. glass grinding method according to claim 1, wherein, ξ ₀Be 30%.

3. a glass grinding of reduce to dive hindering contains and grinds the material particle with grinding the material constituent, it is characterized by, and this grinding material particle is,

From this grinding material particle, reclaim the α that isolation/concentration obtains that passes through in the water that contains dispersant ₀The oversize grain that μ m is above; This oversize grain is dispersed in the water; With the ultrasonic irradiation dispersion liquid of frequency 38KHz, output 190W, it is 1 particle that the agglutination body particle in this oversize grain is disintegrated, and measure by shown in the formula (1) with respect to the specified particle diameter α before this ultrasonic irradiation ₀The particle content that μ m is above, the above-mentioned α behind the ultrasonic irradiation ₀The ratio that the above particle of μ m is disappeared through the ultrasonic irradiation effect is dispersion rate ξ:

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

In the formula, V ₀For with the specified particle diameter α before the ultrasonic irradiation ₀The content that the cumulative volume of the particle that μ m is above is represented, V _tFor with the above-mentioned α behind the ultrasonic irradiation ₀The content that the cumulative volume of the particle that μ m is above is represented; And

With the method for through type (1) measured as representing this particle diameter α ₀The dispersion rate ξ of the power property index of the aggegation of the oversize grain that μ m is above is particular value ξ ₀Above grinding material particle is adjusted, is selected or differentiates;

Making dispersion rate ξ is particular value ξ ₀Above grinding material particle is scattered in the aqueous medium and gets.

4. glass grinding according to claim 3 is used and is ground the material constituent, wherein, and ξ ₀Be 30%.

5. one kind is reduced the grinding material particle that latent polymolecularity glass grinding of hindering is used, and is Main Ingredients and Appearance with the rare-earth oxide that contains cerium oxide, it is characterized by, and this grinds the SO in material ₄The metal sulfate amount that converts be 0.070 mole/below the Kg, and this grinding material particle is,

ξ＝[(V ₀-V _t)/V ₀]×100(％) (1)

This particle diameter α is represented in the measured conduct of method of through type (1) ₀The dispersion rate ξ of the power property index of the aggegation of the oversize grain that μ m is above is particular value ξ ₀Above grinding material particle is adjusted, is selected or differentiates.

6. the grinding material particle that polymolecularity glass grinding according to claim 5 is used, wherein, ξ ₀Be 30%.

7. according to claim 5 or 6 described grinding material particles, wherein, contain fluorine compounds.

8. a glass grinding is characterized by with grinding the material constituent, contains each described grinding material particle in aqueous medium and the claim 5 to 7 at least.

9. a glass grinding method is characterized by, and uses the described glass grinding of claim 8 with grinding the material constituent.