CN109665823A - A kind of preparation method of the high stability refractory material for precious metal smelting - Google Patents

A kind of preparation method of the high stability refractory material for precious metal smelting Download PDF

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CN109665823A
CN109665823A CN201910039041.4A CN201910039041A CN109665823A CN 109665823 A CN109665823 A CN 109665823A CN 201910039041 A CN201910039041 A CN 201910039041A CN 109665823 A CN109665823 A CN 109665823A
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parts
refractory material
preparation
oxide
precious metal
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万思露
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Fuyang Jiapai Productivity Promotion Center Co Ltd
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Fuyang Jiapai Productivity Promotion Center Co Ltd
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Abstract

The invention discloses a kind of preparation method of high stability refractory material for precious metal smelting, include the following steps: that (1) raw material weighs spare, (2) low temperature calcination processing, (3) preprocessing processing, the processing of (4) base, the preparation of (5) finished product.The present invention has carried out reasonable Optimal improvements to the preparation for processing of refractory material, its integrated artistic is reasonable, step is simple, it is easy to promote and utilize, refractory material obtained has good flexibility, thermal shock resistance, slag-resistant aggressivity, melt erosion resistant to high temperatures, melt permeability resistant to high temperatures and lower linear expansivity etc., and its Cr2O3Content further decreases, conducive to the protection of environment, on Trend of Chrome-free direction again huge step, the great market competitiveness and produce and use benefit.

Description

A kind of preparation method of the high stability refractory material for precious metal smelting
Technical field
The invention belongs to metal smelt technical fields, and in particular to a kind of high stability fire resisting for precious metal smelting The preparation method of material.
Background technique
Existing pyrogenic process precious metal smelting kiln largely uses magnesite-chrome brick, and magnesite-chrome brick has good resistance slag corrosion Can, but flexibility is poor, often occurs phenomena such as structure spalling and fracture in use process, and magnesite-chrome brick is resisted high-temperature fusant and washed away There cannot be better raising with the performance of infiltration, up to the present Cr2O3Magnesite-chrome brick of the content between 16 ~ 24% is still that pyrogenic process is expensive More common refractory material in metal smelt.
Existing technology is that refractory Cr-Al material and aluminum chromium zirconia fire resistive material are applied to pyrogenic process precious metal smelting kiln In furnace, Cr-Al material and aluminum chromium zirconia fire resistive material start using chromium slag as primary raw material, use corundum and chrome ore instead gradually to make, Principle is to form Al2O3-Cr2O3Solution altogether, due to being burnt into using the kiln of falling cigarette, sintering degree is abundant.Therefore, Cr-Al material fire proofed wood It is excellent to resist high-temperature fusant performance of flushing for material and aluminum chromium zirconia fire resistive material elevated temperature strength with higher, but your gold it resists The performance for belonging to smelting slag corrosion cannot obtain good improvement.And its flexibility and thermal shock resistance are no more than magnesite-chrome brick, lead Cause to occur as soon as phenomenon of rupture in the shorter period, influences the service life of kiln, while Cr-Al material and aluminum chromium zirconia fire resisting Material uses the production cycle of the kiln of falling cigarette firing usually at 15 ~ 20 days, production cycle 6 ~ 7 days be significantly larger than burnt into tunnel oven, And it is low with the kiln of the falling cigarette production thermal efficiency, pollute environment.
Increasingly strict with environmental requirement, refractory material Trend of Chrome-free is a kind of inexorable trend, is smelted in steel and cement Refractory material Trend of Chrome-free has been achieved with larger progress in technique, but since refractory consumption amount is less in precious metal smelting, smelts Melt infiltration ability is stronger in the process, and slag is very serious to deteriorating for refractory material, steady to the flexibility of refractory material, thermal shock Melt performance of flushing qualitative, resistant to high temperatures and the performance requirement for resisting slag corrosion are higher, therefore, the Cr in reducing refractory material2O3 While content, service life further increase be pyrogenic process precious metal smelting refractory material developing direction.Such as application No. is: A kind of pyrogenic process precious metal smelting flexibility composite spinelle tin refractory material disclosed in CN201410583333.1, wherein passing through Whole use quality is optimized to the adjustment improvement of material composition, reduces Cr2O3Usage amount, but with people for produce The continuous promotion that product require, this material are also slowly unable to satisfy actual process requirements, still need to further enhance.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of high stability fire resisting for precious metal smelting is provided The preparation method of material.
The present invention is achieved by the following technical solutions:
A kind of preparation method of the high stability refractory material for precious metal smelting, includes the following steps:
(1) raw material weighs spare:
It is spare that following raw materials according is weighed by corresponding parts by weight: 45 ~ 50 parts of dense alumina sand, 5 ~ 8 parts of chromium slags, 12 ~ 15 parts of magnesia, 2 ~ 3 Part chrome green, 1 ~ 3 part of zirconium oxide, 0.2 ~ 0.8 part of manganese oxide, 3 ~ 6 parts of calcium oxide, 0.3 ~ 0.5 part of rare earth oxide, 0.5 ~ 1 part of oxygen Change secret, 4 ~ 8 parts of binders；
(2) low temperature calcination is handled:
First dense alumina sand, chromium slag, magnesia are put into progress low temperature calcination processing in calcining furnace jointly, during which controls calcining furnace Interior heating rate is that 30 ~ 40 DEG C/min takes out after 35 ~ 40min of isothermal holding after rising to 780 ~ 830 DEG C in calcining furnace Mixture A is spare；
(3) preprocessing is handled:
The resulting mixture A of step (2) and the weighed chrome green of step (1), zirconium oxide, manganese oxide, calcium oxide are mixed jointly, so After be put into vacuum chamber, then into vacuum chamber add above-mentioned substance gross mass 6 ~ 8% epoxidized soybean oil, then to vacuum chamber Vacuumize process is carried out, is during which constantly stirred, to carrying out pressurized treatment in vacuum chamber after 25 ~ 30min, pressure maintaining processing 1 ~ Taken out after 1.5h mixture B is spare；
(4) base is handled:
By the resulting mixture B of step (3) and the weighed rare earth oxide of step (1), oxidation is secret, binder be added to jointly it is mixed Mixing treatment is carried out in material machine, takes out to obtain mixture C after 1 ~ 2h, and mixture C is then put into maintenance under normal temperature condition and is handled 16 ~ 20h finally puts it into again and suppresses base in mold, and it is spare to obtain adobe；
(5) prepared by finished product:
Adobe made from step (4) is put into high temperature kiln and is fired processing, takes out and gets product after 2 ~ 3h of firing.
Further, the granular size of dense alumina sand as described in step (1) is 0.05 ~ 0.2mm；The chromium slag Granular size is 0.05 ~ 0.15mm；The granular size of the magnesia is 0.01 ~ 0.05mm；The granular size of the chrome green For 0.015 ~ 0.025mm；The granular size of the zirconium oxide is 0.015 ~ 0.035mm；The granular size of the manganese oxide For 0.005 ~ 0.025mm；The granular size of the calcium oxide is 0.02 ~ 0.2mm.
Further, rare earth oxide as described in step (1) is lanthana, cerium oxide, any one in yttrium oxide.
Further, binder as described in step (1) is by the material composition of following parts by weight: 40 ~ 45 parts of furans trees Rouge, 8 ~ 12 parts of polyvinyl alcohol, 5 ~ 8 parts of tartaric acid, 3 ~ 5 parts of neopelexes.
Further, it is 1 ~ 5Pa that the indoor pressure of vacuum is controlled after vacuumize process described in step (3)；It is described to stir The revolving speed of control stirring is 400 ~ 500 turns/min when mixing；It is 3 ~ 4MPa that the indoor pressure of vacuum is controlled after the pressurized treatment.
Further, the temperature of normal temperature condition described in step (4) is 22 ~ 25 DEG C, and relative humidity is 70 ~ 75%.
Further, the temperature in the time control preparing high-temp kiln of firing processing described in step (5) is 1800 ~ 2000 DEG C.
The Cr of common advanced magnesite-chrome brick before2O3For content between 16 ~ 24%, content is larger, is unfavorable for environmentally friendly processing Deng the Cr of existing more good refractory material2O3Content is between 3.5 ~ 9.0%, Cr2O3Content largely reduce, And in order to reach preferably environmentally friendly requirement, Cr2O3Content it is more fewer better, to this present invention one research direction be exactly to drop Low Cr2O3Content.And raw material composition is changed, crystal phase tissue also changes, the hair such as intensity, temperature tolerance of original material Deterioration has been given birth to, therefore on the other hand also to have further increased the physical and chemical quality of material entirety.Based on this present invention to refractory material Preparation method improved, improve its synthesis well using quality, improve the market competitiveness.Wherein, in raw material Chromium slag, the addition usage amount of chrome green and ratio are reduced on ingredient, reduce Cr in material2O3Content, furthermore also added oxygen Change manganese, calcium oxide, rare earth oxide and the secret ingredient of oxidation, wherein the toughness of reinforcing material entirety and resistance to is capable of in the addition of manganese oxide Warm nature, whole heat-resistant knocking stability can be enhanced by aoxidizing secret addition, and the addition of rare earth oxide being capable of feed change surface Activity, promote raw tissue between sintering, improve forming stability；Then in working process, first to dense alumina sand, Chromium slag, magnesia have carried out calcination processing, can activate the lattice of above-mentioned raw materials, the activity and ability of reaction are enhanced, after being convenient for What phase high temperature was fired combines closely, and has then carried out preprocessing processing, has vacuumized to Multiple components, has eliminated interior tissue The air contained, and it is added to oily matter ingredient, it is covered by the immersion of oil film, the generation for reducing later period stomata is conducive to material Expect whole hydration-resisting, the ability of slag corrosion resistance, has carried out embryo processed later and fired, this process middle rare earth and dense alumina sand Etc. forming the higher cenotype of fusing point, whole mechanical strength, stability and service life are improved, making up and enhancing reduces Cr2O3Contain The problem of amount causes material quality to weaken.
The present invention has the advantage that compared with prior art
The present invention has carried out reasonable Optimal improvements to the preparation for processing of refractory material, and integrated artistic is reasonable, step letter Single, easy to promote and utilize, refractory material obtained has good flexibility, thermal shock resistance, slag-resistant aggressivity, anti-height Warm melt erosion, melt permeability resistant to high temperatures and lower linear expansivity etc., and its Cr2O3Content further decreases, and is conducive to The protection of environment, on Trend of Chrome-free direction again huge step, the great market competitiveness and produce and use benefit.
Specific embodiment
Embodiment 1
A kind of preparation method of the high stability refractory material for precious metal smelting, includes the following steps:
(1) raw material weighs spare:
It is spare that following raw materials according is weighed by corresponding parts by weight: 45 parts of dense alumina sand, 5 parts of chromium slags, 12 parts of magnesia, 2 parts of chrome green, 1 part Zirconium oxide, 0.2 part of manganese oxide, 3 parts of calcium oxide, 0.3 part of rare earth oxide, 0.5 part of oxidation be secret, 4 parts of binders；
(2) low temperature calcination is handled:
First dense alumina sand, chromium slag, magnesia are put into progress low temperature calcination processing in calcining furnace jointly, during which controls calcining furnace Interior heating rate be 30 DEG C/min, after rising to 780 DEG C in calcining furnace, taken out after isothermal holding 35min mixture A is standby With；
(3) preprocessing is handled:
The resulting mixture A of step (2) and the weighed chrome green of step (1), zirconium oxide, manganese oxide, calcium oxide are mixed jointly, so After be put into vacuum chamber, then into vacuum chamber add above-mentioned substance gross mass 6% epoxidized soybean oil, then to vacuum chamber into Row vacuumize process, is during which constantly stirred, and to pressurized treatment is carried out in vacuum chamber after 25min, takes out after pressure maintaining processing 1h It is spare to obtain mixture B；
(4) base is handled:
By the resulting mixture B of step (3) and the weighed rare earth oxide of step (1), oxidation is secret, binder be added to jointly it is mixed Mixing treatment is carried out in material machine, takes out to obtain mixture C after 1h, and mixture C is then put into maintenance under normal temperature condition and is handled 16h finally puts it into again and suppresses base in mold, and it is spare to obtain adobe；
(5) prepared by finished product:
Adobe made from step (4) is put into high temperature kiln and is fired processing, takes out and gets product after firing 2h.
Further, the granular size of dense alumina sand as described in step (1) is 0.05 ~ 0.2mm；The chromium slag Granular size is 0.05 ~ 0.15mm；The granular size of the magnesia is 0.01 ~ 0.05mm；The granular size of the chrome green For 0.015 ~ 0.025mm；The granular size of the zirconium oxide is 0.015 ~ 0.035mm；The granular size of the manganese oxide For 0.005 ~ 0.025mm；The granular size of the calcium oxide is 0.02 ~ 0.2mm.
Further, rare earth oxide as described in step (1) is lanthana.
Further, binder as described in step (1) is by the material composition of following parts by weight: 40 parts of furane resins, 8 Part polyvinyl alcohol, 5 parts of tartaric acid, 3 parts of neopelexes.
Further, it is 1 ~ 5Pa that the indoor pressure of vacuum is controlled after vacuumize process described in step (3)；It is described to stir The revolving speed of control stirring is 400 turns/min when mixing；It is 3MPa that the indoor pressure of vacuum is controlled after the pressurized treatment.
Further, the temperature of normal temperature condition described in step (4) is 22 DEG C, and relative humidity is 70 ~ 75%.
Further, the temperature in the time control preparing high-temp kiln of firing processing described in step (5) is 1800 DEG C.
Embodiment 2
A kind of preparation method of the high stability refractory material for precious metal smelting, includes the following steps:
(1) raw material weighs spare:
It is spare that following raw materials according is weighed by corresponding parts by weight: 48 parts of dense alumina sand, 7 parts of chromium slags, 14 parts of magnesia, 2.5 parts of chrome green, 2 Part zirconium oxide, 0.5 part of manganese oxide, 5 parts of calcium oxide, 0.4 part of rare earth oxide, 0.8 part of oxidation be secret, 6 parts of binders；
(2) low temperature calcination is handled:
First dense alumina sand, chromium slag, magnesia are put into progress low temperature calcination processing in calcining furnace jointly, during which controls calcining furnace Interior heating rate be 35 DEG C/min, after rising to 800 DEG C in calcining furnace, taken out after isothermal holding 38min mixture A is standby With；
(3) preprocessing is handled:
The resulting mixture A of step (2) and the weighed chrome green of step (1), zirconium oxide, manganese oxide, calcium oxide are mixed jointly, so After be put into vacuum chamber, then into vacuum chamber add above-mentioned substance gross mass 7% epoxidized soybean oil, then to vacuum chamber into Row vacuumize process, is during which constantly stirred, and to pressurized treatment is carried out in vacuum chamber after 28min, takes after pressure maintaining processing 1.3h Go out mixture B is spare；
(4) base is handled:
By the resulting mixture B of step (3) and the weighed rare earth oxide of step (1), oxidation is secret, binder be added to jointly it is mixed Mixing treatment is carried out in material machine, takes out to obtain mixture C after 1.5h, and mixture C is then put into maintenance under normal temperature condition and is handled 18h finally puts it into again and suppresses base in mold, and it is spare to obtain adobe；
(5) prepared by finished product:
Adobe made from step (4) is put into high temperature kiln and is fired processing, takes out and gets product after firing 2.5h.
Further, the granular size of dense alumina sand as described in step (1) is 0.05 ~ 0.2mm；The chromium slag Granular size is 0.05 ~ 0.15mm；The granular size of the magnesia is 0.01 ~ 0.05mm；The granular size of the chrome green For 0.015 ~ 0.025mm；The granular size of the zirconium oxide is 0.015 ~ 0.035mm；The granular size of the manganese oxide For 0.005 ~ 0.025mm；The granular size of the calcium oxide is 0.02 ~ 0.2mm.
Further, rare earth oxide as described in step (1) is cerium oxide.
Further, binder as described in step (1) is by the material composition of following parts by weight: 43 parts of furane resins, 10 parts of polyvinyl alcohol, 7 parts of tartaric acid, 4 parts of neopelexes.
Further, it is 1 ~ 5Pa that the indoor pressure of vacuum is controlled after vacuumize process described in step (3)；It is described to stir The revolving speed of control stirring is 450 turns/min when mixing；It is 3.5MPa that the indoor pressure of vacuum is controlled after the pressurized treatment.
Further, the temperature of normal temperature condition described in step (4) is 24 DEG C, and relative humidity is 70 ~ 75%.
Further, the temperature in the time control preparing high-temp kiln of firing processing described in step (5) is 1900 DEG C.
Embodiment 3
A kind of preparation method of the high stability refractory material for precious metal smelting, includes the following steps:
(1) raw material weighs spare:
It is spare that following raw materials according is weighed by corresponding parts by weight: 50 parts of dense alumina sand, 8 parts of chromium slags, 15 parts of magnesia, 3 parts of chrome green, 3 parts Zirconium oxide, 0.8 part of manganese oxide, 6 parts of calcium oxide, 0.5 part of rare earth oxide, 1 part of oxidation be secret, 8 parts of binders；
(2) low temperature calcination is handled:
First dense alumina sand, chromium slag, magnesia are put into progress low temperature calcination processing in calcining furnace jointly, during which controls calcining furnace Interior heating rate be 40 DEG C/min, after rising to 830 DEG C in calcining furnace, taken out after isothermal holding 40min mixture A is standby With；
(3) preprocessing is handled:
The resulting mixture A of step (2) and the weighed chrome green of step (1), zirconium oxide, manganese oxide, calcium oxide are mixed jointly, so After be put into vacuum chamber, then into vacuum chamber add above-mentioned substance gross mass 8% epoxidized soybean oil, then to vacuum chamber into Row vacuumize process, is during which constantly stirred, and to pressurized treatment is carried out in vacuum chamber after 30min, takes after pressure maintaining processing 1.5h Go out mixture B is spare；
(4) base is handled:
By the resulting mixture B of step (3) and the weighed rare earth oxide of step (1), oxidation is secret, binder be added to jointly it is mixed Mixing treatment is carried out in material machine, takes out to obtain mixture C after 2h, and mixture C is then put into maintenance under normal temperature condition and is handled 20h finally puts it into again and suppresses base in mold, and it is spare to obtain adobe；
(5) prepared by finished product:
Adobe made from step (4) is put into high temperature kiln and is fired processing, takes out and gets product after firing 3h.
Further, the granular size of dense alumina sand as described in step (1) is 0.05 ~ 0.2mm；The chromium slag Granular size is 0.05 ~ 0.15mm；The granular size of the magnesia is 0.01 ~ 0.05mm；The granular size of the chrome green For 0.015 ~ 0.025mm；The granular size of the zirconium oxide is 0.015 ~ 0.035mm；The granular size of the manganese oxide For 0.005 ~ 0.025mm；The granular size of the calcium oxide is 0.02 ~ 0.2mm.
Further, rare earth oxide as described in step (1) is yttrium oxide.
Further, binder as described in step (1) is by the material composition of following parts by weight: 45 parts of furane resins, 12 parts of polyvinyl alcohol, 8 parts of tartaric acid, 5 parts of neopelexes.
Further, it is 1 ~ 5Pa that the indoor pressure of vacuum is controlled after vacuumize process described in step (3)；It is described to stir The revolving speed of control stirring is 500 turns/min when mixing；It is 4MPa that the indoor pressure of vacuum is controlled after the pressurized treatment.
Further, the temperature of normal temperature condition described in step (4) is 25 DEG C, and relative humidity is 70 ~ 75%.
Further, the temperature in the time control preparing high-temp kiln of firing processing described in step (5) is 2000 DEG C.
Comparative example 1
Compared with Example 2, in step (1), raw material weighs in spare this comparative example 1, eliminates rare earth oxide ingredient, Method and step in addition to this is all the same.
Comparative example 2
Compared with Example 2, in step (1), raw material weighs in spare this comparative example 2, eliminates the secret ingredient of oxidation, removes this Outer method and step is all the same.
Comparative example 3
Compared with Example 2, in step (3) preprocessing processing, the addition for eliminating epoxidized soybean oil makes this comparative example 3 With method and step in addition to this is all the same.
Control group
Application No. is: a kind of pyrogenic process precious metal smelting flexibility composite spinelle tin fire resisting disclosed in CN201410583333.1 Material.
In order to compare effect of the present invention, to above-described embodiment 2, comparative example 1, comparative example 2, comparative example 3, The corresponding material obtained of control group is tested for the property, and specific correlation data is as shown in table 1 below:
Table 1
Note: the corresponding experiment of slag penetration depth described in upper table 1 is: using Static crucible method, in the above-mentioned of 40 × 40mm of Φ Each group material corresponds to 80 grams of precious metal smelting slags of placement in crucible, and 1560 DEG C × 5h is sintered in electric furnace, so circulation 5 times Afterwards, crucible is splitted along crucible hole center, measures each slag corrosion depth；The cold crushing strength, high temperature break resistant intensity, heat Shake stability is measured referring to professional standard.
The synthesis service performance of the refractory material made from the method for the present invention it can be seen from upper table 1 has obtained significant increasing By force, quality is obviously improved, interior Cr2O3Content is 2% hereinafter, good environmental protection, the great market competitiveness and application value.

Claims (7)

1. a kind of preparation method of the high stability refractory material for precious metal smelting, which is characterized in that including walking as follows It is rapid:
(1) raw material weighs spare:
It is spare that following raw materials according is weighed by corresponding parts by weight: 45 ~ 50 parts of dense alumina sand, 5 ~ 8 parts of chromium slags, 12 ~ 15 parts of magnesia, 2 ~ 3 Part chrome green, 1 ~ 3 part of zirconium oxide, 0.2 ~ 0.8 part of manganese oxide, 3 ~ 6 parts of calcium oxide, 0.3 ~ 0.5 part of rare earth oxide, 0.5 ~ 1 part of oxygen Change secret, 4 ~ 8 parts of binders；
(2) low temperature calcination is handled:
First dense alumina sand, chromium slag, magnesia are put into progress low temperature calcination processing in calcining furnace jointly, during which controls calcining furnace Interior heating rate is that 30 ~ 40 DEG C/min takes out after 35 ~ 40min of isothermal holding after rising to 780 ~ 830 DEG C in calcining furnace Mixture A is spare；
(3) preprocessing is handled:
The resulting mixture A of step (2) and the weighed chrome green of step (1), zirconium oxide, manganese oxide, calcium oxide are mixed jointly, so After be put into vacuum chamber, then into vacuum chamber add above-mentioned substance gross mass 6 ~ 8% epoxidized soybean oil, then to vacuum chamber Vacuumize process is carried out, is during which constantly stirred, to carrying out pressurized treatment in vacuum chamber after 25 ~ 30min, pressure maintaining processing 1 ~ Taken out after 1.5h mixture B is spare；
(4) base is handled:
By the resulting mixture B of step (3) and the weighed rare earth oxide of step (1), oxidation is secret, binder be added to jointly it is mixed Mixing treatment is carried out in material machine, takes out to obtain mixture C after 1 ~ 2h, and mixture C is then put into maintenance under normal temperature condition and is handled 16 ~ 20h finally puts it into again and suppresses base in mold, and it is spare to obtain adobe；
(5) prepared by finished product:
Adobe made from step (4) is put into high temperature kiln and is fired processing, takes out and gets product after 2 ~ 3h of firing.
2. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, the granular size of dense alumina sand as described in step (1) is 0.05 ~ 0.2mm；The granular size of the chromium slag For 0.05 ~ 0.15mm；The granular size of the magnesia is 0.01 ~ 0.05mm；The granular size of the chrome green be 0.015 ~ 0.025mm；The granular size of the zirconium oxide is 0.015 ~ 0.035mm；The granular size of the manganese oxide be 0.005 ~ 0.025mm；The granular size of the calcium oxide is 0.02 ~ 0.2mm.
3. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, rare earth oxide as described in step (1) is lanthana, cerium oxide, any one in yttrium oxide.
4. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, binder as described in step (1) is by the material composition of following parts by weight: 40 ~ 45 parts of furane resins, 8 ~ 12 parts Polyvinyl alcohol, 5 ~ 8 parts of tartaric acid, 3 ~ 5 parts of neopelexes.
5. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, it is 1 ~ 5Pa that the indoor pressure of vacuum is controlled after vacuumize process described in step (3)；It is controlled when the stirring The revolving speed of stirring is 400 ~ 500 turns/min；It is 3 ~ 4MPa that the indoor pressure of vacuum is controlled after the pressurized treatment.
6. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, the temperature of normal temperature condition described in step (4) is 22 ~ 25 DEG C, and relative humidity is 70 ~ 75%.
7. a kind of preparation method of high stability refractory material for precious metal smelting according to claim 1, It is characterized in that, the temperature in the time control preparing high-temp kiln of firing processing described in step (5) is 1800 ~ 2000 DEG C.
CN201910039041.4A 2019-01-16 2019-01-16 A kind of preparation method of the high stability refractory material for precious metal smelting Pending CN109665823A (en)

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CN102731126A (en) * 2012-07-25 2012-10-17 营口青花耐火材料股份有限公司 Composite spinel-zirconium refractory material for smelting colored heavy metal
CN102863221A (en) * 2012-09-20 2013-01-09 广东风华高新科技股份有限公司 Method, sintering aid and materials for preparation of low-temperature cofired medium ceramic and application

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