CN104150927B - A kind of low ferrum, the production method of low silicon fire resistive material level chrome oxide green - Google Patents
A kind of low ferrum, the production method of low silicon fire resistive material level chrome oxide green Download PDFInfo
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- CN104150927B CN104150927B CN201410385177.8A CN201410385177A CN104150927B CN 104150927 B CN104150927 B CN 104150927B CN 201410385177 A CN201410385177 A CN 201410385177A CN 104150927 B CN104150927 B CN 104150927B
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Abstract
The invention discloses a kind of low ferrum, the production method of low silicon fire resistive material level chrome oxide green, step is as follows: (1) selects top grade product chromic anhydride, and wherein silicon, the content of ferrum are respectively less than 0.02%；(2) joining in rotary furnace by chromic anhydride, the kiln hood seal closure of rotary furnace uses rustless steel seal closure, and kiln hood refractory brick material uses zirconia refractory, and kiln tail uses common refractory；(3) heating rotary furnace, controlling temperature of kiln head is 1,000 1200 DEG C, and kiln end temperature is 400 600 DEG C, and making material is 2 4h at revolution residing time in furnace；(4) after roasting completes, after naturally cooling to room temperature, carry out batch mixing, sieve, grind and pack, obtain the low ferrum of the present invention, low silicon fire resistive material level chrome oxide green.The present invention is controlled by transformation and process optimization, makes silicon in product, iron content reach refractory material level chrome oxide green product requirement, produces the product met the requirements of the customers, opened up product market, improved added value of product.
Description
Technical field
The present invention relates to chromic salts technical field, particularly relate to a kind of low ferrum, low silicon fire resistive material level
The production method of chrome oxide green.
Background technology
Chrome oxide green is light green brilliant to tiny six reef knots of bottle green.Scorching hot time-varying brown, cold after still
Become green.Crystalline solid is extremely hard, stabilizer pole, even if it is the most unchanged to be passed through hydrogen under red heat,
Fusing point about 2435 DEG C, boiling point 4000 DEG C.Mohs' hardness 8.5, is only second to diamond and diamond spar.
It is mainly used as pigment, produces the refractory material such as high-chrome brick, chromium steel jade brick, metal smelting chromium and carbon
Change the purposes such as chromium.Also act as enamel, pottery, artificial leather, the coloring agent of construction material, organic
The catalyst of chemosynthesis, sun-proof coating, grinding-material, green polishing composition and printing of currency papers
Ink special.
Because chrome oxide green stabilizer pole and fusing point, hardness are higher, thus chrome oxide green mainly for the production of
Senior or superrefractory.When being used for producing refractory material, to chrome oxide green product
Silicon, iron content extremely tight, typically require that the silicone content in product is not more than 0.15%, iron content
Being not more than 0.15%, active constituent content is more than 99.3%.The thermal decomposition of traditional chromium anhydride produces oxygen
Change chrome green technique because of in roasting process temperature higher, kiln hood material and refractory brick material are commonly
Carbon steel material and common refractory brick, therefore in process of production because of the factor such as high temperature, oxidation, product
In be easily mixed into the impurity such as silicon, ferrum, affect product serviceability.
Patent " method of producing dichromium trioxide using chromic acid thermal decomposition continuous method ", the patent No.:
In ZL02119561.7, describe a kind of producing dichromium trioxide using chromic acid thermal decomposition continuous method
Method.The method, with chromic acid as raw material, adds returning charge, additive, uniformly after mixing, quantitatively
Put into insulation rotary kiln fuel injector tip, do fuel with liquefied gas, directly contact with material and flow
Burning, through vigorous reaction production chrome oxide green more cooled, pulverizing obtains chrome oxide green product.
Patent " a kind of full-boiled process produces the method for chromic oxide ", the patent No.:
201310206105.8, the method describes a kind of chromic anhydride thermal decomposition equally and produces chrome oxide green
Method, but the method is mainly produced by adding a kind of low Cr VI chrome oxide green of Additive Production
Product, product is mainly used as polishing and grinding-material.
Summary of the invention
Present invention aim at providing a kind of low ferrum, the production of low silicon fire resistive material level chrome oxide green
Method.
The present invention adopts the technical scheme that:
The low ferrum of the present invention, the concrete steps of production method of low silicon fire resistive material level chrome oxide green
As follows:
(1) selecting top grade product chromic anhydride, wherein silicon, the content of ferrum are respectively less than 0.02%, from source
Control silicon, iron content in product；
(2) joining in rotary furnace by chromic anhydride, the kiln hood seal closure of rotary furnace uses rustless steel close
Sealing cover, stops the impurity containing rust and is mixed into product and makes iron content raise, because of kiln hood temperature in production process
Spend higher, therefore kiln hood refractory brick material be replaced by the resistant to elevated temperatures high grade refractory of zirconium oxide,
Kiln portion is relatively low because of temperature, therefore selects common refractory, reaches according to this to control product
The purpose of middle silicone content；
(3) rotary furnace is heated, control temperature of kiln head and be 1000-1200 DEG C, kiln end temperature
For 400-600 DEG C, making material is 2-4h at revolution residing time in furnace；
(4), after roasting completes, after naturally cooling to room temperature, carry out batch mixing, sieve, grind and wrap
Dress, obtains the low ferrum of the present invention, low silicon fire resistive material level chrome oxide green.
In step (3), preferably controlling temperature of kiln head is 1000 DEG C, and kiln end temperature is 500 DEG C,
Making material is 3h at revolution residing time in furnace.
In step (4), batch mixing, sieve, grind, package production, all select stainless
The instrument of steel matter, prevents product iron content from raising.
The positive effect of the present invention is as follows:
The low ferrum of the present invention, the production method of low silicon fire resistive material level chrome oxide green are selected and are more easy to behaviour
The chromic anhydride made and feed intake is raw material, not blast blending, preferably top grade product chromic anhydride, controls
Silicon, iron content in raw material, refractory material level chrome oxide green product because of to content of 6-valence Cr ions without want
Ask, therefore this method is mainly to control silicon, iron content, is transformed by many-side, makes product
Middle silicon, iron content reach refractory material level chrome oxide green product requirement, produce meet client want
The product asked, adds product variety, has opened up product market, has improved added value of product,
At Chrome Salt Industry, there is good demonstration effect.
Detailed description of the invention
The following examples are that the present invention is described in further detail.
Embodiment 1
Rotary kiln is not transformed, by 1000Kg primes chromic anhydride, in 2 hours uniformly
Putting into rotary kiln, kiln hood injection liquefied gas burning, controlling kiln hood flame temperature is 1000 DEG C,
Material is the roasting time of staying about 3 hours in rotary kiln.Amount to production and obtain chrome oxide green 0.75
Ton, in product, silicone content is 0.28%, iron content 0.31%, and Cr2O3 content is 99.18%.
Product, because of ferrosilicon content overproof (less than 0.15%), does not meets refractory material level chrome oxide green and produces
Product requirement.
Embodiment 2
Transformation rotary kiln, is replaced by rustless steel by the ordinary steel seal closure of easy for kiln hood oxidation corrosion
Seal closure, stops the impurity containing rust and is mixed into product and makes iron content raise；By kiln hood refractory brick material
Being replaced by the high temperature resistant high grade refractory of zirconium oxide, kiln tail is not transformed；3, raw to product
The batch mixing that relates to during product, sieve, grind, the production process such as packaging, all select rustless steel
Material.By 1000Kg top grade product chromic anhydride after transformation, in 2 hours, uniformly put into rotary kiln,
Kiln hood injection liquefied gas burning, controlling kiln hood flame temperature is 1000 DEG C, and material is at rotary kiln
About 3 hours interior roasting time of staying.Amount to production and be similarly obtained chrome oxide green 0.75 ton, produce
In product, silicone content is 0.14%, iron content 0.14%, and Cr2O3 content is 99.52%.Reach resistance to
Fire material level chrome oxide green product standard, produces the refractory material level oxidation met the requirements of the customers
Chrome green product.
Although an embodiment of the present invention has been shown and described, for the ordinary skill of this area
For personnel, it is possible to understand that without departing from the principles and spirit of the present invention can be to this
A little embodiments carry out multiple change, revise, replace and modification, and the scope of the present invention is by appended power
Profit requires and equivalent limits.
Claims (2)
1. low ferrum, a production method for low silicon fire resistive material level chrome oxide green, its feature exists
In: specifically comprising the following steps that of described production method
(1) selecting top grade product chromic anhydride, wherein silicon, the content of ferrum are respectively less than 0.02%；
(2) joining in rotary furnace by chromic anhydride, the kiln hood seal closure of rotary furnace uses stainless
Steel seal closure, kiln hood refractory brick material uses zirconia refractory, and kiln tail uses the most fire-resistant
Material；
(3) heating rotary furnace, controlling temperature of kiln head is 1000 DEG C, and kiln end temperature is
500 DEG C, making material is 3h at revolution residing time in furnace；
(4), after roasting completes, after naturally cooling to room temperature, carry out batch mixing, sieve, grind
And packaging, obtain low ferrum, low silicon fire resistive material level chrome oxide green.
Low ferrum the most as claimed in claim 1, the production of low silicon fire resistive material level chrome oxide green
Method, it is characterised in that: in step (4), batch mixing, sieve, grind, pack and produced
Journey, all selects the instrument of stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410385177.8A CN104150927B (en) | 2014-08-06 | 2014-08-06 | A kind of low ferrum, the production method of low silicon fire resistive material level chrome oxide green |
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| CN201410385177.8A CN104150927B (en) | 2014-08-06 | 2014-08-06 | A kind of low ferrum, the production method of low silicon fire resistive material level chrome oxide green |
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| CN104150927A CN104150927A (en) | 2014-11-19 |
| CN104150927B true CN104150927B (en) | 2016-09-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408130A (en) * | 2011-09-09 | 2012-04-11 | 甘肃锦世化工有限责任公司 | Preparation method of hydrated chromium oxide green |
| CN102557136A (en) * | 2012-03-15 | 2012-07-11 | 甘肃锦世化工有限责任公司 | Method for improving color of chromium oxide green |
| CN102627326A (en) * | 2012-04-27 | 2012-08-08 | 甘肃锦世化工有限责任公司 | Method for producing hydrated chromium oxide green |
| CN103253709A (en) * | 2013-05-29 | 2013-08-21 | 甘肃锦世化工有限责任公司 | Method for producing chromium sesquioxide through hot method |
-
2014
- 2014-08-06 CN CN201410385177.8A patent/CN104150927B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102408130A (en) * | 2011-09-09 | 2012-04-11 | 甘肃锦世化工有限责任公司 | Preparation method of hydrated chromium oxide green |
| CN102557136A (en) * | 2012-03-15 | 2012-07-11 | 甘肃锦世化工有限责任公司 | Method for improving color of chromium oxide green |
| CN102627326A (en) * | 2012-04-27 | 2012-08-08 | 甘肃锦世化工有限责任公司 | Method for producing hydrated chromium oxide green |
| CN103253709A (en) * | 2013-05-29 | 2013-08-21 | 甘肃锦世化工有限责任公司 | Method for producing chromium sesquioxide through hot method |
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