CN104150927A - Production method for low-iron low-silicon fire-resistant material grade chromium oxide green - Google Patents
Production method for low-iron low-silicon fire-resistant material grade chromium oxide green Download PDFInfo
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Abstract
The invention discloses a production method for low-iron low-silicon fire-resistant material grade chromium oxide green. The production method comprises the following steps: (1), selecting premium-grade chromic anhydride, wherein the silicon content and the iron content are less than 0.02%; (2), adding the chromic anhydride in a rotary kiln, wherein the kiln head sealing cover of the rotary kiln adopts a stainless steel sealing cover, the kiln head refractory bricks are made of zirconia refractory, and the kiln tail is made of normal refractory material; (3), heating the rotary kiln, controlling the temperature of the kiln head to 1000-1200 DEG C, controlling the temperature of the kiln tail to 400-600 DEG C, and enabling the material to stay for 2-4 h in the rotary kiln; (4), after roasting, performing natural cooling to the room temperature, mixing material, screening, grinding and packaging, so as to obtain the low-iron low-silicon fire-resistant material grade chromium oxide green. According to the invention, through improvement and process optimizing control, the content of the silicon and iron meets the requirements of the fire-resistant material grade chromium oxide green, the product meeting the requirements of customers are produced, the product market is expanded, and the additional value of the low-iron low-silicon fire-resistant material grade chromium oxide green is increased.
Description
Technical field
The present invention relates to chromic salts technical field, relate in particular to the production method of a kind of low iron, low silicon fire resistive material level chromoxide green.
Background technology
Chromoxide green is light green brilliant to tiny six reef knots of deep green.The temperature time variance that burns is brown, still becomes green after cold.Xln is extremely hard, stabilizer pole, even if it is also unchanged to pass into hydrogen under red heat, and approximately 2435 ℃ of fusing points, 4000 ℃ of boiling points.Mohs' hardness 8.5, is only second to diamond and diamond spar.Main as pigment, produce the refractory materialss such as high-chrome brick, the beautiful brick of chromium steel, the purposes such as metal smelting chromium and chromium carbide.Also be used as enamel, pottery, leatheroid, the tinting material of material of construction, the ink special of the catalyzer of organic chemical synthesis, sun-proof coating, abrasive substance, green polishing composition and printing of currency papers.
Because chromoxide green stabilizer pole and fusing point, hardness are higher, therefore chromoxide green is mainly for the production of senior or superrefractory.When being used to produce refractory materials, extremely tight to the silicon of chromoxide green product, iron level, the silicone content in general requirement product is not more than 0.15%, and iron level is not more than 0.15%, and active constituent content is greater than 99.3%.Traditional chromium acid anhydrides thermolysis production chromoxide green technique because of temperature in roasting process higher, kiln hood material and refractory brick material are plain carbon stool material and common refractory brick, therefore the factor such as Yin Gaowen, oxidation in process of production, in product, very easily sneak into the impurity such as silicon, iron, affect product use properties.
The method > > of patent < < producing dichromium trioxide using chromic acid thermal decomposition continuous method, the patent No.: in ZL02119561.7, introduced a kind of method of producing dichromium trioxide using chromic acid thermal decomposition continuous method.The method be take chromic acid as raw material, adds returning charge, additive, after evenly mixing, quantitatively drop into insulation rotary kiln fuel injection end, with liquefied gas, do fuel, directly contact with material and flow burning, through vigorous reaction production chromoxide green, then obtain chromoxide green product through cooling, pulverizing.
Patent < < hot method is produced the method > > of chromium sesquioxide, the patent No.: 201310206105.8, the method has been introduced a kind of method of chromic trioxide thermolysis production chromoxide green equally, but the method is mainly by adding a kind of low sexavalent chrome chromoxide green product of Additive Production, and product is mainly as polishing and abrasive substance.
Summary of the invention
The object of the invention is to provide the production method of a kind of low iron, low silicon fire resistive material level chromoxide green.
The technical scheme that the present invention takes is:
The concrete steps of the production method of low iron of the present invention, low silicon fire resistive material level chromoxide green are as follows:
(1) select top grade product chromic trioxide, wherein the content of silicon, iron is all less than 0.02%, controls silicon, iron level product from source;
(2) chromic trioxide is joined in rotary kiln, the kiln hood seal closure of rotary kiln is used stainless steel seal closure, stopping to sneak into product containing iron rust impurity raises iron level, in production process because temperature of kiln head is higher, therefore kiln hood refractory brick material is replaced by the resistant to elevated temperatures high grade refractory of zirconium white, Yin Wendu is lower for kiln portion, therefore select common refractory, reaches according to this object of controlling silicone content in product;
(3) rotary kiln is heated, control temperature of kiln head is 1000-1200 ℃, and kiln end temperature is 400-600 ℃, and making material is 2-4h at revolution residing time in furnace;
(4) after roasting completes, naturally cool to after room temperature, carry out batch mixing, screening, grinding and packing, obtain low iron of the present invention, low silicon fire resistive material level chromoxide green.
In step (3), preferably controlling temperature of kiln head is 1000 ℃, and kiln end temperature is 500 ℃, and making material is 3h at revolution residing time in furnace.
In step (4), batch mixing, screening, grinding, package production, all select the instrument of stainless steel, prevents that product iron content from raising.
Positively effect of the present invention is as follows:
Low iron of the present invention, it is raw material that the production method of low silicon fire resistive material level chromoxide green is selected more easy to operate and chromic trioxide that feed intake, blast blending not, preferred top grade product chromic trioxide, control silicon in starting material, iron level, refractory materials level chromoxide green product is because of to content of 6-valence Cr ions no requirement (NR), therefore present method is mainly to control silicon, iron level is main, by many-side, transform, make silicon in product, iron level reaches refractory materials level chromoxide green product requirement, produce the product meeting the requirements of the customers, increased range of product, opened up produce market, promoted added value of product, at Chrome Salt Industry, there is good demonstration effect.
Embodiment
The following examples are to describe in further detail of the present invention.
Embodiment 1
Rotary kiln is not transformed, and by 1000Kg first grade chromic trioxide, evenly drops into rotary kiln in 2 hours, kiln hood steam ejection liquefaction gas firing, and controlling kiln hood flame temperature is 1000 ℃, material is approximately 3 hours roasting residence time in rotary kiln.Amount to production and obtain 0.75 ton of chromoxide green, in product, silicone content is 0.28%, iron level 0.31%, and Cr2O3 content is 99.18%.Product, because of ferrosilicon content overproof (being less than 0.15%), does not meet refractory materials level chromoxide green product requirement.
Embodiment 2
Transformation rotary kiln, is replaced by stainless steel seal closure by the ordinary steel seal closure of the easy oxidation corrosion of kiln hood, stops to sneak into product containing iron rust impurity iron level is raise; Kiln hood refractory brick material is replaced by the high temperature resistant high grade refractory of zirconium white, and kiln tail is not transformed; 3, to production processes such as the batch mixing relating in process of producing product, screening, grinding, packings, all select stainless steel.After transformation, by 1000Kg top grade product chromic trioxide, in 2 hours, evenly drop into rotary kiln, kiln hood steam ejection liquefaction gas firing, controlling kiln hood flame temperature is 1000 ℃, material is approximately 3 hours roasting residence time in rotary kiln.Amount to production and obtain equally 0.75 ton of chromoxide green, in product, silicone content is 0.14%, iron level 0.14%, and Cr2O3 content is 99.52%.Reach refractory materials level chromoxide green product standard, produce the refractory materials level chromoxide green product meeting the requirements of the customers.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claims and equivalent thereof.
Claims (3)
1. a production method for low iron, low silicon fire resistive material level chromoxide green, is characterized in that: the concrete steps of described production method are as follows:
(1) select top grade product chromic trioxide, wherein the content of silicon, iron is all less than 0.02%;
(2) chromic trioxide is joined in rotary kiln, the kiln hood seal closure of rotary kiln is used stainless steel seal closure, kiln hood refractory brick materials'use zirconia refractory, and kiln tail is used common refractory;
(3) rotary kiln is heated, control temperature of kiln head is 1000-1200 ℃, and kiln end temperature is 400-600 ℃, and making material is 2-4h at revolution residing time in furnace;
(4) after roasting completes, naturally cool to after room temperature, carry out batch mixing, screening, grinding and packing, obtain low iron of the present invention, low silicon fire resistive material level chromoxide green.
2. the production method of low iron as claimed in claim 1, low silicon fire resistive material level chromoxide green, is characterized in that: in step (3), controlling temperature of kiln head is 1000 ℃, and kiln end temperature is 500 ℃, and making material is 3h at revolution residing time in furnace.
3. the production method of low iron as claimed in claim 1, low silicon fire resistive material level chromoxide green, is characterized in that: in step (4), batch mixing, screening, grinding, package production, all select 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 true CN104150927A (en) | 2014-11-19 |
| CN104150927B CN104150927B (en) | 2016-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020005781A1 (en) * | 2018-06-27 | 2020-01-02 | Uop Llc | Processes and apparatuses for toluene and benzene methylation in an aromatics complex |
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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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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020005781A1 (en) * | 2018-06-27 | 2020-01-02 | Uop Llc | Processes and apparatuses for toluene and benzene methylation in an aromatics complex |
| US20200002245A1 (en) * | 2018-06-27 | 2020-01-02 | Uop Llc | Processes and apparatuses for toluene and benzene methylation in an aromatics complex |
| CN112272660A (en) * | 2018-06-27 | 2021-01-26 | 环球油品有限责任公司 | Method and apparatus for methylating toluene and benzene in an aromatics complex |
| US11192833B2 (en) | 2018-06-27 | 2021-12-07 | Uop Llc | Processes and apparatuses for toluene and benzene methylation in an aromatics complex |
| CN112272660B (en) * | 2018-06-27 | 2023-07-28 | 环球油品有限责任公司 | Method and apparatus for methylating toluene and benzene in an aromatics complex |
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| CN104150927B (en) | 2016-09-28 |
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