CN1186265C - Method of producing dichromium trioxide using chromic acid thermal decomposition continuous method - Google Patents
Method of producing dichromium trioxide using chromic acid thermal decomposition continuous method Download PDFInfo
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- CN1186265C CN1186265C CNB021195617A CN02119561A CN1186265C CN 1186265 C CN1186265 C CN 1186265C CN B021195617 A CNB021195617 A CN B021195617A CN 02119561 A CN02119561 A CN 02119561A CN 1186265 C CN1186265 C CN 1186265C
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- chromic acid
- chromium sesquioxide
- rotary kiln
- materials
- thermal decomposition
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- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 title claims abstract description 122
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 title claims abstract description 44
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000011437 continuous method Methods 0.000 title claims abstract description 14
- 238000005979 thermal decomposition reaction Methods 0.000 title claims description 23
- 239000000463 material Substances 0.000 claims abstract description 45
- 239000000446 fuel Substances 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000004327 boric acid Substances 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000010298 pulverizing process Methods 0.000 claims abstract description 15
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 6
- 229920002472 Starch Polymers 0.000 claims abstract description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 4
- 235000019698 starch Nutrition 0.000 claims abstract description 4
- 239000008107 starch Substances 0.000 claims abstract description 4
- 239000002023 wood Substances 0.000 claims abstract description 4
- 235000010338 boric acid Nutrition 0.000 claims abstract description 3
- 125000005619 boric acid group Chemical group 0.000 claims abstract description 3
- 230000035484 reaction time Effects 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 3
- -1 add returning charge Substances 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims description 2
- 230000009970 fire resistant effect Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000011651 chromium Substances 0.000 abstract description 16
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 150000003839 salts Chemical class 0.000 abstract description 8
- 229910052804 chromium Inorganic materials 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 4
- 238000000354 decomposition reaction Methods 0.000 abstract 4
- 238000004321 preservation Methods 0.000 abstract 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000004927 fusion Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000049 pigment Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000002932 luster Substances 0.000 description 3
- 238000001149 thermolysis Methods 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- NNBFNNNWANBMTI-UHFFFAOYSA-M brilliant green Chemical compound OS([O-])(=O)=O.C1=CC(N(CC)CC)=CC=C1C(C=1C=CC=CC=1)=C1C=CC(=[N+](CC)CC)C=C1 NNBFNNNWANBMTI-UHFFFAOYSA-M 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- KXXXUIKPSVVSAW-UHFFFAOYSA-K pyranine Chemical compound [Na+].[Na+].[Na+].C1=C2C(O)=CC(S([O-])(=O)=O)=C(C=C3)C2=C2C3=C(S([O-])(=O)=O)C=C(S([O-])(=O)=O)C2=C1 KXXXUIKPSVVSAW-UHFFFAOYSA-K 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The present invention relates to a method for manufacturing chromium sesquioxide, particularly to a method for manufacturing chromium sesquioxide by a chromic acid heat decomposition continuous method, which solves the problem of the disadvantages of the low main content, the high residual sexivalent chromium and water soluble salt content, the low heat efficiency, etc. of the traditional chromic acid heat decomposition method. The method for manufacturing chromium sesquioxide by a chromic acid heat decomposition continuous method comprises the following reaction steps: chromic acid is used as a raw material, returning materials and an additive agent are added, the chromic acid, the returning materials and the additive agent are mixed, the returning materials are from 3 to 7% of total materials, the additive agent is from 0.2 to 0.6% of the total material materials, the returning materials are thick chromium sesquioxide, and the additive agent is selected from boric acid, ammonium chloride, starch and wood dust and is preferably the boric acid; under the control of a microcomputer, after materials are uniformly mixed, the materials are quantitatively put into a fuel injection end of a heat preservation rotary kiln, liquefied gas is used as roasting fuel, the liquefied gas directly contacts the materials, and the flows of the fuel and the materials are combined for combustion; after an intensive heat decomposition reaction, the chromic acid is converted into the chromium sesquioxide; after the heat preservation of the product of the chromium sesquioxide is carried out for a period of time in the rotary kiln, the qualified product of the chromium sesquioxide can be obtained after a cooling process and a pulverizing process. The cooled chromium sesquioxide which is not pulverized is proportionally added into the raw material, and the cooled chromium sesquioxide which is not pulverized as the returning materials is roasted.
Description
(1) technical field:
The present invention relates to a kind of method of making chromium sesquioxide, a kind of specifically method of utilizing producing dichromium trioxide using chromic acid thermal decomposition continuous method.
(2) background technology:
Chromium sesquioxide claims chromic oxide again, and the chromic oxide that is exclusively used in pigment claims chromoxide green again, is green powder.The chromic oxide main application is divided into four big classes: system chromium metal and senior (non-iron-based) Chrome metal powder; As refractory materials; Pigment (tinting material); Abrasive material (abrasive).Metallurgical grade chromic oxide has strict restriction to impurity C, S, Fe, As, Pb etc.; Refractory materials level chromic oxide has regulation to fusing point, density, impurity F e, Si etc.; Pigment-level chromic oxide requires to have good pigment performance (coloured light, tinting strength, oil number, opacifying power, specific surface area etc.); Abrasive material has regulation with chromic oxide to granularity, polishing force, surfaceness etc.
At present, the roasting apparatus with chromic acid thermolysis manufacturing chromium sesquioxide is generally native stove, reverberatory furnace, flint road kiln both at home and abroad, and equipment thermal efficiency has only 35-50%; The fuel that adopts is coal, wet goods, and ton output fuel consumption is big.The technology that adopts is that the raw material chromic acid does not directly contact with fuel, does not reach required optimum temps of raw material reaction and time, not doping in the raw material.The raw material reaction time is long, is generally 8-12 hour, and is batch production, and the productivity of equipment is low, can not realize serialization production.The raw material that enters roasting apparatus is a hand fed, and personnel labor is big.Flue gas in the raw material reaction process is subjected to the fully collection and treatment of restriction of equipment, the consumption height of ton output.Raw material remains static in reaction process, and it is inhomogeneous to be heated, and causes main content low, remaining sexavalent chrome (Cr
6+) and water-soluble salt height, product be irregular particulate, color and luster is bright, and consistence is poor, needs could reduce sexavalent chrome through the method for aftertreatments such as rinsing, improves the color and luster lightness.
(3) summary of the invention:
The present invention has overcome the deficiency of aforesaid device and technology, and a kind of method of producing dichromium trioxide using chromic acid thermal decomposition continuous method is provided.
The method of producing dichromium trioxide using chromic acid thermal decomposition continuous method of the present invention, it may further comprise the steps:
A, be raw material, add returning charge, additive mixes with the chromic acid, returning charge account for total material 3～7%, additive accounts for 0.2～0.6% of total material; Returning charge is thick chromium sesquioxide, and additive is selected from boric acid, ammonium chloride, starch, wood chip, preferred boric acid;
B, under microcomputer control, with mixing of materials evenly after, quantitatively drop into insulation rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, the high-temperature zone temperature is 1000～1150 ℃, preferred 1100～1150 ℃; Reaction times is 40～60 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide;
C, chromium sesquioxide come out from rotary kiln be incubated for some time in rotary kiln after, promptly become qualified chromium sesquioxide product after cooling, pulverizing; Soaking time is 80～120 minutes;
The chromium sesquioxide of not pulverizing after the cooling in D, the C step adds in the raw material in proportion as the returning charge roasting.
The drop temperature of rotary kiln is 420～450 ℃.
Rotary kiln as roasting apparatus in the B step is a double-decked insulation, and the rotary kiln internal surface adopts that the fire resistant heat preserving composite light is brick builds insulation, and the rotary kiln outside surface is incubated with composite material.
Far infrared remote sensing thermometric is adopted in the temperature control of rotary kiln high-temperature zone, and forms closed cycle control with Liquified gas control valve.
Adopt resistive connection to reveal electric dust-removing equipment in the calcination process and carry out dedusting.
Be adhered to the kiln wall if any a small amount of fusion chromic acid, gently disclose with drill rod, promptly tear-away.
The chemical equation of making chromium sesquioxide with the chromic trioxide thermal decomposition method is:
Several additives of selecting for use in the steps A, as follows with remaining chromic chemical reaction mechanism in the reduction product:
1, add boric acid:
2, add ammonium chloride:
3, add starch:
4, add wood chip:
Rotary kiln as roasting apparatus among the present invention adopts inside and outside double-decked insulation, and the thermo-efficiency of rotary kiln is improved more than 20～25%, and ton product fuel consumption reduces more than 30%; Material is subjected to the drive of rotary kiln to do at the uniform velocity revolution and curve is moved, each surface of material particles is heated evenly, stablizes, and feed stock conversion reaches more than 99.7%, and owing to add additive in the raw material, the chromic acid sexavalent chrome is a trivalent chromium by abundant thermolysis, can make remaining sexavalent chrome (Cr in the finished product
6+) less than 5PPm, raw material directly being dropped into the rotary kiln high temperature section, material enters the high-temperature zone roasting rapidly in rotary kiln, draw off from rotary kiln after being incubated, and needs altogether to stop 2-3 hour, can boost productivity more than 4 times, and the consumption of ton product reduces 5-10%.Utilize the clean inclusion-free of liquefied gas, characteristics that heat generation rate is high, adopting liquefied gas is that fuel directly contacts with material, make material absorb heat to greatest extent, temperature raises rapidly, material surface and inside are heated evenly, vigorous reaction takes place in moment, sufficient reacting, stable, complete, thereby finish continuous heating, continuous charging, roasting continuously, continuous discharge, it is automatic continuous production, produce the technology of chromium sesquioxide with other traditional chromic acid thermolysiss and compare with equipment, main content height reaches more than 99.7%.Because material rises rapidly in rotary kiln high temperature section temperature, and can reach optimal reaction temperature and reaction times, make that product has that color is pure, steady quality, color and luster are beautiful, bright-coloured, no color differnece, shape particulate spherical in shape, advantage such as at the bottom of tinctorial yield height, productivity height, the cost, a ton product cost can reduce more than 500 yuan.In raw material, add thick chromium sesquioxide as returning charge, both can improve the raw material thermal decomposition rate, can solve in the raw material thermal decomposition process knot wall problem of rotary kiln again.
Use the microcomputer control feeding capacity, by speed-governing belt claim, revolving plow reclaimer, realize fast, evenly, metering feeding accurately, reduce staff labor intensity, improve labour health condition.
Far infrared remote sensing thermometric is adopted in the temperature control of rotary kiln high-temperature zone, and forms closed cycle control with Liquified gas control valve, quick and precisely controls liquefied gas tolerance, makes rotary kiln high-temperature zone temperature-stable in 1000～1150 ℃ of scopes.Adopt resistive connection to reveal electric dust-removing equipment in the calcination process and carry out dedusting, the product flow vector is dropped to below 0.2～0.3%.
Subordinate list: the comparison of the present invention and traditional chromic acid thermal decomposition method
| Sequence number | Project | Technology of the present invention | Traditional technology |
| 1 | Fuel | Liquefied gas | Coal, oil, Sweet natural gas |
| 2 | Fuel consumption | 12-13MJ/T ton product | The 15-17MJ/T product |
| 3 | Raw material consumption (chromic acid) | 1.3T/T product | 1.36-1.4T/T product |
| 4 | Main content Cr 2O 3 | ≥99.7％ | ≤98％ |
| 5 | Water-soluble salt | ≤0.2％ | ≥0.4％ |
| 6 | Sexavalent chrome Cr 6+ | ＜5ppm | ＞250ppm |
| 7 | Color | Emerald green | Dark green |
| 8 | Brightness | Bright-coloured | Not bright-coloured |
| 9 | Particulate form | Spherical particle | Irregular particulate |
(4) description of drawings:
Fig. 1 is a process flow sheet of the present invention.
(5) embodiment:
Following example will further specify the present invention.
Example 1
(contain Cr with chromic acid
2O
3〉=99.5) with thick chromium sesquioxide, boric acid, under microcomputer control, mix, its material proportion is a chromic acid: thick chromium sesquioxide: boric acid=100: 3: 0.2 (weight); Quantitatively drop into rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1000 ℃; Reaction times is 40 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide; Chromium sesquioxide is incubated in rotary kiln, and soaking time is 80 minutes; Come out from rotary kiln then, kiln end temperature is 420 ℃.After cooling, pulverizing, promptly become qualified chromium sesquioxide product; The chromium sesquioxide of not pulverizing after the cooling adds in the raw material in proportion as the returning charge roasting.Product master content 99.77%, aqueous fusion salt 0.12%, sexavalent chrome Cr
6+4ppm.
Example 2
(contain Cr with chromic acid
2O
3〉=99.5) with thick chromium sesquioxide, boric acid, under microcomputer control, mix, its material proportion is a chromic acid: thick chromium sesquioxide: boric acid=100: 4: 0.3 (weight); Quantitatively drop into rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1050 ℃; Reaction times is 45 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide; Chromium sesquioxide is incubated in rotary kiln, and soaking time is 90 minutes; Come out from rotary kiln then, kiln end temperature is 435 ℃.After cooling, pulverizing, promptly become qualified chromium sesquioxide product; The chromium sesquioxide of not pulverizing after the cooling adds in the raw material in proportion as the returning charge roasting.Product master content 99.82%, aqueous fusion salt 0.1%, sexavalent chrome Cr
6+3.1ppm.
Example 3
(contain Cr with chromic acid
2O
3〉=99.5) with thick chromium sesquioxide, boric acid, under microcomputer control, mix, its material proportion is a chromic acid: thick chromium sesquioxide: boric acid=100: 5: 0.4 (weight); Quantitatively drop into rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1100 ℃; Reaction times is 52 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide; Chromium sesquioxide is incubated in rotary kiln, and soaking time is 105 minutes; Come out from rotary kiln then, kiln end temperature is 442 ℃.After cooling, pulverizing, promptly become qualified chromium sesquioxide product; The chromium sesquioxide of not pulverizing after the cooling adds in the raw material in proportion as the returning charge roasting.Product master content 99.87%, aqueous fusion salt 0.11%, sexavalent chrome Cr
6+2.5ppm.
Example 4
(contain Cr with chromic acid
2O
3〉=99.5) with thick chromium sesquioxide, boric acid, under microcomputer control, mix, its material proportion is a chromic acid: thick chromium sesquioxide: boric acid=100: 6: 0.5 (weight); Quantitatively drop into rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1130 ℃; Reaction times is 60 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide; Chromium sesquioxide is incubated in rotary kiln, and soaking time is 115 minutes; Come out from rotary kiln then, kiln end temperature is 450 ℃.After cooling, pulverizing, promptly become qualified chromium sesquioxide product; The chromium sesquioxide of not pulverizing after the cooling adds in the raw material in proportion as the returning charge roasting.Product master content 99.9%, aqueous fusion salt 0.08%, sexavalent chrome Cr
6+3ppm.
Example 5
(contain Cr with chromic acid
2O
3〉=99.5) with thick chromium sesquioxide, boric acid, under microcomputer control, mix, its material proportion is a chromic acid: thick chromium sesquioxide: boric acid=100: 7: 0.6 (weight); Quantitatively drop into rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact with material and flow burning, in the slow uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1150 ℃; Reaction times is 60 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide; Chromium sesquioxide is incubated in rotary kiln, and soaking time is 120 minutes; Come out from rotary kiln then, kiln end temperature is 450 ℃.After cooling, pulverizing, promptly become qualified chromium sesquioxide product; The chromium sesquioxide of not pulverizing after the cooling adds in the raw material in proportion as the returning charge roasting.Product master content 99.9%, aqueous fusion salt 0.08%, sexavalent chrome Cr
6+3ppm.
Claims (7)
1. the method for a producing dichromium trioxide using chromic acid thermal decomposition continuous method, it is characterized in that: it may further comprise the steps:
A, be raw material, add returning charge, additive mixes with the chromic acid, returning charge account for total material 3～7%, additive accounts for 0.2～0.6% of total material; Returning charge is thick chromium sesquioxide, and additive is selected from boric acid, ammonium chloride, starch, wood chip;
B, under microcomputer control, with mixing of materials evenly after, quantitatively drop into insulation rotary kiln fuel injection end, make roasting fuel with liquefied gas, directly contact and flow burning with material, in the slowly uniform rotary course of rotary kiln, material enters the high-temperature zone rapidly and carries out roasting, and the high-temperature zone temperature is 1000～1150 ℃; Reaction times is 40～60 minutes; After the severe thermal decomposition reaction, chromic acid is converted into chromium sesquioxide;
C, chromium sesquioxide come out from rotary kiln be incubated for some time in rotary kiln after, promptly become qualified chromium sesquioxide product after cooling, pulverizing; Soaking time is 80～120 minutes;
The chromium sesquioxide of not pulverizing after the cooling in D, the C step adds in the raw material in proportion as the returning charge roasting.
2, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1 is characterized in that: additive is a boric acid in the steps A.
3, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1 is characterized in that: the high-temperature zone temperature is 1100～1150 ℃ among the step B.
4, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1 is characterized in that: the drop temperature of rotary kiln is 420～450 ℃.
5, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1, it is characterized in that: the rotary kiln as roasting apparatus in the B step is a double-decked insulation, the rotary kiln internal surface adopts that the fire resistant heat preserving composite light is brick builds insulation, and the rotary kiln outside surface is incubated with composite material.
6, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1 is characterized in that: far infrared remote sensing thermometric is adopted in temperature control in rotary kiln high-temperature zone, and forms closed cycle control with Liquified gas control valve.
7, the method for producing dichromium trioxide using chromic acid thermal decomposition continuous method according to claim 1 is characterized in that: adopt resistive connection to reveal electric dust-removing equipment in the calcination process and carry out dedusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021195617A CN1186265C (en) | 2002-05-25 | 2002-05-25 | Method of producing dichromium trioxide using chromic acid thermal decomposition continuous method |
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|---|---|---|---|
| CNB021195617A CN1186265C (en) | 2002-05-25 | 2002-05-25 | Method of producing dichromium trioxide using chromic acid thermal decomposition continuous method |
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| CN1459419A CN1459419A (en) | 2003-12-03 |
| CN1186265C true CN1186265C (en) | 2005-01-26 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101475217B (en) * | 2008-01-04 | 2011-06-01 | 中国科学院过程工程研究所 | A method for preparing pigment grade chromium oxide green by reducing chromium salt with gas reducing agent at low temperature |
| AR084183A1 (en) | 2010-12-08 | 2013-04-24 | Lanxess Deutschland Gmbh | PROCEDURE FOR THE PRODUCTION OF CHROME OXIDE (III) |
| CN102275991B (en) * | 2011-05-31 | 2013-08-28 | 重庆民丰化工有限责任公司 | Method for preparing chrome green by two-stage process |
| CN102408130B (en) * | 2011-09-09 | 2013-05-22 | 甘肃锦世化工有限责任公司 | Preparation method of hydrated chromium oxide green |
| CN102557136B (en) * | 2012-03-15 | 2014-04-02 | 甘肃锦世化工有限责任公司 | Method for improving color of chromium oxide green |
| CN103253709B (en) * | 2013-05-29 | 2015-02-18 | 甘肃锦世化工有限责任公司 | Method for producing chromium sesquioxide through hot method |
| CN104445408A (en) * | 2013-09-12 | 2015-03-25 | 中国科学院过程工程研究所 | Preparation method of yellow and green hue chromium oxide green pigment |
| CN108529677B (en) * | 2018-05-31 | 2020-10-16 | 甘肃锦世化工有限责任公司 | Production method of low-sulfur metallurgical-grade chromium oxide green |
| CN117105269A (en) * | 2023-09-15 | 2023-11-24 | 四川省银河化学股份有限公司 | A method for calcining metallurgical chromium oxide green with chromic anhydride |
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2002
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| CN1459419A (en) | 2003-12-03 |
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