CN102557137A - Method for producing sodium chromate and co-producing chrome-containing cast iron by three-stage process through un-calcium roasting - Google Patents

Method for producing sodium chromate and co-producing chrome-containing cast iron by three-stage process through un-calcium roasting Download PDF

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CN102557137A
CN102557137A CN2012100682779A CN201210068277A CN102557137A CN 102557137 A CN102557137 A CN 102557137A CN 2012100682779 A CN2012100682779 A CN 2012100682779A CN 201210068277 A CN201210068277 A CN 201210068277A CN 102557137 A CN102557137 A CN 102557137A
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roasting
stage
chromium
leaching
slag
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CN102557137B (en
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张忠元
李元魁
张宏军
杨昆山
谢希智
张天仁
杨亮亮
牛永阳
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Inner Mongolia Chromium Co., Ltd.
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JINSHI CHEMICAL INDUSTRY Co Ltd GANSU
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Abstract

The invention discloses a method for producing sodium chromate and co-producing chrome cast iron by a three-stage process through un-calcium roasting, aiming at solving the problems of low roasting efficiency and high energy consumption in the existing method for producing chromic salt by un-calcium roasting. The method for producing sodium chromate by the three-stage process through un-calcium roasting comprises the following steps of: A, mixing roasting material in a first stage, mixing chromite and sodium carbonate in proportion; B, roasting in the first stage, putting the mixed material in the first stage into a rotary kiln and performing oxidizing roasting; C, leaching and filtering in the first stage; D, performing second-stage roasting technology; and E, performing third-stage roasting technology. The leaching of clinker after roasting for three times is same as the roasting leaching in the first time and the second time, the grinding leaching is performed to the clinker by a wet grinding ball mill, the clinker is filtered by a belt type filter and the filtered chromium slag by three-stage roasting is obtained by filtering of the belt type filter, the filter liquor is sodium chromate alkali solution. Compared with the traditional un-calcium roasting technology, the method in the invention adopts the three-stage process un-calcium roasting technology and effectively reduces the mine consumption and the alkali consumption and has the energy-saving and emission-reducing effect.

Description

The three-stage process calcium-free roasting is produced the method for Sodium chromate-51Cr and coproduction chromium cast iron contained
Technical field
The invention belongs to inorganic salt chromium salt production field, relate to the method that the three-stage process calcium-free roasting is produced Sodium chromate-51Cr and coproduction chromium cast iron contained.
Background technology
Traditional chrominm salt production technology has mainly contained calcium sinter process and calcium-free roasting technology, and the calcium-free roasting difference maximum with the calcium sinter process is arranged is whether add calcareous material.
Calcium-free roasting technology relatively has the calcium sinter process, and because of bed drain purge is little, leaching rate is high, and content of 6-valence Cr ions is low in the slag, makes calcium-free roasting technology aspect environmental protection, have the advantage that has the calcium sinter process incomparable.Calcium-free roasting technology is under the prerequisite of not adding calcareous material, in order to reduce amount of liquid phase composition in the kiln, heavy addition return slag.The return slag amount that calcium-free roasting adds generally accounts for more than 50% of whole batching quality, and the chrome ore oxidation ratio is not high on the one hand, and roasting efficient is reduced greatly, and the ore deposit is consumed, alkaline consumption is higher, the mass energy consumption loss.
Summary of the invention
The purpose of this invention is to provide a kind of three-stage process calcium-free roasting and produce the method for Sodium chromate-51Cr and coproduction chromium cast iron contained, have the problem that roasting efficient is low, energy loss is big to solve existing calcium-free roasting production chromic salts.
The method that three-stage process calcium-free roasting of the present invention is produced Sodium chromate-51Cr may further comprise the steps:
A: one section roasting batch mixing: with chromite and soda ash proportional mixing.Chrome ore and soda ash blending ratio are by weight percentage: chrome ore 78～80%, soda ash 20～22%;
B: one section roasting: one section batch mixing dropped in the rotary kiln carry out oxidizing roasting, 1100 ℃～1250 ℃ of high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes;
C: one section leaches and filters: the grog that roasting obtains gets into the wet-type ball mill grinding when being cooled to 300～400 ℃, the control liquid-solid ratio is 65:35, and the slurries after the leaching directly filter through band filter, and filtrating is one section chromium acid sodium alkaline liquid.Cross filter residue and after drying, be used as two-stage calcination batching slag;
D: two-stage calcination technology: behind one section roasting oven dry ground-slag mill of oven dry, with the soda ash proportional mixing, chrome ore and soda ash blending ratio are by weight percentage: oven dry slag 78～80%, soda ash 20～22%.Mix back input rotary kiln and carry out the secondary oxidation roasting, 1100 ℃～1250 ℃ of secondary oxidation roasting high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes.Grog leaching behind the re-baking is with roasting leaching, and through the leaching of wet-type ball mill grinding, band filter filters, and filtrating is chromium acid sodium alkaline liquid.
E: three sections sinter processs: cross filter residue and behind the oven dry grinding, mixes with soda ash for the third time, No. three batch mixing chrome ores and soda ash blending ratio are by weight percentage: dry slag 83～85%, soda ash 15～17%.Mix the back and drop into rotary kiln and carry out three oxidizing roasting, 1100 ℃～1250 ℃ of three oxidizing roasting high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes.The leaching of grog after three roastings with once, the re-baking leaching, through the leaching of wet-type ball mill grinding, band filter filters, band filter is crossed the filtration chromium slag that filters three sections roastings, total Cr in the final chromium slag 2O 3Content is lower than 9%, total Fe 2O 3Content 55 ~ 60% is good chromium cast iron contained raw materials for metallurgy; Filtrating is chromium acid sodium alkaline liquid.
As another object of the present invention; The method of the filtration chromium slag coproduction chromium cast iron contained of three sections roastings that obtain with aforesaid method; After the filtration chromium slag muck of three sections roastings of above-mentioned steps E deposited oven dry; Press the chromium slag: silica: lime: after the mixed of coke=61.2～74.8:9～11:4.5～5.5:15.3～18.7, with the high-temperature electric arc stove smelt chromium cast iron contained.
Characteristics of the present invention are following: adopt the more traditional calcium-free roasting technology of three-stage process calcium-free roasting technology; Ore deposit consumption, alkaline consumption obviously lower; Tradition calcium-free roasting technology ore deposit consumption is generally 1.20 ~ 1.25, and alkaline consumption 1.05 ~ 1.08 reduce to 1.05 ~ 1.1 and adopt three-stage process calcium-free roasting technology can the ore deposit be consumed; Alkaline consumption reduces to 1.02 ~ 1.05, obviously plays the effect of energy-saving and emission-reduction;
Present method is 90 minutes～120 minutes because of material residence time in rotary kiln; And need not add the chromium slag; The more traditional calcium-free roasting process rate of roasting speed ratio is fast, so this working method does not need the large-sized rotary kiln device fabrication, general rotary kiln device can be produced; This makes that will to have the calcium sinter process to be transformed into calcium-free roasting technology more feasible, and calcium-free roasting technology is further promoted.
The calcium-free roasting technology that three section roasting production technique are more traditional has following some advantage: 1, do not add return slag; Roasting efficient improves greatly; And finishing slag discharge capacity is than lower (0.8～1.0 ton of the traditional calcium-free roasting technology ton chromic salts product bed drain purge of calcium-free roasting technology; 0.5 ~ 0.7 ton of three-stage process calcium-free roasting technology ton chromic salts product bed drain purge), and can effectively reduce ore deposit consumption, alkaline consumption, save energy consumptions simultaneously in a large number; 2, adopt three sections sinter processs, soda ash adds in batches, does not exist the interior liquid composition of kiln to cause the phenomenon of kiln body dross greatly; 3, production status is stable, does not need the large-sized rotary kiln device fabrication, and general rotary kiln device can be carried out calcium-free roasting production, and the roasting operating mode is easy to control; 4, the chromium transformation efficiency is high, and traditional calcium-free roasting technology chromium transformation efficiency is generally 70～75%, and adopts three sections sinter processs, and the chromium transformation efficiency can reach more than 80%; 5, iron oxide content is easy to enrichment in the final outer deslagging, and total chrome content is lower than 8.5% in the outer deslagging after three sections roastings, total Fe 2O 3But content enrichment to 55 ~ 60% is used for the electric arc furnace smelting ferrochrome, can reduce comprehensive cost.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Embodiment
Embodiment 1
A, one section calcining process: (main chemical composition is: Cr with 1000 tons of South Africa chromites 2O 342.8%, Fe 2O 326.57%, MgO 8.22%, Al 2O 318.62%, SiO 23.46%, V 2O 50.33%) is ground to 200 order percent of pass greater than more than 95%, with 250 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix, batch mixing accuracy 99%,
B, drop into rotary kiln at 1100 ℃ of roasting temperatures with 5 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.One section roasting chromium transformation efficiency 42.3%,
The grog that C, roasting obtain is when being cooled to 300 ℃; Get into the wet-type ball mill grinding, the control liquid-solid ratio is 65:35, and the slurries after the leaching directly filter through band filter; Filtrating is one section chromium acid sodium alkaline liquid, obtains the chromium acid sodium alkaline liquid 1175m of content 302g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Cross filter residue and after washing and drying, be used as two-stage calcination batching slag, amount to 796.8 tons, a slag ingredient analysis is following: Cr 2O 3Content 31.06%, Fe 2O 3Content 30.86%, MgO 10.31%, Al 2O 318.54%, SiO 23.22%, V 2O 50.42%.
D, two-stage calcination operation: 796.8 tons one section fired slags grinding to 200 order percent of pass is greater than more than 95%, with 205 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 2# rotary kiln at 1100 ℃ of roasting temperatures with 4.5 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.Two-stage calcination chromium transformation efficiency 58.25%, the grog cooling after the roasting, same section sinter process of leaching technology behind the band filter filtration washing, obtain the alkali solution 973m of content 290g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Two-stage calcination is crossed filter residue and is amounted to 557 tons of quality through oven dry, and two sections slag ingredient analyses are following: Cr 2O 3Content 18.52%, Fe 2O 3Content 44.17%, MgO 14.55%, Al 2O 315.25%, SiO 24.67%, V 2O 50.38%.
E, three sections sinter processs: 610 tons of two-stage calcination ground-slags are milled to 200 order percent of pass greater than more than 95%, with 105 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 3# rotary kiln at 1100 ℃ of roasting temperatures with 4 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.
Three sections roasting chromium transformation efficiencys 66.52%, the grog cooling after the roasting, same section of leaching technology, two step process behind the band filter filtration washing, obtain the alkali solution 463m of content 290g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.
The filtration chromium slag of three sections roastings amounts to 410 tons of quality through oven dry, and three sections slag ingredient analyses are following: Cr 2O 3Content 8.29%, Fe 2O 3Content 58.86%, MgO 20.05%, Al 2O 310.28%, SiO 27.09%, V 2O 50.49%.After three sections roastings, produce alkali solution 2633m altogether 3, alkali solution content 295.8g/l amounts to 778.8 tons of sodium dichromate 99 output, produces 410 tons of chromium slags altogether.The ore deposit consumption is 1.077 after these three sections roastings, and alkaline consumption is 1.034.Cr in the chromium slag after the 3rd section roasting 2O 3, Fe 2O 3Content amounts to 67.15%.
Embodiment 2
After the filtration chromium slag muck of three sections roastings of embodiment 1 step e deposited oven dry, press the chromium slag: silica: lime: after the mixed of coke=68:10:5:17, smelt into chromium cast iron contained according to existing technology through the high-temperature electric arc stove, chromium cast iron contained was up-to-standard.Ferrochrome slag sexavalent chrome after the smelting does not detect, and the ferrochrome slag muck is deposited.
Embodiment 3
A, one section calcining process: (main chemical composition is: Cr with 1000 tons of South Africa chromites 2O 342.8%, Fe 2O 326.57%, MgO 8.22%, Al 2O 318.62%, SiO 23.46%, V 2O 50.33%) is ground to 200 order percent of pass greater than more than 95%, with 266 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.
B, drop into rotary kiln at 1250 ℃ of roasting temperatures with 5 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.One section roasting chromium transformation efficiency 42.93%,
The grog that C, roasting obtain is when being cooled to 400 ℃; Get into the wet-type ball mill grinding, the control liquid-solid ratio is 65:35, and the slurries after the leaching directly filter through band filter; Filtrating is one section chromium acid sodium alkaline liquid, obtains the chromium acid sodium alkaline liquid 1192m of content 300g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Cross filter residue and after washing and drying, be used as two-stage calcination batching slag, amount to 781 tons, a slag ingredient analysis is following: Cr 2O 3Content 31.43%, Fe 2O 3Content 31.53%, MgO 10.86%, Al 2O 317.49%, SiO 22.98%, V 2O 50.44%.
D, two-stage calcination operation: 781 tons one section fired slags grinding to 200 order percent of pass is greater than more than 95%, with 205 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 2# rotary kiln at 1250 ℃ of roasting temperatures with 4.5 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.Two-stage calcination chromium transformation efficiency 57.86%, the grog cooling after the roasting, same section sinter process of leaching technology behind the band filter filtration washing, obtain the alkali solution 956m of content 290g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Two-stage calcination is crossed filter residue and is amounted to 564 tons of quality through oven dry, and two sections slag ingredient analyses are following: Cr 2O 3Content 18.25%, Fe 2O 3Content 45.21%, MgO 15.03%, Al 2O 313.09%, SiO 23.97%, V 2O 50.41%.
E, three sections sinter processs: 564 tons of two-stage calcination ground-slags are milled to 200 order percent of pass greater than more than 95%, with 110 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 3# rotary kiln at 1250 ℃ of roasting temperatures with 4 tons charging capacity per hour, material roasting residence time in kiln is 120 minutes, and material is not tied wall.Three sections roasting chromium transformation efficiencys 67.82%, the grog cooling after the roasting, same section of leaching technology, two step process behind the band filter filtration washing, obtain the alkali solution 472m of content 290g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.The filtration chromium slag of three sections roastings amounts to 410 tons of quality through oven dry, and three sections slag ingredient analyses are following: Cr 2O 3Content 8.06%, Fe 2O 3Content 59.62%, MgO 21.21%, Al 2O 39.29%, SiO 26.48%, V 2O 50.46%.After three sections roastings, produce alkali solution 2620m altogether 3, alkali solution content 302g/l amounts to 791 tons of sodium dichromate 99 output, produces 410 tons of chromium slags altogether.The ore deposit consumption is 1.061 after these three sections roastings, and alkaline consumption is 1.040.Cr in the chromium slag after the 3rd section roasting 2O 3, Fe 2O 3Content amounts to 67.68%.
F, the filtration chromium slag muck of three sections roastings of embodiment 1 step e deposited oven dry after, press the chromium slag: silica: lime: after the mixed of coke=74.8:11:5.5:18.7, smelt into chromium cast iron contained through the high-temperature electric arc stove, chromium cast iron contained is up-to-standard.Ferrochrome slag sexavalent chrome after the smelting does not detect, and the ferrochrome slag muck is deposited.
Embodiment 4
A, one section calcining process: (main chemical composition is: Cr with 1000 tons of South Africa chromites 2O 342.8%, Fe 2O 326.57%, MgO 8.22%, Al 2O 318.62%, SiO 23.46%, V 2O 50.33%) is ground to 200 order percent of pass greater than more than 95%, with 282 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.
B, drop into rotary kiln at 1200 ℃ of roasting temperatures with 5 tons charging capacity per hour, material roasting residence time in kiln is 100 minutes, and material has knot wall phenomenon, during long operational time, influences rotary kiln production.One section roasting chromium transformation efficiency 44.2%,
The grog that C, roasting obtain is when being cooled to 350 ℃; Get into the wet-type ball mill grinding, the control liquid-solid ratio is 65:35, and the slurries after the leaching directly filter through band filter; Filtrating is one section chromium acid sodium alkaline liquid, obtains the chromium acid sodium alkaline liquid 1228m of content 302g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Cross filter residue and after washing and drying, be used as two-stage calcination batching slag, amount to 775.3 tons, a slag ingredient analysis is following: a slag ingredient analysis is following: Cr 2O 3Content 30.82%, Fe 2O 3Content 31.45%, MgO 9.91%, Al 2O 316.85%, SiO 24.32%, V 2O 50.40%.
D, two-stage calcination operation: 775.3 tons one section fired slags grinding to 200 order percent of pass is greater than more than 95%, with 215 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 2# rotary kiln at 1200 ℃ of roasting temperatures with 4.5 tons charging capacity per hour, material roasting residence time in kiln is 100 minutes, and material is prone to the knot wall and influences production.Two-stage calcination chromium transformation efficiency 60.03%, the grog cooling after the roasting, same section sinter process of leaching technology behind the band filter filtration washing, obtain the alkali solution 969m of content 290g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.Two-stage calcination is crossed filter residue and is amounted to 540 tons of quality through oven dry, and two sections slag ingredient analyses are following: Cr 2O 3Content 17.68%, Fe 2O 3Content 46.28%, MgO 13.38%, Al 2O 314.35%, SiO 25.20%, V 2O 50.41%.
E, three sections sinter processs: 540 tons of two-stage calcination ground-slags are milled to 200 order percent of pass greater than more than 95%, with 115 tons of Jinchang soda ash (Na 2CO 3Content: 98.62%) mix batch mixing accuracy 99%.Drop into the 3# rotary kiln at 1200 ℃ of roasting temperatures with 4 tons charging capacity per hour, material roasting residence time in kiln is 100 minutes, and material knot wall is serious.Three sections roasting chromium transformation efficiencys 67.89%, the grog cooling after the roasting, same section of leaching technology, two step process behind the band filter filtration washing, obtain the alkali solution 426m of content 298g/l altogether 3, leaching rate is greater than 99%, and alkali solution gets into the back operation and produces the chromic salts product.The filtration chromium slag of three sections roastings amounts to 387 tons of quality through oven dry, and three sections slag ingredient analyses are following: Cr 2O 3Content 7.92%, Fe 2O 3Content 60.25%, MgO 22.135%, Al 2O 38.86%, SiO 25.35%, V 2O 50.55%.After three sections roastings, produce alkali solution 2623m altogether 3, alkali solution content 300.5g/l amounts to 788.2 tons of sodium dichromate 99 output, produces 387 tons of chromium slags altogether.The ore deposit consumption is 1.061 after these three sections roastings, and alkaline consumption is 1.040.Cr in the chromium slag after the 3rd section roasting 2O 3, Fe 2O 3Content amounts to 68.17%.
F, the filtration chromium slag muck of three sections roastings of embodiment 1 step e deposited oven dry after, press the chromium slag: silica: lime: after the mixed of coke=61.2:9:4.5:15.3, smelt into chromium cast iron contained through the high-temperature electric arc stove, chromium cast iron contained is up-to-standard.Ferrochrome slag sexavalent chrome after the smelting does not detect, and the ferrochrome slag muck is deposited.
The embodiment effect is that the high more good more effect of maturing temperature is good more, and promptly maturing temperature is that the effect of 1250 ℃ of embodiment 3 is best, and other embodiment takes second place.

Claims (2)

1. a three-stage process calcium-free roasting is produced the method for Sodium chromate-51Cr, it is characterized in that it may further comprise the steps:
A, one section roasting batch mixing: with chromite and soda ash proportional mixing, chrome ore and soda ash blending ratio are by weight percentage: chrome ore 78～80%, soda ash 20～22%;
B: one section roasting: one section batch mixing dropped in the rotary kiln carry out oxidizing roasting, 1100 ℃～1250 ℃ of high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes;
C: one section leaches and filters: the grog that roasting obtains gets into the wet-type ball mill grinding when being cooled to 300～400 ℃, the control liquid-solid ratio is 65:35, and the slurries after the leaching directly filter through band filter, and filtrating is one section chromium acid sodium alkaline liquid; Cross filter residue and after washing and drying, be used as two-stage calcination batching slag;
D: two-stage calcination technology: behind one section roasting oven dry ground-slag mill of oven dry, with the soda ash proportional mixing, chrome ore and soda ash blending ratio are by weight percentage: oven dry slag 78～80%, soda ash 20～22%; Mix back input rotary kiln and carry out the secondary oxidation roasting, 1100 ℃～1250 ℃ of secondary oxidation roasting high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes; Grog leaching technology behind the re-baking is with a roasting leaching technology, and through the leaching of wet-type ball mill grinding, band filter filters, and filtrating is chromium acid sodium alkaline liquid;
E: three sections sinter processs: cross filter residue and behind the oven dry grinding, mixes with soda ash for the third time, No. three batch mixing chrome ores and soda ash blending ratio are by weight percentage: dry slag 83～85%, soda ash 15～17%; Mix the back and drop into rotary kiln and carry out three oxidizing roasting, 1100 ℃～1250 ℃ of three oxidizing roasting high temperature zone temperatures, the thermal zone residence time of material is 90 minutes～120 minutes; Same, the re-baking technology of grog leaching technology after three roastings, through the leaching of wet-type ball mill grinding, band filter is crossed the filtration chromium slag that filters three sections roastings, and filtrating is chromium acid sodium alkaline liquid.
2. the method for the filtration chromium slag coproduction chromium cast iron contained of three sections roastings that obtain with the said method of claim 1; It is characterized in that: after the filtration chromium slag muck of three sections roastings of said step e is deposited oven dry; Press the chromium slag: silica: lime: after the mixed of coke=61.2～74.8:9～11:4.5～5.5:15.3～18.7, with the high-temperature electric arc stove smelt chromium cast iron contained.
CN201210068277.9A 2012-03-15 2012-03-15 Method for producing sodium chromate and co-producing chrome-containing cast iron by three-stage process through un-calcium roasting Expired - Fee Related CN102557137B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103224253A (en) * 2013-01-06 2013-07-31 内蒙古黄河铬盐股份有限公司 Method for calcium-free calcination production of sodium chromate and chromium-containing cast iron as co-product
CN106495220A (en) * 2016-11-28 2017-03-15 甘肃锦世化工有限责任公司 A kind of method of or pure oxygen baked for producing sodium chromate oxygen-enriched without calcium

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103224253A (en) * 2013-01-06 2013-07-31 内蒙古黄河铬盐股份有限公司 Method for calcium-free calcination production of sodium chromate and chromium-containing cast iron as co-product
CN106495220A (en) * 2016-11-28 2017-03-15 甘肃锦世化工有限责任公司 A kind of method of or pure oxygen baked for producing sodium chromate oxygen-enriched without calcium

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