CN103183384B - The method that a kind of preroast strengthening sub-molten salt decomposes chromite - Google Patents
The method that a kind of preroast strengthening sub-molten salt decomposes chromite Download PDFInfo
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- 150000003839 salts Chemical class 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005728 strengthening Methods 0.000 title claims abstract description 22
- 239000000047 product Substances 0.000 claims abstract description 29
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 239000012065 filter cake Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 10
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000007800 oxidant agent Substances 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 239000011268 mixed slurry Substances 0.000 claims abstract description 6
- 239000011651 chromium Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 37
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 34
- 229910052804 chromium Inorganic materials 0.000 claims description 34
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000005406 washing Methods 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000007790 solid phase Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000003828 vacuum filtration Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 7
- 150000001844 chromium Chemical class 0.000 abstract description 2
- 150000001845 chromium compounds Chemical class 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 17
- 229910052782 aluminium Inorganic materials 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 7
- 229910052749 magnesium Inorganic materials 0.000 description 7
- 229920001296 polysiloxane Polymers 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 239000002893 slag Substances 0.000 description 7
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 231100000086 high toxicity Toxicity 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- XMXNVYPJWBTAHN-UHFFFAOYSA-N potassium chromate Chemical compound [K+].[K+].[O-][Cr]([O-])(=O)=O XMXNVYPJWBTAHN-UHFFFAOYSA-N 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- PXLIDIMHPNPGMH-UHFFFAOYSA-N sodium chromate Chemical compound [Na+].[Na+].[O-][Cr]([O-])(=O)=O PXLIDIMHPNPGMH-UHFFFAOYSA-N 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
Abstract
The present invention relates to the processing technology field of chromite, in particular it relates to the method that a kind of preroast strengthening sub-molten salt decomposes chromite.The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, comprises the following steps: 1) chromite raw material is added thermal bake-out, obtain chromite product of roasting；Wherein, described sintering temperature is 700～1200 DEG C；Roasting time is 20min～1h；2) step 1) obtains chromite product of roasting to mix with aqueous slkali, be passed through oxidant, make generation sub-molten salt react；3) dilute step 2) the mixed slurry product that obtains, then carry out solid-liquid separation, obtain chromatedsolution and filter cake；4) chromatedsolution step 3) obtained obtains chromate product after remove impurity processes.The present invention is easily operated, and the chromatedsolution after solid-liquid separation, through remove impurity, can be directly produced chromate product, it is possible to workshop section follow-up with chromium salt factory direct interface produces chromium compound downstream product.
Description
Technical field
The present invention relates to the processing technology field of chromite, in particular it relates to a kind of preroast strengthening Asia is molten
Salt decomposes the method for chromite.
Background technology
Chromic salts industry is the important foundation primary industry that chemical industry intersects with metallurgy, is one important point of inorganic chemicals industry
?.Chromate is important inorganic chemical industry basic material, is used for producing potassium dichromate (sodium, lithium), chromic anhydride, oxygen
Change the product such as chromium, crome metal.Having Industrialized processing technique both at home and abroad is to have calcium roasting technique and calcium-free roasting technique,
Reaction temperature is 1200 DEG C, and energy resource utilization rate is low, and discharges substantial amounts of high toxicity chromium slag.Wherein there is calcium roasting
Technique, produces 1t chromic salts product and produces 2.5～3t high toxicity chromium slags, and in slag, total chromium reaches 5%；Calcium-free roasting utilizes and returns
Slag all replaces calcic filler, greatly reduces the discharge capacity of chromium slag, and product bed drain purge per ton is by original 2.5t fall
As little as 0.8t, but do not tackle the problem at its root, chromium slag serious environment pollution, it is listed in China for a long time and pollutes industry
First of.
Situation low for chromic salts traditional industries resource utilization, that energy consumption is high, pollution is heavy, Chinese Academy of Sciences's process work
Journey institute develops low temperature sub-molten salt liquid phase oxidation, and using sodium hydroxide or potassium hydroxide solution is fused salt, logical
Enter air or oxygen-enriched air carries out gas-liquid-solid phase reaction, prepare sodium chromate or Neutral potassium chromate.This technology not only can be
300～550 DEG C are decomposed chromites, and chromium conversion ratio is higher than 99%, and the chromium quantity of slag is few, produce 1t product only produce 0.8～
The rich scum of 1.5t.But this technique alkali ore deposit higher (generally 5:1～7:1), temperature high (generally 320 DEG C～
340 DEG C), most importantly technique the most oversize (generally 6h).Sub-molten salt chromium-salt clean production process technology conduct
The technology of new research and development, also needs to carry out substantial amounts of technical optimization work.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, sub-molten salt liquid phase oxidation technology is entered
The optimization of one step.The method technological operation is simple, produces without other pollutant, reduces alkali ore deposit ratio and reaction temperature,
Substantially reduce the time required for reaction, optimize sub-molten salt liquid phase oxidation technique, especially can process low product
Position chromite, is a method being worthy of popularization.
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, comprises the following steps:
1) chromite raw material is added thermal bake-out, obtain chromite product of roasting；Wherein, described sintering temperature be 700～
1200℃；Roasting time is 20min～1h；
2) step 1) obtains chromite product of roasting to mix with aqueous slkali, be passed through oxidant, make generation sub-molten salt
Reaction, it is thus achieved that mixed slurry product；
3) dilute step 2) the mixed slurry product that obtains, make Cr VI and water-soluble component enter liquid phase,
Then carry out solid-liquid separation, obtain chromatedsolution and filter cake；
4) chromatedsolution step 3) obtained obtains chromate product after remove impurity processes.
The method that preroast strengthening sub-molten salt according to the present invention decomposes chromite, step 2) described aqueous slkali and ferrochrome
Ore deposit product of roasting mass ratio is 2:1～4:1；Described sub-molten salt reaction temperature is 300～320 DEG C, and the response time is 1～3
h。
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, raw materials used chromite is that chromium content is more than
The chromite of 27%, especially chromium content 27%～35.7% chromite.
The method that sub-molten salt decomposes chromite is strengthened in preroast according to the present invention, and roasting equipment described in step 1) is excellent
Select Muffle furnace or atmosphere furnace.
The method that sub-molten salt decomposes chromite is strengthened in preroast according to the present invention, and chromite raw material described in step 1) is excellent
Choosing is crushed to below 250 mesh.
The method that preroast strengthening sub-molten salt according to the present invention decomposes chromite, step 2) described oxidant is that oxygen contains
Weight range 18%～99.9% air, oxygen-enriched air or purity oxygen, intake presses oxygen weight and ferrochrome in oxidant
The mass ratio of ore deposit raw material is that 2:1～4:1 is passed through.
The method that preroast strengthening sub-molten salt according to the present invention decomposes chromite, step 2) described aqueous slkali is concentration
The sodium hydroxide of 75%～90% or potassium hydroxide solution.
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, step 2) mixed slurry that obtains after reaction
Product contains KOH, K2CrO4, water-solubility impurity and iron-rich tailings.
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, after countercurrent washing, alkali is concentrated recovery,
Enter step 2) recycle.
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, step 3) is specifically, dilution step 2)
The product obtained, adds water (amount of water is 3:1～6:1, preferably 5:1 generally according to liquid-solid mass ratio) and makes whole
Cr VI and part aqueous impurity composition enter liquid phase, carry out solid-liquor separation operation, obtain chromatedsolution and
Filter cake, this filter cake through countercurrent washing, washes away residual chromium hydrochlorate and alkali, obtains ferrum oxide, magnesium oxide and silicate
Solid-phase mixture, returns step 2 after alkali concentrates in washings), recycle.
The method that preroast strengthening sub-molten salt according to the present invention decomposes chromite, step 3) uses vacuum filtration machine to enter
Row solid-liquid separation.
The method that preroast strengthening sub-molten salt according to the present invention decomposes chromite, the filter cake that step 3) obtains is through adverse current
Washing, obtains solid-phase mixture.
The method that the preroast strengthening sub-molten salt of the present invention decomposes chromite, the chromate product that step 4) prepares is permissible
Carry out the production of chromium system downstream product.
Present invention have the advantage that and good effect:
(1) with chromite as raw material, in Muffle furnace, temperature is set more than 700 DEG C, roasting a period of time, chromium
Iron mine spinel structure, by high temperature, exposes the Cr inside spinelle2O3, in potassium hydroxide highly concentrated solution
Directly there is oxidation reaction, obtain chromate product.In course of reaction, alkali ore deposit is reduced to below 4:1 than by 5:1,
Reaction temperature is reduced to less than 320 DEG C by 340 DEG C, within the response time is shortened to 3h by 6h, greatly improves
Production efficiency.
(2) chromite after the present invention is roasting in high concentration alkali solution, oxidation step dissolution chromate, due to
Reaction medium is concentrated alkali solution, can carry out dispensing by chemical theory amount, so that the solid-liquid of reaction residual liquor divides
From easily realizing, it is easy to operation, the chromatedsolution after solid-liquid separation, through remove impurity, can be directly produced chromate and produce
Product, it is possible to workshop section follow-up with chromium salt factory direct interface produces chromium compound downstream product.
Accompanying drawing explanation
The preroast strengthening sub-molten salt of Fig. 1 present invention decomposes the process chart of the method for chromite.
Detailed description of the invention
Embodiment 1
Use chromium content 35.31%, iron content 21.38%, content of magnesium 5.45%, aluminum content 7.52%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First at Muffle kiln roasting 20min, sintering temperature is 700 DEG C.
Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is chromite 30.0g,
Potassium hydroxide is 4:1 with the mass ratio of chromite, and alkaline concentration is 80%.Reaction mass is joined in reactor,
Being passed through purity oxygen (oxygen content 99.9%) 150L/h, reaction temperature is 300 DEG C, and the response time is 2h, and reaction terminates
After be cooled to room temperature discharging, add a certain amount of water, carry out solid-liquid separation, filter cake, through repeatedly washing, is washed till nothing
Till chromic feature, detection chromium conversion ratio is 99.25%.Obtain yellow dry filter cake 14.36g, containing chromium 0.55%,
Silicon 1.12%, aluminum 0.56%.
Embodiment 2
Use chromium content 35.31%, iron content 21.38%, content of magnesium 5.45%, aluminum content 7.52%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First Muffle kiln roasting 1 hour, sintering temperature is
900℃.Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is chromite
30.0g, potassium hydroxide is 4:1 with the mass ratio of chromite, and alkaline concentration is 80%.Reaction mass is joined instead
Answering in still, be passed through purity oxygen (oxygen content 99.9%) 150L/h, reaction temperature is 320 DEG C, and the response time is 3h,
Reaction terminate after be cooled to room temperature discharging, add a certain amount of water, carry out solid-liquid separation, filter cake through repeatedly washing,
Till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 99.84%.Obtain yellow dry filter cake 16.76g, contain
Chromium 0.10%, silicon 0.88%, aluminum 0.56%.
Embodiment 3
Use chromium content 35.31%, iron content 21.38%, content of magnesium 5.45%, aluminum content 7.52%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First in Muffle kiln roasting half an hour, sintering temperature is
1200℃.Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is ferrochrome
Ore deposit 30.0g, potassium hydroxide is 4:1 with the mass ratio of chromite, and alkaline concentration is 80%.Reaction mass is added
In reactor, being passed through purity oxygen (oxygen content 99.9%) 150L/h, reaction temperature is 300 DEG C, and the response time is
2h, reaction is cooled to room temperature discharging after terminating, and adds a certain amount of water, carries out solid-liquid separation, and filter cake is through repeatedly
Washing, till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 99.42%.Obtain yellow dry filter cake 16.22g,
Containing chromium 0.38%, silicon 0.62%, aluminum 0.66%.
Embodiment 4
Use chromium content 35.31%, iron content 21.38%, content of magnesium 5.45%, aluminum content 7.52%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First in Muffle kiln roasting half an hour, sintering temperature is
700℃.Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is chromite
30.0g, potassium hydroxide is 3:1 with the mass ratio of chromite, and alkaline concentration is 80%.Reaction mass is joined instead
Answering in still, be passed through purity oxygen (oxygen content 99.9%) 150L/h, reaction temperature is 320 DEG C, and the response time is 2h,
Reaction terminate after be cooled to room temperature discharging, add a certain amount of water, carry out solid-liquid separation, filter cake through repeatedly washing,
Till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 99.05%.Obtain yellow dry filter cake 15.7g, containing chromium
0.64%, silicon 1.21%, aluminum 0.91%.
Embodiment 5
Use chromium content 27%, iron content 21.38%, content of magnesium 5.45%, aluminum content 7.52%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First in Muffle kiln roasting half an hour, sintering temperature is
700℃.Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is chromite
30.0g, potassium hydroxide is 2:1 with the mass ratio of chromite, and alkaline concentration is 80%.Reaction mass is joined instead
Answering in still, be passed through purity oxygen (oxygen content 99.9%) 200L/h, reaction temperature is 300 DEG C, and the response time is 1h,
Reaction terminate after be cooled to room temperature discharging, add a certain amount of water, carry out solid-liquid separation, filter cake through repeatedly washing,
Till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 91.57%.Obtain yellow dry filter cake 17.9g, containing chromium
4.99%, silicon 1.25%, aluminum 1.27%.
Embodiment 6
Use chromium content 35.7%, iron content 21.08%, content of magnesium 5.50%, aluminum content 7.43%, silicone content 1.30%
Chromite be raw material, be crushed to below 250 mesh.First Muffle kiln roasting 1 hour, sintering temperature is
700℃.Reacting as raw material and sodium hydroxide solution generation sub-molten salt with baked chromite, formula is chromite
30.0g, sodium hydroxide is 4:1 with the mass ratio of chromite, and alkaline concentration is 75%.Reaction mass is joined instead
Answering in still, be passed through air (oxygen content 18%) 150L/h, reaction temperature is 300 DEG C, and the response time is 3h, instead
Room temperature discharging should be cooled to after terminating, add a certain amount of water, carry out solid-liquid separation, filter cake through repeatedly washing,
Till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 99.50%.Obtain yellow dry filter cake 15.36g, contain
Chromium 0.51%, silicon 1.20%, aluminum 0.52%.
Embodiment 7
Use chromium content 27%, iron content 25.18%, content of magnesium 5.30%, aluminum content 7.38%, silicone content 1.60%
Chromite be raw material, be crushed to below 250 mesh.First at atmosphere kiln roasting 20min, sintering temperature is
1200℃.Reacting as raw material and potassium hydroxide solution generation sub-molten salt with baked chromite, formula is ferrochrome
Ore deposit 30.0g, sodium hydroxide is 3:1 with the mass ratio of chromite, and alkaline concentration is 90%.Reaction mass is added
In reactor, being passed through purity oxygen (oxygen content 99.9%) 200L/h, reaction temperature is 320 DEG C, and the response time is
2h, reaction is cooled to room temperature discharging after terminating, adds a certain amount of water, carry out solid-liquid separation, and filter cake is through repeatedly
Washing, till being washed till the feature of non-hexavalent chromium, detection chromium conversion ratio is 99.30%.Obtain yellow dry filter cake 16.26g,
Containing chromium 0.47%, silicon 1.13%, aluminum 0.72%.
Claims (5)
1. the method that preroast strengthening sub-molten salt decomposes chromite, comprises the following steps:
1) chromite raw material is added thermal bake-out, obtain chromite product of roasting；Wherein, described sintering temperature be 700～
1200℃；Roasting time is 20min～1h；Described chromite raw material be chromium content 27%～35.7% ferrochrome
Ore deposit；
2) by step 1) obtain chromite product of roasting and mix with aqueous slkali, by oxygen weight and chromite in oxidant
The mass ratio of raw material is that 2:1～4:1 is passed through oxidant, makes generation sub-molten salt react, it is thus achieved that mixed slurry product；Its
In, described aqueous slkali and chromite product of roasting mass ratio are 2:1～4:1；Described sub-molten salt reaction temperature be 300～
320 DEG C, the response time is 1～3h；Described aqueous slkali be mass percent concentration 75%～90% sodium hydroxide or
Potassium hydroxide solution；
3) by liquid-solid mass ratio 3:1～6:1 dilute step 2) the mixed slurry product that obtains, make Cr VI and
Water-soluble component enters liquid phase, then carries out solid-liquid separation, obtains chromatedsolution and filter cake；
4) by step 3) chromatedsolution that obtains obtains chromate product after remove impurity processes.
The method that preroast the most according to claim 1 strengthening sub-molten salt decomposes chromite, it is characterised in that
Step 2) described oxidant be oxygen content scope 18%～99.9% air, oxygen-enriched air or purity oxygen.
The method that preroast the most according to claim 1 strengthening sub-molten salt decomposes chromite, it is characterised in that
Step 3) use vacuum filtration machine to carry out solid-liquid separation.
The method that preroast the most according to claim 1 strengthening sub-molten salt decomposes chromite, it is characterised in that
Step 3) filter cake that obtains through countercurrent washing, obtain solid-phase mixture.
5. strengthening, according to the preroast described in claim 1 or 4, the method that sub-molten salt decomposes chromite, its feature exists
In, after described countercurrent washing, alkali is concentrated recovery, enters step 2) recycle.
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| CN104512930A (en) * | 2013-09-30 | 2015-04-15 | 湖北振华化学股份有限公司 | Method for producing chromate by liquid-phase catalytic oxidation of chromite |
| CN107523844B (en) * | 2017-09-07 | 2019-03-26 | 中国科学院青海盐湖研究所 | The method for preparing bichromate using ferrochrome |
| CN107523839B (en) * | 2017-09-07 | 2019-03-26 | 中国科学院青海盐湖研究所 | It is electrolysed ferrochrome Joint Production chrome oxide green, the method for iron oxide red and high-purity chromate |
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| CN1410358A (en) * | 2001-10-08 | 2003-04-16 | 中国科学院过程工程研究所 | Clean production method of potassium chromate |
| CN101045559A (en) * | 2007-04-19 | 2007-10-03 | 甘肃锦世化工有限责任公司 | Method for producing sodium chromate non-calcium calcined by ferrochrome mine |
| CN101725356A (en) * | 2008-10-15 | 2010-06-09 | 深圳市海川实业股份有限公司 | Space enclosing structure of underground building shaft and shield machine cutting construction method thereof |
| CN101817561A (en) * | 2010-04-12 | 2010-09-01 | 中国科学院过程工程研究所 | Method for pollution-free production of sodium chromate by pressure leaching of chromite |
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| US7220394B2 (en) * | 2002-10-30 | 2007-05-22 | Council Of Scientific And Industrial Research | Process for simultaneous recovery of chromium and iron from chromite ore processing residue |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1410358A (en) * | 2001-10-08 | 2003-04-16 | 中国科学院过程工程研究所 | Clean production method of potassium chromate |
| CN101045559A (en) * | 2007-04-19 | 2007-10-03 | 甘肃锦世化工有限责任公司 | Method for producing sodium chromate non-calcium calcined by ferrochrome mine |
| CN101725356A (en) * | 2008-10-15 | 2010-06-09 | 深圳市海川实业股份有限公司 | Space enclosing structure of underground building shaft and shield machine cutting construction method thereof |
| CN101817561A (en) * | 2010-04-12 | 2010-09-01 | 中国科学院过程工程研究所 | Method for pollution-free production of sodium chromate by pressure leaching of chromite |
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