CN104152704B - A kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag - Google Patents
A kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag Download PDFInfo
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Abstract
The invention discloses a kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag, wherein, the method comprises: vanadium chromium slag and first are carried out the first roasting containing sodium material by (1), and solid-liquid separation after the product after the first roasting being carried out water logging, obtain the first solid phase and the first liquid phase; (2) described first liquid phase is carried out solid-liquid separation after precipitation, obtain second solid phase and second liquid phase; (3) described first solid phase and second are carried out the second roasting containing sodium material, and solid-liquid separation after the product after the second roasting being carried out water logging, obtain the 3rd solid phase and the 3rd liquid phase; (4) described second liquid phase carried out contacting with described 3rd liquid phase and carry out solid-liquid separation after precipitating, obtaining the 4th solid phase and the 4th liquid phase; (5) described second solid phase and the 4th solid phase are carried out calcining vanadium extraction; (6) the 4th liquid phase is carried out reducing heavy chromium.By method of the present invention, can simply and with high yield Separation and Recovery vanadium and chromium from vanadium chromium slag.
Description
Technical field
The present invention relates to a kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag.
Background technology
Vanadium and chromium are important strategic resources, are widely used in the fields such as national defence, metallurgy, material and chemical industry.But vanadium and chromium production, utilize in process, inevitably to produce pentavalent vanadium and sexavalent chrome.As everyone knows, pentavalent vanadium and sexavalent chrome are as heavy metal, and its compound has strong toxicity, and serious harm environment also produces huge damage to human body.According to media reports, in the region that heavy metal contamination is heavier, the sickness rate of cancer is obviously higher.Based on environmental hazard and the consideration to HUMAN HEALTH and the added value of heavy metal own, pentavalent vanadium and sexavalent chrome must carry out process before discharge and reclaim.Because vanadium is extremely close with chromium character, it flows to substantially identical in hydrometallurgy, therefore how to implement the key that the separation of vanadium chromium is vanadium waste liqouor.
Up to the present, from vanadium chromium slag, the method for Extraction and separation vanadium chromium mainly contains containing the roasting of sodium material and sub-molten salt method, and the vanadium chromium slag after roasting is leached, and its vanadium contained and chromium will be dissolved in solution simultaneously, then are separated with chromium by vanadium from solution.But, be separated respectively from same solution simultaneously vanadium various with the technological step of chromium, is separated comparatively difficult.
CN102329964B discloses a kind of processing method of Separation and Recovery vanadium and chromium from vanadium chromium reduced waste residue, wherein, the method mainly comprises: (1) washes the water-soluble salt in vanadium chromium reduced waste residue with water, obtain filter cake (I) and washings after filtering respectively, after washings evaporative crystallization, separate out water-soluble salt crystal; (2) filter cake (I) is placed in basic solution, and adds the Oxidation Leaching that oxygenant carries out vanadium, the slurry obtained after leaching obtains filter cake (II) and leach liquor after filtering; (3) filter cake (II) that step (2) obtains is washed with water, obtain containing vanadium washings and filter cake (III) after filtering respectively; (4) what obtain step (3) carries out evaporation concentration containing vanadium washings, obtains concentrated solution; (5) concentrated solution that leach liquor step (2) obtained and step (4) obtain merges, and crystallisation by cooling obtains sodium vanadate crystal; (6) filter cake (III) of step (3) is leached in sulphuric acid soln to the chromium extracted wherein, obtain liquid-solid mixed slurry; (7) add oxidizing iron ion wherein in the slurry obtained to step (6) and adjust ph with precipitated impurities, carry out filtering separation, obtain acid leaching solution and finishing slag respectively; (8) carry out evaporative crystallization to the acid leaching solution that step (7) obtains, precipitate is basic chromium sulfate.The obtained sodium vanadate product purity of the method more than 93%, Cr in basic chromium sulfate
2o
3content can reach 24%, Fe content and be less than 0.1%, meets the requirement for basic chromium sulfate I series products in HG/T2678-2007.But, the object of the method process is vanadium chromium reduced waste residue, in vanadium chromium reduced waste residue, vanadium exists with the oxyhydroxide of tetravalence or three valence states or oxide form, can be oxidized under condition in the above-mentioned methods, and vanadium chromium thing is vanadium picotite mutually in vanadium chromium slag, be difficult to selective oxidation vanadium under the condition of aforesaid method.In addition, the method steps of this patent is various comparatively complicated, is unfavorable for suitability for industrialized production.
Summary of the invention
The object of the invention is to overcome existing from vanadium chromium slag step various, separation difficulty when Separation and Recovery vanadium and chromium, be unfavorable for the defect of suitability for industrialized production, provide a kind of step few, be separated simple and be conducive to the method for Separation and Recovery vanadium and chromium from vanadium chromium slag with suitability for industrialized production.
To achieve these goals, the invention provides a kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag, wherein, the method comprises:
(1) vanadium chromium slag and first are carried out the first roasting containing sodium material, and solid-liquid separation after the product after the first roasting being carried out water logging, obtain the first solid phase and the first liquid phase;
(2) described first liquid phase is carried out solid-liquid separation after precipitation, obtain second solid phase and second liquid phase;
(3) described first solid phase and second are carried out the second roasting containing sodium material, and solid-liquid separation after the product after the second roasting being carried out water logging, obtain the 3rd solid phase and the 3rd liquid phase;
(4) described second liquid phase carried out contacting with described 3rd liquid phase and carry out solid-liquid separation after precipitating, obtaining the 4th solid phase and the 4th liquid phase;
(5) described second solid phase and the 4th solid phase are carried out calcining vanadium extraction;
(6) the 4th liquid phase is carried out reducing heavy chromium.
By adopting method of the present invention, can the successfully Separation and Recovery from vanadium chromium slag by vanadium and chromium, achieve the step by step arithmetic to vanadium and chromium from vanadium chromium slag, and step is few, simple to operate, be beneficial to suitability for industrialized production, especially one of the present invention preferred embodiment in, the yield of vanadium is up to more than 90 % by weight, and the yield of chromium is up to more than 93 % by weight.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
The invention provides a kind of method of Separation and Recovery vanadium and chromium from vanadium chromium slag, wherein, the method comprises:
(1) vanadium chromium slag and first are carried out the first roasting containing sodium material, and solid-liquid separation after the product after the first roasting being carried out water logging, obtain the first solid phase and the first liquid phase;
(2) described first liquid phase is carried out solid-liquid separation after precipitation, obtain second solid phase and second liquid phase;
(3) described first solid phase and second are carried out the second roasting containing sodium material, and solid-liquid separation after the product after the second roasting being carried out water logging, obtain the 3rd solid phase and the 3rd liquid phase;
(4) described second liquid phase carried out contacting with described 3rd liquid phase and carry out solid-liquid separation after precipitating, obtaining the 4th solid phase and the 4th liquid phase;
(5) described second solid phase and the 4th solid phase are carried out calcining vanadium extraction;
(6) the 4th liquid phase is carried out reducing heavy chromium.
Method according to the present invention goes for carrying out to this area various vanadium chromium slag the process that vanadium is separated with chromium, and such as described vanadium chromium slag can be the vanadium chromium slag of gained after blowing from vanadium-bearing hot metal.Further, method of the present invention is applicable to the process of the vanadium chromium slag to any vanadium and chromium content, and under preferable case, be specially adapted in the vanadium chromium slag of method process of the present invention, the content of v element is 2-35 % by weight, and the content of chromium element is 1.5-40 % by weight.More preferably, in described vanadium chromium slag, the content of v element is 3-10 % by weight, and the content of chromium element is 2-10 % by weight.
According to the present invention, in step (1), first described vanadium chromium slag and described first are carried out the first roasting containing sodium material.Described vanadium chromium slag, in the first roasting process, owing to there occurs the oxidized process of vanadium, makes the product after the first roasting carry out solid-liquid separation after water logging, most vanadium can be leached, and be substantially retained in the first solid phase by chromium.In order to obtain higher vanadium yield and be leached by less chromium, under preferable case, the condition of described first roasting comprises: temperature is 550-800 DEG C, and the time is 50-180min.More preferably, the condition of described first roasting comprises: temperature is 550-780 DEG C, and the time is 60-180min.Still more preferably, the condition of described first roasting comprises: temperature is 700-780 DEG C, and the time is 90-120min.
According to the present invention, do not limit especially containing sodium material described first, what can adopt the conventional sodium roasting containing vanadium material contains sodium material, under preferable case, described first is one or more in sodium carbonate, sodium bicarbonate and sodium hydroxide containing sodium material, is more preferably sodium carbonate and/or sodium bicarbonate.
In described first roasting, described vanadium chromium slag and the first consumption containing sodium material are not particularly limited, and can adjust according to the actual composition of vanadium chromium slag.Under preferable case, in described first of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of V element for 2-10:1, be more preferably 2.5-7:1 (in the present invention, described " the described vanadium chromium slag in V element " refers to the molar weight of the v element in described vanadium chromium slag to represent the consumption of vanadium chromium slag, in like manner " in Na element containing sodium material ", " the vanadium chromium slag in Cr element " etc. for explaining).
According to the present invention, in step (1), the product after described first roasting is carried out solid-liquid separation after water logging, the first solid phase and the first liquid phase can be obtained.Wherein, in the first solid phase, remain the vanadium of part and most chromium, containing most vanadium soluble salt in described first liquid phase.In the present invention, to the water logging of step (1), there is no particular limitation, leaches and the object that do not leach of chromium as long as can realize most vanadium in the product after by described first roasting.Under preferable case, the condition of the water logging in step (1) comprises: temperature is 15-100 DEG C, and the time is 5-60min.In order to obtain better leaching effect, more preferably, the condition of the water logging in step (1) comprises: temperature is 25-100 DEG C, and the time is 30-60min.
The water that water logging adopts can be one or more in deionized water, distilled water, tap water, industrial reuse water etc., but consider for the aspect reduced costs, preferred employing goes industrial reuse water and/or tap water to carry out described water logging (selection of the water for water logging is here applicable to the water logging of step (1) and step (3) simultaneously, but the water logging of the step of should be understood that (1) and step (3) can select different types of water to carry out leaching to process).In the present invention, the weight ratio of water in the water logging of the product after the first roasting and step (1) is not particularly limited, the ratio that this area routine will use when carrying out water logging can be adopted.But consider for the aspect of the yield and saving water resource that improve vanadium, preferably, in the water logging of step (1), the weight ratio (liquid-solid ratio) of the product after water and described first roasting is 1.2-5:1, be more preferably 1.2-3:1, be further preferably 1.8-2.2:1.
According to the present invention, in step (2), described first liquid phase is carried out solid-liquid separation after precipitation, obtain second solid phase and second liquid phase, wherein, described second solid phase refers to the solid product containing vanadium after precipitation, and second liquid phase is vanadium wastewater.
In the present invention, the restriction not any to the method for described precipitation, ammonium salt precipitation or hydrolysis precipitation can be adopted: wherein, described ammonium salt precipitation refers to and adopts ammonium ion replacing water sodium ion in liquor, and form a process of ammonium poly-vanadate with vanadium, ammonium salt can be such as one or more in ammonium sulfate, ammonium chloride, bicarbonate of ammonia etc., the solid product containing vanadium of what ammonium salt precipitation obtained is ammonium poly-vanadate; Under described hydrolysis precipitation refers to acidic conditions, by the process that vanadium is separated out with precipitation forms, what hydrolysis precipitation obtained is hydration Vanadium Pentoxide in FLAKES containing the solid product of vanadium.
In the process of described precipitation, no matter adopt which kind of precipitation method of above-mentioned two kinds, all need to carry out in acid condition, carry out solid-liquid separation after precipitation, the second liquid phase obtained is vanadium wastewater, and this vanadium wastewater is acid too, preferably, the pH of described second liquid phase (vanadium wastewater) is preferably 1.5-5.5, is more preferably 2-5, is further preferably 2-3.5.At this, provide the acid of described acidic conditions can be organic acid, mineral acid, be preferably sulfuric acid and/or hydrochloric acid.
According to the present invention, can directly the second solid phase of step (2) gained be carried out calcining to extract vanadium, or carry out calcining to extract vanadium together with the 4th solid phase that step (4) obtains, and described second solid phase and the 4th solid phase carried out calcining vanadium extraction include this two kinds of modes in step of the present invention (5).Described calcining can be the method for the calcining precipitation product of ability routine, does not repeat them here.
According to the present invention, in step (3), described first solid phase and second are carried out the second roasting containing sodium material, owing to carrying out water logging and solid-liquid separation after the first roasting, most vanadium is separated, improve material performance simultaneously, thus can the oxidation of more favourable vanadium chromium in the second roasting process, thus be more conducive to the yield improving vanadium and chromium.Preferably, the condition of described second roasting comprises: temperature is 820-950 DEG C, and the time is 1-4h.More preferably, described second roasting condition comprises: temperature is 840-920 DEG C, and the time is 2-4h.
According to the present invention, described second containing sodium material can be conventional for containing adopt in the sodium roasting method of chromium material containing sodium additives, be such as one or more in sodium oxide, sodium hydroxide, sodium carbonate and sodium bicarbonate.
According to the present invention, in described second roasting, described second solid phase and the second consumption containing sodium material are not particularly limited, can adjust in wider scope.Under preferable case, in described second of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of Cr element for 3-15:1, be more preferably 4-8:1, be further preferably 4.2-7.4:1.In the present invention, the filter residue of described second solid phase can be dried material also can be solid-liquid separation gained after the water logging of step (1), for convenience's sake, it is preferably the filter residue of solid-liquid separation gained after the water logging of step (1), therefore described second solid phase can containing a small amount of water, the such as water of less than 20 % by weight.
According to the present invention, in step (3), product after second roasting is carried out solid-liquid separation after water logging, the 3rd solid phase and the 3rd liquid phase will be obtained, wherein, containing most chromium and a small amount of vanadium in 3rd liquid phase, and the 3rd solid phase is the residue of final gained, vanadium in described vanadium chromium slag and chromium can comparatively fully leach by the present invention, in the preferred embodiment of the present invention, in described 3rd solid phase, the content of v element is less than 0.25 % by weight, and the content of chromium element is less than 0.31 % by weight.In the present invention, to the water logging of step (3), there is no particular limitation, as long as can realize the object that in the product after by described second roasting, most chromium leaches.Under preferable case, the condition of the water logging in step (3) comprises: temperature is 15-100 DEG C, and the time is 5-60min.In order to obtain better leaching effect, more preferably, the condition of the water logging in step (3) comprises: temperature is 25-50 DEG C, and the time is 20-30min.
The present invention is not particularly limited the weight ratio of water in the water logging in the product after the second roasting and step (3), can adopt the ratio that this area routine will use when carrying out water logging.But for the raising yield of chromium and the consideration of saving water resource, preferably, in step (3), the mass ratio (liquid-solid ratio) of the product after water and described second roasting is 1.2-5:1, be more preferably 1.5-3:1, be further preferably 1.8-2.2:1.
According to the present invention, in step (4), the second liquid phase (i.e. vanadium wastewater) of step (2) gained is carried out contacting with the 3rd liquid phase of step (3) gained and carries out solid-liquid separation after precipitating, obtain the 4th solid phase and the 4th liquid phase, wherein, be equivalent to carry out precipitation to the 3rd liquid phase using contacting as the second liquid phase of vanadium wastewater with the 3rd liquid phase, obtain precipitation product i.e. the 4th solid phase containing vanadium, and chromium is stayed in the 4th liquid phase, do the utilization not only achieved vanadium wastewater like this, save resource, but also the recovery of vanadium can be carried out better, and being separated of vanadium and chromium.In order to realize above-mentioned purpose better, preferably, before described contact, first described second liquid phase is heated to 60-100 DEG C (being more preferably 80-100 DEG C).After described second liquid phase being heated to the temperature in 60-100 DEG C of (being more preferably 80-100 DEG C) scope, then contact with the 3rd liquid phase, vanadium can be separated out better.
According to the present invention, in step (6), described 4th liquid phase is carried out reducing heavy chromium.Described reduction is sunk chromium and is referred to that in the aqueous solution, the chromium of hexavalent state is reduced into chromic process, the present invention sinks the process of chromium to described reduction and is not particularly limited, S-WAT, sulphur, Sodium Pyrosulfite, oxalic acid, glucose etc. such as can be adopted as reducing substances, and the pH of chromium is sunk in described reduction can for 4.5-9.
By adopting method of the present invention, can obtain the yield of vanadium up to more than 90 % by weight, the yield of chromium is up to more than 93 % by weight.
Below will be described the present invention by embodiment.
In following examples and comparative example,
Vanadium chromium slag is the slag charge of gained after containing the blowing of vanadium chromium hot melt;
The yield of vanadium refers to the per-cent of the weight of v element in the weight of v element in the vanadium product of gained after calcining and vanadium chromium slag;
The yield of chromium refers to the per-cent of the weight of chromium element in the weight of chromium element in the chromium product of gained after calcining and vanadium chromium slag.
Embodiment 1
The present embodiment is for illustration of the method for Separation and Recovery vanadium and chromium from vanadium chromium slag of the present invention.
By 100g vanadium chromium slag (content of v element is 5.95 % by weight, and the content of chromium element is 6.05 % by weight) and 15.9g sodium carbonate in 750 DEG C of roasting 90min; Product after roasting is carried out at 80 DEG C water logging 30min (liquid-solid ratio is 2:1) then to filter, gained filtrate carries out ammonium salt precipitation, obtain pH be 2 vanadium wastewater and containing vanadium precipitation, by containing vanadium precipitation carry out calcining the Vanadium Pentoxide in FLAKES product obtaining 8.5g; By the filter residue (110.3g after above-mentioned filtration, the content of water is 5 % by weight), 8g sodium oxide calcines 2h together with 9.6g sodium hydroxide at 820 DEG C, product after roasting is carried out at 60 DEG C water logging 30min (liquid-solid ratio is 1.8:1) then to filter, gained filtrate is poured in the above-mentioned vanadium wastewater being heated to 80 DEG C and is carried out precipitation filtration, precipitating containing vanadium of gained is carried out calcining the Vanadium Pentoxide in FLAKES obtaining 1.17g, filtrate carrying out reduces heavy chromium, obtains the chromium sesquioxide of 8.3g after calcining.The total recovery of vanadium is 91 % by weight, and the total recovery of chromium is 94 % by weight.
Embodiment 2
The present embodiment is for illustration of the method for Separation and Recovery vanadium and chromium from vanadium chromium slag of the present invention.
By 100g vanadium chromium slag (content of v element is 3 % by weight, and the content of chromium element is 9.8 % by weight) and 30.87g sodium bicarbonate in 780 DEG C of roasting 60min; Product after roasting is carried out at 25 DEG C water logging 60min (liquid-solid ratio is 3:1) then to filter, gained filtrate is hydrolyzed precipitation, obtain pH be 3 vanadium wastewater and containing vanadium precipitation, by containing vanadium precipitation carry out calcining the Vanadium Pentoxide in FLAKES product obtaining 4.82g; By the filter residue (117.8g after above-mentioned filtration, the content of water is 8 % by weight) and 70g sodium carbonate at 920 DEG C, calcine 2h together, product after roasting is carried out at 25 DEG C water logging 15min (liquid-solid ratio is 1.5:1) then to filter, gained filtrate is poured in the above-mentioned vanadium wastewater being heated to 60 DEG C and is carried out precipitation filtration, precipitating containing vanadium of gained is carried out calcining the Vanadium Pentoxide in FLAKES obtaining 0.16g, filtrate carrying out reduces heavy chromium, obtains the chromium sesquioxide of 13.595g after calcining.The total recovery of vanadium is 93 % by weight, and the total recovery of chromium is 97 % by weight.
Embodiment 3
The present embodiment is for illustration of the method for Separation and Recovery vanadium and chromium from vanadium chromium slag of the present invention.
100g vanadium chromium slag (content of v element is 9.4 % by weight, and the content of chromium element is 1.7 % by weight) and 24.43g sodium carbonate are carried out roasting 180min in 550 DEG C; Product after roasting is carried out at 100 DEG C water logging 40min (liquid-solid ratio is 1.2:1) then to filter, gained filtrate carries out ammonium salt precipitation, obtain pH be 3.5 vanadium wastewater and containing vanadium precipitation, by containing vanadium precipitation carry out calcining the Vanadium Pentoxide in FLAKES product obtaining 12.416g; Filter residue (110.4g after above-mentioned filtration, the content of water is 5 % by weight), 3.27g sodium hydroxide calcines 4h together with 8.48g sodium carbonate at 950 DEG C, product after roasting is carried out at 40 DEG C water logging 25min (liquid-solid ratio is 3:1) then to filter, gained filtrate is poured in the above-mentioned vanadium wastewater being heated to 90 DEG C and is carried out precipitation filtration, precipitating containing vanadium of gained is carried out calcining the Vanadium Pentoxide in FLAKES obtaining 2.685g, filtrate carrying out reduces heavy chromium, and calcining obtains the chromium sesquioxide of 2.31g.The total recovery of vanadium is 90.2 % by weight, and the total recovery of chromium is 93.1 % by weight.
Comparative example 1
Method according to embodiment 1, difference is, carry out water logging by the filter residue of first time water logging gained with containing the product after the roasting of sodium material and filter, directly gained filtrate carrying out is reduced heavy chromium, the total recovery of vanadium is 80 % by weight, and the total recovery of chromium is 94 % by weight (vanadium also containing 12 % by weight in the product of chromium).
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1. the method for Separation and Recovery vanadium and chromium from vanadium chromium slag, it is characterized in that, the method comprises:
(1) vanadium chromium slag and first are carried out the first roasting containing sodium material, and solid-liquid separation after the product after the first roasting being carried out water logging, obtain the first solid phase and the first liquid phase;
(2) described first liquid phase is carried out solid-liquid separation after precipitation, obtain second solid phase and second liquid phase;
(3) described first solid phase and second are carried out the second roasting containing sodium material, and solid-liquid separation after the product after the second roasting being carried out water logging, obtain the 3rd solid phase and the 3rd liquid phase;
(4) described second liquid phase carried out contacting with described 3rd liquid phase and carry out solid-liquid separation after precipitating, obtaining the 4th solid phase and the 4th liquid phase;
(5) described second solid phase and the 4th solid phase are carried out calcining vanadium extraction;
(6) the 4th liquid phase is carried out reducing heavy chromium.
2. method according to claim 1, wherein, the condition of described first roasting comprises: temperature is 550-800 DEG C, and the time is 50-180min.
3. method according to claim 1, wherein, the condition of described second roasting comprises: temperature is 820-950 DEG C, and the time is 1-4h.
4. method according to claim 1, wherein, in step (1), in described first of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of V element for 2-10:1.
5. method according to claim 4, wherein, in step (1), in described first of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of V element for 2.5-7:1.
6. method according to claim 1, wherein, in step (3), in described second of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of Cr element for 3-15:1.
7. method according to claim 6, wherein, in step (3), in described second of Na element containing sodium material with in the mol ratio of the described vanadium chromium slag of Cr element for 4-8:1.
8. method according to claim 1, wherein, described first is one or more in sodium carbonate, sodium bicarbonate and sodium hydroxide containing sodium material.
9. method according to claim 8, wherein, described first containing sodium material be sodium carbonate and/or sodium bicarbonate.
10. method according to claim 1, wherein, described second is one or more in sodium oxide, sodium hydroxide, sodium carbonate and sodium bicarbonate containing sodium material.
11. methods according to claim 1, wherein, the pH of described second liquid phase is 1.5-5.5.
12. methods according to claim 11, wherein, the pH of described second liquid phase is 2-5.
13. methods according to claim 1, wherein, in step (4), before described contact, are first heated to 60-100 DEG C by described second liquid phase.
14. methods according to claim 1, wherein, in described vanadium chromium slag, the content of v element is 2-35 % by weight, and the content of chromium element is 1.5-40 % by weight.
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| CN106893877B (en) * | 2017-02-27 | 2018-12-21 | 中南大学 | A method of extracting vanadium chromium from vanadium chromic acid mixed salt solution |
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