CN107586947B - The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium - Google Patents
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium Download PDFInfo
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Abstract
The present invention is one kind using low-grade siliceous shale containing vanadium as raw material, the ore dressing field of metallurgy of synthetical recovery wherein vanadium, aluminium, potassium, silicon valuable component.Its step is using low-grade siliceous shale containing vanadium as raw material, vanadium siliceous shale method for floating desiliconization will first be contained, vanadium concentrate and excessive lime stone, sodium carbonate are roasted in rotary kiln high temperature after evenly mixing, obtain the products such as potassium aluminate, potassium ferrite, metavanadic acid calcium, calcium orthosilicate, carbon dioxide, sintered product is dissolved out in dilute alkaline soln, for dissolution fluid after desiliconization purifies, the carbon dioxide gas that rotary kiln generation is passed through in closed container carries out carburizing reagent, is precipitated Al (OH)3Precipitating, hydrolytic precipitation obtains thick vanadium to dealuminzation solution in acid condition, by thick vanadium alkali soluble solution, ammonium chloride is added and obtains ammonium metavanadate, last solution is rich potassium, rich sodium solution, obtains potash, soda through substep evaporation.The present invention thoroughly solves the problem of environmental pollution that the stockpiling of bone coal leached mud generates.
Description
Technical field
The present invention is one kind using low-grade siliceous shale containing vanadium as raw material, synthetical recovery wherein valuable group of vanadium, aluminium, potassium, silicon
The ore dressing field of metallurgy divided.
Technical background
Siliceous shale containing vanadium, abbreviation bone coal is the exclusive characteristic in China containing vanadium resource.Mainly contain vanadium in siliceous shale containing vanadium
Mineral are muscovite containing vanadium, roscoelite, and gangue mineral mainly has quartz, feldspar, calcite etc..The type navajoite is in China's reserves
Extremely abundant, valuable component is more in ore, such as vanadium, aluminium, potassium etc., comprehensive utilization value with higher and fabulous exploitation
Prospect.The characteristics of ore is that grade containing vanadium is low, and quartz, calcite equal size are higher, at high cost with traditional smelting process vanadium extraction,
Economic benefit is low.
China starts from phase early 1960s to the research of the resource of siliceous shale containing vanadium, starts the seventies that chlorine is widely used
Change roasting-water logging technique and calcification baking-water logging technique vanadium extraction.Wherein chloridising roasting-water logging process flow is simple, production cost
It is low, it is suitable for low calcium bone coal, but roasting process can generate the pernicious gases such as chlorine, hydrogen chloride, it is serious to ecological environmental pollution.
It compares, calcification baking is suitable for high calcium stone coal mine, and process environments pollution is small, and sodium salt is not conducive to leached mud rich in calcium
The synthetical recovery of slag.During calcification baking, vanadium and calcium agent in bone coal generate calcium vanadate, and calcium vanadate can be with acid and alkali reaction
Vanadium is leached afterwards.But calcification baking technique generally takes into consideration only the recycling of vanadium, does not account for time of other metals in bone coal
It receives and utilizes, such as the elements such as silicon, potassium, aluminium, cause the waste of resource.Simultaneously as it does not account for returning for other elements
It receives, when leading to its calcification baking, the quality of CaO used is generally the 6-8% of only ore quality.
Up to the present, it yet there are no the selecting smelting combination technique about vanadium, aluminium, potassium, silicon in synthetical recovery siliceous shale containing vanadium
Relevant report.
Summary of the invention
The object of the present invention is to provide a kind of siliceous vanadium-containing shale selecting smelting combination technique, synthetical recovery vanadium therein, potassium,
The resources such as aluminium, silicon.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；Including following steps
It is rapid:
The preliminary desiliconization of step 1
Siliceous vanadium-containing shale is crushed ore grinding to -200 mesh and accounts for 45%-55% fineness, obtains ore pulp to be selected, treats ore dressing slurry
Flotation is carried out, vanadium concentrate and gangue are obtained；The pH of the ore pulp to be selected is 2-5, and solid-liquid mass ratio is 1 in the ore pulp to be selected:
2.5-1:3.5, when flotation, collecting agent used was cation-collecting agent, and dispersing agent used is selected from calgon, prodan, water
At least one of glass；
Step 2 high calcium basic roasting
The amount of aluminium oxide, silica in one gained vanadium concentrate of measuring process, according to molar ratio, sodium carbonate: in vanadium concentrate
Aluminium oxide=0.7-1.3:1, which matches, takes sodium carbonate；According to according to molar ratio, Ca: silica=1.8-2.1 in ore, with taking stone
Ash and/or lime stone；Vanadium concentrate obtained by the sodium carbonate, lime and/or the lime stone that take and step 1 will be matched after mixing,
850-950 DEG C of progress high-temperature roasting at least 2h, obtains product to be leached；
Step 3 desiliconization again
Product to be leached obtained by step 2 is placed in aqueous slkali and is leached；It obtains leachate and leaches residue；It leaches
When, control extraction temperature is 80-85 DEG C, liquid consolidate that mass ratio is 1:1-3:1, extraction time is more than or equal to 0.5h,
Step 4 carbonization treatment
Leachate obtained by step 3 is placed in container, in confined conditions, blasts carbon dioxide gas, is 1- in air pressure
1.2MPa, temperature are stirred to react at least 2 hours under conditions of being 60-80 DEG C, are stood, and filtering obtains carbonization extraction raffinate and hydroxide
Aluminum precipitation；
Step 5 analyses vanadium
The pH value of adjustment carbonization extraction raffinate is precipitated thick vanadium, filters, obtain thick vanadium and except vanadium extraction raffinate to 2-3；Thick vanadium is through alkali soluble
Afterwards, ammonia radical ion is added, obtains ammonium metavanadate precipitate；Ammonium metavanadate and filtrate is obtained by filtration；
Step 6 separates sodium, potassium
Potash and soda are obtained by filtrate obtained by step 5 and except vanadium extraction raffinate carries out substep evaporation after mixing.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；Institute in step 1
It states cation-collecting agent and is selected from least one of lauryl amine, dodecyl trimethyl ammonium chloride, ether amines.Preferably, the sun
Ion collecting agent is added in the ratio that 50-80g is added in ore per ton.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；Dispersing agent is by every
The ratio that 200-400g is added in ton ore is added.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；In step 1, warp
Desiliconization is scanned in roughing three times twice, obtains vanadium concentrate and gangue.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；In step 2, survey
The amount for measuring aluminium oxide, silica in vanadium concentrate obtained by step 1, according to molar ratio, sodium carbonate: aluminium oxide in vanadium concentrate=
0.7-1.3:1, which matches, takes sodium carbonate；According to molar ratio, Ca: silica=1.8-2.1 in ore, with taking lime stone；It will be with taking
Vanadium concentrate obtained by sodium carbonate, lime stone and step 1 after mixing, in 850-950 DEG C of progress high-temperature roasting 2-3h, obtains
Product and carbon dioxide to be leached；Carbon dioxide is used for step 4.It include potassium aluminate in the product to be leached
(K2O.Al2O3), the products such as potassium ferrite (K2O.Fe2O3), metavanadic acid calcium (CaO.V2O5), calcium orthosilicate (2CaO.SiO2).
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；It, will in step 3
Step 2 gained product to be leached, which is placed in aqueous slkali, to be leached；It obtains leachate and leaches residue；When leaching, control is leached
Temperature is 80-85 DEG C, liquid consolidate mass ratio be 1:1-3:1, extraction time 0.5-1h, the concentration of alkali is 50- in the aqueous slkali
100g/L.Leaching residue is low sodium calcium silicates and/or low sodium orthosilicic acid calcium salt, can be directly used as the raw material of production cement.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；It, will in step 4
Leachate obtained by step 3 is placed in container, in confined conditions, blasts carbon dioxide gas, is 1-1.2MPa, temperature in air pressure
Degree is stirred to react 2-3 hours under conditions of being 60-80 DEG C, is stood, filtering, obtains carbonization extraction raffinate and aluminum hydroxide precipitation, stirring
When, control mixing speed is 200-300r/min.Precipitation of alumina can sell after being dried or for produce aluminium or
It is directly used as catalyst use.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；In step 5, use
The pH value of acid solution adjustment carbonization extraction raffinate is precipitated thick vanadium, filters, obtain thick vanadium and except vanadium extraction raffinate to 2-3；The acid solution is selected from salt
At least one of acid, sulfuric acid, phosphoric acid.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；In step 5, slightly
Vanadium adds ammonium chloride after soda ash solution dissolves, until ammonium chloride concentration is sedimentation time 12-15h after 5wt%-10wt%.
The selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium of the present invention；The rate of recovery of V is big
It is greater than in the rate of recovery point that the rate of recovery that the rate of recovery for being equal to 97%, element silicon is greater than 90%, aluminium element is more than or equal to 94%, potassium
The rate of recovery equal to 92%, sodium is more than or equal to 93%.
Compared with prior art, the features of the present invention and beneficial effect are:
(1) heretofore described ore dressing pretreatment process, the tailing of 50%-70%, makes in the siliceous shale that can dish out
The grade of V2O5 is increased to 1.5%-3% in roasting raw material, greatly reduces calcination process amount, has saved the production of entire technique
Cost.
(2) heretofore described calcification baking process can be incited somebody to action by the way that proper amount of sodium carbonate and excessive lime stone is added
Potassium, sodium, aluminium, vanadium are completely converted into soluble aluminate in siliceous shale concentrate, and extra Ca can be complete with element silicon
Portion is converted into calcium silicates, so that each element is comprehensively utilized in subsequent processing, so that siliceous vanadium-containing shale concentrate resource obtains
To all of without leached mud exclusion；
(3) heretofore described alkali soaking technology, the main mine of leached mud are mutually calcium orthosilicate, realize silico-calcium and sodium,
Potassium, vanadium efficiently separate, so as to solve the problems, such as tailings discharge as cement raw material；
(4) carbon dioxide used in heretofore described carbonisation is generated during calcification baking generates, not only sharp
With thermal energy therein, production cost is reduced, and considerably reduces the discharge amount of roasting process carbon dioxide, is realized
It is discarded to utilize, protect ecological environment；
(5) aluminium element in leachate can be precipitated out first, realize aluminium by heretofore described carbonisation
Recycling；
(6) synthetical recovery potassium therein, sodium are gone back in heretofore described carbonisation, the leaching in addition to realizing vanadium
Resource, to realize the zero-emission of bone coal resource substantially.
(7) Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Now in conjunction with embodiment, the invention will be further described.
Embodiment 1
The raw material siliceous rock containing vanadium in Shaanxi somewhere, color is khaki, and each ingredient predominant amount is V2O5: 0.65%,
SiO2: 68.28%, CaO:1.02%, Al2O3: 18.76%, K2O:1.58%, Na2O:0.08%, MgO:0.65%, TFe:
3.00%.
(1) siliceous vanadium-containing shale is crushed ore grinding to -200 mesh first and accounts for 45% fineness, obtained ore pulp to be selected, treat ore dressing
Slurry carries out scanning desiliconization twice through roughing three times, obtains vanadium concentrate and gangue；Collecting agent lauryl amine and octadecylamine used in flotation
Hybrid collector, the collecting agent are added in the ratio that 55g is added in ore per ton；Flotation used is calgon and fluorine silicon
The mixture of sour sodium；Dispersing agent is added in the ratio that 250g is added in ore per ton.The pH of the ore pulp to be selected is 5.
(2) in one gained vanadium concentrate of measuring process aluminium oxide, silica amount, according to molar ratio, sodium carbonate: vanadium concentrate
Middle aluminium oxide=0.9:1, which matches, takes sodium carbonate；According to molar ratio, Ca: silica=1.8 in ore, with taking lime stone；It will match and take
Sodium carbonate, lime stone and gained vanadium concentrate after mixing, in 920 DEG C of progress high-temperature roasting 2.5h, obtain production to be leached
Object and carbon dioxide.
(3) product to be leached is dissolved out in dilute alkaline soln, when dissolution, diluted alkaline concentration used was 50g/L, dissolution temperature
Degree is 82 DEG C, liquid-solid ratio 3:1, extraction time 0.5h, and calcium orthosilicate product is obtained by filtration in leached mud, can be used as cement raw
Material.
(4) dissolution fluid is passed through carbon dioxide gas (two caused by step (1) after desiliconization purifies in closed container
Carbonoxide is all of coming in) carburizing reagent is carried out, carbon dioxide at this time is that calcification baking process generates, and carbonization was decomposed
The carbon dioxide gas pressure that journey is passed through is 1MPa, reaction time 2h, mixing speed 200r/min, reaction temperature 75
℃。
(5) it is aluminium hydroxide that obtained precipitating is decomposed in carbonization, and leachate adjusts pH to 2.5 with hydrochloric acid, hydrolyzes precipitation
1.5h, filtering obtain thick vanadium and except vanadium extraction raffinate.Thick vanadium blasts ammonia, obtains ammonium metavanadate precipitate after alkali soluble；It is obtained by filtration
Ammonium metavanadate and filtrate；
(6) potash and soda will be obtained except vanadium extraction raffinate and filtrate carry out substep evaporation after mixing obtained by (5).
In the present embodiment, the rate of recovery of V is 98.5%, the rate of recovery of element silicon is 92%, the rate of recovery of aluminium element is
95%, potassium, sodium the rate of recovery be respectively 93%, 97% (when calculating the rate of recovery of sodium, it is contemplated that the dosage of sodium carbonate used).
Embodiment 2
The siliceous rock containing vanadium of raw material Certain District, Hunan, color are grey, and each ingredient predominant amount is V2O5: 0.87%,
SiO2: 67.55%, CaO:0.77%, Al2O3: 15.64%, K2O:1.12%, Na2O:0.15%, MgO:0.54%, TFe:
2.11%.
(1) siliceous vanadium-containing shale is crushed ore grinding to -200 mesh first and accounts for 49% fineness, obtained ore pulp to be selected, treat ore dressing
Slurry carries out scanning desiliconization three times through secondary roughing, obtains vanadium concentrate and gangue；Collecting agent used in flotation is ether amines, the collecting
Agent is added in the ratio that 70g is added in ore per ton；The flotation mixture used for calgon and prodan；Dispersing agent
It is added in the ratio that 400g is added in ore per ton.The pH of the ore pulp to be selected is 5.
(2) in one gained vanadium concentrate of measuring process aluminium oxide, silica amount, according to molar ratio, sodium carbonate: vanadium concentrate
Middle aluminium oxide=1:1, which matches, takes sodium carbonate；According to molar ratio, Ca: silica=2.1 in ore, with taking lime stone；It will be with taking
Sodium carbonate, lime stone and gained vanadium concentrate after mixing, in 900 DEG C of progress high-temperature roasting 2h, obtain product to be leached and
Carbon dioxide.
(3) product to be leached is dissolved out in dilute alkaline soln, when dissolution, diluted alkaline concentration used was 50g/L, dissolution temperature
Degree is 80 DEG C, and liquid-solid ratio 2:1, extraction time 1h, leached mud is as cement raw material.
(4) dissolution fluid is passed through carbon dioxide gas in closed container and carries out carburizing reagent, at this time after desiliconization purifies
Carbon dioxide is that calcification baking process generates, and the carbon dioxide gas pressure that carbonization decomposable process is passed through is 1.2MPa, reaction
Time is 3h, and mixing speed 250r/min, reaction temperature is 80 DEG C.
(5) leachate adjusts pH to 3 with sulfuric acid, hydrolyzes precipitation 1h, and filtering obtains thick vanadium and except vanadium extraction raffinate.Thick vanadium is through alkali
After molten, ammonia is blasted, obtains ammonium metavanadate precipitate；Ammonium metavanadate and filtrate is obtained by filtration；
(6) potash and soda will be obtained except vanadium extraction raffinate and filtrate carry out substep evaporation after mixing obtained by (5).
In the present embodiment, the rate of recovery of V is 97%, the rate of recovery of element silicon is 92%, the rate of recovery of aluminium element is 94%,
Potassium, sodium the rate of recovery be respectively 92%, 93%.
Embodiment 3
The raw material siliceous rock containing vanadium in Sichuan somewhere, color are white, and each ingredient predominant amount is V2O5: 0.98%,
SiO2: 66.75%, CaO:0.34%, Al2O3: 18.53%, K2O:1.33%, Na2O:0.26%, MgO:0.49%, TFe:
1.67%.
(1) siliceous vanadium-containing shale is crushed ore grinding to -200 mesh first and accounts for 55% fineness, obtained ore pulp to be selected, treat ore dressing
Slurry carries out scanning desiliconization three times through secondary roughing, obtains vanadium concentrate and gangue；Collecting agent used in flotation is trimethyl
The mixture of ammonium chloride and lauryl amine, the collecting agent are added in the ratio that 68g is added in ore per ton；Flotation used is fluorine silicon
Sour sodium；Dispersing agent is added in the ratio that 300g is added in ore per ton.The pH of the ore pulp to be selected is 3.
(2) in one gained vanadium concentrate of measuring process aluminium oxide, silica amount, according to molar ratio, sodium carbonate: vanadium concentrate
Middle aluminium oxide=1.3:1, which matches, takes sodium carbonate；According to molar ratio, Ca: silica=2.0 in ore, with taking lime stone；It will match and take
Sodium carbonate, lime stone and gained vanadium concentrate after mixing, in 850 DEG C of progress high-temperature roasting 1.5h, obtain production to be leached
Object and carbon dioxide.
(3) sintered product is dissolved out in dilute alkaline soln, when dissolution, diluted alkaline concentration used was 80g/L, leaching temperature
It is 85 DEG C, liquid-solid ratio 1:1, extraction time 2h, leached mud is as cement raw material.
(4) dissolution fluid is passed through carbon dioxide gas in closed container and carries out carburizing reagent, at this time after desiliconization purifies
Carbon dioxide is that calcification baking process generates, and the carbon dioxide gas pressure that carbonization decomposable process is passed through is 1.5MPa, reaction
Time is 2h, and mixing speed 300r/min, reaction temperature is 65 DEG C.
(5) leachate adjusts pH to 2.5 with hydrochloric acid, hydrolyzes precipitation 1.5h, and filtering obtains thick vanadium and except vanadium extraction raffinate.Thick vanadium
After alkali soluble, ammonia is blasted, obtains ammonium metavanadate precipitate；Ammonium metavanadate and filtrate is obtained by filtration；
(6) potash and soda will be obtained except vanadium extraction raffinate and filtrate carry out substep evaporation after mixing obtained by (5).
In the present embodiment, the rate of recovery of V is 98%, the rate of recovery of element silicon is 92%, the rate of recovery of aluminium element is 94%,
Potassium, sodium the rate of recovery be respectively 92%, 94%.
Comparative example 1
The uniform embodiment 1 of other conditions is consistent, the difference is that: without the flotation of step 1, directly adopt ore matter
The calcium carbonate of amount 8% is roasted.In the comparative example, the rate of recovery of V is only that the rate of recovery of 72%, element silicon is 55%, aluminium
The rate of recovery of element is 40%, the rate of recovery of potassium, sodium is respectively 70%, 84% (when calculating the rate of recovery of sodium, it is contemplated that carbon used
The dosage of sour sodium).
Comparative example 2
The uniform embodiment of other conditions 1 is consistent, the difference is that: according to molar ratio, Ca: silica in ore=
1.5, with taking lime stone.In the comparative example, the rate of recovery of V is only that the rate of recovery of 68%, element silicon is returning for 90%, aluminium element
Yield is 62%, the rate of recovery of potassium, sodium is respectively 72%, 88% (when calculating the rate of recovery of sodium, it is contemplated that the use of sodium carbonate used
Amount).
Claims (9)
1. the selecting smelting combination technique of vanadium, aluminium, potassium, silicon in a kind of synthetical recovery siliceous shale containing vanadium；It is characterized in that；Including following
Step:
The preliminary desiliconization of step 1
The broken ore grinding of vanadium siliceous shale will be contained and account for 45%-55% fineness to -200 mesh, obtain ore pulp to be selected, ore dressing slurry is treated and carry out
Flotation obtains vanadium concentrate and gangue；The pH of the ore pulp to be selected is 2-5, and solid-liquid mass ratio is 1:2.5- in the ore pulp to be selected
1:3.5, when flotation, collecting agent used was cation-collecting agent, and dispersing agent used is selected from calgon, prodan, waterglass
At least one of；
Step 2 high calcium basic roasting
Aluminium oxide in one gained vanadium concentrate of measuring process, silica amount sodium carbonate: aoxidized in vanadium concentrate according to molar ratio
Aluminium=0.7-1.3:1, which matches, takes sodium carbonate；According to molar ratio, Ca: silica=1.8-2.1 in ore, with taking lime and/or stone
Lime stone；Vanadium concentrate obtained by the sodium carbonate, lime and/or the lime stone that take and step 1 will be matched after mixing, at 850-950 DEG C
High-temperature roasting at least 2h is carried out, product to be leached is obtained；
Step 3 desiliconization again
Product to be leached obtained by step 2 is placed in aqueous slkali and is leached；It obtains leachate and leaches residue；When leaching, control
Extraction temperature processed is 80-85 DEG C, liquid consolidate mass ratio be 1:1-3:1, extraction time be more than or equal to 0.5h,
Step 4 carbonization treatment
Leachate obtained by step 3 is placed in container, in confined conditions, blasts carbon dioxide gas, is 1- in air pressure
1.2MPa, temperature are stirred to react at least 2 hours under conditions of being 60-80 DEG C, are stood, and filtering obtains carbonization extraction raffinate and hydroxide
Aluminum precipitation；
Step 5 analyses vanadium
The pH value of adjustment carbonization extraction raffinate is precipitated thick vanadium, filters, obtain thick vanadium and except vanadium extraction raffinate to 2-3；Thick vanadium adds after alkali soluble
Enter ammonium ion, obtains ammonium metavanadate precipitate；Ammonium metavanadate and filtrate is obtained by filtration；
Step 6 separates sodium, potassium
Potash and soda are obtained by filtrate obtained by step 5 and except vanadium extraction raffinate carries out substep evaporation after mixing.
2. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
Be characterized in that: cation-collecting agent described in step 1 is at least one in lauryl amine, dodecyl trimethyl ammonium chloride, ether amines
Kind；The cation-collecting agent is added in the ratio that 50-80g is added in ore per ton.
3. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
Be characterized in that: dispersing agent is added in the ratio that 200-400g is added in ore per ton.
4. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
It is characterized in that: in step 1, through roughing three times, scanning desiliconization twice, obtain vanadium concentrate and gangue.
5. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
It is characterized in that: in step 2, the amount of aluminium oxide, silica in one gained vanadium concentrate of measuring process, according to molar ratio, carbonic acid
Sodium: aluminium oxide=0.7-1.3:1, which matches, in vanadium concentrate takes sodium carbonate；According to molar ratio, Ca: silica=1.8-2.1 in ore,
With taking lime stone；By with the sodium carbonate taken, vanadium concentrate obtained by lime stone and step 1 after mixing, 850-950 DEG C into
Row high-temperature roasting 2-3h obtains product and carbon dioxide to be leached；Carbon dioxide is used for step 4.
6. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
It is characterized in that: in step 3, product to be leached obtained by step 2 being placed in aqueous slkali and is leached；Obtain leachate and leaching
Residue；When leaching, control extraction temperature be 80-85 DEG C, liquid consolidate mass ratio be 1:1-3:1, extraction time 0.5-1h, the alkali
The concentration of alkali is 50-100g/L in solution.
7. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
It is characterized in that: in step 4, leachate obtained by step 3 being placed in container, in confined conditions, blasts carbon dioxide gas,
It is stirred to react 2-3 hours, stands under conditions of air pressure is 1-1.2MPa, temperature is 60-80 DEG C, filtering obtains carbonization extraction raffinate
And aluminum hydroxide precipitation, when stirring, control mixing speed is 200-300r/min.
8. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
Be characterized in that: in step 5, the pH value for adjusting carbonization extraction raffinate with acid solution is precipitated thick vanadium, filters, obtain thick vanadium and except vanadium to 2-3
Extraction raffinate；The acid solution is selected from least one of hydrochloric acid, sulfuric acid, phosphoric acid.
9. according to claim 1 in a kind of synthetical recovery siliceous shale containing vanadium vanadium, aluminium, potassium, silicon selecting smelting combination technique；Its
Be characterized in that: the rate of recovery that the rate of recovery that the rate of recovery of V is more than or equal to 97%, element silicon is greater than 90%, aluminium element is more than or equal to
94%, the rate of recovery that the rate of recovery of potassium is more than or equal to 92%, sodium is more than or equal to 93%.
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