CN106882838B - Method for producing titanium dioxide by using waste acid self-circulation non-blast furnace titanium slag sulfuric acid method - Google Patents
Method for producing titanium dioxide by using waste acid self-circulation non-blast furnace titanium slag sulfuric acid method Download PDFInfo
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Abstract
The invention discloses a method for producing titanium white by a waste acid self-circulation non-blast furnace titanium slag sulfuric acid method, belonging to the technical field of titanium white production. The method takes vanadium-titanium magnetite non-blast furnace smelting titanium slag as a raw material, waste acid produced in the titanium dioxide production process is mixed with the non-blast furnace titanium slag to obtain pre-treated titanium slag containing low iron, aluminum and magnesium, the pre-treated titanium slag is subjected to acidolysis and curing by concentrated sulfuric acid, then the titanium dioxide is produced by the procedures of water immersion, concentration, hydrolysis, roasting and the like, and the waste acid after hydrolysis is returned for recycling. The process is mainly characterized in that titanium white waste acid is adopted to pretreat titanium slag, so that most of aluminum and magnesium impurities in the titanium slag are removed, the influence of the aluminum, magnesium and other impurities in the titanium slag on titanium white production is eliminated, the process purification flow of the ilmenite sulfuric acid process is simplified, and a foundation is laid for producing high-quality titanium white; meanwhile, the direct recycling of the titanium white hydrolysis waste acid is realized, and the environmental problem caused by high-concentration acidic wastewater in the titanium white industry is solved.
Description
Technical field
The invention belongs to titanium white production technical field, it is related to a kind of utilization non-blast furnace titaniferous slag production titanium white and titanium white is useless
The method that sour self-loopa utilizes, and in particular to produce titanium using titanium white waste acid and vanadium titano-magnetite or ferrotitanium concentrated ore direct reduction slag
White method.
Background technique
China's titanium resource very abundant, reserves occupy first of the world, wherein the titanium resource reserves of Panxi Diqu account for the whole nation
90% or more, mainly there are Panzhihua, Baima, Taihe county, the big mining area of red lattice four.But the type of China's titanium ore reserves there are it is congenital not
Foot, mostly total, associated minerals, without single mine, the vanadium titano-magnetite of Panxi Diqu is exactly that world-renowned more metals are raw altogether (companion)
Mine.
Titanium in vanadium titano-magnetite only has 30-40% preservation in ilmenite, remaining titanium preservation is difficult in titanomagnetite
In sorting, enters blast furnace process process with titanomagnetite, titanium-containing blast furnace slag is formed, since the Ti content in titanium-containing blast furnace slag only has
15~25%, and the acid consumpting substances such as aluminium oxide, calcium oxide, magnesia content is high, in addition to a part is for building materials, there is no economy can
Capable Comprehensive Utilization Scheme.The titanium in vanadium titano-magnetite mainly passes through ore dressing recovery section concentrated ilmenite at present, is subsequently used for
Producing Titanium Dioxide, as in vanadium titano-magnetite in the form of ilmenite existing for titanium ratio it is less, and sort difficult, lead to v-ti magnetite
The existing titanium comprehensive recovery of mine is less than 20%.
In order to improve the level of comprehensive utilization of vanadium titano-magnetite, China has carried out attacking for direct reduction of V-Ti magnetite smelting
It closes, develops the gas base directly reducings such as coal-based direct reductions or car-bottom furnace such as rotary hearth furnace, tunnel oven, rotary kiln, multitube shaft furnace
Technology, the material for being reduced directly discharge select isolated reduced iron and novel titanium slag through molten point of electric furnace or mill --- non-blast furnace titanium
Slag, the Novel Titanium slag phase are significantly improved than the titanium grade of the titanium-contained slag of traditional blast furnace process output, titaniferous up to 50% or so, from
And the comprehensive utilization ratio for titanium slag Comprehensive recovering titanium, raising vanadium titano-magnetite provides possibility.
Although direct reduction of V-Ti magnetite can obtain the higher non-blast furnace titaniferous slag of titaniferous, the chemical component of the slag and
Essential mineral composition, with the existing titaniferous materials phase such as ilmenite, traditional acid-dissolved titanium slag or electro-titanium slag, titanium-containing blast furnace slag
Than there is significant difference, physicochemical property is also dramatically different.The Ti content of non-blast furnace titaniferous slag is near or above concentrated ilmenite product
Position is far below traditional acid-dissolved titanium slag though being much higher than titanium-containing blast furnace slag.In terms of impurity content, non-blast furnace titaniferous slag
Iron content is significantly less than ilmenite concentrate, and the content close to acid-dissolved titanium slag, but vanadium, chromium, aluminium, magnesium is concentrated ilmenite and acid-soluble titanium
Even more than ten times or more of several times of slag.
It is less for the research of non-blast furnace titaniferous slag resource utilization, report.CN102627321B discloses a kind of using titanium
The method that the titanium slag that ferriferous oxide is reduced directly prepares titanium dioxide first leaches titanium slag with hydrochloric acid solution, obtains
Leached mud again with sulfuric acid carry out acidolysis, curing, leaching, hydrolysis and etc. production titanium white, although can remove using salt Ore Leaching
Most of aluminium, magnesium addition in titanium slag, but hydrochloric acid leaching process titanium slag will lead to molten together with the impurity such as a large amount of titanium and aluminium, magnesium
It loses out, in addition, hydrochloric acid medium is strong to the corrosivity of equipment, liquid is needed through the processes regenerant salt such as spray roasting after salt Ore Leaching
Acid, it is at high cost.CN101898791B discloses a kind of method for preparing rutile titanium white powder using new technological process titanium slag, by vanadium titanium magnetic
Titanium-contained slag that direct reduction of iron ore obtains and concentrated sulfuric acid direct acidolysis cure, then through leaching, settle and titanium liquid be obtained by filtration, then
Aluminium removal is added into titanium liquid and removes part aluminium, then titanium white is produced through processes such as oxidation, concentration, hydrolysis, since what is used removes
Aluminium agent is potassium sulfate or ammonium sulfate, at high cost, and can generate a large amount of ammonia nitrogen waste water, pollutes environment.
It should be existing using Titanium White Production By Sulfuric Acid Process in conjunction with the research and industrial practice situation of concentrated ilmenite and titania Slag
The preferred embodiment of stage non-blast furnace titaniferous slag resource utilization.But on the one hand in non-blast furnace titaniferous slag containing it is a large amount of easily with sulfuric acid reaction
Impurity (such as MgO, Al2O3And CaO), if directly using concentrated sulfuric acid acidolysis, a large amount of concentrated sulfuric acids are not only consumed, but also due to these impurity
Intense reaction first occurs with sulfuric acid, releases big calorimetric, causes " solidifying " in advance for reactant, it is anti-with sulfuric acid to hamper titanium oxide
The main reaction answered is completed, and causes acidolysis rate low.Another aspect Titanium White Production By Sulfuric Acid Process technique generates a large amount of spent acid, every production
1t titanium white will discharge 8~10t of spent acid, containing 15%~25% sulfuric acid and 10%~15% ferrous sulfate in spent acid, simultaneously
Also contain Al2(SO4)3、MgSO4Equal inorganic salts and TiO2, the spent acid of titanium white factory is except a part of concentrated to sulfuric acid concentration at present
60% or so is outer for using with concentrated sulfuric acid complex acid, remaining major part relies on neutralisation treatment, and waste acid concentration is at high cost, neutralizes expense
Height, a large amount of gypsum tailings that neutralize are difficult to dispose.Although in conclusion direct reduction of V-Ti magnetite can obtain titaniferous amount it is close or
More than the non-blast furnace titaniferous slag of concentrated ilmenite grade, but due to the impure height of titanium slag, especially aluminium, magnesium, vanadium etc., it is raw to influence sulfuric acid process
The continuous and steady operation and titanium white quality of production process, lack the economic treatment or recycle utilization of titanium white waste acid, while scandium,
The associations rare element such as gallium, vanadium fails preferable synthetical recovery.
Summary of the invention
The object of the present invention is to provide a kind of method of the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of spent acid self-loopa, for
In vanadium titano-magnetite development and utilization, existing titanium resource makes a low multiple use, in sulfate process titanium dioxide industry titanium white waste acid be difficult to through
The problems such as synthetical recoveries such as recycling, Producing Titanium Dioxide process vanadium gallium scandium that help are difficult is original with the non-blast furnace titaniferous slag of vanadium titano-magnetite
Material, pre-processes non-blast furnace titaniferous slag using the spent acid of Producing Titanium Dioxide process, obtains containing aluminium, the lower pretreatment titanium slag of magnesium,
Pretreatment titanium slag uses concentrated sulfuric acid acidolysis to cure again, then produces titanium white through processes such as water logging, concentration, hydrolysis, roastings.Using titanium white
Spent acid pre-processes, most of aluminium, the magnesium addition being both stripped of in titanium slag, and the impurity such as aluminium, magnesium are to Producing Titanium Dioxide in elimination titanium slag
It influences, simplifies ilmenite sulfuric acid process purification process, lay a good foundation for production high quality titanium white；Spent acid titanium is utilized simultaneously
In slag by vanadium, scandium, gallium etc. leach, obtain residual acid concentration it is lower containing vanadium, scandium, gallium leachate, in favor of synthetical recovery vanadium,
Scandium, gallium；Furthermore, it can be achieved that the direct circulation of titanium white waste acid utilizes, the high content acid wastewater bring ring of titanium dioxide industry is solved
Border problem.
The purpose of the present invention is what is be achieved through the following technical solutions.A kind of non-blast furnace titaniferous slag sulfuric acid process of spent acid self-loopa
The method for producing titanium white, using non-blast furnace titaniferous slag as raw material, which comprises the following steps:
(1) non-blast furnace titaniferous slag pretreatment: after titanium slag fine grinding obtained by ilmenite or the non-blast furnace process of vanadium titano-magnetite, with one
Pretreatment is mixed in quantitative titanium dioxide hydrolysis spent acid, then filters, and obtains pretreatment titanium slag and solution after pretreatment；
(2) pretreatment titanium slag acidolysis curing: the pretreatment titanium slag that step (1) is obtained is added by sour mine mass ratio 1.3~2
Enter the concentrated sulfuric acid to be uniformly mixed, after acidolysis, curing, obtains solid mixt；
(3) pulp leaches: the solid mixt that step (2) obtains being carried out pulp leaching with suitable quantity of water, then solid-liquid point
From obtaining leached mud and titanium liquid；
(4) conventional sulfuric acid method produces titanium white: titanium liquid that step (3) obtains is concentrated, hydrolyze, be filtered, washed, calcining
Well known sulfate process titanium dioxide production technology produces titanium white, removes iron without freezing and crystallizing, and titanium hydrolysis raffinate is titanium dioxide hydrolysis spent acid,
Titanium dioxide hydrolysis spent acid return step (1) is recycled；
(5) synthetical recovery aluminium, vanadium, scandium and gallium: the solution after pretreatment that step (1) is obtained is therein for synthetical recovery
Aluminium, vanadium, scandium and gallium, the tail washings return step (3) after synthetical recovery use water as pulp leaching.
Further, the non-blast furnace titaniferous slag be using the mixture of vanadium titano-magnetite, concentrated ilmenite or both as raw material,
Reduzate obtained by being reduced directly in the reduction furnace of non-blast furnace using reducing agent is through titanium slag obtained from slag iron separation, preferably
Ground, using vanadium titano-magnetite as raw material.Wherein the reducing agent is one of coal, coke, coal gas, natural gas or a variety of mixing
Object, the reduction furnace are one kind of rotary hearth furnace, continuous tunnel furnace, tube furnace, rotary kiln, shaft furnace, car-bottom furnace or microwave mine furnace.
Further, the slag iron separation of reduzate obtained by the vanadium titano-magnetite or ferrotitanium concentrated ore direct reduction is
Resulting reduzate will be reduced directly to isolate metallic iron using electric furnace high-temperature is molten and obtain non-blast furnace titaniferous slag, or by gained
Reduzate isolates metallic iron and obtains non-blast furnace titaniferous slag through broken, ore dressing physical separation mode；Preferably, gained is restored
Product isolates metallic iron using electric furnace high-temperature is molten, and slag obtains non-blast furnace titaniferous slag through water quenching.
Further, titanium slag fine grinding in step (1) is the ratio that titanium slag is finely ground to 74 μm of (200 mesh) particles below
Example >=90%；Preferably, titanium slag is finely ground to ratio >=90% of 45 μm of (325 mesh) particles below.
In the present invention unless otherwise stated other than, ratio, concentration and percentage are on the basis of quality.
Further, pretreatment is stirred after titanium slag finely ground in step (1) is mixed with a certain amount of titanium white waste acid, it is pre- to locate
The solid-to-liquid ratio (mass volume ratio) of reason is 1:10~1:2kg/L, it is preferable that solid-to-liquid ratio is 1:5~1:3kg/L；Extraction temperature 80
DEG C~160 DEG C, 2~8h of extraction time；The titanium white waste acid is the raffinate that titanium hydrolysis is precipitated after titanium, the sulfuric acid matter in spent acid
Measure concentration be 15%~25%, it is preferable that hydrolysis be precipitated titanium after raffinate be concentrated by evaporation to h 2 so 4 concentration 25%~
For leaching after 35%.
Further, in step (2), the pretreatment titanium slag that step (1) is obtained by filtration is added by sour mine mass ratio 1.3~2
Enter the concentrated sulfuric acid to be uniformly mixed, the moisture content 0%~20% of the pretreatment titanium slag, concentrated sulfuric acid mass concentration >=92%；If pre- place
Titanium slag moisture content > 20% is managed, then is used after needing drying；Preferably, the moisture content 0%~5% of titanium slag, the matter of the concentrated sulfuric acid are pre-processed
Measure concentration >=98%, initial h 2 so 4 concentration >=80% in pretreatment titanium slag and concentrated sulfuric acid mixture.
Further, acidolysis described in step (2), curing, acidolysis temperature are 130 DEG C~200 DEG C, and curing temperature is
170 DEG C~250 DEG C, the curing time is 1h~4h.
Further, synthetical recovery aluminium, vanadium, scandium and gallium in solution after pretreatment described in step (5), using extraction or ion
Exchange adsorption method recycles scandium, gallium, vanadium, recycles aluminium using ammonia-alum or potassium alum method；Preferably, using two (2- ethylhexyl) phosphorus
Sour (trade name DEPHA or P 204) extracting scandium, is then recycled aluminium with ammonium hydroxide or ammonium sulfate precipitation in the form of ammonia-alum, is adjusted
Whole solution ph recycles vanadium to 0.5-2, with D301 resin adsorption, then with 204 extraction and recovery gallium of P.
Further, the tail washings after step (5) synthetical recovery uses after lime neutralization precipitation magnesium return step (3) as pulp
Leaching water.
Further, TiO in the non-blast furnace titaniferous slag2Mass percentage 40~60%, CaO, MgO, Al2O3Matter
Measuring percentage composition is respectively 3~10%, 5~15%, 5~15%.
A kind of method of the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of spent acid self-loopa provided by the present invention, passes through titanium slag
Pretreatment is mixed with titanium white waste acid, it can be by titanium slag 50~80% Al2O3Dissolution removes, while by the remaining sulfuric acid in spent acid
Concentration is reduced to 30~100g/L.
The method of the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of a kind of spent acid self-loopa provided by the present invention, using titanium white
Production process generate spent acid mix pretreatment with non-blast furnace titaniferous slag, by titanium slag most of aluminium and magnesium be leached into solution,
Aluminium, content of magnesium in titanium slag are reduced, had both solved the problems, such as recycling for titanium white waste acid, is also solved because using non-blast furnace titaniferous slag sulfuric acid
Acidolysis material " solidification ", the influence Producing Titanium Dioxide such as magnalium is precipitated in advance, acidolysis fluid viscosity is big in titanium liquid in advance when method produces titanium white
The problem of with quality.
A kind of advantage of the method for the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of spent acid self-loopa provided by the present invention exists
In:
(1) titanium white waste acid is mixed into pretreatment with non-blast furnace titaniferous slag, has both solved the processing of titanium white waste acid and has recycled
Problem, and eliminate non-blast furnace titaniferous slag and influence titanium white continuous production because of aluminum and magnesium content height, while the remnants in recyclable spent acid
Titanium improves the rate of recovery of titanium；
(2) by pre-processing to titanium slag, influence of the harmful elements such as vanadium to titanium white product quality is eliminated, to produce Gao Pin
Matter titanium white is laid a good foundation；
(3) synthetical recovery of titanium, scandium, vanadium, gallium, aluminium in titanium white waste acid and titanium slag is realized.
Detailed description of the invention
Fig. 1 is a kind of original of the method for the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of spent acid self-loopa provided by the present invention
Then flow chart.
Specific embodiment
Further explanation is made to the present invention below in conjunction with attached drawing.
By titanium slag obtained by the non-blast furnace process of vanadium titano-magnetite it is finely ground after, after being mixed with a certain amount of titanium dioxide hydrolysis spent acid
Pretreatment is stirred at a temperature of 80 DEG C~160 DEG C, is then filtered, and pretreatment titanium slag and solution after pretreatment, Al in titanium slag are obtained2O3
Dissolution rate be 50~80%, 30~100g/L of remaining sulfuric acid concentration in solution after pretreatment；By resulting pretreatment titanium slag, by acid
The industrial sulphuric acid that 92% or more concentration is added in mine mass ratio 1.3~2 is uniformly mixed, and after acidolysis, curing, obtains solid-state mixing
Then object is leached with aquation, titanium liquid is obtained by filtration, and titanium liquid is concentrated, hydrolyzes, be filtered, washed, calcines production titanium white, titanium liquid water
Solution raffinate is titanium white waste acid, and titanium white waste acid returns to pretreatment process；Solution after pretreatment is used for synthetical recovery aluminium, vanadium, scandium and gallium.
Method of the invention is further described with nonlimiting examples below, it is of the invention to help to understand
Content and its advantage, and not as limiting the scope of the present invention, protection scope of the present invention is determined by claims.
Titanium slag ingredient in embodiment:
| Ingredient | TiO2 | Fe | CaO | MgO | Al2O3 |
| Content % | 50.08 | 2.34 | 5.33 | 10.06 | 12.15 |
Embodiment 1
74 μm of grain diameter or less 90% titanium slags of accounting are ground into drying first, by solid-to-liquid ratio 1:5kg/L, titanium white waste acid is dense
Degree 25%, the stirring pretreatment 5h at 90 DEG C.The pretreatment slag addition that ore pulp filters pressing after leaching obtains is filled into the concentrated sulfuric acid
Acidolysis reaction is carried out in acidolysis slot, pre-processes slag moisture content 15%, the sour mine ratio of acidolysis process is 1.8, sulfuric acid concentration 98%,
Acidolysis temperature is 180 DEG C.It is cured after acidolysis reaction terminates slurry curing, curing temperature is 200 DEG C, cures soaking time
For 2h.Water is proportionally added into the acidolysis slot after curing after curing and is leached, titanium liquid is finally obtained by filtration.Titanium liquid is concentrated
After be hydrolyzed, obtained filter cake obtains titanium white product after bleaching, salt treatment, calcining, post-processing, can reach YST299-
2010 synthetic rutile trade mark standards.
Embodiment 2
45 μm of grain diameter or less 90% titanium slags of accounting are ground into drying first, by solid-to-liquid ratio 1:5kg/L, titanium white waste acid is dense
Degree 20%, the stirring pretreatment 6h at 95 DEG C.The pretreatment slag obtained after ore pulp filters pressing after leaching addition is filled into the concentrated sulfuric acid
Acidolysis slot in carry out acidolysis reaction, pre-process slag moisture content 10%, the sour mine ratio of acidolysis process is 1.7, and sulfuric acid concentration is
98%, acidolysis temperature is 190 DEG C.It is cured after acidolysis reaction terminates slurry curing, curing temperature is 220 DEG C, and curing is protected
The warm time is 3h.Water is proportionally added into the acidolysis slot after curing after curing and is leached, titanium liquid is finally obtained by filtration.Titanium liquid
It is hydrolyzed after concentrated, obtained filter cake obtains titanium white product after bleaching, salt treatment, calcining, post-processing, can reach
YST299-2010 synthetic rutile trade mark standard.
Embodiment 3
45 μm of grain diameter or less 90% titanium slags of accounting are ground into drying first, by solid-to-liquid ratio 1:5kg/L, titanium white waste acid is dense
Degree 16%, the stirring pretreatment 8h at 85 DEG C.The pretreatment slag obtained after ore pulp filters pressing after leaching addition is filled into the concentrated sulfuric acid
Acidolysis slot in carry out acidolysis reaction, pre-process slag moisture content 18%, the sour mine ratio of acidolysis process is 1.9, and sulfuric acid concentration is
98%, acidolysis temperature is 200 DEG C.It is cured after acidolysis reaction terminates slurry curing, curing temperature is 200 DEG C, and curing is protected
The warm time is 3h.Water is proportionally added into the acidolysis slot after curing after curing and is leached, titanium liquid is finally obtained by filtration.Titanium liquid
It is hydrolyzed after concentrated, obtained filter cake obtains titanium white product after bleaching, salt treatment, calcining, post-processing, can reach
YST299-2010 synthetic rutile trade mark standard.
Embodiment 4
45 μm of grain diameter or less 90% titanium slags of accounting are ground into drying first, by solid-to-liquid ratio 1:3kg/L, titanium white waste acid is dense
It is reduced to concentration 35%, the stirring pretreatment 3h at 100 DEG C.The pretreatment slag obtained after ore pulp filters pressing after leaching addition is filled
Acidolysis reaction is carried out in the acidolysis slot of the concentrated sulfuric acid, pre-processes slag moisture content 18%, and the sour mine ratio of acidolysis process is 1.9, and sulfuric acid is dense
Degree is 98%, and acidolysis temperature is 200 DEG C.It is cured after acidolysis reaction terminates slurry curing, curing temperature is 200 DEG C, ripe
Change soaking time is 3h.Water is proportionally added into the acidolysis slot after curing after curing and is leached, titanium liquid is finally obtained by filtration.
It is hydrolyzed after titanium liquid is concentrated, obtained filter cake obtains titanium white product after bleaching, salt treatment, calcining, post-processing, can reach
YST299-2010 synthetic rutile trade mark standard.
Claims (14)
1. a kind of method of the non-blast furnace titaniferous slag production of titanium dioxide by sulfuric acid method of spent acid self-loopa, special using non-blast furnace titaniferous slag as raw material
Sign is, comprising the following steps:
(1) non-blast furnace titaniferous slag pretreatment: and a certain amount of after titanium slag fine grinding obtained by ilmenite or the non-blast furnace process of vanadium titano-magnetite
Titanium dioxide hydrolysis spent acid pretreatment is mixed, then filter, obtain pretreatment titanium slag and solution after pretreatment；
(2) pretreatment titanium slag acidolysis curing: the pretreatment titanium slag that step (1) is obtained is added dense by sour mine mass ratio 1.3~2
Sulfuric acid is uniformly mixed, and after acidolysis, curing, obtains solid mixt；
(3) pulp leaches: the solid mixt that step (2) obtains being carried out pulp leaching with suitable quantity of water, is then separated by solid-liquid separation
To leached mud and titanium liquid；
(4) conventional sulfuric acid method produces titanium white: titanium liquid that step (3) obtains is concentrated, hydrolyze, be filtered, washed, calcine well known to
Sulfate process titanium dioxide production technology produces titanium white, removes iron without freezing and crystallizing, titanium hydrolysis raffinate is titanium dioxide hydrolysis spent acid, by titanium white
Spent acid return step (1) is hydrolyzed to be recycled；
(5) synthetical recovery aluminium, vanadium, scandium and gallium: the solution after pretreatment that step (1) is obtained for synthetical recovery aluminium therein, vanadium,
Scandium and gallium, recycle scandium, gallium, vanadium using extraction or ion exchange adsorption, recycle aluminium using ammonia-alum or potassium alum method；It integrates back
Tail washings return step (3) after receipts uses water as pulp leaching.
2. the method according to claim 1, wherein the non-blast furnace titaniferous slag is with vanadium titano-magnetite, ferrotianium
The mixture of concentrate or both be raw material, be reduced directly in the reduction furnace of non-blast furnace using reducing agent obtained by reduzate through slag
The titanium slag that iron is isolated；Wherein the reducing agent is one of coal, coke, coal gas, natural gas or a variety of mixtures, institute
State one kind that reduction furnace is rotary hearth furnace, continuous tunnel furnace, tube furnace, rotary kiln, shaft furnace, car-bottom furnace or microwave mine furnace.
3. according to the method described in claim 2, it is characterized in that, the vanadium titano-magnetite or ferrotitanium concentrated ore direct reduction institute
Reduzate slag iron separation, be will be reduced directly resulting reduzate using electric furnace high-temperature it is molten isolate metallic iron and
Obtain non-blast furnace titaniferous slag；Or gained reduzate is isolated into metallic iron through broken, ore dressing physical separation mode and obtains non-height
Furnace titanium slag.
4. according to the method described in claim 3, it is characterized in that, the vanadium titano-magnetite or ferrotitanium concentrated ore direct reduction institute
It obtains reduzate and isolates metallic iron using electric furnace high-temperature is molten, slag obtains non-blast furnace titaniferous slag through water quenching.
5. the method according to claim 1, wherein titanium slag fine grinding described in step (1), is to be finely ground to titanium slag
Ratio >=90% of 74 μm of particles below.
6. according to the method described in claim 5, it is characterized in that, by titanium slag be finely ground to the ratios of 45 μm of particles below >=
90%.
7. the method according to claim 1, wherein titanium slag finely ground in step (1) and a certain amount of titanium white
Stirring pretreatment after spent acid mixing, pretreated solid-to-liquid ratio is 1:10~1:2kg/L, 80 DEG C~160 DEG C of extraction temperature, when leaching
Between 2~8h；H 2 so 4 concentration in the titanium white waste acid is 15%~25%.
8. the method according to the description of claim 7 is characterized in that solid-to-liquid ratio is 1:5~1:3kg/L, by titanium white waste acid through steaming
Hair is used further to pre-process after being concentrated into h 2 so 4 concentration 25%~35%.
9. the method according to claim 1, wherein in step (2), pretreatment that step (1) is obtained by filtration
Titanium slag is added the concentrated sulfuric acid by sour mine mass ratio 1.3~2 and is uniformly mixed, the moisture content 0%~20% of the pretreatment titanium slag；It is dense
H 2 so 4 concentration >=92%；Pre-process initial h 2 so 4 concentration >=80% in titanium slag and concentrated sulfuric acid mixture.
10. according to the method described in claim 9, it is characterized in that, the moisture content 0%~5% of the pretreatment titanium slag, dense sulphur
Sour mass concentration >=98%.
11. the method according to claim 1, wherein acidolysis described in step (2), curing, acidolysis temperature are
130 DEG C~200 DEG C, curing temperature is 170 DEG C~250 DEG C, and the curing time is 1h~4h.
12. the method according to claim 1, wherein then being used using di-(2-ethylhexyl)phosphoric acid extracting scandium
Ammonium hydroxide or ammonium sulfate precipitation recycle aluminium in the form of ammonia-alum, and adjustment solution ph to 0.5~2 is recycled with D301 resin adsorption
Vanadium, then with 204 extraction and recovery gallium of P.
13. the method according to claim 1, wherein in tail washings lime after step (5) synthetical recovery and heavy
Return step (3) uses water as pulp leaching after the magnesium of shallow lake.
14. the method according to claim 1, wherein TiO in non-blast furnace titaniferous slag2Mass percentage be 40~
60%, CaO, MgO, Al2O3Mass percentage be respectively 3~10%, 5~15%, 5~15%.
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