CN103290158A - Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal - Google Patents
Method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal Download PDFInfo
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Abstract
The invention discloses a method for realizing dephosphorization of olitic high-phosphorus iron ore by use of biomass charcoal, which realizes direct preparation of low-phosphorus liquid iron by combining direct reduction and high-temperature scrap iron separation. The method comprises the following steps of: preparing high-gasification biomass charcoal; breaking the ore charge; preparing carbon addition-lack carbon-containing pellets; performing direct reduction; and performing high-temperature melting. Compared with the existing method for treating olitic high-phosphorus iron ore, the method disclosed by the invention prepares the carbon addition-lack carbon-containing pellets by taking the widely-available and low-price biomass charcoal as a reducing agent and performs direct reduction in a CO/CO2 mixed atmosphere, and obtains low-carbon residue high-metallization pellets by use of the good gasifying performance of the biomass charcoal under the catalysis of Na2CO3; and the reinforcing effect of Na2O on the dephosphorization of liquid iron is obtained by use of Na2CO3 decomposition in a high-temperature scrap iron separation stage. Since the ash content of the biomass charcoal is low, the slag content in a high-temperature melting process is low. The method disclosed by the invention has the characteristics of high iron recovery rate, good dephosphorization effect and the like.
Description
Technical field
The invention belongs to field of metallurgy, relate to the technology of the dephosphorization of oolitic high phosphorus iron ore, particularly a kind of direct reduction associating high temperature sludge iron separation processes.Belong to ferrous metallurgy-non-blast furnace ironmaking field.
Background technology
China's high-phosphor oolitic hematite reserves are abundant, mainly are distributed in Hunan and Hubei two provinces, and hundred million tons of 30-40 are arranged, account for 1/9 of China's iron ore deposit, the iron grade in this ore deposit is about 50wt%, and the major obstacle that hinders its utilization is exactly that this ore deposit has very high phosphorus content, reaches as high as 1.4wt%.This mineral primary categories is rhombohedral iron ore, rhombspar, clinochlore, quartz and phosphatic rock (fluorine or pyroclasite), and phosphorus mainly exists with phosphatic rock (hydroxyapatite or fluorapatite) form therein; Some is to be filled in the middle of the oolith for this kind phosphatic rock, is to form interbed with rhombohedral iron ore in the form of a ring but considerable part is also arranged, and forms a kind of layered structure of onion shape.Because the thickness of apatite layer and rhombohedral iron ore layer is 2-10 μ m only, there is very big difficulty in the dephosphorization in this ore deposit.How efficiently to utilize such Mineral resources to begin to obtain the attention of domestic a plurality of iron and steel corporation and R﹠D institution.Openly propose at present or deliver following several technological line arranged: (1) wet method dephosphorization; (2) biological phosphate-eliminating; (3) magnetization (or reduction) roasting, coal-based direct reduction+magnetic separation separates (mining metallurgical engineering, 29(2009): 45-50, the mining industry wall bulletin, 465(2008): 27-3, CN201010269488.X, CN201110108641.5, CN201210564122.4 and CN201210294811.2) and (4) melting reduction method dephosphorization (iron and steel, 47(2012): 20-26).Because the production cycle is long, small scale, the reason of cost or environment aspect, the technological line of wet method or biological phosphate-eliminating industrialized feasibility in Iron And Steel Industry is lower.Just seeming has more industrialized advantage and adopt the technological line (directly reduction produce metallized pellet associating high temperature is molten to be divided or magnetic separation separates) of pyrometallurgy.
In the technological line of above employing pyrometallurgy, directly the reductive agent of reduction all adopts coal dust, because the gasification performance of coal dust is relatively poor, carbon must be excessively joined in the carbonaceous pelletizing and just higher degree of metalization can be guaranteed at higher reduction temperature (more than 1250 ℃), therefore general carbon residue content in metallized pellet is higher, cause subsequently molten minute system that the existence of more carbon is arranged, phosphorus will all enter in the metal molten iron in the molten timesharing of high temperature.Its principles of chemistry are shown in reaction (1-2).
(P
2O
5)+5C=2[P]+5CO(g) （1）
(P
2O
5)+5[C]=2[P]+5CO(g) （2）
From our experimental result, adopt the molten operational path that divides of coal-based direct reduction+high temperature, the molten degree of metalization that divides is that phosphorus content in the metallic iron of final gained behind 80% the metallized pellet is 0.7
-1.4wt%, (Chinese rare-earth journal special edition, 26(2008): 676-681), that is to say that phosphorus overwhelming majority in molten branch process enters in the molten iron in the ore deposit.Separate dephosphorization and have following shortcoming for carrying out magnetic separation after the metallized pellet fragmentation: in (1) oolitic high phosphorus iron ore apatite layer and rhombohedral iron ore layer be onion-like structure, must be milled to superfine granularity to metallized pellet and just might make phosphatic rock and metallic iron separate; (2) at high temperature (more than 1250 ℃), there has been the reduction of part phosphorus to enter the metal iron phase mutually from gangue.These factors make the magnetic separation dephosphorization carry the weak effect of iron.
The inventor once proposed to adopt the molten technological line that divides of gas base reduction associating high temperature early stage, owing to there is not the appearance of solid carbon reductive agent in the gas base reduction process, can avoid the reaction (1) or (2) to when high temperature sludge iron separates to the disadvantageous effect of dephosphorization, it is better that the iron effect is put forward in dephosphorization.(Journal of Iron and Steel Research International, 17 (2010): 1-6) still at home because the source of the gas of high-quality reducing gas relatively lacks, its industrialization difficulty is big.
Adopt existing defective in the pyrometallurgy dephosphorization process for overcoming present oolitic high phosphorus iron ore, the inventor proposes to adopt the biomass charcoal of high gasification property as the reductive agent of direct reduction, and carbonaceous pelletizing is at CO
2Directly reduction is compared with coal or coke in/the CO mixed atmosphere, and there is the advantage of the following aspects in biomass charcoal: (1) CO
2Gasification reaction under the condition (3) gasification beginning temperature is low.(Energy﹠amp; Fuels, 23(2009): 94-100) (2) under uniform temp, to the reaction (3), biomass charcoal has better gasification performance; Under the condition of part metals salt catalysis, its gasification rate can further improve.(Biotechnology Advances,27(2009):568–572)。
C+CO
2(g)=2CO(g) （3）
Biomass charcoal, be by the product of high temperature pyrolysis with biomass carbonization under anaerobic environment, it is the extremely abundant reductive agent of a kind of carbon content, characteristics based on above biomass charcoal, under certain reductive condition, adopt the carbonaceous pelletizing of high gasification property wood charcoal powder preparation, can obtain the metallized pellet of low carbon residue, reach the reduction effect similar with the reduction of gas base, low carbon residue metallized pellet further just can be realized the dephosphorization of oolitic high phosphorus iron ore and directly prepare low-phosphorous molten iron by the separation of high temperature sludge iron.
Summary of the invention
The objective of the invention is to: the low-cost method that realizes the oolitic high phosphorus iron ore efficient dephosphorization and reclaim metallic iron is provided.The present invention mainly is at the difficult oolitic high phosphorus iron ore of iron grade greater than 50wt%.The present invention intends adopting the modified biomass charcoal to prepare carbonaceous pelletizing+CO
2/ CO mixed atmosphere directly reduces+technological line that high temperature sludge iron separates, and the reinforcement of biomass charcoal gasification performance is to adopt doping minor N a in wood charcoal powder
2CO
3Method, biomass charcoal base carbonaceous pelletizing is at CO
2Can obtain the metallized pellet of low carbon residue after directly reducing in/CO the mixed atmosphere.The metallized pellet of low carbon residue further carries out can directly obtaining low-phosphorous molten iron after high temperature sludge iron separates again.Owing in the pelletizing Na is arranged
2O(is by the Na that mixes in the wood charcoal powder
2CO
3Decompose and to obtain) existence, the dephosphorization effect of the liquid molten iron of high temperature sludge iron sepn process also can be strengthened simultaneously.
The present invention proposes a kind of method of utilizing biomass charcoal to realize the oolitic high phosphorus iron ore dephosphorization, it is characterized in that, said method comprising the steps of:
Step 1, biomass charcoal is prepared into the biomass charcoal powder; Configuration Na
2CO
3The aqueous solution is with Na
2CO
3The aqueous solution is sprayed at biomass charcoal powder surface, and carries out drying in 120 ℃ air atmosphere, obtains the modified biomass wood charcoal powder;
Step 3, breeze and modified biomass wood charcoal powder are mixed, add CaO, be pressed into pelletizing behind the mixing;
Step 5, with dried pelletizing at CO and CO
2Mix under the reducing atmosphere and reduce;
Preferably, in the step 2, described Na
2CO
3Concentration of aqueous solution is 200g/L, Na during sprinkling
2CO
3The ratio of the aqueous solution and wood charcoal powder is 10-20mL/100g.
Preferably, in the step 2, at the described Na of configuration
2CO
3During the aqueous solution, keep described Na
2CO
3Aqueous temperature is between 40-50 ℃.
Preferably, in the step 3, when breeze and modified biomass wood charcoal powder mix, the mol ratio (m of the oxygen in the ferriferous oxide in fixed carbon and the breeze in the modified biomass wood charcoal powder
C/ m
O) be approximately equal to 0.9.
Preferably, in the step 3, when breeze and modified biomass wood charcoal powder mix, in the modified biomass wood charcoal powder in fixed carbon and the breeze scope of the mol ratio of the oxygen in the ferriferous oxide be 0.85-0.9.
Preferably, in the step 3, behind the interpolation CaO, CaO weight percent and SiO in the described pelletizing
2The ratio (CaOwt%/SiO of weight percent
2Wt%) equal 1.0.。
Preferably, in the step 4, drying temperature is 300 ℃, and be 2-3h time of drying.
Preferably, in the step 5, reduction temperature is 1100-1150 ℃, and the recovery time is 20-25min; In the reducing atmosphere, CO and CO
2Intrinsic standoff ratio P
CO2/ P
COBe 1.0.
Preferably, in the step 6, molten molten minute temperature 1550-1600 ℃ of dividing of high temperature, the molten time 5-10min that divides.
Preferably, fixed carbon content is greater than 75wt% in the described biomass charcoal, and ash content is less than 3wt%; The mean particle size of described biomass charcoal powder is less than 100 μ m; The all iron content of described oolitic high phosphorus iron ore is greater than 50wt%, and phosphorus content is greater than 0.8wt%; Described breeze mean particle size is less than 100 μ m.
The invention has the beneficial effects as follows:
(1) reductive agent that uses of carbonaceous pelletizing utilizes it at Na as wide material sources and cheap biomass charcoal
2CO
3Good gasification performance under the katalysis and under certain directly reductive condition, obtain the pelletizing of the low high degree of metalization of carbon residue.Directly the degree of metalization of reduction gained pelletizing can reach more than 80%, carbon residue content is less than 1.0wt%, reduction back gained pelletizing can directly realize preparing phosphorus content less than the hot low-phosphorous molten iron of 0.4wt% by high temperature molten the branch, and the metallic iron rate of recovery reaches more than 75% simultaneously.
(2) utilized simultaneously yellow soda ash direct reduction phase to the katalysis of biomass charcoal gasification and slag in small amount of N a
2O is molten stage by stage to the strengthening effect of dephosphorization of molten iron at high temperature.
(3) because the ash oontent of biomass charcoal is low, the molten process quantity of slag of dividing of high temperature is few.
(4) equipment of direct reduction can adopt rotary hearth furnace, and molten subset can adopt electric arc furnace, and production unit required for the present invention is maximization production unit ripe in the steel industry, and is with short production cycle, the efficient height.
Description of drawings
Fig. 1 carries the process flow sheet of iron for the present invention utilizes the dephosphorization of biomass charcoal realization oolitic high phosphorus iron ore.
Fig. 2 directly reduces for the present invention and high fractional melting branch gets sample microtexture synoptic diagram, and wherein, Fig. 2 (I) is 1100 ℃ at reduction temperature, and the recovery time is 20min, and reducing atmosphere remains P
CO2/ P
COThe typical microtexture photo of part breeze in the gained metallized pellet under=1.0 the condition; Fig. 2 (II) divides back gained metal-like typical microtexture photo for metallized pellet high temperature is molten.
Embodiment
The method that the present invention carries out the oolitic high phosphorus iron ore dephosphorization is to utilize the biomass charcoal of high carbon content as the carbonaceous pelletizing reductive agent, specifically may further comprise the steps, as shown in Figure 1:
(1) charcoal is carried out modification, the high gasification property of preparation wood charcoal powder: charcoal is through ball milling beading shape wood charcoal powder; Dispose certain density Na
2CO
3The aqueous solution evenly is sprayed at the wood charcoal powder surface according to certain aqueous solution and wood charcoal powder ratio; For guaranteeing Na
2CO
3Be deposited on the wood charcoal powder surface with the ultrafine powder form, wood charcoal powder, is dried to its no obvious moisture content in surface and does not have reunion in the air atmosphere at 120 ℃.
Fixed carbon content is greater than 75wt% in the biomass charcoal that adopts in this step, and ash content is less than 3wt%; Behind broken and ball milling, the granularity of fine-grannular wood charcoal powder is less than 100 μ m.
Na
2CO
3Concentration of aqueous solution is 200g/L, Na during sprinkling
2CO
3The ratio of the aqueous solution and wood charcoal powder is 10-20mL/100g, sprays back Na
2CO
3Doping ratio is 2.0-4.0wt% in wood charcoal powder; At configuration Na
2CO
3During the aqueous solution in order to guarantee Na
2CO
3Fully fast the dissolving, aqueous temperature can be remained between 40-50 ℃.
(2) mineral aggregate fragmentation: getting difficult oolitic high phosphorus iron ore is raw material, with crusher and ball mill it is broken into the fine-grannular breeze, and the breeze granularity is less than 100 μ m.
(3) pelletizing preparation: with the mixed in molar ratio of the wood charcoal powder after breeze and the modification processing according to the oxygen in the ferriferous oxide in fixed carbon and the iron ore in certain wood charcoal powder, add a certain proportion of CaO again, material behind the mixing is pressed into the pelletizing that diameter is 10mm, wherein, ball binding agent processed adopts organic binder bond.
When breeze and innovation wood powdered carbon mix, in the wood charcoal powder in fixed carbon and the breeze ferriferous oxide (be mainly Fe
2O
3) in the mol ratio (m of oxygen
C/ m
O) equal or be approximately equal to 0.9, belong to and owe to join the carbon-containing scope, for example, the scope of this mol ratio is limited between the 0.85-0.9.The addition of CaO meets following condition: weight percent and the SiO of CaO in the pelletizing of preparation
2The ratio (CaOwt%/SiO of weight percent
2Wt%) equal or be approximately equal to 1.0, satisfy namely that molten basicity stage by stage equals or approximate etc. 1.0.
(4) pelletizing drying: in order to guarantee the degree of drying of pelletizing, pelletizing under 300 ℃ of conditions dry 2-3 hour can be reached abundant drying.
(5) directly reduction: the carbonaceous pelletizing for preparing reduces under certain reductive condition.Reduction temperature is 1100-1150 ℃ in this reductive condition, and the recovery time is 20-25min, feeds CO and CO
2Gas mixture, reducing atmosphere keeps P
CO2/ P
COEqual or be approximately equal to 1.0.
In direct reduction process, charcoal participates in reaction (3) and reaction (4) simultaneously:
C+CO
2(g)=2CO(g) （3）
C+Fe
2O
3=Fe+3CO(g) （4）
Wherein, directly reducing early stage, wood charcoal powder is mainly used in the direct reduction of ferriferous oxide in the breeze and constantly reduces, as shown in Equation (4); In the reduction later stage, along with the degree of metalization of iron in the pelletizing improves, ferriferous oxide to the consumption of charcoal seldom, wood charcoal powder is mainly by the CO in the surrounding atmosphere
2Further consume and generation CO, as shown in Equation (3).
When the gasification of reduction later stage charcoal consumes also part stoped reoxidizing of metallic iron in the pelletizing, as shown in Equation (5).Reduce the small portion degree of metalization and further reduce carbon residue in the pelletizing in direct reduction later stage.Reducing latter stage, the wood charcoal powder in the metallized pellet almost all consumes.
Fe+CO
2(g)=FeO+CO(g) (5)
In the metal pelletizing that obtains after reducing, its degree of metalization is more than 80%, and carbon residue content is lower than 1.0wt%.
(6) high temperature is molten divides: the pelletizing that above-mentioned reduction is good, realize that slag iron separates molten the branch in High Temperature Furnaces Heating Apparatus.
In the sepn process of high temperature sludge iron, Na
2CO
3Through decomposing back gained Na
2O has played the effect of strengthening dephosphorization of molten iron, as shown in Equation (6).
3(Na
2O)+(P
2O
5)=2(Na
3P
2O
5) （6）
The molten molten minute condition of dividing of high temperature is molten 1550-1600 ℃ of the temperature of dividing, and the molten time 5-10min that divides has realized that slag iron separates, and directly obtains hot low-phosphorous molten iron and high phosphorus slag.Wherein, the phosphorus content of hot low-phosphorous molten iron is less than 0.4wt%, and the metallic iron rate of recovery is greater than 75%.The phosphorus content of hot molten iron has satisfied converter steelmaking to the requirement of molten iron, can directly enter converter or Electric furnace steel making operation.
Below in conjunction with specific embodiment method of the present invention is described in detail, the chemical ingredients of the used oolitic high phosphorus iron ore powder of the embodiment of the invention is as shown in table 1; The used biomass charcoal composition of the embodiment of the invention is as shown in table 2.
Table 1 oolitic high phosphorus iron ore chemical ingredients (wt%)
The technical analysis (wt%) of the used charcoal of table 2 example
Embodiment 1:
(1) charcoal modification: charcoal 110g is through ball milling, and its mean particle size is less than 100 μ m; Under 40 ℃ of conditions, configuration concentration is the Na of 200g/L
2CO
3The aqueous solution is according to the 10mL/(100g charcoal) ratio evenly be sprayed at the wood charcoal powder surface, wood charcoal powder under 120 ℃, dry 1h in the air atmosphere;
(2) mineral aggregate fragmentation: it is preliminary broken and behind abundant ball milling to get above-mentioned oolitic high phosphorus iron ore 500g, and its mean particle size is less than 100 μ m;
(3) pelletizing preparation: wood charcoal powder and a certain amount of CaO mixing after above-mentioned powdered iron ore and the processing, the CaO add-on satisfies CaOwt%/SiO
2Wt% is 1.0; Material behind the mixing is made the pelletizing that diameter is 10.0mm.Ball binding agent processed adopts the paper waste of 2.0wt%;
(4) pelletizing is at 300 ℃ of dry 2h;
(5) directly reduction: reduce in following condition: adopt well formula constant-temperature oven, reduction temperature is 1100 ℃, and the recovery time is 20min, feeds CO/CO
2Gas mixture 1L/min is P to keep furnace atmosphere
CO2/ P
CO=1.0.
The degree of metalization of the metal pelletizing that obtains after reducing is 85%, and metallized pellet carbon residue content is 0.69wt%;
(6) slag iron separates: will reduce good pelletizing, in the Si-Mo rod High Temperature Furnaces Heating Apparatus molten minute.Molten branch temperature is 1550 ℃, and the molten time 5min that divides realizes the separation of slag iron.
The molten iron phosphorus content of preparation gained is 0.31wt%, metal recovery rate 80%.
Embodiment 2:
(1) charcoal modification: charcoal 110g is through ball milling, and its granularity is less than 100 μ m; Configuration concentration is the Na of 200g/L
2CO
3The aqueous solution (40 ℃ of water temperatures) evenly is sprayed at the wood charcoal powder surface according to the ratio of 20mL/100g charcoal, wood charcoal powder under 120 ℃, in the air atmosphere, dry 1h;
(2) all the other steps are with example 1.
The degree of metalization of reduction gained metallized pellet is 86%, and wherein carbon residue content is 0.52wt%; The final molten iron phosphorus content of molten branch gained is 0.24wt%, metal recovery rate 82%.
Embodiment 3:
Change direct reductive condition (step (3)), all the other steps are with example 1.Direct reductive condition in this example is: adopt well formula constant-temperature oven, reduction temperature is 1100 ℃, and the recovery time is 25min, feeds CO/CO
2Gas mixture 1L/min is P to keep furnace atmosphere
CO2/ P
CO=1.0.
The degree of metalization of the metal pelletizing that obtains after reducing is 80%, and metallized pellet carbon residue content is 0.37wt%; The final molten iron phosphorus content of molten branch gained is 0.20wt%, metal recovery rate 75%.
Embodiment 4:
(1) charcoal modification: the 110g charcoal is through ball milling, and its mean particle size is less than 100 μ m; Configuration concentration is the Na of 200g/L
2CO
3The aqueous solution (40 ℃ of water temperatures) evenly is sprayed at the wood charcoal powder surface according to the ratio of 10mL/ (100g charcoal), wood charcoal powder under 120 ℃, dry 1h in the air atmosphere;
(2) mineral aggregate fragmentation: oolitic high phosphorus iron ore 500g is crushed to below the mean particle size 100 μ m;
(3) pelletizing preparation: the CaO of the wood charcoal powder after powdered iron ore and modification are handled, its add-on satisfies CaOwt%/SiO
2Wt% is 1.0.; Material behind the mixing is made the pelletizing that diameter is 10mm, and ball binding agent processed adopts the paper waste of 2wt%;
(4) pelletizing was 300 ℃ of dryings 2 hours;
(5) directly reduction: carbonaceous pelletizing reduces in following condition: adopt well formula constant-temperature oven, reduction temperature is 1150 ℃, and the recovery time is 20min, feeds CO
2/ CO gas mixture 1L/min is P to keep furnace reduction atmosphere
CO2/ P
CO=1.0.
The degree of metalization of the metal pelletizing that obtains after reducing is 81%, and carbon residue content is 0.80wt%.
(6) slag iron separates: will reduce good pelletizing, in the Si-Mo rod High Temperature Furnaces Heating Apparatus molten minute.Molten branch temperature is 1550 ℃, and the molten time 10min that divides realizes the separation of slag iron.
The molten iron phosphorus content of preparation gained is 0.25wt%, metal recovery rate 76%.
Embodiment 5:
(1) charcoal modification: charcoal is through ball milling, and its mean particle size is less than 100 μ m.Configuration concentration is the Na of 200g/L
2CO
3The aqueous solution evenly is sprayed at the wood charcoal powder surface according to the ratio of 20mL/ (100g charcoal), wood charcoal powder under 120 ℃, dry 1h in the air atmosphere;
(2) other step is with example 4.
The degree of metalization of reduction gained metallized pellet is 82%, and wherein carbon residue content is 0.17wt%; The final molten iron phosphorus content of molten branch gained is 0.18wt%, metal recovery rate 75%.
Embodiment 6:
Change direct reductive condition (step (3)), all the other steps are with example 4.Direct reductive condition in this example is: adopt well formula constant-temperature oven, reduce in following condition: reduction temperature is 1150 ℃, and the recovery time is 25min, feeds CO
2/ CO gas mixture 1L/min is P to keep furnace reduction atmosphere
CO2/ P
CO=1.0.
The degree of metalization of the metal pelletizing that obtains after reducing is 81%, and metallized pellet carbon residue content is 0.11wt%; The final molten iron phosphorus content of molten branch gained is 0.19wt%, metal recovery rate 75%.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.
Claims (10)
1. a method of utilizing biomass charcoal to realize the oolitic high phosphorus iron ore dephosphorization is characterized in that, said method comprising the steps of:
Step 1, biomass charcoal is prepared into the biomass charcoal powder; Configuration Na
2CO
3The aqueous solution is with Na
2CO
3The aqueous solution is sprayed at biomass charcoal powder surface, and carries out drying in 120 ℃ air atmosphere, obtains the modified biomass wood charcoal powder;
Step 2, oolitic high phosphorus iron ore is prepared into breeze;
Step 3, breeze and modified biomass wood charcoal powder are mixed, add CaO, be pressed into pelletizing behind the mixing;
Step 4, with the pelletizing drying;
Step 5, with dried pelletizing at CO and CO
2Mix under the reducing atmosphere and reduce;
Step 6, the pelletizing after will reducing carry out that high temperature is molten to be divided, and realize that slag iron separates.
2. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1 is characterized in that: in the step 2, and described Na
2CO
3Concentration of aqueous solution is 200 g/L, Na during sprinkling
2CO
3The ratio of the aqueous solution and wood charcoal powder is 10-20mL/100g.
3. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1 is characterized in that: in the step 2, at the described Na of configuration
2CO
3During the aqueous solution, keep described Na
2CO
3Aqueous temperature is between 40-50 ℃.
4. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1 is characterized in that: in the step 3, and when breeze and modified biomass wood charcoal powder mix, the mol ratio (m of the oxygen in the ferriferous oxide in fixed carbon and the breeze in the modified biomass wood charcoal powder
C/ m
O) be approximately equal to 0.9.
5. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1, it is characterized in that: in the step 3, when breeze and modified biomass wood charcoal powder mix, in the modified biomass wood charcoal powder in fixed carbon and the breeze scope of the mol ratio of the oxygen in the ferriferous oxide be 0.85-0.90.
6. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1 is characterized in that: in the step 3, add CaO weight percent and SiO in the described pelletizing behind the CaO
2The ratio (CaOwt%/SiO of weight percent
2Wt%) equal 1.0.
7. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1, it is characterized in that: in the step 4, drying temperature is 300 ℃, and be 2-3h time of drying.
8. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1, it is characterized in that: in the step 5, reduction temperature is 1100-1150 ℃, and the recovery time is 20-25 min; In the reducing atmosphere, CO and CO
2Intrinsic standoff ratio P
CO2/ P
COBe 1.0.
9. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1 is characterized in that: in the step 6, and molten molten minute temperature 1550-1600 ℃ of dividing of high temperature, the molten time 5-10 min that divides.
10. the method for oolitic high phosphorus iron ore dephosphorization according to claim 1, it is characterized in that: fixed carbon content is greater than 75wt% in the described biomass charcoal, and ash content is less than 3wt%; The mean particle size of described biomass charcoal powder is less than 100 μ m; The all iron content of described oolitic high phosphorus iron ore is greater than 50wt%, and phosphorus content is greater than 0.8 wt%; Described breeze mean particle size is less than 100 μ m.
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| CN108675297A (en) * | 2018-06-26 | 2018-10-19 | 苏州大学 | A method of preparing cementite using biomass charcoal |
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| CN104451016A (en) * | 2014-11-25 | 2015-03-25 | 北京神雾环境能源科技集团股份有限公司 | Method for separating metal iron from phosphorus containing iron ore |
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| CN105755195A (en) * | 2016-04-12 | 2016-07-13 | 北京科技大学 | Method for directly preparing molten steel from high-silicon iron ores |
| CN105755195B (en) * | 2016-04-12 | 2019-02-05 | 北京科技大学 | A method of molten steel is directly prepared from high-silicon iron ore |
| CN106011358A (en) * | 2016-06-07 | 2016-10-12 | 江苏省冶金设计院有限公司 | Method for treating high-phosphorus ore |
| CN106636520A (en) * | 2016-12-06 | 2017-05-10 | 江苏省冶金设计院有限公司 | System and method for preparing metallized pellet |
| CN107881282A (en) * | 2017-11-15 | 2018-04-06 | 东北大学 | A kind of phosphorus-containing iron ore prereduction synchronization dephosphorization direct ironmaking technique |
| CN108048612A (en) * | 2017-11-28 | 2018-05-18 | 辽宁科技大学 | A kind of utilization regenerative resource reduces iron scale under microwave and prepares high-purity sponge iron process |
| CN108048612B (en) * | 2017-11-28 | 2019-08-20 | 辽宁科技大学 | It is a kind of to restore iron scale under microwave using renewable energy and prepare high-purity sponge iron process |
| CN108675297A (en) * | 2018-06-26 | 2018-10-19 | 苏州大学 | A method of preparing cementite using biomass charcoal |
| CN111621611A (en) * | 2020-06-03 | 2020-09-04 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN111621611B (en) * | 2020-06-03 | 2021-10-15 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
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