CN102628099B - Method for forming balls by cooling and solidifying mineral powder by using water glass as bonding agent - Google Patents
Method for forming balls by cooling and solidifying mineral powder by using water glass as bonding agent Download PDFInfo
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Abstract
The invention discloses a method for forming balls by cooling and solidifying mineral powder by using water glass as a bonding agent. The method comprises the following steps of: taking a wet powder ore or a wet concentrate of which the water content is over 2 percent as a raw material, adding a strong alkali into the wet powder ore or the wet concentrate, wherein uniformly mixed strong alkali solution is dispersed on the surface of ore grains, and performing modification; and adding the water glass into the modified wet powder ore or wet concentrate, allowing the water glass to be uniformly distributed on the surface of the wet powder ore or the wet concentrate through mixing and grinding, and briquetting and drying the product to obtain the finished products, i.e. the balls. The method has the advantages of simplified process, cost conservation, reduced energy consumption, reduced carbon emission, harmlessness, environment-friendliness and the like.
Description
Technical field
The present invention relates to the preliminary treatment method of a kind of ore or mineral aggregate, relate in particular to the briquetting method of a kind of ore or mineral aggregate.
Background technology
Under current technical qualification, powdered iron ore, manganese ore powder etc. all need be processed through agglomeration before pyrometallurgical smelting.Agglomeration method mainly contains sintering process, pelletizing method and the group's of pressure method.Pelletizing method and the group's of pressure method are divided again agglomerates, hot pressing pelletizing method and cooled agglomerated pellet method.The cooled agglomerated pellet genealogy of law is carried out agglomeration of fine ore under normal temperature or low temperature, therefore have advantage at aspects such as energy consumption, environmental protection, facility investments.The cooled agglomerated pellet agglomeration is different by the moulding mode, mainly comprises pelletizing method take balling disc as molding device and the briquetting method take the pair roller ball press as molding device.Wherein with the briquetting method of pair roller ball press moulding to the adaptability of raw material, wider to the adaptability of cakingagent kind and performance, its shortcoming is that the unit processing power is less, generally is applicable to small-scale production.The cooled agglomerated pellet agglomeration generally all needs to add cakingagent, and the cakingagent kind is different with addition to be had than big difference because using for the normal temperature of finished pellet and high-temperature machinery intensity.Because cold fixed agglomeration product do not pass through pyroprocessing, remain " rawore ", so its metallurgical performance be difficult to be improved significantly with improve.
The metallurgical fine ore cooled agglomerated pellet cakingagents such as powdered iron ore, manganese ore powder, ilmenite powder, through overtesting or obtain industrial application mainly contain ordinary Portland cement, coal-tar pitch, water glass and Sodium salts humic acids.As their each tool advantages of cooled agglomerated pellet cakingagent, but separately deficiency is arranged also.Pelletizing take ordinary Portland cement as preparation of binder contains the CaO height, and breeze does not need drying in the preparation process, and pelletizing normal temperature physical strength is high, and water-fast moisture-resistant is applicable to the smelting of blast furnace, Electric furnace iron and carbon element ferromanganese.But easy explosion during pelletizing high temperature, and not being suitable for rich manganese slag etc., to require slag be acid smelting.Breeze low-temperature concretion pelletizing take coal-tar pitch as preparation of binder is actual to be a kind of carbon-burdened pellet, the interpolation because of cakingagent does not reduce ore grade, breeze does not need drying in the preparation process, pelletizing is except having excellent normal temperature and high-temperature machinery intensity, also has good autoreduction performance, water-fast moisture-resistant can be applicable to the pig iron, carbon element ferromanganese and Fu Meng slag melting simultaneously, especially large blast-furnace smelting.But its preparation process technique is complicated, and environmental protection condition is also not as good as the cold fixed agglomeration method take silicate cement etc. as cakingagent.Fine ore cooled agglomerated pellet take Sodium salts humic acids as preparation of binder also is a kind of carbonaceous pelletizing, also drying not of breeze in the preparation process.But pelletizing high-temperature machinery intensity is lower, and water-fast anti humility performance is also not good enough, is only applicable to electric furnace or small furnace and smelts.The breeze cooled agglomerated pellets such as the powdered iron ore take water glass as preparation of binder, manganese ore powder, have good normal temperature and hot strength, it is less that preparation process is brought impurity into, and intensity can satisfy large blast-furnace smelting requirement, is a kind of in China's usage comparison cooled agglomerated pellet method widely.But because the basic metal of bringing into is many, water-fast anti humility performance is relatively poor, multiplex in electric furnace and Rich Mn slag in furnace smelt, the medium and small blast furnace pig iron smelting, or miningly smelt in electric furnace, blast furnace carbon element ferromanganese smelting and large blase furnace cast iron as joining.
The cooled agglomerated pellet method take water glass as cakingagent of having carried out has: 1) fine ore drying-interpolation water glass-mixing-pressure group-drying; 2) fine ore-interpolation water glass, rosin-mixing-pressure group-drying; 3) fine ore-interpolation water glass, wilkinite or silicon sol-mixing-pressure group-drying; 4) coke powder dehydrates-adds water soluble resin-interpolation water, water glass-mixing-pressure group-drying etc.What these methods had uses in industrial application, and test the overtesting chamber of only carrying out that has.Handled fine ore mainly contains ilmenite concentrate, v-ti magnetite concentrate, powdered iron ore, manganese ore powder, chromite ore fine, coke powder etc.Non-patent literature " the cold solid moulding of the coke powder development of binder modification water glass " (Hu Huiping etc., " chemistry world " 02 phase in 2000, PP 348～351) in record: dry take modified water glass as binding agent to constant weight-the cold solid moulding test of 5mm coke powder, show that the properties-correcting agent Resin A obviously improves the green-ball of Cold Consolidation Molding of Coke Powder pelletizing and dry bulb intensity, and determined its better formula: the mass ratio of water and water glass is 4: 6, and its total consumption is the massfraction that 16%(accounts for dried coke powder); The Resin A consumption is the massfraction that 0.24%(accounts for dried coke powder).Under this better condition, the green-ball of made pelletizing and dry bulb intensity, with almost equal with green-ball and the dry bulb intensity of the made pelletizing of unmodified water glass (wherein the mass ratio of water and water glass is 3: 7, and its total consumption is 16%), but the water tolerance of the former pelletizing and thermotolerance are significantly improved.Non-patent literature " cold solid forming technique and application thereof " (Liu Guogen etc., " mineral products comprehensive utilization " December calendar year 2001, PP 6) relative merits of the cooled agglomerated pellet method take water glass as cakingagent of having touched upon, think that its weak point is that concentrate need be dried to very low moisture content in advance.Chinese patent literature " high Ti cold curing pellet " (number of patent application CN93103638.0, patent application day 1993.04.03, publication number CN1091778A, open day 1994.09.07) claim the present invention to adopt low-temperature concretion technique to replace high-temperature concretion technique, produce high Ti cold curing pellet, use titaniferous amount 33%～40%, granularity-200 order 22%～26%, the titanium fine powder of moisture content below 2% to be raw material, with addition of mineral binder bond water glass 8% or compound binding agent water glass rosin, through batch mixing, high Ti cold curing pellet is produced in pressure ball and cryodrying.As seen, traditional water glass cooled agglomerated pellet technique must be used pulp.Must build specially breeze drying plant and consume fuel for this reason, increase silicate ratio etc.This comes the meeting complicated technology, increases facility investment; Two can increase energy consumption and production cost, also can increase simultaneously the pollution to environment, especially treat high, the suitable moisture content Gao Shigeng of the group of pressure of briquetting breeze water content very.
As everyone knows, the group's of pressure process can be carried out smoothly, except possessing other each conditions, compound must contain suitable moisture content, also claims the suitable group of pressure moisture.The fine ore kind is different, and its suitable group of pressure moisture is different, and variation range is percentum to percent tens, twenties, even higher.If a kind of moisture 15%(butt of wet breeze water content that needs briquetting, together lower), it is 1000Kg that treatment capacity is amounted to pulp, prepare cooled agglomerated pellet take water glass as cakingagent by traditional technology, then at first this wet-milling ore deposit must be dried to very low moisture (being made as 1%), palpus drying and dehydrating 1000 * (15%-1%)=140Kg; Then in the dry powder ore deposit, add water glass.The add-on of water glass need make compound reach suitable pressure group's moisture of this fine ore and must satisfy the requirement of strength of finished pellet simultaneously; The suitable pressure group moisture of establishing again this fine ore is 12%, binding agent glass is moisture 45.8%, in order to reach the suitable group of pressure moisture, then need add 27.99% water glass, and weight is counted Q=279.9Kg.The group of giving birth to that suppresses is moisture to be 12%.Then in Pellets in Drying Process, need again heat dissipation will the group of giving birth in 12% moisture evaporate, the drying and dehydrating amount is counted R=138.2Kg(R=(1000+279.9 * 54.2%) * 12%).Need dehydration 278.2Kg twice dry total.Cakingagent consumption is glutinous large, and energy consumption is high, complex process, and this is to prepare cooled agglomerated pellet technique take water glass as cakingagent by traditional technology to be difficult to promote, and especially presses a major reason that is difficult to use in the group at the large fine ore of wet volume capacity.Therefore, the research raw material need not to be dried to siccative and the cooled agglomerated pellet technique take water glass as cakingagent is significant.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and the method for the breeze cold bound pellet take water glass as binding agent of a kind of work simplification, cost savings, Energy Intensity Reduction, " carbon row " minimizing, environmental protection is provided.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of method of breeze cold bound pellet, the method be take water content in the wet-milling ore deposit more than 2% or wet concentrate as raw material, add highly basic in this wet-milling ore deposit or the wet concentrate and (can add strong base solution or highly basic pressed powder, the adding mode of strong base solution can be manual adding or machinery adds), the strong base solution that (the mixing method can be artificial mixing, stirrer mixing etc.) forms behind the mixing is scattered in the ore particle surface, carries out modification; Then in the wet-milling ore deposit of modification or wet concentrate, adding water glass, make water glass be dispersed in described wet-milling ore deposit or wet concentrate surface through mixed grind, after the group of pressure, drying, make finished pellet again.
Generally speaking, as long as the actual water content of raw material wet-milling ore deposit or wet concentrate is no more than 90% of this fine ore or the suitable group of pressure of concentrate moisture content, the group of pressure of all can directly preparing burden.In the method for above-mentioned breeze cold bound pellet, the water content of described raw material wet-milling ore deposit or wet concentrate can be to treat 50%～90% of the suitable group of pressure of briquetting breeze moisture content.In other words, raw material wet-milling ore deposit of the present invention or wet concentrate need not to dewater in advance, drying, water content is excessively low after drying because of the coke powder also not need in the picture prior art (referring to non-patent literature " the cold solid moulding of coke powder with the development of binder modification water glass "), in order to make compound reach suitable pressure group moisture content, reduce simultaneously the consumption of water glass and commodity water glass is added water and modification, but can directly directly prepare cold bound pellet by processing step of the present invention.
The method of above-mentioned breeze cold bound pellet, described highly basic are preferably added with strong base solution or highly basic pressed powder form.It is higher that the mass percent concentration of described strong base solution is preferably the general concentration of 1%～80%(, and effect is better), its addition is to treat 0.2%～15% of briquetting breeze butt quality.The addition of described highly basic pressed powder is preferably treats 0.1%～10% of briquetting breeze butt quality.The concentration of strong base solution and addition can be according to the purposes of the water content of wet-milling ore deposit or wet concentrate, kind, pelletizing agglomeration product different and respective change.Described highly basic preferably refers to sodium hydroxide, potassium hydroxide or lithium hydroxide.
The method of above-mentioned breeze cold bound pellet, the modulus of described water glass is preferably M=2.2～3.7, and the proportion of described water glass is preferably 1.318～1.599g/cm
3, the degree Beaume of described water glass is preferably 34.98～54.32 ° of B é, and the addition of described water glass is the 1%～23%(more preferably 3%～10% that treats briquetting breeze butt quality).The addition of water glass and mass concentration can be with the purposes differences of moisture, kind and the pelletizing agglomeration product of wet-milling ore deposit or wet concentrate and respective change.
For make compound have the suitable group of pressure moisture, the agglomeration product strength meets service requirements, and reduces cost, can to the properties-correcting agent strong base solution and add water glass concentration adjust and optimize; Namely when higher and its suitable group of the pressure moisture of the wet-milling ore deposit for the treatment of the pelletizing agglomeration or wet concentrate moisture content is low, can improve the concentration (until using the highly basic pressed powder) of properties-correcting agent strong base solution and the concentration of water glass, the suitable pressure that makes compound moisture content reach this fine ore is rolled into a ball moisture; And when lower and its suitable group of the pressure moisture of the wet-milling ore deposit for the treatment of the pelletizing agglomeration or wet concentrate moisture content is higher, then can corresponding reduction properties-correcting agent and the concentration of water glass.
The method of above-mentioned breeze cold bound pellet, the equipment that described mixing is selected is preferably biaxial rneader, post-type mixer, forced stirrer or concrete mixer, and mixing time is preferably 5～25 minutes.
The method of above-mentioned breeze cold bound pellet, the equipment that described mixed grind is selected is preferably wheel roller or damp mill, and the mixed grind time is preferably 2～20 minutes.
The method of above-mentioned breeze cold bound pellet, the equipment that described pressure group selects is preferably twin rollers, oil press, rod-extruding machine or cylinder formula balling press, and the group's of pressure pressure is preferably 30～1000Kg/cm
2
The method of above-mentioned breeze cold bound pellet, described drying are preferably carried out in baking oven, baking bed or conveyor dryer, and drying temperature preferably is controlled at 100 ℃～300 ℃, is preferably 1h～2h time of drying.
Compared with prior art, the invention has the advantages that: the fine ore cooled agglomerated pellet method of the present invention take water glass as cakingagent has the general advantage of common cooled agglomerated pellet technique, because finished pellet has good intensity and high temperature metallurgical properties can be widely used in electric furnace, blast-furnace smelting; The more important thing is, keeping in the suitable situation of finished product pellet strength, wet-milling of the present invention ore deposit does not need special drying, can reduce the consumption of cakingagent water glass, but under the certain situation decrease consumption of cakingagent water glass, this to save cost, reduce energy consumption, reduce cost, expansion cooled agglomerated pellet range of application be significant.From effect, the prepared finished pellet of the present invention can be used for electric furnace, blase furnace cast iron is smelted, rich manganese slag melting, ferroalloy smelting and other require to have high-intensity black, non-ferrous metal pyrometallurgy stove into furnace charge, are applicable to the agglomeration of the nonmetal powders such as the metallurgical breezes such as fine iron ore, manganese ore powder, ilmenite concentrate, v-ti magnetite concentrate, chromite ore fine, non-ferrous metal breeze and coal dust, coke powder.To sum up, adopt pelletizing agglomeration process of the present invention, not only can obviously save cost, reduce energy consumption but also reduce " carbon row ", environmental protection can improve economic benefit and the social benefit of enterprise.
Description of drawings
Fig. 1 is the process flow sheet of the method for cold bound pellet among the embodiment of the invention 1 and the embodiment 2.
Embodiment
The invention will be further described below in conjunction with Figure of description and specific embodiment.
Embodiment 1:
The raw material that present embodiment is selected is a kind of TFe of containing 33.45%, Mn 13.69%, P 0.01%, Zn 1.13%, Pb 0.41%, SiO
23.56%, Al
2O
32.39%, the manganese oxide powder of CaO 8.39%, Ig 6.5%; Its size composition is+35 orders 5.82%, 35～60 orders 20.97%, 60～100 orders 25.51%, 100～150 orders 21.15%, 150～200 orders 13.45% ,-200 orders 13.10%; Its water content is 5.2%(wet basis moisture content), bulk density is 1.35t/m
3
The method of the cold bound pellet of present embodiment manganese oxide powder as shown in Figure 1 may further comprise the steps:
(1) raw material is prepared: with electronic scales take by weighing above-mentioned water content be the water content in wet-milling ore deposit in 5.2% the wet oxidation manganese ore powder 3.165Kg(present embodiment be treat the suitable group of pressure of briquetting breeze moisture content 58%), amount to dry oxidation manganese ore powder 3Kg, prepare simultaneously 3 parts of raw material samples, for subsequent use;
(2) modification: the sodium hydroxide solution (its mass concentration is 33%) that adds respectively 0g, 30g, 60g in above load weighted 3 parts of wet oxidation manganese ore powder, (mixing time is that 5min～10min gets final product) makes sodium hydroxide solution be scattered in the ore particle surface behind the stirrer stirring and evenly mixing, finishes modification;
(3) add cakingagent: the degree Beaume that respectively adds this water glass of liquid glass 180g(of the same race in above 3 parts of raw material samples is 50.2 ° of B é, and modulus M is 2.4, and proportion is 1.53g/cm
3), be to replenish tap water 50ml, respectively mixing in the raw material sample of 0g toward the aqueous sodium hydroxide solution addition wherein;
(4) mixed grind: the admixtion after the above-mentioned steps (3) is entered wheel roller carry out mixed grind, the time is 10min; Make water glass further be scattered in equably wet oxidation manganese ore powder surface, simultaneously to the compound densification;
(5) group's of pressure moulding: each compound after the mixed grind is pressed group's moulding at civilian pair roller briquetting press and with pressing mold at oil press respectively, and the former pelletizing is of a size of 38 * 28 * 21mm pincushion, and latter Φ 25 * 18mm is cylindrical; The group's of pressure pressure is 150Kg/cm
2
(6) drying: in electric drying oven with forced convection the work in-process after the moulding of the group of pressure are given birth to a drying, drying temperature is 100 ℃～300 ℃, and time of drying, 1h made finished pellet after the drying.
Carry out the finished pellet physical strength by industry standard and detect, dropping strength in due order/the M meter, ultimate compression strength is by Kg/ ball, detected result sees Table 1, table 2.The result shows, treating under the condition that the wet breeze water content of briquetting is identical, the group's of pressure moisture is suitable, forming pressure is consistent with the water glass consumption, the pressure group intensity of adding properties-correcting agent is apparently higher than the person that do not add properties-correcting agent, and finished product presses group's intensity properties-correcting agent addition to increase and increase.
Roller press briquetting pelletizing detected result under the different N aOH consumption condition among table 1: the embodiment 1
An oil press pressure group detected result under the different N aOH consumption condition among table 2: the embodiment 1
Embodiment 2:
The raw material that present embodiment is selected is a kind of TFe of containing 33.45%, Mn 13.69%, P 0.01%, Zn 1.13%, Pb 0.41%, SiO
23.56%, Al
2O
32.39%, the manganese oxide powder of CaO 8.39%, Ig 6.5%; Its size composition is+35 orders 5.82%, 35～60 orders 20.97%, 60～100 orders 25.51%, 100～150 orders 21.15%, 150～200 orders 13.45% ,-200 orders 13.10%; Its water content is 5.2%, and bulk density is 1.35t/m
3
The method of the cold bound pellet of present embodiment manganese oxide powder as shown in Figure 1 may further comprise the steps:
(1) raw material is prepared: taking by weighing above-mentioned water content with electronic scales is 5.2% wet oxidation manganese ore powder 3.165Kg, amounts to dry oxidation manganese ore powder 3Kg, prepares simultaneously 2 parts of raw material samples, for subsequent use; Taking by weighing water content with electronic scales again is 1% dry oxidation manganese ore powder 3.03Kg, amounts to dry oxidation manganese ore powder 3Kg, prepares simultaneously 2 parts of raw material samples, for subsequent use;
(2) modification: as properties-correcting agent, respectively take by weighing 20g analytical pure solid sodium hydroxide with electronic scales with aqueous sodium hydroxide solution, and at room temperature it is dissolved in respectively in 30ml, the 46ml tap water, make the aqueous sodium hydroxide solution of different concns; The aqueous sodium hydroxide solution of two kinds of different concns preparing is added to respectively in load weighted two parts of wet oxidation manganese ore powder raw material samples; Then replenish respectively 158ml, 110ml tap water in other two parts of dry powder ore deposit raw material samples of getting ready, (mixing time is that 2min～10min gets final product) makes sodium hydroxide solution be scattered in the ore particle surface behind the stirrer stirring and evenly mixing, finishes modification;
(3) add cakingagent: the degree Beaume that adds respectively liquid glass 150g of the same race, 180g, 240g, this water glass of 240g(in above 4 parts of raw material samples is 50.2 ° of B é, and modulus M is 2.4, and proportion is 1.53g/cm
3), the difference mixing;
(4) mixed grind: the admixtion after the above-mentioned steps (3) is carried out mixed grind with wheel roller, and the time is 10min, makes water glass further be scattered in equably the manganese oxide powder surface, simultaneously to the compound densification;
(5) group's of pressure moulding: each discharging after the mixed grind is pressed group's moulding at civilian pair roller ball press and oil pressure film laminator respectively, and the former pelletizing is of a size of 38 * 28 * 21mm pincushion, and latter Φ 25 * 18mm is cylindrical, the pressure 150Kg/cm of the group of pressure
2
(6) drying: in electric drying oven with forced convection the work in-process after the moulding of the group of pressure are given birth to a drying, drying temperature is 100 ℃～300 ℃, and time of drying, 1h made finished pellet after the drying.
Carry out the finished pellet physical strength by industry standard and detect, dropping strength in due order/the 1M meter, ultimate compression strength is by Kg/ ball, detected result sees Table 3, table 4.The result shows under the condition suitable at the group's of pressure moisture, that forming method is consistent with forming pressure, use not drying and add the properties-correcting agent group of pressure of directly preparing burden of moisture 5.2% wet-milling ore deposit, the physical strength of finished pellet and drying dehydration to moisture 1% and the finished product that improved the fine ore of the same race of silicate ratio press group suitable; Compare the dry powder ore deposit and press group, wet-milling ore deposit interpolation properties-correcting agent pressure group neither needs to carry out the breeze drying and can reduce the water glass dosage again, has clear superiority.
Pressure group detected result (pair roller) among table 3: the embodiment 2 under the various moisture contents condition
Be that cakingagent is pressed group's test-results (pressing mold) with water glass under the table 4 various moisture contents condition
Embodiment 3:
The raw material that present embodiment is selected is a kind of TFe of containing 33.45%, Mn 13.69%, P 0.01%, Zn 1.13%, Pb 0.41%, SiO
23.56%, Al
2O
32.39%, the manganese oxide powder of CaO 8.39%, Ig 6.5%; Its size composition is+35 orders 5.82%, 35～60 orders 20.97%, 60～100 orders 25.51%, 100～150 orders 21.15%, 150～200 orders 13.45% ,-200 orders 13.10%; Its water content is 5.2%(wet basis moisture content), bulk density is 1.35t/m
3
The method of the cold bound pellet of present embodiment manganese oxide powder may further comprise the steps:
(1) raw material is prepared: taking by weighing above-mentioned water content with electronic scales is 5.2% wet oxidation manganese ore powder 3.165Kg, amounts to dry oxidation manganese ore powder 3Kg, prepares simultaneously 3 parts of raw material samples, for subsequent use;
(2) modification: the potassium hydroxide solution (its mass concentration is 33%) that adds respectively 0g, 30g, 60g in above load weighted 3 parts of wet oxidation manganese ore powder, (mixing time is that 2min～10min gets final product) makes potassium hydroxide solution be scattered in the ore particle surface behind the stirrer stirring and evenly mixing, finishes modification;
(3) add cakingagent: the degree Beaume that respectively adds this water glass of liquid glass 180g(of the same race in above 3 parts of raw material samples is 50.2 ° of B é, and modulus M is 2.4, and proportion is 1.53g/cm
3), be to replenish tap water 50ml, respectively mixing in the raw material sample of 0g toward the aqueous sodium hydroxide solution addition wherein;
(4) mixed grind: the admixtion after the above-mentioned steps (3) is entered wheel roller carry out mixed grind, the time is 10min; Make water glass further be scattered in equably wet oxidation manganese ore powder surface, simultaneously to the compound densification;
(5) group's of pressure moulding: each compound after the mixed grind is pressed group's moulding at civilian pair roller briquetting press and with pressing mold at oil press respectively, and the former pelletizing is of a size of 38 * 28 * 21mm pincushion, and latter Φ 25 * 18mm is cylindrical;
(6) drying: in electric drying oven with forced convection the work in-process after the moulding of the group of pressure are given birth to a drying, drying temperature is 100 ℃～300 ℃, and time of drying, 1h made finished pellet after the drying.
Carry out the finished pellet physical strength by industry standard and detect, dropping strength in due order/the M meter, ultimate compression strength is by Kg/ ball, detected result sees Table 5, table 6.The result shows, potassium hydroxide modified effect and sodium hydroxide are basically identical, treating under the condition that the wet ore deposit of briquetting part water content is identical, the group's of pressure moisture is suitable, forming pressure is consistent with the water glass consumption, the pressure group intensity of adding properties-correcting agent is apparently higher than the person that do not add properties-correcting agent, and finished product presses group's intensity properties-correcting agent addition to increase and increase.
Roller press briquetting pelletizing detected result under the different K OH consumption condition among table 5: the embodiment 3
An oil press pressure group detected result under the different K OH consumption condition among table 6: the embodiment 3
Claims (8)
1. the method for the breeze cold bound pellet take water glass as binding agent, it is characterized in that: the method be take water content in the wet-milling ore deposit more than 2% or wet concentrate as raw material, add highly basic in this wet-milling ore deposit or wet concentrate, strong base solution is scattered in the ore particle surface behind the mixing, carries out modification; Then in the wet-milling ore deposit of modification or wet concentrate, adding water glass, make water glass be dispersed in described wet-milling ore deposit or wet concentrate surface through mixed grind, after the group of pressure, drying, make finished pellet again; Described highly basic refers to sodium hydroxide, potassium hydroxide or lithium hydroxide.
2. the method for breeze cold bound pellet according to claim 1 is characterized in that: the water content of described raw material wet-milling ore deposit or wet concentrate is to treat 50%～90% of the suitable group of pressure of briquetting breeze moisture content.
3. the method for breeze cold bound pellet according to claim 1 and 2 is characterized in that: described highly basic is to add with strong base solution or highly basic pressed powder form;
The mass percent concentration of described strong base solution is 1%～80%, and its addition is to treat 0.2%～15% of briquetting breeze butt quality;
The addition of described highly basic pressed powder is to treat 0.1%～10% of briquetting breeze butt quality.
4. the method for breeze cold bound pellet according to claim 1 and 2, it is characterized in that: the modulus of described water glass is 2.2～3.7, proportion 1.318～1.599 g/cm of described water glass
3, the degree Beaume of described water glass is preferably 34.98～54.32 ° of B é, and the addition of described water glass is to treat 1%～23% of briquetting breeze butt quality.
5. the method for breeze cold bound pellet according to claim 1 and 2, it is characterized in that: the equipment that described mixing is selected is biaxial rneader, post-type mixer, forced stirrer or concrete mixer, mixing time is 5～25 minutes.
6. the method for breeze cold bound pellet according to claim 1 and 2, it is characterized in that: the equipment that described mixed grind is selected is wheel roller or damp mill, the mixed grind time is 2～20 minutes.
7. the method for breeze cold bound pellet according to claim 1 and 2 is characterized in that: the equipment that described pressure group selects is twin rollers, oil press, rod-extruding machine or cylinder formula balling press, and the group's of pressure pressure is 30～1000 kg/cm
2
8. the method for breeze cold bound pellet according to claim 1 and 2 is characterized in that: described drying is to carry out in baking oven, baking bed or conveyor dryer, and drying temperature is controlled at 100 ℃～300 ℃, and be 1h～2h time of drying.
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| CN1033195A (en) * | 1988-11-17 | 1989-05-31 | 山西省稷山炼铁厂 | Cold setting pellets of powdered iron concentrate manufacture method and equipment |
| CN1058426A (en) * | 1990-05-04 | 1992-02-05 | 青州水泵厂 | A kind of method of recycling cast silicon iron powder |
| JP3053029B2 (en) * | 1991-10-08 | 2000-06-19 | テルモ株式会社 | Vascular dilatation catheter balloon |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2706142B2 (en) * | 1989-07-19 | 1998-01-28 | 吉川工業株式会社 | Recycling method of steelmaking dusts in electric furnace with scrap preheating furnace |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033195A (en) * | 1988-11-17 | 1989-05-31 | 山西省稷山炼铁厂 | Cold setting pellets of powdered iron concentrate manufacture method and equipment |
| CN1058426A (en) * | 1990-05-04 | 1992-02-05 | 青州水泵厂 | A kind of method of recycling cast silicon iron powder |
| JP3053029B2 (en) * | 1991-10-08 | 2000-06-19 | テルモ株式会社 | Vascular dilatation catheter balloon |
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