CN111763823B - Method for producing sintered cake from complex nickel-containing wet material - Google Patents
Method for producing sintered cake from complex nickel-containing wet material Download PDFInfo
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- CN111763823B CN111763823B CN202010870643.7A CN202010870643A CN111763823B CN 111763823 B CN111763823 B CN 111763823B CN 202010870643 A CN202010870643 A CN 202010870643A CN 111763823 B CN111763823 B CN 111763823B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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Abstract
The invention discloses a method for producing a sintering block by using a complex nickel-containing wet material, which comprises the following steps: preparing materials: mixing the complex nickel-containing wet material with coke powder, cement and iron powder, and then carrying out ageing and mutual infiltration reaction to obtain a premixed ageing ingredient; granulating: feeding the premixed aging ingredients into a granulator for granulation to obtain granular materials with the granularity of 30-50 mm; and (3) sintering: and (3) feeding the particle materials into a sintering furnace for sintering to obtain a sintered block. The method can produce high-strength blocky nickel-containing materials, and creates favorable conditions for improving the production efficiency and reducing the production cost of subsequent smelting and recycling valuable metals.
Description
Technical Field
The invention relates to the technical field of nickel-containing material treatment, in particular to a method for producing sintered cakes by using complex nickel-containing wet materials.
Background
In recent years, large-scale non-ferrous metal smelting enterprises inevitably produce metal tailings containing nickel, copper and the like with low concentration when producing metal products such as high-purity nickel, copper and the like, and the metal tailings are various nickel-containing materials produced by liquid-solid separation measures such as a filter, a filter press, precipitation and the like in a wet smelting process; the material production process has various types, the water concentration levels of the materials are uneven due to different filtering equipment, and the viscosity and other characteristics of the materials produced due to different processes are greatly different, so that the materials cannot be directly buried; therefore, according to the environmental protection requirement and the requirement of enterprise recovery rate, the complex nickel-containing wet material needs to be recovered.
Due to the particularity and difference of the complex nickel-containing wet materials, the complex nickel-containing wet materials become a difficult problem of the prior smelting treatment and recovery process; traditional enterprises select one of the complex nickel-containing wet materials for independent treatment, and can realize the recovery of part of metals through a proper process; and the difficulty of processing the materials mixed together is increased, the processing amount cannot be increased, and the processing benefit of enterprises is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for producing a sintered block from a complex nickel-containing wet material, which can realize the treatment of the complex nickel-containing wet material, improve the capacity and the raw material adaptability of valuable metals recovered by subsequent smelting, reduce the environment-friendly treatment cost and realize a low-cost and high-capacity production mode.
The invention discloses a method for producing a sintered cake from a complex nickel-containing wet material, which comprises the following steps:
preparing materials: mixing a complex nickel-containing wet material with coke powder, cement and iron powder, and then carrying out aging and mutual infiltration reaction to obtain a premixed aged ingredient, wherein the complex nickel-containing wet material comprises a plurality of wet materials with different nickel contents, the wet materials with different nickel contents are compounded according to the principle that the wet material with high nickel content accounts for a large proportion and the wet material with low nickel content accounts for a small proportion, the addition amount of the coke powder is 4-6% of the total weight of the complex nickel-containing wet material, the addition amount of the cement is 6-10% of the total weight of the complex nickel-containing wet material, and the addition amount of the iron powder is 8-12% of the total weight of the complex nickel-containing wet material;
and (3) granulating: feeding the premixed aging ingredients into a granulator for granulation to obtain granular materials with the granularity of 30-50 mm;
and (3) sintering: and feeding the granular materials into a sintering furnace for sintering to obtain a sintered block.
As a further development of the invention, in the dosing step,
the complex nickel-containing wet material comprises a plurality of wet materials with the nickel content of 1-7%, and the nickel content of the complex nickel-containing wet material after batching is 4-6%;
the adding amount of the coke powder is 5% of the total weight of the complex nickel-containing wet material, the adding amount of the cement is 8% of the total weight of the complex nickel-containing wet material, and the adding amount of the iron powder is 10% of the total weight of the complex nickel-containing wet material.
As a further improvement of the invention, the ingredients specifically comprise:
mixing and stirring the complex nickel-containing wet material with coke powder, cement and iron powder, and naturally fermenting to obtain a mixture;
and conveying the mixture into a mixing bin for metering and blanking, and conveying the mixture into a mixing stirrer for mixing, permeating and aging to obtain a premixed aged ingredient.
As a further improvement of the present invention, the granulation specifically comprises:
and (3) feeding the premixed aging ingredients into a disc granulator, continuously and uniformly spraying 5L/min of water onto the premixed aging ingredients, rotating the disc at the rotating speed of 6 circles/min, and continuously and reversely rotating the disc to enable the materials and the edge of the disc to continuously collide, bond, nucleate, grow and form balls so as to obtain the granular materials with the water content of 20-30% and the granularity of 30-50 mm.
As a further improvement of the present invention, the sintering specifically includes:
continuously conveying the materials prepared into granules after the premixing and aging to the upper part of a sintering furnace body according to a capacity plan of 20t/h, pushing the granular materials into a rotary material distributor by a sealing propeller at the top of the furnace, uniformly and orderly distributing the granular materials into a hearth through three-point transmission type material distribution, and sintering the granular materials by the generated heat energy at the middle part of the sintering furnace body at the temperature of 800-;
the bottom of the sintering furnace is blasted, the air flows from bottom to top, the materials are subjected to sintering reaction from top to bottom, moisture and volatile matters of the granular materials are sintered into flue gas, the flue gas enters a flue gas treatment system, the materials are strongly crushed at the bottom of the sintering furnace after being sintered and fall into a discharging hopper, and uniform nickel-containing sinter blocks are produced.
As a further improvement of the invention, the air quantity transmission of the blast air is 300-400m < 3 >/min, and the pressure is 29.6 kPa.
Compared with the prior art, the invention has the beneficial effects that:
1. the nickel-containing sintered block produced by the invention is used as a furnace feeding material for metal smelting recovery, the invention can reduce the moisture, volatile components and other non-metallic elements in the nickel-containing wet material, and the weight of the nickel-containing wet material is reduced by more than 50%; the produced nickel-containing sinter cake is concentrated to about 40 percent, so that the quantity of the subsequent smelting recovery treatment materials is doubled, the metal smelting recovery production capacity is realized, and the energy consumption cost of nonmetal such as water and volatile matters in the smelting process is reduced;
2. compared with the prior art that the nickel-containing spherical and brick-shaped materials with the moisture content of about 25 percent are prepared by the prior treatment process, the moisture content of the nickel-containing sintered blocks produced by the method is reduced to below 3 percent, and the strength of the produced nickel-containing sintered blocks is improved by over 80 percent; meanwhile, the sintered blocks are difficult to break when entering the smelting furnace, the generated soot amount is greatly reduced, the recovery rate of metals such as nickel is realized, and the production benefit of enterprises is improved;
3. the process flow for producing the nickel-containing sintered cake is completely automatically controlled, the operation is simple, the operation that the moisture is reduced by airing for 3-5 days after the existing manual mixing and batching, batching and ball making, block making or brick making is changed, and the current situation that the material quantity is large for storage and standby is reduced; with the improvement of the raw material processing capacity, the number of field post workers is reduced, the post worker operation environment is improved, the labor intensity of the workers is reduced, and the continuous development of modern enterprises is promoted.
Drawings
FIG. 1 is a flow chart of a method for producing agglomerates from a complex nickel-containing wet material according to one embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the attached drawing figures:
as shown in FIG. 1, the present invention provides a method for producing agglomerates from a complex nickel-containing wet material, comprising:
s1, batching: mixing the complex nickel-containing wet material with coke powder, cement and iron powder, and then carrying out aging and mutual infiltration reaction to obtain a premixed aging ingredient;
the method specifically comprises the following steps:
firstly, preliminarily mixing and stirring a plurality of complex nickel-containing wet materials and reagents such as coke powder, cement, iron powder and the like through a forklift according to a mixing proportion, then shoveling raw materials which are naturally fermented, generate heat and evaporate part of water in a mixing process into a proportioning bin, adding the materials in the proportioning bin, automatically metering and blanking, conveying the materials into a double-shaft mixing stirrer for uniform mixing, and simultaneously carrying out aging and mutual permeation reaction on the complex nickel-containing materials and the reagents such as coke powder and the like in the mixing process; stirring, mixing and aging the fully aged nickel-containing material, and continuously entering the next procedure according to the planned yield proportion;
wherein the content of the first and second substances,
the complex nickel-containing wet material comprises a plurality of wet materials with different nickel contents, the complex nickel-containing wet material has larger water content difference and different material viscosities, and contains crystal water; therefore, a plurality of wet materials with different nickel contents are mixed according to the principle that the wet material with high nickel content accounts for a large proportion and the wet material with low nickel content accounts for a small proportion; preferably, the complex nickel-containing wet material comprises a plurality of wet materials with the nickel content of 1-7%, and the nickel content of the complex nickel-containing wet material after batching is 4-6%;
the adding amount of the coke powder is 4-6% of the total weight of the complex nickel-containing wet material, the adding amount of the cement is 6-10% of the total weight of the complex nickel-containing wet material, and the adding amount of the iron powder is 8-12% of the total weight of the complex nickel-containing wet material; preferably, the adding amount of the coke powder is 5% of the total weight of the complex nickel-containing wet material, the adding amount of the cement is 8% of the total weight of the complex nickel-containing wet material, and the adding amount of the iron powder is 10% of the total weight of the complex nickel-containing wet material.
In the burdening process, reagents such as coke powder, cement, iron powder and the like are mixed with wet materials containing nickel to generate self-heating volatile part of water with the cement, the water is contacted with the iron powder to be continuously condensed, and the premixed materials are aged and fermented to create conditions for subsequent sintering and agglomeration.
S2, granulating: feeding the premixed aging ingredients into a granulator for granulation to obtain granular materials with the granularity of 30-50 mm;
the method specifically comprises the following steps:
the method comprises the following steps of conveying premixed aging ingredients to a disc granulator through a belt, slowly rotating the disc reversely at an inclination angle of 60 degrees and materials, blanking the materials at the top of the disc, spraying water at the rear end of a blanking part through a spray pipe at an angle of 5L/min to enable the materials to be contacted with the water and then to be continuously collided and contacted with the edge of the disc, enabling the materials to form round solid particle material groups, gradually agglomerating the material groups into larger particles through the rotation process of the disc, enabling the water content of the prepared materials to be 20-30% (preferably 25%), enabling the granularity of the prepared materials to reach 30-50mm, throwing the prepared spherical particles out of the prepared materials to fall onto the conveying belt along with the increase of the specific gravity and the amount of the material particles, and conveying the prepared granular materials to enter the next process through the belt.
S3, sintering: feeding the granular materials into a sintering furnace for sintering to obtain a sintered block;
the method specifically comprises the following steps:
the spherical materials which are prepared into granules are conveyed to the upper part of a sintering furnace body according to a production plan of 20t/h, the spherical materials are pushed into a rotary material distributor of the furnace body by a sealing propeller at the top of the furnace, the spherical materials are uniformly and orderly distributed into a hearth, the spherical materials are sintered by heat energy generated by combustion of distributed coal powder in the middle of the sintering furnace body in the process of entering the sintering furnace, and the combustion temperature is 800-1000 ℃. Blowing air at the lower part of the sintering furnace, wherein the air quantity is 300-400m3/min, the pressure is 29.6kPa, and the air enables the furnace materials to form a discharging cooling zone, a material agglomeration zone, a high-temperature sintering zone and a preheating drying zone from bottom to top, when the spherulite materials containing certain moisture enter the sintering furnace, the spherulite materials are slowly moved to the high-temperature zone and the agglomeration zone by self weight after being preheated and dried, and finally the spherulite materials reach the discharging cooling zone, are strongly crushed into blocks of about 50mm by large torque assembled at the bottom of the sintering furnace and fall into a discharging hopper, the agglomeration rate is up to 90 percent, so that the energy consumption is reduced for the subsequent smelting, and the smelting energy production and the metal yield are improved; the sintered lump material enters a connecting plate conveyor connected with a chute sealing pipe and is conveyed to a designated storage yard; simultaneously, the bottom air inlet, the middle part is equipped with secondary ventilation system, and the top is discharged flue gas clean system discharge up to standard by the draught fan to the waste gas.
Example (b):
the invention provides a method for producing a sintered block from a complex nickel-containing wet material, which comprises the following steps:
s1, batching:
respectively batching a material containing 1% of nickel, a material containing 3% of nickel, a material containing 5% of nickel and a material containing 7% of nickel according to the proportion of 1:2:2:3 to obtain a complex nickel-containing wet material with the nickel content of 4.75%; then, the complex nickel-containing wet material and reagents such as coke powder, cement, iron powder and the like are respectively proportioned according to the proportion of 5%, 8% and 10% of the total material amount, the materials are evenly mixed and stirred for four times in batches by a forklift, then the materials are shoveled into a proportioning bin, the materials are automatically metered and fed and conveyed into a double-shaft mixing stirrer for mixing, and the nickel-containing materials after mixing and stirring continuously enter a granulating process according to a yield plan of 20 t/h;
s2, granulating:
conveying the premixed materials to a disc granulator through a belt, spraying water according to 5L/min through the rotation of a disc, preparing a round solid particle material mass in the disc, wherein the water content of the prepared particle size is about 25%, and when the particle size of the materials reaches 30-50mm, throwing the prepared spherical particle materials out of the disc granulator and falling onto a conveying belt, and conveying the prepared particle materials into a sintering furnace through the belt for sintering;
s3, sintering: feeding the granular materials into a sintering furnace for sintering to obtain a sintered block;
the granulated spherical materials are conveyed to the upper part of a sintering furnace body according to a production plan of 20t/h, the granulated spherical materials are pushed into a rotary distributing machine of the furnace body from the top of the furnace body to be evenly and orderly distributed into a hearth, the heat energy generated by combustion of the distributed pulverized coal is sintered in the middle of the sintering furnace body, and the combustion temperature is 900 ℃. Blowing air at the lower part of the sintering furnace, conveying the air quantity to 400m & lt 3 & gt/min, conveying the air quantity to 29.6kPa, and conveying the air from bottom to top to enable the furnace burden to form a discharging cooling zone, a material agglomeration zone, a high-temperature sintering zone and a preheating drying zone, after preheating and drying, slowly moving the furnace burden to the high-temperature zone and the agglomeration zone by self weight, finally conveying the furnace burden to the discharging cooling zone, strongly crushing the furnace burden into about 50mm lump materials by large torque assembled at the bottom of the sintering furnace, falling the agglomeration rate of the lump materials into a discharging hopper, and conveying the agglomeration lump materials to a designated storage yard by a connecting plate conveyor connected with a chute sealing pipe. The top of the device discharges the waste gas into a flue gas purification system by a draught fan to reach the standard.
The invention has the advantages that:
1. the nickel-containing sintered block produced by the invention is used as a furnace feeding material for metal smelting recovery, the invention can reduce the moisture, volatile components and other non-metallic elements in the nickel-containing wet material, and the weight of the nickel-containing wet material is reduced by more than 50%; the produced nickel-containing sinter cake is concentrated to about 40 percent, so that the quantity of the subsequent smelting recovery treatment materials is doubled, the metal smelting recovery production capacity is realized, and the energy consumption cost of nonmetal such as water and volatile matters in the smelting process is reduced;
2. compared with the prior art that the nickel-containing spherical and brick-shaped materials with the moisture content of about 25 percent are prepared by the prior treatment process, the moisture content of the nickel-containing sintered blocks produced by the method is reduced to below 3 percent, and the strength of the produced nickel-containing sintered blocks is improved by over 80 percent; meanwhile, the sintered blocks are difficult to break when entering the smelting furnace, the generated soot amount is greatly reduced, the recovery rate of metals such as nickel is realized, and the production benefit of enterprises is improved;
3. the process flow for producing the nickel-containing sintered cake is completely automatically controlled, the operation is simple, the operation that the moisture is reduced by airing for 3-5 days after the existing manual mixing and batching, batching and ball making, block making or brick making is changed, and the current situation that the material quantity is large for storage and standby is reduced; with the improvement of the raw material processing capacity, the number of field post workers is reduced, the post worker operation environment is improved, the labor intensity of the workers is reduced, and the continuous development of modern enterprises is promoted.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for producing agglomerates from complex nickel-containing wet material, comprising:
preparing materials: mixing a complex nickel-containing wet material with coke powder, cement and iron powder, and then carrying out aging and mutual infiltration reaction to obtain a premixed aged ingredient, wherein the complex nickel-containing wet material comprises a plurality of wet materials with different nickel contents, the wet materials with different nickel contents are compounded according to the principle that the wet material with high nickel content accounts for a large proportion and the wet material with low nickel content accounts for a small proportion, the addition amount of the coke powder is 4-6% of the total weight of the complex nickel-containing wet material, the addition amount of the cement is 6-10% of the total weight of the complex nickel-containing wet material, and the addition amount of the iron powder is 8-12% of the total weight of the complex nickel-containing wet material;
and (3) granulating: feeding the premixed aging ingredients into a granulator for granulation to obtain granular materials with the granularity of 30-50 mm;
and (3) sintering: and feeding the granular materials into a sintering furnace for sintering to obtain a sintered block.
2. The method of claim 1, wherein, in the step of compounding,
the complex nickel-containing wet material comprises a plurality of wet materials with the nickel content of 1-7%, and the nickel content of the complex nickel-containing wet material after batching is 4-6%;
the adding amount of the coke powder is 5% of the total weight of the complex nickel-containing wet material, the adding amount of the cement is 8% of the total weight of the complex nickel-containing wet material, and the adding amount of the iron powder is 10% of the total weight of the complex nickel-containing wet material.
3. The method according to any one of claims 1-2, wherein the compounding, in particular comprises:
mixing and stirring the complex nickel-containing wet material with coke powder, cement and iron powder, and naturally fermenting to obtain a mixture;
and conveying the mixture into a mixing bin for metering and blanking, and conveying the mixture into a mixing stirrer for mixing, permeating and aging to obtain a premixed aged ingredient.
4. The method according to claim 1, wherein the granulating comprises:
and (3) feeding the premixed aging ingredients into a disc granulator, continuously and uniformly spraying 5L/min of water onto the premixed aging ingredients, rotating the disc at the rotating speed of 6 circles/min, and continuously and reversely rotating the disc to enable the materials and the edge of the disc to continuously collide, bond, nucleate, grow and form balls so as to obtain the granular materials with the water content of 20-30% and the granularity of 30-50 mm.
5. The method according to claim 1, wherein the sintering, in particular comprises:
continuously conveying the materials prepared into granules after the premixing and aging to the upper part of a sintering furnace body according to a capacity plan of 20t/h, pushing the granular materials into a rotary material distributor by a sealing propeller at the top of the furnace, uniformly and orderly distributing the granular materials into a hearth through three-point transmission type material distribution, and sintering the granular materials by the generated heat energy at the middle part of the sintering furnace body at the temperature of 800-;
the bottom of the sintering furnace is blasted, the air flows from bottom to top, the materials are subjected to sintering reaction from top to bottom, moisture and volatile matters of the granular materials are sintered into flue gas, the flue gas enters a flue gas treatment system, the materials are strongly crushed at the bottom of the sintering furnace after being sintered and fall into a discharging hopper, and uniform nickel-containing sinter blocks are produced.
6. The method as claimed in claim 5, wherein the blowing rate is 300-400m3/min at a pressure of 29.6 kPa.
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| CN1083892C (en) * | 1999-11-29 | 2002-05-01 | 首钢总公司 | Method for producing slag forming agent for steelmaking using convertor sludge as raw material |
| CN1300352C (en) * | 2005-09-16 | 2007-02-14 | 刘沈杰 | Nickel-iron smelting process from nickel oxide ore containing crystal water through blast furnace |
| CN104342556B (en) * | 2013-08-06 | 2017-06-30 | 沈志良 | A kind of method that copper or nickel are extracted from cupric or nickel sludge |
| CN109207718A (en) * | 2018-09-30 | 2019-01-15 | 山西太钢不锈钢股份有限公司 | The method for preparing stainless steel raw material sinter using nickel slag |
| CN110629028A (en) * | 2019-09-27 | 2019-12-31 | 广东金宇环境科技有限公司 | Process for treating sludge containing copper and nickel by combination method |
| CN110760672A (en) * | 2019-09-30 | 2020-02-07 | 浙江特力再生资源有限公司 | Method for producing sintered ore by using industrial solid wastes |
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