CN103667743A - Treatment method of laterite-nickel ore - Google Patents

Treatment method of laterite-nickel ore Download PDF

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Publication number
CN103667743A
CN103667743A CN201310422348.5A CN201310422348A CN103667743A CN 103667743 A CN103667743 A CN 103667743A CN 201310422348 A CN201310422348 A CN 201310422348A CN 103667743 A CN103667743 A CN 103667743A
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China
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nickel ore
red soil
soil nickel
weight parts
carbon black
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CN201310422348.5A
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Chinese (zh)
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CN103667743B (en
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吴道洪
贾岩
曹志成
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北京神雾环境能源科技集团股份有限公司
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Abstract

The invention discloses a treatment method of laterite-nickel ore. The method comprises the following steps: pelleting laterite-nickel ore, a reducer and additives to obtain laterite-nickel ore pellets; carrying out reducing roasting on the laterite-nickel ore pellets in a heat-accumulation rotary hearth furnace to obtain metalized pellets; carrying out crushing and dry magnetic separation on the metalized pellets to obtain nickel iron granules and first tailings; and carrying out wet grinding and wet magnetic separation on the first tailings to obtain nickel iron powder and second tailings, wherein the reducer is carbon black prepared from rubber. The method can be effectively utilized to prepare the nickel iron product.

Description

Red soil nickel ore treatment process
Technical field
The present invention relates to field of metallurgy.Particularly, the present invention relates to red soil nickel ore treatment process.
Background technology
Nickel is a kind of important non-ferrous metal, mainly contains red soil nickel ore and nickel sulfide ore and smelts.At present, the smelting technology rough segmentation of red soil nickel ore is that pyrogenic process, wet method and fiery wet method are in conjunction with three classes.Thermal process has that flow process is short, efficiency advantages of higher, but energy consumption is higher.Lower than pyrogenic process on wet processing cost, but complex treatment process, long flow path, processing condition are high to equipment requirements.Fire wet processing is complicated, long flow path, and its energy consumption is also higher, and environmental pollution is serious.
Therefore, red soil nickel ore treatment process, still haves much room for improvement at present.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art.For this reason, the present invention proposes and can effectively process red soil nickel ore method.
According to embodiments of the invention, the method comprises: red soil nickel ore, reductive agent, additive are made to pelletizing, to obtain red soil nickel ore pelletizing; Described red soil nickel ore pelletizing is carried out to reducing roasting in heat accumulating type rotary hearth furnace, to obtain metallized pellet; Described metallized pellet is carried out to fragmentation and dry type magnetic separation, to obtain ferronickel granule and the first tailings; And described the first tailings is carried out to wet grinding and wet magnetic separation, to obtain ferronickel powder and the second tailings.Wherein, the carbon black of described reductive agent for being prepared by rubber.Thus, utilize according to the red soil nickel ore treatment process of the embodiment of the present invention, can effectively process red soil nickel ore, thereby make ferronickel powder.In addition, waste old has been carried out to reasonable utilization, avoided environmental pollution, at one stroke solve smelting laterite-nickel ores technique and seriously relied on coal, gas resource and coal, the gas resource reserve contradiction between scarcity day by day, and the contradiction between more and more higher environmental requirement and waste old contaminate environment, obtained good comprehensive benefit.
According to embodiments of the invention, above-mentioned red soil nickel ore treatment process can also have following additional technical feature:
According to one embodiment of present invention, described carbon black obtains through the following steps: will be by by rubber pyrolysis 10~90min at 300~900 ℃, to obtain carbon black, combustible gas and tar.Thus, can turn waste into wealth, utilize conventionally discarded reluctant waste old effectively to make carbon black, combustible gas and tar, thereby further can utilize carbon black, combustible gas and tar prepares ferronickel powder effectively.In addition, waste old has been carried out to reasonable utilization, avoided environmental pollution, be conducive to improve comprehensive treating process efficiency.
According to one embodiment of present invention, further comprise that it is 1~4mm that the resulting carbon black of pyrolysis is crushed to granularity.Thus, carbon black can be used as reductive agent, improves the reduction effect of red soil nickel ore, reduces energy expenditure, thereby is conducive to reduce production costs.
According to one embodiment of present invention, the fuel using described combustible gas and tar as reducing roasting.Thus, can solve the problem that traditional technology seriously relies on coal, Sweet natural gas, widen energy sources, thereby be conducive to reduce production costs.
According to one embodiment of present invention, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 3~30 weight parts, the consumption of additive is 0~20 weight part.Thus, can under this proportioning raw materials condition, can expeditiously the ferronickel in this red soil nickel ore be restored, prepare higher-grade ferronickel.
According to one embodiment of present invention, described additive is to be selected from least one of unslaked lime, Wingdale, rhombspar, calcium carbonate, calcium hydroxide, sodium carbonate, sodium sulfate, sodium-chlor, iron protoxide and fluorite.Thus, can further improve the efficiency of comprehensive treating process.
According to one embodiment of present invention, described reducing roasting is at 1400~1600 ℃, to carry out 30~120min.Thus, can effectively red soil nickel ore one step be reduced to ferronickel granule, be conducive to improve the efficiency of reducing roasting red soil nickel ore, thereby can further effectively make ferronickel powder.
According to one embodiment of present invention, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 8 weight parts, and the consumption of additive is 16 weight parts, and described reducing roasting is at 1570 ℃, to carry out 110min.
According to one embodiment of present invention, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 11 weight parts, and the consumption of additive is 11 weight parts, and described reducing roasting is at 1520 ℃, to carry out 70min.
According to one embodiment of present invention, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 30 weight parts, and the consumption of additive is 20 weight parts, and described reducing roasting is at 1470 ℃, to carry out 50min.
According to one embodiment of present invention, described heat accumulating type rotary hearth furnace is provided with at least one heat-storage type burner.Thus, can make fuel burn under oxygen deprivation state, well controlled the reducing atmosphere in rotary hearth furnace, improve reduction efficiency, shortened the recovery time short, be conducive to reduce energy expenditure, lower production cost, meanwhile, owing to having adopted low oxygen combustion, significantly reduced the discharge of carbonic acid gas and oxynitride.In addition, can improve the homogeneity of temperature distribution in rotary hearth furnace burner hearth, be conducive to the carrying out of direct reduction reactor.
According to one embodiment of present invention, the nickel grade of described red soil nickel ore is greater than 0.6 % by weight.Thus, utilize red soil nickel ore treatment process according to an embodiment of the invention, can effectively process this red soil nickel ore, make ferronickel powder.
According to one embodiment of present invention, described the first tailings is carried out to wet grinding and wet magnetic separation further comprises: at least one that adopts wet-type ball mill and rod mill carried out one section or two stage grinding; And adopt magnetic separator to carry out one section or two stages of magnetic separation.Thus, can effectively improve the rate of recovery of nickel, well carry out the separation of slag iron, obtain high-quality ferronickel granule, save molten minute of electric furnace or the molten minute flow process of non-electric furnace in other technique.
According to one embodiment of present invention, further comprise described ferronickel powder is melted minute, to obtain Rhometal.Thus, can obtain high-quality Rhometal.
According to one embodiment of present invention, further comprise described the second tailings for the preparation of building materials.Thus, utilize the second tailings to prepare building materials, turn waste into wealth, both can create economic worth, can prevent tailings contaminate environment again, thereby obtained good comprehensive treating process benefit.
According to one embodiment of present invention, described building materials are to be selected from least one of cast stone, devitrified glass, packing material, gelling material, artificial marine habitat.Thus, can create economic worth, thereby further widen according to the purposes of the prepared product of red soil nickel ore treatment process of the embodiment of the present invention.
Red soil nickel ore treatment process can realize following advantages one of at least according to an embodiment of the invention:
1, red soil nickel ore treatment process according to an embodiment of the invention, can fully utilize waste old and process red soil nickel ore.The carbon black of waste old pyrolysis gained, combustible gas, tar have all obtained utilization, have realized the zero release of recycling and the solid waste of waste old.The carbon black products of waste old pyrolysis is joined to carbon in red soil nickel ore, there is the effect of serving as reductive agent and fuel in rotary hearth furnace Direct Reduction.The combustible gas of waste old pyrolysis and tar products are dried to the fuel of link and rotary hearth furnace direct-reduction link in system, are conducive to reduce production costs;
2, red soil nickel ore treatment process according to an embodiment of the invention, the present invention can adopt rotary hearth furnace Direct Reduction Technology that red soil nickel ore one step is produced to high-quality ferronickel granule or Rhometal.Red soil nickel ore is carried out in rotary hearth furnace, carrying out direct-reduction after pre-treatment, reduction gained metallized pellet is carried out after simple crushing, again just can be fine that ferronickel granule is separated with slag by dry type magnetic separation, obtain high-quality ferronickel granule, molten minute of electric furnace or the molten minute flow process of non-electric furnace in other technique have been saved, reduced cost of investment, energy-conservation efficient again.Also can, according to the character of former red soil nickel ore, select whether again the tailings after dry type magnetic separation to be carried out to the choosing of wet type mill, to improve the rate of recovery of nickel.Red soil nickel ore treatment process according to an embodiment of the invention, technique is simple, and day output is large, thereby is applicable to large-scale batch production;
3, red soil nickel ore treatment process according to an embodiment of the invention, the present invention has adopted regenerative combustion technology, can make full use of combustible gas and tar that waste old pyrolysis produces, realizes a step reduction of red soil nickel ore.Utilizing waste old pyrolysis to obtain carbon black, combustible gas, tar etc. is fuel, and the reduction temperature of rotary hearth furnace can reach 1400~1600 ℃, red soil nickel ore one step can be reduced to ferronickel granule.Regenerative combustion technology can make fuel burn under oxygen deprivation state, has well controlled the reducing atmosphere in rotary hearth furnace, and reduction efficiency is high; recovery time is short; owing to having adopted low oxygen combustion, significantly reduced the discharge of carbonic acid gas and oxynitride, thereby be conducive to environment protection simultaneously.The accurate control of burning of this technology also can improve the temperature distribution evenness in rotary hearth furnace burner hearth, is conducive to the carrying out of direct reduction reactor.In addition, this technology has improved the thermo-efficiency of rotary hearth furnace, can reduce more than 30% by the common rotary hearth furnace of loss-rate;
4, red soil nickel ore treatment process according to an embodiment of the invention, the present invention compares with blast-furnace smelting ferronickel technique with traditional blast furnace, solved energy consumption high, pollute the problems such as large.Compare with rotary kiln-eaf process (RKEF), there is no the misgivings of ring formation of rotary kiln, also without consuming a large amount of expensive electric energy, and the temperature control of rotary hearth furnace is higher, metal is more easily assembled and is grown up, more easily separated with slag, can a direct step produce ferronickel granule;
5, red soil nickel ore treatment process according to an embodiment of the invention, the present invention has obtained good comprehensive benefit.Both can produce high-quality ferronickel, tailings can be used for preparing building materials again, both can create economic worth, be conducive to again environment protection.
6, red soil nickel ore treatment process according to an embodiment of the invention, the present invention widened process red soil nickel ore energy derive, reduced production cost, improved quality product and production efficiency, can solve the problem of environmental pollution that waste old causes, can also realize the solid waste zero release of smelting laterite-nickel ores process, realize cleaner production and Sustainable development, the tailings of final gained is used for preparing building materials, finally realizes the solid waste zero release of whole technical process.
Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is the schematic flow sheet of red soil nickel ore treatment process according to an embodiment of the invention;
Fig. 2 is the schema of red soil nickel ore treatment process according to an embodiment of the invention.
Embodiment
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the present invention, and can not be interpreted as limitation of the present invention.
The present invention proposes a kind of red soil nickel ore treatment process, with reference to accompanying drawing 1, according to embodiments of the invention, red soil nickel ore treatment process can comprise the following steps:
S100: ball processed
According to embodiments of the invention, in this step, red soil nickel ore, carbon black, additive are made to pelletizing, to obtain red soil nickel ore pelletizing.
The smelting technology rough segmentation of traditional red soil nickel ore is pyrogenic process, wet method and fiery wet method are in conjunction with three classes, the present inventor finds, the composition of red soil nickel ore is very complicated, contain numerous impurity elements, calcium for example, magnesium, aluminium, chromium, silicon, sulphur etc., thereby, when utilizing wet method smelting process to process red soil nickel ore, often use number of chemical reagent, and need to carry out multi-step chemical reaction, and these impurity elements also can participate in relevant chemical reaction, thereby the processing to red soil nickel ore causes disadvantageous effect, if directly adopt pyrometallurgical smelting process, the general ore that first will be dried is to remove free-waters all in ore and in conjunction with water, through reducing roasting, process again, then also need to adopt molten minute of electric furnace or the molten minute flow process of non-electric furnace etc., these treating processess all need to consume a large amount of fuel (as coal, electricity, Sweet natural gas etc.), energy consumption is larger, environmental pollution is serious, production cost is higher.Therefore, there is no in fact at present the effective ways that can effectively process red soil nickel ore.The present inventor finds, by method of the present invention, can effectively to red soil nickel ore, process, and makes ferronickel powder or Rhometal.
According to embodiments of the invention, kind and the composition of red soil nickel ore are not particularly limited.For example, according to some embodiments of the present invention, the nickel grade of red soil nickel ore is greater than 0.6 % by weight.Thus, utilize red soil nickel ore treatment process according to an embodiment of the invention, can effectively process this red soil nickel ore, make ferronickel powder or Rhometal.The scope that the present invention can process red soil nickel ore is wide, and the nickel grade of raw ore only need be greater than 0.6%.Even if nickel grade is only 0.67% raw ore, after adopting present method to process, also can produce nickel grade and be 6.88% Rhometal.And the main flow thermal process of processing at present laterite nickel ore and producing ferronickel is only suitable for processing the higher-grade red soil nickel ore that nickel grade is greater than 2%, is not suitable for processing nickel grade and is less than 1.5% red soil nickel ore.
Contriver finds under study for action, compare with directly red soil nickel ore being reduced to process, red soil nickel ore is made to reduce to process after pelletizing be again conducive to improve the reduction efficiency of red soil nickel ore in reduction apparatus, can further improve the effect of reducing roasting red soil nickel ore.
According to embodiments of the invention, player's section processed of red soil nickel ore pelletizing is not particularly limited.For example, according to some embodiments of the present invention, red soil nickel ore, carbon black, additive are made to pelletizing, to obtain red soil nickel ore pelletizing.Thus, carbon black can be used as the reductive agent of red soil nickel ore reduction, and additive can further improve the reduction effect of reducing roasting red soil nickel ore.
According to embodiments of the invention, it is 1~4mm that carbon black is crushed to granularity.Thus, be conducive to further improve the efficiency of reducing roasting red soil nickel ore, reduce energy expenditure, thereby be conducive to reduce production costs.
In addition, adopt roll-type high-pressure ball press or balling disc ball processed, improved working efficiency, be conducive to produce in enormous quantities.
In metallurgical technology field, energy expenditure and energy derive are insoluble problems.Metallurgical process need to consume a large amount of energy, and energy derive is extremely limited again, seriously relies on coal, gas resource, but the savings amount of coal, gas resource but reduces day by day, and cost constantly increases, and has seriously fettered the tempo of metallurgical industry.Yet on the other hand, the processing of various industry and domestic refuse has become the difficult problem that people must face, particularly for the rubber through chemically crosslinked, because its inside has crosslinked network structure, insoluble and difficult degraded, is difficult to process, rubber item has been widely used in each corner in our life, if as dealt with improperly, both caused the wasting of resources after these rubber items are used, can bring severe contamination to environment again.Therefore, how economic, effective, environmental protection ground processing waste old has just become a focal issue that has very much social effect.How the present invention rationally utilizes aspect waste old, particularly, aspect the processing red soil nickel ore using it as energy derive, has obtained creatively progressive.
According to embodiments of the invention, the type of rubber is also not particularly limited, and can be waste old, for example, and junked tire, cable skin, sole material, rubber item scrap stock, tankage etc.
According to embodiments of the invention, can by by waste old at 300~900 ℃ pyrolysis 10~90min to obtain carbon black, combustible gas and tar.Thus, can turn waste into wealth, effectively make carbon black, combustible gas and tar, further can utilize carbon black, combustible gas and tar effectively to prepare ferronickel, thereby widen the source channel of the energy.In addition, waste old has been carried out to reasonable utilization, avoided environmental pollution, obtained good comprehensive treating process benefit.
According to embodiments of the invention, the moiety of red soil nickel ore pelletizing is not particularly limited.For example, according to some embodiments of the present invention, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 3~30 weight parts, the consumption of additive is 0~20 weight part.Thus, under this ratio range condition, can expeditiously the nickel in red soil nickel ore and iron be restored, thereby prepare the ferronickel of different grades.
According to other embodiment of the present invention, additive is to be selected from least one of unslaked lime, Wingdale, rhombspar, calcium carbonate, calcium hydroxide, sodium carbonate, sodium sulfate, sodium-chlor, iron protoxide and fluorite.Thus, can further improve the reduction effect of red soil nickel ore.
S200: reduction
After red soil nickel ore is made to pelletizing, in this step, the pelletizing of preparing in step S1 is joined in reducing apparatus, thereby can make metallized pellet.
In metallurgical technology field, how improving reducing roasting efficiency, save energy consumption and be of crucial importance is also insoluble technical problem.For head it off effectively, the carbon black that the present invention creatively produces waste old pyrolysis, combustible gas, tar etc., as fuel, can reach more than 1400 ℃ the reduction temperature of rotary hearth furnace, red soil nickel ore one step can be reduced to ferronickel granule.According to embodiments of the invention; the present invention has adopted regenerative combustion technology; can make fuel burn under oxygen deprivation state; well controlled the reducing atmosphere in rotary hearth furnace; reduction efficiency is high, and the recovery time is short, and owing to having adopted low oxygen combustion; significantly reduce the discharge of carbonic acid gas and oxynitride, thereby be conducive to environment protection.In addition, the accurate control of the burning of regenerative combustion technology can make the uniformity of temperature profile in rotary hearth furnace thorax, and is conducive to the carrying out of direct reduction reactor and the raising of rotary hearth furnace thermo-efficiency, can reduce more than 30% by the common rotary hearth furnace of loss-rate.
According to embodiments of the invention, the means of reducing roasting are not particularly limited, and can adopt any known device and technique.For example, according to some embodiments of the present invention, heat accumulating type rotary hearth furnace is provided with at least one heat-storage type burner.Thus, be conducive to improve reducing roasting efficiency, reduce energy expenditure, thereby be conducive to reduce production costs.Owing to having adopted this reducing apparatus, be conducive to improve day output in addition, thereby be suitable for industrialized scale operation.
According to embodiments of the invention, the processing parameter of reducing roasting is not particularly limited, and those skilled in the art can be as required, or by testing and determine in advance.For example, according to some embodiments of the present invention, reducing roasting is at 1400~1600 ℃, to carry out 30~120min.Thus, can effectively red soil nickel ore one step be reduced to ferronickel granule, be conducive to improve the efficiency of reducing roasting red soil nickel ore, thereby can further effectively make ferronickel powder or Rhometal.
According to specific embodiment of the present invention, adopt the method for above-mentioned processing red soil nickel ore of the present invention to reduce the condition of roast and can prepare the ferronickel granule of different grades by control the proportioning of red soil nickel ore and reductive agent and additive, control simultaneously.According to concrete example of the present invention, reductive condition can be the red soil nickel ore based on 100 weight parts, and the consumption of carbon black is 8 weight parts, and the consumption of additive is 16 weight parts, and reducing roasting is at 1570 ℃, to carry out 110min.According to another concrete example of the present invention, reductive condition can be the red soil nickel ore based on 100 weight parts, and the consumption of carbon black is 11 weight parts, and the consumption of additive is 11 weight parts, and described reducing roasting is at 1520 ℃, to carry out 70min.According to another concrete example of the present invention, reductive condition can be the red soil nickel ore based on 100 weight parts, and the consumption of carbon black is 30 weight parts, and the consumption of additive is 20 weight parts, and described reducing roasting is at 1470 ℃, to carry out 50min.Pass through in red soil nickel ore reduction process thus, the adjustment of the processing parameters such as the proportioning of reductive agent and additive, rotary hearth furnace reduction temperature and recovery time, control nickel, iron growing up in reduction process, nickel and the easier enrichment of iron particle that makes to be reduced, move and grow up, can obtain the ferronickel granule that granularity is larger, therefore, only need carry out after simple fragmentation reduction gained metallized pellet, again just can be well that ferronickel granule is separated with slag by dry type magnetic separation, obtain the ferronickel granule that nickel grade is 4~35%, nickel recovery can be up to 89.49%.Can significantly improve quality product and production efficiency, can meet the demand of different industries to different grade ferronickel granules simultaneously.
S300: separation
According to embodiments of the invention, in this step, the metallized pellet of preparing in step S2 carries out fragmentation and dry type magnetic separation, separation obtains ferronickel granule and the first tailings, then, the first tailings is carried out to wet grinding and wet magnetic separation, so that separation obtains ferronickel powder and the second tailings.
According to embodiments of the invention, separated means are not particularly limited.For example, according to some embodiments of the present invention, first reduction gained metallized pellet is carried out after simple crushing, more just can be fine that ferronickel granule is separated with slag by dry type magnetic separation, high-quality ferronickel granule obtained.Thus, save molten minute of electric furnace or the molten minute flow process of non-electric furnace in other technique, reduced cost of investment, energy-conservation efficient again.
When concrete operations, can, according to the character of former red soil nickel ore, select whether again the tailings after dry type magnetic separation to be carried out to the choosing of wet type mill, to improve the rate of recovery of nickel, meanwhile, the tailings of final gained can be used for preparing building materials, finally realizes the solid waste zero release of whole technical process.
According to embodiments of the invention, can to the first tailings, carry out wet grinding and wet magnetic separation further, at least one of employing wet-type ball mill and rod mill carried out one section or two stage grinding, and adopts magnetic separator to carry out one section or two stages of magnetic separation.Thus, can effectively improve the rate of recovery of nickel, obtain high-quality ferronickel granule.
According to embodiments of the invention, can be further described ferronickel powder be melted minute.Thus, can obtain high-quality Rhometal.
According to embodiments of the invention, the product category of utilizing the second tailings to prepare is not particularly limited.For example, according to some embodiments of the present invention, utilize the second tailings to prepare building materials, for example, according to other embodiment of the present invention, building materials are to be selected from least one of cast stone, devitrified glass, packing material, gelling material, artificial marine habitat.Thus, turn waste into wealth, not only can create economic worth but also can prevent tailings contaminate environment, be conducive to obtain better comprehensive treating process benefit.
Smelting laterite-nickel ores method of the present invention is except being effectively applied to metallurgical technology field, and person skilled can certainly be extended to other field, does not repeat them here, and these are all within the scope of the present invention.
Below by specific embodiment, the present invention will be described, it should be noted that these embodiment are only used to illustration purpose, and can not be construed to by any way limitation of the present invention.In addition, in the following example, if not otherwise specified, the equipment that adopted and material are commercially available.
General method
The general treatment process of processing in the back red soil nickel ore below in conjunction with 2 pairs, accompanying drawing in embodiment is described:
Raw material: reductive agent is the resulting carbon black of waste old pyrolysis, additive is one or more combinations in unslaked lime, Wingdale, rhombspar, calcium carbonate, calcium hydroxide, sodium carbonate, sodium sulfate, sodium-chlor, iron protoxide, fluorite, and fuel is the resulting carbon black of waste old pyrolysis, tar and combustible gas.
Equipment: ball equipment processed is pair roller type high-pressure ball press or balling disc, rotary hearth furnace is heat accumulating type rotary hearth furnace, has one or more heat-storage type burners on heat accumulating type rotary hearth furnace, slag iron separating device be take dry type magnetic separation as main.
Technique: the choosing of wet type mill comprises: adopt wet-type ball mill or rod mill to carry out one section or two stage grinding, then adopt magnetic separator to carry out one section or two sections and sort; Molten division technique comprises: molten minute of molten minute of electric furnace or non-electric furnace.
Product: the building material product that utilizes tailings and secondary tailings to prepare comprises: cast stone, devitrified glass, packing material, gelling material, artificial marine habitat etc., also can be used to brickmaking or build the road.
In the following example, the key step that red soil nickel ore is processed is as follows:
The first step, cleans waste old, is crushed to after appropriate size, dries.Rubber grain is distributed into pyrolysis installation by distribution device, and pyrolysis temperature is 300~900 ℃, and pyrolysis time is 10~90min, and described waste old generates the products such as carbon black, combustible gas, tar after pyrolysis.Carbon black is crushed to 1~4mm granularity.
Second step, red soil nickel ore is dry, broken and be sized to 1~4mm granularity, with the broken good carbon black of the first step, additive etc. by following weight part batching: 100 parts of red soil nickel ores, 3~30 parts of carbon blacks, 0~20 part of additive.After the mixing of materials preparing is even, adopt ball press or pelletizer ball processed, pelletizing is dried, dried carbonaceous pelletizing is distributed into rotary hearth furnace and carries out direct-reduction, the combustible gas of the first step pyrolysis gained and tar are as the fuel of dry link and rotary hearth furnace direct-reduction link, dried carbonaceous pelletizing enters rotary hearth furnace and rotates with furnace bottom, 1400~1600 ℃ of reduction temperatures, recovery time 30~120min, carbonaceous pelletizing progressively completes reduction reaction with the rotation of rotary furnace bottom, the nickel that reduction generates and the iron generating nickel abrasive grit of growing up gradually in pelletizing inside, after rotating a circle, from discharge gate, discharge metallized pellet, metallized pellet is carried out to fragmentation and dry type magnetic separation, can obtain ferronickel granule and tailings.
Can select as required whether tailings to be carried out to the choosing of wet type mill again, obtain ferronickel powder and secondary tailings.Whether ferronickel powder can be selected as required to melt and minute prepare Rhometal, and tailings or secondary tailings can be used to prepare building materials and other products.
Embodiment 1:
Adopt nickel grade 1.31 % by weight, the red soil nickel ore of all iron content 23.75 % by weight.According to red soil nickel ore: the ratio batching of carbon black: additive=100:12:10, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1500 ℃ of reduction temperatures, recovery time 60min, the metallized pellet of discharging from discharge gate is through broken, dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 14.16 % by weight.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 8.33 % by weight.The nickel total yield of whole flow process is 95.38%.Tailings and secondary tailings are used for building the road.
Embodiment 2:
Adopt nickel grade 0.72 % by weight, the red soil nickel ore of all iron content 41.93 % by weight.According to red soil nickel ore: the ratio batching of carbon black: additive=100:26:17, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1450 ℃ of reduction temperatures, recovery time 45min, the metallized pellet of discharging from discharge gate is through fragmentation and dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 4.11 % by weight.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out non-electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 6.07 % by weight.The nickel total yield of whole flow process is 98.51%.Tailings and secondary tailings are as mine packing material.
Embodiment 3:
Adopting nickel grade is 1.71 % by weight, the red soil nickel ore of all iron content 11.62 % by weight.According to red soil nickel ore: the ratio batching of carbon black: additive=100:5:20, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1550 ℃ of reduction temperatures, recovery time 105min, the metallized pellet of discharging from discharge gate is through fragmentation and dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 30.47 % by weight.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out non-electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 16.58 % by weight.The nickel total yield of whole flow process is 98.34%.
Embodiment 4
Adopt the red soil nickel ore that nickel grade is 1.28%, all iron content 25.33%.According to red soil nickel ore: the ratio batching of reductive agent: additive=100:11:11, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1520 ℃ of reduction temperatures, recovery time 70min, the metallized pellet of discharging from discharge gate is through broken, dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 15.27%.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 9.02%.The nickel total yield of whole flow process is 96.44%.Tailings and secondary tailings are used for building the road.
Embodiment 5
Adopt the red soil nickel ore that nickel grade is 0.67%, all iron content 42.51%.According to red soil nickel ore: the ratio batching of reductive agent: additive=100:30:20, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1470 ℃ of reduction temperatures, recovery time 50min, the metallized pellet of discharging from discharge gate is through fragmentation and dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 4.63%.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out non-electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 6.88%.The nickel total yield of whole flow process is 97.49%.Tailings and secondary tailings are used for brickmaking.
Embodiment 6
Adopt the red soil nickel ore that nickel grade is 1.82%, all iron content 14.55%.According to red soil nickel ore: the ratio batching of reductive agent: additive=100:8:16, after mixing, with the agglomeration of pair roller type high-pressure ball press, dried carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, carbonaceous pelletizing reduces in heat accumulating type rotary hearth furnace, 1570 ℃ of reduction temperatures, recovery time 110min, the metallized pellet of discharging from discharge gate is through fragmentation and dry type magnetic separation, and the nickel grade that obtains ferronickel granule is 35.54%.Meanwhile, for improving the rate of recovery of nickel, tailings is carried out carrying out non-electric furnace molten minute after the choosing of wet type mill, the nickel grade of molten minute gained Rhometal is 15.31%.The nickel total yield of whole flow process is 98.49%.
The present embodiment, by having adopted the rotary hearth furnace equipment of regenerative combustion technology, can well be controlled reduction temperature and suitable reducing atmosphere, realizes the selective reduction of nickel.By controlling recovery time and the interpolation appropriate additive of carbonaceous pelletizing in rotary hearth furnace, under the reduction temperature of 1570 ℃, the reduction of iron is suppressed, and nickel is fully reduced to ferronickel granule.Therefore, after dry type magnetic separation, can obtain nickel grade up to 35.54% ferronickel granule.Meanwhile, it is raw material that present case be take tailings and secondary tailings, by rational proportion, has prepared the silicate cement that meets composite Portland cement 325 standards, has realized comprehensive utilization and the cleaner production of red soil nickel ore.
In the description of this specification sheets, the description of reference term " embodiment ", " some embodiment ", " illustrative examples ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention above; be understandable that; above-described embodiment is exemplary; can not be interpreted as limitation of the present invention; those of ordinary skill in the art can change above-described embodiment within the scope of the invention in the situation that not departing from principle of the present invention and aim, modification, replacement and modification, and these all drop on the scope of the present invention.

Claims (13)

1. a red soil nickel ore treatment process, is characterized in that, comprising:
Red soil nickel ore, reductive agent, additive are made to pelletizing, to obtain red soil nickel ore pelletizing;
Described red soil nickel ore pelletizing is carried out to reducing roasting in heat accumulating type rotary hearth furnace, to obtain metallized pellet;
Described metallized pellet is carried out to fragmentation and dry type magnetic separation, to obtain ferronickel granule and the first tailings; And
Described the first tailings is carried out to wet grinding and wet magnetic separation, to obtain ferronickel powder and the second tailings.
Wherein,
The carbon black of described reductive agent for being prepared by rubber.
2. method according to claim 1, is characterized in that, described carbon black obtains through the following steps: will be by by rubber pyrolysis 10~90min at 300~900 ℃, to obtain carbon black, combustible gas and tar.
3. method according to claim 1 and 2, is characterized in that, further comprises that it is 1~4mm that the resulting carbon black of pyrolysis is crushed to granularity.
4. method according to claim 2, is characterized in that, the fuel using described combustible gas and tar as reducing roasting.
5. method according to claim 1, it is characterized in that, red soil nickel ore based on 100 weight parts, the consumption of carbon black is 3~30 weight parts, the consumption of additive is 0~20 weight part, and described additive is to be selected from least one of unslaked lime, Wingdale, rhombspar, calcium carbonate, calcium hydroxide, sodium carbonate, sodium sulfate, sodium-chlor, iron protoxide and fluorite.
6. method according to claim 1, is characterized in that, described reducing roasting is at 1400~1600 ℃, to carry out 30~120min.
7. according to the method described in claim 5 or 6, it is characterized in that, the red soil nickel ore based on 100 weight parts, the consumption of carbon black is 8 weight parts, and the consumption of additive is 16 weight parts, and described reducing roasting is at 1570 ℃, to carry out 110min.
8. method according to claim 7, is characterized in that, the red soil nickel ore based on 100 weight parts, and the consumption of carbon black is 11 weight parts, and the consumption of additive is 11 weight parts, and described reducing roasting is at 1520 ℃, to carry out 70min.
9. method according to claim 8, is characterized in that, the red soil nickel ore based on 100 weight parts, and the consumption of carbon black is 30 weight parts, and the consumption of additive is 20 weight parts, and described reducing roasting is at 1470 ℃, to carry out 50min.
10. method according to claim 1, is characterized in that, described heat accumulating type rotary hearth furnace is provided with at least one heat-storage type burner.
11. methods according to claim 1, is characterized in that, the nickel grade of described red soil nickel ore is greater than 0.6 % by weight.
12. methods according to claim 1, is characterized in that, described the first tailings are carried out to wet grinding and wet magnetic separation further comprises:
At least one of employing wet-type ball mill and rod mill carried out one section or two stage grinding; And
Adopt magnetic separator to carry out one section or two stages of magnetic separation.
13. methods according to claim 1, is characterized in that, further comprise:
Described ferronickel powder is melted minute, to obtain Rhometal; And
By described the second tailings for the preparation of building materials,
Wherein,
Described building materials are to be selected from least one of cast stone, devitrified glass, packing material, gelling material, artificial marine habitat.
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CN107177741A (en) * 2017-05-18 2017-09-19 江苏省冶金设计院有限公司 The method and system of ferronickel is prepared using lateritic nickel ore
CN107200478A (en) * 2016-03-18 2017-09-26 广西大学 Method of glass ceramics of Color tunable and products thereof and application are prepared using iron-nickel alloy Water Quenching Slag
CN107217154A (en) * 2017-05-18 2017-09-29 江苏省冶金设计院有限公司 Handle the method and system of lateritic nickel ore

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CN104694972A (en) * 2015-02-06 2015-06-10 铜陵百荣新型材料铸件有限公司 Method for preparing ferro-nickle alloy from laterite nickel ore
CN104946881A (en) * 2015-06-19 2015-09-30 西安建筑科技大学 Method for preparing nickel-iron alloy and cementitious material from laterite nickel ores
CN107200478A (en) * 2016-03-18 2017-09-26 广西大学 Method of glass ceramics of Color tunable and products thereof and application are prepared using iron-nickel alloy Water Quenching Slag
CN105925818A (en) * 2016-06-13 2016-09-07 江苏省冶金设计院有限公司 Method and system for processing high-iron laterite nickel ore
CN106222447B (en) * 2016-09-13 2018-08-28 江苏省冶金设计院有限公司 A kind of pyrolysis of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group and reduction reaction system and method
CN106191465A (en) * 2016-09-13 2016-12-07 江苏省冶金设计院有限公司 A kind of reduction reaction system and method for the efficient aqueous pelletizing of process lateritic nickel ore
CN106222447A (en) * 2016-09-13 2016-12-14 江苏省冶金设计院有限公司 The pyrolysis of a kind of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group and reduction reaction system and method
CN106222449A (en) * 2016-09-13 2016-12-14 江苏省冶金设计院有限公司 The pyrolysis of a kind of fume afterheat furnace interior recycling type high efficiente callback lateritic nickel ore dry bulb group and reduction reaction system and method
CN106222449B (en) * 2016-09-13 2018-08-28 江苏省冶金设计院有限公司 A kind of pyrolysis of fume afterheat furnace interior recycling type high efficiente callback lateritic nickel ore dry bulb group and reduction reaction system and method
CN106191464A (en) * 2016-09-13 2016-12-07 江苏省冶金设计院有限公司 The pyrolysis of a kind of lateritic nickel ore dry bulb group and reduction reaction system and method
CN106191431B (en) * 2016-09-13 2018-07-13 江苏省冶金设计院有限公司 A kind of reduction reaction system and method for the aqueous pelletizing of lateritic nickel ore
CN106191431A (en) * 2016-09-13 2016-12-07 江苏省冶金设计院有限公司 A kind of reduction reaction system and method for the aqueous pelletizing of lateritic nickel ore
CN106191465B (en) * 2016-09-13 2018-07-13 江苏省冶金设计院有限公司 A kind of reduction reaction system and method for the aqueous pelletizing of efficient process lateritic nickel ore
CN106191464B (en) * 2016-09-13 2018-07-10 江苏省冶金设计院有限公司 A kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and method
CN106755954A (en) * 2016-11-17 2017-05-31 江苏省冶金设计院有限公司 The processing method of lateritic nickel ore
CN106811595A (en) * 2017-03-24 2017-06-09 江苏省冶金设计院有限公司 The system and method for processing vanadium titano-magnetite
CN107217154A (en) * 2017-05-18 2017-09-29 江苏省冶金设计院有限公司 Handle the method and system of lateritic nickel ore
CN107177741A (en) * 2017-05-18 2017-09-19 江苏省冶金设计院有限公司 The method and system of ferronickel is prepared using lateritic nickel ore

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