CN101376927B - Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method - Google Patents
Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method Download PDFInfo
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- CN101376927B CN101376927B CN2008102235167A CN200810223516A CN101376927B CN 101376927 B CN101376927 B CN 101376927B CN 2008102235167 A CN2008102235167 A CN 2008102235167A CN 200810223516 A CN200810223516 A CN 200810223516A CN 101376927 B CN101376927 B CN 101376927B
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Abstract
The invention discloses a heat accumulating type rotary hearth furnace-wet sizing-submerged arc furnace nickel ore smelting method which comprises the following steps: a certain amount of lateritic nickel raw ore is dried, crushed, mixed with coal powder and caking agent, pressed into a ball containing carbon, distributed to a rotary hearth furnace by a distributing device and heated to 900 DEG C to 1250 DEG C for 10min to 40min; the ball containing carbon is reduced into a metallic ball with 70 percent to 90 percent of metallization rate, discharged by a discharge device, and directly sent into water to be cooled, milled and sized. The iron material containing nickel after milling and sizing is dried by high-temperature oxygen losing waste gas, agglomerated and then sent into a submerged arc furnace or other melting equipment to separate the slag and the iron, and produce molten iron containing nickel. The method has simple process, short process, high efficiency, does not need coking coal, is applicable in the production of ferronickel with lateritic nickel of all grades, and no waste gas, waste water and waste solid is discharged during production.
Description
Technical field
The present invention relates to the method that the short flow process of direct reduction is produced molten iron in a kind of ferrous metallurgy field, relate in particular to a kind of heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method.
Background technology
Because nickel metal excellent physical chemistry, be widely used at aspects such as national economy and military project, national defence, demand is big, is country's strategic resource in short supply.Particularly in recent years, imbalance between supply and demand is outstanding, has caused the nickel valency to soar.Therefore, how effectively to develop nickel ore resource and become the focus that the whole nation is paid close attention to.
In the prior art, adopt small furnace and electric furnace to produce the elementary alloy product of ferronickel.
There is following shortcoming at least in above-mentioned prior art:
Complex process, efficient are low, can produce a large amount of flue dust, waste gas in the production process, cause great environmental pollution and resource, energy dissipation.
Summary of the invention
The purpose of this invention is to provide that a kind of technology is simple, efficient is high, free of contamination heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method.
The objective of the invention is to be achieved through the following technical solutions:
Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method of the present invention comprises step:
At first, after red soil nickel ore raw ore drying, fragmentation, mix, be pressed into carbonaceous pelletizing with coal dust and binding agent;
Then, described carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, is heated to 900 ℃～1250 ℃, keep after 15～40 minutes, described carbonaceous pelletizing is reduced into the metallized pellet of degree of metalization 70%～90%;
Afterwards, described metallized pellet is discharged through drawing mechanism, and after directly sending in the water cooling, carries out fine grinding and sort, and the nickeliferous iron charge after fine grinding sorted is dried also agglomeration with high temperature oxygen loss waste gas;
At last, the nickeliferous iron charge after the described agglomeration is sent into fusion apparatus carry out the separation of slag iron, produce nickel-containing molten iron.
As seen from the above technical solution provided by the invention, heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method of the present invention, because will contain the powdered iron ore of nickel oxide mixes with coal and binding agent, make carbonaceous pelletizing and be distributed into rotary hearth furnace, be heated to 900 ℃～1250 ℃, kept 15～40 minutes, carbonaceous pelletizing is reduced into the metallized pellet of degree of metalization 70%～90%, and pass through fusion apparatus after metallized pellet sorted, carry out the molten branch of slag and ferronickel, produce ferronickel.Technology is simple, efficient is high, pollution-free, be applicable to the iron ore of various grade nickel oxide contents.
Description of drawings
Fig. 1 sorts the process flow sheet of buried arc furnace nickel ore smelting method for heat accumulating type rotary hearth furnace-wet method of the present invention.
Embodiment
Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method of the present invention, its preferable embodiment comprises step as shown in Figure 1:
At first, after red soil nickel ore raw ore drying, fragmentation, mix, be pressed into carbonaceous pelletizing with coal dust and binding agent;
Then, described carbonaceous pelletizing is distributed into rotary hearth furnace by distribution device, is heated to 900 ℃～1250 ℃, keep after 15～40 minutes, described carbonaceous pelletizing is reduced into the metallized pellet of degree of metalization 70%～90%;
Afterwards, described metallized pellet is discharged through drawing mechanism, and after directly sending in the water cooling, carries out fine grinding and sort, and the nickeliferous iron charge after fine grinding sorted is dried also agglomeration with high temperature oxygen loss waste gas;
At last, the nickeliferous iron charge after the described agglomeration is sent into fusion apparatus carry out the separation of slag iron, produce nickel-containing molten iron.
With the red soil nickel ore raw ore with before coal dust and binding agent mix, at first, the red soil nickel ore raw ore is at first dried, make moisture content less than 5%, carry out fine grinding then; And be mill coal with coal dust, at first carry out slightly broken, fine grinding; And be the organic or inorganic binding agent with binding agent.
The fineness of red soil nickel ore, coal dust and binding agent is that granularity 180 purposes account for more than 50%.
When again red soil nickel ore, coal dust and binding agent being pressed into carbonaceous pelletizing, adopt pair roller type ball press or balling disc.
Rotary hearth furnace can be the heat accumulating type rotary hearth furnace, contains one or more heat-storage type burners on the heat accumulating type rotary hearth furnace.The fuel used calorific value of heat accumulating type rotary hearth furnace can be 750kcal/Nm
3～9000kcal/Nm
3
Described fine grinding sorts and comprises step: at first adopt wet-type ball mill or rod mill ore grinding, adopt magnetic separator to sort then.
The temperature of described high temperature oxygen loss waste gas is 200～900 ℃, and oxygen level is less than or equal to 1% in the waste gas.
Described fusion apparatus is submerged arc furnace or ore deposit thermic arc stove, or other happy and harmonious equipment.
Described red soil nickel ore, coal dust and binding agent can be by following weight part mixing match:
Coal: 5～10 weight parts; Dust: 80～90 weight parts; Binding agent: 2～5 weight parts.
The present invention utilizes the high temperature reduction process of rotary hearth furnace, makes nickel, iron fast restore in the red soil nickel ore, degree of metalization 70%～90%; Carrying out fine grinding after the metallized pellet cooling sorts; Utilize submerged arc furnace or other fusion apparatus to carry out slag iron separation of produced nickel-containing molten iron; Required fuel and power all come from rotary hearth furnace flue gas and hard coal in the technological process, realize smelting process substituting the rare energy.
Specific embodiment:
Raw material is prepared:
Coal: various bituminous coal and hard coal;
Red soil nickel ore: the red soil nickel ore of various grades;
Binding agent: mineral binder bond or organic binder bond.
Above-mentioned raw materials is pressed following weight part proportioning: coal: 5～10 parts; Dust: 80～90 parts; Binding agent: 2～5 parts.
Method for refining:
In proportion above-mentioned three kinds of raw materials are mixed, be distributed into the heat accumulating type rotary hearth furnace after system ball, the oven dry, the fuel used calorific value of rotary hearth furnace is 750kcal/Nm3～9000kcal/Nm3.Rotary hearth furnace internal heating to 1100 ℃～1250 ℃, kept 10～40 minutes, directly be reduced to the metallized pellet of degree of metalization 70%～90%.
Directly send into the water through 800 ℃～1000 ℃ the metallized pellet that drawing mechanism is discharged from rotary hearth furnace, grind choosing after the cooling, at first adopt wet-type ball mill or rod mill to carry out ore grinding, adopt magnetic separator to sort at last.
Nickeliferous iron charge after the mill choosing is dried with high temperature oxygen loss waste gas, and oven dry is 200～900 ℃ a high temperature oxygen loss waste gas with gas, oxygen level requirement≤1% in the waste gas.Nickeliferous iron charge after the oven dry adopts pair roller type high pressure ball press or miscellaneous equipment agglomeration, forms block nickeliferous iron charge.
Block nickeliferous iron charge is sent into fusion apparatus such as submerged arc furnace or ore deposit thermic arc stove at last and is carried out slag iron separation of produced nickel-containing molten iron.
The present invention compares with other iron smelting method operational paths, and its equipment is few, less investment, technology simple, easy handling, flow process is short, efficient is high, cost is low, be easy to scale production; Very high practical value is arranged, adopt this law, saved the heavy-polluted sintering of traditional technology, coking process, replaced the coke of scarcity of resources, be a kind of non-blast furnace ironmaking method to the wide adaptability of raw material, can rationally utilize the natural resources and the energy to greatest extent with common coal dust.The laterite nickel ore and producing ferronickel that is fit to various grades, three-waste free discharge in the production process.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (9)
1. a heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method is characterized in that, comprises step:
At first, after red soil nickel ore raw ore drying, fragmentation, mix, be pressed into carbonaceous pelletizing with coal dust and binding agent, described coal dust is a mill coal;
Then, described carbonaceous pelletizing is distributed into the heat accumulating type rotary hearth furnace by distribution device, is heated to 900 ℃～1250 ℃, keep after 15～40 minutes, described carbonaceous pelletizing is reduced into the metallized pellet of degree of metalization 70%～90%;
Afterwards, described metallized pellet is discharged through drawing mechanism, and 800 ℃～1000 ℃ metallized pellet carries out fine grinding and sorts after directly sending in the water cooling, and the nickeliferous iron charge after fine grinding sorted is dried also agglomeration with high temperature oxygen loss waste gas;
At last, the nickeliferous iron charge after the described agglomeration is sent into submerged arc furnace carry out the separation of slag iron, produce nickel-containing molten iron.
2. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, described red soil nickel ore raw ore is at first dried, and makes moisture content less than 5%, carries out fine grinding then;
Described coal dust at first carries out slightly broken, fine grinding;
Described binding agent is the organic or inorganic binding agent.
3. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, the fineness of described red soil nickel ore, coal dust and binding agent is that granularity 180 purposes account for more than 50%.
4. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, when described red soil nickel ore, coal dust and binding agent are pressed into carbonaceous pelletizing, adopts pair roller type ball press or balling disc.
5. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, contains one or more heat-storage type burners on the described heat accumulating type rotary hearth furnace.
6. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 5 is characterized in that, the fuel used calorific value of described heat accumulating type rotary hearth furnace is 750kcal/Nm
3～9000kcal/Nm
3
7. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, described fine grinding sorts and comprises:
At first adopt wet-type ball mill or rod mill ore grinding, adopt magnetic separator to sort then.
8. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, the temperature of described high temperature oxygen loss waste gas is 200～900 ℃, and oxygen level is less than or equal to 1% in the described waste gas.
9. heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method according to claim 1 is characterized in that, the mixing match of described red soil nickel ore, coal dust and binding agent is:
Coal dust: 5～10 weight parts;
Red soil nickel ore powder: 80～90 weight parts;
Binding agent: 2～5 weight parts.
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| CN2008102235167A CN101376927B (en) | 2008-10-06 | 2008-10-06 | Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method |
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| CN101376927B true CN101376927B (en) | 2010-10-27 |
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| CN102643997B (en) * | 2012-04-09 | 2015-07-01 | 北京神雾环境能源科技集团股份有限公司 | Laterite-nickel ore processing method for efficiently recovering nickel resources |
| CN103436651B (en) * | 2013-08-26 | 2016-11-23 | 江苏大学 | A kind of method producing high-quality ferronickel |
| CN111635997B (en) * | 2020-06-12 | 2021-08-03 | 中南大学 | Method for smelting ferronickel alloy by directly reducing and smelting laterite-nickel ore with hydrogen |
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Assignee: Beijing Huafu Shenwu Industrial Furnace Co., Ltd. Assignor: Wu Daohong Contract record no.: 2011110000026 Denomination of invention: Heat accumulation type rotary hearth furnace-wet separation-buried arc furnace nickel ore smelting method Granted publication date: 20101027 License type: Exclusive License Open date: 20090304 Record date: 20110421 |
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