CN107022678B - Method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore - Google Patents
Method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore Download PDFInfo
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- CN107022678B CN107022678B CN201710471967.1A CN201710471967A CN107022678B CN 107022678 B CN107022678 B CN 107022678B CN 201710471967 A CN201710471967 A CN 201710471967A CN 107022678 B CN107022678 B CN 107022678B
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/005—Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process
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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
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/021—Obtaining nickel or cobalt by dry processes by reduction in solid state, e.g. by segregation processes
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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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/12—Dry methods smelting of sulfides or formation of mattes by gases
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Abstract
the invention provides a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore, which specifically comprises the following steps: mixing laterite-nickel ore, a reducing agent and an additive to obtain a mixture; briquetting the mixture to obtain green briquettes; drying the green agglomerates, and then carrying out selective reduction in a reducing atmosphere to obtain a reduction product; and grinding and magnetically separating the reduction product to obtain the ferronickel concentrate. The preparation method provided by the invention has the advantages that the temperature of selective reduction is reduced, the reduction of iron is inhibited, and the selectivity of the reduction process is improved, so that the direct reduction effect of nickel in the humus type laterite-nickel ore is enhanced, and the prepared ferronickel concentrate has high grade and recovery rate.
Description
Technical Field
The invention relates to the technical field of metallurgy and material science, in particular to a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore.
Background
The pyrometallurgical process of low-grade laterite-nickel ore plays a significant role in the resource economy and the steel industry of China. From the industrial aspect, China has become the world with the largest consumption of nickel since 2005, mainly due to the increase of stainless steel production and demand in China. Because of the scarcity of waste steel resources in China, the stainless steel smelted by the electric furnace still mainly takes the crude ferronickel as a main raw material, and the direct reduction-electric furnace smelting production of the ferronickel is the only pyrometallurgical process which is mature and applied to the industrial production of the laterite-nickel ore at present. Therefore, the process for smelting ferronickel by adopting the pyrogenic process is very consistent with the current situation of the steel industry in China. Due to the vigorous demand of domestic stainless steel and the low price of imported low-grade laterite-nickel ore, the pyrometallurgical smelting of low-grade laterite-nickel ore still has great significance for resources in China and the steel industry. Therefore, the research on the beneficiation and nickel enrichment of the laterite-nickel ore after the selective reduction treatment is imperative.
Theoretically speaking, the research on the selectivity mechanism of the laterite-nickel ore mainly focuses on two aspects, namely the selective reduction of nickel oxide relative to iron oxide and the growth of nickel-iron metal particles in the reduction process. And the two aspects are bottlenecks for limiting the reduction treatment-magnetic separation process of the laterite-nickel ore. At present, people mainly control reduction process factors such as reduction temperature, time and reducing agent dosage to realize selective reduction of laterite-nickel ore, but have the problems of overhigh reduction temperature, high pulverization rate of pellets, serious ring formation, poor selective reduction effect, difficult magnetic separation caused by insufficient growth of ferronickel grains and the like.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a method for preparing nickel-iron concentrate by selectively reducing laterite-nickel ore, which can reduce the temperature of selective reduction, inhibit the reduction of iron and improve the selectivity of the reduction process, thereby achieving the aim of strengthening the direct reduction effect of nickel in the humus type laterite-nickel ore.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
A method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore specifically comprises the following steps:
S1, mixing the laterite-nickel ore, the reducing agent and the additive to obtain a mixture;
s2, briquetting the mixture to obtain a green briquette;
S3, drying the green agglomerates, and then carrying out selective reduction in a reducing atmosphere to obtain a reduction product;
S4, grinding and magnetically separating the reduction product to obtain ferronickel concentrate.
In the above method, preferably, in the step S1, the laterite-nickel ore is limonite type laterite-nickel ore and/or humus soil type laterite-nickel ore; the mass ratio of the limonite type laterite-nickel ore to the humus type laterite-nickel ore is 6: 4-5: 5.
In the above method, preferably, the step S1 further includes a preprocessing step, specifically: drying and crushing the laterite-nickel ore until the granularity is less than 0.074mm and accounts for more than 75%.
In the above method, preferably, in the step S1, the reducing agent is coal and/or graphite, and when the reducing agent is a mixture of coal and graphite, the mass ratio of coal to graphite is 9: 1 to 7: 3. Further preferably, the particle size of the coal is less than 1 mm; the particle size of the graphite is less than 1 mm.
In the above method, preferably, in the step S1, the additive is a mixture of calcium sulfate and sodium carbonate, wherein a mass ratio of the calcium sulfate to the sodium carbonate is 8: 2 to 6: 4. Further preferably, the particle size of the calcium sulfate is less than 0.074 mm; the particle size of the graphite is less than 0.074 mm.
In the above method, the amount of the reducing agent is preferably 1 to 7 wt%.
In the above method, the additive is preferably added in an amount of 2 to 8 wt%.
In the above method, preferably, in the step S2, the pressure of the briquette is 80MPa to 100 MPa.
In the above method, preferably, in the step S3, the selective reduction is specifically: preheating at 900-1000 deg.c for 10-20 min, and reducing at 1100-1150 deg.c for 60-80 min.
Preferably, in the above method, the step S4 specifically includes: grinding the reduced product until the grain diameter of 100 percent of particles is less than 0.074mm, and then carrying out magnetic separation in a magnetic field with the magnetic field intensity of 1200 Gs-1800 Gs.
As a general technical concept, the invention also provides the ferronickel concentrate prepared by the method. Wherein the grade of iron is above 68.46%, and the grade of nickel is above 5.71%.
Compared with the prior art, the invention has the advantages that:
(1) The invention provides a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore, which is characterized in that limonite type laterite-nickel ore and humus type laterite-nickel ore are matched, and the characteristic that a silicate phase of high crystal water in the humus type laterite-nickel ore has higher activity than silicon dioxide and is easier to generate fayalite with iron oxide is utilized, so that the reduction of iron is inhibited and the selectivity of the reduction process is improved while the temperature of selective reduction is reduced, thereby achieving the aim of strengthening the direct reduction effect of nickel in the humus type laterite-nickel ore and improving the nickel grade and the nickel recovery rate. Furthermore, the mass ratio of the limonite type laterite-nickel ore to the humus type laterite-nickel ore is limited to 6: 4-5: 5, the limonite type laterite-nickel ore is high in proportion, the iron grade in the ferronickel concentrate can be improved, the recovery rate of iron and nickel can be improved along with the iron grade, but the nickel grade can be obviously reduced; the proportion of the humus soil type laterite-nickel ore is high, the iron grade in the nickel-iron ore concentrate is low, the recovery rate of iron and nickel is greatly reduced, but the nickel grade is increased, so that when the mass ratio of the limonite type laterite-nickel ore to the humus soil type laterite-nickel ore is 6: 4-5: 5, the grades of iron and nickel are guaranteed, and the recovery rate of iron and nickel is also increased.
(2) The invention provides a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore, which prepares ferronickel fine powder by a selective reduction-magnetic separation process, and throws away a large amount of gangue components, thereby improving the furnace entering grade for the subsequent high-energy power-consumption furnace smelting and greatly reducing the furnace entering treatment capacity and the slag quantity.
(3) The invention provides a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore, which inhibits the reduction of iron in limonite type laterite-nickel ore by optimizing ore blending of limonite type laterite-nickel ore and humus type laterite-nickel ore; meanwhile, an additive formed by mixing calcium sulfate and sodium carbonate according to a certain proportion is developed, so that the reduction of nickel and the growth of iron and nickel metal grains are promoted, the temperature of selective reduction is reduced, the reduction of nickel in the humus soil type laterite-nickel ore is enhanced, and the grade and the recovery rate of nickel are improved.
(4) the invention provides a ferronickel concentrate, the iron grade is above 68.46%, and the nickel grade is above 5.71%.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The materials and equipment used in the following examples are commercially available.
Example 1
A method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore comprises the following steps:
(1) Selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(3) Mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 6: 4 to obtain the laterite-nickel ore.
(4) 89wt% of laterite nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain the mixture.
(5) briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(6) Drying the raw blocks at 300 ℃, preheating for 15min at 900 ℃, and then reducing for 60min at 1100 ℃ to obtain a reduced product.
(7) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(8) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 68.71 percent, the nickel grade of 5.71 percent and the nickel recovery rate of 93.47 percent is obtained.
Example 2
a method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore comprises the following steps:
(1) Selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(3) Mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 5.5: 4.5 to obtain the laterite-nickel ore.
(4) 89wt% of laterite nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain the mixture.
(5) Briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(6) Drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(7) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(8) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 68.46 percent, the nickel grade of 5.83 percent and the nickel recovery rate of 90.45 percent is obtained.
Example 3
A method for preparing ferronickel concentrate by selectively reducing laterite-nickel ore comprises the following steps:
(1) Selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(3) Mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 5: 5 to obtain the laterite-nickel ore.
(4) 89wt% of laterite nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain the mixture.
(5) Briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(6) Drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(7) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(8) under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 67.81%, the nickel grade of 5.95% and the nickel recovery rate of 87.34% is obtained.
Comparative example 1
A method for preparing the ferronickel concentrate of the comparative example comprises the following steps:
(1) Selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(3) Mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 2: 8 to obtain the laterite-nickel ore.
(4) 89wt% of laterite nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain the mixture.
(5) briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(6) Drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(7) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(8) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 57.62 percent, the nickel grade of 5.45 percent and the nickel recovery rate of 77.34 percent is obtained.
comparative example 2
A method for preparing the ferronickel concentrate of the comparative example comprises the following steps:
(1) Selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(3) Mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 8: 2 to obtain the laterite-nickel ore.
(4) 89wt% of laterite nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain the mixture.
(5) Briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(6) drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(7) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(8) under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 74.53%, the nickel grade of 3.45% and the nickel recovery rate of 84.34% is obtained.
Comparative example 3
A method for preparing the ferronickel concentrate of the comparative example comprises the following steps:
(1) selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) 89wt% of limonite type laterite-nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of the calcium sulfate to the sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain a mixture.
(3) Briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(4) drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(5) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(6) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 82.33 percent, the nickel grade of 2.37 percent and the nickel recovery rate of 80.26 percent is obtained.
Comparative example 4
A method for preparing the ferronickel concentrate of the comparative example comprises the following steps:
(1) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) 89wt% of humus type laterite-nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain a mixture.
(3) briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(4) Drying the raw block at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1100 deg.C for 60min to obtain reduced product.
(5) And cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(6) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 32.57 percent, the nickel grade of 4.67 percent and the nickel recovery rate of 48.36 percent is obtained.
Comparative example 5
A method for preparing the ferronickel concentrate of the comparative example comprises the following steps:
(1) Selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is less than 0.074mm and accounts for more than 75%.
(2) 89wt% of humus type laterite-nickel ore, 5.0wt% of coal and 6.0wt% of additive (the additive is a mixture of calcium sulfate and sodium carbonate, the mass ratio of calcium sulfate to sodium carbonate in the mixture is 8: 2) are mixed, a proper amount of water is added to adjust the water content of the mixture to 20%, and then the mixture is uniformly mixed to obtain a mixture.
(3) briquetting is carried out on a press machine to obtain the green briquette, and the pressure of the press machine is 100 MPa.
(4) drying the raw blocks at 300 deg.C, preheating at 900 deg.C for 15min, and reducing at 1350 deg.C for 60min to obtain reduced product.
(5) and cooling the reduction product, grinding the ore until the ore grinding concentration is 50 percent and the ore grinding is carried out until the particle size of 100 percent of particles is less than 0.074 mm.
(6) Under the magnetic field with the magnetic field intensity of 1800Gs and the magnetic separation time of 6min, ferronickel concentrate with the iron grade of 32.57%, the nickel grade of 5.57% and the nickel recovery rate of 68.36% is obtained.
Compared with corresponding data of a comparative example, the method for optimizing ore blending promotes the reduction of nickel, reduces the temperature of selective reduction, improves the grade and recovery rate of nickel, can improve the recovery rate of nickel by 10-40 percent, and reduces the reduction temperature by about 200 ℃.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. The method for preparing the ferronickel concentrate by selectively reducing the laterite-nickel ore is characterized by comprising the following steps:
S1, selecting limonite type laterite-nickel ore containing 40.09% of iron and 0.97% of nickel, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the particle size is smaller than 0.074mm and accounts for more than 75%; selecting 23.16% iron-containing and 1.42% nickel-containing humus soil type laterite-nickel ore, drying at 200 ℃ until the moisture content is lower than 15%, and crushing until the granularity is less than 0.074mm and accounts for more than 75%; mixing the limonite type laterite-nickel ore and the humus type laterite-nickel ore according to the mass ratio of 5.5: 4.5 to obtain laterite-nickel ore; mixing 89wt% of laterite-nickel ore, 5.0wt% of coal and 6.0wt% of additive, adding water to adjust the water content to 20%, and uniformly mixing to obtain a mixture; the additive is a mixture of calcium sulfate and sodium carbonate, and the mass ratio of the calcium sulfate to the sodium carbonate in the mixture of the calcium sulfate and the sodium carbonate is 8: 2; the reducing agent is coal;
S2, briquetting the mixture on a press machine to obtain a green briquette; the pressure of the pressing block is 100 MPa;
S3, drying the raw blocks at 300 ℃, preheating for 15min at 900 ℃ in a reducing atmosphere, and then reducing for 60min at 1100 ℃ to obtain a reduction product;
S4, grinding the reduction product until the grain size of 100% of particles is less than 0.074mm, and then carrying out magnetic separation in a magnetic field with the magnetic field strength of 1800Gs for 6min to obtain the ferronickel concentrate.
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| CN114182155A (en) * | 2021-11-24 | 2022-03-15 | 中冶南方工程技术有限公司 | Method for preparing ferronickel by reinforcing laterite-nickel ore with waste gypsum |
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| CN100469912C (en) * | 2007-04-16 | 2009-03-18 | 中南大学 | Process for preparing nickel ferroalloy by melting and reducing laterite nickel ore |
| CN101413055B (en) * | 2008-12-09 | 2011-04-27 | 中南大学 | Process for directly preparing nickel-iron alloy powder from laterite-nickel ore |
| CN102146511A (en) * | 2011-03-17 | 2011-08-10 | 北京科技大学 | Method for reclaiming nickel and iron in laterite nickel ore by selective reduction roasting |
| CN103526046A (en) * | 2013-09-27 | 2014-01-22 | 泰州永兴合金材料科技有限公司 | Additive for reducing humus-type nickel laterite ores and application of additive |
| CN103740933B (en) * | 2014-01-24 | 2015-12-02 | 温德昌 | A kind of method of nickel oxide material production Rhometal |
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