CN110144470B - Laterite-nickel ore rotary kiln reduction-blowing smelting process - Google Patents
Laterite-nickel ore rotary kiln reduction-blowing smelting process Download PDFInfo
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- CN110144470B CN110144470B CN201910492256.1A CN201910492256A CN110144470B CN 110144470 B CN110144470 B CN 110144470B CN 201910492256 A CN201910492256 A CN 201910492256A CN 110144470 B CN110144470 B CN 110144470B
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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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
- C21B13/085—Making spongy iron or liquid steel, by direct processes in rotary furnaces wherein iron or steel is obtained in a molten state
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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
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
Abstract
The invention provides a rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ore, which adopts the steps that raw materials of natural laterite low-grade nickel ore containing 0.8-3% of nickel and 15-30% of iron are added with carbon-containing materials and mixed with the raw materials, and the whole-flow continuous operation of drying, boiling dehydration, low-temperature water gasification reduction, medium-temperature dry gas reduction, high-temperature strong reduction, high-temperature oxygen-enriched blowing and separation and derivation of metal and clay at the front end of a rotary kiln is completed in one rotary kiln; wherein the low temperature is not more than 400 ℃, the medium temperature is not more than 700 ℃, the high-temperature strong reduction temperature is 1100-1300 ℃, and the high-temperature converting temperature is 1300-1600 ℃. The process of the invention is a short-flow process which is implemented by feeding the mixed carbon-containing material into the kiln and finally carrying out high-temperature smelting process treatment on the carbon-containing mixed material in a rotary kiln, and finally, high-quality metal products, high-temperature calcined clay products with high stability and high-purity smoke particles are obtained, and the products are completely harmless.
Description
Technical Field
The invention belongs to the technical field of chemical metallurgy, and particularly relates to a rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ore.
Background
Nickel is a silvery white metal with many excellent physical and chemical properties, a high melting point (1453℃), strong magnetic properties, good catalytic properties, corrosion resistance and ease of electroplating. Because of these excellent properties, nickel is widely used in the production of corrosion-resistant alloy steels in the stainless steel, petroleum, chemical and mechanical manufacturing industries, high-temperature alloy steels in the aerospace field, magnetic electrical alloys, catalysts, electroplating and other industries. With the development of these fields, particularly the rapid development of the stainless steel industry, the demand for nickel will further increase. The nickel resources which can be developed and utilized at present are mainly nickel sulfide ores and nickel laterite ores.
The laterite-nickel ore is a nickel-containing high-iron clayey mineral with the properties of 1-3% of nickel and 15-30% of iron. Mixing coal or coke powder into red soil, and reducing and high-temperature melting and decomposing to extract the ferronickel alloy. The ferronickel alloy is an iron alloy raw material for producing stainless steel. In China, laterite-nickel ore is lack of resources and basically depends on import.
The main purpose of a laterite smelting process is to extract the nickel from the laterite.
The existing smelting process of the laterite-nickel ore is mainly divided into three types:
the first is a smelting process which is carried out by three steps of drying raw materials, carrying out secondary high-temperature pre-reduction on carbon-containing mixed raw materials and carrying out high-temperature melting and sedimentation on materials, and the smelting method is also called as an RKEF method. The final product obtained by the smelting method is ferronickel water, and the rest 80 percent of clay slag becomes 'solid waste' with excessive heavy metals and needs secondary treatment. In the "RKEF" process, at least three metallurgical furnaces are used: two rotary kilns are respectively adopted in the drying and material activation pre-reduction processes, and a closed ore-smelting electric furnace is adopted for high-temperature melting and sedimentation of materials.
The second is a molten pool blowing method of the two-stage smelting process: the method is characterized in that raw material drying and carbon-containing mixed material oxygen-enriched high-temperature blowing are adopted, the materials are melted and then are settled and separated in a molten pool at the lower part of a furnace body, the final product is molten nickel iron, and about 80% of the clay slag with excessive heavy metals belongs to solid waste and needs secondary treatment. In the "bath converting process", at least two metallurgical furnaces are used: the rotary kiln is adopted in the drying of the raw materials, and the oxygen-enriched melting pool converting furnace is adopted in the high-temperature converting of the materials.
The third is a one-step smelting process: this process is less used. The specific process comprises the following steps: the raw materials are dry and the carbon-containing mixed materials form a semi-molten state in the high-temperature rotary kiln, the molecular structure of laterite is broken, nickel-iron particle clusters appear, then the materials are taken out of the kiln for water quenching, the ferronickel is selected out from the materials after the water quenching through a plurality of levigating magnetic processes, a one-step smelting process is followed by a plurality of machining grinding processes, the production line is elongated, the energy waste is large, the process operation range is narrow and difficult to control, and therefore the process is difficult to popularize. The process is originated and implemented by the iron and steel company of the great river mountain, also called as the great river mountain method.
The rotary kiln in the laterite smelting process in the prior art is often used as raw material drying equipment, comprehensive recovery of a part of laterite raw materials is omitted or discarded, the process is relatively simple in arrangement purpose, and harmless treatment of slag remained in the smelting process is not considered. And clay component in laterite (dry ore)Occupies more than 70 percent of raw ore components, and traditionally, the purpose, the implementation route and the operation process of the smelting process are relatively simple. The rare earth components are refined into ferronickel through various smelting processes, and the ferronickel is used as a source of ferronickel alloy of stainless steel. Due to SiO in the red soil2When the content of the non-metallic ore is several times of that of Fe and several times of that of Ni, in the process of extracting the ferronickel, whether a process production line and investment cost are as short as possible or not is determined, and in a controllable process form which is more economical and more environment-friendly, the metal ferronickel alloy is completely stripped from the laterite in the process of extracting the ferronickel, so that the method is the only standard for determining whether the metallurgical extraction process is scientific and reasonable. Expressed as the recovery of ferronickel. If the comprehensive recovery rate of nickel and iron is more than 97%, the content of metal oxide impurities in the residual laterite metallurgical slag reaches the national component standard of nonmetal clay, and the residual laterite metallurgical slag can be used as a high-quality building material after high-temperature calcination in full; otherwise, the heavy metal components of the residual ferronickel contained in the residue cause the residue to be solid waste which pollutes the environment, and secondary treatment is also needed, thus having huge cost.
Based on the above problems, there is still a need to develop a process and equipment which are energy-saving, environment-friendly, high-quality, efficient and easy to operate.
Disclosure of Invention
In view of the above, the invention aims to provide a rotary kiln converting metallurgy short-flow process for laterite-nickel ore, which solves the problems that raw material dehydration operation needs to be carried out independently, multiple devices or multiple steps are needed, and secondary treatment is needed for products in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ore, which adopts the steps that raw materials are natural laterite low-grade nickel ore containing 0.8-3% of nickel and 15-30% of iron, carbon-containing materials are added and mixed with the raw materials, and the whole-flow continuous operation of drying, boiling dehydration, low-temperature water gasification reduction, medium-temperature dry gas reduction, high-temperature strong reduction, high-temperature oxygen-enriched blowing and separation and derivation of metal and clay at the front end of a rotary kiln is completed in one rotary kiln; wherein the low temperature is not more than 400 ℃, the medium temperature is not more than 700 ℃, the high-temperature strong reduction temperature is 1100-1300 ℃, and the high-temperature converting temperature is 1300-1600 ℃; the water content of the mixed material is 8-30%, the carbon content is 10-30%, and the sulfur content is 0-20%.
Preferably, the feeding end is fed in a continuous feeding mode, and the material is collected at the discharging end in a continuous discharging mode; the material at the discharge end is in the states of metal flow beams, metal liquid frits and metal liquid aggregates; the separated clay is in a softened semi-molten block shape, and the metal liquid clinker and the metal liquid aggregate are wrapped or entrained by the softened clay block and are periodically discharged in a form of mutual insertion and mutual noninterference at different positions.
Preferably, the separated high-purity high-activity metal oxide particles and high-purity high-activity non-metal oxide particles are collected by a smoke collecting device arranged at the port of the rotary kiln cylinder and are periodically taken out.
Preferably, the mixed material is attached to the inner surface of the rotary kiln in the rotary kiln, a spiral rotating track is carried out, the mixed material rolls along the inner surface to advance, climb and turn and fall, metal is gathered into independent metal flow beams in the running process and is stripped from clay, a rolling type metal melting pool and metal flow beams at the front end of the rotary kiln are formed, and the metal and the clay are discharged at different spatial positions of the rotary kiln.
Preferably, the kiln head of the rotary kiln is provided with a burner for carrying out high-temperature injection in the rotary kiln, and simultaneously, air or oxygen is injected into the rotary kiln, so that the temperature of flue gas in the kiln reaches 1400-1600 ℃.
Preferably, a heat-preservation receiving bag is arranged at the discharge end of the rotary kiln, and separated metal flow beams enter the heat-preservation receiving bag after separated materials are separated from the rotary kiln.
Preferably, the front-section high-temperature area of the rotary kiln is made of stainless steel, and a water cooling jacket is arranged.
Preferably, a full-flow intelligent monitoring system is configured.
Compared with the prior art, the process of the invention is a short-flow process which is implemented by feeding the mixed carbon-containing material into the kiln and finally carrying out high-temperature smelting process treatment on the carbon-containing mixed material in a rotary kiln. According to different properties of materials and final product requirements, the rotary kiln is specially designed and customized to manufacture and process instead of the conventional commercial rotary kiln. The high-temperature rotary short-flow process of the horizontal rotary kiln for the customized rotary kiln finally obtains high-quality metal products, high-temperature calcined clay products with high stability and high-purity smoke dust particles, and the products are all harmless.
In the short-flow process of reduction-blowing smelting of the rotary kiln, a raw material thermal drying dehydration process is not adopted, and water in the raw material is directly introduced into the short-flow process of the rotary kiln; water as a ingredient component enters into the material balance calculation of the smelting process and the energy efficiency conversion calculation of the smelting process, and plays an important role.
The rotary kiln reduction-blowing smelting short-flow process can meet the requirement of physical working environment for separating metal from clay in the laterite smelting process in the rotary kiln cylinder in the implementation process. The front high-temperature zone of the rotary kiln is made of stainless steel and is provided with a forced water cooling jacket. The front end of the rotary kiln is provided with a flame injection device and a device for supplementing air and oxygen, the middle rear part of the rotary kiln is provided with a hot flue gas supplementing hole, and the feed end material at the rear part of the rotary kiln is provided with a hot flue gas supplementing device. The front end of the rotary kiln is provided with a nickel molten iron heat-preservation receiving bag and a high-temperature clay dry slag receiving device, the clay dry slag receiving device is matched with hot flue gas heat collection and transmission energy-saving equipment, on one hand, the clay after high-temperature calcination is rapidly cooled, and on the other hand, the calcined clay on a transmission belt is magnetically separated to remove iron. And then, the high-temperature calcined clay enters a prepared dry slag pit, is naturally cooled, is crushed and further is subjected to magnetic separation to remove iron, and is detected. If the iron content and the carbon residue content reach the national standard, the dry slag is completely converted into a high-temperature calcined clay product for sale. The heat collected during the cooling process of the high-temperature calcined clay can enter a heat recycling system of a factory. The high-temperature flue gas recovery system is arranged at the upper part of the front end of the rotary kiln, and the flue gas particles are collected, packaged, sold and the like in different regions according to the physical characteristics of the flue gas particles.
The high-temperature smelting short-flow process is not only applied to the refining of the laterite-nickel ore, but also applied to the short flow of various low-grade lean ores.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a short reduction-blowing smelting process of a rotary kiln according to the present invention;
1-a drying section; 2-a boiling dehydration section; 3-a low temperature water gas reduction section; 4-medium temperature dry gas reduction section; 5-high temperature strong reduction section; 6-high temperature oxygen-enriched air refining section; 7-separating the lead-out section; 8-a burner; 9-heat preservation bag connection; 10-water cooling jacket; 11-metal stream; 12-a smoke collection device; 13-magnetic separation.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the technical field better understand the scheme of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The raw materials used in the present invention are commercially available.
Example 1
The embodiment provides a rotary kiln converting metallurgy short-flow process of laterite-nickel ore, as shown in fig. 1, carbon-containing materials are added into natural laterite low-grade nickel ore raw materials containing 1-3% of nickel and 15-30% of iron and containing sulfur or not containing sulfur, the raw materials are mixed together, the mixture is processed in a rotary kiln, and the seven working sections including a drying section 1, a boiling dehydration section 2, a low-temperature water gasification reduction section 3, a medium-temperature dry gas reduction section 4, a high-temperature strong reduction section 5, a high-temperature oxygen-enriched converting section 6 and a separation leading-out section are sequentially performed to complete the full-flow continuous operation of drying, boiling dehydration, low-temperature water gasification reduction, medium-temperature dry gas reduction, high-temperature strong reduction and high-temperature oxygen-enriched converting of water-containing mixed materials, and separation of metal and clay at the front end of the rotary kiln to. The method specifically comprises the following steps: the method comprises the steps of feeding a mixed material containing moisture into a rotary kiln, sequentially carrying out low-temperature boiling roasting, medium-temperature reduction roasting, high-temperature strong reduction roasting and high-temperature converting to separate heavy metals containing ferronickel in the mixed material to form high-temperature molten nickel iron flow beams, further separating to obtain light metals containing magnesium and a high-temperature semi-molten forsterite clay calcined material, and oxidizing the light metals containing magnesium to form micro dust which enters flue gas to be collected. Wherein the low-temperature roasting temperature is not more than 400 ℃, the medium-temperature reduction roasting temperature is not more than 700 ℃, the high-temperature strong reduction roasting temperature is 1100-1300 ℃, and the high-temperature converting temperature is 1300-1600 ℃; wherein the allowable value of water content in the mixed material is 8-30%, the allowable value of carbon content is 10-30%, and the allowable value of sulfur content is 0-20%.
In order to achieve the energy required for decomposing and separating the metal and the clay of the laterite-nickel ore in a rotary kiln, the inherent moisture of the raw ore is kept in the laterite raw material mixed with carbon, and the water is the additional energy introduced in the process specially intended by the inventor. After the water is introduced into the short flow path, the reduction reaction intensity of the whole short flow path of the rotary kiln is guided, activated and strengthened. In different temperature stages, water is respectively converted into steam energy and chemical energy, and the steam energy and the chemical energy are combined with active substances such as carbon, sulfur and the like in the raw materials to excite, guide and strengthen the reaction process and the reaction energy level of the materials. In the short process, in the temperature range of 100-350 ℃, water is boiled and converted into water vapor, rising of the water vapor drives materials to generate a plurality of activation reactions such as boiling, friction, activation, temperature rise and the like, and the reactions promote synthesis of low-temperature water gas, so that low-temperature reduction reaction of the water gas and the materials in mutual friction at lower temperature of no more than 400 ℃ is caused, and then medium-temperature reduction reaction of the materials and the water gas which are continuously accelerated at no more than 700 ℃ is initiated and generated, and the temperature is continuously raised until the materials and dry gas generate high-temperature reduction reaction until the high-temperature materials and the dry gas generate strong-level reduction reaction at high temperature of 1100-1300 ℃. The reduction reaction initiated and activated by water directly destroys and destroys the material structure in the laterite ore, reduces the metal elements and remains high-temperature clay.
In the embodiment, the feeding and discharging modes of the mixed material are continuous feeding and continuous discharging, and the material at the discharging end is in a state of metal flow beam, metal liquid frit and metal liquid aggregate; the residual clay is in a softened semi-molten block shape, and the metal frits and the metal aggregates are wrapped or entrained by the softened clay block and are periodically discharged in a form of mutual interpenetration and non-interference at different positions. The high-purity and high-activity metal oxide particles and the high-purity and high-activity nonmetal oxide particles are periodically taken out from the smoke dust collecting device 12 arranged at the end port of the rotary kiln barrel, the effective recovery rates of the three materials are more than 90 percent, and the three materials all reach the national environmental protection emission standard.
The invention brings the rotary mechanical energy of the rotary kiln into the process, according to the inherent equipment characteristics that the material rotates in a spiral way during the rotation of the rotary kiln and the material is attached to the inner surface of the rotary kiln and rolls along the inner surface to climb and then turn over and fall, the metal is gathered into independent metal flow beams by utilizing the specific gravity difference of the metal and the clay and the running track difference during the running, and the metal and the clay are stripped to form a rolling metal melting pool and a metal flow beam at the front end of the rotary kiln, so that the metal and the clay are discharged at different spatial positions of the rotary kiln.
In addition, in the embodiment, the high-temperature area at the front end of the rotary kiln is made of stainless steel, and a forced water cooling jacket 10 is arranged; the burner 8 is arranged at the kiln head of the rotary kiln to spray air or oxygen into the kiln while carrying out high-temperature injection in the kiln, so that the temperature of flue gas in the kiln reaches 1400-1600 ℃, carbon elements in materials of the rotary kiln are rapidly combined with oxygen at high temperature, the smelting state of mixed materials in the kiln is rapidly converted into a strong oxidation state from a high-temperature strong reduction state, a laterite structure is decomposed and collapsed, metal walls are broken to sink towards the bottom of the rotary kiln, finally, metal flow beams 11 are formed, and the metal flows out of the rotary kiln from the bottom of the discharge end face of the rotary kiln. The other semi-molten clay floating on the surface of the metal flow beam rises along with the outflow of the metal flow beam and the rotation of a node on one end surface of the rotary kiln, the semi-molten clay is screwed out of the rotary kiln at a position higher than the end surface after a time sequence, and the screwed-out position is not coincident with the outflow space position of the metal flow beam, so that the separation of slag and iron is realized. After leaving the rotary kiln, most metal alloy flow beams enter a heat-preservation receiving bag 9, the cooling speed and the volume shrinkage rate of individual scattered metal particles are larger than those of molten clay, although the metal alloy flow beams are mixed in clay materials and are not adhered to each other, the difference of the material properties of metal and nonmetal is gradually increased along with the reduction of the temperature, the metal alloy flow beams are separated from each other to form two completely different high-stability materials, and the two completely clean metal alloy flow beams are completely separated by magnetic separation 13 times and 13 times normally.
In the short-flow process of the embodiment, no raw material thermal drying dehydration process is used, but water in the raw material is directly introduced into the short rotary kiln process. Water as a ingredient component enters into the material balance calculation of the smelting process and the energy efficiency conversion calculation of the smelting process, and plays an important role. Through the short-flow process, high-quality metal products, high-stability high-temperature calcined clay products and high-purity smoke particles are finally obtained, and the products are completely harmless. In the process of the process operation, the prepared mixed raw materials are fed from a feed end at the tail of the kiln, and the direct separation and discharge of metal and nonmetal are achieved at a high-temperature discharge end at the head of the kiln, so that three valuable resource substances are obtained: complete molten nickel metal iron flow, forsterite high-temperature calcined clay reaching the national environmental protection standard and high-activity magnesia, iron oxide and silica fume particles.
The core thermal equipment of the rotary laterite-nickel ore kiln converting metallurgy short-process is only one rotary kiln. The prepared raw materials are started when entering the rotary kiln, and the special comprehensive configuration of the kiln head of the rotary kiln enables the rotary kiln to have the generation and bearing capacity of various metallurgical process environments. The kiln is divided into a preheating and drying functional zone, a low-temperature boiling functional zone, a low-temperature pre-reduction reaction zone, a medium-temperature reduction reaction zone, a high-temperature reinforced blowing zone in front of the kiln and a high-temperature metal separation and discharge zone at the kiln head, the maximum reaction temperature of materials in the kiln can be above 1500 ℃ after long-term use in seven different working sections, the temperature condition and the separation time condition of nickel-iron metal and non-metal clay are achieved, and the complete separation of nickel-iron alloy and clay at different positions at the kiln mouth is realized by utilizing the self-owned rotary operation mechanical energy of the kiln.
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 (7)
1. A short-flow process technology for rotary kiln reduction-blowing smelting of laterite-nickel ore adopts natural laterite low-grade nickel ore with 0.8-3% of nickel and 15-30% of iron, and is characterized in that a carbon-containing material is added and mixed with a raw material which is not subjected to a drying dehydration process, and the whole-flow continuous operation of drying, boiling dehydration, low-temperature water gas gasification reduction, medium-temperature dry gas reduction, high-temperature strong reduction, high-temperature oxygen-enriched blowing and separation and derivation of metal and clay at the front end of a rotary kiln is completed in one rotary kiln; wherein the low temperature is not more than 400 ℃, the medium temperature is not more than 700 ℃, the high-temperature strong reduction temperature is 1100-1300 ℃, and the high-temperature converting temperature is 1300-1600 ℃; the water content of the mixed material is 30%, the carbon content is 10% -30%, and the sulfur content is 0-20%; and the kiln head of the rotary kiln is provided with a burner to perform high-temperature injection in the rotary kiln, and simultaneously, air or oxygen is injected into the rotary kiln, so that the temperature of flue gas in the kiln reaches 1400-1600 ℃.
2. The rotary kiln reduction-blowing smelting short-process for laterite-nickel ores according to claim 1, characterized in that the materials are fed to a feeding end in a continuous feeding manner, and the materials are collected at a discharging end in a continuous discharging manner; the separated clay is in a softened semi-molten block shape, and the metal liquid clinker and the metal liquid aggregate are wrapped or entrained by the softened clay block and are periodically discharged in a mutually-inserted and non-interfering manner at different positions.
3. The rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ores according to claim 1, characterized in that the separated high-purity high-activity metal oxide particles and high-purity high-activity non-metal oxide particles are collected by a smoke dust collecting device arranged at a port of a rotary kiln cylinder and are periodically taken out.
4. The rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ores according to claim 1, characterized in that the mixed material is attached to the inner surface of the rotary kiln in the rotary kiln, and is spirally rotated, and is rolled to advance along the inner surface and climb up and then turn down, so that the metal is gathered into independent metal flow beams in the operation process, and the metal flow beams are peeled off from clay to form a rolling metal bath and metal flow beams at the front end of the rotary kiln, and the metal and the clay are discharged from different space positions of the rotary kiln.
5. The rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ores according to claim 1, characterized in that a heat-preservation receiving ladle is arranged at the discharge end of the rotary kiln, and separated metal flow beams enter the heat-preservation receiving ladle after separated materials are separated from the rotary kiln.
6. The rotary kiln reduction-blowing smelting short-flow process for laterite-nickel ores according to claim 1, characterized in that a high-temperature zone at the front section of the rotary kiln is made of stainless steel and is provided with a water cooling jacket.
7. The rotary kiln reduction-blowing smelting short-process for laterite-nickel ores according to any one of claims 1 to 6, characterized in that a full-process intelligent monitoring system is configured.
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| AU754715B2 (en) * | 1998-04-06 | 2002-11-21 | Billiton S.A. Limited | Upgrading of nickel laterite ores |
| CN101403043A (en) * | 2008-10-27 | 2009-04-08 | 昆明理工大学 | Method for producing ferronickel granule with direct reduction of laterite nickel mine with rotary kiln |
| CN101538626A (en) * | 2009-05-06 | 2009-09-23 | 毛黎生 | Method for directly producing nickel-bearing pig iron in rotary kilns by using laterite-nickel |
| CN102660672B (en) * | 2012-04-28 | 2014-05-07 | 刘光火 | Process for smelting low-grade laterite |
| CN105463147A (en) * | 2015-07-17 | 2016-04-06 | 北海诚德镍业有限公司 | Method for producing nickel iron powder by directly reducing nickel laterite ores in rotary kiln |
| CN105714009A (en) * | 2016-04-29 | 2016-06-29 | 余金铭 | Method and device for preparing ferronickel from laterite nickel ores |
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Effective date of registration: 20210624 Address after: 471621 Fengli Industrial Zone, Luoyang City, Henan Province Patentee after: Luoyang Luohua powder engineering special refractory Co.,Ltd. Patentee after: Li Chaoxia Patentee after: Huang He Address before: 471000 Room 102, gate 5, building 3, block 1, Longping Road, Jianxi District, Luoyang City, Henan Province Patentee before: Li Chaoxia Patentee before: Huang He |