CN104032058A - Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore - Google Patents
Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore Download PDFInfo
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- CN104032058A CN104032058A CN201410202576.6A CN201410202576A CN104032058A CN 104032058 A CN104032058 A CN 104032058A CN 201410202576 A CN201410202576 A CN 201410202576A CN 104032058 A CN104032058 A CN 104032058A
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Abstract
The invention discloses a method for producing nickel-iron particles by using a coal-based reducing agent to directly reduce laterite nickel ore, belongs to the technical field of metallurgy chemical engineering, and concretely relates to a method for producing nickel-iron particles by utilizing a rotary kiln to directly reduce laterite nickel ore. The method comprises: drying laterite nickel raw ore, adding coal and additives, mixing, performing dry grinding, and preparing balls; pre-heating, then sending into the rotary kiln and performing reduction calcining; performing water quenching on materials discharged from the kiln, then performing fragmentation and fine grinding, and then performing jigging separation, so as to obtain the nickel-iron particle product, and separating a magnetic material from a tail ore part discharged from a jigging machine by using a magnet separator, returning to the kiln for reutilization. Waste heat of the tail gas of the rotary kiln is used to perform preheating drying on the raw material. The method has the characteristics of simple production, convenient operation, low energy consumption, environment friendliness and high nickel-iron recovery rate.
Description
Technical field
The invention belongs to chemical metallurgy technical field, relate to specifically a kind of method of utilizing coal base reduction agent direct-reduction laterite nickel ore and producing ferronickel grain.
Background technology
Nickel owing to having the feature such as etch resistant properties is strong, good heat resistance at multiple fields such as stainless steel, Special Alloy Steels, be used widely.Along with the development of China's stainless steel industry, the demand of nickel also increases day by day.At present, 60% nickel metal is to extract from nickel sulfide ore in the world, its mature production technology, but along with the resource of nickel sulfide ore reduces day by day, the exploitation of taking up an area the nickel oxide ore (red soil nickel ore) of ball nickel resources reserves 70% are of great practical significance.
At first to file (number of patent application: the people such as xuwei 201110051778.1) study the method for a kind of direct reduction of laterite nickel mine with rotary kiln Rhometal grain of invention, its production stage is: after red soil nickel ore pulverizing and jevigating, without oven dry, allocate carbonaceous reducing agent into, composite additive, pressure ball preheater removes nature moisture, directly enters rotary kiln reduction, output material goes out by high intensity magnetic separation through shrend ore grinding, obtains Rhometal grain.This method is by levigate reductive agent and the additive pressure ball allocated into again of red soil nickel ore later, and fine grinding while finding in actual production that if red soil nickel ore is different from reductive agent and additive, to cause mixing of materials inhomogeneous, in conjunction with not tight, the reducing degree of red soil nickel ore in rotary kiln is difficult to guarantee.In addition, the material of output goes out by high intensity magnetic separation through shrend ore grinding, and product ferronickel grade is low, and slag content is large, this technique performance difficulty in actual production.
Summary of the invention
The present invention is for overcoming the deficiencies in the prior art, a kind of method of laterite nickel ore and producing ferronickel grain is provided, respectively by utilize coal base reduction agent direct-reduction red soil nickel ore in rotary kiln, recycling jig and magnetic separator high efficiency separation go out ferronickel granule, really realize the efficient utilization of red soil nickel ore resource, can be widely used in industrial production.
Technical scheme of the present invention is as follows: a kind of method of coal-based direct reduction laterite nickel ore and producing ferronickel grain contains following processing step:
After laterite nickel raw ore is dried, allocate coal dust and other additive into and be mixed together dry grinding, then pelletizing processed; After preheating, enter rotary kiln reduction calcining; Kiln discharge material pulverizing and jevigating after shrend, screening obtains ferronickel granule product by jigging separation, and the mine tailing part that goes out jig is isolated magnetic material by magnetic separator and is returned stove and recycle.
After red soil nickel ore is dried, allocate coal dust and other additives into and be mixed together dry grinding to 200 orders and account for 90%.
Described coal dust add-on is for to allocate 3-8% into by ore deposit weight and grade proportioning.
Described additive is Wingdale, and add-on is for to allocate 3-5% into by ore deposit weight proportion.
Described pelletizing is sent into preheater, and pelletizing size is 10-20mm, and it is 350 ~ 400 ℃ that preheating temperature is controlled, and be 0.5-1.5h warm up time; Preheating method: preheater utilizes the preheating of rotary kiln tail waste heat.
The described rotary kiln reduction that enters is calcined, 1250 ~ 1450 ℃ of kiln temperatures, and the recovery time is 1-2h.
Described pulverizing and jevigating after shrend, levigate after its shrend fragmentation is 2-3mm.
Described is levigate, levigate after, through 1.5mm hole sizer, divide, on sieve, screen underflow enters respectively jig, screen overflow enters and returns mill through the mine tailing of jigging, screen underflow enters magnetic separation through the mine tailing of jigging.
After jigging, finished product is that concentrate ferronickel grade is 15 ~ 20%, and the rate of recovery of nickel is more than 90%, quantity of slag 1.5-3%.
The advantage that the present invention has compared with the prior art and positively effect:
(1) in the present invention, red soil nickel ore and reductive agent and additive are mixed together to dry grinding, have improved mixing and the combination degree of storeroom, improved the reduction efficiency of red soil nickel ore.
(2) preheater is beneficial to kiln tail waste heat raw material is carried out to preheating, and residual heat resources are fully utilized.
(3) compare with other techniques, the present invention adopts respectively jig and magnetic separator to process kiln discharge product, and technique is brief, easy to operate, and the ferronickel rate of recovery is high.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, but the invention is not restricted to the following stated scope.
The method of coal-based direct reduction laterite nickel ore and producing ferronickel grain of the present invention, after laterite nickel raw ore is dried, allocates coal and other additives into and is mixed together dry grinding, then ball processed.After preheating, enter rotary kiln reduction calcining.Kiln discharge product is the material pulverizing and jevigating after shrend that partly melts state, then by entering jig after screening, by jigging sorting, can obtain ferronickel granule, and the mine tailing that goes out jig passes through magnetic separator recovery part magnetic valuable metal again.
After described red soil nickel ore is dried and coal dust and other additives be mixed together dry grinding: account for more than 90% to 200 orders.
Described coal dust add-on is for to allocate 3-8% into by ore deposit weight and grade proportioning.
Described additive is Wingdale, and add-on is for to allocate 3-5% into by ore deposit weight proportion.
Described pelletizing is sent into preheater, and it is 350 ~ 400 ℃ that preheating temperature is controlled, and be 0.5-1.5h warm up time, the tail waste heat preheating of preheater utilization cellar for storing things.
The described rotary kiln reduction that enters is calcined, 1250 ~ 1450 ℃ of kiln temperatures, and the recovery time is 1-2h.
Described pulverizing and jevigating after shrend, levigate after shrend fragmentation is 2-3mm.
Described through screening, levigately by 1.5mm sieve aperture, sieve; On sieve, screen underflow enters respectively jig; Screen overflow returns mill again through the mine tailing of jigging; Screen underflow enters magnetic separation through the mine tailing of jigging.
Described screen underflow enters magnetic separation separation through the mine tailing of jigging, the material after magnetic separation, and major ingredient is iron and a small amount of nickel, melts down material.
embodiment 1:
(1) raw ore: red soil nickel ore, its chemical composition: nickel 1.86%, iron 11.8%, magnesium oxide 24.7%, aluminium sesquioxide 0.9%, silicon-dioxide 42.5%, chromium sesquioxide 1.0%;
(2) processing step: laterite nickel raw ore is dried, allocate coal dust 5.5%, lime 3% into, be mixed together dry grinding to 200 orders and account for 90%, pressure ball, pelletizing size is 15mm, and pelletizing is sent into preheater, and preheating temperature is 350 ℃, time 1.2h.After preheating, pelletizing directly enters rotary kiln reduction calcining, controls 1250 ~ 1300 ℃ of kiln temperatures, time 1h, and the shrend immediately of kiln discharge material, pulverizing and jevigating to 2 ~ 3mm, can obtain Rhometal grain by entering jig after screening.Under these processing condition, Rhometal is nickeliferous 16.3%, nickel recovery 93.6%, iron recovery 91.8%.
embodiment 2:
(1) raw ore: red soil nickel ore, its chemical composition: nickel 1.7%, iron 12.0%, magnesium oxide 25.2%, aluminium sesquioxide 0.95%, silicon-dioxide 43.2%, chromium sesquioxide 0.8%;
(2) processing step: laterite nickel raw ore is dried, allocate coal dust 5%, lime 3.5% into, be mixed together dry grinding to 200 orders and account for 90%, pressure ball, pelletizing size is 15mm, and pelletizing is sent into preheater, and preheating temperature is 370 ℃, 50 minutes time.After preheating, pelletizing directly enters rotary kiln reduction calcining, controls 1300 ~ 1350 ℃ of kiln temperatures, time 1h, and the shrend immediately of kiln discharge material, pulverizing and jevigating to 2 ~ 3mm, can obtain Rhometal grain by entering jig after screening.Under these processing condition, Rhometal is nickeliferous 15.7%, nickel recovery 95.4%, iron recovery 92.3%.
embodiment 3:
(1) raw ore: red soil nickel ore, its chemical composition: nickel 1.86%, iron 11.8%, magnesium oxide 24.7%, aluminium sesquioxide 0.9%, silicon-dioxide 42.5%, chromium sesquioxide 1.0%; By weight percentage
(2) processing step: laterite nickel raw ore is dried, allocate coal dust 5.5%, lime 3% into, be mixed together dry grinding to 200 orders and account for 90%, pressure ball, pelletizing size is 15mm, and pelletizing is sent into preheater, and preheating temperature is 400 ℃, 50 minutes time.After preheating, pelletizing directly enters rotary kiln reduction calcining, controls 1300 ~ 1350 ℃ of kiln temperatures, time 1h, and the shrend immediately of kiln discharge material, pulverizing and jevigating to 2 ~ 3mm, can obtain Rhometal grain by entering jig after screening.Under these processing condition, Rhometal is nickeliferous 16.0%, nickel recovery 93%, iron recovery 93%.
Claims (9)
1. a method for coal-based direct reduction laterite nickel ore and producing ferronickel grain, is characterized in that containing following processing step:
After laterite nickel raw ore is dried, allocate coal dust and other additive into and be mixed together dry grinding, then pelletizing processed; After preheating, enter rotary kiln reduction calcining; Kiln discharge material pulverizing and jevigating after shrend, screening obtains ferronickel granule product by jigging separation, and the mine tailing part that goes out jig is isolated magnetic material by magnetic separator and is returned stove and recycle.
2. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: after red soil nickel ore is dried, allocate coal dust and other additives into and be mixed together dry grinding to 200 orders and account for 90%.
3. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: described coal dust add-on is for to allocate 3-8% into by ore deposit weight and grade proportioning.
4. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: described additive is Wingdale, and add-on is for to allocate 3-5% into by ore deposit weight proportion.
5. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: described pelletizing is sent into preheater, and pelletizing size is 10-20mm, and it is 350 ~ 400 ℃ that preheating temperature is controlled, and be 0.5-1.5h warm up time; Preheating method: preheater utilizes the preheating of rotary kiln tail waste heat.
6. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: the described rotary kiln reduction that enters is calcined, 1250 ~ 1450 ℃ of kiln temperatures, and the recovery time is 1-2h.
7. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: described pulverizing and jevigating after shrend, levigate after its shrend fragmentation is 2-3mm.
8. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, it is characterized in that: described is levigate, after levigate, through 1.5mm hole sizer, divide, on sieve, screen underflow enters respectively jig, screen overflow enters and returns mill through the mine tailing of jigging, and screen underflow enters magnetic separation through the mine tailing of jigging.
9. the method for a kind of coal-based direct reduction laterite nickel ore and producing ferronickel grain according to claim 1, is characterized in that: after jigging, finished product is that concentrate ferronickel grade is 15 ~ 20%, and the rate of recovery of nickel is more than 90%, quantity of slag 1.5-3%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410202576.6A CN104032058A (en) | 2014-05-14 | 2014-05-14 | Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore |
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| CN201410202576.6A CN104032058A (en) | 2014-05-14 | 2014-05-14 | Method for producing nickel-iron particles by using coal-based reducing agent to directly reduce laterite nickel ore |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105603214A (en) * | 2016-03-10 | 2016-05-25 | 朝阳力宝重工机械有限公司 | Method for producing ferronickel by directly reducing laterite-nickel ore in rotary kiln |
| CN108251659A (en) * | 2018-01-16 | 2018-07-06 | 中南大学 | A kind of method strengthened lateritic nickel ore direct-reduction technique and prepare ferronickel |
| CN113999991A (en) * | 2021-10-22 | 2022-02-01 | 金川镍钴研究设计院有限责任公司 | Method for producing high-nickel matte by smelting ferronickel from laterite-nickel ore and continuously vulcanizing and converting |
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| CN101323904A (en) * | 2008-07-28 | 2008-12-17 | 红河恒昊矿业股份有限公司 | Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln |
| 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 |
| CN101418388A (en) * | 2008-12-16 | 2009-04-29 | 毛耐文 | Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine |
| CN203403141U (en) * | 2013-08-16 | 2014-01-22 | 武汉建筑材料工业设计研究院有限公司 | Device for preparing ferronickel roasted ores by means of nickel laterite ores |
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2014
- 2014-05-14 CN CN201410202576.6A patent/CN104032058A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101323904A (en) * | 2008-07-28 | 2008-12-17 | 红河恒昊矿业股份有限公司 | Method for enriching nickel iron ore concentrate from laterite type nickel ore by means of rotary kiln |
| 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 |
| CN101418388A (en) * | 2008-12-16 | 2009-04-29 | 毛耐文 | Process for producing nickel iron in rotary kiln-blast furnace by using laterite nickle mine |
| CN203403141U (en) * | 2013-08-16 | 2014-01-22 | 武汉建筑材料工业设计研究院有限公司 | Device for preparing ferronickel roasted ores by means of nickel laterite ores |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105603214A (en) * | 2016-03-10 | 2016-05-25 | 朝阳力宝重工机械有限公司 | Method for producing ferronickel by directly reducing laterite-nickel ore in rotary kiln |
| CN108251659A (en) * | 2018-01-16 | 2018-07-06 | 中南大学 | A kind of method strengthened lateritic nickel ore direct-reduction technique and prepare ferronickel |
| CN113999991A (en) * | 2021-10-22 | 2022-02-01 | 金川镍钴研究设计院有限责任公司 | Method for producing high-nickel matte by smelting ferronickel from laterite-nickel ore and continuously vulcanizing and converting |
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