CN102146511A - Method for reclaiming nickel and iron in laterite nickel ore by selective reduction roasting - Google Patents
Method for reclaiming nickel and iron in laterite nickel ore by selective reduction roasting Download PDFInfo
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- CN102146511A CN102146511A CN 201110065374 CN201110065374A CN102146511A CN 102146511 A CN102146511 A CN 102146511A CN 201110065374 CN201110065374 CN 201110065374 CN 201110065374 A CN201110065374 A CN 201110065374A CN 102146511 A CN102146511 A CN 102146511A
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Abstract
The invention discloses a method for reclaiming nickel and iron in laterite nickel ore by selective reduction roasting, which comprises the following steps of: crushing a certain amount of silicate type laterite nickel ore into granularity of 10 millimeters, adding 10 to 20 percent of reducers and 5 to 15 percent of fluxing agents, then mixing the raw materials uniformly, adding the uniformly mixed raw materials into a muffle furnace, roasting the raw materials for 40 to 80 minutes at the temperature of between 1,100 and 1,150 DEG C, naturally cooling the ore, adding the cooled ore into a ball mill, and performing ore grinding to obtain ore slurry with 60 percent of mass concentration, 0.074 millimeter of grinding granularity, as well as accounting for 85 to 95 percent; and performing magnetic separation on the ore slurry under the condition that the magnetic field strength is 150 to 200kA/m to obtain nickel and iron metals, wherein the reclamation rate of the nickel is over 80 percent. The method has simple process flow and low investment cost, is energy-conservation and consumption-reduction, the nickel and the iron can be effectively reclaimed from the silicate type laterite nickel ore, the reclamation rate of the nickel is over 80 percent, the reclamation of the iron can be inhibited at the same time, and selective reduction of the nickel and the iron in the silicate type laterite nickel ore is realized.
Description
Technical field
The present invention relates to a kind of from the silicic acid type red soil nickel ore selective reduction roasting reclaim and to add fusing assistant in wherein nickel, the processing method of iron, particularly silicic acid type red soil nickel ore and be that reductive agent carries out selective reduction roasting-magnetic separation and reclaims nickel and suppress the iron process method with the coal.
Background technology
Because it is China is in industrialized mid-term stage,, also growing to the demand of nickel along with the process of China's Economic development is accelerated.Replace Japan since China in 2005 and become the country of nickel consumption maximum in the world.65% nickel is used to produce stainless steel, and supply falls short of demand along with stainless steel fast development has already caused world's nickel.Can be only limited to two kinds of the nickel sulfide ore on land and nickel oxide ores for the nickel resources of human development utilization at present, wherein about 30% be that sulphide ores, 70% is a red soil nickel ore.And the application that impels red soil nickel ore of petering out of nickel sulfide ore becomes extremely urgent.The laterite-type nickel ore aboundresources, it is low to reconnoitre cost, can have an opencast mining of, and mining cost is low.These advantages make the development and use of red soil nickel ore have wide development prospect more.The treatment process of red soil nickel ore mainly is divided into pyrogenic attack and wet processing two class technologies.Which kind of technology no matter, the recovering effect of the red soil nickel ore that nickel is mainly existed with silicic acid nickel form is all bad at present, and the rate of recovery of nickel is lower, and therefore, laterite silicic acid type ore deposit nickel minerals fails effectively to be developed always under the prior art condition.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of employing and add the direct reducing roasting of flux selection, reclaim nickel and iron in the silicic acid type red soil nickel ore, directly obtain a kind of nickel ferronickel product of high grade, reach the processing method that the selective reduction roasting of simplifying technical process, the cost of reducing investment outlay, energy saving purposes reclaims nickel and iron in the red soil nickel ore.
Technical scheme of the present invention is, the processing method of nickel and iron in a kind of selective reduction roasting recovery red soil nickel ore, it is reductive agent that this method adopts with the coal, add the direct reducing roasting of flux selection-magnetic separation process simultaneously and handle red soil nickel ore stone, make nickel and iron in the silicic acid type red soil nickel ore stone directly be reduced to metallic nickel and metallic iron.Can make iron and nickel enter into magnetic product through ore grinding, low intensity magnetic separation after the roasting, nickel and iron obtain reclaiming, and the nickel grade is the highest in the ferronickel product can reach more than 12%, and the rate of recovery of nickel is greater than 80%, and can control the rate of recovery of iron as required, guarantee the grade of nickel in the ferronickel product.
Specifically may further comprise the steps:
At first, it is-10mm that adding reductive agent and fusing assistant mix then, and be standby that a certain amount of silicic acid type red soil nickel ore stone is crushed to granularity; Wherein, the add-on of reductive agent is 5%～15% of a silicic acid type red soil nickel ore stone, and the add-on of fusing assistant is 10%～20% of a silicic acid type red soil nickel ore stone;
Then, the above-mentioned raw material that mixes is added in the retort furnace, in temperature is 1100 ℃～1150 ℃ following roastings 40～80 minutes, in joining ball mill, carry out ore grinding through behind the naturally cooling, obtain mass concentration 60%, grinding particle size accounts for 85～95% ore pulp for-0.074mm, and it is to carry out magnetic separation under 150～200kA/m condition that ore pulp is placed magneticstrength, the nickel that recovery is reduced, ferrous metal, the rate of recovery of nickel is more than 80%.
Described reductive agent is a coal.
Described fusing assistant is a yellow soda ash.
The invention has the beneficial effects as follows: utilize processing method of the present invention, can effectively reclaim nickel and iron from the silicic acid type red soil nickel ore, the rate of recovery of nickel can suppress the recovery of iron simultaneously more than 80%, the selective reduction of nickel and iron in the realization silicic acid type red soil nickel ore.Compare with existing method, the inventive method has following characteristics: the interior very difficult reduction in the general silicic acid type red soil nickel ore, so nickel is difficult to obtain the high rate of recovery.The rate of recovery of nickel can be more than 80% in the gained ferronickel product after employing present method.Simultaneously, present method can effectively suppress the reduction of iron in the red soil nickel ore, makes nickel, iron realize selective reduction.Processing method itself is simple than additive method, reclaims nickel inhibition iron and finishes synchronously, suppresses the reduction of iron when guaranteeing nickel recovery; What recovery nickel inhibition iron relied on synchronously is reductive agent and fusing assistant, and the kind of used reductive agent and fusing assistant is simple, and wide material sources, pollutant discharge amount are also few than additive method, are easy to handle; 4. having avoided the higher coke of use cost is reductive agent, and the low coal dust of use cost directly is a reductive agent, can save the cost of process of coking and to the pollution of environment; 5. can realize higher economic worth.From the economic benefit aspect, the price of the nickel pig iron is with the standard of nickel point as valuation, the nickel point is that the economic worth of the high more ferronickel of grade of nickel is high more, and this technology can realize higher economic benefit guaranteeing nickel recovery high-grade nickel ore concentrate of getting back simultaneously.
Description of drawings
Fig. 1 is the process flow sheet of the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore of the present invention.
Embodiment
Method provided by the invention is described in further detail with embodiment below in conjunction with accompanying drawing.
Embodiment 1
Choose a certain amount of silicic acid type red soil nickel ore stone, nickeliferous 1.43%, iron content 13.21%, wherein nickel is present in the silicate more than 60%; Adding mass percent is the fusing assistant consumption of 5% coal and 10%, adds behind the mixing in the retort furnace, at 1100 ℃ of following reducing roasting 40min; Cooling; Be milled to granularity-0.074mm in concentration 60% and account for 90%, in magneticstrength 198.73kA/m magnetic separation.Obtain nickel grade 7.61%, the ferronickel concentrate of nickel recovery 83.71%.
Embodiment 2
Raw material is that certain is nickeliferous 0.87%, the silicic acid type red soil nickel ore ore of iron content 26.84%, and nickel is present in more than 50% in the silicic acid nickel.The selective reduction roasting condition is: the consumption of reductive agent coal is 10%; The fusing assistant consumption is 15%; Behind the mixing in retort furnace 1150 ℃ of following reducing roasting 80min; Cooling; Be milled to granularity-0.076mm in concentration about 60% and account for 85%, in magneticstrength 200kA/m magnetic separation.Obtain nickel grade 3.65%, the ferronickel concentrate of the rate of recovery 97.96%.
Embodiment 3
Raw material is that certain is nickeliferous 1.58%, the silicic acid type red soil nickel ore ore of iron content 17.60%, and nickel is present in more than 70% in the silicic acid nickel.The selective reduction roasting condition is: the consumption of coal is 12%; The fusing assistant consumption is 18%; Behind the mixing in retort furnace 1125 ℃ of following reducing roasting 60min; Cooling; Be milled to granularity-0.076mm in concentration 60% and account for 95%, in magneticstrength 150kA/m magnetic separation.Obtain nickel grade 10.20%, iron grade 62.56%, the ferronickel product of nickel recovery 81.07%.
Claims (6)
1. a selective reduction roasting reclaims the processing method of nickel and iron in the red soil nickel ore, it is characterized in that: specifically may further comprise the steps:
At first, it is-10mm that adding reductive agent and fusing assistant mix then, and be standby that a certain amount of silicic acid type red soil nickel ore stone is crushed to granularity; Wherein, the add-on of reductive agent is 5%～15% of a silicic acid type red soil nickel ore stone, and the add-on of fusing assistant is 10%～20% of a silicic acid type red soil nickel ore stone;
Then, the above-mentioned raw material that mixes is added in the retort furnace, in temperature is 1100 ℃～1150 ℃ following roastings 40～80 minutes, in joining ball mill, carry out ore grinding through behind the naturally cooling, obtain mass concentration 60%, grinding particle size accounts for 85～95% ore pulp for-0.074mm, and it is to carry out magnetic separation under 150～200kA/m condition that ore pulp is placed magneticstrength, the nickel that recovery is reduced, ferrous metal, the rate of recovery of nickel is more than 80%.
2. the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore according to claim 1, it is characterized in that: described reductive agent is a coal.
3. the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore according to claim 1, it is characterized in that: described fusing assistant is a yellow soda ash.
4. the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore according to claim 1, it is characterized in that, the selective reduction roasting condition is: adding mass percent is the fusing assistant consumption of 5% coal and 10%, add in the retort furnace, behind the mixing at 1100 ℃ of following reducing roasting 40min; Cooling; Be milled to granularity-0.074mm in concentration 60% and account for 90%,, obtain nickel grade 7.61%, the ferronickel concentrate of nickel recovery 83.71% in magneticstrength 198.73kA/m magnetic separation.
5. the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore according to claim 1, it is characterized in that the selective reduction roasting condition is: the consumption of reductive agent coal is 10%; The fusing assistant consumption is 15%; Behind the mixing in retort furnace 1150 ℃ of following reducing roasting 80min; Cooling; Be milled to granularity-0.076mm in concentration about 60% and account for 85%,, obtain nickel grade 3.65%, the ferronickel concentrate of the rate of recovery 97.96% in magneticstrength 200kA/m magnetic separation.
6. the processing method of nickel and iron in the selective reduction roasting recovery red soil nickel ore according to claim 1, it is characterized in that the selective reduction roasting condition is: the consumption of coal is 12%; The consumption of yellow soda ash is 18%; Behind the mixing in retort furnace 1125 ℃ of following reducing roasting 60min; Cooling; Be milled to granularity-0.076mm in concentration 60% and account for 95%,, obtain nickel grade 10.20%, iron grade 62.56%, the ferronickel product of nickel recovery 81.07% in magneticstrength 150kA/m magnetic separation.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268503A (en) * | 2011-08-17 | 2011-12-07 | 北京科技大学 | Process method for producing directly reduced iron by using large-particle-size limonite and hematite |
| CN102643997A (en) * | 2012-04-09 | 2012-08-22 | 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 |
| CN104087753A (en) * | 2014-07-25 | 2014-10-08 | 北京科技大学 | Method for producing high-nickel-grade nickel-iron powder by laterite-nickel ore autocatalytic reduction |
| CN107022678A (en) * | 2017-06-20 | 2017-08-08 | 中南大学 | A kind of method that lateritic nickel ore selective reduction prepares ferronickel concentrate |
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| CN101338377A (en) * | 2008-08-27 | 2009-01-07 | 中南大学 | High-efficiency leaching process of nickel from laterite-nickel ore |
| CN101413053A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Additive for strengthening reduction and separation of laterite-nickel ore |
| CN101550021A (en) * | 2009-05-11 | 2009-10-07 | 大连理工大学 | Method for preparing light spume multi-hole bricks with fly ash |
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2011
- 2011-03-17 CN CN 201110065374 patent/CN102146511A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338377A (en) * | 2008-08-27 | 2009-01-07 | 中南大学 | High-efficiency leaching process of nickel from laterite-nickel ore |
| CN101413053A (en) * | 2008-12-09 | 2009-04-22 | 中南大学 | Additive for strengthening reduction and separation of laterite-nickel ore |
| CN101550021A (en) * | 2009-05-11 | 2009-10-07 | 大连理工大学 | Method for preparing light spume multi-hole bricks with fly ash |
Non-Patent Citations (2)
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| 《北京科技大学学报》 20100630 曹志成等 红土镍矿直接还原焙烧磁选回收铁镍 第708页第1.2节-第710页第2.4节、图1-3 1-6 第32卷, 第6期 * |
| 《北京科技大学学报》 20100630 曹志成等 红土镍矿直接还原焙烧磁选回收铁镍 第708页第1.2节-第710页第2.4节、图1-3 1-6 第32卷, 第6期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268503A (en) * | 2011-08-17 | 2011-12-07 | 北京科技大学 | Process method for producing directly reduced iron by using large-particle-size limonite and hematite |
| CN102643997A (en) * | 2012-04-09 | 2012-08-22 | 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 |
| 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 |
| CN104087753A (en) * | 2014-07-25 | 2014-10-08 | 北京科技大学 | Method for producing high-nickel-grade nickel-iron powder by laterite-nickel ore autocatalytic reduction |
| CN104087753B (en) * | 2014-07-25 | 2016-09-07 | 北京科技大学 | A kind of lateritic nickel ore self catalyzed reduction produces the method for nickelic grade ferronickel powder |
| CN107022678A (en) * | 2017-06-20 | 2017-08-08 | 中南大学 | A kind of method that lateritic nickel ore selective reduction prepares ferronickel concentrate |
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Application publication date: 20110810 |