CN103468928B - A kind of enriching method of manganese oxide ore - Google Patents
A kind of enriching method of manganese oxide ore Download PDFInfo
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- CN103468928B CN103468928B CN201310441428.5A CN201310441428A CN103468928B CN 103468928 B CN103468928 B CN 103468928B CN 201310441428 A CN201310441428 A CN 201310441428A CN 103468928 B CN103468928 B CN 103468928B
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Abstract
The invention provides a kind of enriching method of manganese oxide ore, comprise the following steps: by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product; By described first product and reductive agent baking mixed, obtain calcining; After described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 119.43 ~ 159.24kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate.Experimental result shows, adopts processing method of the present invention, and can obtain the manganese oxide concentrate that manganese grade is greater than 28%, manganese recovery ratio is greater than 88%; Iron grade higher than 50% iron ore concentrate, iron recovery is greater than 40%.
Description
Technical field
The invention belongs to manganese oxide ore and develop field, particularly a kind of enriching method of manganese oxide ore.
Background technology
Manganese ore is a kind of important Mineral resources, and the standing stock of China's manganese ore occupy the 6th, the world, but 5% of the identified resource reserve Jin Zhan world.The manganese ore of China is second-rate, and poor manganese ore reserves proportion is higher.
Manganese ore is mainly divided into manganese carbonate ore and the large class of manganese oxide ore two.Manganese oxide ore is based on multiple manganese mineral, and normal association has the compositions such as gangue, iron, phosphorus, nickel and cobalt.The manganese oxide ore that manganese grade is greater than 28% may be used for preparing the raw material of manganous sulfate and electrolytic manganese, but this kind of manganese ore of China is fewer and feweri, can not meet industrial needs far away.On the contrary, a large amount of manganese grade lower than 22% manganese ore can not get effective utilization.Therefore, how effectively to utilize Low grade manganese ore to be the important subject of domestic and international manganese secondary industry always.
At present, mechanical beneficiation method is mainly adopted for Low grade manganese ore.For the weathering type manganese oxide ore containing a large amount of sludge and fine ore, production adopts washup-reselecting method.Raw ore removes sludge through washup, the clean ore deposit of gained, and what have can as finished product ore, and needing of having is selected with jigging and shaking table etc. again.
Because the grade of China's poor manganese ore is lower, manganese oxide ore granularity is tiny, so the effect of above-mentioned mechanical beneficiation is not satisfactory, even the ore selected for phase commute, the manganese grade of concentrate does not reach 28% yet.And the method for above-mentioned mechanical beneficiation is not easy the iron in ore to be separated with manganese, even if after separating, Iron grade is also lower, is not easy to be reused.
Summary of the invention
The present invention solve technical problem be the enriching method that a kind of manganese oxide ore is provided, not only can obtain manganese grade higher than 28% manganic concerntrate, can also obtain Iron grade higher than 50% iron ore concentrate.
The invention discloses a kind of enriching method of manganese oxide ore, comprise the following steps:
(A) by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product;
(B) by described first product and reductive agent baking mixed, obtain calcining;
(C) by after described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 119.43 ~ 159.24kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate.
Preferably, in described step (A), the rough Fe content of described manganese oxide is greater than 18%, and iron level is higher than 13%.
Preferably, in described step (A), the rough granularity of described manganese oxide is less than 8mm.
Preferably, in described step (A), described manganese oxide is rough to be obtained through washup by manganese oxide raw ore.
Preferably, in described step (A), described magneticstrength is 930 ~ 960kA/m.
Preferably, in described step (B), described reductive agent is coal dust or powdered carbon.
Preferably, in described step (B), the quality of described first product and reductive agent is 1: 0.1 ~ 0.14.
Preferably, in described step (C), described maturing temperature is 900 ~ 1000 DEG C.
Preferably, in described step (C), described roasting time is 50 ~ 90 minutes.
Preferably, in described step (C), after described calcining grinding, particle diameter is that the particle being less than 0.074mm accounts for more than 80wt%.
Compared with prior art, the enriching method of manganese oxide ore of the present invention, comprises the following steps: by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product; By described first product and reductive agent baking mixed, obtain calcining; After described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 119.43 ~ 159.24kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate.
In the present invention, first high magnetic pre-selection eliminate manganese oxide rough in gangue, improve the manganese grade in the first product, and reduce the treatment capacity of follow-up roasting and grinding.The first product obtained, without the need to broken and grinding, can directly carry out roasting after mix with reductive agent, and through roasting, value Mn is reduced to the MnO of low price, and MnO is more convenient for subsequent applications.Eventually pass low intensity magnetic separation, the manganese in calcining is separated with iron, not only obtains high-grade manganic concerntrate, high-grade iron ore concentrate can also be obtained.Experimental result shows, the manganese grade of the manganese oxide concentrate that the present invention obtains is greater than 28%, and the Iron grade of iron ore concentrate is greater than 50%.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The embodiment of the invention discloses a kind of enriching method of manganese oxide ore, comprise the following steps:
(A) by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product;
(B) by described first product and reductive agent baking mixed, obtain calcining;
(C) by after described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 119.43 ~ 159.24kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate.
The present invention is the method for Low grade manganese ore being carried out to enrichment process, to improve manganese product grade for main purpose, obtains high-grade iron ore concentrate simultaneously.
According to the present invention, rough for raw material with manganese oxide, described manganese oxide is rough can be the raw ore of manganese oxide, is preferably obtained through washup by manganese oxide raw ore.The present invention is not particularly limited for the method for washup, according to method well known to those skilled in the art.The rough preferred Fe content of described manganese oxide is greater than 18%, and iron level is higher than 13%.
According to the present invention, first by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product.The non-magnetic substances such as gangue can be removed by the magnetic field of described intensity, obtain the first product containing magnetic substance.High magnetic pre-selection not only increases the manganese grade of the first product, and reduces the treatment capacity of follow-up roasting and grinding.Described high magnetic pre-selection does not also need fragmentation, simple to operate, and industrial being easy to realizes.That carries out to make high magnetic pre-selection is relatively complete, and preferably, the rough granularity of described manganese oxide is less than 8mm; Preferred, the granularity of described manganese oxide is 2 ~ 6mm.Described high magnetic pre-selection can be the preliminary election of wholegrain level, also can be classification preliminary election.When carrying out high magnetic pre-selection, the intensity in described magnetic field is 900 ~ 1000kA/m, is preferably 930 ~ 960kA/m.The present invention controls the degree of high magnetic pre-selection by the manganese recovery ratio controlling mine tailing productive rate and the loss abandoned, and preferably, abandoning mine tailing productive rate is 16% ~ 20%, and the manganese recovery ratio of loss is less than 7% and namely completes high magnetic pre-selection, and gained first product can carry out roasting.
After obtaining the first product, by described first product and reductive agent baking mixed, obtain calcining.Described reductive agent is preferably coal dust or the better powdered carbon of purity.The object of roasting is that the MnO be reduced to by the value Mn in the first product at a low price, described MnO are more convenient for subsequent applications.The quality optimization of described first product and reductive agent is 1: 0.1 ~ 0.14, is more preferably 1: 0.11 ~ 0.13.The temperature of described roasting is preferably 900 ~ 1000 DEG C, is more preferably 940 ~ 970 DEG C, most preferably is 950 ~ 960 DEG C.The time of described roasting is preferably 50 ~ 90 minutes, is more preferably 60 ~ 80 minutes, most preferably is 65 ~ 75 minutes.
After obtaining calcining, after described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 119.43 ~ 159.24kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate.In order to make manganese oxide in calcining and Armco magnetic iron Component seperation, preferably, after described calcining grinding, particle diameter is that the particle being less than 0.074mm accounts for more than 80%, and more preferably particle diameter is that the particle being less than 0.074mm accounts for more than 85%.Described magneticstrength is 119.43 ~ 159.24kA/m, is preferably 125 ~ 140kA/m.Manganese oxide concentrate and iron ore concentrate can be obtained through low intensity magnetic separation.
Experimental result shows, the manganese grade of the manganese oxide concentrate obtained is greater than 28%, and the Iron grade of iron ore concentrate is greater than 50%.
In ore enrichment field, although the steps such as washup, gravity treatment, magnetic separation belong to usual procedure, be through the combination of different step, its inrichment for ore but varies.
The present invention is successively through high intensity magnetic separation-roasting-low intensity magnetic separation three step, and described three step actings in conjunction, obtain the manganese oxide concentrate that manganese grade is greater than 28%, by product is the iron ore concentrate that Iron grade is greater than 50%, and concentration effect is splendid.
In order to understand the present invention further, be described below in conjunction with the enriching method of embodiment to a kind of manganese oxide ore provided by the invention, protection scope of the present invention is not limited by the following examples.
For the Low grade manganese ore of Hunan collection, the invention will be further described below, but the present invention is not limited to this embodiment, and this technique is all applicable to kin ore.
The raw ore chemical composition analysis of Hunan manganese oxide ore is as shown in table 1.
Table 1 Hunan manganese oxide ore principal element composition
| Element | Mn | Fe | Cu | Pb | Zn | TiO 2 | SiO 2 | Al 2O 3 |
| Content/% | 18.78 | 13.67 | 0.045 | 0.037 | 0.075 | 0.48 | 27.92 | 11.05 |
| Element | CaO | MgO | Na 2O | K 2O | P | S | Ig | |
| Content/% | 0.12 | 0.19 | 0.068 | 0.69 | 0.15 | 0.025 | 13.78 |
Embodiment 1
Get the rough 10kg of the manganese oxide after washup, carry out wholegrain level high magnetic pre-selection, magneticstrength is 955.41kA/m, the first products collection efficiency 81.84%, manganese grade 21.28%, and manganese recovery ratio is 93.36%; Mine tailing productive rate 18.16%, manganese grade 6.82%.High magnetic pre-selection gained manganese rough concentrate (-8mm) is mixed in mass ratio with coal dust (-1mm) at 1: 0.11; Loaded in reactor by both mixtures and add thermal bake-out, maturing temperature 950 DEG C, roasting time is 70min.Roasting material is put into ball mill, and ore grinding to-0.074mm grade accounts for 80wt%.Again the material of milled is carried out low intensity magnetic separation, magneticstrength is 159.24kA/m, obtains the manganic concerntrate containing manganese 28.11%, manganese recovery ratio 88.08%; The iron ore concentrate of iron content 52.43%, iron recovery 41.56%.
Embodiment 2:
Get the rough 10kg of the manganese oxide after washup, through being divided into-8+5.5mm ,-5.5+3.3mm,-3.3mm three grade products, carry out high magnetic pre-selection respectively to each grade product, and magneticstrength is 955.41kA/m, first products collection efficiency 83.08%, manganese grade 21.25%, manganese recovery ratio is 94.48%; Mine tailing productive rate 16.92%, manganese grade 6.10%.Each for high magnetic pre-selection gained grade manganese rough concentrate (-8mm) is mixed in mass ratio with coal dust (-1mm) at 1: 0.11; Loaded in reactor by both mixtures and add thermal bake-out, maturing temperature 950 DEG C, roasting time is 70min.Roasting material is put into ball mill, and ore grinding to-0.074mm grade accounts for 85wt%.Again the material of milled is carried out low intensity magnetic separation, magneticstrength is 159.24kA/m, the manganese grade 28.62% of the manganic concerntrate of acquisition, manganese recovery ratio 89.72%.
Embodiment 3
Get the rough 10kg of the manganese oxide after washup, the rough granularity of manganese oxide is less than 8mm, and carry out high magnetic pre-selection, magneticstrength is 960kA/m, the first products collection efficiency 82.53%, manganese grade 21.20%, and manganese recovery ratio is 93.79%; Mine tailing productive rate 16.05%, manganese grade 6.11%.Each for high magnetic pre-selection gained grade manganese rough concentrate (-8mm) is mixed in mass ratio with coal dust (-1mm) at 1: 0.13; Loaded in reactor by both mixtures and add thermal bake-out, maturing temperature 955 DEG C, roasting time is 65min.Roasting material is put into ball mill, and ore grinding to-0.074mm grade accounts for 85wt%.Again the material of milled is carried out low intensity magnetic separation, magneticstrength is 165.24kA/m, the manganese grade 29.02% of the manganic concerntrate of acquisition, manganese recovery ratio 89.68%.
Comparative example 1
Get the rough 10kg of the manganese oxide after washup, the rough granularity of manganese oxide is less than 8mm, and carry out high magnetic pre-selection, magneticstrength is 960kA/m, obtains the first product.High magnetic pre-selection gained first product (-8mm) is mixed in mass ratio with coal dust (-1mm) at 1: 0.13; Loaded in reactor by both mixtures and add thermal bake-out, maturing temperature 955 DEG C, roasting time is 65min.Carry out gravity treatment after roasting, manganese cannot be made to be separated with iron.
Comparative example 2
-2mm is crushed to by rough for the manganese oxide after washup, roasting is carried out under maturing temperature 950 DEG C, roasting time 70min, coal proportioning 15% condition, calcining is milled to after-0.074mm accounts for 80wt% and carries out weak magnetic-high-intensity magnetic separation, and obtain the manganic concerntrate that manganese grade is 25.87%, manganese recovery ratio is 75.70%.
Comparative example 3
Be crushed to-2mm by rough for the manganese oxide of-8mm, and then account for 70wt% with grinding of ball grinder to-0.074mm, adopt high intensity magnetic separation to sort.When magneticstrength is 1.5T, obtain the manganic concerntrate that manganese grade is 23%, manganese recovery ratio is 22%.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. manganese grade is lower than the enriching method of Low grade manganese ore of 22%, is specially following steps:
(A) by rough for manganese oxide be carry out high magnetic pre-selection in the magnetic field of 900 ~ 1000kA/m in magneticstrength, obtain the first product; The rough granularity of described manganese oxide is less than 8mm;
(B) by described first product and reductive agent baking mixed, obtain calcining; Described reductive agent is coal dust;
(C) by after described calcining grinding, be carry out low intensity magnetic separation in the magnetic field of 125 ~ 140kA/m in magneticstrength, obtain manganese oxide concentrate and iron ore concentrate;
The mass ratio of described first product and reductive agent is 1: 0.1 ~ 0.14, and the temperature of described roasting is 900 ~ 1000 DEG C.
2. enriching method according to claim 1, is characterized in that, in described step (A), the rough Fe content of described manganese oxide is greater than 18%, and iron level is higher than 13%.
3. enriching method according to claim 1, is characterized in that, in described step (A), described manganese oxide is rough to be obtained through washup by manganese oxide raw ore.
4. enriching method according to claim 1, is characterized in that, in described step (A), described magneticstrength is 930 ~ 960kA/m.
5. enriching method according to claim 1, is characterized in that, in described step (C), described roasting time is 50 ~ 90 minutes.
6. enriching method according to claim 1, is characterized in that, in described step (C), after described calcining grinding, particle diameter is that the particle being less than 0.074mm accounts for more than 80wt%.
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