CN112791848A - Method for reducing ilmenite flotation difficulty in process of recycling ilmenite from iron ore dressing tailings - Google Patents
Method for reducing ilmenite flotation difficulty in process of recycling ilmenite from iron ore dressing tailings Download PDFInfo
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Abstract
The invention provides a method for reducing ilmenite flotation difficulty in a process of recovering ilmenite from vanadium titano-magnetite iron-dressing tailings. The method comprises the steps of desliming and concentrating the flotation tailings, feeding the flotation tailings into a gravity separation process, carrying out gravity separation and recovery on coarse ilmenite or intergrowth of the coarse ilmenite and olivine which is difficult to float and enter a titanium concentrate foam product, so that the negative influence of the olivine or the pyroxene on flotation in the ilmenite recovery process is reduced, the ilmenite flotation difficulty is reduced, and the recovery cost is reduced; the recovery rate of titanium is improved, and conditions are created for reducing the dosage of the medicament in the flotation process. When the total recovery rate of the titanium concentrate is the same, the content of titanium dioxide in the flotation titanium concentrate is improved by 0.5 percent and reaches 47.5 percent; when the grade of the flotation titanium concentrate also reaches 47 percent of titanium dioxide, the total recovery rate of the titanium concentrate is improved by 5 percent.
Description
Technical Field
The invention belongs to a titanium separation process of vanadium titano-magnetite, and particularly relates to a method for reducing the difficulty of ilmenite flotation in the process of recovering ilmenite from iron separation tailings.
Background
The vanadium-titanium magnetite ore can be classified into six types of natural type, pyroxene type, olivine type, and pyroxene type. In the field of mineral processing (mineral processing) for recovering ilmenite from vanadium titano-magnetite iron separation tailings, methods such as weak magnetic separation, strong magnetic separation, gravity separation, flotation, electric separation and the like are widely used.
At present, the principle flow of firstly selecting iron and then selecting titanium is generally adopted for the dressing of vanadium titano-magnetite in Panxi province, wherein the iron selection generally adopts a multi-stage grinding step dressing flow such as two-stage, three-stage and even four-stage, and the flotation in the titanium selection flow of the iron tailings containing olivine or pyroxene is influenced by interfering minerals such as olivine, chlorite, pyroxene and the like with similar magnetism with ilmenite, so that the flotation difficulty is very high, the medicament consumption is high, the recovery rate is low, the concentrate grade is not well controlled, and the cost is high.
Disclosure of Invention
In view of the above, the invention aims to provide a method for reducing ilmenite flotation difficulty in the process of recovering ilmenite from iron ore dressing tailings, which can reduce ilmenite flotation difficulty and has a higher titanium recovery material.
The invention provides a method for reducing ilmenite flotation difficulty in a process of recovering ilmenite from vanadium titano-magnetite iron-dressing tailings, which comprises the following steps:
pretreating iron ore tailings of the vanadium titano-magnetite to obtain reselected raw ore;
carrying out reselection process operation on the reselected raw ore to obtain reselected concentrate;
grinding and grading the gravity concentrate to obtain oversize products and undersize products;
strongly magnetizing the undersize product to obtain strong magnetic tailings and flotation raw ore;
under an acidic condition, adopting a collecting agent to float the flotation raw ore to obtain flotation titanium concentrate and flotation tailings;
desliming and concentrating the flotation tailings to obtain fine-grained products and coarse-grained products;
and returning the coarse grain product to the scavenging operation in the gravity separation process for feeding, and circularly performing the steps of gravity separation, ore grinding and classification, strong magnetism, flotation, desliming and concentration.
The classification granularity limit of desliming concentration is 0.063 mm-0.1 mm.
Preferably, the oversize is mixed with reselected raw ore, and the reselecting and grinding classification steps are circularly carried out.
Preferably, the-0.074 mm size fraction content of the coarse product is less than or equal to 30 wt%.
Preferably, the reselection process operation comprises 1 roughing, 1 concentrating and 1-2 scavenging.
Preferably, the TiO in the reselected raw ore2The content of TiO in the concentrate is 5-13 percent by gravity concentration2The content of the TiO is 12-21%, and the TiO in the tailings is reselected2The content is 1-3%.
According to the method provided by the invention, the flotation tailings are subjected to desliming and concentration and then fed into a reselection process, coarse ilmenite or intergrowth of coarse ilmenite and olivine pyroxene which is difficult to float and enter a titanium concentrate foam product is recovered by reselection, so that the negative influence of olivine or pyroxene on flotation in the ilmenite recovery process is reduced, the ilmenite flotation difficulty is reduced, and the recovery cost is reduced; the recovery rate of titanium is improved, and conditions are created for reducing the dosage of the medicament in the flotation process. The experimental results show that: when the total recovery rate of the titanium concentrate is the same, the content of titanium dioxide in the flotation titanium concentrate is improved by 0.5 percent and reaches 47.5 percent; when the grade of the flotation titanium concentrate also reaches 47 percent of titanium dioxide, the total recovery rate of the titanium concentrate is improved by 5 percent.
Drawings
FIG. 1 is a process flow chart for reducing ilmenite flotation difficulty in the process of recovering ilmenite from vanadium titano-magnetite iron-dressing tailings provided by the invention.
Detailed Description
The invention provides a method for reducing ilmenite flotation difficulty in a process of recovering ilmenite from vanadium titano-magnetite iron-dressing tailings, which comprises the following steps:
pretreating iron ore tailings of the vanadium titano-magnetite to obtain reselected raw ore;
reselecting the reselected raw ore to obtain reselected concentrate and reselected tailings;
grinding and grading the gravity concentrate to obtain oversize products and undersize products;
strongly magnetizing the undersize product to obtain strong magnetic tailings and flotation raw ore;
under an acidic condition, adopting a collecting agent to float the flotation raw ore to obtain flotation titanium concentrate and flotation tailings;
desliming and concentrating the flotation tailings to obtain fine-grained products and coarse-grained products;
and returning the coarse grain product to the scavenging operation in the gravity separation process for feeding, and circularly performing the steps of gravity separation, ore grinding and classification, strong magnetism, flotation, desliming and concentration.
According to the method provided by the invention, the flotation tailings are subjected to desliming and concentration and then fed into a reselection process, coarse ilmenite or intergrowth of coarse ilmenite and olivine pyroxene which is difficult to float and enter a titanium concentrate foam product is recovered by reselection, so that the negative influence of olivine or pyroxene on flotation in the ilmenite recovery process is reduced, the ilmenite flotation difficulty is reduced, and the recovery cost is reduced; the recovery rate of titanium is improved, and conditions are created for reducing the dosage of the medicament in the flotation process.
The invention pretreats the iron tailings of the vanadium titano-magnetite to obtain the reselected raw ore. In the invention, the iron tailings of the vanadium titano-magnetite are the iron tailings of the vanadium titano-magnetite containing olivine or pyroxene; the target mineral in the tailings of the iron separation of the vanadium titano-magnetite is ilmenite, and the gangue mainly comprises olivine, pyroxene, plagioclase feldspar and the like. The pretreatment comprises the steps of coarse separation, concentration desliming and grading, removal of strong magnetic minerals through weak magnetic operation and the like.
After the gravity-separated raw ore is obtained, the gravity-separated raw ore is subjected to gravity separation process operation to obtain gravity-separated concentrate and gravity-separated tailings. Experimental conditions for the reselection: the gravity concentration of ore feeding is 20-40%, the gravity flow operation comprises 1 roughing, 1 concentrating and 1-2 scavenging, wherein 1 scavenging concentrate can be ground so as to increase the gravity effect. TiO in the gravity concentration raw ore2The content of TiO in the concentrate is 5-13 percent by gravity concentration2The content of the TiO is 12-21%, and the TiO in the tailings is reselected2The content is 1-3%.
After gravity concentrate is obtained, the gravity concentrate is ground and classified to obtain oversize products and undersize products. The grinding classification equipment comprises a grinding machine, a cyclone and a high-frequency fine screen; the sieve pores of the high-frequency fine sieve are 0.1-0.18 mm. The invention preferably mixes oversize materials with reselected raw ores, and circularly performs reselecting and grinding grading steps.
The undersize product is strongly magnetized to obtain the strongly magnetized tailings and the flotation raw ore. The concentration of the strong magnetic feeding ore is 20-40%, and the field intensity is 0.6T-1.0T. The flotation raw ore mainly comprises the following components of target minerals, namely ilmenite accounting for 20-40% of the total dry weight of the flotation raw ore, and gangue mainly comprising olivine, pyroxene, plagioclase feldspar and the like.
Under an acidic condition, the flotation raw ore is floated by adopting the collecting agent to obtain flotation titanium concentrate and flotation tailings. The type of the collecting agent is a commercial MOH or a titanium floating collecting agent. The weight concentration of the flotation raw ore is 45-55%, and the recovery rate is 70-85%.
The main agent of metal loss in the flotation tailings is in a grade of +0.074mm, which is characterized in that the content of titanium dioxide in the grade is higher, and the content of ilmenite or an intergrowth of ilmenite and olivine or pyroxene in the flotation tailings which are difficult to float and recover is higher.
After flotation tailings are obtained, desliming and concentrating the flotation tailings to obtain fine-grained products and coarse-grained products; and returning the coarse grain product to the scavenging operation in the gravity separation process for feeding, and circularly performing the steps of gravity separation, ore grinding and classification, strong magnetism, flotation, desliming and concentration. The flotation tailings are subjected to desliming and grading to reselect the obtained coarse grain product, the reselection advantage is played, a large amount of olivine or pyroxene is thrown into the reselection tailings, the degradation of reselection caused by fine fractions of the flotation tailings is avoided, the obtained reselection concentrate is subjected to grinding and grading and strong magnetic separation and then fed into flotation to recover ilmenite through flotation, the flotation difficulty can be reduced, and efficient recovery is achieved.
In the present invention, the classification particle size limit of the desliming concentration is 0.063mm to 0.1mm, more preferably 0.063mm to 0.075 mm. The content of-0.074 mm size fraction in the coarse grain product is less than or equal to 30 wt%.
The invention utilizes the close combination of gravity separation and flotation to throw out the interfering minerals such as olivine or pyroxene as much as possible, thereby reducing the subsequent flotation difficulty, improving the recovery rate and creating conditions for reducing the dosage of the medicament for the flotation. The process can be used for efficiently recovering titanium resources of the vanadium titano-magnetite containing olivine or pyroxene, and has obvious economic and social benefits.
For further illustration of the present invention, the method for reducing the difficulty of ilmenite flotation in the process of recovering ilmenite from vanadium titano-magnetite iron tailings provided by the present invention is described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The flow shown in fig. 1 is adopted:
pretreating iron ore tailings containing olivine or pyroxene vanadium titano-magnetite, wherein the pretreatment comprises the steps of coarse separation, concentration desliming and grading, removal of strong magnetic minerals through weak magnetic operation and the like to obtain reselected raw ore;
reselecting the reselected raw ore to obtain reselected concentrate and reselected tailings; gravity separation of TiO in raw ore2Content of 5-13%, gravity concentration of TiO concentrate2The content of the tailings is 12-21%, and TiO is reselected2The content is 1-3%.
Grinding and grading the gravity concentrate to obtain oversize products and undersize products; the undersize comprises the following main components: the target mineral is ilmenite, and the gangue mainly comprises olivine, pyroxene, plagioclase and the like.
Strongly magnetizing the undersize product to obtain strong magnetic tailings and flotation raw ore; the strong magnetic feeding concentration is 20-40%, and the field intensity is 0.6T-1.0T.
Under an acidic condition, adopting a collecting agent to float the flotation raw ore to obtain flotation titanium concentrate and flotation tailings; the type of the fatty acid collecting agent is a commercially available MOH or titanium flotation collecting agent; the weight concentration of the flotation raw ore is 45-55%, and the recovery rate is 70-85%.
Desliming and concentrating the flotation tailings to obtain fine-grained products and coarse-grained products; returning the coarse grain product to scavenging operation in the gravity flow for feeding, and circularly performing gravity separation, ore grinding and classification, strong magnetism, flotation, desliming and concentration; the classification granularity of desliming concentration is 0.063 mm-0.075 mm.
Compared with the treatment of the subsequent flow such as the scavenging operation ore feeding and the like in the gravity flow, the content of the titanium dioxide in the titanium concentrate obtained by flotation is improved by 0.5 percent and reaches 47.5 percent; when the grade of the flotation titanium concentrate also reaches 47 percent of titanium dioxide, the total recovery rate of the titanium concentrate is improved by 5 percent.
According to the embodiment, the flotation tailings are subjected to desliming and concentration and then fed into the reselection process, coarse ilmenite or intergrowth of coarse ilmenite and olivine which is difficult to float and enter the titanium concentrate foam product is recovered by reselection, so that the negative influence of olivine or pyroxene on flotation in the ilmenite recovery process is reduced, the ilmenite flotation difficulty is reduced, and the recovery cost is reduced; the recovery rate of titanium is improved, and conditions are created for reducing the dosage of the medicament in the flotation process.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A method for reducing ilmenite flotation difficulty in the process of recovering ilmenite from vanadium titano-magnetite iron-dressing tailings comprises the following steps:
pretreating iron ore tailings of the vanadium titano-magnetite to obtain reselected raw ore;
performing reselection flow operation on the reselected raw ore to obtain reselected concentrate and reselected tailings;
grinding and grading the gravity concentrate to obtain oversize products and undersize products;
strongly magnetizing the undersize product to obtain strong magnetic tailings and flotation raw ore;
under an acidic condition, adopting a collecting agent to float the flotation raw ore to obtain flotation titanium concentrate and flotation tailings;
desliming and concentrating the flotation tailings to obtain fine-grained products and coarse-grained products;
and returning the coarse grain product to the scavenging operation in the gravity separation process for feeding, and circularly performing the steps of gravity separation, ore grinding and classification, strong magnetism, flotation, desliming and concentration.
2. The method according to claim 1, characterized in that the desliming concentration has a classification particle size limit of 0.063mm to 0.1 mm.
3. The method of claim 1, wherein the oversize is mixed with gravity feed, and the gravity and grinding classification steps are cycled.
4. The process of claim 1, wherein the coarse product has a-0.074 mm size fraction of 30 wt% or less.
5. The method of claim 1, wherein the reselection process comprises 1 rougher, 1 cleaner and 1-2 sweeps.
6. The method of claim 1, wherein the reselecting TiO in raw ore2The content of TiO in the concentrate is 5-13 percent by gravity concentration2The content of the TiO is 12-21%, and the TiO in the tailings is reselected2The content is 1-3%.
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Cited By (2)
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| CN113713964A (en) * | 2021-07-29 | 2021-11-30 | 四川谨而睿科技有限公司 | Method for recovering titanium concentrate from hypo-iron ore in titanomagnetite recovery process |
| CN113953081A (en) * | 2021-09-29 | 2022-01-21 | 河钢承德钒钛新材料有限公司 | Beneficiation method for high-grade titanium concentrate |
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