CN110586335A - High-alkali magnetic-first-floating-later-magnetic pyrite beneficiation method - Google Patents
High-alkali magnetic-first-floating-later-magnetic pyrite beneficiation method Download PDFInfo
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- CN110586335A CN110586335A CN201910805537.8A CN201910805537A CN110586335A CN 110586335 A CN110586335 A CN 110586335A CN 201910805537 A CN201910805537 A CN 201910805537A CN 110586335 A CN110586335 A CN 110586335A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/02—Froth-flotation processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/082—Subsequent treatment of concentrated product of the froth product, e.g. washing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/08—Subsequent treatment of concentrated product
- B03D1/087—Subsequent treatment of concentrated product of the sediment, e.g. regrinding
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Abstract
The invention belongs to the technical field of metal mineral resource development, and particularly relates to a beneficiation method for pyrrhotite-containing ore, which comprises the following steps: carrying out a copper flotation roughing process on the magnetite-containing ore, carrying out a copper flotation scavenging process on the tailings obtained by the copper flotation roughing process, carrying out a magnetic separation process on the tailings obtained by the copper flotation scavenging process, carrying out a sulfur flotation roughing process on the tailings obtained by the magnetic separation process, carrying out a sulfur flotation scavenging process on the tailings obtained by the sulfur flotation roughing process, and carrying out a secondary desulfurization process on the concentrate obtained by the magnetic separation process to obtain iron concentrate. The invention is especially suitable for the pyrrhotite containing low copper and high sulfur iron, the process adopts high alkali to carry out magnetic flotation firstly and then to carry out flotation, and valuable metals including metal objects such as copper, iron, sulfur, pyrrhotite and the like in the copper-iron ore can be comprehensively recovered.
Description
Technical Field
The invention relates to the fields of chemical industry and metallurgy, in particular to a mineral separation process for mixed ores of chalcopyrite, pyrite, magnetite and pyrrhotite.
Background
The new bridge copper-pyrite deposit is a very important deposit in the region of the copurry deposit in the middle and lower reaches of Yangtze river in China, and the deposit is rich in sulfur reserves, mainly contains ores such as chalcopyrite, pyrite, magnetite, pyrrhotite and the like, and also contains a small part of ores such as galena, sphalerite and the like. The similar mineral deposits exist in more mines in China, typically in the industries of Tongling wax gourd hilly copper mine, Anhui Anqing copper mine, Tongling purple gold mine and the like.
The mining and dressing capacity of the new bridge mine is 150 million tons/year, wherein 60 million tons of underground mine and 90 million tons of open-pit mine become large-scale polymetallic mines with 140 million tons of annual sulfur concentrate, 4 million tons of copper concentrate and 10 million tons of iron ore. After years of production practice, the process flow is smooth, and the production index is good. But also has some problems, one is influenced by market conditions, and the low-sulfur concentrate containing about 40 percent of sulfur has great difficulty in selling and low price. Secondly, the sulfur content of the iron ore concentrate is seriously exceeded, the sulfur content of the general iron ore concentrate is more than 3-4%, sometimes even more than 10%, and the iron recovery rate is not high.
At present, few documents are reported on the beneficiation process of the pyrrhotite-containing copper pyrite, and a single beneficiation process or a beneficiation process combined with magnetic separation is mainly adopted. Zhao Guanfei et al recovers high-sulfur ferro-copper ore in Anhui province, but the iron ore concentrate has high sulfur content and is difficult to be comprehensively utilized.
Disclosure of Invention
Technical problem to be solved
The invention is especially provided for improving the separation efficiency of copper, sulfur and iron valuable metal iron in the copper-sulfur-iron ore and gangue such as quartz, garnet and the like.
(II) technical scheme
In order to achieve the purpose of the invention, the technical scheme provided by the invention is as follows: a beneficiation method for pyrrhotite-containing ore is characterized in that: the method comprises the following steps:
carrying out copper flotation roughing process on the magnetic pyrite, wherein the collecting agent uses butyl xanthate, and the using amount is as follows: 50-70 g/t; the foaming agent is No. 2 oil: 15-25 g/t; carrying out copper flotation concentration process on the obtained copper flotation concentrate; and (2) carrying out a copper flotation scavenging process on the tailings obtained by the copper flotation roughing process, wherein the collecting agent is butyl xanthate, and the using amount is as follows: 20-30 g/t; the foaming agent is No. 2 oil: 5-10 g/t; performing a magnetic separation process on the tailings obtained by the copper flotation scavenging process, wherein the magnetic field intensity is 111.4 KA/M; performing a sulfur flotation roughing process on the tailings obtained by the magnetic separation process, wherein the concentration of sodium metabisulfite is 1500g/t, the concentration of copper sulfate is 55-65 g/t, the concentration of ethyl xanthate is 30-70 g/t, the concentration of No. 2 oil is 15-25 g/t, and the flotation time is 13 minutes; performing a sulfur flotation scavenging process on the tailings obtained by the sulfur flotation roughing process, wherein 950-1050 g/t of sodium metabisulfite and 27-33 g/t of copper sulfate, 20-30 g/t of ethyl xanthate, 10-20 g/t of No. 2 oil and 5 minutes of flotation time are adopted; and carrying out a secondary desulfurization process on the concentrate obtained by the magnetic separation process to obtain iron concentrate.
Preferably, the amount of the foaming agent used in the process of carrying out copper flotation roughing on the pyrrhotite-containing ore is No. 2 oil: 21g/t
Preferably, the copper flotation concentration process also results in a first middlings, which is returned to the copper flotation roughing concentration process.
Preferably, the second middlings obtained from the copper flotation scavenging process are returned to the copper flotation roughing process.
Preferably, the concentrate obtained by the magnetic separation process is subjected to a first desulfurization process, wherein a chemical agent of sodium metabisulfite is 1450g/t + copper sulfate is 57-63 g/t, ethyl xanthate is 20-40 g/t, No. 2 oil is 15-25 g/t, and the flotation time is 9-10 minutes, so that a product of a third middling and flotation tailings is obtained.
Preferably, the flotation tailings are subjected to a second desulfurization process, wherein a reagent sodium metabisulfite is used in an amount of 450-550 g/t and a reagent copper sulfate is used in an amount of 9-11 g/t, an ethyl xanthate is used in an amount of 15-25 g/t, and a No. 2 oil is used in an amount of 10-20 g/t, and the flotation time is 5 minutes, so that the obtained foam products are fourth middling and iron ore concentrate.
Preferably, the sulfur rougher flotation process produces a sulfur concentrate.
Preferably, the fifth middlings from the sulphur flotation scavenging are returned to the sulphur flotation rougher.
Preferably, the concentrate obtained by the copper flotation concentration process is a copper concentrate.
(III) advantageous effects
The invention adopts equipment with combined action of various force fields, such as a flotation machine and a magnetic separator, which are important supporting points for realizing the method, and the new mineral processing equipment brings good separation effect.
② the invention adopts the method in the sorting process. This can reduce the grade of sulfur in iron ore concentrate, and is another important support point for realizing the invention.
Compared with the known technology, the method can quickly recover copper metal, and can better recover magnetite, pyrite and pyrrhotite, thereby having good economic benefit.
Drawings
Fig. 1 is a process flow diagram of a pyrrhotite-containing beneficiation process according to the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 is a process flow diagram of a pyrrhotite-containing beneficiation process according to the present invention. As shown in fig. 1, the method comprises the following steps:
s1, carrying out a copper flotation roughing process on the pyrrhotite-containing ore and carrying out a copper flotation concentrating process on the obtained copper flotation concentrate.
In particular, the raw material iron ore can be crushed and ground. For example, after the raw material is crushed into-2 mm copper pyrite, grinding is carried out by using a ball mill, lime chemical is added before the grinding is started, the pH value is finally adjusted to be 11 +/-0.5, and the granularity of the product is subjected to overflow control, so that the granularity of-0.074 mm accounts for 74%.
The overflow product is subjected to a copper flotation roughing, which may use a suitable collector and foaming agent. The preferred collector used is butyl xanthate, in amounts: 50-70 g/t; the preferable foaming agent is No. 2 oil, and the using amount is 15-25 g/t.
And performing copper flotation roughing to obtain a product copper flotation roughing concentrate and copper flotation roughing tailings, performing first copper flotation concentration on the copper flotation roughing concentrate in a pH value controlled to be 11-12, wherein the concentration time is between 5 and 15 minutes, for example 10 minutes, and obtaining a product copper flotation concentrating concentrate and a second middling.
And returning the first middlings of the products obtained by the copper flotation concentration to the copper flotation roughing for carrying out copper flotation roughing again, wherein the copper flotation roughing tailings generated by the copper flotation roughing are subjected to copper flotation scavenging operation.
S2, carrying out copper flotation scavenging on the tailings obtained in the copper flotation roughing process.
The process of copper flotation scavenging in this step also uses suitable collectors and frothers. In the invention, preferably, the collecting agent is butyl xanthate, and the dosage is as follows: 20-30 g/t; the foaming agent is No. 2 oil, and the dosage is as follows: 5 to 10 g/t. And the copper flotation scavenging can obtain a second middling and copper flotation scavenging tailings, the second middling returns to the copper flotation roughing for secondary flotation, and the obtained copper flotation scavenging tailings are subjected to magnetic separation operation.
S3, carrying out a magnetic separation process on the tailings obtained by the copper flotation scavenging process.
The step is carried out with a magnetic separation roughing process. The magnetic field strength is preferably 111.4 KA/M. And obtaining magnetic separation roughing concentrate and magnetic separation roughing tailings. And carrying out a sulfur flotation roughing process on the magnetic separation roughing tailings.
S4, carrying out sulfur flotation and roughing on the tailings obtained by the magnetic separation process.
This step is carried out for sulfur flotation roughing. Preferably, A1+ A2:1500+60g/t, ethyl xanthate 30-70 g/t and No. 2 oil 15-25 g/t are used as the adopted reagents, the flotation time is generally 10-15 minutes, preferably 13 minutes, and the sulfur flotation roughing sulfur concentrate and the sulfur flotation roughing tailings are obtained. (the A1 is sodium pyrosulfite, A2 is copper sulfate, B03 is ethyl xanthate, and the unit g/t is gram/ton)
S5, carrying out sulfur flotation scavenging on the tailings obtained by the sulfur flotation roughing process.
The sulfur flotation roughing tailings are subjected to primary sulfur flotation scavenging, the sulfur flotation scavenging is preferably performed by using A1+ A2:1000+30g/t, ethyl xanthate is 20-30 g/t, No. 2 oil is 10-20 g/t, and the flotation time can be about 5 minutes. And returning the obtained foam product to sulfur flotation roughing for the fifth middling, and performing sulfur flotation roughing again.
And S6, carrying out a secondary desulfurization process on the concentrate obtained by the magnetic separation process to obtain iron concentrate.
This step will perform two desulfurization processes. And (3) carrying out first desulfurization operation on the magnetic separation rough concentration, wherein a medicament A1+ A2 is used for being mixed with 1500+60g/t, ethyl xanthate is used for being mixed with 20-40 g/t, No. 2 oil is used for being mixed with 15-25 g/t, and the flotation time is preferably 9 minutes, so that a third middling and flotation tailings of a product are obtained. And (3) performing secondary desulfurization operation on the flotation tailings, wherein a reagent A1+ A2 is used for 500+10g/t, ethyl xanthate is used for 15-25 g/t, No. 2 oil is used for 10-20 g/t, and the flotation time can be about 5 minutes, so that the foam products, namely fourth middling and iron ore concentrate, are obtained.
And in the steps S1-S6, the third middling, the fourth middling and the sulfur concentrate are combined into comprehensive sulfur concentrate.
Example 1: the raw material is Anhui-copper-sulfur-iron, wherein the raw ore contains 0.366% of Cu0, 32.54% of S and 39.85% of Fei. The mineral composition of the ore is complex, wherein the metal minerals comprise chalcopyrite, magnetite, hematite, pyrrhotite, pyrite, galena and siderite. The nonmetallic minerals are mainly carbonate minerals. The ore mainly has a lump structure and a dip-dyed structure. Mineral intercalation is complicated, and magnetite crack development is divided into a plurality of particles by calcite, and the intercalation particle size is mainly fine particles. The copper mineral content is rare and more dispersed. The pyrite has spot-shaped metamorphosis and unequal grain metamorphosis structures, and the embedding granularity is extremely unequal grain embedding. The main reason is that the intercalation particle size is fine and is penetrated and cut by a calcite net vein, so that the monomer is difficult to dissociate. The process flow shown in figure 1 is adopted, and the specific process parameters are as follows:
crushing raw materials into copper-sulfur-iron ore with the particle size of-2 mm, grinding the iron ore in a ball mill (the product particle size is subjected to overflow control so that the particle size is-0.074 mm to account for 74%), adding lime medicament before grinding the iron ore, and finally enabling the pH value to be 11 +/-0.5.
Secondly, firstly, carrying out primary copper flotation and fine selection on overflow products (the usage amount of butyl xanthate used as a collecting agent is 50-70 g/t, the usage amount of No. 2 oil used as a foaming agent is 21g/t), and carrying out primary copper flotation and fine selection on flotation concentrates (the pH value is controlled to be 11-12). And returning the flotation tailing products to the first copper flotation roughing operation. And (3) carrying out first copper flotation scavenging operation on the tailings subjected to the first copper flotation roughing (the use amount of a butyl xanthate as a collecting agent is 20-30 g/t, and the use amount of a No. 2 oil as a foaming agent is 7g/t), returning the flotation concentrate to the first copper flotation roughing operation, and carrying out next magnetic separation operation on the flotation tailings.
And thirdly, carrying out magnetic separation operation after copper flotation operation, wherein the operation adopts primary magnetic separation roughing and secondary magnetic separation fine separation desulfurization operation. The method comprises the following specific operations that the iron ore is subjected to magnetic separation roughing operation (the magnetic field intensity is 111.4KA/M), the magnetic concentrate is subjected to desulphurization operation I (A1+ A2:1500+60g/t, B03 30g/t, No. 2 oil 21g/t, and the flotation time is 9 minutes), and a sulfur concentrate product I is obtained. And (3) carrying out desulfurization operation II on the flotation tailings obtained in the desulfurization operation I (A1+ A2:500+10g/t, B03 medicine 10g/t, No. 2 oil 14g/t and flotation time 5 minutes), and obtaining a sulfur concentrate product II from a foam product, wherein the tailings are iron concentrates.
And fourthly, carrying out primary roughing and primary scavenging operation on the sulfur concentrate on the magnetic rough concentration tailings. The specific operation is as follows, the magnetic separation tailings are subjected to sulfur roughing operation (A1+ A2:1500+60g/t, B03 drug: 50g/t, No. 2 oil: 21g/t, flotation time is 13 minutes), and a third sulfur concentrate product is obtained. And (3) carrying out sulfur scavenging operation on the flotation tailings in the sulfur roughing operation (A1+ A2:1000+30g/t, B03 medicine: 30g/t, No. 2 oil: 14g/t, and flotation time is 5 minutes), returning the foam product to the sulfur roughing operation, wherein the flotation tailings are final tailings.
And the first sulfur product, the second sulfur product and the sulfur concentrate are combined together to obtain the comprehensive sulfur concentrate.
In summary, the products after flotation are as follows:
the embodiment shows that the invention adopts a novel process flow in the separation process, shortens the mineral separation process, adopts low alkali, reduces the consumption of lime in the generation process, improves the subsequent dehydration process and reduces the generation cost. A novel pyrrhotite agent activator (A1+ A2) was used. Compared with the activation of a sulfuric acid activating agent, the method can reduce the grade of sulfur in the iron ore concentrate, and good separation effect is brought by adopting equipment with combined action of various force fields.
Meanwhile, in the separation process, valuable metals in the copper-iron ore, including metal objects such as copper, iron, sulfur, pyrrhotite and the like, are comprehensively recovered, the production cost is reduced, and the economic benefit is increased.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A beneficiation method for pyrrhotite-containing ore is characterized in that: the method comprises the following steps:
carrying out copper flotation roughing process on the magnetic pyrite, wherein the collecting agent uses butyl xanthate, and the using amount is as follows: 50-70 g/t; the foaming agent is No. 2 oil: 15-25 g/t; carrying out copper flotation concentration process on the obtained copper flotation concentrate;
and (2) carrying out a copper flotation scavenging process on the tailings obtained by the copper flotation roughing process, wherein the collecting agent is butyl xanthate, and the using amount is as follows: 20-30 g/t; the foaming agent is No. 2 oil: 5-10 g/t;
performing a magnetic separation process on the tailings obtained by the copper flotation scavenging process, wherein the magnetic field intensity is 111.4 KA/M;
performing a sulfur flotation roughing process on the tailings obtained by the magnetic separation process, wherein the concentration of sodium metabisulfite is 1500g/t, the concentration of copper sulfate is 55-65 g/t, the concentration of ethyl xanthate is 30-70 g/t, the concentration of No. 2 oil is 15-25 g/t, and the flotation time is 13 minutes;
performing a sulfur flotation scavenging process on the tailings obtained by the sulfur flotation roughing process, wherein 950-1050 g/t of sodium metabisulfite and 27-33 g/t of copper sulfate, 20-30 g/t of ethyl xanthate, 10-20 g/t of No. 2 oil and 5 minutes of flotation time are adopted;
and carrying out a secondary desulfurization process on the concentrate obtained by the magnetic separation process to obtain iron concentrate.
2. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: the foaming agent used in the process of carrying out copper flotation roughing on the magnetic pyrite is No. 2 oil, and the dosage of the foaming agent is as follows: 21 g/t.
3. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: the copper flotation concentration process also results in a first middlings that is returned to the copper flotation roughing concentration process.
4. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: and returning the second middlings obtained by the copper flotation scavenging process to the copper flotation roughing process.
5. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: and (3) carrying out a first desulfurization process on the concentrate obtained by the magnetic separation process, wherein a chemical agent of sodium metabisulfite is 1450g/t and copper sulfate is 57-63 g/t, ethyl xanthate is 20-40 g/t, No. 2 oil is 15-25 g/t, and the flotation time is 9-10 minutes, so as to obtain a product of a third middling and flotation tailings.
6. The pyrrhotite-containing beneficiation process according to claim 5, characterized in that: and performing a second desulfurization process on the flotation tailings, wherein a reagent sodium metabisulfite is used at the ratio of 450-550 g/t and copper sulfate is used at the ratio of 9-11 g/t, ethyl xanthate is used at the ratio of 15-25 g/t, No. 2 oil is used at the ratio of 10-20 g/t, and the flotation time is 5 minutes, so that the obtained foam products are fourth middling and iron ore concentrate.
7. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: and the sulfur roughing flotation process obtains sulfur concentrate.
8. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: and returning the fifth middling obtained by the sulfur flotation scavenging to the sulfur flotation roughing.
9. The pyrrhotite-containing beneficiation process according to claim 1, characterized in that: the concentrate obtained by the copper flotation and concentration process is copper concentrate.
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