CN103316775A

CN103316775A - High-sulfur magnetite concentrate efficient activated flotation desulfuration method

Info

Publication number: CN103316775A
Application number: CN2013101897293A
Authority: CN
Inventors: 曹钊; 曹永丹; 张金山; 李解
Original assignee: Inner Mongolia University of Science and Technology
Current assignee: Inner Mongolia University of Science and Technology
Priority date: 2013-05-21
Filing date: 2013-05-21
Publication date: 2013-09-25
Anticipated expiration: 2033-05-21
Also published as: CN103316775B

Abstract

The invention discloses a high-sulfur magnetite concentrate efficient activated flotation desulfuration method. Water is added into high-sulfur magnetite concentrate to make a solution, then size mixing is performed when certain concentration of the solution is achieved, activator CA, copper sulfate, collector sodium butyl xanthogenate and foaming agent number two oil are added into the solution sequentially, one-rough-one-fine desulfurization flotation is performed, and the final low-sulfur iron ore concentrate and sulfur concentrate can be obtained. The high-sulfur magnetite concentrate efficient activated flotation desulfuration method has the advantages of being high in desulfurization efficiency, low in medicament corrosivity and simple in technological flow. For iron ore concentrate with sulfur content as high as 1.19%, sulfur content of the final iron ore concentrate can be reduced to lower than 0.15%, desulfurization degree can reach to higher than 90%, and iron recovery rate can reach to higher than 92%.

Description

The method of the efficient active flotation desulfurization of high-sulfur magnetite concentrate

Technical field

The present invention relates to the method for the efficient active flotation desulfurization of high-sulfur magnetite concentrate, belong to the iron ore beneficiation technical field.

Background technology

Sulphur is one of harmful element main in the iron ore concentrate, and the content that reduces sulphur in the iron ore concentrate by the ore dressing means is a great problem that iron ore is produced always.

Sulphur mainly exists with pyrite and magnetic iron ore in the high sulfide pyrite, pyrite is not owing to there being magnetic, in the magnetic separation process, be easy to separate with bloodstone with the magnetic iron ore of magnetic, but magnetic iron ore is owing to having ferromagnetism, in the magnetic separation process, can enter magnetic concentrate, when magnetic iron ore content is higher in the raw ore, sulfur content will be difficult to be reduced to below the Iron Concentrate Quality requirement by magnetic separation in the final iron ore concentrate.The magnetic iron ore effective method is reverse flotation in the discrete magnets ore deposit at present, even magnetic iron ore enters the flotation froth product, flotation cell internal magnet ore deposit is final desulfurization iron ore concentrate, but very easily oxidation of magnetic iron ore, Surface Creation ferric sulfate and iron hydroxide hydrophilic layer, thereby its floatability energy of decrease; And the calcium ion in the flotation pulp is easy and the sulfate radical reaction of Surface of Pyrrhotite generates hydrophilic calcium sulfate film, further reduces its hydrophobic properties of the surface.Be at present the activation PYRRHOTITE BY FLOTATION, usually in floatation process, add the hydrophilic layer that a large amount of sulfuric acid cleans Surface of Pyrrhotite, but finally the iron ore concentrate sulfur-bearing be difficult to still fall, and the perishable pipeline of sulfuric acid and floatation equipment, worsen production environment.Therefore, the high-sulfur magnetic iron ore does not have good processing method at present, by the efficient activator activation magnetic iron ore floatation desulphurization is not also had instantiation.

Summary of the invention

The method that the purpose of this invention is to provide a kind of efficient active flotation desulfurization of high-sulfur magnetite concentrate of efficient, non-corrosive, flow process simple possible solves that present magnetic iron ore desulfurization is difficult, the present situation of using sulfated corrosive equipment.

Technical scheme

The method of the efficient active flotation desulfurization of high-sulfur magnetite concentrate is specially:

(1) water in the high-sulfur magnetite concentrate adding flotation device is sized mixing, pulp density remains on 35-45%;

(2) press the high-sulfur magnetite concentrate and do ore deposit amount weight ratio, add successively activator ammonium hydrogen citrate 50-200g/t, activator copper sulphate 100-300g/t, collecting agent butyl xanthate 30-120g/t, No. 2 oily 10-50g/t of foaming agent, roughly select, scraped bubble 4-8 minute, obtain sulphur concentrate 1(and roughly select foam product) and desulfurization rough concentrate (product in the groove);

(3) add successively again activator ammonium hydrogen citrate 25-100g/t in the desulfurization rough concentrate that step (2) is obtained, copper sulphate 50-150g/t, collecting agent butyl xanthate 15-60g/t, No. 2 oily 5-25g/t of foaming agent, carry out selected, scraped bubble 3-6 minute, and obtained the selected foam product of sulphur concentrate 2() and final iron ore concentrate (product in the groove).Sulphur concentrate 1 and sulphur concentrate 2 are merged into the mix sulphur concentrate.

The amino group substitution degree of activator ammonium hydrogen citrate is 2-3 among the present invention.

Characteristics of the present invention are: the present invention adopts combination activator ammonium hydrogen citrate+copper sulphate to replace sulfuric acid magnetic iron ore is activated, also do not find with ammonium hydrogen citrate as floating agent at present, ammonium hydrogen citrate has stronger complex compound performance, the calcium ion in the ore pulp solution is stablized in the energy complexing, prevent that it from generating the calcium sulfate passivating film at mineral surfaces, and the oxide-film of Surface of Pyrrhotite is cleaned in complexing, increase collecting agent in the mineral surfaces adsorbance, so use ammonium hydrogen citrate+copper sulphate combination activator, has desulfuration efficiency high, medicament corrosivity is little, the simple characteristics of technological process, sulfur-bearing is up to 1.2% magnetite concentrate, adopt the technology of the present invention, sulfur content in the final iron ore concentrate can be down to below 0.2%, desulfurization degree is greater than 85%, and the iron loss rate is less than 8%.

Description of drawings

Fig. 1 is the flow chart of high-sulfur magnetite concentrate active flotation of the present invention desulfurization.

The specific embodiment

Embodiment:

The iron grade is 67.20% in the Baotou Area, NeiMongol one high-sulfur magnetite concentrate, and sulfur content is up to 1.19%, and the low-sulfur iron ore concentrate that needs for obtaining satisfying the market adopts one roughing, a concentrate flotation flowsheet that it is carried out desulfurization.The primary slurry mass concentration is 40%, and floating agent adds successively according to activator ammonium hydrogen citrate, activator copper sulphate, collecting agent butyl xanthate and No. 2 oil orders of foaming agent, roughly selects, and flotation 5 minutes is roughly selected and obtained sulphur concentrate 1 and desulfurization rough concentrate.Dosing sees Table 1.

In the desulfurization rough concentrate, add successively floating agent by ammonium hydrogen citrate, copper sulphate, butyl xanthate and No. 2 oil orders, the basis that consumption is roughly selected consumption at table 1 reduces by half, carry out selected, flotation 3 minutes, obtain sulphur concentrate 2 and final iron ore concentrate, sulphur concentrate 1 and sulphur concentrate 2 are merged into the mix sulphur concentrate.Result of the test sees Table 2.

Table 1 floating agent dosage (g/t does ore deposit amount re-computation by flotation to the ore deposit)

Embodiment	Ammonium hydrogen citrate	Copper sulphate	Butyl xanthate	No. 2 oil
					1	60	100	50	15
2	90	120	70	15
					3	90	150	90	25
4	120	120	90	25

Table 2 high-sulfur magnetic iron ore active flotation desulfurization test result

Claims

1. the method for the efficient active flotation desulfurization of high-sulfur magnetite concentrate is characterized in that, described method step is as follows:

(1) water in the high-sulfur magnetite concentrate adding flotation device is sized mixing, the ore pulp mass concentration remains on 35-45%;

(2) press the high-sulfur magnetite concentrate and do ore deposit amount weight ratio, add successively activator ammonium hydrogen citrate 50-200g/t, activator copper sulphate 100-300g/t, collecting agent butyl xanthate 30-120g/t, No. 2 oily 10-50g/t of foaming agent, roughly select, scraped bubble 4-8 minute, obtain sulphur concentrate 1 and desulfurization rough concentrate;

(3) add successively again ammonium hydrogen citrate 25-100g/t in the desulfurization rough concentrate that step (2) is obtained, copper sulphate 50-150g/t, collecting agent butyl xanthate 15-60g/t, No. 2 oily 5-25g/t of foaming agent, carry out selected, scraped bubble 3-6 minute, and obtained sulphur concentrate 2 and final iron ore concentrate, sulphur concentrate 1 and sulphur concentrate 2 are merged into the mix sulphur concentrate.

According to claim 1 described in the efficient active flotation sulfur method of high-sulfur magnetite concentrate, it is characterized in that: the amino group substitution degree of ammonium hydrogen citrate is 2-3.