CN102294297B - Magnetic suspension beneficiation combined method for recycling copper from copper melting converter slag - Google Patents

Abstract

The invention discloses a magnetic suspension beneficiation combined method for recycling copper from copper melting converter slag. The method comprises the following steps of: crushing crude ores, and then feeding into a ball mill; discharging the ores out of the ball mill, and feeding into a grader; returning sand by using the grader for low-intensity magnetic separation, wherein non-magnetic slag which is subjected to magnetic separation can be directly used as a copper concentrate product; returning magnetic slag into the ball mill to form a closed cycle, wherein the concentration of overflow ore pulp is controlled to be 40 weight percent, the fineness is controlled to be -0.074mm, and the occupancy rate is more than 65 percent; and performing first roughing, second roughing, third roughing and one-time scavenging, combining foams generated in the three-time roughing process, and thus obtaining the copper concentrate product. In the method, a magnetic suspension combined process is utilized, so that coarse grain copper can be effectively recycled in advance; by the method, the grade range of the converter slag is wide, so that the converter slag with the copper content from 3percent to 12 percent can be selected; and the method is convenient to operate and is low in cost, enterprise benefits are directly improved, and high-grade copper converter slag resources can be developed and utilized simultaneously.

Description

Reclaim the Combination of magnetic separation flotation beneficiation method of copper from the copper converter slag

(i) technical field: the present invention relates to a kind of method that reclaims copper, specifically from the copper converter slag, reclaim the Combination of magnetic separation flotation beneficiation method of copper.

(ii) background technology: at present, copper smelting converter slag Experimental study on ore dressing and production instance report are more both at home and abroad, but its actual production copper-separating process flow process all adopts single flotation, and single floatation process has following limitation:

1, single flotation is applicable to the flotation of low-grade copper metallurgical slag.When copper smelting slag containing copper grade lower than 1% the time, in its slag, the copper mineral disseminated grain size is thinner, does not have the bright copper of large grain.Therefore single flotation is applicable to the processing that copper is smelted smelting slag;

2 and for copper smelting converter slag, the cupric grade is higher than 4%, and higher containing copper grade, more containing the bright copper amount of seedy in metallurgical slag.The bright copper of coarse grain is because hardness is high, good toughness, so its difficult broken difficult mill.For froth flotation, when after comminution, bright shot copper degree is greater than 1mm, due to bright copper, than great, flotation froth is difficult to absorption;

3, contain for copper smelting converter slag the problem that the bright copper amount of seedy is many, general field by using countermeasure is: reduce Ball mill throughput, further strengthen fine grinding; The floating agent amount is multiplied.Above countermeasure can increase beneficiation cost undoubtedly, even and take above countermeasure, also be difficult to copper smelting converter slag ore dressing dilution to the waste grade, copper smelting converter slag cupric is higher, more containing the bright copper amount of seedy, the flotation tailing copper grade is higher.

(iii) summary of the invention: purpose of the present invention just is to provide a kind of Combination of magnetic separation flotation beneficiation method that reclaims copper from the copper converter slag; The method can shift to an earlier date, effectively reclaim the bright copper of coarse grain in vessel slag, significantly improve the rate of recovery of copper by Combination of magnetic separation flotation technique, make the copper vessel slag of different grades develop processing and utilization through beneficiation method, significantly reduce smelting cost, increase China's copper raw material degree of self-sufficiency.

The present invention includes following step:

(1) by be crushed to-15mm of raw ore slag particle degree, enter filler bin;

(2) the slag powder feeds ball mill through belt-conveying.Ball mill ore discharging enters grader, and the permanent magnetic separator magnetic separation is carried out in the grader sand return, magnetic field intensity: 1800 oersteds, and the non magnetic slag of magnetic separation can be directly as the copper concentrate product; Magnetic slag returns to ball milling and forms closed circuit.Classifier overflow ore pulp concentration expressed in percentage by weight is controlled at 40%, fineness is controlled at--and 0.074mm, occupation rate are greater than 65%, enter and sort operation;

(3) the overflow ore pulp enters tank diameter, and former slag per ton adds medicament: butyl xanthate 200 grams, No. 2 oil 45 grams, and sizing mixing enters flotation and roughly selects the stage for the first time;

(4) roughly select for the first time ore pulp after choosing through cyclone classification, hydrocyclone sand enters secondary grinding, and mog is controlled at--and 0.043mm, occupation rate are greater than 75%; The secondary grinding ore discharge is squeezed into cyclone; The cyclone overflow is added medicament by former slag per ton: butyl xanthate 100 grams, No. 2 oil 30 grams, and size mixing to enter for the second time and roughly select;

(5) roughly select for the second time rear ore pulp and press former slag interpolation medicament butyl xanthate per ton 80 grams, No. 2 oil 30 grams, size mixing to enter for the third time and roughly select; Ore pulp after roughly selecting for the third time enters and scans by former slag interpolation medicament butyl xanthate per ton 60 grams, No. 2 oil 20 grams.Scan the cyclone that foam turns back to front, the ore pulp after scanning is transported to tailings reservoir for piling as true tailings;

(6) roughly select the foam merging for three of magnetic separation non-magnetic product and flotation times and be final copper concentrate product through concentrated, filtration.

The inventive method adopts coarse fraction sand return in ball milling and classification loop, increases magnetic separation and separates.Utilize that the bright copper hardness of coarse grain is high, good toughness, difficult broken difficult mill; The copper smelting slag iron content is high, magnetic mineral content is high, and the bright copper of coarse grain belongs to the characteristics of non-magnetic separation mineral, by magnetic separation, the bright copper of most of coarse grain is that non magnetic ore is enriched to magnetic tailing and can directly becomes copper concentrate, and magnetic concentrate is magnetic mineral, turns back in ball milling and classification loop again.

The inventive method compared with prior art, has the following advantages: 1. adopt the inventive method, can utilize existing equipment, place, without increasing new investment, only increase a weak magnetic separator and ore slurry pump, small investment, instant effect; And existing production is not formed to impact, easily implement.Can adapt to different ore dressing scales; Applicable vessel slag grade scope is wide, from cupric 3% to 12%, all can be selected in; Easy to operate, cost is low, 2. because part classification sand return is reclaimed in advance, and the bright copper of coarse grain of difficult broken difficult mill, therefore can directly increase the mineral processing production ability; 3. because there is not the bright copper of coarse grain in floatation process, can effectively improve the flotation operation copper recovery, thereby increase ore dressing copper comprehensive recovery.Can effectively reduce floating agent butyl xanthate and No. 2 oil (terpenic oil) consumption simultaneously.

(iv) accompanying drawing explanation

Fig. 1 is process flow diagram of the present invention.

(v) the specific embodiment

(1) 100 tons of be crushed to-15mm of the former slag that is 9% by copper grade, enter filler bin;

(2) the slag powder feeds ball mill through belt-conveying.Ball mill ore discharging enters grader, and the permanent magnetic separator magnetic separation is carried out in the grader sand return, magnetic field intensity: 1800 oersteds, and the non magnetic slag magneticly elected can be directly as the copper concentrate product; Magnetic slag returns to ball milling and forms closed circuit.Classifier overflow ore pulp concentration expressed in percentage by weight is controlled at 40%, fineness is controlled at--and 0.074mm, occupation rate are greater than 65%, enter and sort operation;

(3) the overflow ore pulp enters tank diameter, adds butyl xanthate 20kg, No. 2 oily 4.5kg, sizes mixing to enter flotation and roughly select the stage for the first time;

(4) roughly select for the first time ore pulp after choosing through cyclone classification, hydrocyclone sand enters secondary grinding, and mog is controlled at--and 0.043mm, occupation rate are greater than 75%; The secondary grinding ore discharge is squeezed into cyclone; Add butyl xanthate 10kg, No. 2 oily 3kg in cyclone overflow ore pulp, size mixing to enter for the second time and roughly select;

(5) roughly select for the second time rear ore pulp and add butyl xanthate 8kg, No. 2 oily 3kg, size mixing to enter for the third time and roughly select; Ore pulp after roughly selecting for the third time adds butyl xanthate 6kg, No. 2 oily 2kg and enters and scan.Scan the cyclone that foam turns back to front, the ore pulp after scanning is transported to tailings reservoir for piling as true tailings;

(6) the foam merging of roughly selecting for three times of the non-magnetic product magneticly elected and flotation is final copper concentrate product through concentrated, filtration.

Finally obtain 31.16 tons of the copper concentrate products of concentrate grade 28% in the present embodiment, copper recovery is 96.94%, than prior art, improves 2.36 percentage points of copper recoveries.0.2124 ton of the copper tenor that reclaim, increase by 0.7586 ton of copper concentrate amount more.

Claims (1)

1. reclaim the Combination of magnetic separation flotation beneficiation method of copper from the copper converter slag, it is characterized in that comprising the steps:

(1) by be crushed to-15mm of raw ore slag particle degree, enter filler bin;

(2) the slag powder feeds ball mill through belt-conveying; Ball mill ore discharging enters grader, and the permanent magnetic separator magnetic separation is carried out in the grader sand return, magnetic field intensity: 1800 oersteds, and the non magnetic slag of magnetic separation is directly as the copper concentrate product; Magnetic slag returns to ball milling and forms closed circuit; Classifier overflow ore pulp concentration expressed in percentage by weight is controlled at 40%, be controlled at-0.074mm of fineness occupation rate is greater than 65%, enters and sorts operation;

(3) the overflow ore pulp enters tank diameter, and former slag per ton adds medicament: butyl xanthate 200 grams, No. 2 oil 45 grams, and sizing mixing enters flotation and roughly selects the stage for the first time;

(4) roughly select for the first time ore pulp after choosing through cyclone classification, hydrocyclone sand enters secondary grinding, and be controlled at-0.043mm of mog occupation rate is greater than 75%; The secondary grinding ore discharge is squeezed into cyclone; Cyclone overflow ore pulp adds medicament by former slag per ton: butyl xanthate 100 grams, No. 2 oil 30 grams, and size mixing to enter for the second time and roughly select;

(5) roughly select for the second time rear ore pulp and press former slag interpolation medicament butyl xanthate per ton 80 grams, No. 2 oil 30 grams, size mixing to enter for the third time and roughly select; Ore pulp after roughly selecting for the third time enters and scans by former slag interpolation medicament butyl xanthate per ton 60 grams, No. 2 oil 20 grams; Scan the cyclone that foam turns back to front, the ore pulp after scanning is transported to tailings reservoir for piling as true tailings;

(6) roughly select the foam merging for three of magnetic separation non-magnetic product and flotation times and be final copper concentrate product through concentrated, filtration.

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