Lead oxide zinc ore flotation

Lead oxide zinc ore flotation

1. The floatability and separation method of the main lead-zinc minerals

Common lead oxide minerals are cerussite (PbCO3), lead alum (PbSO4), arsenic galena [Pbs (AsO4), Cl] , crocoite (PbCrO4), lead phosphate chloro alum [Pb, (PO4) jCl] And molybdenum ore (PhMo04) and so on. White lead ore, lead bismuth and pinch lead ore may be vulcanized with sodium sulfide, calcium sulfide, sodium thiosulfate or the like. However, the lead vulcanization requires a large amount of vulcanizing agent and a long contact time. Arsenic, lead, chromite and chlorite are difficult to vulcanize and most are lost in tailings.

Common zinc oxide minerals such as ZnCO3, Zn, Zn2Si04.H2O, and ZnSiO, n-zinc carbonates and oxides can be heated (50 ~709C) Vulcanization, while silicate minerals are difficult to vulcanize. Can only be collected with cationic collectors .

CF collector (the main component is N-nitroso-N-benzoquinone ammonium salt) can be collected for both white lead or zinc ore. Mercaptobenzothiazole (MBT) has good selectivity for lead oxide ore, and chlorothiophenol (ATP) has good selectivity to zinc oxide ore. Phenylthiourea hydrocarbyl diphenyl sulfate has strong trapping power for white lead ore.

There are three general methods for flotation of lead oxide zinc ore:

(1) Discharged with xanthate collector after vulcanization;

(2) directly using fatty acids to capture;

(3) Zinc oxide ore is collected by primary amines.

From the order of flotation, there are “first sulfur after oxygen” and “first lead after zinc”: There are two options:

(1) galena lead oxide, a sphalerite, zinc oxide ore;

(2) Galena, a sphalerite, lead oxide ore, zinc oxide ore.

During the vulcanization process, sodium sulphide should be added step by step to prevent excessive inhibition of HS~ and S3-, and avoid excessive pH (should be less than 10.5). In order to prevent Ca2+ and Mg2+ from forming their hydroxide film on the surface of minerals such as leucite, a small amount of ammonium sulphate should be added. After vulcanization zinc oxide, copper sulfate also activated, and neutral oils with a powerful collector collector.

Flotation of zinc oxide ore with primary amine collectors is a common method. It is suitable for processing high iron containing material, a primary amine to amine is preferably C12 ~ C18. The amine above C16 can be melted well at 25~50C. The pH of the primary amine flotation flotation is 10.5~11.5, which is best adjusted with sodium sulfide.

With the cation collector flotation, the effect of the slime is obvious. The fine mud content of less than 10 pm is less than 15%, and soda, water glass, carboxymethyl cellulose, lignosulfonate, sodium humate, etc. can be added to eliminate the influence of slime. When the content of fine mud less than 10um exceeds 15%, the mud should be removed first to reduce the consumption of the agent, and a dispersing agent such as sodium sulfide or sodium silicate is added during the deliming.

2. An example of flotation of a lead oxide ore mine in Xinjiang

Although the example is experimental data, the method is mature and representative, and the mine is very promising.

The conditions for flotation of lead are: flotation pH=9~10, sodium carbonate is better than sodium hydroxide, sodium sulfide is used as vulcanizing agent, and added with xanthate, sodium sulfide dosage is 2 +2kg /l, "The amount of butyl yellow is 400 +100g / l. The result is that the butyl xanthate + butyl ammonium black drug, the butyl xanthate + cyclohexylamine black drug and the butyl yellow drug alone are single butyl. The best yellow medicine. Because the lead oxide is easy to drop when it is selected, it is beneficial to add 50g/t sodium oleate. For the gangue mineral inhibitor, it is compared with water glass, starch, ammonium humate and tannin. It is best to use water glass and ammonium humate.

The conditions for flotation of zinc are: The use of tannin to inhibit gangue is better than humic acid, and the amount of tannin is 400g/t. The collector is 500 g/t of alkyl dodecylamine and 30-40 g/t of hydroxamic acid. In the test, it was also found that the dosing sequence had an effect on the results. The final dose and the order of addition were as shown in Figure 12-2.

Flotation test results, closed circuit process test results Table 12-3