What are the enhancements to the recovery of silver-containing minerals?

(1) Collector

The collectors for enhancing the flotation recovery of silver- containing minerals are butyl xanthate, butyl ammonium black drug, butyl xanthogen propionitrile ester, ethyl sulphide nitrogen, aniline black drug, Z-200, milk polypyridyl tar , benzyl carboxyl acetylene compound, transformer oil, mercapto-dithio phosphate, 25 aerofloat, aminoalcohols aerofloat, diltiazem methyl ester, fourth phosphamidon, methyl isobutyl carbinol, mercaptobenzothiazole Thiazole, octylamine black, isoprenium black, isopropyl xanthate, sodium pentyl xanthate, thiocarbamate, AC-404, AD-242, 0rfomC0800, and the like. In flotation, it is often the case that two of the above agents are combined in a certain ratio.

Because the butyl ammonium black drug has good selectivity to silver, lead , gold and other minerals, especially mixed with Dinghuang medicine, it is better than other collectors (such as No. 25 black medicine, ethyl sulphide, etc.). The work of mixing butyl ammonium black medicine is more.

The silver-copper Hongshan high tetrahedrite ore (mainly silver-containing minerals) floating slow and butylammonium aerofloat action over a longer period, drugs used alone butylammonium black (30 g / ton) low collector as collector silver recoveries (only 77.18%) and other characteristics, when mixed use of Dinghuang medicine (10 g / ton) + butyl ammonium black medicine (20 g / ton), the butyl ammonium black medicine is all added to the grinding operation, which can make the recovery rate of silver large Increased by 91.62%, coarse

The grade of silver in the concentrate was 529 g/t. When the two collectors were simultaneously added to the flotation operation, the recovery rate of silver was only 86.62%.

When the pH value is about 8, the Geyang copper ore selection plant also uses butyl ammonium black drug and butyl xanthic acid propionitrile ester as the collector. The butyl ammonium black drug is added to the ball mill to strengthen the silver-containing minerals and float. Select the role of the agent to increase the recovery rate of silver.

The use of butyl ammonium black drug and amine benzene black drug, supplemented by z-200 and polyisopropylbenzene tar, can achieve good collection of copper and lead. The lead and silver recovery rates of Mengsi silver lead ore are 94% and 94.88% (Pb+Zn concentrate), the recovery rates of copper, lead, zinc and silver in Zhanzigou reached 89%, 62%, 74% and 94% respectively. However, the shortcoming of butylammonium black medicine is that it takes a long time to act.

The benzyl acetylene carboxyl compound is an effective collector for silver, and is widely used as a non-polar additive in the flotation of sulphide ore. The replacement of some butyl sulphate with transformer oil can improve the flotation speed of gold and silver. Concentrate quality.

Feng Yu processing plant in Japan were used thiazol-mercaptobenzothiazole, and mercapto-substituted dithiophosphate xanthate lead when roughing and selected, galena and pyrite flotation greatly improved selectivity and reduce the amount of NaCN, may Increase the silver recovery rate.

Dongbo Chaishan Plant is a lead-zinc plant with 60-70 g/ton of silver. Before 1980, NaCN (80-100 g/ton) was used as an inhibitor. Silver was graded at 1000 g/ton in lead concentrate. The recovery rate was 38.6%. When ethyl sulphate was used instead of butyl sulphate, lead was selected under high pH (10-12), the amount of NaCN was also reduced to 30-40 g/ton, and the silver recovery rate was 51.47%.

The Chaoan Houpo bismuth ore mine uses lead, zinc and sulfur flotation in a high alkali medium using an amine alcohol xanthate to obtain a qualified silver-lead concentrate. The silver lead recovery rate is increased by 15% and 12%, respectively.

(2) inhibitor

In the flotation process of silver-containing polymetallic ores, common inhibitors are lime, sodium sulfite, sodium sulfide, zinc sulfate, sodium carbonate, cyanide, sodium thiosulfate, sulfur dioxide, water glass, silicone, potassium metabisulfite. , potassium permanganate, chromate weight, vinylidene sodium sulfide, dimethyl dithiocarbamate and the like.

In order to facilitate the flotation separation of polymetallic ore containing precious metal silver gold, Dong Nailiang and Zhu Guanyue believe that it is necessary to study the non-stopping of the floatability of silver-gold minerals, chalcopyrite, galena and the like. It does not inhibit the inhibitors of sphalerite, pyrite and harmful impurity minerals. The preferred non-cyanide inhibitor for flotation is lime, sodium sulfite, sodium sulfide, zinc sulfate, sodium carbonate, sodium sulfite, sodium thiosulfate, etc., and sodium carbonate in the mixed flotation is beneficial to the flotation of silver-gold sulfide minerals. Cyanide can effectively sort galena, chalcopyrite, sphalerite and pyrite, but also inhibits the silver ore. When the amount is large, it will dissolve silver gold and secondary copper minerals. What is important is that it The environment constitutes a major hazard, so companies should try not to use cyanide, and use the micro-cyanide process as a last resort. Lime inhibits zinc and sulfur minerals better, but the large amount and pH value greater than 12 also inhibit silver minerals, and the silver recovery rate may decrease by 3% to 5%. Sulfur dioxide is a potent inhibitor of sphalerite, which facilitates the sorting of galena, silver minerals and pyrite, but excessive inhibition of silver minerals and galena, with suitable pH values ​​between 6.3 and 6.5.

The use of zinc sulphate and sodium thiosulfate in the Dajing silver-copper mine has been found to have significant inhibitory effects on arsenic , zinc and pyrite, but has no effect on the recovery of silver-copper minerals. .

In the selective separation of, for example, copper-lead and lead-lead, the combination of zinc sulfate and cyanide has a better inhibitory effect on secondary copper minerals; when lead-free copper is used, when dichromate is used as an inhibitor, if When copper is produced, the other party's lead ore suppression effect is poor. Sulfurous acid can control the floating of the slime, does not dissolve silver gold and has little inhibitory effect, and has activating effect on copper minerals. The order of inhibiting minerals is: pyrite- sphalerite-galena - chalcopyrite . Sodium bisulfite and sodium sulfite are easy to adjust during selective separation, and are convenient to use, but costly. Lime and ammonium cyanide have obvious inhibitory effects on arsenic-containing minerals, and little inhibition on silver and copper minerals, which is beneficial to improve the recovery rate of associated silver.

The Shuikoushan lead-zinc mine used sodium pyrosulfite, zinc sulfate, sodium sulfide and lime as pyrite and zinc mineral inhibitors instead of the cyanide process. Ethylsulfide was used as a lead collector in high pH conditions. The recovery rate of silver and gold increased from 74.51% and 31.06% of the cyanide process to 75.36% and 35.14%.

The lead-zinc system of Baoshan Copper Mine has a crude ore grade of 195 g/t and a silver content of lead concentrate in the case of potassium permanganate dosage of 150-200 g/t and sodium cyanide dosage of 150-200 g/ton. The recovery rate is 66.35%. After grinding fineness adjustment and reducing the dosage of potassium permanganate and sodium cyanide to 60-100 g/t and 60-70 g/t respectively, the original ore grade is reduced by 17%. The recovery rate of silver in lead concentrates reached 70.1%, while the grade of silver in zinc concentrates increased from 100 g/ton to 164 g/ton, and the silver recovery rate increased from 8.24% to 13.1%.

For water glass, it is believed that its inhibition effect on fine-grained lead minerals is poor, so that the lead in the lead-leaf copper process copper concentrate is 15%, and the recovery rate of silver in the lead separation operation is only 57.5%. In order to improve the effect of lead inhibition, increase the concentrated output of silver in lead, eliminate the water glass inhibition process, and replace the drug with a double chromate and lead-free copper. The recovery rate of silver in lead is increased to 79.55%. 22.05%.

The copper ore in Dexing Copper Mine is sensitive to lime. The separation of copper and sulfur in the mixed flotation is carried out in a strong alkaline medium with a free calcium oxide concentration of 800 mg/L or more. At this time, the copper ore is strongly inhibited and added. Sodium sulfite can alleviate the inhibition of copper, molybdenum , silver, gold, etc. by lime, and improve the separation effect of copper and sulfur.

The Bajiazi lead-zinc mineral silver mineral is suitable for flotation in a weakly alkaline slurry adjusted by sodium carbonate. Increasing the amount of sodium carbonate can increase the recovery rate of silver. When the amount of sodium carbonate is 3 kg / ton, the pH value is 8.5 (the natural pH of the pulp is 6.5), and the fineness of grinding is -200 mesh, accounting for 91.6%, the recovery index of silver is the best. When the tannin extract (100 g/ton) is selected, the grade of silver can be improved. The effect of tannin on the gangue and part of pyrite is better. The grade of silver concentrate is 1193 g/ton, and the recovery rate is 63.74%.

The use of dimethyl dithiocarbamate not only inhibits sphalerite and iron sulfide ore, but also activates galena and silver minerals, achieving very significant results.

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