Study on Comprehensive Recovery of Associated Metals in Tungsten Mine
First, the nature of the sample The sample is a sulfide ore mixed concentrate produced by a floating and flotation of tungsten coarse concentrate produced on site by a tungsten ore. Main mineral pyrrhotite, pyrite, copper ore, bismuthinite, Nature, bismuth China, bubble bismuth, arsenopyrite, gray silver ore, sulfur, silver bismuth and the like. The main component contents were (%): Cu 0.6, Bi 0.87, Ag 594 g∕t, S 32.7, Fe 44.65. Copper minerals are mainly chalcopyrite, accounting for 98%, and are floatable. Barium sulfide, natural earthworms and barium oxide account for 54%, 20% and 26%, respectively, and iron minerals are mainly pyrite, accounting for 83%. There are many kinds of minerals in the enamel, and the embedded relationship is complicated. In addition to the main stibnite, the content of natural strontium and strontium oxide is 46%. The stibnite mine is closely co-existing with natural strontium, chalcopyrite and pyrrhotite, and it is difficult to dissociate. Natural cockroaches have poor planktonic properties and are widely distributed in stibnite. Some yttrium ore deposits have yttrium oxide film attached to them, or are replaced by yttrium oxide, which causes a large difference in the sag minerality. Generally speaking, the strontium minerals in the samples are compared. Hard to choose. Silver is mainly present as an independent mineral. Monomers and bare continuum silver account for only 22%, and silver encapsulated in bismuth, copper and pyrite accounts for more than 70%, of which strontium minerals account for 43% and chalcopyrite accounts for 23%. Second, the process is determined The comprehensive recovery process of sulphide ore in production is as follows: mixed concentrate grinding to -0.074mm accounted for 60%, under the high alkali condition of pH=12, inhibiting pyrite and strontium mineral with lime, sodium sulfite and sodium cyanide, with a large amount of butyl The yellow drug is preferentially selected from copper; the copper tailings are activated by sulfuric acid, and then the sulphate concentrate is leached with hydrochloric acid, and the obtained sulfide ore concentrate is leached with hydrochloric acid to obtain oxychloride. There are two main problems in the production process. One is the use of sodium cyanide, which will cause pollution to the environment. The second is that the leaching residue contains 3% copper and 500g of silver, resulting in low recovery of copper and silver. The silver recovery rates are only 70%, 50% and 50% respectively. The chalcopyrite in the mixed concentrate is good in floatability, and the floatability of various niobium minerals is quite different. Some of them are relatively more buoyant. Therefore, it is possible to consider chalcopyrite and easy buoyancy first. Same as flotation. For the part of the non-floating strontium minerals, it is difficult to obtain qualified products by flotation method, and only the water smelting method is used for recovery. The test determined that the new process flow was: sulphide ore mixed concentrate grinding to -0.074mm accounted for 90%, at pH=9, adding a small amount of gangue inhibitor CX-1, using the collector ethyl sulphide (ie SN-9) # 2 oil and frother flotation of copper bismuth easy floating flotation section; mixed sulfide flotation tailings again difficult floated natural bismuth and bismuth oxide; mixed concentrate inhibition floating bismuth copper, copper concentrate to give qualified The floating copper tailings are enriched with most of the strontium sulfide minerals, combined with the strontium minerals obtained by the flotation flotation, and then copper is selected, and then the tailings are selected as the sorghum mine, which is leached by FeCl 3 . The process flow is shown in Figure 1, and the final test indicators are shown in Table 1. By this process, a copper concentrate containing 28.78% copper and a copper recovery rate of 90.72%, and an immersion liquid containing é“‹7.55g ∕L and é“‹ recovery rate of 81.33% can be obtained. The recovery rates of silver in copper concentrate and dip sulphur solution were 41.81% and 48.48%, respectively. The total recovery of silver is 90.29%. Table 1 Test indicators Figure 1 Flotation - Leaching New Process Third, discussion (1) Selection of partial hybrid flotation scheme Tests have been carried out on a high alkali inhibiting pyrite mixed flotation scheme and a copper ruthenium mixed flotation scheme (Table 2). In the high-alkali mixed flotation scheme, in order to inhibit pyrite, a large amount of lime and sodium sulfite (pH=12) are added, although the inhibitory effect on pyrite is obvious, but the niobium mineral is sensitive to lime and sodium sulfite, resulting in coarse The grade and recovery rate of the antimony in the concentrate are low. The partial mixing flotation process eliminates the need to add a large amount of lime (pH=9), and does not need to add sodium sulfite. The recovery rate of copper is 95.56%, and the recovery rate of hydrazine is increased to 46.3%. Moreover, such conditions are also beneficial for the recovery of the next step, therefore, it is preferred to use partial mixed flotation. Table 2 Comparison of partial mixed flotation and high alkali mixed flotation results (II) Effect of grinding fineness on partial mixed flotation The effect of grinding fineness on some mixed selection indicators is shown in Figure 2. As the fineness of the grinding becomes finer, the copper grade in the coarse concentrate is slightly lowered, while the grade of the tantalum is slightly increased, but the recovery rates of both copper and tantalum are improved. It can be seen that proper fine grinding is beneficial to the dissociation of the monomer, especially the monomer dissociation effect of the strontium mineral is more obvious. Figure 2 Effect of grinding fineness on partial mixing flotation (3) Partially mixed tailings vulcanization The loss rate of copper in mixed tailings is less than 5%, but the loss rate of bismuth is above 50%. Since the ore contains refractory natural strontium and strontium oxide, the natural bismuth-based stibnite-natural é“‹ 生 ä»¥åŠ ä»¥åŠ ä»¥åŠ ä»¥åŠ ä»¥åŠ ä»¥åŠ ä»¥åŠ ä»¥åŠ , , , , , , , , , , , , , , , , , , , , , Activation of the activator is difficult to effectively increase the hydrophobicity of the ruthenium, which is the main cause of high ruthenium loss in the mixed tailings. However, after sodium sulfide partial vulcanization and flotation, the recovery rate of rhodium can be greatly improved. 1. The effect of sodium sulfide on the selection of cesium. Sodium sulfide is added to some mixed tailings for vulcanization flotation, and a medium-floating mine produces tailings and tailings. The effect of sodium sulfide on strontium is shown in Figure 3. The results showed that with the increase of the amount of sodium sulfide, the niobium grade of the Yuzhong Mine was slightly improved, and the recovery rate of the alfalfa was significantly increased. However, the amount of sodium sulfide should not be too large, and the excess amount of sodium sulfide may have an inhibitory effect on strontium. Figure 3 Effect of sodium sulphide dosage on bismuth flotation 2. The effect of segmental vulcanization on selective helium. The sodium sulfide dosage test results show that excessive sodium sulfide can inhibit the strontium. Therefore, in order to prevent the adverse effects of excessive sodium sulfide, and to ensure the vulcanization of sodium sulfide to difficult buoyancy, the method of vulcanization of sodium sulfide is often used. The results in Table 3 also show that the staged vulcanization is better than the one-stage vulcanization. Table 3 Comparison of staged vulcanization and one stage vulcanization (4) Copper-bismuth mixed concentrate suppressing floating copper The use of lime and a small amount of modifier CX-2 in the copper-copper mixed concentrate can effectively inhibit the strontium minerals, increase the copper grade of the copper concentrate, and significantly reduce the strontium content in the copper concentrate. (5) Suizhong mine leaching The copper bismuth mixed concentrate inhibits the sputum floating copper tailings and the refractory fluorinated flotation concentrates merged into the é“‹ 矿 mine for leaching. 1. Effect of leaching agent concentration on leaching. FeCl 3 was used as the leaching agent. The relationship between FeCl 3 concentration and leaching rate is shown in Figure 4 when the liquid-solid ratio is 3:1, the leaching temperature is 80 °C, and the leaching time is 2 h. With the increase of FeCl 3 concentration, the leaching rate of silver and copper increased, while the leaching rate of bismuth was lower than that at 40g ∕L. The leaching rate of bismuth was higher at the other concentrations, and the change was not large. Figure 4 Effect of FeCl 3 concentration on leaching rate 2. The effect of leaching temperature. The leaching temperature test results are shown in Table 4. The results show that the leaching effect is poor at room temperature, and the leaching rates of silver and bismuth are low. Regardless of the FeCl 3 concentration of 80g / L or 150g ∕ L, increasing the leaching temperature has little effect on the leaching rate of bismuth, but the leaching rate of silver is significantly improved. Therefore, the leaching temperature should be 80 °C. Table 4 Leaching temperature test results 3. Comprehensive test of leaching. The leaching test was carried out according to the optimal leaching conditions (leaching temperature 80 ° C, FeCl 3 concentration 150 g ∕L, leaching time 2 h, liquid-solid ratio 3:1) by the flotation closed circuit. The test results are shown in Table 5. Table 5 leaching comprehensive test results Fourth, the conclusion The re-election of tungsten ore concentrates by sulphide or flotation produces sulphide ore mixed concentrates with complex composition, especially the variety of strontium minerals, and the difference in floatability. According to the characteristics of the sample, the flotation-leaching combined process, that is, the partial flotation flotation of copper and easy floating raft, the mixed concentrate inhibits the floating copper to produce qualified copper concentrate, the floating copper tailings and the mixed tailings sulfide flotation The foam products obtained from the refractory strontium minerals are combined and copper is re-selected. The re-selected tailings (ie, the sorghum mine) is leached with FeCl 3 to obtain satisfactory indicators. The process adaptability is strong. Compared with the production process, there is no longer any copper tailings and leaching slag that need further treatment, no sodium cyanide is used, and the recovery rate of copper, bismuth and silver is greatly improved. comprehensive recovery of metal ores associated effective process. Personal Care,Calf Massage Gun,Smart Neck Massager,Massager Fascia Massage Gun Shenzhen Unitepin Tech Co.Ltd , https://www.rifnylife.com