Fodamon engineers continue to share the other four flotation methods of beneficiation process of lead zinc oxide ore in this article.
1.2. Sulfuration amine flotation method
The sulfurization amine flotation method, also called Rey method, was first discovered by Maurice Rey and his assistant, and proved that the primary amine collectors were the most effective. At present, sulfide amine flotation has become the main method of flotation of lead-zinc oxide. Most of the domestic lead-zinc oxide concentrators adopt sulfide ammonium flotation. The process does not need to be heated and sulfurized, and excessive sodium sulfide will not significantly inhibit the subsequent flotation. Chen Jinquan et al. Carried out sulfurization amine salt flotation test on a high-speed iron slime lead-zinc oxide mine. Using sodium sulfide as sulfurizer and mixed amines (dodecylamine, cetylamine and octadecylamine) as collector, under the conditions of lead-zinc feed grade of 3.54% and 5.86%, the flotation indexes of lead concentrate grade of 45.23%, recovery rate of 73.51%, zinc concentrate grade of 40.56% and recovery rate of 76.21% were obtained. Li Yuqiong et al. Recovered zinc oxide from a zinc oxide ore in Pu’er of Yunnan Province by sulfurization amine flotation method after pre desliming before grinding. With sodium sulfide as sulfurizer and octadecylamine as collector, the grade of original zinc ore was 6.08%. After one roughing, three cleaning and three scavenging, the grade of zinc concentrate was 37.21% and the recovery rate was 64.97%. Amine collectors have good selectivity to lead and zinc, and their separation index is better than sulfurization xanthate method. However, there are some shortcomings in sulfurization amine salt flotation: it is sensitive to slime and soluble salt, poor selectivity to gangue minerals with easy sliming in raw ore, and large dosage of reagents. The actual production needs desliming and sulfuric acid cleaning and activation, which will make a lot of zinc metal loss and process complexity.
1.3. Flotation of fatty acid collectors
Fatty acid collectors are widely used in the flotation of silicate minerals, phosphate minerals and other oxidized ores, which can be directly used in the flotation of zinc oxide, can also be used in reverse flotation to remove carbonate and sulfate from concentrate, and improve concentrate grade.
French j.m.cases and others first applied the fatty acid process to the flotation of lead-zinc oxide ore containing silicate gangue, and used this process to treat sanguinide (sanguinete) lead-zinc oxide ore, through sulfide xanthate flotation of white lead ore, using Na2CO3 and Na2SiO3 to inhibit the silicate gangue mineral, using oleic acid to directly flotation of smithsonite, and finally obtained the grade of 44.60% zinc concentrate, recovery The rate is 84.50%. Ye Junjian et al. Used the combination collector of fatty acid collector FA-1 and GA-1 when butyl xanthate or amine collector GA-1 had no effect on the collection of smithsonite in the ore. when the zinc grade of the ore was 8.90%, the zinc concentrate grade was 22.59% and the zinc recovery rate was 74.03% after one roughing.
Although the research on the flotation of oxidized lead-zinc ores by fatty acids began in the 1920s, the selectivity of fatty acid collectors to gangue minerals is poor, and the separation effect of oxidized lead-zinc ores containing carbonate and sulfate gangue minerals is very poor, especially the high iron oxide lead-zinc ores is more difficult, so far it is not widely used in industry.
1.4. Chelating agent flotation method
Chelating agent collector has been paid more attention because of its high selectivity and strong collection ability. Wang Lun et al. Used the zinc oxide ore of Pu’er county to carry out the flotation test of SALICYLALDOXIME, an organic chelating agent, and used a flotation process to obtain the zinc concentrate with a grade of 37.07% and a recovery rate of 73.92%.
Tan Xin et al. Studied the collection performance of CF collector for smithsonite, white lead mine, calcite, dolomite, quartz and limonite, and found that CF has good collection performance for smithsonite and white lead mine, while the effect of calcite, dolomite, quartz and limonite is weak. When CF is used as collector, sodium hexametaphosphate and zinc sulfate sodium silicate can effectively inhibit the flotation of gangue minerals such as calcite.
In the pulp with normal temperature and natural pH value, smithsonite, galena and gangue minerals can be effectively separated without the alkaline environment like xanthate and amine collectors, and the reduced sulfuration process improves the operability, saves a lot of energy consumption and sodium sulfide agents. The disadvantages of low flotation index, high reagent consumption and high operation cost due to the poor selectivity of xanthate and amine collectors are avoided. Due to the high price and relatively short development time of chelating agent collector, the stability and theoretical research still need to be further improved, which has not been widely used in production.
1.5. Flocculation flotation method
The main reason for the low flotation index of lead-zinc oxide ore is that the loss of lead-zinc oxide ore in fine particles and slimes is more. After adding the selective flocculant, the fine-grained lead-zinc oxide minerals agglomerate into larger particles, which improves the floatability and realizes the separation of fine-grained gangue minerals, and effectively improves the recovery rate of lead-zinc metals.
Ms. Han has carried out a study on the medium scale flocculation flotation of a deep oxidized lead zinc ore in Henan Province. The zinc oxidation rate of raw ore is 92.3%, the lead oxidation rate is 90.4%, and the primary slime is 16.8%. With carboxymethylcellulose as flocculant, the flotation principle of lead first and zinc second was adopted. Finally, lead-zinc concentrate with grades of 49.83% and 40.75% was obtained, and the recovery of lead-zinc was 42.26% and 81.64%, respectively. The grade of zinc concentrate is more than 30% and the recovery of zinc is 64%.