![]() ![]() Depending upon the mineralogy of the ore, other auxiliary reagents may also be required to depress sulfides which tend to float with and thus lower the grade of the stibnite concentrate. The classifier overflow adjusted to a pH of approximately 7.5 to 7.8 is conditioned with a stibnite activator such as copper sulfate or lead acetate and a collector such as Z-11 or a liquid type Aerofloat. Thus, overall plant recovery may be increased by reducing slime losses due to overgrinding of the soft, high specific gravity stibnite. However, in certain instances a Unit Flotation Cell may prove particularly effective in that it is capable of recovering a significant portion of the total stibnite as a relatively high grade grannular concentrate. A Unit Flotation Cell has not been included in the ball mill-classifier circuit of this study. Normally the sampling interval is one cut each 15 minutes which is collected each shift as a composite sample. If necessary sufficient lime or soda ash should be added to the ball mill feed to provide the proper pH for subsequent conditioning and flotation operations.Ī head-ore sample is cut from the classifier overflow to use as the flotation circuit control and metallurgical balance. To reduce overgrinding of the friable stibnite it is generally desirable to carry a relatively large circulating load in the ball mill-classifier circuit. Fine grinding is accomplished in a Ball Mill operating in closed circuit with a Spiral Classifier. The crushed ore is fed from the fine ore storage bin at a controlled rate by a Adjustable Stroke or Variable Speed Ore Feeder. Removal of tramp iron to prevent damage to the secondary crusher is accomplished with an electromagnet and a magnetic head pulley. Removing the fines with a grizzly before the jaw crusher and with a vibrating screen ahead of the secondary crusher increases the efficiency of size reduction since the crushers are working only on material that must be reduced. It is designed to permit crushing sufficient ore during one 8 hour shift to operate the mill during a full 24 hours. ![]() The crushing section with two-stage reduction is suitable for tonnages of from 100 to 300 tons of ore per 24 hours. The talc mineral is particularly trouble some since it tends to float with the stibnite and hence lowers the grade of the final antimony concentrate.īeing a small operation every economy must be utilized to assure maximum operating profits. The gangue is composed largely of quartz but contains, in addition, a small amount of talc. The antimony in this study occurs as the mineral stibnite (Sb2S3) in association with small amounts of pyrite, arsenopyrite, galena and lead sulfantimonides. The problem discussed in this antimony process study is limited to a concentrator capable of beneficiating 150 tons per day of antimony ore. ![]()
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