When dealing with arsenic gold ore, gold recovery often depends on the ability to float arsenic pyrite. The main purpose of this test is to determine the optimum conditions for the preparation of arsenic pyrite ore and flotation. The following gold-containing arsenic ores have been studied: FeAsS Â Â 2.2% ; FeS 2 Â Â Â Â 0.6% ; SiO Â Â Â Â Â 71% ; ( CaO+MgO ) Â Â Â 8.2% . According to the different behaviors of arsenic pyrite in grinding, stirring and flotation, experiments were carried out. In order to ascertain the degree of oxidation of arsenopyrite during the grinding process, 2 kg of ore was ground to 82%-0.074 mm, using a closed steel and ceramic grinding machine, respectively in an aqueous medium, soda solution and Grinding in a lime solution. The results show that when grinding with a ceramic grinding machine in a weakly alkaline ( pH < 9.0 ) lime and soda solution, the oxygen consumption does not exceed 50% of its original concentration ( 9.2 mg / liter). At this time, arsenic in the solution The content is 1~2 mg / L. In a more alkaline ( pH > 9.6 ) solution, the oxygen consumption increased to 85-90% , while the arsenic concentration increased to 10-14 mg / L (see Table 1 ). From the perspective of a steel mill, the oxygen requirement is about 80% in all the solutions to be studied . However, the arsenic content in the soda solution was 8 mg / l. At this time, the arsenic concentration in the lime medium - are generally small (about 0.8 mg / l). In the flotation machine, a solution of different alkalinity caused by lime or soda gives a fineness of 82% - Pre-purified by alkali. The arsenic content in the solution was measured with a colorimeter. The results shown in Figures 1 and 2 show that when the ore is highly neutral and weakly alkaline ( pH > 9.5 ), the concentration of arsenic in the solution is significantly increased, reaching 18 mg / liter in soda medium. And in the lime medium it is 26 mg / liter. Studying the planktonic capacity of arsenic pyrite (using amyl yellow If grinding with a ceramic grinder, it only takes 20 minutes to inflate, and the flotation of arsenopyrite can achieve the same effect. If grinding in soda media, the flotation rate is the fastest. These test results also demonstrate that arsenopyrite is not sufficiently oxidized in the preparation operation is also its low floating capacity under production conditions - reasons. Therefore, the soda solution is the best medium for preparing the ore before the flotation (that is, using a steel mill to grind in this solution, the oxygen concentration is also quite large). In order to prove this assertion, special experiments were carried out. Â Â The steel mill is equipped with a fixed component solution. The weight ratio of steel ball to solution is 6 : 1.5 . After the mill was rotated for 40 minutes, the oxygen content was measured. The test results in Table 2 demonstrate that most of the oxygen dissolved in the water is consumed in the oxidation of metallic iron in the mill. In alkaline lime solution and in caustic soda solution, the oxygen consumption is 80 to 98% of its original concentration . About Silicone Camera Case
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Flotation of gold-containing arsenic pyrite (1)