Copper separation process (sulfide ore treatment) (2)

In the mountains of non-ferrous metal mining research company incorporated Valley copper mine ore characteristics and the actual production situation, the branch of the flotation process and flotation rougher concentrate regrinding technology combine to achieve the improvement of concentrate grade and reduce drug consumption purpose.
Dajing Silver Copper Mine is a refractory complex polymetallic deposit dominated by silver, copper and tin . The copper minerals mainly have chalcopyrite, and the granules are thicker, generally 0.043~1 mm, and +0.074 mm accounts for about 88%. Silver is mainly present in the form of independent minerals in the ore. It is fine-grained, generally below 0.040 mm, and rarely reaches 0.060 mm. The majority of tin minerals are cassiterite, and a very small amount is in the form of bismuth tin ore in the chalcopyrite or at the edge thereof. The particle size is finer, accounting for 43% of the 0.02-0.1 mm grain size. Arsenic is present mainly in the form of arsenopyrite ore, followed by arsenic pyrite, coarse-grained. The ore content of copper, silver and tin is relatively high and is the main object of recycling.
Through the experimental research, the Beijing Research Institute of Mining and Metallurgy proposed to use the flotation-re-election combined process to recover three metals: silver, copper and tin. The process structure is shown in Figure 6.

Figure 6
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When silver copper is preferentially selected, sodium thiosulfate and zinc sulfate are used as inhibitors of arsenic-containing minerals and pyrite, and butylammonium black and aniline black are used as collectors, and lime and ammonium chloride are used in the selection. Arsenic can obtain better technical and economic indicators. The dosage of the agent is shown in the table below. The results of the small closed circuit test are shown in the table below.

Guangdong Institute of Technology uses a sulphide ore provided by a tungsten plant to conduct a comprehensive study on the recovery of its useful components. Experimental studies show that smelt joint process, i.e., leaching recovery of bismuth, lead, silver selection with FeCl _3, with sulfite - limestone from FeCl ₃ method leach residue flotation recovery of molybdenum, copper, arsenic, sulfide ores can The various useful ingredients are fully and reasonably utilized.
The sulfide slag after leaching of FeCl ₃ contains 6.51% copper, 9.46% arsenic and 34.83% sulfur. The analysis results of slag phase composition indicate that the copper mineral is chalcopyrite, the arsenic-containing mineral is arsenopyrite, and the sulfur-bearing mineral is mainly pyrite.
The separation of chalcopyrite from arsenopyrite and pyrite by the sulphite-lime method is based on the fact that sulphurous acid can effectively inhibit the toxic sand and pyrite in the weakly acidic pulp dissolved in lime, and the chalcopyrite is not inhibited. Instead, it can promote its floating. This duality of sulfite has a high selectivity for copper and arsenic sorting.
The test results show that in weakly acidic pulp (pH=6.5~7), sulfuric acid and lime are used in combination with arsenopyrite, pyrite inhibitor, butyl xanthate and sulphate are mixed as collector flotation brass. The mine can effectively separate the brass from the arsenopyrite and pyrite, and can obtain good sorting results. At lower pH (pH=5.5~6), it is based on sulfurous acid to arsenopyrite and pyrite. Inhibition of the difference in the program, in the tailings after copper floating, using sulfite as a regulator, butyl xanthate as a collector flotation of pyrite, can be separated from the pyrite and pyrite, and can be qualified Arsenic concentrate.
The test procedure and the pharmaceutical system are shown in Figure 7. The indicators obtained are shown in the table below. [next]

Figure 7

Pretreatment of the leaching slag, strict control of the pH value of the slurry, strong agitation scrubbing of the slurry before flotation, to remove the contamination of the mineral surface by the heavy metal ions entrained in the slag, and the oxidative deterioration of the surface of the leaching slag. Choosing the appropriate amount of sulfite, maintaining a certain amount of free calcium oxide in the slurry, controlling the action time of sulfurous acid, is an important process condition of the sulphite-lime method, and is also effective separation of chalcopyrite and arsenopyrite, reducing copper concentrate Effective measures for arsenic. [next]
The Leiping non-ferrous metal mine in Zhangzhou, Hunan Province belongs to the copper-bearing polymetallic ore. Metal minerals include: chalcopyrite, porphyrite, arsenopyrite, sphalerite, cassiterite, pyrite, and pyrrhotite. Gangue minerals are: calcite, quartz, diopside, tremolite, fluorite, actinolite, chlorite, sericite, hornblende, talc, mica and the like. The ore contains 0.6~0.7% copper, 3.5~4.5% arsenic, and 6~7% high.
Since the mine processing plant production, with copper-based mineral, grade copper concentrate which is generally 12 to 16% and the recovery was about 80% copper, arsenic in copper concentrates more than 2%, the product not sell.
The mine considers that the ore contains relatively low copper and contains high levels of arsenic; the separation of copper minerals from arsenic pyrite is more difficult. In order to improve the copper concentrate grade and reduce the arsenic content of harmful impurities, the crude, three-precision and three-sweep of the original float copper process were changed to one coarse, five fine and four sweeps. At the same time, increase the amount of lime and add it in four stages. Originally, only lime was added to the ball mill and selected. The consumption per ton of raw ore was 4~5 kg, which increased to 8~10 kg per ton of raw ore. The added point was 1.5~2 kg/ton for ball mill; 2.5~3 kg/ton for blender; Select II, select III total 4 ~ 5 kg / ton; rough selection pH from 8 ~ 8.5 to 9 ~ 10. The copper concentrate grade was increased by 5.16%, while the arsenic was reduced to less than 0.5%. On the other hand, the operating conditions are improved, the grinding fineness is improved, and the amount of the collector and the foaming agent is strictly controlled by rough selection.
Through the above measures taken, good results have been received. In 1981, the copper concentrate grade and copper recovery rate were 22.57% and 86.72%, respectively, while the copper concentrate contained 0.42% arsenic.
Hunan Metallurgical Research Institute used flotation method to study the separation of copper sulfide minerals and arsenopyrite from skarn copper-tin ore.
Test sample ore produced in the granite and marble dolomitic contact zone belonging to the high temperature magnesium-sand rock deposit. The main ore-bearing copper-bearing minerals are mainly chalcopyrite. Arsenic minerals are mainly composed of arsenopyrite, with a small amount of sulfur-arsenic copper ore and arsenic-copperite; the poisonous sand is closely embedded with the main primary sulfide minerals, and the content is high, and it is widely distributed in various ores. There are many kinds of gangue minerals, such as quartz, feldspar , phlogopite, sericite, chlorite, iron dolomite, dolomite, calcite, actinolite, tremolite, and hornblende.
Experimental study on separation of copper and arsenic: separation of copper and arsenic refers to the separation of chalcopyrite, chalcopyrite, porphyrite and arsenopyrite. The toxic sand is similar in nature to iron sulphide, so the separation of copper and arsenic also includes separation from pyrite .
The floatability of copper sulfide minerals, arsenopyrite and pyrite is not much different. When copper is preferentially flotation, attention must be paid to the selection of collectors with good selectivity and strong harvesting power. The test proves that propyl phthalate is strongly adsorbed on the surface of copper sulfide mineral, which is suitable for multiple selection of strong alkali medium.
Inhibitor Selection: Sulfur ions can form poorly soluble precipitates with heavy metal ions, thereby eliminating the effects of these ion activations. The rough selection process uses sodium sulfide in combination with lime to achieve good separation. In the selection process, when sodium sulfite is used together with lime, the separation effect is significantly improved.
Increasing the number of selections significantly reduces the arsenic content of copper concentrates. This is because the multiple inhibitions cause the arsenopyrites to lose or reduce the planktonicity and achieve the purpose of inhibiting arsenic minerals.
The re-grinding of the coarse concentrate further fully dissociates the copper minerals from the poisonous sand pyrite ore, and also acts to scrub the surface of the ore particles, which is beneficial to the inhibitors to fully inhibit the arsenopyrite and create copper and arsenic separation. And the favorable conditions for improving the copper recovery rate not only make the final copper concentrate contain arsenic to meet the predetermined requirements, but also increase the grade by 5.49% and the recovery rate by 2.72%.
Taking the above measures will not only effectively reduce the arsenic content of copper concentrate to less than 0.3%, but also help to improve the copper concentrate grade and recovery rate. The closed circuit test procedure is shown in Figure 8 below, and the test results are shown in the table below.

Figure 8

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