Sulfur production in recent years time Sulfur grade (%) Recovery rate(%) Raw ore Copper tailings Sulfur concentrate Tailings 1981 27.2 23.56 26.32 19.73 42.17 1982 (January-June) 29.25 25.45 27.82 21.72 41.87 It is generally believed that the inhibition of lime on pyrite is caused by the interaction of OH with the mineral surface to form a hydrophilic iron hydroxide film, and Ca 2+ also has a significant inhibitory effect on it. Therefore, to resurrect it, it is necessary to destroy the iron hydroxide film or to dissolve it, or to peel it off, or to convert it into a hydrophobic film.  "Sewage" ingredient list  Content (mg/L) copper iron lead Zinc chromium arsenic cadmium HG fluorine PH Waste rock pile water (1) 421 3000 1 14.9 <0.02 16.25 6 0.01 6 2 Waste rock pile water (2) 982 6360 1.2 73 0.125 38.75 1.1 <0.006 11.98 2 Small test water 900 15230 　 　 　 　 　 　 　 1.5 Industrial test water 266.07 784.31 1.25 90.09 　 　 　 　 　 1.5 Acidic sewage contains a lot of iron ions, a small amount of copper ions, and other cations are very small. In alkaline pulp, iron ions do have a good revitalization effect on the pyrite-reduced pyrite. After the addition of Fe 3+ in the slurry, Fe(OH) 3 precipitates immediately, and the newly formed Fe(OH) 3 is formed. It is a good agglomeration agent and has a strong co-precipitation effect. It can be considered that due to the agglomeration of the new iron hydroxide, Ca 2+ is adsorbed and co-precipitated, and the mineral surface is cleaned. Therefore, when sewage or ferric sulfate is added, When the solution is lowered to a pH of 10 to 11, most of the pyrite is activated. date Types of Dosage amount (g / ton) PH project Weight (tons) Yield(%) Sulfur grade (%) Sulfur content (tons) Sulfur recovery rate (%) June 1982 Industrial test Sewage: 1.0M 3 /H 6~8 Raw ore 3275.69 100 29.28 59.06 (127L/T) Copper concentrate 1160.35 35.42 41.6 480.93 Na 2 S2000 Copper tail 2115.34 64.58 22.6 478.13 100 Ding Huang Yao 200 Sulfur concentrate 1137.15 34.72 35.19 400.12 83.63 2 # 油120 Tailings 978.19 29.86 7.97 78.01 16.32 Acidic sewage is used instead of sulfuric acid to adjust the pH value of the slurry, and sodium sulfide is used as an active agent to activate the pyrite which is inhibited by a large amount of lime. It has been proved by a small test and industrial test that it is a good effect, simple process and economical method. Another significant advantage is the conversion of industrial wastewater into industrial chemicals, and this part of the sewage has been qualified in the production process. It can be seen from the following table: various fine metal ions in the sulfur concentrate overflow water and tailings water The sedimentation is complete and meets the emission standards, which opens up a new way for the treatment of acid sewage in mines. Metal ion content table (mg/L) in tailings and concentrate water Numbering project copper cadmium iron arsenic chromium lead Zinc HG fluorine PH NS-307 Sulfur concentrate overflow water 0.1 mark mark mark mark mark mark / / 9.6 NS-302 Tailings water mark mark mark mark mark mark mark / / 6.6 Xinxing County Copper Mine uses propionic acid propionitrile ester (OSN-43) as a copper collector , and this will strengthen the comprehensive recovery of pyrite . The enterprise will get rid of losses and the economic benefits will be significantly improved. Bimetallic conical twin barrel and screw Conical Twin Screw Barrel Extrusion Machine,Conical Extrusion Screw,Extrusion Machine Conical Screw Barrel ZHEJIANG JINJIA PLASTICS MACHINERY CO., LTD , https://www.jinjiascrew.com
North Wushan Copper ore zone is a copper pyrite deposit types, under the broad mesothermal skarn deposits, recently mined ore is of secondary enrichment zone. Such metal ore mainly pyrite minerals (including gum pyrite), followed by chalcocite and vitriol. Non-metallic minerals are mainly quartz , followed by kaolin , hydromica and montmorillonite.
The preferred flotation process used in the plant selection is to select the copper and then select the sulfur. The pH of the copper tailings is between 12.2 and 12.5, and the slurry concentration is about 12%. Because the ore is easy to oxidize. In order to restrain them from floating, the amount of lime added in the selection of copper is 20 kg / ton of ore, the iron sulfide minerals are severely inhibited, and the production index is not good. The production indicators in recent years are shown in the following table.
Sulfuric acid is an effective activator commonly used in industry. Its activation mechanism is to dissolve the iron hydroxide film on the surface of minerals. The activation is reliable and stable. However, the slurry with large amount of lime is not economical and has corrosive effects on equipment. Associated with toxic gases, which pollute the environment. In theory, it should be possible to use mine acid sewage instead of sulfuric acid. The sewage from the waste rock heap in the northern ore belt of Wushan Copper Mine is an acidic solution with a large amount of sulfate. The composition is shown in the table below.
The use of "sewage" instead of sulphuric acid has been proved by small tests and industrial tests. The test results are shown in the table below. [next]
The main metal minerals in the ore are chalcopyrite, copper blue, blue copper, copper oxide and copper sulfate, followed by pyrite and sphalerite. The ore is subject to different degrees of weathering and alteration, loose and brittle, viscous, and contains many mud (-200 mesh up to 37.88%), which is easy to produce a large amount of copper ions to interfere with flotation.
On-site production process: high alkali and sulfur suppression, with the yellowing agent plus Dinghuang (4:1) as the mixed collector priority floating copper, using a rough selection, three selections, three sweeping process. A small amount of low-grade pyrite is recovered from the tailings by means of a "slot" method.
Medication conditions: lime 27 kg / ton, ethyl xanthate plus butyl xanthate (4:1) 100 g / ton, No. 2 oil 50 g / ton, depending on the situation of the original ore, sometimes need to add appropriate amount of sodium silicate, vulcanization Sodium, zinc sulfate, etc.
Production index: From 1972 to 1982, the ore content averaged 1.19% copper, sulfur 10, copper concentrate grade 9.7%, recovery rate 55.07%, sulfur concentrate grade 25%, recovery rate around 25%.
The experiment was carried out with the use of propionate propionate as the collector float copper. The preliminary comprehensive selection conditions were: raw ore grinding - 200 mesh accounted for 80%, lime 5 kg / ton, pH = 8.
Floating copper: crudely selected l-butyric acid propionitrile ester 12 g / ton, Ding xanthate 1.2 g / ton, crudely selected II butyl sulphate propionate 6 g / ton, Ding xanthate 1.2 g / ton. Selected I luterin propionate 3 g / ton, Ding xanthate 2.5 g / ton. Selected II butyl succinate propionate 3 g / ton, Dinghuang medicine 0.5 g / ton. Sweeping butyl phthalate propionate 6 g / ton, Ding xanthate 1.2 g / ton.
Sulfur was selected: Dinghuang medicine 400 g / ton, No. 2 oil 50 g / ton.
Technical indicators: copper concentrate grade 11.03%, recovery rate 80.41%, sulfur concentrate grade 38.54%, operation recovery rate 98.74%.
Tests have shown that the use of propionate propionate as a copper collector, in the case of preferential float copper, even in the case of complex copper ore and pyrite is activated by copper ions, it can also be in weak alkali medium In the middle, it is not necessary to use excessive lime (sodium sulfide, cyanide, etc.) to suppress sulfur in advance. When sulfur is selected, it is not necessary to add a large amount of sulfuric acid for neutralization, and the grade and recovery rate of copper are also improved.
The mine timely promoted the research results on the spot, produced good results, saved the cost of chemicals, increased the production of pyrite, improved the recovery index of copper, and enabled the copper mines in Xinxing County, which had serious losses, to turn losses into profits. The economic benefits will be significantly improved.
Industrial test and a year of production practice has proved that the adjusted reagent system significantly improved the effect of copper zinc, copper concentrate sales to meet the quality requirements. Mainly the improved pharmaceutical system increases the proportion of sodium sulfide. In addition to ensuring the formation of sodium sulfide colloids as a "colloidal inhibitor", the remaining sodium sulfide remains in the pulp. According to the Japanese scholar Mizu Liming, the inhibition of sodium sulfide not only reduces the concentration of copper in the slurry, but also reduces the adsorption of xanthate on the surface of the sphalerite activated by copper ions, and removes the yellow adsorbed on the surface activated by copper ions. The drug, and also has a certain role in removing the copper sulfide film formed on the surface of the sphalerite, strengthening the inhibition of zinc minerals.
September 28, 2024