Shi Daomin and other copper mines in the Tongshan copper mine of Daye, using a coarse two-sweep mixed flotation, mixed with alkaline pulp (Ding Huang Yao: Ethyl sulfide = 4:1) to obtain coarse concentrate, and then fine Grinding 96% -200 mesh, the copper and sulfur are fully dissociated, and the sulfur concentrate with sulfur content of 35.95% is obtained, and the low-grade pyrite is comprehensively recovered. Alvarez et al. studied the surface tension of minerals with methanol and studied the flotation separation of a chalcopyrite and pyrite. It was found that a volume fraction of 1% methanol and a small amount of S-701 collector were added to the slurry. With satisfactory results, this process can replace the conventional method of inhibiting pyrite by lime. At the same time, the use of methanol is advantageous for fine flotation, which provides another flotation process for muddy and over-pulverized chalcopyrite.
(2) Copper sulfide molybdenum ore
Nitrogen instead of air medium separation Copper molybdenum is widely used in the world copper and molybdenum plant. Nitrogen can prevent the oxidation of chemicals, especially Na2S, thus reducing the amount of Na2S. The Canadian Gibraltar Copper and Molybdenum Plant uses nitrogen medium to eliminate steaming. To reduce the amount of Na2S from 8kg/t to 2kg/t. Russia used non-polar collector HNOTPNH-3 instead of spindle oil to treat copper-molybdenum ore. As a result, the recovery rate of copper and molybdenum increased by 1% and 0.5%, respectively.
U.S. Patent describes a more complex secondary phosphate and a thio-bis xanthate acetate mixture, copper-molybdenum can increase the separation effect. Also introduced a copper-molybdenum ore preferential copper flotation process, adding sulfite ion and caustic starch to adjust the pH value of 5.2 ~ 6.2, after adding slurry to add alkyl dithio phosphite float copper, copper tailings plus coal oil is selected from molybdenum.
The research and application of organic inhibitors has also achieved great progress. Common low-molecular organic inhibitor consisting of alkanes (short chain), affinity group and a hydrophilic group composed of a solid, such as thioglycolic acid (sodium), mercaptoethanol, thio-uracil tetramethyl pilips oil and introduced to the Austrian side (ORFOM ) D series products for commercial brands. Due to the high price of such agents, large-scale industrial applications are still difficult.
(3) Copper sulfide nickel ore
Canada International Nickel's copper sulphur uses diphenyl hydrazine as a collector for chalcopyrite, and dextrin is used as an inhibitor of pentlandite for preferential flotation, which greatly improves selectivity. Nickel removal rate is less than that under the same conditions. The dextrin blank test was 50% higher.
Russia's Northern Nickel Company successfully applied electrochemical methods to treat high-ice nickel slurry, thereby improving the selectivity of copper-nickel flotation separation. Industrial test results show that the electrochemical treatment method can increase the production efficiency by 15% to 20%, and also reduce the nickel content of the copper concentrate and the copper content in the nickel concentrate.
Paper Machine headbox is the key of paper machine, it has three functions:
1. Spread the stock evenly along the width of the paper machine.
2.Accelerate the stock up to the machine operating speed.
3.Suspend the pulp fibers throughout the outgoing slurry.
The headbox use the air-cushioned type so that the work speed can be faster than the open-type.The enclose wall of the air-cushioned headbox is polished by the stainless steel.It have the stainless steel holy roll and use the tapered pipe inlet and organic glass diffuser headbox pulp.
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