Praseodymium nature only one stable isotope, 141-Pr. However, there are 38 radioisotopes, of which 143-Pr is relatively stable with a half-life of 13.57 days and 142-Pr with a half-life of 19.12 hours. Other radioisotopes have a half-life of more than 5.985 hours, with most half-lives less than 33
Read more1. Uranium ore mixed acid ripening heap leaching process The ore is crushed to <8mm, mixed with a thicker (>50%) acidic leaching agent, first placed at room temperature for a period of time to allow the leaching agent to penetrate into the ore and fully contact with the mineral; The state of
Read moreLocated in Deqin County, northwestern Yunnan, Yangla Sulfide Copper was discovered in the 1970s and is located in a small copper mine. With the further development of geological work in recent years, a significant increase in the total reserves of the metal, identified as large-scale copper mine. H
Read moreFirst, the main reaction and its thermodynamic conditions (1) scheelite The reaction of white cast iron carbonate leaching is: (1) According to the measurement, the concentration equilibrium constant Kc and the activity equilibrium constant Ka of the reaction formula (1) are shown in Table 1. F
Read more(A) coal processing and utilization through a series of processing technology, improve product quality, to produce varieties adapted to the different needs of the use of coal sectors, coal resources to be efficient and clean to create conditions. 1. Coal preparation Includes screening and coal pr
Read moreUnder the calcination conditions of 200 to 240 ° C, concentrated sulfuric acid can effectively decompose monazite. The rare earth, lanthanum and uranium in the decomposition products are present as RE 2 (SO 4 ) 3 , Th(SO 4 ) 2 and UO 2 SO 4 , respectively . Sodium carbonate is mixed with monazit
Read moreIron concentrate flotation desulfurization process: harmful impurities in iron concentrates are generally in the form of pyrite and pyrrhotite. Sulfur in the form of pyrite can be removed by flotation or magnetic separation of xanthate In addition, sulfur in the form of pyrrhotite is difficult to r
Read moreThe structure of the trough feeder is relatively simple, as shown in the figure below. It can be installed either on the ground or at the discharge opening of the silo. The bottom of the trough feeder is 20 to 60 times per minute and the stroke is 20 to 200 mm. The stroke can be properly adjusted b
Read more1. The comprehensive utilization technology and process of feldspar minerals The main deposits of feldspar are pegmatite, weathered granite , fine-grained rock (semi-weathered granite), in addition to feldspar pottery, potassic rhyolite, and snake rhyolite associated albite, nepheline diorite white
Read moreThis bit is a hard alloy columnar shape and showed a new spot embedded in the drill bit body. As shown in Figure 1. Figure 1 cylindrical tooth drill The advantage of this kind of drill bit is that the blast hole is easy to open the door, it is difficult to get stuck, the blasthole is round, the d
Read moreI. Introduction The average vanadium content in the crust is 0.015%, more than copper, nickel, zinc, tin, cobalt, lead and so on, but mainly due to the nature of vanadium to trivalent form is present, and the ionic radius of trivalent vanadium and trivalent The ionic radii of aluminum and ferric i
Read moreZhaoyuan gold-containing copper smelter processing high (2.09%) of sulphides gold concentrate. Direct cyanidation gold extraction consumes a large amount of cyanide and the gold recovery rate is low. Using roasting - sulfuric acid leaching - cyanidation leaching residue to extract gold silver, gold
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