F. Fumen other recovery of copper, nickel, cobalt, zinc and other valuable metals from the cinder success. At a temperature of 550 deg.] C, and prebaked on cinder 60min, then after prebaking cinder - pyrite mixture (ratio of pyrite slag 0.25) at a temperature of 550 deg.] C and then calcined 60min, the slurry The depth was 10% and leached with water for about 15 minutes at room temperature. Under these conditions, more than 95% of the copper can be recovered from Ergani primary converter slag and James Bridge secondary slag. More than 98% of the cobalt in James Bridge slag can be extracted. The cobalt, nickel and zinc extracted from the Ergani converter slag were 58%, 35% and 29%, respectively.

Wei Xiangsong introduced several methods for recovering non-ferrous metals in pyrite cinder. High-temperature chlorination roasting method: Calcium chloride is used as a chlorinating agent and uniformly mixed with calcined slag [(4～9):100], spheroidized and dried, calcined at 1100-1300 °C, copper, lead in the slag, Non-ferrous metals such as zinc are volatilized in the form of chlorides, which are recycled to the recovery tower, and the remaining slag, or pellets, is used for iron making. This method has certain requirements for the slag, that is, the content of FeO should be less than 3%, the arsenic should be less than 0.1%, the sulfur should be less than 0.7%, and the lead should be less than 0.2%. In addition, the content of copper and zinc should be certain. Within the scope. Japan Ltd. concentrate light household Tian recovery plant using this method for recovering copper pyrite cinders depositing copper 70%, 50% lead bismuth hydroxide and zinc, gold, silver and other valuable metals. Therefore, high temperature chlorination roasting is also called light and method. China's Henan Kaifeng Iron and Steel Plant uses this method to obtain a copper volatilization rate of 60% to 83%, zinc volatilization rate of 58% to 88%, sulfur volatilization rate of 67% to 98%; medium temperature chlorination roasting method: sulfur iron The ore slag, pyrite, and salt are mixed in a certain proportion in a furnace at 550-650 ° C for roasting and chlorination. The non-ferrous metal oxides and sulfides in the slag form soluble chloride or sulfate, which are cooled and cooled to a dilute acid. After leaching, copper, zinc, cobalt, gold, silver, etc. are separately recovered from the solution, and the residue is about 85% of the slag, and is used as a raw material for sintering. Leaching extraction method: pyrite containing higher cobalt, copper, cobalt, nickel, etc. in the preparation of sulfuric acid slag, mostly in the form of sulfate, soluble in water, leached with acid by air stirring, extraction with fatty acid by leaching solution Different metals are extracted under different conditions, and the remaining filter residue is still used as a raw material for iron making.

Sulfuric acid residues in order to avoid environmental pollution, as a raw material in sulfuric acid residues, by adding the active reducing agent (C6H12O6), with waste sulfuric acid leaching of iron and direct reduced iron yellow, and then to P204 (di-2-ethyl phosphate The main extracting agent is used to extract and recover copper from the immersion liquid, and the whole mud cyanide and zinc powder replacement process is used to extract gold and silver from the leaching residue, and the valuable metal in the slag is recovered and utilized economically and efficiently. The recovery rates of copper and gold reached 93.31%, 80.78% and 90.18%, respectively.

As an important element of life sciences, selenium has attracted more and more attention. A large amount of selenium is recovered from pyrite cinders abroad. During the production of sulfuric acid, the selenium in the pyrite is sublimed into gaseous selenium dioxide in a boiling furnace and dissolved in the washing acid. And the sulfur dioxide in the washing acid is reduced to monomer selenium. Selenium is deposited with the dust in the washing acid in a clarification tank, a collector and an acid cooler to form a slime. Selenium dioxide dissolved in the droplets is also reduced.

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