Arsenic-containing materials manufacturers: treatment methods for arsenic-containing fumes

　　Arsenic-containing materials manufacturer: In order to solve the problem of arsenic-containing fume and dust removal and comprehensive recovery of valuable metals, the invention provides a method of arsenic-containing fume and dust removal and comprehensive recovery of valuable elements applicable to the treatment of dust generated in the smelting process of non-ferrous metals. The patented technology of the present invention has the advantages of environmental protection, economy, energy saving and high resource utilization rate, and realizes the harmless of arsenic.

　　Arsenic-containing material manufacturers: The scheme of the patented technology of the invention is to remove soluble arsenic from the flue gas through leaching by atmospheric pressure alkali leaching, and catalytic oxidation of trivalent arsenic oxides as pentavalent arsenic, the oxidation solution is synthesized by lime arsenic precipitation process and highly stable solid minerals, and the leaching residue is washed, reduction smelting and oxidation by fluidization and conversion processes, so that each valuable element is recycled and used. The method removes and solidifies arsenic from the dust, while leaving as much as possible in the de-arsenicized residue of antimony, lead and bismuth to achieve the separation of arsenic and valuable metals without harm. The patented technology of this invention has high comprehensive utilization rate of resources, wide application of raw materials, and solves the pollution problem in the extraction process of traditional process, especially the soot produced in the smelting process of lead and zinc. The advantages of the method are more obvious.

　　Arsenic-containing material manufacturer: The invention relates to a method of removing arsenic from arsenic-containing soot and comprehensive recycling of valuable elements, comprising the following steps.

　　Arsenic-containing soot is studied by atmospheric pressure alkaline leaching process at room temperature ~ 100°C, leaching time 30 ~ 240min, liquid-solid mass ratio 3:1 ~ 20:1 (ml:g), NaOH concentration 0.1 ~ 6mol/L and stirring speed 50 ~ 1000r/min. The filtrate leach solution and leach residue; liquid-solid product mass ratio is the volume mass ratio of NaOH solution to arsenic-containing soot in ml/g; By catalytic oxidation, oxidation gas and catalyst were added to the leach solution obtained in step (1) to convert As3+ to As5+. Adjust the pH of the oxidation leachate obtained from step (2) to 1.5 ~ 3, add CaO and Ca(OH)2 or di-As arsenic precipitant in a continuous feeding manner, so that the molar ratio of Ca to As in the leachate is 2 ~ 8:1, the precipitation time is 5 ~ 100 hours, and the reaction temperature is 10°C ~ 90°C.

　　Arsenic-containing material manufacturer: In addition, iron salt solution was added to the reaction system obtained from step (3) and a neutralizer was added to control the reaction. Under the condition of pH 1.5 ~ 3, Fe3+ reacts with AsO43- to produce arsenic solid minerals with high stability, and the molar ratio of Fe / As in the reaction system is controlled at 1 ~ 5:1. Said iron salt solution is at least one of said iron sulfate solution, iron chloride solution or iron nitrate solution, and the neutralizer is at least one of said sodium carbonate, sodium bicarbonate or sodium hydroxide solution.

　　Arsenic-containing material manufacturer: the leaching residue obtained in step (1) is washed fluidly so that the soluble arsenic content in the leaching residue is reduced to less than 0.1%. The said liquid is returned to the leaching step (1) for the preparation of alkali leaching material; the washed residue obtained from step (5) is dried and mixed with charcoal, coal and an appropriate amount of soda ash. Reduction smelting is carried out in a reactor at 900 ~ 1200°C under the conditions of C and CO During the smelting process, bubble slag, lead-antimony alloy and dust are produced.

　　Arsenic-containing material manufacturers: return the dust to the reduction smelting or atmospheric pressure alkali leaching step; send the bubble slag to lead smelting; oxidation blowing of lead-antimony alloy under air-isolated flame conditions (preferably 650 ~ 800°C temperature) to obtain antimony vapor, blowing slag and crude lead; oxidation of antimony vapor to produce antimony trioxide as an antimony white product; return the blowing slag to the reduction smelting process; and crude lead is sent to lead smelting.