Method for restoring, roasting, purifying, and extracting manganese and iron by utilizing electrolytic manganese slag rotary kiln

Abstract

The invention discloses a method for restoring, roasting, purifying, and extracting manganese and iron by utilizing an electrolytic manganese slag rotary kiln. The method comprises the following steps of: adding manganese slag and coal gangue slag into a rotary kiln, wherein the adding quantity of the coal gangue slag is 5-10%; carrying out high-temperature roasting under a high-temperature environment inside the rotary kiln and the condition of negative pressure, so that sulphur, ammonia and nitrogen compound is decomposed into gaseous state, feeding the gases into a multi-pipe dedusting and tail gas treatment system to be removed along with the smoke; and carrying out the scavenging processes of ball-milling, first-stage low-intensity magnetic separation, second-stage high-intensity magnetic separation and third-stage high-intensity magnetic separation on the material restored by high temperature of the rotary kiln to obtain an iron product, a manganese product and a novel ultra-fine quartz powder, wherein the iron product is obtained after first-stage low-intensity magnetic separation, the manganese product is obtained after the second-stage high-intensity magnetic separation and third-stage high-intensity magnetic separation, and the final tailing is the ultra-fine quartz powder. The manganese and iron are extracted by the process disclosed by the invention; detrimental impurities are moved; the gas containing sulphur, ammonia and nitrogen is prepared into an ammonium sulfate fertilizer; and the tailing is prepared into the superfine powder as a building material. The afterheat is utilized; the energy is saved, and the environment friendliness is achieved.

Description

technical field [0001] The invention relates to a method for harmless and comprehensive utilization of electrolytic manganese waste slag in a rotary kiln through high-temperature rapid reduction roasting to remove impurities and extract manganese and iron. Background technique [0002] The existing electrolytic manganese waste residues are divided into three types: one is filter acid residue produced in the production process of electrolytic manganese metal, the other is a large amount of ore waste residue produced in the mining process, and the third is dressing plant tailings residue and smelting waste residue. In my country, electrolytic manganese waste slag belongs to Chinese characteristic waste slag, and the relevant research is basically blank. Few people abroad have studied it. Because electrolytic manganese waste slag has high viscosity, high water content, and low active components, it is basically an inert material and is quite difficult to use. Due to backward tec...

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Problems solved by technology

Although the trace elements contained in the electrolytic manganese waste residue can be used, but due to the low element composition, the recovery is difficult, there are many harmful impurities, the separation cost is high, and the current situation of comprehensive recovery is not ideal. It can be used as manganese fertilizer, cement retarder or as auxiliary road materials and bricks to be stacked and landfilled. However, due to the huge discharge of manganese slag, it is quite difficult to completely transform it in a short period of time. Comprehensive recovery of electrolytic manganese waste slag, complex solid mixture The harmless removal of harmful elements and the harmless treatment of electrolytic manganese waste residue are urgent and important tasks. It is also listed as the "Bulk Industrial Solid Waste Treatment and Recycling Technology" in the field of resource and environment technology (environmental part) of the National 863 Plan. , "Industrial Waste Gas Purification and Recycling Technology", "Contaminated Soil Remediation Technology" major research topics

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