Microwave heating, solid state reduction and gaseous dephosphorization method for manganese ore powder

Abstract

The invention provides a method of microwave heating, solid-state reduction and gasification dephosphorization for manganese ore powder. The invention adopts a novel method of microwave heating, solid-state reduction and gasification dephosphorization against the characteristic of the manganese ore powder with high content of phosphorus. The method uses the manganese ore powder as a raw material, coal powder as reducing agent, and nitrogen as reduction and dephosphorization protecting gas to perform solid reduction and gasification dephosphorization in a reduction dephosphorization crucible, through raw material selecting, thinning, mixing, stirring and distributing, in an airtight microwave reduction dephosphorization furnace, in the nitrogen atmosphere, at a high temperature of 1390 DEG C, for 20 minutes to preserve heat and keep stand at constant temperature, so that the manganese ore powder can react with the coal powder and lime powder to prepare sponge ferromanganese powder; and manganese powder can be separated from phosphorus and hazardous substances via cooling, fine grinding and dry magnetic separation purifying. The yield of the sponge ferromanganese can reach 95 percent, the dephosphorization rate can reach 60 to 70 percent, and the phosphorus-containing rate is less than or equal to 0.15 percent. The manganese ore powder has the advantages of good reduction effect, high dephosphorization rate, short process flow and no environmental protection, and can be reused after phosphorus is collected.

Description

technical field [0001] The invention relates to a microwave heating solid-state reduction gasification dephosphorization method of manganese ore powder, which belongs to a method for removing harmful substances—phosphorus element from metal manganese ore powder. Background technique [0002] The abundance of manganese in the earth's crust is 0.13%, ranking the fifteenth, and the abundance of phosphorus in the earth's crust is 0.142%, ranking the eleventh, so it can be concluded that the abundance ratio of phosphorus to manganese is P / Mn is 1.092. [0003] There are many types of manganese deposits in my country, mainly sedimentary deposits, accounting for about 80%. The manganese ore is characterized by a relatively high phosphorus-manganese ratio. The phosphorus-manganese ratio P / Mn in manganese ores is mostly above 0.01%. The phosphorus-manganese ore ratio P / Mn of the manganese ore requires <0.003%, so the manganese ore in my country belongs to the high-phosphorus type...

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Problems solved by technology

[0005] There are also many forms of dephosphorization methods for manganese ore, such as: oxidation liquid reduction dephosphorization method, solid state reduction dephosphorization method, oxidation liquid reduction dephosphorization method is under the condition of low oxygen position, relying on dephosphorization agent CaSi-CaF 2 、CaAl-CaF 2 or CaC 2 -CaF 2 Dephosphorization of metal calcium in the slag, because the reduction dephosphorization slag contains a large amount of dephosphorization product Ca 3 P 2 When encountering moisture in the air, it will generate highly toxic gas phosphine trihydrogen PH3, which not only pollutes the environment, but also increases the difficulty of subsequent treatment of slag, and has not been widely used; the solid-state reduction dephosphorization method, the dephosphorization agent is metal magnesium , or a solution composed of Ca, Mg, Ba, Sr, etc. and halogen salts for dephosphorization. At a certain temperature, the solid ferromanganese powder is reductively dephosphorized, but due to the low mass transfer rate of phosphorus in the solid ferromanganese, the dephosphorization time It is not suitable for large-scale production; other dephosphorization methods, such as: strong magnetic reverse flotation method, strong magnetic smelting method, microbial method, reduction roasting ammonia leaching method, dephosphorization method outside the furnace, etc., also have many shortcomings and shortcomings. Further research on

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