Method for producing ferric phosphate by dephosphorized converter slag
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An iron phosphate and slag technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of insoluble, incomplete, undisclosed alloys, and P, Fe oxide impurity content, etc., to reduce the harmfulness , the effect of high added value
Active Publication Date: 2018-12-25
UNIV OF SCI & TECH BEIJING
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Phosphorus in dephosphorization slag is mainly in the form of 2CaO·P 2 o 5 and 3CaO·P 2 o 5 The form exists in the calcium silicate phase, and it is difficult to dissolve in the acid-base environment, so it is impossible to directly use the dephosphorization slag to produce iron phosphate
Patent Nos. CN101844756 B and CN 101898757 B introduced the method of reducing steel slag and obtaining Fe-P alloy through magnetic separation, and Fe-P alloy was roasted in air to obtain P and Fe oxides to prepare LiFePO4 precursor. The magnetic separation of slag and metal is costly and incomplete, and the impurity content of the obtained alloy and P and Fe oxides are not disclosed, and the index detection and analysis of the prepared LiFePO4 material is not carried out
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Embodiment 1
[0009] Embodiment 1: containing P 2 o 5 Dephosphorization slag treatment process with a mass fraction of 5.2%
[0010] The specific composition of dephosphorization slag is as follows:
[0011] Element
[0012] Treat 10 tons of dephosphorized slag with the above components in an electric arc furnace, and add 1200kg of silica (containing SiO 2 =95%, CaO=5%), the slag obtained at this time has a basicity of 1.20, and then adds coal powder (containing 80% of fixed carbon, 10% of volatile matter, and 10% of ash) to it, and the excess coefficient is 1.2. The added amount is 1350kg, and the melting reduction is carried out under the condition of 1350°C.
[0013] The composition of the obtained slag is similar to that of blast furnace slag, and it can be used as cement raw material after water quenching. The specific composition is as follows:
[0014] Element
[0015] Obtain a total of 2435.0kg containing P=3.28% high-phosphorus molten iron, and the compositi...
Embodiment 2
[0020] Embodiment 2: containing P 2 o 5 Dephosphorization slag treatment process with mass fraction of 7.5%
[0021] The specific composition of dephosphorization slag is as follows:
[0022] Element
[0023] Treat 10 tons of dephosphorized slag of the above composition in an electric arc furnace, and add 1400kg of iron tailings (containing SiO 2 = 60%, Fe 2 o 3 =30%, Al 2 o 3 =10%), the slag system alkalinity obtained at this moment is 1.20, and then is mixed into coal powder (containing fixed carbon 80%, volatile matter 10%, ash content 10%) wherein, excess coefficient gets 1.2, and add-on is 1400kg, Smelting reduction is carried out at 1350°C.
[0024] The composition of the obtained slag is similar to that of blast furnace slag, and it can be used as cement raw material after water quenching. The specific composition is as follows:
[0025] Element
[0026] Obtain simultaneously the total 2288.6kg of high-phosphorus molten iron that contains P=4...
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Abstract
The invention discloses a method for producing ferric phosphate by dephosphorized converter slag and belongs to the field of metallic materials, particularly relates to a process of producing ferric phosphate by multiple steps of extracting iron and phosphorus by reduction reaction, dephosphorizing to produce slag, dissolving phosphorus-rich slag and purifying and finally precipitating, washing and drying. The method includes subjecting dephosphorized converter slag to basicity regulation and carbon-burdened reduction to obtain high-phosphorus molten iron (%P=1-5%), jetting Na2Co3 into the high-phosphorus molten iron to dephosphorize and produce slag to obtain qualified molten iron (%P<0.15%) and phosphorus-rich slag (%P2O5>20%), returning the qualified molten iron to an iron producing process, while dissolving the phosphorus-rich slag to obtain solution containing rich Na<+>, Fe<3+> and PO4<3->, purifying the solution and then regulating the pH value to obtain ferric phosphate, precipitating, washing and drying the ferric phosphate to obtain the ferric phosphate crystal product. The method has the advantages of low energy consumption, high utilization rate of resources, high additional value of products, low production cost, remarkable economic benefit and the like, and solves the problems about utilization of the dephosphorized converter slag and periodic enrichment of phosphorus for iron and steel enterprises.
Description
technical field [0001] The invention belongs to the field of comprehensive recovery and utilization of dephosphorization slag in iron and steel metallurgy, and specifically relates to a method for obtaining qualified molten iron and phosphorus-rich slag to produce ferric phosphate through recycling and processing of dephosphorization slag. technical background [0002] The dual-connection method of the converter has the advantages of less slag, fast pace, and good quality of molten steel. It can adapt to the current situation of higher and higher requirements for steel quality and has broad prospects. However, the recycling of dephosphorization slag has always troubled iron and steel enterprises. Because it contains a large amount of CaO, a large part of the steel slag is returned to sintering as a sintering material, but the long-term return of dephosphorization slag to sintering will make the enrichment of phosphorus more and more difficult. The higher the dephosphorizatio...
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