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A recycling method for dephosphorization of converter steel slag modified by biomass ash slag

A technology of biomass ash and converter steel slag, applied in the direction of recycling technology, phosphate fertilizer, application, etc., to achieve the effect of promoting leaching, easy absorption, important economic and environmental benefits

Active Publication Date: 2020-05-05
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems existing in the current steel slag treatment and utilization process, the present invention provides a recycling method for dephosphorization of converter steel slag modified by biomass ash and slag, which promotes 2CaO·SiO 2 -2CaO·K 2 O·P 2 o 5 and 2CaO·SiO 2 -2CaO·P 2 o 5 The formation of solid solution and the increase of its content, the use of citric acid solution to selectively leach phosphorus in modified steel slag, so as to recycle phosphorus resources and recycle dephosphorized steel slag

Method used

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  • A recycling method for dephosphorization of converter steel slag modified by biomass ash slag
  • A recycling method for dephosphorization of converter steel slag modified by biomass ash slag
  • A recycling method for dephosphorization of converter steel slag modified by biomass ash slag

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Embodiment 1

[0042] Select the converter steel slag produced by the converter duplex process of producing automobile plates in a steel factory, and the recycling method of biomass ash slag modification converter steel slag dephosphorization in this embodiment, its flow chart is as follows figure 1 As shown, it specifically includes the following steps:

[0043] (1) Add rice straw ash under 200 mesh sieves to molten steel slag when slag removal, the ash amount is 5mass%;

[0044] (2) insulation reaction at 1723K for 90min;

[0045] (3) Control the cooling rate to be 5K / min, and slowly drop to room temperature;

[0046] (4) The slag sample particle size of the cooled modified steel slag crushed, ground and screened is 75-150 μm, and the chemical composition of the dephosphorized slag is detected by an X-ray fluorescence spectrometer, and the results are shown in Table 2;

[0047] (5) Prepare 400 mL of citric acid solution with a pH value of 5 and add it to the beaker, and control the acid...

Embodiment 2

[0058] Select the converter steel slag produced by the converter duplex process of producing automobile plates in a steel factory, and the recycling method of the biomass ash slag modification converter steel slag dephosphorization of the present embodiment specifically includes the following steps:

[0059] (1) Add the sugarcane ash under the 200 mesh sieve to the molten steel slag when the slag is discharged, and the ash amount is 8mass%;

[0060] (2) insulation reaction at 1823K for 60 minutes;

[0061] (3) Control the cooling rate to be 4K / min, and slowly drop to room temperature;

[0062] (4) The slag sample particle size of the cooled modified steel slag crushed, ground and screened is 45-48 μm, and the chemical composition of the dephosphorized slag is detected by an X-ray fluorescence spectrometer, and the results are shown in Table 3;

[0063] (5) Prepare 400 mL of citric acid solution with a pH value of 6 and add it to the beaker, and control the acidity and alkalin...

Embodiment 3

[0074] Select the converter steel slag produced by the converter double slag process of producing pipeline steel in a steel factory, and the recycling method for dephosphorization of converter steel slag modified by biomass ash and slag in this embodiment includes the following steps:

[0075] (1) Add rice straw and sawdust ash (mass ratio is 1:1) under 200 mesh sieves to the molten steel slag during slag removal, and the ash amount is 8mass%;

[0076] (2) insulation reaction at 1783K for 80min;

[0077] (3) Control the cooling rate to be 3K / min, and slowly drop to room temperature;

[0078] (4) The slag sample particle size of the cooled modified steel slag crushed, ground and screened is 45-48 μm, and the chemical composition of the dephosphorized slag is detected by an X-ray fluorescence spectrometer, and the results are shown in Table 4;

[0079] (5) citric acid solution 400mL that the preparation pH value is 7 joins in the beaker, controls solution acidity and alkalinity...

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Abstract

The invention discloses a circulating utilizing method of using biomass ash and slag to modify converter steelmaking slag to remove phosphorous, and belongs to the technical field of resource reuse inmetallurgy. According to the method, biomass ash and slag is used to modify molten converter steelmaking slag; then modified converter steelmaking slag is finely grinded; finely grinded converter steelmaking slag is added into a critic acid solution; under the stirring of an electric stirrer, phosphorus in converter steelmaking slag is dissolved out, phosphorus containing filtrate and phosphorusfree steel slag are obtained; the phosphorus containing organic acid solution can be used to produce a liquid phosphorus fertilizer; and the phosphorus free steel slag is dried and then applied to metallurgy. The dissolution rate of phosphorus in steel slag can reach 90%; the dissolution rate of iron is lower than 10%, the iron loss is effectively avoided; the critic acid has weak acidity, the equipment requirements of leaching treatment are low, compared with a strong acid treatment, the processing cost is reduced, and environmental pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of metallurgical resource reuse, and relates to a recycling method for removing phosphorus from modified converter steel slag with biomass ash and slag, and more specifically, to a method for recycling phosphorus in modified converter steel slag by using citric acid. Background technique [0002] Steel slag is a solid waste produced in the steelmaking process, and its output is about 10-20% of crude steel output. Due to the phosphorus element and high free calcium oxide in steel slag, its use in steel plants and cement concrete is limited. Effective use of building materials in the field. For example, in 2017, my country's crude steel output was about 800 million tons, and the discharge of steel slag was close to 100 million tons, and its comprehensive utilization rate was only 25-30%. At present, most of the steel slag is discarded or landfilled after iron selection, which not only occupies the abandoned l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06C22B1/11C05G1/00
CPCC05B13/00C05G5/20C21B3/06C22B1/11C05F11/00Y02P10/20Y02W30/50
Inventor 吕宁宁杨金星苏畅杜传明桂德培王海川孔辉
Owner ANHUI UNIVERSITY OF TECHNOLOGY