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A treatment method for carbonation and desulfurization of steelmaking refining slag

A treatment method and carbonation technology, applied in the direction of process efficiency improvement, recycling technology, etc., can solve the problems of low reactivity of calcium silicate, impact on slag utilization, high treatment cost, etc., to improve carbonation efficiency and reaction degree , the effect of increasing the reaction area

Active Publication Date: 2021-06-15
HUNAN CITY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Difficulty in solving the above technical problems: The existing direct carbonation of refining slag has been technically difficult to overcome the formation of calcium carbonate or hydrated calcium aluminum carbonate film on the surface of refining slag to prevent the continuous reaction and the low reactivity of calcium silicate. If the technology to solve this problem is too complicated, the cost of slag treatment will be too high, and the utilization of slag will be directly affected. Therefore, a simple and easy-to-achieve method for improving the carbonation and desulfurization efficiency of refining slag is needed
[0007] The significance of solving the above technical problems: obtaining a refining slag desulfurization method with simple process and high desulfurization efficiency is beneficial to the comprehensive utilization of refining slag and avoids environmental problems caused by direct dumping of refining slag, which is of great significance to the sustainable development of iron and steel enterprises

Method used

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  • A treatment method for carbonation and desulfurization of steelmaking refining slag
  • A treatment method for carbonation and desulfurization of steelmaking refining slag
  • A treatment method for carbonation and desulfurization of steelmaking refining slag

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Effect test

Embodiment 1

[0037] A sample of refining slag was obtained from a steel plant, and its chemical composition is shown in Table 1. Grind the slag finely, pass through a 200 mesh sieve, fully mix the finely ground slag with water at a solid-liquid ratio of 1:10, react at 80°C for 15 minutes, add a small amount of water to keep the solid-liquid ratio at 1:10, While stirring, CO 2 , CO 2 The flow rate is 0.5L / (min·g slag), the reaction temperature is 40°C, and the reaction pressure is normal pressure. After 20 minutes of reaction, the ventilation is stopped, the suspension is filtered, and the filter residue is fully washed with water and dried. Compared with the S content of 0.98% in the original slag, the S content reduction rate is 67.3%.

[0038] figure 2 Shown are the XRD patterns of the original slag and the direct carbonation slag of the original slag, image 3 Shown are the XRD patterns of hydrothermally pretreated slag and carbonated 5 and 20 min of pretreated slag. Depend on f...

Embodiment 2

[0043] A sample of refining slag was obtained from a steel plant, and its chemical composition is shown in Table 2. Grind the slag finely and pass it through a 200-mesh sieve. Fully mix the finely ground slag with water at a solid-liquid ratio of 1:15. Use an ultrasonic pulverizer to ultrasonically treat it for 10 minutes at a working frequency of 18kHZ. Supplement water to maintain the solid-liquid ratio. At 1:15, while stirring, blow CO 2 , CO 2 The flow rate is 0.8L / (min·g slag), the reaction temperature is 30°C, and the reaction pressure is normal pressure. After 20 minutes of reaction, the ventilation is stopped, the suspension is filtered, the filter residue is fully washed with water and dried, and the concentration of the residue after desulfurization reaction is determined. The S content of the slag is 0.44%, compared with the S content of 2.16% in the original slag, the S content reduction rate is 79.6%.

[0044] Figure 7 Shown are the XRD patterns of ultrasonic ...

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Abstract

The invention belongs to the technical field of smelting slag treatment and disposal, and discloses a treatment method for carbonation and desulfurization of steelmaking refining slag. The invention accelerates hydration before refining slag carbonation through hydrothermal pretreatment or ultrasonic pretreatment, so that alumina Calcium becomes flaky calcium aluminate hydrate, increasing the calcium aluminate and CO 2 The reaction area avoids the formation of calcium carbonate or hydrated calcium aluminocarbonate film, which improves the reaction rate. In addition, the activity of calcium silicate is stimulated by ultrasonic treatment, and the interaction between calcium silicate and CO is improved. 2 reaction speed. The invention uses hydrothermal pretreatment for carbonation, and the desulfurization efficiency is increased by more than 20% compared with direct carbonation without pretreatment, and the desulfurization efficiency is increased by more than 30% with ultrasonic pretreatment than direct carbonation without pretreatment. The invention can significantly improve the efficiency of the carbonation desulfurization reaction, speed up the reaction speed, and has a relatively simple process, which can be directly carried out at normal temperature and pressure.

Description

technical field [0001] The invention belongs to the technical field of smelting slag treatment and disposal, and in particular relates to a treatment method for carbonation and desulfurization of steelmaking refining slag. Background technique [0002] At present, the closest existing technology: refining slag is a kind of waste slag produced in the molten steel refining process, and its main chemical components are CaO, MgO, Al 2 o 3 and SiO 2 etc. According to different slag systems, Al in refining slag 2 o 3 and SiO 2 Contents will vary. The main utilization ways of refining slag include recycling to refining process or as raw material for building materials. However, due to the high content of S in refining slag, its utilization in these fields is limited, and it has to be dumped or mixed with converter slag for sale. Al 2 o 3 Not being used effectively. Therefore, in order to obtain high-value utilization of refining slag, it is necessary to remove the sulfur i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/06
CPCC21B3/06Y02W30/50Y02P10/20
Inventor 黄毅
Owner HUNAN CITY UNIV
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