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Method for assisting semi-steel steelmaking slagging with vanadium mineralization tailings

A technology for steel-making slag-making agent and tailings, which is applied in the field of iron and steel smelting, can solve the problems of non-renewable resources, short duration, pollute the environment, etc., and achieve the effects of reducing production cost, low self-cost, and improving dephosphorization effect.

Inactive Publication Date: 2017-08-04
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the slag of semi-steelmaking mainly depends on the oxidation of iron in the molten metal to form iron oxide in the process of semi-steelmaking to promote the melting of lime and form Ca-Fe slag, which makes it difficult to slag in the blowing process.
In order to solve this problem, it is usually used to add fluoride-containing slag material as a slag-removing agent to assist slag-removal during the blowing process. The amount added is generally 4-6kg / t steel. Adding fluoride-containing slag material can significantly reduce CaO, 2CaO· SiO 2 The melting point and the viscosity of the slag can achieve the effect of rapid slag melting, but there are problems such as short duration and easy return to dryness. Extensive use will increase splashing, aggravate lining erosion and pollute the environment. It is a non-renewable resource.

Method used

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  • Method for assisting semi-steel steelmaking slagging with vanadium mineralization tailings
  • Method for assisting semi-steel steelmaking slagging with vanadium mineralization tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Production of steel type SS400, the amount of semi-steel loaded into the converter is 173 tons, [C] 3.69%, [S] 0.043%, [P] 0.124% in the semi-steel, the temperature is 1372°C, the steel output of this converter is 165 tons, the production Steel grade SS400 blowing end target temperature is 1650℃, [C]0.06-0.10%, [S]≤0.035%, [P]≤0.020%. Lime is added at 25kg / t steel for blowing, dolomite is added at 10kg / t steel, and vanadiumized tailings are added at 4kg / t steel (see Table 1 for chemical composition content). The slag was sampled after 2 minutes of formation and had a basicity of 3.33 and a total iron content of 24.5%. Add lime in two batches at the time of blowing for 6-7 minutes, and the total amount added is 6kg / t steel. In the middle stage of converter blowing (8 minutes of blowing), the sonar slag analyzer shows that the process is dry, and the instantaneous flow rate is 33000m 3 / h down to 22000m 3 / h, add vanadium slag tailings according to 2kg / t of steel for s...

Embodiment 2

[0030] For the production of steel type SPHC, 173 tons of semi-steel are loaded into the converter, [C] 3.59%, [S] 0.033%, [P] 0.136% in the semi-steel, and the temperature is 1364°C. The steel output of this converter is 165 tons. The production The target temperature at the end of steel SPHC blowing is 1660°C, [C] 0.03%, [S] ≤ 0.028%, [P] ≤ 0.015%. Add lime at 30kg / t of steel for blowing, dolomite at 10kg / t of steel, and vanadized tailings at 5kg / t of steel (see Table 1 for chemical composition). The slag was sampled after 2 minutes of formation, with an alkalinity of 3.56 and a total iron content of 26.4%. Add lime in two batches when blowing for 5-7 minutes, and the total amount added is 8kg / t steel. In the middle stage of converter blowing (7 minutes of blowing), the sonar slag analyzer shows that the process is dry, and the instantaneous flow rate is 33000m 3 / h down to 22000m 3 / h, add vanadium slag tailings according to 2kg / t of steel for slag melting. After 38 sec...

Embodiment 3

[0032]Production of steel type C380CL, the amount of semi-steel loaded into the converter is 173 tons, [C] 3.72%, [S] 0.025%, [P] 0.127% in the semi-steel, the temperature is 1364°C, the steel output of the converter this time is 164 tons, the production Steel grade C380CL blowing end target temperature is 1670℃, [C]0.05%, [S]≤0.022%, [P]≤0.010%. Lime is added at 40kg / t steel for blowing, dolomite is added at 10kg / t steel, and vanadiumized tailings are added at 5kg / t steel (see Table 1 for chemical composition content). The slagging time in the early stage of blowing is 226 seconds. The slag was sampled after 2 minutes of formation, the basicity was 4.86, and the total iron content was 26.59%. Add lime in two batches at the time of blowing for 6-7 minutes, and the total amount added is 10kg / t steel. In the middle stage of converter blowing (7 minutes of blowing), the sonar slag analyzer shows that the process is dry, and the instantaneous flow rate is 33000m 3 / h down to 220...

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Abstract

The invention relates to a method for assisting semi-steel steelmaking slagging with vanadium mineralization tailings and is used for solving the problem of difficulty in semi-steel steelmaking slagging. According to the method, silicon-manganese elements are added to the vanadium mineralization tailings, ball pressing treatment is performed, tailing balls with the particle size ranging from 5 mm to 30 mm are screened out and used as a semi-steel steelmaking slagging agent, blowing is performed for 0-3 min, and 2-10 kg of the vanadium mineralization tailing balls are added to a converter for each ton of steel. With the method, the early slag forming time can be shortened, the lime melting speed can be increased, the time is 42 s shorter than that of traditional technologies in average, and the slag dephosphorization effect is improved. Meanwhile, the vanadium mineralization tailings belong to waste and are low in cost, the iron content is high (the content of TFe is larger than or equal to 26%), the metal yield can be increased, the silicon-manganese oxide content is high (the content of SiO2 and MnO is larger than or equal to 25%), the liquidity of the slag can be effectively improved, the metallurgical effect can be improved, and the production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for assisting semi-steel making slag by using vanadiumized tailing slag. Background technique [0002] At present, for enterprises that use vanadium-titanium magnetite as the main raw material to produce steel, the molten iron used for steelmaking contains trace elements such as vanadium and titanium (referred to as vanadium-containing molten iron). Process, that is, molten iron is smelted into semi-steel after vanadium extraction, and then semi-steel is used for steelmaking. During the vanadium extraction process, most of the elements such as Si, Mn and Ti have been oxidized into the vanadium slag. Compared with ordinary molten iron, the content of Si, Mn, Ti and other elements in the semi-steel is very small, which is not conducive to the slagging and transformation of the steelmaking process. The fluidity of the slag. At present, semi-ste...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/064
CPCC21C7/064C21C7/076C21C2007/0093Y02P10/20
Inventor 方鸣王宝华高建国韩宇王世钊谢海洋
Owner HEBEI IRON AND STEEL