Method for modifying high-temperature steel slag by using compound materials of tailings

A technology of tailings and steel slag, which is applied in the field of high-temperature steel slag modification and high-temperature furnace slag modification, can solve the problems of poor grindability and high energy consumption of grinding, meet environmental protection requirements, low input cost, improve grindability and The effect of gelling activity

Active Publication Date: 2012-07-25
迁安金隅首钢环保科技有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, adopt bulk and cheap mining tailings, and use waste heat to modify steel slag, realize secondary phase reaction at high temperature, control the mineral phase composition in steel slag, and promote the separation of slag and iron , to solve the disadvantages of poor grindability and high grinding energy consumption of steel slag and post-selection slag, and facilitate the crushing and recycling of steel slag and the low-consumption application development of post-selection waste slag

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  • Method for modifying high-temperature steel slag by using compound materials of tailings

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Effect test

Embodiment 1

[0031] 1. The compound materials of high-alumina silicate tailings, high-calcium silicate tailings and calcareous carbonate tailings are selected as steel slag upgrading materials, among which bauxite tailings, gold mine tailings and The limestone tailings were mixed according to the parts by weight of 20, 80 and 5 respectively, and the main components of the mining tailings used are shown in Table 2.

[0032] 2. The particle size of the tailing compound material used as a high-temperature steel slag reforming material is less than 3 mm, and it is pelletized into an agglomerated mass, specifically an ellipsoid with a major axis of 5 mm and a minor axis of 3 cm.

[0033]3. The above-mentioned steel slag reforming material is mixed with the high-temperature steel slag discharged from the Shougang steelmaking plant and the high-temperature reforming material in a ratio of 70:30 by mass. The method of adding is: put the tailings compound material with a mass percentage of 60% in t...

Embodiment 2

[0037] 1. The compound materials of high-alumina silicate tailings, high-calcium silicate tailings and calcareous carbonate tailings are selected as steel slag upgrading materials, among which coal gangue, gold mine tailings and limestone gravel are respectively used Mixing according to the parts by weight of 30, 60 and 12 respectively, the main components of the used mining tailings are shown in Table 2.

[0038] 2. The particle size of the tailing compound material used as a high-temperature steel slag reforming material is less than 3 mm, and it is pelletized into an agglomerated mass, specifically an ellipsoid with a major axis of 5 mm and a minor axis of 3 cm.

[0039] 3. The above-mentioned steel slag reforming material is mixed with the high-temperature steel slag discharged from the Shougang steelmaking plant and the high-temperature reforming material at a ratio of 80:20 by mass. The way of adding is: put the 50% mass percentage of tailings compound in the slag tank o...

Embodiment 3

[0043] 1. The composite material of high-alumina silicate tailings, high-calcium silicate tailings and calcareous carbonate tailings is selected as steel slag upgrading material, among which coal gangue, iron tailings and limestone tailings are respectively used according to The parts by weight are respectively 24, 70 and 10 for mixing, and the main components of the used mining tailings are shown in Table 2.

[0044] 2. The particle size of the tailings composite material used as a high-temperature steel slag reforming material is less than 3 mm, and a spherical agglomeration block with a diameter of 4.5 cm is prepared by pelletizing.

[0045] 3. Mix the above-mentioned steel slag reforming material with the high-temperature steel slag discharged from the converter of Masteel and the high-temperature reforming material in a ratio of 75:25 by mass. The way of adding is: put the tailings compound material with a mass percentage of 40% in the slag tank or slag pan in advance, af...

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Abstract

The invention relates to method for modifying steel slag, in particular to a method for modifying high-temperature steel slag discharged in the final steelmaking stage by using a large amount of mining tailings with low cost, comprising the following steps: mixing 15-30 parts by weight of high alumina silicate tailings, 60-80 parts by weight of high calcium silicate tailings and 5-15 parts by weight of calcium carbonate tailings to obtain compound materials of the tailings; granulating to prepare agglomerated blocks of 3-5cm; adding the compound materials of the tailings into steel slag pot or disc by batches according to the proportion of (70-80%):(20-30%) of the discharged steel slag and the compound materials of the tailings; carrying out steel slag splashing for furnace maintenance, wherein the left steel slag is not poured into the steel slag pot or disc for modifying the steel slag; preserving the temperature of the steel slag at 1,200-1,400 DEG C for 30-60min; quenching by using water, applying heat or covering by heat when the temperature is below 1,200-1,400 DEG C; breaking; and carrying out magnetic separation. Due to the adoption of the method, the separation effect of the steel slag can be improved significantly, the grindability of the separated steel slag can be improved, the total recovery rate of the scrap steel can be up to 95-100%, the components of the separated steel slag are controllable and have high activity, and the separated steel slag contain less than 1.5% by weight of the free calcium oxide, has the grinding work index of 14-17kw.h/t and can replace the portland cement clinker.

Description

technical field [0001] The invention relates to a method for upgrading high-temperature slag, in particular to a method for upgrading high-temperature steel slag discharged in the final stage of steelmaking by using bulk and cheap mining tailings, so as to facilitate the crushing and recycling of steel slag and the low-energy consumption of waste slag after selection The development belongs to the technical field of comprehensive utilization of industrial waste. Background technique [0002] With the rapid development of urbanization and industrialization in my country, the annual steel output has exceeded 500 million tons. Steel slag is a by-product of the steelmaking process. The average production of 1 ton of steel will generate about 0.15 to 0.2 tons of steel slag. Based on this calculation, my country’s crude steel output reached 630 million tons in 2010, and the discharge of steel slag was nearly 100 million tons, of which more than 70% were It is converter steel slag....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCC21B3/06C21B3/08C21B2400/02C21B2400/024C21B2400/08Y02P10/20Y02P10/25
Inventor 连芳张作顺郝洪顺徐利华高小武付福旗
Owner 迁安金隅首钢环保科技有限公司
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