Method for converting calcium and/or magnesium in steel or iron slag into carbonate

A carbonate and magnesium element technology, applied in the production of magnesium carbonate, calcium carbonate/strontium/barium, cement, etc., can solve problems such as poor economy and long process flow

Inactive Publication Date: 2012-02-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the steel slag or iron slag is leached by the acidic medium, calcium, magnesium, and iron elements are leached at the same time, so it is necessary to add alkaline substances to adjust the pH value of the leaching so

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The main components of the steel slag selected in this embodiment are: 45% CaO, 10% MgO, 20% SiO 2 , 20% FeO and 5% other impurities, the specific process is as follows:

[0041] 1) The steel slag is mechanically crushed and sieved to a particle size of 50 mesh to obtain steel slag particles;

[0042] 2) Mix 500ml n-octanol organic solvent containing acetic acid concentration of 0.5mol / l and 100ml deionized water to obtain a two-phase mixed solution;

[0043]3) Take 7.5 grams of steel slag particles obtained in step 1), put them into a 1000ml three-hole flask, and add a two-phase mixed solution into the three-hole flask, then put the three-hole flask into a 30°C water bath with mechanical stirring, and start Leaching reaction, the reaction is maintained for 150 minutes, the water bath and stirring are stopped, and the leachate containing residue is obtained. After standing for a period of time, the system rapidly separates. The upper layer is an organic phase, and the...

Embodiment 2

[0049] The main components of the iron slag selected in this embodiment are: 40% CaO, 10% MgO, 40% SiO 2 , 5% FeO and 5% other impurities, the specific process is as follows:

[0050] 1) Iron slag is mechanically crushed and sieved to a particle size of 200 mesh to obtain iron slag particles;

[0051] 2) Mix 150ml of benzene organic solvent containing propionic acid with a concentration of 2mol / l and 300ml of an aqueous solution containing calcium and magnesium ions with a total concentration of 1.8mol / l to obtain a two-phase mixed solution;

[0052] 3) Take 44.5 grams of steel slag particles obtained in step 1), put them into a 1000ml three-hole flask, and add a two-phase mixed solution into the three-hole flask, then put the three-hole flask into a 90°C water bath with mechanical stirring, and start Leaching reaction, the reaction is maintained for 30 minutes, the water bath and stirring are stopped, and the leachate containing the residue is obtained. After standing for a ...

Embodiment 3

[0058] The main components of the steel slag selected in this embodiment are: 45% CaO, 10% MgO, 20% SiO 2 , 20% FeO and 5% other impurities, the specific process is as follows:

[0059] 1) The steel slag is mechanically crushed and sieved to a particle size of 100 mesh to obtain steel slag particles;

[0060] 2) Mix 150ml of toluene organic solvent containing lactic acid concentration of 1.0mol / l and 150ml of aqueous solution containing calcium ion concentration of 0.5mol / l to obtain a two-phase mixed solution;

[0061] 3) Take 40 grams of the steel slag particles obtained in step 1), put them into a 500ml three-hole flask with condensing reflux, and add the two-phase mixed solution into the three-hole flask, then put the three-hole flask into a 100° C. In the water bath, the leaching reaction was started, and the reaction was maintained for 60 minutes. The water bath and stirring were stopped, and the leachate containing residue was obtained. After standing for a period of t...

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PUM

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Abstract

The invention provides a method for converting calcium and/or magnesium elements in steel slag of scruff into carbonate. The method comprises the following steps: a. mixing organic acid with two to four carbon atoms and an organic solvent compatible with the organic acid to obtain an organic phase; b. adding water into the organic phase to obtain a two-phase mixing solution; c. dipping the steel slag or the scruff with the two-phase mixing solution for 30-150 minutes under 30-100 DEG C to obtain a lixivium containing residue; and d. filtering the lixivium, removing the residue, and leading CO2 gas into the lixivium with the residue removed to obtain the carbonate. In the invention, the organic acid with two to four carbon atoms and the organic solvent compatible with the organic acid are mixed to obtain the organic phase, and water is added into the organic phase to form the two-phase mixing solution which selectively lixiviates the calcium and/or magnesium elements in the steel slag or the scruff, therefore, the calcium and/or magnesium elements are completely lixiviated in the lixiviating process.

Description

technical field [0001] The invention relates to a method for converting calcium and / or magnesium elements in steel slag or iron slag into carbonate, and belongs to the technical field of resource utilization of solid waste slag in the metallurgical industry. Background technique [0002] The solid waste produced by the iron and steel metallurgical industry, such as blast furnace slag, steel slag, ferroalloy slag and dust sludge, accounts for 18% of the total solid waste. Slag contains various useful elements such as calcium, magnesium, iron and other valuable elements, and is a reusable secondary resource. Although most of the solid waste generated by the iron and steel metallurgical industry has been utilized, there is a lack of full-volume and high value-added utilization technology. [0003] Blast furnace slag is a waste residue discharged from the blast furnace when smelting pig iron. It is a solid waste formed from gangue in iron ore, ash in fuel and non-volatile comp...

Claims

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Application Information

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IPC IPC(8): C04B5/00C04B7/147C01F11/18C01F5/24
CPCY02P40/10
Inventor 李会泉包炜军张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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