A kind of harmless treatment method of chromium slag

A technology for harmless treatment of chromium slag, which is applied in the field of harmless treatment of chromium slag and resource utilization, high-temperature melting converter steel slag treatment of chromium slag, and can solve the problem of incomplete detoxification, high treatment cost, and difficult wide-ranging harmless treatment technology Problems such as popularization and application, to achieve the effect of low cost of harmless treatment and simplification of the treatment process

Active Publication Date: 2011-12-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] There are many harmless treatment technologies for chromium slag. If the comprehensive utilization of chromium slag is to be realized at the same time, most of the existing technologies have problems of incomplete detoxification, complicated process, small amount of slag eaten, high treatment cost, and processed chromium slag or its products. Disadvantages such as difficulty in reuse make it difficult for existing harmless treatment technologies to be widely applied

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  • A kind of harmless treatment method of chromium slag

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Effect test

Embodiment 1

[0041] like figure 1 As shown, about 25 tons of slag is discharged from the converter at a time in a steel factory. Before tapping the converter, 1.25 tons of chromium slag from a chromium salt factory that has been dried and crushed with a particle size of 10mm is put into the empty slag tank, and the converter is melted during the slag discharge. The steel slag is poured into the slag tank, and the high-temperature molten converter steel slag at 1610°C is mixed with the chromium slag for melting and high-temperature reduction reaction. The molten converter steel slag is subjected to water quenching and granulation treatment; from the time when the molten converter steel slag and chromium slag begin to mix and undergo smelting reduction reaction, to when the converter steel slag fused with chromium slag enters the drum and the slag treatment reaction ends, the total reaction time is 8 minutes.

[0042] The converter steel slag after water quenching and granulation treatment ...

Embodiment 2

[0046] In a steel plant, about 25 tons of slag is discharged from the converter at a time. When the converter is discharged, all the molten steel slag is poured into the slag tank, and 0.25 tons of chromium slag, which has been dried and crushed and has a particle size of about 1mm, is sprayed into the room at about 1540 °C with a spray gun. In the high-temperature molten converter steel slag, the chromium slag and the converter steel slag are mixed for melting and high-temperature reduction reaction. After the chromium slag is sprayed, the slag tank is transported to the slag treatment site, and the molten converter steel slag mixed with the chromium slag is poured into a shallow pan for watering. The quenching and granulation treatment starts from the time when the chromium slag is completely sprayed into the molten steel slag, and the steel slag fused with chromium slag is poured into the shallow pan to start the slag treatment and the smelting reduction reaction ends. The wh...

Embodiment 3

[0051] 15 tons of converter slag is discharged at a time in a steel factory. Before the converter is tapped, 0.5 tons of chromium slag from a chromium salt factory that has been dried and broken with a particle size of 5mm is put into the slag tank. When the converter is slag discharged, the slag is poured into the empty slag tank. Inside, 1560°C high-temperature molten converter steel slag is mixed with chromium slag for melting and high-temperature reduction reaction. The total reaction time is 5 minutes.

[0052] Converter steel slag after water quenching and granulation treatment is leached according to "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007), the total chromium content in the leach solution is 0.079mg / L, and the hexavalent chromium is 0.019mg / L, barium 0.79 mg / L. Others are the same as embodiment 1.

[0053] Composition (%) in chromium slag and converter steel slag in the embodiment 3 of table 4

[0054] El...

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Abstract

The invention provides a harmless and resourceful treatment method for chromium slag. In the method, the chromium slag is made into dry particles with a particle size of 0.5-10mm and mixed with the molten converter steel slag after tapping, and the amount of the chromium slag added is 0.5-5% of the weight of the molten converter steel slag. The chromium slag and the molten converter steel slag After mixing, melt and react for 1-8 minutes. The process of the method of the present invention is simple, the chromium slag is directly processed by melting the converter steel slag without consuming external energy, the processed chromium slag is fused into the converter steel slag, and comprehensively utilized according to the utilization method of the converter steel slag, thereby realizing the safe recycling of the chromium slag use.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for treating chromium slag by using high-temperature molten converter steel slag, thereby realizing harmless and resourceful chromium slag. Background technique [0002] Chromium slag is a waste residue containing hexavalent chromium produced in the process of producing chromium salt with calcium roasting process. As a toxic solid waste, chromium slag not only endangers people's health, but also causes serious pollution to the ecological environment. Chromium slag contains Cr 2 o 3 and toxic Cr 6+ Contains water soluble sodium chromate Na 2 CrO 4 and acid-soluble calcium chromate CaCrO 4 , with Na 2 CrO 4 In addition, it also contains a large amount of oxides of calcium, magnesium, aluminum, and silicon, which have certain utilization value. Therefore, the harmless treatment and resource utilization of chromium slag are effective ways to realize the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/37A62D101/43
Inventor 王如意陈荣欢顾德仁
Owner BAOSHAN IRON & STEEL CO LTD
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