Novel chromium slag innocent treatment method

A technology of harmless treatment and chromium slag, which is applied in the field of harmless treatment of new chromium slag, can solve the problems of high treatment cost and large investment, and achieve the effect of harmless disposal

Inactive Publication Date: 2010-12-08
刘阳生 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The investment of this method is large, and the processing cost is relatively high

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the chromium slag, quartz sand and alkaline agent soda ash are uniformly mixed according to the weight ratio of 25-45:35-75:5-22 to obtain a mixture 1, and the mixture 1 is added to the glass electric melting furnace 2, and the temperature is 1350-1500 It is fully melted at ℃, and the liquid level of glass in the electric melting furnace is stable after 8 to 10 hours. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0028] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

Embodiment 2

[0030] Such as figure 1 As shown, the chromium slag, quartz sand and lime are uniformly mixed according to the weight ratio of 25:60:15 to obtain the mixture 1, which is added to the glass electric melting furnace 2 and fully melted at 1350°C. After 10 hours, the molten glass in the electric melting furnace The surface is stable. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0031] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

Embodiment 3

[0033] Such as figure 1 As shown, the chromium slag, quartz sand and alkaline agent soda ash are evenly mixed according to the weight ratio of 45:45:10 to obtain a mixture 1, which is added to the glass electric melting furnace 2 and fully melted at 1500 ° C. After 8 hours, the electric melting furnace The inner glass liquid level is stable. A small amount of dust-laden flue gas 3 is produced during the melting process, which is dedusted by the bag filter 4, and the purified flue gas is discharged into the atmosphere through the induced draft fan 5 and the chimney 6.

[0034] The mixture 1 is added to the electric glass melting furnace 2 to form a high-temperature glass liquid 7, which is discharged into the water quenching system 8 from the middle of the electric glass melting furnace 2, and the glass slag 9 is obtained after quenching with cold water.

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Abstract

The invention discloses a novel chromium slag innocent treatment method. In the method, quartz sand and an alkaline medicament are taken as melting agents, and chromium slag, the quartz sand and the alkaline medicament are uniformly mixed in a weight ratio of 25-45:35-75:5-22; the mixture is added into an electric glass melting furnace and is fully melted at a high temperature of between 1,350 and 1,500 DEG C to form molten glass; and the molten glass is subjected to water quenching by cold water, and cooled at room temperature to form glass slag. Through high-temperature electric melting treatment, hexavalent chromium in the chromium slag is reduced into trivalent chromium and is cured and stabilized after entering glass lattices, and the chromium slag is converted into glass state inert waste, and the leaching concentration of heavy metals is far lower than a standard limit value in Identification Standard for Hazardous Wastes-Identification for Extraction Procedure Toxicity (GB5085.3-2007) of the nation.

Description

technical field [0001] The invention relates to a novel harmless treatment method for chromium slag. Background technique [0002] Since chromium salts are widely used in various fields of the national economy, and most of them are essential consumable chemical raw materials, the healthy development of chromium salts is inseparable from the development of various related industries. [0003] In recent years, the annual growth rate of China's chromium salt consumption is above 10%, which is higher than the growth rate of the national economy in the same period. [0004] China's chromium salt production generally adopts relatively backward calcium roasting technology. For every 1 ton of chromium salt product produced, 2.5 to 3 tons of chromium slag will be produced. Chromium slag is toxic and hazardous waste because it contains 1-2% calcium chromate with carcinogenic properties and 0.5-1% water-soluble highly toxic hexavalent chromium. [0005] The current main methods for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/04
Inventor 袁利民刘阳生
Owner 刘阳生
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