Carbon embedding treatment for chronium-containing solid waste

A solid waste and carbon treatment technology, applied in the field of environmental protection, can solve the problems of low utilization rate and extensive utilization of waste refractory materials

Inactive Publication Date: 2009-07-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, the utilization rate of waste refractory materials is not high, and even if they are recycled, their utilization is basically simple and extensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Chromium slag (its main chemical composition is CaO31.51%, MgO20.02%, Al 2 o 3 6.02%, Fe 2 o 3 10.65%, SiO 2 9.05%, 5.72% total chromium, Cr 2 o 3 (Cr 6+ )0.31%, H 2 (016.75%) is crushed to a particle size of ≤3mm, spread in the sagger, the thickness of the laid chromium-containing solid waste is 0.8m, and a layer of charcoal is covered on it, and its weight is 5% of the weight of the chromium slag. Put it on a flatbed car, and the flatbed car is driven into the heating furnace, and kept at 1300°C for 30 minutes under normal pressure. Then take the car out and let it cool down to room temperature. The detection method of ICP radiation spectroscopy shows that Cr in the treated slag 6+ The content is 1.9ppm.

Embodiment 2

[0022] Chromium slag (its main chemical composition is the same as that in Example 1) is pulverized to a particle size≤3mm, spread in a sagger, the thickness of the laid chromium-containing solid waste is 0.5m, and a layer of coke is covered on it, and its weight is chromium 2% of the slag weight, put the sagger on a flatbed car, and the flatbed car is driven into the heating furnace, and kept at 1150 ° C for 60 minutes under normal pressure. Then take the car out and let it cool down to room temperature. The detection method of ICP radiation spectroscopy shows that Cr in the treated slag 6+ The content is 1.7ppm.

Embodiment 3

[0024] Chromium slag (its main chemical composition is the same as that in Example 1) is pulverized to a particle size≤3mm, spread in a sagger, the thickness of the laid chromium-containing solid waste is 0.1m, and a layer of coke is covered on it, and its weight is chromium 8% of the slag weight, the sagger was placed on a flatbed car, and the flatbed car was driven into a heating furnace, and kept at 1050°C for 180min under normal pressure. Then take the car out and let it cool down to room temperature. The detection method of ICP radiation spectroscopy shows that Cr in the treated slag 6+ The content is 1.6ppm.

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Abstract

The carbon embedding treatment process for chromium-containing solid waste includes the following steps: crushing the chromium-containing solid waste to grain size smaller than 3 mm, spreading the waste in sagger in the thickness of 0.1-1 m and covering the waste with charcoal or coke layer in the amount of 0.5-10 wt% of the waste; setting the sagger on bogie, heating at 1000-1350 deg.c and normal pressure in some heating furnace for 30-180 min, and cooling to room temperature outside the heating furnace. The said process can convert six-valent chromium compound completely into trivalent chromium compound to make chromium slag harmless.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to the treatment and utilization of solid waste, in particular to a carbon embedding treatment method for chromium-containing solid waste. Background technique [0002] Metal chromium and chromium salts are important industrial raw materials and play an important role in the construction of the national economy. They are widely used in chemical industry, metallurgy, light industry, electromechanical, textile and pharmaceutical sectors, especially the two major industries of electroplating and tanning. However, the disposal of chromium-containing wastes during its production process limits its production. Chromium-containing solid waste (including used magnesia-chromium refractories) is one of the 47 most dangerous solid wastes recognized internationally, and it can cause continuous pollution to the surrounding ecological environment. The main harmful components in ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00A62D3/00
Inventor 于景坤颜正国
Owner NORTHEASTERN UNIV LIAONING
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