Process for detoxicating chrome slag using sulfur fine sand

A technology of sulfur concentrate sand and chromium slag, which is applied to chemical instruments and methods, chromium compounds, solid waste removal, etc., can solve problems such as hexavalent chromium pollution, poor reduction conditions, and inability to completely restore hexavalent chromium, and achieve No secondary pollution effect

A technology of sulfur concentrate sand and chromium slag, which is applied to chemical instruments and methods, chromium compounds, solid waste removal, etc., can solve problems such as hexavalent chromium pollution, poor reduction conditions, and inability to completely restore hexavalent chromium, and achieve No secondary pollution effect

CN1792480AActive Publication Date: 2006-06-28SICHUAN YINHE CHEM
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] a. Add 30kg of chromium slag to the rotary kiln for roasting, and spray 70kg of sulfur fine sand with a fineness of 5mm. The temperature of the fluidized fluidized furnace is controlled at 700-800°C. Roast until the reaction is complete.

[0014] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

Embodiment 2

[0016] a. Add 40kg of chromium slag to the rotary kiln for roasting, and spray 60kg of sulfur fine sand with a fineness of 5mm. The temperature of the fluidized fluidized furnace is controlled at 700-800°C. Roast until the reaction is complete.

[0017] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

Embodiment 3

[0019] a. Add 60kg of chromium slag to the rotary kiln for roasting, and spray 40kg of sulfur fine sand with a fineness of 5mm. The temperature of the fluidized fluidized furnace is controlled at 700-800°C. Roast until the reaction is complete.

[0020] b. Test results of chromium slag after detoxification: There is no hexavalent chromium in the detoxified chromium slag, and the total chromium content in the tail gas is zero.

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Abstract

A process for detoxicating Cr slag by sulfogen sand includes such steps as mixing Cr slag with sulfogen sand in rotary kiln, calcining at 500-1000 deg.C for generating SO2, using SO2 to reduce Cr slag for removing water-soluble Cr and acid-soluble Cr, using the residual dreg to produce cement, and using the tail gas to prepare sulfuric acid.

Description

technical field [0001] The invention relates to a method for detoxifying chromium slag by using sulfur fine sand, in particular to a method for spraying flowing fine sand into a rotary kiln for roasting chromium slag to detoxify water-soluble hexavalent and water-insoluble calcium chromate in chromium slag. Background technique [0002] In today’s chromium salt production, most calcareous fillers are used for roasting, such as dolomite, limestone, chromite, soda ash and some chromium slag mixed powder. This process produces a large amount of chromium slag. 2 to 2.5 tons. Since chromium slag contains hexavalent chromium, up to 2 to 3% (calculated as chromium trioxide), and chromium slag contains water-insoluble calcium chromate, which is a carcinogen, so a large amount of chromium slag is discarded or utilized, such as If the toxins (water-soluble hexavalent chromium and water-insoluble calcium chromate) are not removed, it will cause great threat and damage to human beings ...

Claims

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Application Information

Patent Timeline
28 Jun 2006
Publication
CN1792480A
IPC
B09B3/00; C01G37/00
Inventors
李先荣; 张国庆