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Cement solidified waste and toxic chromium slag processing method thereof

A cement solidification and chromium slag technology, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of high leaching rate of hexavalent chromium and poor curing effect, so as to reduce leaching toxicity and save use The effect of good quantity and adsorption capacity

Active Publication Date: 2016-02-10
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a solidified cement body and a method for treating toxic chromium slag. The solidified cement body of the present invention can solve the shortcomings of high leaching rate of hexavalent chromium and poor curing effect of ordinary cement solidified body, and utilizes iron and steel to the greatest extent. Industrial solid waste resources, to ensure that Cr in the leachate after final treatment 6+ The concentration is lower than the concentration standard of the national standard GB5085.3 hazardous waste upper limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1 Preparation of cement solidified body, raw material composition: converter slag 27%, desulfurization ash 8%, chrome slag 32%, fly ash 5.5%, cement 4%, anionic emulsified asphalt 4.5%, glass fiber 1%, water 18% . Converter slag and chromium slag are mixed and ground to 100 mesh. The above raw materials are mixed and stirred evenly and then put into a mold to solidify into a mold. After 24 hours, the mold is removed to obtain a modified cement solidified body of 40mm×40mm×20mm.

[0022] 2 Put the demolded cement block in a constant temperature water bath for curing, the temperature is controlled at 20±2°C, and after curing for 28 days, prepare a leaching solution for the determination of Cr in the leaching solution of the modified cement solidification body 6+ concentration. For the curing of cement blocks, refer to GB / T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" 5.2 The curing of specimens. The preparation method of the leach...

Embodiment 2

[0025] 1 Preparation of modified cement solidified body, raw material composition: converter slag 21%, desulfurization ash 10%, chromium slag 28%, fly ash 9%, cement 6%, non-ionic emulsified asphalt 5.5%, sisal fiber 1.5% , water 19%. Converter slag and chrome slag are mixed and ground to 70 mesh. The above raw materials are mixed and stirred evenly and then put into a mold to be solidified to form a mold. After 30 hours, the mold is removed to obtain a modified cement solidified body of 40mm×40mm×20mm.

[0026] 2 Put the demolded cement block in a constant temperature water bath for curing, the temperature is controlled at 20±2°C, and after curing for 28 days, prepare a leaching solution for the determination of Cr in the leaching solution of the modified cement solidification body 6+ concentration. For the curing of cement blocks, refer to GB / T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" 5.2 The curing of specimens. The preparation ...

Embodiment 3

[0029] 1 Preparation of modified cement solidified body, raw material composition: converter slag 13%, desulfurization ash 12%, chromium slag 25%, fly ash 13%, cement 7.5%, non-ionic emulsified asphalt 6.5%, bamboo fiber 2%, Water 21%. Converter slag and chrome slag are mixed and ground to 40 mesh. The above raw materials are mixed and stirred evenly and then put into a mold to be solidified to form a mold. After 36 hours, the mold is removed to obtain a modified cement solidified body of 40mm×40mm×20mm.

[0030] 2 Put the demolded cement block in a constant temperature water bath for curing, the temperature is controlled at 20±2°C, and after curing for 28 days, prepare a leaching solution for the determination of Cr in the leaching solution of the modified cement solidification body 6+ concentration. For the curing of cement blocks, refer to GB / T50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" 5.2 The curing of specimens. The preparation...

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Abstract

The invention relates to a cement solidified waste. The cement solidified waste comprises 13-27% of converter slag, 8-12% of desulphurization ash, 25-32% of chromium slag, 5-15% of fly ash, 4-8% of cement, 4.5-6.5% of emulsified bitumen, 1-2% of fibers, and the balance of water. The converter slag and the chromium slag are mixed and are ground to 40-100 meshes, all raw materials are mixed and stirred until uniformity, the obtained mixture is put in a die, and is solified to form a mold, and the die is removed 24-36h later. The Cr<6+> leaching concentration is greatly reduced, and it is guaranteed that the concentration of Cr<6+> in a leaching concentration is lower than the concentration standard of national standard GB5085.3 danger waste upper limit.

Description

technical field [0001] The invention belongs to the technical field of environmental protection-solid waste treatment, and in particular relates to a cement solidified body and a method for treating toxic chromium slag. Background technique [0002] As one of the most dangerous solid wastes, chromium slag seriously affects the surrounding environment and the health of people, and also seriously restricts the development of the industry. At present, detoxification treatment is mostly used in the treatment of chromium slag, but the serious problem in this kind of method is that even after detoxification treatment, the chromium slag is difficult to reuse. The oxidation of chromium will rise back to hexavalent chromium, especially the existence of CaO and MgO in the chromium slag will become the condition for this rise, so it cannot be completely detoxified. Through the novelty search, some relevant patents were retrieved, such as CN1038771A discloses a comprehensive utilizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/30C04B24/36C04B16/02C04B14/42C04B18/04
CPCY02W30/91
Inventor 陈鹏胡绍伟马光宇王永王飞刘芳杨大正徐伟
Owner ANGANG STEEL CO LTD
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