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Harmless and resourceful treatment method for chromium slag

A treatment method and resource-based technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of unrecyclable detoxification chromium slag, large storage space, occupation, etc. To achieve the effect of increasing resource utilization, improving economic benefits, and reducing toxic effects

Active Publication Date: 2022-04-08
HUBEI ZHENHUA CHEMICAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the described invention has complete detoxification, no chromium return phenomenon, and is easy to realize large-scale production, it also has the problem that the detoxified chromium slag cannot be recycled and occupies a large storage space

Method used

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  • Harmless and resourceful treatment method for chromium slag
  • Harmless and resourceful treatment method for chromium slag
  • Harmless and resourceful treatment method for chromium slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment provides a treatment method for the harmlessness and recycling of chromium slag. The chromium slag used in the treatment method is liquid-phase chromium oxide slag produced by a chromium salt factory. In terms of oxides, iron, nickel, zinc The mass fractions are: 62.09%, 2.46%, and 0.56%, respectively. The treatment method is: the chromium slag is subjected to pretreatment and reduction treatment in sequence to obtain detoxified chromium slag; the pretreatment is specifically: grinding the chromium slag and then passing 60-mesh sieving; the reduction treatment specifically includes: placing the chromium slag in a tube furnace, and feeding H at 900°C 2 Reaction 6h.

Embodiment 2

[0056] This embodiment provides a harmless and resourceful treatment method for chromium slag. The chromium slag used in the treatment method is calcium-free roasted chromium slag produced by a chromium salt factory. In terms of oxides, iron, nickel, zinc The mass fractions are respectively: 45.09%, 1.35%, 0.37%. The processing method is the same as in Example 1, so it will not be repeated here.

Embodiment 3

[0058] This embodiment provides a treatment method for the harmlessness and recycling of chromium slag. The chromium slag used in the treatment method is the same as that in Example 1. The treatment method includes the following steps:

[0059] (1) The chromium slag is subjected to pretreatment and reduction treatment successively to obtain detoxified chromium slag; the pretreatment is specifically: the chromium slag is ground and sieved through 60 meshes; the reduction treatment is specifically: the chromium slag is placed in the tube In the type furnace, H was introduced at 900°C 2 Reaction 6h;

[0060] (2) The detoxified chromium slag obtained in step (1) is pickled for 1 hour by using a hydrochloric acid solution with a concentration of 5 wt%, and then suction-filtered to obtain the acid-washed and detoxified chromium slag.

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Abstract

The invention provides a chromium slag harmless and recycling treatment method which comprises the following steps: (1) sequentially carrying out pretreatment and reduction treatment on chromium slag to obtain detoxified chromium slag; (2) the detoxified chromium slag obtained in the step (1) is subjected to acid pickling treatment, and acid-pickled detoxified chromium slag is obtained; (3) vulcanizing the acid-washed detoxified chromium slag obtained in the step (2) to obtain vulcanized detoxified chromium slag; and (4) using the detoxified chromium slag obtained in the step (1), or the acid-washing detoxified chromium slag obtained in the step (2), or the vulcanized detoxified chromium slag obtained in the step (3) for repairing hexavalent chromium polluted water or soil. According to the treatment method provided by the invention, the chromium slag is detoxified, meanwhile, the obtained chromium slag is subjected to resource utilization, waste is turned into wealth, the effect of treating pollution with waste is achieved, meanwhile, the operation process is simplified, the treatment cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and relates to a harmless treatment method for chromium slag, in particular to a harmless and resourceful treatment method for chromium slag. Background technique [0002] As an important basic raw material in metallurgy, medicine, leather, pigments, electroplating and other industries, chromium salts are widely used in various sectors of the national economy, and they are a type of inorganic chemical raw materials that our country focuses on. Due to the long-term lack of advanced chromium salt production technology, domestic chromium salt factories will produce a large amount of harmful chromium slag during the production process, causing serious environmental pollution problems. The hexavalent chromium contained in chromium slag is listed as one of the eight most harmful chemical substances to the human body because of its carcinogenicity, and chromium slag is also included in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/37C02F1/62C09K17/02C02F101/22A62D101/24
CPCY02P10/20
Inventor 张红玲段静商琴王源陈明轩周鹏侯礼强高增礼石义赟何谦马丹裴丽丽万振飞徐红彬
Owner HUBEI ZHENHUA CHEMICAL CO LTD