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Method for strengthening and solidifying chromium in chromium-containing waste

A waste, high temperature curing technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve problems such as land encroachment, vegetation destruction, soil erosion, etc.

Active Publication Date: 2019-03-22
浙江金泰莱环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous accumulation of tailings, it not only encroached on a large amount of land, but also caused vegetation damage and soil erosion, seriously affecting the ecological environment

Method used

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  • Method for strengthening and solidifying chromium in chromium-containing waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, chromium-containing sludge was treated as the treatment object, and the waste was disposed of through dual solidification treatment of mineralization and high-temperature solidification to reduce the leaching toxicity of chromium in the solidified body. Such as figure 1 As shown, the specific method is as follows:

[0034] Dry the chromium-containing sludge, goethite and kaolin tailings to reduce the moisture content of the chromium-containing sludge, goethite and kaolin tailings from 70%, 30% and 35% to below 10% respectively; and adopt The ball mill grinds the dry chromium-containing sludge, goethite and kaolin tailings to -45μm respectively.

[0035] One portion of chromium-containing sludge and goethite are mixed uniformly at a dry basis mass percentage of 50%:50%, and the mixed material is added to a tube furnace for reduction roasting. The reducing gas is carbon monoxide, and the roasting temperature is 700 ° C. The roasting time is for 4 hours....

Embodiment 2

[0043] In this embodiment, chromium slag is used as the treatment object, and waste disposal is carried out through dual curing treatment of mineralization and high temperature curing to reduce the toxicity of chromium leaching in the solidified body. The specific method is as follows:

[0044]Dry the chromium slag, goethite and kaolin tailings to reduce the moisture content of chromium slag, goethite and kaolin tailings from 55%, 30% and 35% to below 10% respectively; Chromium slag, goethite and kaolin tailings are finely ground to -45μm; chromium slag and goethite are mixed uniformly at a dry basis mass percentage of 40%:60%, and the mixture is added to a tube furnace for reduction roasting, reduction The gas is carbon monoxide, the calcination temperature is 750°C, and the calcination time is 4.5 hours. The roasted slag obtained by roasting and kaolin tailings are mixed uniformly at a dry basis mass percentage of 18%:82% to obtain a secondary mixture, and are cured at a hi...

Embodiment 3

[0047] In this embodiment, the chromium salt slag is treated as the treatment object, and waste disposal is carried out through dual curing treatment of mineralization and high temperature curing to reduce the leaching toxicity of chromium in the solidified body. The specific method is as follows:

[0048] Dry chromium salt slag, goethite and kaolin tailings to reduce the moisture content of chromium salt slag, goethite and kaolin tailings from 45%, 30% and 35% to below 10% respectively; Dry chromium salt slag, goethite and kaolin tailings are finely ground to -45μm; chromium salt slag and goethite are mixed uniformly at a dry basis mass percentage of 45%:55%, and the mixture is added to a tube furnace for For reduction roasting, the reducing gas is carbon monoxide, the roasting temperature is 800° C., and the roasting time is 6 hours. The roasted slag obtained by roasting and kaolin tailings are mixed uniformly at a dry basis mass percentage of 22%:78% to obtain a secondary ...

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Abstract

The invention discloses a method for strengthening and solidifying chromium in chromium-containing waste. The method includes the steps that firstly, the chromium-containing waste, goethite and kaolintailings are dried, and the dried chromium-containing waste, the dried goethite and the dried kaolin tailings are subjected to fine grinding; secondly, the fine-particle chromium-containing waste andthe goethite are evenly mixed according to a ratio, a mixed material is roasted under the reducing atmosphere condition, and roasting slag is obtained; thirdly, the roasting slag and the kaolin tailings are evenly mixed according to a ratio, and a secondary mixed material is obtained; and fourthly, the secondary mixed material is subjected to high-temperature curing under the inert atmosphere condition, and a solidified body is obtained after cooling. By means of the method for strengthening and solidifying the chromium in the chromium-containing waste, the chromium component in the chromium-containing waste is reacted with ferric oxide in the goethite through reduction roasting so that a chromite crystal can be formed, and the easily-released chromium component is solidified into a stable chromite crystal structure; and then high-temperature melting with the silicate component in the kaolin tailings is conducted, secondary solidifying / stabilizing is conducted on the chromite crystal,strengthening and solidifying of the chromium are achieved, and the harmful disposing purpose is achieved.

Description

technical field [0001] The invention relates to the field of harmless disposal of heavy metal waste, in particular to a method for strengthening and solidifying chromium in waste containing chromium. Background technique [0002] Chromium-containing waste is a kind of highly toxic and carcinogenic hazardous waste produced in the process of industrial production. The annual production of slag is the largest, and the harm is also the most serious. The annual discharge of chromium slag in my country is about 400,000 tons, and the cumulative stockpiles have exceeded 6 million tons. At present, the large amount of chromium-containing waste generated by enterprises has not been safely disposed of, but has been piled up in the factory area for a long time, causing serious pollution to soil and groundwater. Therefore, how to deal with chromium-containing waste reasonably and effectively has become an issue of great concern to the current environmental protection. [0003] At pres...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B5/00B09B3/40
Inventor 戴云虎王丽佳陆晓金杨煜强龙於洋沈东升戴友鹏
Owner 浙江金泰莱环保科技有限公司
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