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A method for comprehensively treating waste iron oxide desulfurizer and chromium slag

An iron oxide desulfurizer and comprehensive treatment technology, applied in the field of waste treatment, to achieve the effects of high conversion rate, simple process, huge social and economic benefits

Inactive Publication Date: 2015-08-19
李平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention effectively solves the problem of harmless treatment of the existing waste iron oxide desulfurizer and chromium slag, and at the same time does not need to use other additives, effectively reduces the treatment cost, has simple process, convenient operation, and has the characteristics of energy saving, economy and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 2000kg of chromium slag, which contains 16.2kg of sodium chromate and 8.5kg of calcium oxide. After crushing the chromium slag, set aside.

[0028] Get 1000kg of waste iron oxide desulfurizer after washing with water, after measuring: wherein contain 92.5kg ferrous sulfate, 8kg ferrous sulfide. And under the condition of keeping the aqueous solution on the surface of the waste iron oxide desulfurizer, the waste iron oxide desulfurizer is pulverized and set aside.

[0029] The waste iron oxide desulfurizer is added into the closed reactor, and then the chromium slag is added into the closed reactor, so that the waste iron oxide desulfurizer and the chromium slag are reacted in the closed reactor at normal temperature and pressure. In this reaction, the FeS in the spent iron oxide desulfurizer reacts to finally generate CaSO 4 ; Ferrous sulfate in waste iron oxide desulfurizer and Na in chromium slag 2 CrO 4 reaction to produce Cr(OH) 3 , so as to achieve the pu...

Embodiment 2

[0033] Take 2000kg of chromium slag, which contains 8.1kg of sodium chromate, 7.8kg of calcium chromate and 9.5kg of calcium oxide. After crushing the chromium slag, set aside.

[0034] Get 1000kg of waste iron oxide desulfurizer after washing with water, after determination: wherein contain 100.5kg ferrous sulfate, 8.5kg ferrous sulfide. And under the condition of keeping the aqueous solution on the surface of the waste iron oxide desulfurizer, the waste iron oxide desulfurizer is pulverized and set aside.

[0035] The waste iron oxide desulfurizer is added into the closed reactor, and then the chromium slag is added into the closed reactor, so that the waste iron oxide desulfurizer and the chromium slag are reacted in the closed reactor at normal temperature and pressure. In this reaction, the FeS in the spent iron oxide desulfurizer reacts to finally generate CaSO 4 ; Ferrous sulfate in waste iron oxide desulfurizer and Na in chromium slag 2 CrO 4 and CaCrO 4 reaction ...

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Abstract

The invention discloses a method for comprehensively treating waste iron oxide desulfurizer and chromium slag so as to solve the problems that the conventional waste iron oxide desulfurizer contains FeS, the treating process is complex, the safety is low, the investment is high, the running expense is high and certain defects are existent in the conventional chromium salt detoxifying method. The method comprises two steps of pre-treating and mixing for reaction. According to the method, the two wastes are skillfully treated by each other and interact with each other to achieve the purpose of treating wastes with wastes; harmless treatment on the waste iron oxide desulfurizer and the chromium slag is effectively achieved while no other additive is used, so that the treatment cost is effectively reduced; the method is simple in process and convenient to operate, and has the characteristics of energy conservation, economy and environmental protection; the method is of important significance for solving the problem of the treatment of the waste iron oxide desulfurizer and the chromium slag, and especially can be used for effectively treating the chromium slag to effectively reduce harm of the chromium slag to the environment.

Description

technical field [0001] The invention relates to the field of waste treatment, in particular to a method for comprehensively treating waste iron oxide desulfurizers and chromium slag. Background technique [0002] In the desulfurization tower of the natural gas processing station, after the used iron oxide desulfurizer fails, it needs to be replaced with a new iron oxide desulfurizer, thus, a large amount of waste iron oxide desulfurizer will be produced. Waste iron oxide desulfurizer is a kind of sulfur containing elemental sulfur, inorganic sulfur (such as FeS, FeSO 4 , Fe 2 S 3 etc.), organic sulfur, etc., the FeS contained in it is the main hazard. FeS is low toxic and irritating. Ingestion can cause gastrointestinal irritation symptoms. Long-term inhalation of the dust may cause pneumoconiosis. At the same time, the ignition point of FeS is only 40°C, which is a highly flammable sulfide. When it is in a solution state, it is difficult to show its spontaneous combusti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 李平
Owner 李平
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