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Innocent treatment of cyanide and fluoride in solid waste residues and recycling process thereof

A technology of harmless treatment and solid waste, which is applied in the direction of protective devices against harmful chemicals, etc., can solve problems such as farmland occupation and hidden dangers of the ecological environment, and achieve the effect of saving land use, simple equipment, and eliminating sources and hidden dangers

Active Publication Date: 2009-06-03
浙江钰滔环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this calculation, the accumulation of overhaul slag in one year is 360,000 tons, which will lead to the occupation of a large amount of farmland and cause serious hidden dangers to the local ecological environment.

Method used

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  • Innocent treatment of cyanide and fluoride in solid waste residues and recycling process thereof
  • Innocent treatment of cyanide and fluoride in solid waste residues and recycling process thereof
  • Innocent treatment of cyanide and fluoride in solid waste residues and recycling process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put the overhaul slag and 15% by weight bleaching powder (25-32%) into the ball mill, add 100% water, ball mill to make pulp, control the ball mill time according to the loading, and add acid to the slurry after the test meets the standard. and discharge. Solid-liquid separation is sufficient.

Embodiment 2

[0038] Put overhaul slag and 5-10% bleaching powder (25-32%) and 100% water, ball mill for 1 hour, then add 50% calcium chloride hexahydrate by weight of overhaul slag, (or a mixture of hydrochloric acid and calcium carbonate) Ball milling until the pH value of the slurry is neutral, and the detection meets the discharge standard.

Embodiment 3

[0040] Ball mill the overhaul slag and 5-10% bleaching powder (25-32%) and 100% water for 1 hour, then add 50% magnesium chloride hexahydrate in the weight ratio of the overhaul slag, and ball mill until the pH value of the slurry is neutral. ,Discharge.

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Abstract

The invention relates to innocent treatment of cyanide and fluoride in solid waste residues and a recycling process thereof. The method of innocent treatment and recycling of cyanide and fluoride contained in electrolysis bath overhaul residues or solid at a normal temperature is characterized in that a water ball mill with a weight ratio of 1:1 is added into and mixed with the electrolysis bath overhaul residues containing cyanide and fluoride, calcium or magnesium or sodium compound that can produce hypochlorous acid by being dissolved in water, and water-soluble calcium or magnesium or aluminum salt to prepare pulp, thereby enabling cyanide to be dissolved and reduced in the liquid phase of ball mill pulping; meanwhile, calcium ions, magnesium ions and aluminum ions released by water-soluble calcium or magnesium or aluminum salt and fluoride ions in the liquid phase form water-insoluble calcium fluoride, magnesium fluoride and aluminum fluoride which are harmless sediments; and neutral water is separated from slurry by the solid-liquid separation, so that the purpose of decontamination and no discharging can be achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a harmless treatment and recovery process of cyanide and fluoride in electrolytic cell overhaul slag or solid waste slag. Background technique [0002] At present, the electrolytic cell of the aluminum factory is the main equipment for the production of electrolytic aluminum. Due to the service life of the electrolytic cell, it needs to be repaired and replaced regularly. The main components of the overhaul slag replaced are some refractory materials, impermeable fillers and carbon materials , due to the need to add electrolytes (fluoride, mainly aluminum fluoride, sodium fluoride, cryolite about 26-32KG / T AL) in the production process, and a lot of fluoride and cyanide (graphite electrode) are immersed in the overhaul slag during high-temperature production leaching), (the concentration of fluoride in the slag leachate is greater than 50mg / liter, and some cyan...

Claims

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Application Information

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IPC IPC(8): A62D3/38A62D3/33A62D101/49A62D101/45
Inventor 吴正建
Owner 浙江钰滔环保科技有限公司
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