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A Harmless Treatment Process for Waste Hazardous Chemicals Containing Arsenic

A technology of harmless treatment and chemicals, applied in the direction of solid waste removal, etc., can solve problems such as potential safety hazards, lack of harmless disposal technology for hazardous chemicals containing arsenic, and the lack of disposal qualifications and actual disposal capacity destruction units, etc. , to achieve the effect of strong practicability, avoiding unpredictable safety risks, and eliminating hidden dangers of social safety

Active Publication Date: 2014-10-08
浙江归零环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with developed countries, my country lacks the technology that can truly realize the harmless disposal of waste hazardous chemicals containing arsenic. So far, there has not been a destruction unit with corresponding disposal qualification and actual disposal capacity in China.
In most areas, arsenic-containing highly toxic drugs have been stored for many years and have not been safely destroyed, so there is a great potential safety hazard

Method used

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  • A Harmless Treatment Process for Waste Hazardous Chemicals Containing Arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 pilot test process:

[0028] (1) Processing object

[0029] Suzhou Shangmei International Cosmetics Co., Ltd. contains arsenic poisonous drugs: 300g sodium arsenate, 493g diarsenic trioxide, 250g sodium arsenite, and the total arsenic in the leachate of the original mixture is higher than 50000mg / L.

[0030] (2) Treatment process

[0031] Process flow diagram as figure 1 Shown:

[0032] In a mobile reactor, add the above-mentioned arsenic-containing highly toxic mixture into water, add ferrous sulfate to form a solution, make the molar ratio of Fe and As in the solution greater than or equal to 2.5:1, and then use nitric acid to adjust the pH value of the solution to less than 2, then add hydrogen peroxide (the mass percent concentration of hydrogen peroxide is 20% to 30%) for oxidation reaction; wherein the H2O2 in the hydrogen peroxide is controlled 2 o 2 The molar ratio of arsenic to arsenic in waste containing arsenic is 3:1. After the reaction is...

Embodiment 2

[0038] Embodiment 2 engineering application:

[0039] (1) Processing object

[0040] Wujiang Lvyi Solid Waste Recycling and Disposal Co., Ltd. contains 15 tons of dangerous chemicals containing arsenic, with an arsenic content (average) of 37.18%, and leached arsenic of 29702mg / L.

[0041] (2) Process parameters of each processing unit

[0042] Reaction pool: The reaction pool is a PP structure with a size of Φ3.0m×2.2m and an effective volume of 14m 3, equipped with a stirring device with a power of 7.5kW, an exhaust system on the top (the power of the induced draft fan is 5.5kW), and a set of plate and frame filter press (80m 2 ).

[0043] Curing machine: twin-shaft forced mixer, productivity 25m 3 / h.

[0044] Process flow diagram as figure 1 Shown:

[0045] Put 200kg of the above-mentioned arsenic-containing dangerous chemicals into the reaction tank, add ferrous chloride aqueous solution, make the molar ratio of Fe and As in the solution be 2.5:1, then adjust the p...

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Abstract

The invention provides a harmless treatment process of a arsenious waste chemical, comprising the following steps of: (1) mixing an arsenious waste with water, adding ferric salt or ferrous salt, then regulating the pH value of a solution to be less than 2 through use of nitric acid, and then adding hydrogen peroxide to completely convert organic arsenic and tervalent As which are contained in a reaction system into AsO4<2-> and completely convert Fe<2+> into Fe3+ at the same time; (2) regulating the pH value of the solution obtained from the step (1) to 9-10 through use of calcium hydroxide to form an arsenic-ferric complex precipitation; and (3) adding cement to the arsenic-ferric complex precipitation and waste liquor which are generated in the step (2) for solidification treatment so as to obtain a cement solidified body. According to the harmless treatment process provided by the invention, a chemical treatment technology and a cement solidification technology are organically combined into a whole; and the leaching toxicity concentration of arsenic contained in the obtained cement solidified body is less than 5 mg / L and reaches the national standard related to harmlessness.

Description

technical field [0001] The invention belongs to the technical field of waste treatment technology, and in particular relates to a harmless treatment technology for waste hazardous chemicals containing arsenic. Background technique [0002] Cement solidification technology is an important means to deal with heavy metal waste and other non-metal hazardous waste. Hazardous wastes are immobilized in an inert, impermeable matrix by solidification. After solidification, toxic and harmful pollutants can be transformed into substances with relatively stable physical and chemical characteristics with low solubility, low migration and low toxicity. [0003] The mechanism of solidification technology to stabilize waste components is the combined action of the chemical bonding force between waste and coagulant, the physical inclusion of coagulant on waste, and the adsorption of hydration products of coagulant to waste, so that waste can be transformed into immobile solid or compact soli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 孙斌陈燕
Owner 浙江归零环保科技有限公司
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