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A process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue

A stabilization treatment, multi-valence technology, applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of arsenic secondary pollution and thermal pollution that are difficult to control, high operating costs and energy consumption, landfill and storage burdens, etc. , to achieve the effect of low cost, reduced dissolution rate and small capacity increase ratio

Active Publication Date: 2019-04-09
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Objectively speaking, the method of direct high-temperature calcination has high operating cost and energy consumption, reaching hundreds of yuan per cubic meter, and the volatilization of arsenic in the high-temperature process of calcination makes it difficult to control the secondary pollution and thermal pollution of arsenic; although the method of cement solidification As a relatively mature method, it is widely used, but to reduce the highly toxic arsenic-containing waste residue to the standard, a large amount of cement needs to be added, and the volume after treatment is often increased by 2-5 times compared with the original one. Landfilling and stockpiling create a heavy burden

Method used

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  • A process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue
  • A process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue
  • A process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue

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Effect test

Embodiment 1

[0031] combine figure 1 , a system for electric field synergistic stabilization treatment of polyvalent arsenic-containing waste slag provided by the present invention is described:

[0032] A system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste residue, comprising: a reaction tank body 100, which is provided with a waste residue feed port 110, an oxidant feed port 120, a stabilizer feed port 130, an infiltration tank body 100, Filtrate outlet 140 and waste outlet 150. The waste slag feed port 110 is connected with the first pipeline 112 with the belt conveyor 111; the oxidant feed port 120 is connected with the second pipeline 122 with the metering pump 121, and the oxidant discharge port 120 is also provided with a nozzle 123, and the nozzle 123 is placed Inside the reaction tank body 100 ; the stabilizer feeding port 130 is connected to the third pipeline 132 with a screw conveyor 131 . The first pipeline 112, the second pi...

Embodiment 2

[0039] The present invention also provides a process for treating polyvalent arsenic-containing waste slag through electric field synergistic stabilization, comprising the following steps:

[0040] Step 1: Add an oxidizing agent to the arsenic-containing waste residue with a water content of 50%-70% and stir to oxidize the arsenic; while adding the oxidant, apply an electric field to the arsenic-containing waste residue, the cathode of the electric field is located in the middle of the arsenic-containing waste residue, and the anode It is located around the arsenic-containing waste slag so that the anions in the arsenic-containing waste slag migrate to the anode. Wherein, the ratio of the added volume of the oxidizing agent to the volume of arsenic in the arsenic-containing waste residue is less than or equal to 1:10, the oxidizing agent includes one or more of potassium permanganate solution and hydrogen peroxide solution, and the mass fraction of the oxidizing agent is 10%-30...

Embodiment 3

[0049] refer to figure 2 , Figure 4 , and combined with the system for treating arsenic-containing waste slag provided by the present invention, the process of electric field synergistic stabilization for treating polyvalent arsenic-containing waste slag is described in detail.

[0050] Step 1: The arsenic-containing waste residue is transported to the waste residue feed port 110 by the belt conveyor 111 and enters the reaction tank 100 . Wherein, the belt conveyor 111 is connected with the electronic weighing scale 190, and the electronic measuring pump 190 measures the increased weight of the reaction tank body 100. When the increased weight of the reaction tank body 100 reaches a predetermined setting value, the electronic weighing scale 190 feeds back an electronic signal to close the belt. The conveyor 111 stops the conveyance of the arsenic-containing waste slag, so that the purpose of measuring the arsenic-containing waste slag is achieved.

[0051] Step 2: Start th...

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Abstract

The invention provides a process and system for electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue. The method comprises the following steps: step 1: adding an oxidizing agent into the arsenic-containing waste residue with a water content being 50-70% and stirring to enable arsenic to be subjected to oxidizing reaction; applying an electric field to the arsenic-containing waste residue while adding the oxidizing agent, wherein a cathode of the electric field is positioned in the middle of the arsenic-containing waste residue, and an anode is positioned around the arsenic-containing waste residue, such that anions in the anion are migrated and aggregated to the anode; step 2: removing the electric field after the oxidizing reaction of the arsenic in the arsenic-containing waste residue is finished, then adding a stabilizing agent into the arsenic-containing waste residue and stirring, such that the arsenic in the arsenic-containing waste residue is reacted to be stabilized, and therefore, an arsenic compound that exists stably is obtained, wherein in the steps 1 and 2, percolate of the arsenic-containing waste residue is always filtered and collected. The process for the electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue is low in cost and wide in processing range, and the processed arsenic-containing waste residue is small in capacity-increase ratio and has no secondary pollution.

Description

technical field [0001] The invention relates to the field of waste slag treatment, in particular to a process and system for electric field synergistic stabilization treatment of multivalent arsenic-containing waste slag. Background technique [0002] The waste residue produced by the mining, dressing and smelting industry has a large output and high heavy metal leaching toxicity. With the gradual depletion of high-grade mineral resources, the new pollution source of arsenic-containing heavy metal solid waste discharged during the production process of the mining, dressing and smelting industry will be further highlighted. For example, tailings produced in the mining and beneficiation process, arsenic soot produced in the smelting process, arsenic-alkali slag, polluted acid slag, arsenic filter cake and other arsenic-containing waste residues will increase and pile up like mountains. If these arsenic-containing waste residues are not properly disposed of in a timely manner, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/11A62D101/43
CPCA62D3/11A62D2101/43
Inventor 陈润华柴喜林张金龙黄通锦王世君
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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