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Method for making copper slag gel be wrapped around and stabilize scorodite

A scorodite and stabilization technology, applied in chemical instruments and methods, transportation and packaging, solid waste removal, etc., can solve the problems of scorodite and other problems, achieve low production cost, reduce complexity, and broad market foreground effect

Inactive Publication Date: 2020-04-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, there is no application of copper slag wrapped stabilized scorodite

Method used

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  • Method for making copper slag gel be wrapped around and stabilize scorodite
  • Method for making copper slag gel be wrapped around and stabilize scorodite
  • Method for making copper slag gel be wrapped around and stabilize scorodite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: The composition of magnetite in this example is shown in Table 1, and the composition of copper slag is shown in Table 2. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of arsenic after washing the smelting flue gas. The dirty acid of impurity such as, main composition is as shown in table 3;

[0026] Table 1 Magnetite Composition

[0027]

[0028] A method for wrapping and stabilizing scorodite with copper slag gel, the specific steps are as follows:

[0029] (1) Sieve the ground magnetite, and get 200 mesh sieves to obtain magnetite slag powder;

[0030] (2) Combine step (1) magnetite slag powder and H 2 o 2 Add it into the dirty acid and mix evenly, and stir the oxidation pretreatment reaction at normal pressure and room temperature for 6 hours to obtain a solid-liquid mixture; where H 2 o 2 The molar ratio of the arsenic to the dirty acid is 1.2:1, the arsenic content of the...

Embodiment 2

[0039] Example 2: The composition of magnetite in this example is shown in Table 6, and the composition of copper slag is shown in Table 7. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of arsenic after washing the smelting flue gas. The dirty acid of impurity such as, main composition is as shown in table 8;

[0040] Table 6 magnetite composition

[0041]

[0042] A method for wrapping and stabilizing scorodite with copper slag gel, the specific steps are as follows:

[0043] (1) Sieve the ground magnetite, and get 200 mesh sieves to obtain magnetite slag powder;

[0044] (2) Combine step (1) magnetite slag powder and H 2 o 2 Add it into the dirty acid and mix evenly, and stir the oxidation pretreatment reaction at normal pressure and room temperature for 8 hours to obtain a solid-liquid mixture; where H 2 o 2 The molar ratio of the arsenic to the dirty acid is 1.1:1, the arsenic content of the...

Embodiment 3

[0053] Example 3: The composition of magnetite in this example is shown in Table 6, and the composition of copper slag is shown in Table 7. The dirty acid comes from the sulfuric acid workshop of a zinc smelter in Southwest China, which contains a large amount of arsenic after washing the smelting flue gas. The dirty acid of impurity such as, main composition is as shown in table 8;

[0054] The magnetite composition of this embodiment is as shown in Table 11, and the copper slag composition is as shown in Table 12. The sewage acid comes from the sewage containing a large amount of impurities such as arsenic produced after the sulfuric acid workshop of a certain zinc smelter in Southwest China washes the smelting flue gas. Acid, the main components are as shown in Table 13;

[0055] Table 11 magnetite composition

[0056]

[0057] A method for wrapping and stabilizing scorodite with copper slag gel, the specific steps are as follows:

[0058] (1) Sieve the ground magnetit...

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Abstract

The invention relates to a method for making copper slag gel be wrapped around and stabilize scorodite, and belongs to the technical field of heavy metal pollution treatment. The method comprises thefollowing steps that ground magnetite is screened to obtain magnetite slag powder; the magnetite slag powder and H2O2 are added into waste acid for uniform mixing, and stirring is performed for an oxidation pretreatment reaction for 6 h to 8 h under normal pressure at room temperature to obtain a solid-liquid mixture; the pH value of the solid-liquid mixture is adjusted to be 1.3 to 1.7, stirringis performed for the arsenic removal reaction for 12 h to 14 h under normal pressure at the temperature of 85 DEG C to 95 DEG C, solid-liquid separation is performed to obtain arsenic-containing magnetite and a filtrate, and the filtrate undergoes deep arsenic removal treatment; the arsenic-containing magnetite is dried, and then undergoes magnetic separation, so that the magnetite and the scorodite are separated out, and the magnetite returns back for the oxidation pretreatment reaction; a H2SO4 solution is slowly added into copper slag powder to be stirred until the copper slag gel is formed; and the copper slag gel and the scorodite are uniformly mixed to obtain copper slag-scorodite gel, and aging is performed for 10 h to 20 h at the temperature of 120 DEG C to 160 DEG C. According tothe method, the copper slag is adopted to be wrapped around the scorodite, then the gel is formed, and the subsequent stabilization treatment of the scorodite is realized.

Description

technical field [0001] The invention relates to a method for wrapping and stabilizing scorodite with copper slag gel, and belongs to the technical field of heavy metal pollution control. Background technique [0002] Arsenic is a metalloid substance that can form a series of highly toxic compounds. Arsenic can be absorbed by the human body through the respiratory tract, skin and digestive tract, and can cause neurasthenia syndrome and skin and mucous membrane lesions. Arsenic’s inorganic compounds can cause lung cancer and skin diseases. cancer. Factories will discharge a large amount of these arsenic-containing substances through industrial production. For the treatment of arsenic-containing waste, the best prospect at present is to use Fe and As to generate scorodite. Although the toxic leaching of scorodite produced by this method is within the range specified by the national standard (<5mg / L), its toxic leaching still reaches 3~4 mg / L. In order to further reduce its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C22B1/11
CPCB09B5/00C22B1/11B09B3/20
Inventor 祁先进李雪竹祝星王华杨妮娜
Owner KUNMING UNIV OF SCI & TECH
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