Method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag

A cr-ni-mn, stainless steel slag technology, applied in the field of synergistic solidification of heavy metals Cr, Ni, Mn, can solve the problems of affecting the stability and safety of building materials, limit the application field and utilization rate of stainless steel slag, and achieve no Harmful treatment, large amount of introduction, and the effect of reducing environmental pressure

Pending Publication Date: 2022-07-05
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the harmless treatment of stainless steel slag, treatment processes such as dry reduction, wet recovery, and solidification and storage have been developed at home and abroad. However, due to the risk of re-elution of heavy metals after the above methods, the expected effect cannot be achieved; in stainless steel slag In terms of resource uti

Method used

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  • Method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag
  • Method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag
  • Method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for synergistic solidification of heavy metals Cr-Ni-Mn in stainless steel slag, the specific steps are as follows:

[0043] (1) Preparation of the mixture: the design uses diopside as the main crystal phase, and different SiO 2 / Al 2 O 3 The basic glass formulation (see Table 1 for the basic composition of glass ceramics). Using stainless steel slag as the main raw material (main chemical composition is shown in Table 2), and the addition amount is 60% (wt%), with an appropriate amount of auxiliary raw materials such as quartz sand, alumina, soda ash, etc., calculate the raw material composition of glass ceramics (raw material composition See Table 3), weigh the raw materials according to the raw material composition of the glass ceramics and mix them uniformly.

[0044] Table 1 Different SiO 2 / Al 2 O 3 The basic composition formula of glass ceramics (wt.%)

[0045]

[0046] Attached: # TO x : T=Cr, Ni, Mn (ie TO x The content of : Cr 2 O 3 , N...

Embodiment 2

[0060] At the same time, only the crystallization heat treatment temperature in step (3) was changed (the crystallization temperature was 830° C.), and other conditions such as the basic component formula, raw material composition and preparation method of the glass ceramics were the same as those in Example 1, and the results obtained under different heat treatment temperatures were obtained. glass ceramics.

[0061] Leaching test of heavy metals in glass ceramics: Toxic metal testing of glass ceramics is carried out with reference to the standard HJ / T299-2007 "Toxic Leaching Method: Sulfuric Acid and Nitric Acid Method". 0-0.15ppm and 0.26-0.87ppm (eg Figure 4 a), all lower than the standard values ​​of 15ppm (Cr), 5ppm (Ni) and 5ppm (Mn).

[0062] The X-ray diffraction pattern of the glass ceramics obtained in the present embodiment is analyzed, and the results are as follows image 3 (a).

[0063] Depend on image 3 (a) It can be seen that the main crystal phases of t...

Embodiment 3

[0065] A method for synergistic solidification of heavy metals Cr-Ni-Mn in stainless steel slag, the specific steps are as follows:

[0066] (1) Preparation of mixture: Design the basic glass formula of diopside / pyxene phase, wherein the weight percentage of each component is composed of: SiO 2 47%, Al 2 O 3 6.3%, CaO 28.5%, MgO 4.2%, CaF 2 3.2%, Fe 2 O 3 3.6%, Na 2 O+K 2 O 2.6%, TO X (T=Cr, Ni, Mn) 2.1%, Rest (P 2 O 5 , TiO 2 , BaO and other impurity components) 2.5%. Using stainless steel slag as the main raw material (see Table 2 for its main chemical composition), and the addition amount of 70% (wt%), with an appropriate amount of auxiliary raw materials such as quartz sand and soda ash, calculate the raw material composition of glass ceramics (see Table 4 for raw material composition) ), weigh the raw materials according to the raw material composition of glass ceramics and mix them evenly;

[0067] Table 4 Raw material composition of glass ceramics (wt.%) ...

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Abstract

The invention relates to a method for synergistically curing heavy metal Cr-Ni-Mn in stainless steel slag by using glass ceramic, the prepared glass ceramic is composed of spinel, diopside/pyroxene and a glass phase, the heavy metal Cr and Mn are cured in the spinel and induce the diopside/pyroxene to crystallize, and the heavy metal Ni is cured in the pyroxene crystal phase. The method comprises the steps of mixture preparation, basic glass formation, glass ceramic material preparation, heavy metal toxicity leaching evaluation and the like. By virtue of a glass ceramic preparation technology, harmful heavy metals Cr and Mn in the stainless steel slag are utilized to form spinel to induce diopside and Ni-containing pyroxene crystal phases to be separated out, and the synergistic curing effect of Cr, Ni and Mn in the stainless steel slag is exerted, so that harmless treatment of the stainless steel slag is realized; the prepared glass ceramic material can be widely applied to industries such as electric power, chemical engineering, coal and ferrous metallurgy, and resource utilization of the stainless steel slag is realized. And meanwhile, a new thought is provided for harmless treatment and resource utilization of industrial solid wastes such as smelting slag, tailings and incineration ash containing harmful heavy metal elements.

Description

technical field [0001] The invention relates to a method for the synergistic solidification of heavy metals Cr-Ni-Mn in stainless steel slag, in particular to a method for solidifying heavy metals Cr and Mn in stainless steel slag into spinel by using glass ceramics and inducing Ni-containing pyroxene to crystallize, synergistically A method for solidifying heavy metals Cr, Ni, and Mn. Background technique [0002] my country is one of the countries with the largest amount of solid waste in the world. More than 10 billion tons of solid waste are newly added every year in the country, and the total historical stockpile is as high as 60-70 billion tons. The environmental protection problems caused by solid waste have become popular among the people. The pain, the suffering of people's livelihood. Therefore, it is urgent to vigorously promote the harmless treatment and resource utilization of solid waste resources. [0003] Stainless steel slag is the waste slag containing Cr,...

Claims

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Application Information

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IPC IPC(8): C03C10/16C03C10/06C03B19/02C03B32/02
CPCC03C10/0063C03C10/16C03B19/02C03B32/02Y02P10/20
Inventor 邓磊波张明星马永红李浩杜永胜张美荣芦文伟姚彬付哲
Owner INNER MONGOLIA UNIV OF SCI & TECH
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