CN-121988302-A - Preparation method and application of adsorption material based on silicon product in silicon-manganese slag

Abstract

The invention relates to a preparation method of an adsorption material based on a silicon product in silicon-manganese slag, which comprises the following steps of (1) preparing silicon-manganese slag powder, (2) acid leaching treatment, obtaining silicon-containing liquid through centrifugal separation after the acid leaching treatment, (3) extracting the silicon product and (4) preparing the adsorption material. The adsorption material is prepared based on a silicon product in the silicon-manganese slag, has a remarkable porous structure, is formed by arranging silicon oxygen tetrahedron (SiO 4 ) and a calcium ion layer, is rich in exchangeable Ca 2+ between layers, provides a structural channel for migration and fixation of heavy metal ions, and has multiple functions of ion exchange, surface complexation, chemical precipitation, electrostatic attraction and the like. Under acidic conditions, the adsorbent has extremely high adsorption capacity for Ca 2+ and Mn 2+ , which is far superior to many commercial adsorbents.

Inventors

• LONG TENGFA
• LIU QINGYUAN
• LU WENZHUO
• HE YICHAO
• HUANG ZHONGYUAN
• Gan Rongmiao
• LIU WANTING
• YANG XINRU

Assignees

• 广西师范大学

Dates

Publication Date

20260508

Application Date

20260205

Claims (9)

1. 1. The preparation method of the adsorption material based on the silicon product in the silicon-manganese slag is characterized by comprising the following steps: (1) Preparing silicon-manganese slag powder, namely sequentially drying, ball-milling and screening the silicon-manganese slag to obtain the silicon-manganese slag powder; (2) Acid leaching, namely acid leaching the silicon-manganese slag powder obtained in the step (1) by using sulfuric acid solution, and obtaining silicon-containing liquid through centrifugal separation after the acid leaching; (3) Extracting silicon products, namely extracting the silicon products from silicon-containing liquid, washing the silicon products by pure water to remove residual acid liquor, and drying the washed silicon products; (4) And (3) preparing an adsorption material, namely roasting a dried silicon product, extracting the roasted product, mixing the roasted product with calcium oxide, and synthesizing the adsorption material through a hydrothermal reaction.
2. 2. The method for preparing the adsorption material based on the silicon product in the silicon-manganese slag, which is disclosed in claim 1, is characterized in that in the step (1), the particle size of the silicon-manganese slag powder obtained by screening is 100-200 meshes.
3. 3. The method for preparing the adsorption material based on the silicon product in the silicon-manganese slag, as set forth in claim 1, wherein in the step (2), the concentration of the sulfuric acid solution is 2-4mol/L.
4. 4. The method for preparing the adsorption material based on the silicon product in the silicon-manganese slag, which is characterized in that in the step (2), the solid-to-liquid ratio of acid leaching treatment of the silicon-manganese slag powder by sulfuric acid solution is 1g:8-12ml.
5. 5. The method of claim 1, wherein in the step (3), the temperature of extracting the silicon product from the silicon-containing liquid is 30-50 ℃.
6. 6. The method for preparing the adsorption material based on the silicon product in the silicon-manganese slag, as set forth in claim 1, wherein in the step (4), the roasting temperature of the silicon product is 550-650 ℃ and the roasting time is 4-8h.
7. 7. The method for preparing the adsorption material based on the silicon product in the silicon-manganese slag, as set forth in claim 1, wherein in the step (4), the molar ratio of the roasting product to the calcium oxide is 1:0.8-1.2, and the hydrothermal reaction temperature is 120-180 ℃.
8. 8. The method for preparing the material according to any one of claims 1 to 7, wherein the adsorption material is used for adsorbing cadmium and manganese in wastewater.
9. 9. The method according to claim 8, wherein the amount of the adsorbent added to the wastewater is 0.2-4g/L, and the pH of the adsorbent is 4.

Description

Preparation method and application of adsorption material based on silicon product in silicon-manganese slag Technical Field The invention belongs to the technical field of solid waste recycling and water treatment, and particularly relates to a preparation method and application of an adsorption material based on a silicon product in silicon-manganese slag. Background The silicomanganese slag is a main solid byproduct generated in the silicomanganese alloy smelting process. With the continuous increase of global steel production, the annual discharge amount of the steel is continuously rising, and the steel has become a class of massive industrial solid wastes which need to be effectively treated and recycled. From the resource attribute, the silicon-manganese slag is rich in silicon dioxide (the SiO 2 content is usually 20-30wt%) and contains a small amount of reactive elements such as manganese, magnesium and the like, which provides inherent potential for the resource utilization. The method has the advantages that the components mainly comprise oxides of silicon, calcium, aluminum and the like, the method has a substance basis for converting the oxides into silicon-based functional materials, and the method has wide sources and low cost, and has the economic feasibility of realizing waste treatment by waste. However, the existing utilization way still has obvious bottlenecks that on one hand, the traditional wet extraction process is easy to generate acid wastewater containing Cd, pb and other heavy metals in the process of recovering valuable metals, so that the subsequent pollution control cost is increased by more than 50%, and on the other hand, the content of glass phase in the silicomanganese slag is high (usually more than 70%), the structure is stable, active components are difficult to release, and the application effect and the heavy metal stable solidifying capability in the construction material field are severely restricted. In the aspect of water treatment, the wastewater containing cadmium and manganese forms a serious threat to the ecological environment and human health. Cadmium has strong bioaccumulation and toxicity, and excessive manganese ingestion can lead to damage to the nervous system. The traditional treatment method such as chemical precipitation, ion exchange, membrane separation and the like can remove heavy metals to a certain extent, but generally has the problems of limited treatment efficiency, high operation cost, easiness in generating secondary pollution such as heavy metal-containing sludge and the like. Therefore, the development of the method capable of cooperatively realizing high-value conversion of the silicomanganese slag and high-efficiency removal of the heavy metal has important environmental and economic significance. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a preparation method and application of an adsorption material based on a silicon product in silicon-manganese slag. The preparation method and the application of the invention can cooperatively realize high-value conversion of the silicomanganese slag and high-efficiency removal of heavy metals. In order to achieve the aim, the technical scheme adopted by the invention is that the preparation method of the adsorption material based on the silicon product in the silicon-manganese slag is provided, and the innovation point is that the preparation method comprises the following steps: (1) Preparing silicon-manganese slag powder, namely sequentially drying, ball-milling and screening the silicon-manganese slag to obtain the silicon-manganese slag powder; (2) Acid leaching, namely acid leaching the silicon-manganese slag powder obtained in the step (1) by using sulfuric acid solution, and obtaining silicon-containing liquid through centrifugal separation after the acid leaching; (3) Extracting silicon products, namely extracting the silicon products from silicon-containing liquid, washing the silicon products by pure water to remove residual acid liquor, and drying the washed silicon products; (4) And (3) preparing an adsorption material, namely roasting a dried silicon product, extracting the roasted product, mixing the roasted product with calcium oxide, and synthesizing the adsorption material through a hydrothermal reaction. Preferably, in the step (1), the particle size of the silicon-manganese slag powder obtained by screening is 100-200 meshes. Preferably, in the step (2), the concentration of the sulfuric acid solution is 2-4mol/L. Preferably, in the step (2), the solid-to-liquid ratio of the acid leaching treatment of the silicomanganese slag powder by using a sulfuric acid solution is 1g:8-12mL. Preferably, in step (3), the set temperature for extracting the silicon product from the silicon-containing liquid is between 30 and 50 ℃. Preferably, in step (4), the calcination temperature of the silicon product in the muffle furnace is 550-650 ℃