Conclusions and Recommendations

Main Research Conclusions

Through a systematic study of the application of diatomaceous earth in the sulfuric acid industry, the following main conclusions were drawn:

Application Scenario Analysis Conclusions:

1. The application of diatomaceous earth in the sulfuric acid industry mainly focuses on three aspects: catalyst support, filtration system, and auxiliary processes.
2. As a vanadium catalyst support, diatomaceous earth plays an irreplaceable role; a high-quality support can ensure stable catalyst operation for several years.
3. In filtration applications, diatomaceous earth filter aids can effectively remove fine particles of 0.5μm, but problems such as filter cloth wear exist.
4. In drying and auxiliary processes, diatomaceous earth is mainly used for waste acid treatment and the adsorption of harmful liquids.

Algae Type Technical Requirements Conclusions:

1. The most suitable algae types for catalyst support are: linear algae, round sieve algae, crown-disc algae, small ring algae, and arachnid algae, among which linear algae have the best pore structure.
2. The pore size distribution of different algae types varies significantly: linear algae have a pore size of approximately 0.1μm, round sieve algae have a central pore size of 5μm and an edge pore size of 2μm, with an overall pore size range of... 0.1-3.0μm

3. Basic requirements for diatomaceous earth used as catalyst support: SiO₂>65% (high-quality >90%), Fe₂O₃<1%-4%, loss on ignition <10%, specific surface area ≥20 m²/g

Performance evaluation conclusions:

1. Diatomaceous earth from Changbai and Linjiang in Jilin Province and Tengchong in Yunnan Province is of high silicon and low iron type, suitable for producing high-purity products.

Although diatomaceous earth from Linqu in Shandong Province and Xundian in Yunnan Province has a lower silicon content, it has a larger specific surface area, which is advantageous in certain catalytic applications.

2. The main difference between domestic and imported diatomaceous earth products lies in the narrower pore size distribution range, which needs to be improved through modification technology.

Recommendations for sulfuric acid enterprises

Based on the research conclusions, the following recommendations are made for sulfuric acid enterprises:

Raw material selection recommendations:

1. Select appropriate diatomaceous earth products according to specific application scenarios. 1. For catalyst supports, prioritize high-silica, low-iron diatomaceous earth from Jilin Changbai and Yunnan Tengchong; for filtration applications, choose high-specific-surface-area diatomaceous earth from Shandong Linqi.

2. Establish a raw material quality evaluation system, focusing on testing key indicators such as SiO₂ content, pore size distribution, and specific surface area.

3. Consider establishing long-term cooperative relationships with diatomaceous earth suppliers to ensure the stability of raw material quality.

Application Technology Recommendations:

1. In catalyst support applications, it is recommended to use modified diatomaceous earth to improve performance. Electron beam bombardment modification or ultrasonic treatment with dilute sulfuric acid are recommended techniques.

2. In filtration applications, it is recommended to use pre-coating + Add the following methods, and pay attention to controlling the filtration pressure and flow rate to extend the service life of the filter cloth.

3. Establish an application effect evaluation system and regularly test key indicators such as catalyst activity and filtration efficiency.

Technical Innovation Suggestions:

1. Actively pay attention to the development of new diatomaceous earth modification technologies, such as microwave calcination and low-temperature activation green processing technologies.

2. Explore the application of diatomaceous earth in emerging fields, such as carbon dioxide capture and waste gas purification.

3. Strengthen cooperation with research institutes to jointly develop special diatomaceous earth products suitable for enterprise needs.

Sustainable Development Suggestions:

1. Adopt clean production technologies to reduce environmental pollution during the production process.

2. Establish a waste recycling system to improve resource utilization efficiency.

3. Pay attention to changes in industry standards and policies, and regulations to ensure that products meet environmental protection requirements.

Future Research Directions

Based on the limitations of current research and the needs of industry development, it is recommended that the following directions be the focus of future research:

In-depth research on the relationship between algal type and sexuality:

1. Systematically study diatomaceous earth of different algal types. 1. Microstructural characteristics of diatomaceous earth and their relationship with macroscopic properties

2. Establishing a quantitative relationship model between algal composition and application performance

3. Developing a quality evaluation method for diatomaceous earth based on algal characteristics

Optimization research of modification technologies:

1. Developing more efficient and environmentally friendly diatomaceous earth modification technologies

2. Studying the synergistic effects of multiple modification methods

3. Establishing a rapid evaluation method for modification effects

Innovation research of application technologies:

1. Exploring the application of diatomaceous earth in new sulfuric acid production processes

2. Developing the application of diatomaceous earth-based composite materials in the sulfuric acid industry

3. Studying the application of intelligent monitoring and control technologies in diatomaceous earth applications

Research on the improvement of the standard system:

1. Establishing and improving the standard system for the application of diatomaceous earth in the sulfuric acid industry

2. Formulating technical specifications and quality requirements for different application scenarios

3. Promoting the alignment of industry standards with international standards

Through these in-depth studies, the application level of diatomaceous earth in the sulfuric acid industry will be further improved, promoting the sustainable development of the sulfuric acid industry.