Lithium slag is the residue discharged during the production of lithium salt from lithium ore (lepidolite, spodumene). The lithium slag particles produced by the existing process of extracting lithium salt from lithium ore are very fine, and the discharge and stacking will pollute the surrounding environment with dust and seriously affect the normal life of local residents. At the same time, the outflow of slag water containing acid and alkali affects the ecological balance of surrounding areas. Therefore, how to realize the resource utilization of lithium slag is an urgent problem to be solved at present. What is the reason for the low utilization rate of lithium slag? How to realize the comprehensive utilization of lithium slag solid waste resources? Guilin Hongcheng is a manufacturer of hlm lithium slag vertical mill. The hlm lithium slag vertical grinding mill we produce provides good equipment for the comprehensive utilization of lithium slag solid waste resources. Today, I will introduce you to the comprehensive utilization method and process of lithium slag solid waste resources.
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What is the reason for the low utilization rate of lithium slag? At present, the research on the resource utilization of lithium slag is mainly used in the field of building materials such as the preparation of cement or concrete-related materials, but it is difficult to achieve large-scale production. The reasons for the low utilization rate of lithium slag are:
(1) Different companies have different processes for producing lithium salts, resulting in complex and changeable properties of lithium slag raw materials, which cannot be used in large-scale production in a unified manner;
(2) The residual sulfur content of the acid lithium slag exceeds the standard, and the sulfur content of each batch is uneven, so it is difficult to meet the national standard of concrete admixture stably and is harmless to the performance of concrete;
(3) Lithium slag particles are small, have a large internal specific surface area, and the porous structure has a large adsorption capacity for water;
(4) The addition of lithium slag to cement or concrete will reduce the strength, bleeding, segregation resistance, frost resistance, and carbonation resistance of the concrete.
So, what are the comprehensive utilization methods of lithium slag solid waste resources? For lithium slag, use dilution neutralization method and heat treatment chemical replacement method. And the introduction of grinding aid water reducer and activator in the grinding stage makes lithium slag can be used as mineral admixture in concrete, which is one of the ideal ways to realize the comprehensive utilization of lithium slag solid waste resources.
Comprehensive utilization method of lithium slag solid waste resources:
1. Add one or any combination of sodium carbonate, sodium bicarbonate, sodium hydroxide and quicklime to the lithium slag, mix and stir the additives, adjust the pH value to 7-9, and separate the lithium slag with a centrifuge;
2. The desulfurization additive accounting for 2-6% by weight of the lithium slag is added to the lithium slag, heated to 300-600°C for 0.5-1h in a rotary kiln, dehydrated and desulfurized, and the pH value is increased to 8-10;
3. Use the vertical mill system to vertically grind the lithium slag to a certain particle size, then add an activator to stimulate the pozzolanic activity of the lithium slag;
4. The excited lithium slag is added with grinding aid and water reducing agent for grinding, and the finished product is obtained after grinding to the required particle size.
In the comprehensive utilization process of lithium slag solid waste resources, grinding is the main process. The desulfurized lithium slag is mechanically ground until the particle size of the lithium slag is greater than 150 meshes, and then an activator is added to stimulate the pozzolanic activity of the lithium slag. After lithium slag with high pozzolanic activity is added to concrete as a mineral admixture, it will react with calcium hydroxide to form a gelling product under the excitation of alkaline substances such as concrete. It can not only reduce the amount of clinker in concrete, but also improve the structure and performance of the concrete substrate.
As an important equipment in the grinding process of comprehensive utilization of lithium slag solid waste resources, hlm lithium slag vertical mill plays an important role in the comprehensive utilization of lithium slag solid waste resources. If you have project requirements for comprehensive utilization of lithium slag solid waste resources, and want to know more about hlm lithium slag vertical mill equipment, please leave us a message.
