CN-118595123-B - Multi-solid-waste co-treatment method, solid-waste mixing material and application thereof

Abstract

The invention belongs to the technical field of solid waste resource utilization, and provides a multi-solid waste cooperative treatment method, a solid waste mixture and application thereof. The multi-solid waste cooperative treatment method comprises the steps of washing phosphogypsum to obtain acid washing liquid and washed phosphogypsum, adjusting the pH value of the acid washing liquid to 7.2-8.0 by utilizing carbide slag to obtain weak alkaline washing liquid, washing electrolytic manganese slag by utilizing the weak alkaline washing liquid to obtain washed electrolytic manganese slag, ball-milling lithium slag to obtain lithium slag powder, mixing the washed phosphogypsum, the washed electrolytic manganese slag, the lithium slag powder, slag powder and carbide slag in a first stirring manner, and then adding water to carry out a second stirring and mixing manner to obtain the solid waste mixture. The method of the invention realizes the complete solidification of substances such as heavy metal ions and the like in trace impurities remained in each solid waste, and the obtained solid waste mixture is not easy to collapse and break a dam when being applied, and has low permeability of toxic elements.

Inventors

• HU BIAO
• LV WEI
• TANG TAO
• XIAO ZHIHUI
• WU XIAOYI
• WANG YUZHEN
• SU LIYANG

Assignees

• 湖北昌耀新材料股份有限公司

Dates

Publication Date

20260512

Application Date

20240627

Claims (8)

1. 1. The multi-solid waste co-treatment method is characterized by comprising the following steps of: Washing phosphogypsum with water to obtain acidic washing liquid and washed phosphogypsum; Adjusting the pH value of the acidic washing liquid to 7.2-8.0 by using carbide slag to obtain weakly alkaline washing liquid; washing the electrolytic manganese slag by using the weak alkaline washing liquid to obtain water-washed electrolytic manganese slag; ball milling is carried out on the lithium slag to obtain lithium slag powder; The washed phosphogypsum, the washed electrolytic manganese slag, the lithium slag powder, the slag powder and the carbide slag are first stirred and mixed, and then water is added for second stirring and mixing to obtain a solid waste mixture; In the water washing process, the mass ratio of phosphogypsum to water is 1:10-20; In the process of adjusting the pH value of the acidic washing liquid to 7.2-8.0 by using carbide slag, the adding amount of the carbide slag is calculated according to a formula I, wherein the formula I is as follows: carbide slag addition = volume of acidic wash solution x conversion factor of body weight; In the formula I, the unit of the adding amount of the carbide slag is kg, the unit of the volume of the acidic washing liquid is m 3 , and the weight conversion coefficient is 0.04-0.05; in the washing process, the mass ratio of the electrolytic manganese slag to the weakly alkaline washing liquid is 1:20-25; in the first stirring and mixing process, the mass ratio of the water-washed phosphogypsum, the water-washed electrolytic manganese slag, the lithium slag powder, the slag powder and the carbide slag is 40-50:15-20:20-25:5-10:3-5; In the second stirring and mixing process, the mass of water is 15-20% of the total mass of the water-washed phosphogypsum, the water-washed electrolytic manganese slag, the lithium slag powder, the slag powder and the carbide slag.
2. 2. The method according to claim 1, wherein the water washing mode is soaking and stirring, and the soaking and stirring time is 15-20 min.
3. 3. The method of claim 1, wherein the washing is performed by soaking and stirring for 5-10 min.
4. 4. The method according to claim 1, wherein the specific surface area of the lithium slag powder is 450-600 m 2 /kg.
5. 5. The method of claim 1, wherein the second stirring and mixing time is 5-10 min.
6. 6. The method of claim 1, wherein a manganese slag wash is also obtained after the washing, and wherein the manganese slag wash is used to absorb gases generated during the first and second mixing processes.
7. 7. The solid waste mixture obtained by the method according to any one of claims 1 to 6, wherein the pH value of the solid waste mixture is 11.5 to 12.5.
8. 8. Use of the solid waste admixture of claim 7 in filling of lawns, roadbeds and mines.

Description

Multi-solid-waste co-treatment method, solid-waste mixing material and application thereof Technical Field The invention relates to the technical field of solid waste resource utilization, in particular to a multi-solid waste cooperative treatment method, a solid waste mixture and application thereof. Background The industrial solid waste which has great influence on the environment and the safety mainly comprises energy sources, coal chemical fly ash, slag, smelting waste residue, coal gangue, red mud, industrial by-product gypsum, carbide slag, mining tailings and the like. Because of the limited technical level of industrial waste residue disposal in China at early stage, a great deal of industrial solid waste can only be piled up, and huge piling up amount is caused, so that not only is a great deal of land resources occupied by piling up of industrial solid waste, but also potential safety hazards such as dam break and overflow exist in a yard, meanwhile, groundwater, soil, vegetation and the like near the yard are polluted by leaching of harmful substances, and irreversible damage is brought to the environment in which human beings depend to live. Phosphogypsum is a solid waste generated in the wet-process phosphoric acid process, and the component of phosphogypsum is mainly calcium sulfate dihydrate. Phosphogypsum has complex composition, and besides calcium sulfate, phosphorus ore which is not completely decomposed, residual phosphoric acid, fluoride, acid insoluble substances, organic matters and the like, wherein the presence of fluorine and organic matters has the greatest influence on the recycling of phosphogypsum. Because of the acid leaching, sulfuration and other processes in the production process, the electrolytic manganese slag, the wastewater and the anode slime contain a large amount of soluble manganese, ammonia nitrogen, sulfides, heavy metal ions and other harmful components, the traditional stacking treatment method has caused serious damage to the environment, and the development of the electrolytic manganese industry is limited. The lithium slag is the residue discharged after the spodumene is calcined at high temperature and then the lithium carbonate clinker is extracted by a sulfuric acid method and filtered and washed. The comprehensive utilization of the lithium slag mainly has the defects of small market dosage, difficult digestion, low value, small sales radius, difficult harmless treatment of part of lithium smelting slag containing harmful elements, high content of elements such as iron, calcium, sulfur and the like, difficult high-value application and the like, so that the storage of the lithium slag severely limits the development of new energy material industry. The calcium carbide slag is waste slag which takes calcium hydroxide as a main component after the acetylene gas is prepared by the hydrolysis of calcium carbide, and has the characteristics of large production amount, strong alkalinity, difficult transportation, soil erosion and the like. At present, the solid waste is treated and utilized in a plurality of ways, but most of the solid waste products have the problems of low utilization rate, substandard environmental protection performance of the solid waste products, low market share of the products and the like. In most utilization ways of the solid waste, the high-temperature calcination treatment mode is definitely the simplest, crudely and effective, the physical property and the environmental index of the solid waste product can meet corresponding standards, but the product has low economical efficiency and market occupancy due to the excessively high energy consumption, and the structural property and the environmental protection performance of the final solid waste product are affected by the excessively high solid waste doping amount during calcination-free treatment, the excessively low solid waste doping amount means that the comprehensive utilization rate of the solid waste is low, the social benefit is not obvious, and the production cost of the product per se is excessively high due to the introduction of other high-price raw materials, and the treatment power of solid waste utilization enterprises is not strong. Disclosure of Invention In view of the above, the present invention aims to provide a method for cooperatively disposing multiple solid wastes, a solid waste mixture and applications thereof. The disposal method provided by the invention can realize comprehensive utilization of phosphogypsum, carbide slag, electrolytic manganese slag and lithium slag, and has low treatment cost, and in addition, the obtained solid waste mixture can be applied to filling of a site, a roadbed and a mine, thereby realizing recycling of solid waste. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a multi-solid waste co-treatment method, which comprises the following steps: Washin