Combined recycling method for solid hazardous waste and liquid hazardous waste

Abstract

The invention relates to the technical field of industrial waste resource utilization, and discloses a solid hazardous waste and liquid hazardous waste combined recycling method which comprises the following steps: dividing hazardous wastes into high-water-content low-chlorine solid wastes, low-water-content powdery low-chlorine solid wastes, low-water-content blocky low-chlorine solid wastes, high-chlorine solid wastes, low-calorific-value organic waste liquids and high-calorific-value organic waste liquids; mixing and granulating the high-water-content low-chlorine solid waste drying product, the high-chlorine solid waste dechlorination product, the low-calorific-value organic waste liquid and the low-water-content powdery low-chlorine solid waste to obtain a granulated material; the granulation material and the low-water-content blocky low-chlorine solid waste crushed product are put into a suspension smelting furnace, high-calorific-value organic waste liquid and oxygen-enriched air are introduced, suspension smelting is conducted, copper matte, molten slag and smoke are discharged, and the smoke is subjected to gradient treatment. According to the method, various solid and liquid hazardous wastes can be co-processed, rare and precious valuable metals and iron, silicon and calcium elements in the hazardous wastes can be recycled, the characteristics of various hazardous wastes can be fully utilized, and the use of fuels and reducing agents is reduced.

Claims

1. A method for the combined resource recovery of solid hazardous waste and liquid hazardous waste, characterized in that: include: S1: Hazardous waste is classified into high-water-content low-chloride solid waste, low-water-content powdered low-chloride solid waste, low-water-content blocky low-chloride solid waste, high-chloride solid waste, low-calorific value organic waste liquid and high-calorific value organic waste liquid; S2: mixing and granulating a high-water-content low-chloride solid waste drying product, a high-chloride solid waste dechlorination product, a low-calorific value organic waste liquid, and a low-water-content powdered low-chloride solid waste to obtain a granulated material; S3: In the suspension smelting furnace, pelletized materials and crushed products of low-water-content, blocky, and low-chloride solid waste are added from the top, and high-calorific value organic waste liquid and oxygen-enriched air are introduced to carry out suspension smelting, and copper matte, slag, and flue gas are discharged; S4: The flue gas discharged from the suspension smelting furnace is subjected to cascade treatment.

2. The method according to claim 1, characterized in that In step S1, among various types of hazardous waste, low chlorine means the chlorine content is not higher than 5wt%, high chlorine means the chlorine content is higher than 5wt%; low water content means the water content is not higher than 40wt%, high water content means the water content is higher than 40wt%; powder means the particle size is not greater than 20mm, and block means the particle size is greater than 20mm; low calorific value means the calorific value is not higher than 2000kcal / kg, and high calorific value means the calorific value is higher than 2000kcal / kg.

3. The method according to claim 1, characterized in that In steps S2 and S3, the water content of the high-chloride solid waste dechlorination product is 20-30wt%, and the chlorine content is less than 2wt%; the water content of the high-water-content low-chloride solid waste drying product is 20-30wt%; and the particle size of the low-water-content block-shaped low-chloride solid waste crushed product is 2-5mm.

4. The method according to claim 1 or 3, characterized in that In step S2, the preparation method of the high-chloride solid waste chlorine removal product is as follows: after the high-chloride solid waste is slurried, the solid-liquid separation is performed, the pH of the obtained liquid is adjusted to 10-11 with an alkaline inorganic waste liquid, sodium sulfide, ferrous chloride, a flocculant and a coagulant aid are added, flocculation and precipitation are performed, and then the solid-liquid separation is performed. The pH of the obtained liquid is adjusted to 7-8, and evaporation crystallization, thickening and drying are performed to obtain a crystalline salt; the solid separated from the two solid-liquid separations is the high-chloride solid waste chlorine removal product.

5. The method according to claim 1, wherein In the process of preparing the high-water-content, low-chlorine solid waste drying product and the low-water-content, low-chlorine block solid waste crushed product, smoke dust in the tail gas is collected, and the smoke dust is mixed with the high-water-content, low-chlorine solid waste drying product, the high-chlorine solid waste dechlorination product, the low calorific value organic waste liquid and the low-water-content, low-chlorine powdered solid waste for granulation in step S2.

6. The method according to claim 5, characterized in that The specific process of step S2 includes: mixing low-water-content powdered low-chloride solid waste, low-calorific value organic waste liquid and smoke to obtain a premix; mixing the premix, a high-water-content low-chloride solid waste drying product and a high-chloride solid waste dechlorination product to obtain a granulated material.

7. The method according to claim 1, characterized in that In step S3, during the suspension smelting process, a carbon-based reducing agent and auxiliary materials containing one or more elements of silicon, calcium and iron are added from the top of the suspension smelting furnace.

8. The method according to claim 1, characterized in that In step S3, in the suspension smelting furnace, the suspension smelting temperature is 1250-1350°C, the matte discharge temperature is 1150-1230°C, the slag discharge temperature is 1220-1300°C, and the outlet flue gas temperature is 1100-1200°C.

9. The method according to claim 1, characterized in that In step S3, the furnace body of the suspension smelting furnace is provided with a copper jacket I, a copper jacket II, a molten steel jacket I and a molten steel jacket II in sequence from bottom to top; an air inlet I is provided on the furnace body at the same height as the copper jacket I, and an air inlet II is provided at the same height as the molten steel jacket II; at least one submerged combustion lance is provided in the furnace body at the same height as the copper jacket I; during the suspension smelting process, oxygen-enriched air is introduced from the air inlet I, the air inlet II and the submerged combustion lance, and the atomized high calorific value organic waste liquid is introduced from the submerged combustion lance.

10. The method according to claim 1, characterized in that In step S4, the process of cascade treatment of the flue gas discharged from the suspension smelting furnace includes: combustion, contact with urea for SNCR denitrification, water spraying for rapid cooling, contact with Ca(OH)2 for dry deacidification, activated carbon adsorption purification, dust removal, contact with alkaline liquid for wet desulfurization and deacidification, wet electrostatic demisting, and contact with ammonia for SCR denitrification.

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