Method of handling spent catalyst

A waste catalyst and treatment method technology, applied in the fields of metal alloy, high-temperature slag and sulfur, and oil recovery, can solve the problems of waste of resources, incomplete recovery, pollution of the atmospheric environment, etc., and achieve the effect of saving resources and avoiding secondary pollution

Inactive Publication Date: 2004-12-29
DALIAN DONGTAI INDAL WASTE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems generally exist: the recovery of valuable metals such as vanadium, molybdenum, cobalt, and nickel is not complete, and some even only recover one or two kinds of valuable metals, and the recovery rate is low, usually only 70- 80%; the waste catalyst has 5-15% oil adsorbed, and the oil is burned during incineration, which not only wastes valuable resources, but also produces black smoke, sulfur dioxide gas, etc. to pollute the atmospheric environment; the sulfur in the waste catalyst acts as The waste is disposed of, and in the process of incineration and oxidation roasting, elemental sulfur and sulfur in metal sulfides are oxidized and transformed into sulfur dioxide to pollute the atmospheric environment and cause secondary pollution; the treated alumina residue, and the treatment The previous waste catalyst is equivalent, and there is no significant reduction in weight and volume, and the alumina waste residue contains about 40% water, and there are no leached heavy metal salts such as cobalt, nickel, molybdenum, vanadium, etc., which are toxic and still belong to hazardous waste. It is usually stored for a long time or discharged directly as ordinary garbage, which may cause serious secondary pollution
To sum up, it can be seen that the current treatment methods and technologies have not carried out harmless treatment of spent catalysts, the metal recovery rate is low and the secondary environmental pollution is serious, which needs to be improved and perfected

Method used

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  • Method of handling spent catalyst
  • Method of handling spent catalyst

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Experimental program
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Embodiment 1

[0019] The spent catalysts in petroleum refining are treated according to the following process:

[0020] 1. Pretreatment: Send the spent catalyst A to the sieving machine 01 for screening, and sieve out the inert ceramic balls H mixed in the spent catalyst to obtain the spent catalyst B with particles smaller than 20×20mm.

[0021] 2. Dry distillation: Send the spent catalyst B to the lifting hopper, lift it through the lifting hopper, send the spent catalyst B to the dry distillation equipment feed hopper 02, and then supply it to the dry distillation device 03, and keep the temperature in the dry distillation device 03 at 500-600 ℃, the spent catalyst B is continuously retorted for 2 hours, and converted into spent catalyst C after dehydration, deoiling and desulfurization, transported to the discharge hopper of the retort equipment, and the spent catalyst C is taken out through the discharge device; the retort gas J generated by continuous retort, Enter the dedusting devic...

Embodiment 2

[0025] According to the method described in embodiment 1, the discarded catalyst of petroleum industry hydrorefining is processed:

[0026] 1. Pretreatment: Sieve out the inert ceramic balls mixed in the spent catalyst to obtain spent catalyst B smaller than 20×20mm.

[0027] 2. Dry distillation: send spent catalyst B to dry distillation equipment, and conduct continuous dry distillation at 550°C for 1.5 hours to obtain spent catalyst C with a weight loss of less than 2% at 500°C after dehydration, deoiling and desulfurization; The entrained waste catalyst powder is recovered and returned to the dry distillation equipment for further processing. The dry distillation gas after dust removal is cooled and recovered by heat exchange of high boiling point oil, water vapor and sulfur mixture, and the mixture is separated from oil and water to obtain crude oil, sulfur and oily wastewater; heat exchange After the dry distillation gas is filtered, it becomes a clean flammable low-boili...

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Abstract

The present invention belongs to the field of environment protection and resource utilization ,and is especially waste catalyst processing method. The waste catalyst processing process includes pre-treatment; dry distillation at temperature 400-800 deg.c for 1-2.5 hr to obtain dewatered, deoiled and desulfurized water catalyst white recovering dried gas; mixing waste catalyst with flux, trapping agent and reductant to obtain mixed material; high temperature smelting at 1500-1900 deg.c to convert into melt and smelted tail gas and treated for reuse. The present invention is one environment protecting process producing no secondary pollutant while recovering the components in waste catalyst, has metal recovering rate as high as 93 % and full utilization of waste catalyst resource.

Description

(1) Technical field [0001] The invention belongs to the field of comprehensive utilization of environmental protection and resource recovery, in particular to a method for harmless treatment of waste catalysts and recovery of oil, metal alloys, high-temperature slag and sulfur. (2) Background technology [0002] There are many kinds of spent catalysts, and the spent catalysts treated by the present invention include various hydrodesulfurization, hydrodenitrogenation, hydrodeheavy metal removal, hydrofining, hydrocracking, hydrodearomatization, selective Spent catalysts produced in permanent hydrocracking, catalytic reforming and other processes and desulfurization catalysts discarded in the ammonia synthesis industry, namely molybdenum-cobalt-alumina system, molybdenum-nickel-alumina system, molybdenum-cobalt-nickel-alumina system catalyst , Heavy metals such as vanadium, nickel, iron, and carbon are deposited on the spent catalyst. The vanadium, nickel, iron, etc. deposite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
Inventor 董金庆刘瑞广梁昌雄袁善琪
Owner DALIAN DONGTAI INDAL WASTE TREATMENT
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