Unlock instant, AI-driven research and patent intelligence for your innovation.

Resource method of deposed salt slag or heavy metal sewage sludge and its private facilities

A technology of heavy metal sludge and special equipment, which is applied in the direction of pyrolysis treatment of sludge and solid waste removal, etc., can solve problems such as secondary pollution, difficult to deal with, and affect human health, so as to reduce environmental hazards and protect the environment Effect

Inactive Publication Date: 2009-11-11
NANJING UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] A lot of waste salt residues are often produced in modern chemical production, such as sodium sulfate, sodium chloride, potassium chloride, etc. These waste salt residues are often entrained with various toxic organic substances, such as chlorobenzenes, nitrobenzenes, anilines, phenols, etc. Ketones, ketones, etc. are difficult to handle. If they are used without purification, they will cause serious secondary pollution and even affect human health.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Resource method of deposed salt slag or heavy metal sewage sludge and its private facilities
  • Resource method of deposed salt slag or heavy metal sewage sludge and its private facilities

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A chemical plant produces 2,000 tons of sodium pyridinate annually, and produces about 660 tons of waste sodium chloride salt residue, which contains 69.8% sodium chloride, 12.9% addition products, 3% pyridone, and 4.2% nitrobenzene.

[0020] Use this process and equipment to process the above waste salt slag. Since the melting point of sodium chloride is 800.4°C, the boiling point of pyridone is 30°C, and the boiling point of nitrobenzene is 210-211°C, the temperature of the pyrolysis section is controlled to be 250°C. The entire residence time in the solution drum (9) is >10min. The organic matter in the waste salt slag is gasified and sent to the incinerator (5) in the high temperature section. The temperature in the high temperature section is >1100°C and the residence time is 6s. The organic matter is completely decomposed into carbon dioxide, and the incineration removal rate of the organic matter is >99.99%. The salt after pyrolyzing the organic matter is dissolv...

Embodiment 2

[0022] A chemical plant produces 1,000t of 1,5-naphthalenediol annually, and produces 5,634t of waste sodium sulfate slag, which contains 86.7% sodium sulfate, 1.2% naphthalenesulfonic acid, 1.3% sodium naphthalenesulfonate, and 0.8% naphthalenediol.

[0023] Use this process and equipment to treat the above waste salt slag. Since the conversion point of sodium sulfate is 500°C and the melting point of naphthalenesulfonic acid is 90°C (decomposition), sodium naphthalenesulfonate is easy to decompose, and naphthalene diol decomposes at 258°C. Control the pyrolysis section The temperature is 300°C, and the entire residence time in the pyrolysis drum is 5min. The organic matter in the waste salt slag is gasified and enters the high-temperature section. The temperature of the high-temperature section is 1100°C and the residence time is 2s. The organic matter is completely decomposed into carbon dioxide, and the incineration removal rate is >99.99%. The salt after pyrolyzing the or...

Embodiment 3

[0025] A chemical plant produces 3961 tons of waste potassium chloride salt slag annually, which contains 88% potassium chloride and 1.4% chlorobenzene.

[0026] Using this process and equipment to treat the above waste salt slag, since the melting point of potassium chloride is 776°C and the boiling point of chlorobenzene is 132°C, the temperature of the pyrolysis section is controlled to be 200°C, and the entire residence time in the pyrolysis drum is 6 minutes. Chlorobenzene, etc. are gasified and enter the high temperature section. The temperature of the high temperature section is 1100°C, and the residence time is 4s. Chlorobenzene, etc. are completely decomposed into carbon dioxide, and the incineration removal rate is >99.99%. The salt after pyrolysis of the organic matter is dissolved in water, filtered and recrystallized to obtain potassium chloride meeting the quality standard.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
boiling pointaaaaaaaaaa
boiling pointaaaaaaaaaa
Login to View More

Abstract

A method for recycling waste salt residue or heavy metal sludge, which is to heat the waste salt residue or heavy metal sludge at 200-500°C for pyrolysis, and the organic matter in the waste salt residue or heavy metal sludge is carbonized or gasified, and the gas The decomposed organic matter is then incinerated at a high temperature section at 1100-2000°C, completely decomposed into carbon dioxide, emptied, and the salt slag after the pyrolysis of the organic matter is dissolved in water and then recrystallized to obtain industrial salt that meets the quality standards; after heavy metal oxides are added with dilute acid Filter, concentrate and recrystallize to obtain heavy metal salts that meet the quality standards. By adopting the recycling method of waste salt slag or heavy metal sludge of the present invention, the incineration and removal rate of organic matter is greater than 99.99%. The method of the invention can not only protect the environment, reduce the harm of the waste residue to the environment, realize the reduction, harmlessness and resource utilization of the waste residue, but also obtain certain economic benefits.

Description

technical field [0001] The invention relates to the recycling of waste salt slag or heavy metal sludge. Background technique [0002] A lot of waste salt residues are often produced in modern chemical production, such as sodium sulfate, sodium chloride, potassium chloride, etc. These waste salt residues are often entrained with various toxic organic substances, such as chlorobenzenes, nitrobenzenes, anilines, phenols, etc. Ketones, ketones, etc. are difficult to deal with. If they are used without purification, they will cause serious secondary pollution and even affect human health. On the other hand, a large amount of heavy metal sludge is produced in the production of chemical industry, electroplating, metal surface treatment, etc., and many organic substances are entrained in it. How to effectively recover heavy metals in sludge is also an urgent problem to be solved. Contents of the invention [0003] The purpose of the present invention is to provide a method and sp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10F23G7/06B09B3/00
Inventor 赵玉明陈飞
Owner NANJING UNIV