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

Method for recycling hazardous waste acid by utilizing reaction heat

A reaction heat and resource utilization technology, applied in chemical instruments and methods, titanium oxide/hydroxide, inorganic chemistry, etc., can solve the problems of waste of resources, environmental pollution, high heat, etc., and achieve the effect of reducing energy consumption and cost

Active Publication Date: 2019-11-08
山东济清科技服务有限公司
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hazardous waste acid involved in the present invention contains about 25-32% hydrochloric acid, 5-10% titanium dioxide (TiO 2 ), 6-10% titanium tetrachloride (TiCl 4 ), 5-12% alcohols, 4-8% alkanes and other organic substances and a small amount of inorganic substances such as sodium sulfate and magnesium chloride, about 23% water, pH=(-2)-3, conductivity greater than or equal to 100000μs / cm, CODcr is 60000-70000mg / L, no heavy metals, but the composition is complex; if it is discharged without effective treatment, it will cause serious pollution to the environment and waste resources
[0003] Most of the existing treatment methods for the above-mentioned hazardous waste acid are directly neutralized with alkali, and then discharged; If the organic matter in the waste acid is not treated in any way, it will cause serious pollution to the environment after being discharged; and the components in the hazardous waste acid cannot be effectively used, resulting in a serious waste of resources
In addition, some methods use distillation or evaporation to further extract the beneficial components in the hazardous waste acid and further purify the sewage, but the heat required is high and the energy consumption is too high

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
  • Method for recycling hazardous waste acid by utilizing reaction heat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for recycling the above-mentioned hazardous waste acid by utilizing reaction heat, comprising the steps of:

[0036] Put hazardous chemical waste acid into the regulating tank, add 56kg of quicklime and 10kg of water into the digestion tank to obtain calcium hydroxide suspension; the obtained calcium hydroxide suspension is immediately passed into 2# reaction heat exchanger, and slowly passed into the hazardous chemical waste under stirring acid, carry out acid-base neutralization reaction for 40 minutes, and control the pH of the reaction solution obtained after the neutralization reaction to be 6; then pump it into a plate and frame filter press and filter to obtain TiO 2 And filtrate, 2# reaction heat exchanger recovers the heat generated in the reaction process at the same time. TiO 2 Washing and drying to obtain refined TiO 2 Product; the filtrate is evaporated by a thin-film evaporator, and the vacuum pump and water leg tube are evacuated in the thin-fi...

Embodiment 2

[0043] A method for recycling the above-mentioned hazardous waste acid by utilizing reaction heat, comprising the steps of:

[0044] Put the hazardous chemical waste acid into the regulating tank, add 60kg of quicklime and 10kg of water into the digestion tank to obtain a calcium hydroxide suspension; the obtained calcium hydroxide suspension is immediately passed into the 2# reaction heat exchanger, and slowly passed into the hazardous chemical waste under stirring acid, carry out acid-base neutralization reaction for 60 minutes, and control the pH of the reaction solution obtained after the neutralization reaction to be 6; then pump it into a plate and frame filter press and filter to obtain TiO 2 And filtrate, 2# reaction heat exchanger recovers the heat generated in the reaction process at the same time. TiO 2 Washing and drying to obtain refined TiO 2 Product; the filtrate is evaporated by a thin-film evaporator, and the vacuum pump and the water leg tube are evacuated ...

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
Conductivityaaaaaaaaaa
Conductivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a method for recycling hazardous waste acid by utilizing reaction heat. Accord to that invention, heat energy provided by process reaction heat is utilized for recycling the hazardous waste acid, TiO2 in the hazardous waste acid and salt substances generate in the treatment process can be effectively separated, and obtained standard discharge water has trace salt content, CODcr is reduced to 100 mg / L or less, chroma is reduced to 10 or less, and a main component is water; at the same time, the heat generated in the technological process is effectively recovered, and canbe used as the only heat source of a thin film evaporator and a spray dryer after being slightly heated, and the effective utilization of the heat generated in the technological process and reducing of the energy consumption can be realized. Compared with the energy consumption without recovering heat (namely heat sources of the thin film evaporator and the spray dryer are traditional heat sources), the energy consumption is reduced by 60%, and the cost is greatly saved.

Description

technical field [0001] The invention relates to a resource recycling method for hazardous waste acid by utilizing reaction heat, and belongs to the technical field of waste acid treatment. Background technique [0002] Hazardous waste acid, code-named HW34 900-349-34, is invalid, deteriorated, unqualified, eliminated, fake and inferior strong acid scrubbing powder, cleaning agent, stain remover and Other waste acid liquid and acid residue. The hazardous waste acid involved in the present invention contains about 25-32% hydrochloric acid, 5-10% titanium dioxide (TiO 2 ), 6-10% titanium tetrachloride (TiCl 4 ), 5-12% alcohols, 4-8% alkanes and other organic substances and a small amount of inorganic substances such as sodium sulfate and magnesium chloride, about 23% water, pH=(-2)-3, conductivity greater than or equal to 100000μs / cm, CODcr is 60000-70000mg / L, no heavy metals, but the composition is complex; if it is discharged without effective treatment, it will cause ser...

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
IPC IPC(8): C02F9/10C01G23/047
CPCC02F9/00C01G23/047C01G23/0475C02F1/66C02F1/048C02F1/78C02F1/12C02F1/20C02F1/001C02F1/08C02F2301/08Y02P20/10
Inventor 王正顺姜在勇王源
Owner 山东济清科技服务有限公司