Expansion graphite waste water treatment method

A technology for expanded graphite and wastewater treatment, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage treatment equipment, etc. Deal with the problems of high cost and achieve the effect of avoiding secondary pollution, improving production efficiency and improving recycling efficiency

Inactive Publication Date: 2018-05-18
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a treatment method for expanded graphite wastewater to solve the problem that the traditional treatment of expanded graphite wastewater has poor effects on metal ions and sulfate ions, high treatment costs, and difficulty in meeting the "Comprehensive Wastewater Discharge Standard" Technical Issues of the Secondary Emission Standard

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  • Expansion graphite waste water treatment method

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Effect test

Embodiment 1

[0037] A method for treating expanded graphite waste water, comprising the following steps:

[0038] (1) Expanded graphite waste water enters the primary sedimentation tank, after a period of static sedimentation, the hydraulic retention time is 1h, most of the expanded graphite powder settles to the bottom of the tank through natural precipitation, and the expanded graphite powder is collected at the bottom of the tank at a fixed time every day for recycling , The recovery rate of expanded graphite powder can reach 98.6%.

[0039](2) the waste water that step (1) is processed is sent into the manganese treatment recovery pond, adds calcium peroxide 1.8g / L, produces manganese precipitate, i.e. brown hydrated manganese dioxide precipitation, after the static settling of 0.5h, The hydrated manganese dioxide at the bottom of the pond is regularly recovered every day, and the recovery rate of metal manganese reaches 94.5%. At this time, the waste water changes from acidic to alkal...

Embodiment 2

[0043] A method for treating expanded graphite waste water, comprising the following steps:

[0044] (1) Expanded graphite waste water enters the primary sedimentation tank, after a period of static sedimentation, the hydraulic retention time is 2h, most of the expanded graphite powder settles to the bottom of the tank through natural precipitation, and the expanded graphite powder is collected at the bottom of the tank at a fixed time every day for recycling , The recovery rate of expanded graphite powder can reach 99.1%.

[0045] (2) Send the waste water treated in step (1) into the manganese treatment recovery pool, add calcium peroxide 2.0g / L, produce manganese precipitate, that is, brown hydrated manganese dioxide, after 1h of static precipitation, regularly The hydrated manganese dioxide at the bottom of the recovery pond, the metal manganese recovery rate reaches 96.3%, at this time, the waste water changes from the original acidity to the alkaline waste water, and the ...

Embodiment 3

[0049] A method for treating expanded graphite waste water, comprising the following steps:

[0050] (1) Expanded graphite wastewater enters the primary sedimentation tank, after a period of static sedimentation, the hydraulic retention time is 3h, most of the expanded graphite powder settles to the bottom of the tank through natural precipitation, and the expanded graphite powder is collected at the bottom of the tank at a fixed time every day for recycling , The recovery rate of expanded graphite powder can reach 99.7%.

[0051] (2) The waste water treated in step (1) is sent to the manganese treatment recovery pool, and calcium peroxide 2.2g / L is added to produce manganese deposits, i.e. brown hydrated manganese dioxide. After 1.5h of static precipitation, every day The hydrated manganese dioxide at the bottom of the tank is regularly recovered, and the metal manganese recovery rate reaches 97.8%. At this time, the waste water changes from the original acidity to the alkali...

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Abstract

The invention discloses an expansion graphite waste water treatment method. Waste water passes through a primary settling tank, a manganese treatment recovery pool, a calcium sulphate generating pooland a pH value regulating pool; then, outlet water is cyclically utilized. For the expansion graphite waste water treated by the method, the pH value is 7 to 8; the SS is less than 70mg / L; the Mn<2+>is less than 2mg / L; the first-grade discharge standard of the Sewage Integral Discharge Standard can be reached; the treated waste water can be cyclically utilized. By using the technical scheme, theexpansion graphite production waste water is firstly pretreated and is then subjected to reuse treatment, so that the treated final waste water reaches the requirements of reuse water and can be totally and cyclically utilized; the reutilization of water resources can be realized. By using the method, the waste water treatment effect is good; the technical flow process is simple and short; the required equipment investment is low; the occupied ground is small; the use of an additional chemical neutralization agent is not needed; the operation cost is low; the operation and control are easy; nowaste materials and waste water are generated; all materials re recovered and utilized; the energy-saving and environment-friendly effects are achieved; the economic benefits and environment benefitsare high.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a treatment method for expanded graphite waste water. Background technique [0002] Graphite is a non-metallic mineral raw material widely distributed in the world, and is rich in resources. Because of its many special properties, it is widely used in metallurgy, machinery, chemical industry, aerospace and nuclear industry and other fields. With the continuous development of graphite processing technology and the continuous development of various deep-processing products of graphite, graphite has become one of the more and more indispensable raw materials in various industrial sectors and high-tech fields. Expanded graphite is an intermediate product in the manufacture of flexible graphite, which is made from natural flake graphite through chemical or electrochemical intercalation treatment, water washing, drying, and high-temperature expansion. The expande...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01F11/46C01G45/02C01B32/215C02F101/20
CPCC01F11/46C01G45/02C02F1/52C02F1/58C02F1/64C02F1/66C02F1/722C02F9/00C02F2101/101C02F2101/206C02F2201/002
Inventor 李立欣宋志伟战友
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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