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Method and device for purifying bromine-extracting waste liquid

A purification device and waste liquid technology, which is applied in chemical instruments and methods, neutralized water/sewage treatment, water treatment parameter control, etc., can solve the problems of failure to meet the standard for normal reception of subsequent processes, high acidity of bromine extraction waste liquid, and environmental pollution and other problems, to achieve the effect of simple raw material acquisition, significant environmental protection benefits, and reduced acid corrosion

Pending Publication Date: 2018-09-14
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a process and device for adjusting the pH value of bromine extraction waste liquid by using waste salt mud. By adding waste salt mud to adjust the pH value of bromine extraction waste liquid, it solves the problem of high acidity, strong corrosion, etc. of bromine extraction waste liquid. Problems that pollute the environment, cannot be normally received by subsequent processes, or cannot meet the discharge standards

Method used

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  • Method and device for purifying bromine-extracting waste liquid
  • Method and device for purifying bromine-extracting waste liquid
  • Method and device for purifying bromine-extracting waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, the waste salt mud is obtained from the brine refining process produced by soda ash, and the contents of each component on a dry basis are:

[0035]

[0036] Refer to attached figure 1 , the waste salt mud 2 first enters the salt mud settling tank 3, discards the supernatant liquid 5 after layering, takes the lower layer suspension liquid 4, and sends it to the cyclone separator 7 through the salt mud delivery pump 6, and separates and removes the mud with a larger specific gravity. sand 8 to obtain the selected waste salt mud 9, the selected waste salt mud 9 is sent to the salt mud storage tank 10, and the salt mud storage tank 10 is equipped with stirring to ensure that the composition of the waste salt mud is uniform, and the bromine extraction waste liquid 1 is passed through the bromine extraction The waste liquid feeding control valve 12 enters the reaction tank 13, after the control valve 12, the selected waste salt mud is added, and the do...

Embodiment 2

[0041] In this example, the waste salt mud is obtained from the brine refining process of chlor-alkali production, and the content of each component on a dry basis (mass percentage):

[0042]

[0043] Refer to attached figure 1 , the waste salt mud 2 first enters the salt mud settling tank 3, discards the supernatant liquid 5 after layering, takes the lower layer suspension liquid 4, and sends it to the cyclone separator 7 through the salt mud delivery pump 6, and separates and removes the mud with a larger specific gravity. sand 8 to obtain the selected waste salt mud 9, the selected waste salt mud 9 is sent to the salt mud storage tank 10, and the salt mud storage tank 10 is equipped with stirring to ensure that the composition of the waste salt mud is uniform, and the bromine extraction waste liquid 1 is passed through the bromine extraction The waste liquid feed control valve 12 enters the reaction tank 13, and after the bromine extraction waste liquid feed control valv...

Embodiment 3

[0046] In this embodiment, the acidity, alkalinity and main components of the bromine extraction waste liquid from brine are shown in the table below, and the iron content reaches 1.9 ppm.

[0047]

[0048] The waste salt mud used is obtained from the NaCl brine refining process produced by MVR, and the contents of each component on a dry basis are:

[0049]

[0050] Refer to attached figure 1 , the waste salt mud 2 first enters the salt mud settling tank 3, discards the supernatant liquid 5 after layering, takes the lower layer suspension liquid 4, and sends it to the cyclone separator 7 through the salt mud delivery pump 6, and separates and removes the mud with a larger specific gravity. sand 8 to obtain the selected waste salt mud 9, the selected waste salt mud 9 is sent to the salt mud storage tank 10, and the salt mud storage tank 10 is equipped with stirring to ensure that the composition of the waste salt mud is uniform, and the bromine extraction waste liquid 1 ...

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Abstract

The invention discloses a method and a device for purifying bromine-extracting waste liquid. Waste salt sludge generated in the process of refining saline through a chemical process is selected and used for adjusting pH value of the bromine-extracting waste liquid, and turbidity of the bromine-extracting waste liquid is lowered through secondary coagulation process and air flotation process; the method and the device can be used for purifying high-acidity high-salinity bromine-extracting waste liquid, acid corrosiveness of the waste liquid is lowered remarkably, up-to-standard emission is realized, and no acidic pollution is caused to surrounding environment; various suspended matters can be removed effectively, the bromine-extracting waste liquid after being purified is quite clear, the turbidity is lowered remarkably, and 90% of ingredients like silicon and iron in the bromine-extracting waste liquid can be removed without changing original active composition in the same; through purifying treatment, quality of the bromine-extracting waste liquid is improved greatly, the method and the device can be directly used for salt drying in the sun, vacuum salt making and other process using saline, are low in purifying cost and simple in raw material obtaining way, realize treatment of waste by waste and have remarkable environment protection benefit.

Description

technical field [0001] The invention relates to a purification method and device for bromine extraction waste liquid, in particular to a treatment method and device for reducing the acidity and turbidity of bromine extraction waste liquid. Background technique [0002] Seawater and brine are important raw materials for extracting bromine. Generally, concentrated seawater is used to extract bromine from seawater. When the concentration of bromine in concentrated seawater reaches the extraction concentration, an appropriate method is selected for extraction. Bromine-containing brine is also one of the raw materials for bromine extraction. The underground brine resources in the south coast of Bohai Bay are rich in resources and high in bromine content. 4 times. Common processes for extracting bromine from seawater or brine include bromine blowing method, liquid membrane method, air blowing method, adsorbent method, aniline method and ion exchange resin method, among which bro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/08C02F103/34
CPCC02F9/00C02F2209/06C02F2103/34C02F2209/40C02F11/121C02F11/127C02F2103/08C02F1/24C02F1/5236C02F1/56C02F1/66
Inventor 刘建路王宗瑞张浩波郎丰国陈晓宇凌奇张涛迟庆峰
Owner CHINA NAT OFFSHORE OIL CORP
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