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Integral management method for acid sewage generated in titanium white powder production process

A production process, acid sewage technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve problems such as waste, high hardness, secondary pollution, etc.

Active Publication Date: 2012-02-01
HANGZHOUREADY BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process can remove heavy metals such as part of iron and most of the suspended solids, the content of heavy metals such as iron, chromium, cadmium, lead and mercury in the discharge water is still very high (such as iron, still can be as high as 50-70ppm; chromium, still There are 30-40ppm; titanium 10-20ppm), and the hardness of the water is very high (up to 1500-3000ppm in terms of CaCO3); at the same time, a large amount of sludge is produced, for example, 300-400 kg of sludge can be produced for one ton of raw acid sewage (water content 40-70%), these solid wastes not only occupy a large number of sites, but also pollute the local groundwater for a long time, causing secondary pollution (such as the leakage of chromium, cadmium, lead, mercury to pollute the groundwater), which cannot reach the current level. emission standards
In addition, the discharge of a large amount of water without reuse is obviously a huge waste for China, which is so scarce in water resources. For example, for a titanium dioxide manufacturer with an output of 100,000 tons / year, the daily water consumption can reach 10,000 tons

Method used

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  • Integral management method for acid sewage generated in titanium white powder production process
  • Integral management method for acid sewage generated in titanium white powder production process
  • Integral management method for acid sewage generated in titanium white powder production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a comprehensive treatment method for acid sewage produced in the production process of titanium dioxide, which mainly includes the following steps:

[0044] Step 1: The acidic sewage is subjected to coarse filtration and microfiltration treatment processes for preliminary impurity removal.

[0045] In this step, first pass the acid sewage generated in the production process of titanium dioxide with a flow rate of 10,000 tons / day through a mechanical filter, use a mechanical filter or a bag filter with a filtration accuracy of 20.0 μm for mechanical filtration, and then use a microfiltration system for microfiltration. Filtration treatment, the microfiltration system is composed of four-stage (M=4) microfiltration separation membrane processes, such as Figure 4 shown, and adopts polypropylene microfiltration separation membrane (such as KJESUF9050X50 / 80) with a membrane pore of 0.5 μm (molecular weight cut-off 80,000), according to the treatment...

Embodiment 2

[0076] The difference between this embodiment and embodiment 1 is that step 6 is added after step 5: ferrite preparation process. This process combines the controllable aeration / oxidation co-precipitation method with the patent "a preparation method of ferrite nanoparticles" (CN201110102232.4) to prepare nano ferrite. The controllable aeration process is based on the content of divalent and ferric iron in the concentrated solution obtained in step 4, adopting air bubbling at the bottom of the container for storing the concentrated solution to oxidize part of the ferrous iron into ferric iron, so that the ferrous iron The molar ratio of iron and ferric iron satisfies the FeCl in step one in the patent 2 4H 2 O and FeCl 3 ·6H 2 The molar ratio of O, specifically the molar ratio of ferrous iron and ferric iron is preferably 1:2; then the mixed iron salt co-precipitation technology in patent CN201110102232.4 is used to prepare highly dispersed soluble nano-ferrite.

[0077] ...

Embodiment 3

[0080] The difference between this embodiment and Example 1 is that in step one, the flow rate is 10,000 tons / day through the mechanical filter, and then 6 stages of microfiltration separation membrane processes are used (the reflux ratio of each stage of microfiltration separation membrane process is 2: 1 ) The polysulfone microfiltration separation membrane connected in series at the outlet of the retentate treats the permeate through the mechanical filter, and the water fluxes of each microfiltration separation membrane process are 125 tons / hour, 83 tons / hour, and 56 tons / hour respectively , 37 tons / hour, 25 tons / hour and 16 tons / hour, the total reflux ratio still reaches 1:9. The microfiltration system can remove impurities such as suspended solids and partially dissolved solids in raw acid water, the total solid content is reduced from 150g / L to 30g / L, and the color of the filtrate also changes from milky white turbid to colorless and clear. Other indicators Still can rea...

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Abstract

The invention provides an integral management method for acid sewage generated in a titanium white powder production process, which concretely comprises the steps of an acid sewage primary impurity removal coarse filtering and micro filtering treatment work procedure, a multi-stage nanometer filtering treatment work procedure, a neutralization aeration and sedimentation process, a multi-stage nanometer filtering treatment work procedure, a utilization process of changing sludge into resources, and the like. The method can also comprise a ferrite preparation step. The integral management method for the acid sewage generated in the titanium white powder production process obtains the acid-containing water with various kinds of metal salt contents reaching the standard, the acid-containing water is reused for an ore acidolysis production system, 0.1 to 25 percent of sulfuric acid and / or hydrochloric acid is saved, reclaimed water which can not reach the standard is treated into a state reaching the standard, in addition, the water reaching the standard through the aeration, neutralization, sedimentation and nanometer filtering is used as the reclaimed water to be reused for differentproduction shops according to the need, a half of supplementing water is saved, the sludge generated by the traditional treatment system can be utilized through being changed into resources, places for storing the sludge are saved, and the caused secondary pollution is eliminated.

Description

technical field [0001] The invention belongs to the technical field of comprehensive treatment of industrial sewage and the application of nanomaterials, and specifically relates to a comprehensive treatment method for acid sewage produced in the production process of titanium dioxide, that is, a method using multi-stage microfiltration and nanofiltration separation membrane technology and flocculation precipitation A comprehensive treatment method that combines waste recycling technology and waste recycling technology. Background technique [0002] At present, the production of titanium dioxide mainly includes sulfuric acid method and chlorination method, both of which produce a large amount of sewage containing acid and metal salts. Be the waste sulfuric acid of 15-25% as every ton of titanium dioxide by-product ferrous sulfate 2.5-4.0 tons, mass concentration as every production, and the sewage (Huang Yongqiang, Wu Tao, Wu Chundu etc., Jiangsu University Journal (Nature) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C04B38/00C02F1/44C02F1/56
Inventor 宋玉军
Owner HANGZHOUREADY BIOLOGICAL TECH CO LTD
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