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Sulfuric-acid-method titanium dioxide production method and cleaning method for membrane equipment in sulfuric-acid-method titanium dioxide production method

A production method and technology of titanium dioxide, applied in the direction of chemical instruments and methods, membrane technology, titanium compounds, etc., can solve problems such as cumbersome operations, system failure to produce, and reduced utilization of processing equipment, and achieve the effect of simplifying cleaning operations

Active Publication Date: 2020-02-21
SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The traditional chemical cleaning method has complex process, cumbersome operation, long time-consuming (6-12 hours in the whole process), large consumption of chemicals, will generate additional waste water to be treated, and requires system shutdown, during the period of chemical cleaning, the system cannot produce , resulting in reduced utilization of processing equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0051] Non-stop chemical cleaning method: In the case of keeping the equipment without stopping and making any adjustments to the relevant operating parameters, add alkaline oxidation to the circulation tank of the system through direct pumping, manual adding, and high-level tank gravity self-flowing methods. Non-toxic cleaning agent (composed of 3% hydrogen peroxide, 5% sulfuric acid, 1% EDTA and the rest is water), the amount (volume) added is about 1% of the total volume of the membrane equipment, and after 5min, the clear liquid flow rate returns to 1.52m 3 / h.

experiment example 2

[0053] The non-stop chemical cleaning method is adopted, and the alkaline oxidizing cleaning agent (20% sodium hypochlorite, 3% sodium hydroxide, 5% sodium phosphate, 5% sodium dodecylbenzenesulfonate, and other is water), the addition amount (volume) is about 4‰ of the total volume of the membrane equipment, and the relevant operating parameters are not adjusted. After 10 minutes, the clear liquid flow rate returns to 1.51m 3 / h.

experiment example 3

[0055] The non-stop chemical cleaning method is adopted, and the alkaline oxidizing cleaning agent (composed of 5% hydrogen peroxide, 5% sulfuric acid, 0.5% EDTA, and the rest is water) is directly pumped into the circulation tank of the system, and the addition amount (volume) is The total volume is about 1‰, and the relevant operating parameters are not adjusted. After 30 minutes, the clear liquid flow rate returns to 1.50m 3 / h.

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Abstract

The invention discloses a sulfuric-acid-method titanium dioxide production method and a cleaning method for membrane equipment in a water washing procedure of the sulfuric-acid-method titanium dioxideproduction method. The cleaning method is characterized in that a cleaning agent is added for online cleaning of a membrane on the basis of keeping an unchanged working state of the membrane equipment in a water treatment procedure. By introduction of the cleaning method into titanium dioxide production, and on the premise of no influence on the quality of a recovered titanium dioxide product, acleaning process can be greatly simplified; the utilization rate of the membrane equipment can be significantly improved; generation of wastewater can be reduced; thus, titanium dioxide production efficiency can be significantly improved, and cost can be reduced.

Description

technical field [0001] The invention relates to a production method of sulfuric acid titanium dioxide, in particular to a water washing method and a method for cleaning membrane equipment used in the water washing. Background technique [0002] In the prior art, the sulfuric acid titanium dioxide production process usually includes raw ore crushing, acid hydrolysis, sedimentation, hot filtration, crystallization, ferrous separation, concentration, hydrolysis, primary washing, bleaching, secondary washing, salt treatment, calcination, intermediate crushing , coating, three washing, drying, crushing, packaging and other processes. [0003] In the production process of titanium dioxide, the coating process is the core part of the post-treatment process. Coating is also called surface treatment. Using different coating agents can give titanium dioxide products different surface properties, improve the application performance index of titanium dioxide, and make it have excellent...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D65/06C02F1/44C01G23/053C01G23/08
CPCB01D65/02C02F1/444C01G23/0532C01G23/08B01D2321/16B01D2321/168B01D2321/164B01D2321/162C02F2303/14
Inventor 杨积志单祥雷
Owner SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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