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A kind of sulfuric acid method titanium dioxide production method and cleaning method of the membrane equipment

A production method and technology for titanium dioxide, applied in chemical instruments and methods, membrane technology, titanium compounds, etc., can solve the problems of cumbersome operation, complicated process, long time consumption, etc., and achieve the effect of wide selection and simplified cleaning operation.

Active Publication Date: 2022-03-08
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] The non-stop chemical washing method is adopted: under the condition that the equipment is not shut down and the relevant operating parameters are not adjusted in any way, the alkaline oxidation is added to the circulation tank of the system by direct pumping, manual feeding, gravity self-flow in high-level tank, etc. The cleaning agent (composition is 3% hydrogen peroxide, 5% sulfuric acid, 1% EDTA and the rest is water), the added amount (volume) is about 1% of the total volume of the membrane equipment, after 5min, the clear liquid flow rate returns to 1.52m 3 / h.

experiment example 2

[0053] The non-stop chemical washing method is adopted, and the alkaline oxidizing cleaning agent (20% sodium hypochlorite, 3% sodium hydroxide, 5% sodium phosphate, 5% sodium dodecylbenzene sulfonate, and others) is directly pumped into the circulating tank of the system. water), the added 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 washing 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 circulating tank of the system, and the added amount (volume) is the membrane equipment. About 1‰ of the total volume, without any adjustment to the relevant operating parameters, after 30min, the clear liquid flow will return to 1.50m 3 / h.

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PUM

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Abstract

The invention discloses a sulfuric acid method titanium dioxide production method and a method for cleaning membrane equipment in the water washing process. Perform online cleaning. The introduction of this cleaning method in the production of titanium dioxide can greatly simplify the cleaning process and significantly improve the utilization rate of membrane equipment without affecting the quality of recovered titanium dioxide products, and reduce the generation of waste water, thus significantly improving the production efficiency of titanium dioxide and reducing cost.

Description

technical field [0001] The invention relates to a method for producing titanium dioxide by a sulfuric acid method, 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 production process of titanium dioxide by sulfuric acid method usually includes raw ore crushing, acid hydrolysis, sedimentation, thermal 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-processing process. Coating is also known as surface treatment. The use of different coating agents can give titanium dioxide products different surface properties, improve the application performance indicators of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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