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A kind of process of resource recovery and utilization of titanium dioxide hydrochloric acid waste residue

A titanium dioxide and resource recovery technology, applied in the field of environmental engineering, can solve the problems of narrow range of auxiliary/flocculant and little effect, and achieve the effect of convenient procurement and configuration

Active Publication Date: 2018-01-02
GENERAL TREATMENT ENVIRONMENT BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid-liquid separation method is usually to modify the material by adding coagulant or flocculant to improve its sedimentation and filtration performance. little

Method used

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  • A kind of process of resource recovery and utilization of titanium dioxide hydrochloric acid waste residue
  • A kind of process of resource recovery and utilization of titanium dioxide hydrochloric acid waste residue
  • A kind of process of resource recovery and utilization of titanium dioxide hydrochloric acid waste residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The first part, the modification of compound filter aid to the filtration and deacidification performance of hydrochloric acid waste residue (small test of filter press).

[0052] The filter area is 0.16m 2 The 250-type chamber filter press was used to compare the deacidification effect of the modified hydrochloric acid waste residue. The specific test steps, methods and parameters are adjusted as follows:

[0053] Dissolving polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol successively in a glass-lined drug dissolution pool containing tap water in a mass ratio of 1:2:7 to obtain a strong acid-resistant composite filter aid with a mass concentration of 2%;

[0054] Pre-dissolved in hot water at 90-95°C to obtain a 2% volume concentration composite filter aid solution;

[0055] Take some DQ, BCE, N series catalyst hydrochloric acid waste residues, add composite filter aid according to 25% of its volume for conditioning, add slowly while stirring, continu...

Embodiment 2

[0069] The filter area is 0.16m 2 The 250-type chamber filter press was used to compare the deacidification effect of the modified hydrochloric acid waste residue. The specific test steps, methods and parameters are adjusted as follows:

[0070] Dissolving polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol successively in a glass-lined drug dissolution pool containing tap water in a mass ratio of 2:3:5 to obtain a strong acid-resistant composite filter aid with a mass concentration of 2%;

[0071] Pre-dissolved in hot water at 90-95°C to obtain a 2% mass concentration composite filter aid solution;

[0072] Take some DQ, BCE, N series catalyst hydrochloric acid waste residues, add composite filter aid according to 30% of its volume for conditioning, the reaction is carried out in the glass-lined conditioning tank, add slowly while stirring, continue stirring for 30 minutes after the addition is completed, so that The system is mixed evenly, and then the feed is ...

Embodiment 3

[0076] The filter area is 0.16m 2 The 250-type chamber filter press was used to compare the deacidification effect of the modified hydrochloric acid waste residue. The specific test steps, methods and parameters are adjusted as follows:

[0077] Dissolving polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol successively in a glass-lined drug dissolution pool containing tap water in a mass ratio of 11:19:42 to obtain a strong acid-resistant composite filter aid with a mass concentration of 2%;

[0078] Pre-dissolved in hot water at 90-95°C to obtain a 2% volume concentration composite filter aid solution;

[0079] Take some DQ, BCE, N catalyst hydrochloric acid waste residue, add composite filter aid according to 20% of its volume for conditioning, add slowly while stirring, continue stirring for 25 minutes after adding, make the system evenly mixed, and then use a filter press to filter Material deacidification;

[0080] Filter press operating parameters: The pr...

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Abstract

The invention provides a process for recycling titanium dioxide and hydrochloric acid waste residue resources. The process comprises the steps of compound filter aid preparation, hydrochloric acid waste residue modification, modified hydrochloric acid waste residue deacidification, titanium dioxide residue cake calcining, oil-containing hydrochloric acid distilling, hydrochloric acid and oil phase separation and residual still liquor secondary treatment. The preparation process of a compound filter aid comprises the steps that polyethylene glycol, polyvinylpyrrolidone and polyvinyl alcohol are sequentially dissolved in a glass lining agent dissolving pond containing tap water according to the mass proportion being 1:2:(7-2):3:5, and a strong-acid-resistant compound filter aid with the mass concentration being 2% is obtained. In the process, all the components of the compound filter aid are nonionic organic high-molecular compounds, no metal ion is contained, the addition amount of the compound filter aid is low, the compound filter aid only accounts for about 1.5% of hydrochloric acid waste reside dry matter and is basically decomposed after high-temperature calcining, the influence on the purity of recycled titanium dioxide is small, it is measured that the titanium dioxide content of the product obtained after high-temperature calcining ranges from 85% to 92%, and the product can serve as high-titanium slag.

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to a process for recycling titanium dioxide hydrochloric acid waste residue resources. Background technique [0002] Titanium dioxide is an important white inorganic pigment, mainly divided into titanium dioxide, widely used in coatings, rubber, ceramics, medicine, food and other industries. The traditional production process of titanium dioxide mainly includes sulfuric acid method and chlorination method. In addition, the American Ertel Nanomaterials Company also invented the hydrochloric acid method production process. The production of titanium dioxide in my country mainly adopts the sulfuric acid method. According to statistics, 0.2-0.3 tons of acidolysis waste residue is discharged without producing 1 ton of titanium dioxide. The content of titanium dioxide in these black waste residues is generally about 25%, which has the value of further recycling. At present, the comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 张卫华宋永伟
Owner GENERAL TREATMENT ENVIRONMENT BEIJING CO LTD
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