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Low-temperature chlorination tail gas comprehensive utilization method

A chlorinated tail gas and low temperature technology, applied in chemical instruments and methods, titanium compounds, chlorine/hydrogen chloride, etc., can solve the problems of underutilization of tail gas, increased environmental protection treatment costs, waste of useful resources, etc., to achieve environmental protection of tail gas treatment, Reduce comprehensive cost and realize the effect of comprehensive utilization of resources

Inactive Publication Date: 2019-12-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for comprehensive utilization of low-temperature chlorination tail gas in order to overcome the problems of insufficient utilization of tail gas in the low-temperature chlorination process in the prior art, resulting in waste of useful resources and increasing the cost of environmental protection treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] (a) Set the flow rate to 3677Nm 3 / h, flow velocity is that the low-temperature chlorination tail gas of 14m / s enters pickling 7s in the aqueous solution in the pickling tower, controls described low-temperature chlorination tail gas and the ratio of the volume of described aqueous solution to be 1:7, acid pickling finishes after pickling The solid content in the lotion was 2.2g / L, and then the pickling solution was sent to the filter tank for filtration for 35s to obtain a titanium-containing material with a concentration of 14.18% waste hydrochloric acid and a titanium dioxide content of 82.37%;

[0088] (b) Flow the waste hydrochloric acid gained in step (a) into the resin bed at a speed of 1.5m / s, and the flow rate is 2000m 3 / h The resin in the resin bed absorbs hydrochloric acid, and the remaining liquid is discharged into the metal salt recovery system. When the saturation of the resin absorbing hydrochloric acid reaches 100%, the resin bed stops working, and the...

Embodiment 2

[0091] (a) flow is 3677Nm / h, flow velocity is that the low-temperature chlorination tail gas of 10m / s enters pickling 7s in the aqueous solution in the pickling tower, and the volume ratio of control described low-temperature chlorination tail gas and described aqueous solution is 1: 7. After the pickling, the solid content in the pickling liquid is 2.2g / L, and then the pickling liquid is sent to the filter tank for filtration for 35s to obtain waste hydrochloric acid with a concentration of 14.18% and a titanium-containing material with a titanium dioxide content of 82.37%;

[0092] (b) Flow the waste hydrochloric acid gained in step (a) into the resin bed with a speed of 1m / s, and the flow rate is 2000m 3 / h The resin in the resin bed absorbs hydrochloric acid, and the remaining liquid is discharged into the metal salt recovery system. When the saturation of the resin absorbing hydrochloric acid reaches 100%, the resin bed stops working, and then the flow rate is 2000m 3 1...

Embodiment 3

[0095] (a) Set the flow rate to 3458Nm 3 / h, the low-temperature chlorination tail gas that the flow velocity is 8m / s enters the aqueous solution in the pickling tower for pickling 10s, controls the volume ratio of the low-temperature chlorination tail gas and the aqueous solution to be 1:10, pickling after pickling finishes The solid content in the lotion is 2g / L, and then the pickling solution is sent to the filter tank for 25s to filter to obtain a titanium-containing material with a concentration of 12.37% waste hydrochloric acid and a titanium dioxide content of 81.83%;

[0096] (b) Flow the waste hydrochloric acid gained in step (a) into the resin bed with a speed of 1m / s, and the flow rate is 1500m 3 / h The resin in the resin bed absorbs hydrochloric acid, and the remaining liquid is discharged into the metal salt recovery system. When the saturation of the resin absorbing hydrochloric acid reaches 95%, the resin bed stops working, and then the flow rate is 1500m 3 The...

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Abstract

The invention relates to the field of tail gas treatment, and discloses a method for comprehensively utilizing low-temperature chlorination tail gas. The method comprises the following steps: (a) sequentially acid-pickling and filtering the low-temperature chlorination tail gas to obtain a waste hydrochloric acid solution with the concentration of 10-20 wt% and solid particles; (b) concentrating the waste hydrochloric acid obtained in the step (a) to obtain a concentrated hydrochloric acid solution with the concentration of 22-28 wt%; and (c) leaching the titanium-containing material and the concentrated hydrochloric acid obtained in the step (b), and roasting the solid material to obtain the artificial rutile of which the TiO2 content is greater than 88 wt%. According to the method, wasteacid obtained after low-temperature chlorination tail gas treatment is used for leaching titanium-containing materials after the purification concentration is increased; the titanium-containing component in the titanium dioxide is enriched, the titanium resource enrichment efficiency is improved, the obtained artificial rutile can be used as a high-quality titanium-containing raw material for producing high-temperature chlorinated titanium dioxide, comprehensive utilization of resources is achieved, the comprehensive cost of tail gas treatment is reduced, environment-friendly treatment of tail gas is achieved, operation is easy, and the comprehensive cost of low-temperature chlorination production is reduced.

Description

technical field [0001] The invention relates to the field of tail gas treatment, in particular to a method for comprehensive utilization of low-temperature chlorination tail gas. Background technique [0002] The production methods of titanium dioxide include sulfuric acid method and chlorination method. With the implementation of the national environmental protection policy, the chlorination method of titanium dioxide has gradually become the mainstream process of domestic titanium dioxide production because of its environmental protection technology and excellent product quality. The chlorination method includes molten salt chlorination and boiling chlorination, and its raw materials are basically artificial rutile, high titanium slag, natural rutile and other TiO 2 Titanium-rich material with high content. The boiling chlorination process of titanium-rich materials is easy to block the slag outlet (temperature is 900-1100°C) due to the low melting point of calcium and ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07C01G23/053
CPCC01B7/0706C01G23/0536
Inventor 宋兵凌鹏李良王建鑫
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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