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Method for comprehensively utilizing waste hydrochloric acid produced in chlorination eluting tail gas process in chlorination method titanium white production

A titanium dioxide, chlorination technology, applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, calcium/strontium/barium chloride, etc. Waste and other problems, to achieve the effect of reuse, reduce production costs, and reduce load

Inactive Publication Date: 2013-12-11
LUOHE XINGMAO TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method ensures pollution-free discharge of waste water and waste gas and reduces environmental pollution, the neutralization process of acid waste water increases the supporting treatment capacity of subsequent sewage treatment stations, and at the same time reduces the utilization efficiency of resources, resulting in a huge waste of resources. waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Will Chloride titanium dioxide The tail gas generated during the production process is directly passed into the water washing tower, and the tail gas mainly contains CO 2 , HCl, TiCl 4 、SiCl 4 , chlorine, etc., high temperature TiCl in a washing tower 4 、SiCl 4 When encountering water, a hydrolysis reaction occurs to generate HCl gas. The original HCl gas in the tail gas and the HCl gas generated by hydrolysis are absorbed by water together to generate waste hydrochloric acid with a concentration of about 25%, while TiCl 4 、SiCl 4 TiO produced by hydrolysis 2 , SiO 2 Simultaneously precipitated in spent hydrochloric acid; CO not absorbed by water 2 , chlorine, etc. are passed into the alkali washing tower to react and be treated, and then discharged through the chimney. Filter waste hydrochloric acid for the first time to obtain primary filtrate and primary filter residue; add lime water to the primary filtrate to adjust the pH value of waste hydrochloric acid ...

Embodiment 2

[0017] Will Chloride titanium dioxide The tail gas generated during the production process is directly passed into the water washing tower, and the tail gas mainly contains CO 2 , HCl, TiCl 4 、SiCl 4 , chlorine, etc., high temperature TiCl in a washing tower 4 、SiCl 4 When encountering water, a hydrolysis reaction occurs to generate HCl gas. The original HCl gas in the tail gas and the HCl gas generated by hydrolysis are absorbed by water together to generate waste hydrochloric acid with a concentration of about 25%, while TiCl 4 、SiCl 4 TiO produced by hydrolysis 2 , SiO 2 Simultaneously precipitated in spent hydrochloric acid; CO not absorbed by water 2 , chlorine, etc. are passed into the alkali washing tower to react and be treated, and then discharged through the chimney. Filter waste hydrochloric acid for the first time to obtain primary filtrate and primary filter residue; add lime water to the primary filtrate to adjust the pH value of waste hydrochloric acid ...

Embodiment 3

[0019] The tail gas produced in the production process of chlorination titanium dioxide is directly passed into the water washing tower, and the tail gas mainly contains CO 2 , HCl, TiCl 4 、SiCl 4 , chlorine, etc., high temperature TiCl in a washing tower 4 、SiCl 4 When encountering water, a hydrolysis reaction occurs to generate HCl gas. The original HCl gas in the tail gas and the HCl gas generated by hydrolysis are absorbed by water together to generate waste hydrochloric acid with a concentration of about 25%, while TiCl 4 、SiCl 4 TiO produced by hydrolysis 2 , SiO 2 Simultaneously precipitated in spent hydrochloric acid; CO not absorbed by water 2 , chlorine, etc. are passed into the alkali washing tower to react and be treated, and then discharged through the chimney. Filter waste hydrochloric acid for the first time to obtain primary filtrate and primary filter residue; add lime water to the primary filtrate to adjust the pH value of waste hydrochloric acid to 2....

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PUM

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Abstract

The invention discloses a method for comprehensively utilizing waste hydrochloric acid produced in a chlorination eluting tail gas process in chlorination method titanium white production, which comprises the following steps: directly passing acidic tail gas produced in a chlorination method production process through a water washing tower, passing the tail gas subjected to water washing through an alkali washing tower, and then performing up-to-standard discharge; filtering the acidic waste water produced in the water washing process, and precipitating the insoluble substance for recycling; adding an alkaline substance into the filtered solution, regulating the pH value, ensuring that the substance in the solution is hydrolyzed to generate an insoluble substance, then filtering the solution, and recycling the filter residue; performing evaporating concentration on the filtrate to obtain a byproduct chloride; and condensing vapor produced in the evaporation process to obtain high-purity hydrochloric acid. Through treatment and recycling of tail gas eluting wastewater, the discharge amount of the wastewater is reduced, the environmental pollution is decreased, and a large amount of byproducts can be recovered, thus improving the resource utilization efficiency.

Description

technical field [0001] The invention relates to a waste water treatment and raw material recovery and utilization method in the production process of chlorination titanium dioxide, in particular to a method for comprehensive utilization of waste hydrochloric acid produced in the process of chlorination and leaching tail gas in the production of chlorination titanium dioxide. Background technique [0002] The chlorination and refining process in the production process of chlorination titanium dioxide contains CO 2 , HCl, TiCl 4 、SiCl 4 , chlorine and other waste gas, the waste gas is washed with water and alkali, which can not only wash the acid gas in the waste gas to generate waste hydrochloric acid, but also treat the chlorine gas in the tail gas by alkali washing, but due to the complex composition of the tail gas, SiCl in the waste gas 4 、TiCl 4 Hydrolysis produces insoluble silica and titanium dioxide, resulting in waste hydrochloric acid that cannot be directly used...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B7/07C01F11/24
Inventor 张兵兵李俊峰柳少军王亚锋陈焕芝张军超朱学红黄小九李茂恩
Owner LUOHE XINGMAO TITANIUM IND
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