CN101973530A

CN101973530A - Method for treating waste titanium dioxide acid

Info

Publication number: CN101973530A
Application number: CN 201010511576
Authority: CN
Inventors: 杨民乐; 陈建立; 陈彦君; 赵波
Original assignee: HENAN BAILILIAN CHEMICAL CO Ltd
Current assignee: HENAN BAILILIAN CHEMICAL CO Ltd
Priority date: 2010-10-19
Filing date: 2010-10-19
Publication date: 2011-02-16

Abstract

The invention discloses a method for treating waste titanium dioxide acid, comprising the following steps of: (1) carrying out precipitation pretreatment on waste titanium dioxide acid, and separating and recycling solid titanium; and (2) mixing a solution obtained in the step (1) with concentrated sulfuric acid or fuming acid according to a mass ratio of 1:0.7-2, and curing; and carrying out solid-liquid separation to obtain 58-69% sulfuric acid and a ferrous sulfate crystal. The invention has the advantages that the process is simple, equipment investment is less, no external heat source is needed, equipment maintenance is simple, the production can be carried out continuously and cannot be shut down due to equipment blockage, the concentration of acid can reach about 65%, the impurities are less and the application range is wider.

Description

A kind of treatment process of titanium white waste acid

Technical field

The present invention relates to the treatment technology of the useless by product dilute sulphuric acid of titanium dioxide, be specifically related to a kind of treatment process of titanium white waste acid.

Background technology

Data shows that Production By Sulfuric Acid Process titanium white per ton will discharge 8 ~ 10 tons of dilute sulphuric acids (being the titanium hydrolysis mother liquor), generally contains H ₂SO ₄About 20%, also contain Fe ²⁺About 4% and a small amount of other soluble sulphate impurity.This diluted acid can partially recycled aborning utilization, for example when acidolysis as dilution water, as the part of reaction acid, reduce the consumption of the vitriol oil; Or it is stable in order to adjusting titanium liquid F value and raising when the acidolysis solid formation leaches.But the amount of these reuses is limited, and a large amount of spent acid also need be by handling or utilizing.

At present, the method for processing both at home and abroad or utilization has: 1. acid washing rolled steel rust cleaning; 2. with the spent acid evaporation and concentrating, reach back use more than 60%; 3. with ammoniacal liquor neutralization becoming liquid fertilizer sulphur ammonium; 4, with in lime or the calcium carbide mud and produce gypsum; 5, make artificial rutile etc.

In the aforesaid method, method 1 and method 5 spent acid consumptions are limited; Method 2 steam concentrating waste acid equipment requirements height, investment is big, running cost higher (400 ~ 500 yuan/ton), equipment stops up easily, and system's driving rate is lower; The not easy to store and transportation of method 3 products, market capacity is limited, is difficult to scale operation; The gypsum enormous amount that method 4 is produced is utilized and is subjected to region limits, is easy to cause secondary pollution.

Summary of the invention

The objective of the invention is to overcome above-mentioned shortcoming of the prior art, a kind of treatment process of with low cost, the simple titanium white waste acid of technology is provided.

For realizing goal of the invention, the technical solution used in the present invention is as follows:

The treatment process of titanium white waste acid of the present invention is as follows: spent acid is precipitated pre-treatment, separate and the solid shape titanium of recovery; The dilute sulphuric acid that above-mentioned steps is obtained and the vitriol oil are by mixed, the slaking of mass ratio 1:0.7 ~ 1.3; Carry out solid-liquid separation and can obtain 58 ~ 69% sulfuric acid and ferrous sulfate crystal.

Be specially: spent acid is precipitated pre-treatment, separate and the solid shape titanium of recovery; To directly press 1:0.7 ~ 1.3 mixed with 92 ~ 98% vitriol oils through 18% ~ 25% dilute sulphuric acid that above-mentioned steps obtains, the rejected heat that utilizes concentrated acid is with the Fe SO in the spent acid ₄.7H ₂The O dehydration is Fe SO ₄.H ₂O wash rice from liquid comes out, and slaking was carried out solid-liquid separation and can be obtained 58 ~ 69% sulfuric acid and ferrous sulfate crystal after 1 ~ 1.5 hour.

The inventive method is utilized the heat of dilution of the vitriol oil, and it is ferrous to make iron vitriol be transformed into a sl. sol. water, and realize the purifying of dilute sulphuric acid and carry densely, be that a kind of with low cost, technology is simply put forward method dense, simultaneously efficient deironing with the useless diluted acid of titanium white.

The method of the useless direct processing and utilizing of diluted acid of the present invention and other titanium whites and steam concentrate to be put forward dense method and compare and have following advantage: (1) technology is simple, and facility investment is few; (2) need not extraneous thermal source; (3) produce and to carry out continuously, can not stop because equipment stops up; (4) maintenance of the equipment is simple; (5) dense the reaching about 65% of acid, impurity is few, and purposes is wider.

Embodiment

Embodiment 1

Get 80ml and contain H ₂SO ₄22.30% spent acid is poured in the 250ml beaker, measures 100ml and contains H ₂SO ₄98% sulfuric acid is poured in the above-mentioned beaker while stirring, and the back continuation of having fallen was stirred 5 minutes, and static 1 hour, suction filtration obtained 68%H ₂SO ₄150ml.

Embodiment 2

Get 90ml and contain H ₂SO ₄22.30% spent acid is poured in the 250ml beaker, measures 100ml and contains H ₂SO ₄98% sulfuric acid is poured in the above-mentioned beaker while stirring, and the back continuation of having fallen was stirred 5 minutes, and static 1 hour, suction filtration obtained 68.5%H ₂SO ₄140ml.

Embodiment 3

Get 100ml and contain H ₂SO ₄22.30% spent acid is poured in the 250ml beaker, measures 100ml and contains H ₂SO ₄98% sulfuric acid is poured in the above-mentioned beaker while stirring, and the back continuation of having fallen was stirred 5 minutes, and static 1 hour, suction filtration obtained 69.0%H ₂SO ₄138ml.

Embodiment 4

Get 110ml and contain H ₂SO ₄22.30% spent acid is poured in the 250ml beaker, measures 100ml and contains H ₂SO ₄98% sulfuric acid is poured in the above-mentioned beaker while stirring, and the back continuation of having fallen was stirred 5 minutes, and static 1 hour, suction filtration obtained 69.02%H ₂SO ₄143ml.

Embodiment 5

Get 120ml and contain H ₂SO ₄22.30% spent acid is poured in the 250ml beaker, measures 100ml and contains H ₂SO ₄98% sulfuric acid is poured in the above-mentioned beaker while stirring, and the back continuation of having fallen was stirred 5 minutes, and static 1 hour, suction filtration obtained 69.5%H ₂SO ₄145ml.

Claims

1. the treatment process of a titanium white waste acid is characterized in that, it comprises the steps:

(1) titanium white waste acid is precipitated pre-treatment, separate and the recovery solid titanium;

(2) solution that step (1) is obtained and the vitriol oil or fuming acid are mixed, the slaking of 1:0.7 ~ 2 by mass ratio; Carry out solid-liquid separation and can obtain 58 ~ 69% sulfuric acid and ferrous sulfate crystal.

2. the treatment process of titanium white waste acid according to claim 1, it is characterized in that: the concentration of the described vitriol oil is 92 ~ 98%.

3. the treatment process of titanium white waste acid according to claim 1 and 2, it is characterized in that: the described curing time is 0.5 ~ 1.5 hour.