CN103558332B - Method for determining qualified stability index in titanium solutions with different concentrations - Google Patents

Abstract

The invention discloses a method for determining a qualified stability index in titanium solutions with different concentrations. The qualified stability index of the titanium solutions with the different concentrations is directly determined according to a following formula: Vx=Cx/C1 *V1, wherein Vx refers to the qualified stability index of a titanium solution to be tested, and the measurement unit of Vx refers to mL; Cx refers to a concentration of the titanium solution to be tested, and the measurement unit of Cx is g/L; C1 refers to a concentration of a qualified autogenic crystal seed titanium solution, and measurement unit of cl refers to g/L; V1 refers to a qualified stability index of the qualified autogenic crystal seed titanium solution, and the measurement unit of V1 refers to mL; wherein V1 is expressed by milliliter number of distilled water with the temperature of 25 DEG C which is consumed for diluting 1mL of the qualified autogenic crystal seed titanium solution with the concentration of c1 when a white turbid appears justly. According to the method, the problem of inaccurate stability judgment of an additional crystal seed titanium solution due to large stability difference of the autogenic crystal seed titanium solution and the additional crystal seed titanium solution can be solved, the problem that the detection stability of the additional crystal seed titanium solution is nominally judged to be unqualified and is actually judged to be qualified is solved, whether the stability of the titanium solution is qualified in different stations can be judged, and the stability of the titanium solutions with the different concentrations in each procedure can be strictly controlled.

Description

A kind of defining method of qualified stability index of variable concentrations titanium liquid

Technical field

The present invention relates to the technical field of Producing Titanium Dioxide, more particularly, relate to a kind of qualified stability Index of variable concentrations titanium liquid.

Background technology

Titanium liquid stability is an important indicator of titanium liquid.Titanium liquid is in storage process, have A-si seasoning effect and separate out the tendency of colloid gradually, in the titanium liquid of poor stability, itself some colloidal material has been created before hydrolysis, these colloids are present in titanium liquid, bad nucleus of crystal has been become when being hydrolyzed, make the metatitanic acid particle that obtains uneven, and the impurity that easily absorption is more, metatitanic acid washing time is not only made to extend, and the titanium dioxide particle obtained when calcination easily sinters, final titanium dioxide whiteness, reducing power and dispersiveness all can significantly be declined.

Titanium liquid stability is using 1mL titanium liquid as examination criteria, and particularly, titanium liquid stability represents to the milliliter number of required distilled water when just there is white opacity with every milliliter of titanium liquid 25 DEG C of distilled water dilutings.There is a serious deficiency in this kind of define method, be exactly that the judgement of titanium concentration to titanium liquid stability has a direct impact, the larger then stability of titanium concentration is higher, therefore should not judge with identical stability indicator that whether the stability of variable concentrations titanium liquid is qualified.

Usual titanium powder industry judge titanium liquid stability all with the qualified stability index of the qualified titanium liquid of automatic growing crystal species (concentration is as about 230g/L) (usually >=500mL) as judgment basis, the stability of the plus seed titanium liquid (concentration is about 190 ~ 200g/L) that this just causes concentration lower often occurs judging underproof phenomenon, but its stability essence is qualified, also namely occurs the situation of decision error.

Therefore, be necessary that the stability indicator to variable concentrations titanium liquid is specifically determined to address this problem, so that when different workshop sections titanium concentration is different, accurately judges that whether titanium liquid stability is qualified, thus ensure the qualified stability of the dense titanium liquid of final hydrolysis.

Summary of the invention

In order to solve deficiency of the prior art, the titanium liquid stability difference overcome due to variable concentrations uses greatly same stability indicator to judge the unreasonable present situation whether variable concentrations titanium liquid stability is qualified, the object of the present invention is to provide a kind of defining method of qualified stability index of variable concentrations titanium liquid, to calculate the qualified stability index that can meet the variable concentrations titanium liquid that hydrolytic stability requires, and then guarantee the strict control of each operation variable concentrations titanium liquid stability.

To achieve these goals, the invention provides a kind of defining method of qualified stability index of variable concentrations titanium liquid, it is characterized in that, directly determine that the qualified stability of variable concentrations titanium liquid refers to according to the following formula qualitative qualified index, mL; Wherein, V ₁with by 1 ml concn for c ₁the qualified titanium liquid of automatic growing crystal species represent to the distilled water milliliter number consumed when just there is white opacity with the distilled water diluting of 25 DEG C.

According to an embodiment of the defining method of the qualified stability index of variable concentrations titanium liquid of the present invention, c ₁for 230g/L, V ₁for>=500mL.

The inaccurate problem of plus seed titanium liquid determination of stability that the stability difference that the present invention can solve automatic growing crystal species and plus seed titanium liquid causes greatly, solve the defective actual qualified problem of surface judgement that plus seed titanium liquid detects stability, can judge that whether titanium liquid is qualified in the stability of different workshop section simultaneously, ensure that each operation variable concentrations titanium liquid stability is strictly controlled.

Embodiment

Hereinafter, the defining method of the qualified stability index of variable concentrations titanium liquid of the present invention will be described in detail in conjunction with example.

The object of the invention is to obtain the qualified stability index of titanium liquid of the same race and the relation of titanium concentration by theoretical analysis and calculation, thus directly calculate the qualified stability index of variable concentrations titanium liquid, and then judge that whether the stability of variable concentrations titanium liquid is qualified accurately.

Concrete theory deduction process is as described below:

First, defining the critical concentration that identical F value and the titanium liquid of identical impurity content just occurs when being hydrolyzed is c ₀, then 1mL concentration is c _xtitanium liquid to be measured be diluted to c ₀the volume V of 25 DEG C of required distilled water _xbe its stability, wherein F value is acidity quotient, and F value=effective acid concentration/titania total concentration=(be combined acid with titanium and measure+free acid amount)/titania total amount.Can obtain thus:

c ₀×(1+V _x)=c _x×1……（1）

Can be obtained by formula (1):

$V_X=\frac{c_x}{c_0}-1......\left(2\right)$

Wherein: c _xfor titanium concentration to be measured, g/L; c ₀for titanium liquid has just started critical concentration when being hydrolyzed, g/L; V _xfor concentration is c _xthe stability of titanium liquid to be measured, mL.

Usual concentration is the stability of the qualified titanium liquid of self crystal seed of 230g/L is 500 ~ 600mL, can calculate the c when the fluctuation of F value is little according to formula (2) ₀value in the scope of 0.38 ~ 0.46g/L.

Can obtain concentration by formula (2) is c ₁the qualified titanium liquid of automatic growing crystal species of g/L and concentration are c _xthe stability of the titanium liquid to be measured of g/L is respectively formula (3) and formula (4),

$V_1=\frac{c_1}{c_0}-1\≈\frac{c_1}{c_0}......\left(3\right)$

$V_x=\frac{c_x}{c_0}-1\≈\frac{c_x}{c_0}......\left(4\right)$

Due to c ₁, c _xall much larger than c ₀, approximate has:

$V_x=\frac{c_x}{c_1}\×V_1......\left(5\right)$

Usually the concentration c of the qualified titanium liquid of self crystal seed ₁be about 230g/L, its qualified stability index V ₁for>=500mL, and V ₁with by 1 ml concn for c ₁the qualified titanium liquid of automatic growing crystal species represent to the distilled water milliliter number consumed when just there is white opacity with the distilled water diluting of 25 DEG C.According to plus seed technique, the concentration of titanium liquid to be measured is 190 ~ 200g/L.Therefore, the qualified stability index V of the titanium liquid to be measured after adopting plus seed can be calculated according to formula (5) _xthen in actual production by the stability of the titanium liquid of the real time measure different workshop sections variable concentrations and its corresponding qualified stability index compare, thus know the titanium liquid determination of stability result of different workshop sections variable concentrations, and by debugging and ensureing finally to be hydrolyzed the qualified stability of dense titanium liquid.

Below by example, the present invention is described.

Example 1: determine that concentration is the qualified stability index that the plus seed of 195g/L is hydrolyzed dense titanium liquid.

With the qualified stability index of the qualified titanium liquid of 230g/L automatic growing crystal species be >=500ml for standard, according to formula (5) calculate,

$V_x=\frac{c_x}{c_1}\×V_1=\frac{195}{230}\×500=423$

It can thus be appreciated that the qualified stability index that concentration is the dense titanium liquid of plus seed of 190g/L is >=423ml.

Example 2: determine that concentration is the qualified stability index of titanium liquid after the turntable filtration of 160g/L.

With the qualified stability index of the qualified titanium liquid of 230g/L self crystal seed be >=500ml for standard, according to formula (5) calculate,

$\mathrm{Vx}=\frac{c_x}{c_1}\×V_1=\frac{160}{230}\×500=348$

It can thus be appreciated that the qualified stability index that the turntable that concentration is 160g/L filters rear titanium liquid is >=348ml.

Example 3: determine that concentration is the qualified stability index of the diluted Ti solution of 130g/L.

With 230g/L self crystal seed titanium liquid qualified stability index be >=500ml for standard, according to formula (5) calculate,

$V_x=\frac{c_x}{c_1}\×V_1=\frac{130}{230}\×500=283$

It can thus be appreciated that the qualified stability index that concentration is the diluted Ti solution of 130g/L is >=283ml.

After adopting the defining method of the qualified stability index of variable concentrations titanium liquid of the present invention, the stability that can meet the variable concentrations titanium liquid that hydrolytic stability requires can be calculated, and then ensure the strict control of each operation variable concentrations titanium liquid stability.

Although illustrate and describe the defining method of the qualified stability index of variable concentrations titanium liquid of the present invention above in conjunction with the embodiments, but what those skilled in the art will appreciate that is, when not departing from the spirit and scope of the present invention as claims restriction, the various changes in form and details can be made here.

Claims (2)

1. a defining method for the qualified stability index of variable concentrations titanium liquid, is characterized in that, directly determines the qualified stability index of variable concentrations titanium liquid according to the following formula:

$V_x=\frac{c_x}{c_1}\×V_1,$

V _xfor the qualified stability index of titanium liquid to be measured, mL;

C _xfor the concentration of titanium liquid to be measured, g/mL;

C ₁for the concentration of the qualified titanium liquid of automatic growing crystal species, g/mL;

V ₁for the qualified stability index of the qualified titanium liquid of automatic growing crystal species, mL;

Wherein, V ₁with by 1 ml concn for c ₁the qualified titanium liquid of automatic growing crystal species represent to the distilled water milliliter number consumed when just there is white opacity with the distilled water diluting of 25 DEG C.

2. the defining method of the qualified stability index of variable concentrations titanium liquid according to claim 1, is characterized in that, c ₁for 0.23g/mL, V ₁for>=500mL.