CN104122302A - Method for evaluating hydration resistance of basic refractory - Google Patents

Abstract

The invention relates to a method for evaluating the hydration resistance of basic refractory. According to the technical scheme, the method comprises the following steps of measuring the electrical conductivity lambda 0 of water; feeding a basic refractory particle material and the water into a first beaker according to the solid-liquid mass ratio of 1 to (500-800); enabling the first beaker to stand in a constant-temperature drying box for 0.25-0.5h at the temperature of 25-30 DEG C, and filtering; after that, pouring a hydrated solution into a second beaker, and enabling the second beaker to stand in the constant-temperature drying box for 2-4h at the temperature of 25-30 DEG C; and detecting the electrical conductivity lambda of the hydrated solution in the second beaker to obtain the concentration of Ma<2+> in the hydrated solution of the basic refractory containing MgO with the formula of c (Mg<2+>)=1000 (lambda-lambda0)/2K(Mg(OH)2) or the concentration of Ca<2+> in the hydrated solution of the basic refractory containing CaO with the formula of c (Ca<2+>)=1000 (lambda-lambda0)/ 2K(Ca(OH)2), thus obtaining the hydration resistance level of the basic refractory to be evaluated according to an evaluating reference table for the hydration resistance of the basic refractory containing MgO or CaO. The method has the characteristics of being simple, high in accuracy, wide in evaluation range and good in safety performance.

Description

A kind of evaluation method of basic refractory hydration resistance

Technical field

The invention belongs to basic refractory applied technical field.Be specifically related to a kind of evaluation method of basic refractory hydration resistance.

Background technology

Since 19th century, Thomas-Gilchrist process was come out, basic refractory receives much concern owing to having good applied at elevated temperature performance and the characteristic of cleaning molten steel.Meanwhile, the intrinsic hydration characteristics of basic refractory has also directly restricted its suitability for industrialized production and use.How accurately, the hydration resistance of evaluating all sidedly basic refractory becomes the important parameter of weighing basic refractory combination property, is also the key issue that promotes basic refractory development.

At present, all variant to the evaluation method various countries/area of basic refractory hydration resistance, this is mainly due to due to the climatic environment such as temperature, humidity difference.The evaluation method of basic refractory hydration resistance is taking chemical reaction weightening finish method and natural placement methods as main.

Chemical reaction weightening finish method mainly comprises: boiling method and water vapor-autoclave method.

Adopt boiling method to evaluate the hydration resistance of basic refractory, generally under normal pressure (1 standard atmospheric pressure), basic refractory directly contacted with boiling water and keep certain hour, then separate basic refractory and moisture, and weigh after fully dry, the mass change occurring by basic refractory and boiling water contact reaction and pulverization rate are evaluated the hydration resistance of basic refractory.

Adopt water vapor-autoclave method to evaluate the hydration resistance of basic refractory, that basic refractory is placed in to closed environment, under certain water vapour pressure condition, basic refractory is contacted with water vapor, after certain reaction time, weigh, evaluate the hydration resistance of basic refractory material by percent mass penalty.

In a word, chemical reaction weightening finish method is mainly to evaluate the hydration resistance of basic refractory by the variation of macroscopic quality, its shortcoming be low to the evaluation precision of basic refractory hydration resistance, error large or require high to the security performance of valuator device.

Nature placement methods mainly comprises the long-term preservation method of normal pressure and constant temperature and humidity preservation method.Adopt the long-term preservation of normal pressure or constant temperature and humidity preservation method to evaluate the hydration resistance of basic refractory, be that basic refractory is directly exposed in air or constant environment, observe (basic refractory absorbs moisture in external environment and avalanche damage) or mass change and evaluate the hydration resistance of basic refractory by long-term profile.But the evaluation method of this class is subject to the impact of regional climate environment obvious, and error of quality appraisement is larger, and evaluation cycle grows (general 3～6 months), is difficult to comprehensively, accurately evaluate the hydration resistance of basic refractory.

Summary of the invention

The present invention is intended to overcome prior art defect, and object is to provide the evaluation method of the basic refractory hydration resistance that a kind of method is simple, the cycle is short, precision is high, range of value is wide and security performance is good.

For achieving the above object, the technical solution adopted in the present invention is:

The first step, basic refractory is crushed to 1～2mm, obtains basic refractory particulate material.

Second step, take 1～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀, be then 1 by the mass ratio of described basic refractory particulate material and described water: (500～800) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.25～0.5 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～4 hours; Take out the second beaker, detect the conductivity λ of aquation solution in the second beaker.

The 5th step, set up the mathematical model of the aquation solution ion concentration of basic refractory

(a) containing Mg in the aquation solution of the basic refractory of MgO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}---\left(1\right)$

In formula (1): c (Mg ²⁺) be Mg in the aquation solution of the basic refractory containing MgO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Mg (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}=18.9m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1}.$

(b) containing Ca in the aquation solution of the basic refractory of CaO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}---\left(2\right)$

In formula (2): c (Ca ²⁺) be Ca in the aquation solution of the basic refractory containing CaO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Ca (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}=188.4m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1}.$

The 6th step, (a) obtain containing Mg in the aquation solution of the basic refractory of MgO according to formula (1) ²⁺concentration, more obtain the opinion rating containing the basic refractory hydration resistance of MgO by table 1;

Table 1 is containing the evaluation reference table of the basic refractory hydration resistance of MgO

(b) obtain containing Ca in the aquation solution of the basic refractory of CaO according to formula (2) ²⁺concentration, more obtain the opinion rating containing the basic refractory hydration resistance of CaO by table 2.

Table 2 is containing the evaluation reference table of the basic refractory hydration resistance of CaO

Described basic refractory is containing MgO or is the one containing in the fire resistive material of CaO.

Described water is deionized water or is redistilled water.

Owing to adopting technique scheme, the present invention compared with prior art has following good effect:

1, due to the present invention in evaluation procedure without special checkout equipment and treatment technology, therefore evaluation method is simple; In evaluation procedure, also without the test condition such as high temperature, high pressure is provided, evaluation procedure nonhazardous gas or solution produce, and security performance is good.

2, because the present invention adopts aqueous water directly and basic refractory contact reaction, increase the direct contact surface of basic refractory and water, improved the evaluation precision of basic refractory hydration resistance, reduced error of quality appraisement.

3, because the present invention passes through the introducing of electrochemical means with the conductivity of detection aquation solution, shorten the cycle of detecting, expand the range of value of basic refractory hydration resistance, to all carrying out hydration resistance evaluation containing MgO or containing the basic refractory of CaO.

Therefore, the present invention has the advantages that method is simple, the cycle is short, precision is high, range of value is wide and security performance is good.

Embodiment

Below in conjunction with embodiment, the invention will be further described, not limiting the scope of the invention:

The table 1 first this embodiment being related to and table 2 are unified to be described below, and in embodiment, repeats no more:

Table 1 is containing the evaluation reference table of the basic refractory hydration resistance of MgO

Table 2 is containing the evaluation reference table of the basic refractory hydration resistance of CaO

Embodiment 1

A kind of evaluation method of the basic refractory hydration resistance containing MgO.The concrete steps of described evaluation method are:

The first step, basic refractory is crushed to 1～2mm, obtains basic refractory particulate material.

Second step, take 1～3g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 7.3 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (500～600) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.45～0.50 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～3 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 35.5 × 10 ^-4s/m.

The 5th step, foundation are containing Mg in the aquation solution of the basic refractory of MgO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}---\left(1\right)$

In formula (1): c (Mg ²⁺) be Mg in the aquation solution of the basic refractory containing MgO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Mg (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}=18.9m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1}.$

The 6th step, according to formula (1), containing Mg in the aquation solution of the basic refractory of MgO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(35.5\&times;{10}^{-4}-7.3\&times;{10}^{-4})/2\&times;18.9\\ =7.5\&times;{10}^{-5}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of MgO by table 1 is " generally ".

Water described in the present embodiment is redistilled water.

Embodiment 2

A kind of evaluation method of the basic refractory hydration resistance containing MgO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 1.

Second step, take 1～3g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 6.8 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (600～700) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.35～0.40 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～3 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 17.4 × 10 ^-4s/m.

The 5th step, with the 5th step of embodiment 1.

The 6th step, according to formula (1), containing Mg in the aquation solution of the basic refractory of MgO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(17.4\&times;{10}^{-4}-6.8\&times;{10}^{-4})/2\&times;18.9\\ =2.8\&times;{10}^{-5}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of MgO by table 1 is " excellent ".

Water described in the present embodiment is redistilled water.

Embodiment 3

A kind of evaluation method of the basic refractory hydration resistance containing MgO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 1.

Second step, take 2～4g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 9.6 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (550～650) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.30～0.35 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2.5～3.5 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 27.9 × 10 ^-4s/m.

The 5th step, with the 5th step of embodiment 1.

The 6th step, according to formula (1), containing Mg in the aquation solution of the basic refractory of MgO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(27.9\&times;{10}^{-4}-9.6\&times;{10}^{-4})/2\&times;18.9\\ =4.8\&times;{10}^{-5}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of MgO by table 1 is " good ".

Water described in the present embodiment is deionized water.

Embodiment 4

A kind of evaluation method of the basic refractory hydration resistance containing MgO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 1.

Second step, take 3～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 7.5 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (700～800) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.25～0.30 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 3～4 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 42.4 × 10 ^-4s/m.

The 5th step, with the 5th step of embodiment 1.

The 6th step, according to formula (1), containing Mg in the aquation solution of the basic refractory of MgO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(42.4\&times;{10}^{-4}-7.5\&times;{10}^{-4})/2\&times;18.9\\ =9.2\&times;{10}^{-5}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of MgO by table 1 is " qualified ".

Water described in the present embodiment is redistilled water.

Embodiment 5

A kind of evaluation method of the basic refractory hydration resistance containing MgO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 1.

Second step, take 3～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 9.1 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (650～750) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.40～0.45 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 3～4 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 54.5 × 10 ^-4s/m.

The 5th step, with the 5th step of embodiment 1.

The 6th step, according to formula (1), containing Mg in the aquation solution of the basic refractory of MgO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(54.5\&times;{10}^{-4}-9.1\&times;{10}^{-4})/2\&times;18.9\\ =1.2\&times;{10}^{-4}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of MgO by table 1 is " defective ".

Water described in the present embodiment is deionized water.

Embodiment 6

A kind of evaluation method of the basic refractory hydration resistance containing CaO.The concrete steps of described evaluation method are:

The first step, basic refractory is crushed to 1～2mm, obtains basic refractory particulate material.

Second step, take 1～3g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 7.2 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (500～600) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.45～0.50 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～3 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 1.1S/m.

The 5th step, foundation are containing Ca in the aquation solution of the basic refractory of CaO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}---\left(2\right)$

In formula (2): c (Ca ²⁺) be Ca in the aquation solution of the basic refractory containing CaO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Ca (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}=188.4m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1}.$

The 6th step, according to formula (2), containing Ca in the aquation solution of the basic refractory of CaO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(1.1-7.2\&times;{10}^{-4})/2\&times;188.4\\ =2.9\&times;{10}^{-3}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of CaO by table 2 is " good ".

Water described in the present embodiment is redistilled water.

Embodiment 7

A kind of evaluation method of the basic refractory hydration resistance containing CaO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 6.

Second step, take 1～3g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 6.9 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (600～700) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.35～0.40 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～3 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 2.8S/m.

The 5th step, with the 5th step of embodiment 6.

The 6th step, according to formula (2), containing Ca in the aquation solution of the basic refractory of CaO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(2.8-6.9\&times;{10}^{-4})/2\&times;188.4\\ =7.4\&times;{10}^{-3}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of CaO by table 2 is " qualified ".

Water described in the present embodiment is redistilled water.

Embodiment 8

A kind of evaluation method of the basic refractory hydration resistance containing CaO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 6.

Second step, take 2～4g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 9.4 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (550～650) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.30～0.35 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2.5～3.5 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 0.33S/m.

The 5th step, with the 5th step of embodiment 6.

The 6th step, according to formula (2), containing Ca in the aquation solution of the basic refractory of CaO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(0.33-9.4\&times;{10}^{-4})/2\&times;188.4\\ =8.7\&times;{10}^{-4}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of CaO by table 2 is " excellent ".

Water described in the present embodiment is deionized water.

Embodiment 9

A kind of evaluation method of the basic refractory hydration resistance containing CaO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 6.

Second step, take 3～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 7.0 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (700～800) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.25～0.30 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 3～4 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 2.3S/m.

The 5th step, with the 5th step of embodiment 6.

The 6th step, according to formula (2), containing Ca in the aquation solution of the basic refractory of CaO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(2.3-7.0\&times;{10}^{-4})/2\&times;188.4\\ =6.1\&times;{10}^{-3}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of CaO by table 2 is " generally ".

Water described in the present embodiment is redistilled water.

Embodiment 10

A kind of evaluation method of the basic refractory hydration resistance containing CaO.The concrete steps of described evaluation method are:

The first step, with the first step of embodiment 6.

Second step, take 3～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀be 9.3 × 10 ^-4then S/m is 1 by the mass ratio of described basic refractory particulate material and described water: (650～750) add described water in the first beaker.

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.40～0.45 hour.

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 3～4 hours; Take out the second beaker, the conductivity λ that detects aquation solution in the second beaker is 3.5S/m.

The 5th step, with the 5th step of embodiment 6.

The 6th step, according to formula (2), containing Ca in the aquation solution of the basic refractory of CaO ²⁺concentration:

$\begin{array}{c}c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}\\ =1000\&times;(3.5-9.3\&times;{10}^{-4})/2\&times;188.4\\ =9.3\&times;{10}^{-3}(\mathrm{mol}/L)\end{array}$

Obtaining containing the opinion rating of the basic refractory hydration resistance of CaO by table 2 is " defective ".

Water described in the present embodiment is deionized water.

This embodiment compared with prior art has following good effect:

1, due to this embodiment in evaluation procedure without special checkout equipment and treatment technology, therefore evaluation method is simple; In evaluation procedure, also without the test condition such as high temperature, high pressure is provided, evaluation procedure nonhazardous gas or solution produce, and security performance is good.

2, because this embodiment adopts aqueous water directly and basic refractory contact reaction, increase the direct contact surface of basic refractory and water, improved the evaluation precision of basic refractory hydration resistance, reduced error of quality appraisement.

3, because this embodiment is passed through the introducing of electrochemical means with the conductivity of detection aquation solution, shorten the cycle of detecting, expand the range of value of basic refractory hydration resistance, to all carrying out hydration resistance evaluation containing MgO or containing the basic refractory of CaO.

Therefore, this embodiment has the advantages that method is simple, the cycle is short, precision is high, range of value is wide and security performance is good.

Claims (3)

1. an evaluation method for basic refractory hydration resistance, is characterized in that evaluation procedure is as follows:

The first step, basic refractory is crushed to 1～2mm, obtains basic refractory particulate material;

Second step, take 1～5g basic refractory particulate material and pour in the first beaker, then record the electrical conductivity of water λ that intends pouring into the first beaker ₀, be then 1 by the mass ratio of described basic refractory particulate material and described water: (500～800) add described water in the first beaker;

The 3rd step, the first beaker after adding water is placed in to the thermostatic drying chamber of 25～30 DEG C, leaves standstill 0.25～0.5 hour;

The 4th step, taking-up the first beaker, filter; Again the aquation solution after filtering is poured in the second beaker, be placed in the thermostatic drying chamber of 25～30 DEG C, leave standstill 2～4 hours; Take out the second beaker, detect the conductivity λ of aquation solution in the second beaker;

The 5th step, set up the mathematical model of the aquation solution ion concentration of basic refractory

(a) containing Mg in the aquation solution of the basic refractory of MgO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Mg}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}---\left(1\right)$

In formula (1): c (Mg ²⁺) be Mg in the aquation solution of the basic refractory containing MgO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Mg (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Mg}{\left(\mathrm{OH}\right)}_2}=18.9m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1};$

(b) containing Ca in the aquation solution of the basic refractory of CaO ²⁺the mathematical model of concentration:

$c\left({\mathrm{Ca}}^{2+}\right)=1000(\mathrm{\&lambda;}-{\mathrm{\&lambda;}}_0)/2K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}---\left(2\right)$

In formula (2): c (Ca ²⁺) be Ca in the aquation solution of the basic refractory containing CaO ²⁺concentration, mol/L;

λ is the conductivity of aquation solution, S/m;

λ ₀for electrical conductivity of water, S/m;

for Ca (OH) ₂the proportionality constant of electrical conductivity of solution,

$K_{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}=188.4m^2\&CenterDot;S\&CenterDot;{\mathrm{mol}}^{-1};$

The 6th step, (a) obtain containing Mg in the aquation solution of the basic refractory of MgO according to formula (1) ²⁺concentration, more obtain the opinion rating containing the basic refractory hydration resistance of MgO by table 1;

Table 1 is containing the evaluation reference table of the basic refractory hydration resistance of MgO

(b) obtain containing Ca in the aquation solution of the basic refractory of CaO according to formula (2) ²⁺concentration, more obtain the opinion rating containing the basic refractory hydration resistance of CaO by table 2.

Table 2 is containing the evaluation reference table of the basic refractory hydration resistance of CaO

2. the evaluation method of basic refractory hydration resistance according to claim 1, is characterized in that described basic refractory is containing MgO or is the one containing in the fire resistive material of CaO.

3. the evaluation method of basic refractory hydration resistance according to claim 1, is characterized in that described water is deionized water or is redistilled water.