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

Abstract

The invention relates to a method for evaluating the hydration resistance of alkaline refractory materials. The technical solution is: measure the electrical conductivity λ ₀ of water, add the basic refractory material and water into the first beaker according to the solid-liquid mass ratio of 1: (500-800), and put them in a constant temperature drying oven at 25-30°C. Stand still for 0.25-0.5h, filter; pour the filtered hydration solution into the second beaker, and let it stand in a constant temperature drying oven at 25-30°C for 2-4h; detect the conductivity λ of the hydration solution in the second beaker, and get Concentration of Mg2 ⁺ in the hydration solution of basic refractories containing MgO Or get the Ca ²⁺ concentration in the hydration solution of basic refractories containing CaO Then, according to the evaluation reference table for the hydration resistance of the basic refractory containing MgO or CaO, the hydration resistance grade of the basic refractory to be evaluated can be obtained. The invention has the characteristics of simple method, high precision, wide evaluation range and good safety performance.

Description

A method for evaluating the hydration resistance of alkaline refractories

technical field

The invention belongs to the technical field of basic refractory application. In particular, it relates to a method for evaluating the hydration resistance of alkaline refractory materials.

Background technique

Since the advent of the basic converter steelmaking method in the 19th century, basic refractory materials have attracted much attention due to their excellent high-temperature performance and the ability to purify molten steel. At the same time, the inherent hydration characteristics of alkaline refractories also directly restrict their industrial production and use. How to accurately and comprehensively evaluate the hydration resistance of alkaline refractories has become an important parameter to measure the comprehensive performance of alkaline refractories, and is also a key issue to promote the development of alkaline refractories.

At present, the evaluation methods for the hydration resistance of alkaline refractory materials are different from country to country/region, which is mainly due to the difference in climate and environment such as temperature and humidity. The evaluation methods for the hydration resistance of alkaline refractories are mainly chemical reaction weight gain method and natural placement method.

The chemical reaction weight gain method mainly includes: boiling method and steam-autoclaved method.

The boiling method is used to evaluate the hydration resistance of basic refractory materials. Generally, the basic refractory materials are directly contacted with boiling water under normal pressure (1 standard atmospheric pressure) and kept for a certain period of time, and then the basic refractory materials and water are separated and separated. Weigh after fully drying, and evaluate the hydration resistance of the basic refractory through the mass change and pulverization rate of the basic refractory in contact with boiling water.

The water vapor-autoclaved method is used to evaluate the hydration resistance of basic refractory materials, which is to place the basic refractory materials in a closed environment, and under certain water vapor pressure conditions, make the basic refractory materials contact with water vapor, and the After a certain reaction time, it is weighed, and the hydration resistance of the basic refractory material is evaluated by the mass increase rate.

In short, the chemical reaction weight gain method mainly evaluates the hydration resistance of basic refractory materials through the change of macroscopic quality. High safety performance requirements.

Natural placement methods mainly include long-term storage at atmospheric pressure and constant temperature and humidity storage. The hydration resistance of alkaline refractory materials is evaluated by long-term storage at atmospheric pressure or constant temperature and humidity storage. The water in the environment will collapse and damage) or the quality change to evaluate the hydration resistance of basic refractory materials. However, this kind of evaluation method is obviously affected by the regional climate environment, the evaluation error is large, and the evaluation cycle is long (generally 3 to 6 months), it is difficult to comprehensively and accurately evaluate the hydration resistance of alkaline refractories.

Contents of the invention

The invention aims to overcome the defects of the prior art, and aims to provide a method for evaluating the hydration resistance of alkaline refractory materials with simple method, short period, high precision, wide evaluation range and good safety performance.

To achieve the above object, the technical solution adopted in the present invention is:

The first step is to crush the basic refractory material to 1-2 mm to obtain basic refractory material pellets.

Step 2: Weigh 1-5g of basic refractory granules and pour them into the first beaker, then measure the electrical conductivity λ ₀ of the water to be poured into the first beaker, and then use the basic refractory granules and The mass ratio of the water is 1: (500-800). Add the water into the first beaker.

In the third step, the first beaker after adding water is placed in a constant temperature drying oven at 25-30° C., and left to stand for 0.25-0.5 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2-4 hours; take out the second beaker, Measure the conductivity λ of the hydration solution in the second beaker.

The fifth step is to establish a mathematical model for the ion concentration of the hydration solution of alkaline refractories

(a) Mathematical model of Mg2 ⁺ concentration in the hydration solution of basic refractories containing MgO:

$\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

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

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

λ ₀ is the conductivity of water, S/m;

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

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; mol</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; .</span>$

(b) Mathematical model of Ca2 ⁺ concentration in the hydration solution of CaO-containing basic refractories:

$\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In formula (2): c(Ca ²⁺ ) is the concentration of Ca ²⁺ in the hydration solution of the alkaline refractory material containing CaO, mol/L;

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

λ ₀ is the conductivity of water, S/m;

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

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; mol</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; .</span>$

The 6th step, (a) obtain the concentration of Mg in the hydration solution of the basic refractory material containing MgO according to formula ( ¹ ), then obtain the evaluation of the hydration resistance of the basic refractory material containing MgO by Table 1 grade;

Table 1 Reference table for evaluation of hydration resistance of basic refractories containing MgO

(b) Obtain the concentration of Ca ²⁺ in the hydration solution of the basic refractory material containing CaO according to formula (2), and then obtain the evaluation grade of the hydration resistance of the basic refractory material containing CaO from Table 2.

Table 2 Reference table for evaluation of hydration resistance of alkaline refractories containing CaO

The basic refractory material is one of MgO-containing or CaO-containing refractory materials.

Described water is deionized water or is twice distilled water.

Owing to adopting above-mentioned technical scheme, the present invention has following positive effect compared with prior art:

1. Since the present invention does not need special detection equipment and processing technology in the evaluation process, the evaluation method is simple; there is no need to provide high temperature, high pressure and other test conditions during the evaluation process, and no toxic gas or solution is generated during the evaluation process, and the safety performance is good.

2. Since the present invention uses liquid water to directly contact the alkaline refractory material, the direct contact surface between the alkaline refractory material and water is increased, the evaluation accuracy of the hydration resistance of the alkaline refractory material is improved, and the evaluation error is reduced .

3. Since the present invention detects the conductivity of the hydration solution through the introduction of electrochemical means, the detection period is shortened, and the evaluation range of the hydration resistance of alkaline refractory materials is expanded. For alkaline refractory materials containing MgO or CaO All materials can be evaluated for hydration resistance.

Therefore, the invention has the characteristics of simple method, short period, high precision, wide evaluation range and good safety performance.

Detailed ways

The present invention will be further described below in conjunction with embodiment, not limiting the protection scope of the present invention:

Table 1 and Table 2 involved in this specific embodiment are first described in a unified manner as follows, and will not be repeated in the embodiments:

Table 1 Reference table for evaluation of hydration resistance of basic refractories containing MgO

Table 2 Reference table for evaluation of hydration resistance of alkaline refractories containing CaO

Example 1

A method for evaluating the hydration resistance of basic refractories containing MgO. The specific steps of the evaluation method are:

The first step is to crush the basic refractory material to 1-2mm to obtain basic refractory material pellets.

Step 2: Weigh 1-3g of basic refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 7.3×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (500-600). Add the water into the first beaker.

In the third step, the first beaker after adding water is placed in a constant temperature drying oven at 25-30° C., and left to stand for 0.45-0.50 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2-3 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 35.5×10 ^-4 S/m.

The 5th step, set up the mathematical model of Mg ^{concentration} in the hydration solution of the alkaline refractory material containing MgO:

$\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

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

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

λ ₀ is the conductivity of water, S/m;

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

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; mol</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; .</span>$

The 6th step, according to formula (1), the concentration of ^Mg in the hydration solution of the basic refractory material containing MgO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 35.5</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 7.3</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 7.5</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 1, the evaluation grade of the hydration resistance of the basic refractories containing MgO is "general".

The water described in this embodiment is twice distilled water.

Example 2

A method for evaluating the hydration resistance of basic refractories containing MgO. The specific steps of the evaluation method are:

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

Step 2: Weigh 1-3g of alkaline refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 6.8×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (600-700). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.35-0.40 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2-3 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 17.4×10 ^-4 S/m.

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

The 6th step, according to formula (1), the concentration of ^Mg in the hydration solution of the basic refractory material containing MgO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 17.4</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 6.8</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 1, the evaluation grade of the hydration resistance of the basic refractories containing MgO is "excellent".

The water described in this embodiment is twice distilled water.

Example 3

A method for evaluating the hydration resistance of basic refractories containing MgO. The specific steps of the evaluation method are:

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

Step 2: Weigh 2-4g of alkaline refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 9.6×10 ^-4 S/m, and then press The mass ratio of the basic refractory material granules to the water is 1: (550-650). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.30-0.35 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2.5-3.5 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 27.9×10 ^-4 S/m.

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

The 6th step, according to formula (1), the concentration of ^Mg in the hydration solution of the basic refractory material containing MgO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 27</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 9</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 8</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 1, the evaluation grade of the hydration resistance of the basic refractories containing MgO is "good".

The water described in this embodiment is deionized water.

Example 4

A method for evaluating the hydration resistance of basic refractories containing MgO. The specific steps of the evaluation method are:

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

Step 2: Weigh 3-5g of basic refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 7.5×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (700-800). Add the water into the first beaker.

In the third step, the first beaker after adding water is placed in a constant temperature drying oven at 25-30° C., and left to stand for 0.25-0.30 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 3-4 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 42.4×10 ^-4 S/m.

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

The 6th step, according to formula (1), the concentration of ^Mg in the hydration solution of the basic refractory material containing MgO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 42</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 9.2</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 5</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 1, the evaluation grade of the hydration resistance of the basic refractories containing MgO is "qualified".

The water described in this embodiment is twice distilled water.

Example 5

A method for evaluating the hydration resistance of basic refractories containing MgO. The specific steps of the evaluation method are:

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

Step 2: Weigh 3 to 5g of basic refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 9.1×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (650-750). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.40-0.45 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 3-4 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 54.5×10 ^-4 S/m.

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

The 6th step, according to formula (1), the concentration of ^Mg in the hydration solution of the basic refractory material containing MgO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Mg</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Mg</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 54.5</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 9.1</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 18.9</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1.2</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 1, it can be concluded that the evaluation grade of the hydration resistance of the basic refractories containing MgO is "unqualified".

The water described in this embodiment is deionized water.

Example 6

A method for evaluating the hydration resistance of alkaline refractories containing CaO. The specific steps of the evaluation method are:

The first step is to crush the basic refractory material to 1-2 mm to obtain basic refractory material pellets.

Step 2: Weigh 1-3g of alkaline refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 7.2×10 ^-4 S/m, and then press The mass ratio of the basic refractory material granules to the water is 1: (500-600). Add the water into the first beaker.

In the third step, the first beaker after adding water is placed in a constant temperature drying oven at 25-30° C., and left to stand for 0.45-0.50 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2-3 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 1.1 S/m.

The 5th step, establish the mathematical model of Ca ^{concentration} in the hydration solution of the alkaline refractory material containing CaO:

$\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In formula (2): c(Ca ²⁺ ) is the concentration of Ca ²⁺ in the hydration solution of the alkaline refractory material containing CaO, mol/L;

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

λ ₀ is the conductivity of water, S/m;

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

${\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; mol</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; .</span>$

The 6th step, according to formula (2), the ^{concentration} of Ca in the hydration solution of the basic refractory material containing CaO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1.1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 7.2</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 2.9</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 2, it can be concluded that the evaluation grade of the hydration resistance of the CaO-containing basic refractory is "good".

The water described in this embodiment is twice distilled water.

Example 7

A method for evaluating the hydration resistance of alkaline refractories containing CaO. The specific steps of the evaluation method are:

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

Step 2: Weigh 1-3g of alkaline refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 6.9×10 ^-4 S/m, and then press The mass ratio of the basic refractory material granules to the water is 1: (600-700). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.35-0.40 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2-3 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 2.8 S/m.

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

The 6th step, according to formula (2), the ^{concentration} of Ca in the hydration solution of the basic refractory material containing CaO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2.8</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 6.9</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 7.4</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 2, it can be concluded that the evaluation grade of the hydration resistance of the CaO-containing basic refractory is "qualified".

The water described in this embodiment is twice distilled water.

Example 8

A method for evaluating the hydration resistance of alkaline refractories containing CaO. The specific steps of the evaluation method are:

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

Step 2: Weigh 2-4g of alkaline refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 9.4×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (550-650). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.30-0.35 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 2.5-3.5 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 0.33 S/m.

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

The 6th step, according to formula (2), the ^{concentration} of Ca in the hydration solution of the basic refractory material containing CaO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 0.33</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 9.4</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 8.7</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 2, it can be concluded that the evaluation grade of the hydration resistance of the CaO-containing basic refractory is "excellent".

The water described in this embodiment is deionized water.

Example 9

A method for evaluating the hydration resistance of alkaline refractories containing CaO. The specific steps of the evaluation method are:

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

Step 2: Weigh 3 to 5g of basic refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 7.0×10 ^-4 S/m, and then press The mass ratio of the basic refractory material granules to the water is 1: (700-800). Add the water into the first beaker.

In the third step, the first beaker after adding water is placed in a constant temperature drying oven at 25-30° C., and left to stand for 0.25-0.30 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 3-4 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 2.3 S/m.

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

The 6th step, according to formula (2), the ^{concentration} of Ca in the hydration solution of the basic refractory material containing CaO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2.3</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 0</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 6.1</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 2, the evaluation grade of the hydration resistance of the basic refractories containing CaO is "general".

The water described in this embodiment is twice distilled water.

Example 10

A method for evaluating the hydration resistance of alkaline refractories containing CaO. The specific steps of the evaluation method are:

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

Step 2: Weigh 3-5g of basic refractory granules and pour them into the first beaker, then measure the conductivity λ ₀ of the water to be poured into the first beaker to be 9.3×10 ^-4 S/m, then press The mass ratio of the basic refractory material granules to the water is 1: (650-750). Add the water into the first beaker.

The third step is to place the first beaker after adding water in a constant temperature drying oven at 25-30° C., and let it stand still for 0.40-0.45 hours.

Step 4: Take out the first beaker and filter; then pour the filtered hydration solution into the second beaker, place it in a constant temperature drying oven at 25-30°C, and let it stand for 3-4 hours; take out the second beaker, The conductivity λ of the hydration solution in the second beaker was detected to be 3.5 S/m.

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

The 6th step, according to formula (2), the ^{concentration} of Ca in the hydration solution of the basic refractory material containing CaO:

$\begin{array}{c}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Ca</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; +</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&lambda;</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; \&lambda;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; K</span>}}_{\mathrm{<span\; class="notranslate">\; Ca</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Oh</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1000</span>}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3.5</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 9.3</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 188</span>}<span\; class="notranslate">\; .</span>\mathrm{<span\; class="notranslate">\; 4</span>}\\ <span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 9.3</span>}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; 10</span>}}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; mol</span>}<span\; class="notranslate">\; /</span>\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; )</span>\end{array}$

From Table 2, it can be concluded that the evaluation grade of the hydration resistance of CaO-containing basic refractories is "unqualified".

The water described in this embodiment is deionized water.

Compared with the prior art, this specific embodiment has the following positive effects:

1. Since this specific embodiment does not require special detection equipment and processing technology in the evaluation process, the evaluation method is simple; in the evaluation process, there is no need to provide test conditions such as high temperature and high pressure, and no toxic gas or solution is produced during the evaluation process, and the safety performance good.

2. Since this specific embodiment uses liquid water to directly contact and react with the alkaline refractory material, the direct contact surface between the alkaline refractory material and water is increased, the evaluation accuracy of the hydration resistance of the alkaline refractory material is improved, and the evaluation error.

3. Due to the introduction of electrochemical means to detect the conductivity of the hydration solution in this specific embodiment, the detection cycle is shortened, and the evaluation range of the hydration resistance of alkaline refractory materials is expanded. For alkalis containing MgO or CaO All permanent refractory materials can be evaluated for hydration resistance.

Therefore, this embodiment has the characteristics of simple method, short period, high precision, wide evaluation range and good safety performance.

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.