TWI600769B - Sand blast furnace slag fast screening test - Google Patents

Description

Sand stone furnace quick screening test

The invention relates to a method for detecting sand and gravel furnace; in particular, to a quick screening detection method capable of quickly detecting whether a sandstone contains a furnace.

In the technical field of the iron and steel industry, a common waste product of the furnace is usually produced in the process of refining pig iron. When the iron ore raw material, limestone, and coal are mixed together and heated to 1300 ° C to form a molten state, the iron will be Iron water is separated from the iron ore and once the molten iron is cooled, a furnace is produced. Due to the different processes and treatment methods of steelmaking, the types and proportions of the furnace components will be slightly different. In general, the main component of the furnace is nothing more than a mixture of calcium, magnesium and a few elements melted and separated from bismuth, aluminum and limestone, usually containing more than 10% soluble cerium oxide (SiO ₂ ), and More than 30% of calcium oxide (CaO), and most of the furnace is strongly alkaline, and the pH is usually about 12.

Generally, furnaces can be classified according to different steelmaking processes, usually including converters, desulfurization furnaces, dephosphorization furnaces, electric arc furnaces, stainless steel crucibles, desulfurization furnaces, and blast furnaces. Hey. In general, an electric arc furnace is an electric furnace that smelts ore and metal at a high temperature generated by an electrode arc. When the gas discharge forms an arc, the energy is concentrated, and the arc temperature is above 3000 °C. For smelting metal, the electric arc furnace has greater flexibility than other steelmaking furnaces, and can effectively remove impurities such as sulfur and phosphorus, the furnace temperature is easy to control, and the equipment has a small footprint, which is suitable for the melting of high-quality alloy steel.

In the process of steel metallurgy, a large number of furnaces are generated and difficult to reuse, and it has begun to seriously harm the environment and hinder the development of the industry. The conventional technology treats these wastes by using a furnace that is discharged at 1500-1600 ° C, cooling with water, then fishing, drying, and milling, and then used for cement production, but this method can only treat part of the waste, and Waste water and waste gas are also generated during the treatment, and a large amount of heat energy generated by the blast furnace furnace is not only wasted, but also a factor that is harmful to the environment.

Most of the domestic aluminum smelting furnaces are to be stacked or buried in the factory for treatment after cooling. In addition, in addition to the above-mentioned main components, the aluminum smelting furnace contains other traces of heavy metals, so the aluminum smelting furnace is classified as a hazardous business waste. As a result, it is necessary to solidify the aluminum smelting furnace before stacking or burying, which will be a burden for the related manufacturers of aluminum smelting furnaces. In addition, aluminum smelting furnaces are susceptible to moisture and hydrolysis in the air to produce ammonia, methane and hydrogen. If improperly handled, it will have a great impact on the environment and may also endanger human health.

Although the furnace can be recycled and reused, and has been widely used as engineering materials, for example, the furnace is applied to the road base layer, concrete pellets and cement raw materials in foreign countries, and at the present stage, it is still mainly used as roadbed backfilling materials. And found that there is a potential volume expansion problem, so the industry has great doubts about its application as a pellet in cement concrete; in addition, the furnace is a hazardous business waste, although the domestic authorities also tend to reuse the furnace, but the reality There are many vulnerabilities on the top. If the furnace is not arbitrarily doped in the sand and gravel according to the regulations, it will not be inspected and will endanger the quality of the building, and will also affect the reputation of the concrete manufacturer. This is not the so-called reuse, but the disposal of commercial waste. And produce serious quality defects for buildings.

In view of the above, the present inventors have diligently studied and searched for various possible solutions for solving the above-mentioned problems of the conventional technology, and have developed a method capable of rapidly screening out whether or not a sandstone is doped with a furnace. Control the quality of sand and gravel materials in buildings.

In other words, according to a preferred embodiment of the present invention, a sand and stone furnace quick screening test method can be provided, which comprises the following steps: a phenolphthalein test step: mixing a plurality of sandstones with water to form a mixed liquid, and adding a phenolphthalein reagent to observe the Whether the mixed liquid is discolored, and when the mixed liquid is not discolored, the quality of the sand is judged as qualified; pH acid and alkali test step: detecting the pH of the mixed liquid in the above phenolphthalein test step, when the mixed liquid is used When the pH value is less than 10, the quality of the sand is judged as qualified; the magnetic test step: for the mixed liquid having a pH value greater than 10 in the pH acid-base test step, the ferrite magnet is observed near the sand stone and observed Whether a magnetic attraction reaction occurs, and then component analysis is performed on the sandstone in which the magnetic attraction reaction has not occurred, and when the result of the component analysis is no abnormality, the quality of the sand and gravel is judged to be acceptable; or, for the occurrence of the magnetic attraction reaction The sand and gravel are subjected to sub-analysis and hot-pressure expansion test. When the results of the component analysis and the hot-pressure expansion test are no abnormalities, the quality of the sand and gravel is judged as qualified; Results of the pressure bulge test at least one abnormality display, i.e. determining the plurality of sand contained in the furnace ballast, sand and the quality of determined to be defective.

According to another aspect of the present invention, the present invention can provide a sand and stone furnace quick screening test method, wherein the mixing ratio of the sandstones to water in the phenolphthalein test step is 10:1 to 1:10; Good for 5:1 to 1:5, best for 1:1.

According to still another aspect of the present invention, the present invention can also provide a sand and stone furnace quick screening test method, wherein the concentration of the phenolphthalein reagent in the phenolphthalein test step is 0.1% to 10%, preferably 0.3% to 8%. More preferably, it is 0.5% to 7%, and most preferably 1%.

According to another aspect of the present invention, the present invention can also provide a sand and stone furnace quick screening test method, wherein the pH acid and alkali test is performed by an acid-base concentration meter.

According to another embodiment of the present invention, in the sand stone furnace quick screening method provided by the present invention, the magnetic testing step first removes the sand from the mixed liquid and dries to constant weight. .

According to another embodiment of the present invention, in the sand stone furnace quick screening test method provided by the present invention, the sand stone component analysis step is to determine the percentage of total calcium (Ca) elements in the sand and gravel and The percentage of the total amount of yttrium (Si) element, and the ratio of the percentage of the total amount of the calcium element to the total percentage of the lanthanum element (Ca/Si) is calculated, and when the Ca/Si value is <0.2, it is judged as pass; otherwise, when Ca When the /Si value is ≧0.2, it is judged to be abnormal.

According to still another embodiment of the present invention, in the sand and stone furnace quick screening test method provided by the present invention, the hot pressure expansion test is a cylindrical body formed by using an appropriate amount of cement, sand, and water. After heating for a period of time at a suitable vapor pressure and temperature, cooling to room temperature; then, observing whether a blasthole of a tapered shape appears on the surface of the square cylindrical solid, and when the number of the blasting holes is <1 and the square column entity If there is no break, it is judged as qualified; on the contrary, when the number of the blast holes is ≧1 or the cylindrical body is broken, it is judged to be abnormal.

According to another embodiment of the present invention, in the sand stone furnace quick screening method provided by the present invention, the vapor pressure is in the range of 20.1 to 21.5 kgf/cm ² ; and the above temperature is 214.0 to The range of 217.4 ° C; in the above-mentioned hot-press expansion test, within 45 to 75 minutes from the start of heating, the steam pressure is preferably raised to 20.8 kgf / cm ² or more, to 20.8 ± 0.7 kgf / cm ² or 215.7 ± 1.7 ° C After three hours of maintenance, it decreased from 20.8 kgf/cm ² to less than 0.7 kgf/cm ² in 1.5 hours. Preferably, the square cylindrical body is taken out after cooling to determine.

According to still another aspect of the present invention, in the sand and stone furnace quick screening detection method provided by the present invention, the particle size of the sandstone is in the range of 0.6 mm to 2.5 mm; preferably 0.7 mm to 2.4 mm. The range; more preferably in the range of 0.8 mm to 2.3 mm; most preferably in the range of 0.9 mm to 2.2 mm; for example, it may be 2.36 mm, 1.18 mm, or 0.6 mm.

According to another aspect of the present invention, the present invention can further provide a sand and stone furnace quick screening test method, wherein the hot pressure expansion test is performed by gradually heating and increasing pressure, followed by cooling and cooling.

By means of the present invention, a series of simple test steps and methods can be used to quickly screen out whether or not the sand contains a furnace through the results of each step, and thus can be used to determine whether the quality of the sand is qualified or abnormal.

In the following, the embodiments of the present invention will be described in more detail in the detailed description of the embodiments of the present invention so that the spirit and content of the present invention are more complete and easy to understand; however, those of ordinary skill in the art should understand The invention is of course not limited to these examples, and other similar or equivalent functions and order of steps may be utilized to achieve the invention.

Descriptive descriptions of specific terms or nouns used in this specification. The scientific and technical terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention pertains, unless otherwise defined herein.

In this context, the numerical values and parameters used to define the scope of the invention intrinsically inevitably contain standard deviations due to individual test methods, and are therefore mostly expressed in approximate numerical values, although in specific embodiments Relevant values that are presented as accurately as possible. As used herein, "about" generally refers to the consideration of those of ordinary skill in the art to which the invention pertains, and generally means that the actual value falls within an acceptable standard error of the average value, for example, the actual value is in one Within ±10%, ±5%, ±1%, or ±0.5% of a particular value or range.

In a preferred embodiment of the invention, the invention comprises the test procedure shown in Figure 1. In other words, the present invention includes: a phenolphthalein test step (S1): mixing a plurality of sandstones with water to form a mixed solution, and adding a phenolphthalein reagent to observe whether the mixture is discolored, and when the mixture is not discolored, the quality of the sandstone is It is judged as qualified (D1); pH acid-base test step (S2): the pH value of the mixed liquid in the above phenolphthalein test step is detected, and when the pH value of the mixed liquid is less than 10, the sandstone is The quality is judged as qualified (D2); the magnetic test step (S3): for the mixed liquid having a pH value greater than 10 in the above pH acid-base test step, the ferrite magnet is placed close to the sand and the magnetic attraction reaction is observed, and then For component analysis (S4) of the sand without magnetic attraction reaction, when the component analysis results in no abnormality, the quality of the sand is judged as qualified (D3); or, for the sand having the magnetic reaction The stone is subjected to sub-analysis and hot-pressure expansion test (S5). When the result of the component analysis and the hot-pressure expansion test is no abnormality, the quality of the sand and gravel is judged as qualified (D4); when the component analysis and the hot-pressure expansion test At least one of the results shows a difference When it is judged that the plurality of sand contained in the furnace ballast, whereas the quality of sand is determined as defective (D5).

As a preferred embodiment of the invention described above, further description will be made below for each test step and the manner in which the quality of the gravel is qualified or abnormal.

Phenolphthalein test procedure

Phenolphthalein is a chemical product that is crystalline and almost insoluble in water. Its characteristics are colorless in acidic and neutral solutions, purple-red in alkaline solution, and the transition color transition pH range is about 8.3-10.0.

The phenolphthalein test in the present invention is to add 250 g of the sand to 250 g of water and mix uniformly, and add 1% by weight of a phenolphthalein reagent of 1% by weight to 5 c.c. to observe whether the liquid is discolored; wherein the concentration is 1 The proportion of the phenolphthalein reagent was 8.81 g of phenolphthalein mixed with 872.19 g of 70% alcohol and mixed evenly.

"pH acid and alkali test steps"

The acid-base concentration meter is an electronic instrument for measuring the pH of a liquid, and can confirm the acidity and alkalinity of the substance. A typical acid-base concentration meter measures the potential of the analyte from a glass-electrode measuring probe and transmits it to a voltmeter and displays the pH reading.

The pH acid-base test in the present invention is to add 250 g of the sand and gravel to 250 g of water and mix uniformly, and test with an acid-base concentration meter. After waiting for 3-5 minutes, the pH ≧ 10 is abnormal.

Magnetic Suction Test Procedure

Magnetically, paramagnetic or ferromagnetic materials tend to move toward a region where the magnetic field is stronger, that is, attracted by a magnetic field; diamagnetic materials tend to move toward a weaker magnetic field, that is, by a magnetic field. A magnet refers to an object or device that is used to generate a magnetic field. As a magnetic dipole, the magnet can attract ferromagnetic substances such as metals such as iron, nickel and cobalt.

In the magnetic attraction test of the present invention, after 200 g of the sandstones are dried at 100±5 ° C to constant weight or 24 hours, magnetic attraction is performed by a magnet, and if there is a magnetic attraction reaction, if there is no suction, if there is no suction Any object is a non-magnetic reaction.

"Sandstone composition analysis"

X-ray Fluorescence Spectrometer (XRF spectrometer) is a fast, non-destructive method for measuring substances. X-ray fluorescence is a typical "secondary" X-ray from the emission of a material that is excited by bombardment with high energy X-rays or gamma rays. This phenomenon is widely used in elemental analysis and chemical analysis, especially in the investigation and research of metals, glass, ceramics and building materials. XRF uses X-ray or other excitation source to illuminate the sample to be analyzed. After the inner electrons of the element in the sample are shot out, it causes a transition of the extranuclear electrons. When the excited electron returns to the ground state, the characteristic X-ray is emitted; Different elements emit their characteristic X-rays with different energy or wavelength characteristics.

The sand component analysis of the present invention measures the percentage of the total amount of calcium (Ca) elements in the sand and the total amount of cerium (Si) elements by an X-ray fluorescence analyzer, and calculates the percentage of the total amount of the calcium elements relative to the 矽The ratio of the total percentage of elements (Ca/Si), Ca/Si value <0.2 is acceptable, and Ca/Si value ≧0.2 is abnormal.

"Hot Compression Test"

The thermal expansion coefficient of concrete itself will affect the quality of the building itself. In addition, the steel and concrete have approximately the same thermal expansion coefficient. At the same temperature, the displacement between steel and concrete is small. When the concrete hardens, the cement and steel surface have good surface. Bonding allows any stress to be effectively transferred between the two. If the concrete's raw materials, such as sand, are abnormal, changes in the coefficient of thermal expansion will affect the safety of the building.

The hot-pressure expansion test of the present invention is made of 500 g of cement, 1375 g of the sand, and 243 g of water to make a cylindrical body of 25 x 25 x 285 mm, placed in a high pressure cooking pot, and heated to 20.8 ± 0.7 kgf. After maintaining for 3 hours at /cm ² or 215.7 ±1.7 °C, the square cylindrical body is taken out after cooling; if there is a cone-shaped blast hole on the surface of the square column, the number of holes is ≧1 or the square appears. The case of the cylindrical solid fracture is abnormal. If the number of the blasting holes on the surface of the cylindrical solid body is <1 and the square column body is not broken, it is qualified.

In the hot-pressure expansion test of the present invention, the steam pressure is raised to 20.8 kgf/cm ² within 45 to 75 minutes, and maintained at 20.8 ± 0.7 kgf/cm ² or 215.7 ± 1.7 ° C for three hours, within 1.5 hours. 20.8 kgf/cm ^{2 is} reduced to less than 0.7 kgf/cm ² . After cooling, the square-shaped solid body is taken out for determination; some of the sandstones are selected from 250 g of 1.36 mm-size sandstone and sandstone of 1.18 mm. Preferably, 625 grams of gravel, 0.6 mm particle size sandstone is preferred.

In order to make the embodiments of the present invention more apparent to those skilled in the art, the specific embodiments of the present invention are described by way of example, but the scope of the invention is not limited by the embodiments.

"Embodiment 1"

Take 3500 g of sand and gravel at the site to carry out the phenolphthalein test procedure as described above. As shown in Table 1, after taking 250 g of the sample from the gravel and mixing it with 250 g of water, add 5 c.c. of the phenolphthalein reagent and stir. Uniform, it was confirmed by visual observation that the liquid did not change color, so it was judged that the measured sand was qualified and could be fed.

<<Example 2》

Take 3500 g of sand and gravel at the site to carry out the phenolphthalein test procedure as described above. As shown in Table 1, after taking 250 g of the sample from the gravel and mixing it with 250 g of water, add 5 c.c. of the phenolphthalein reagent and stir. Uniform, visually observed that the liquid turned red, followed by the pH acid-base test procedure as described above, the acid-base concentration meter was placed in the liquid, and waited for 3-5 minutes to confirm the pH value, and the obtained pH value was less than 10 Therefore, it is determined that the measured sand and gravel is qualified and can be fed.

Example 3

Take 3500 g of sand and gravel at the construction site. As shown in Table 1, carry out the phenolphthalein test procedure as described above. After taking 250 g of the sample from the gravel and mixing it with 250 g of water, add 5 c.c. of the phenolphthalein reagent and stir. Uniform, visually observed that the liquid turns red; then carry out the pH acid-base test procedure as described above, put the acid-base concentration meter into the liquid, wait for 3-5 minutes to confirm the pH value, and obtain the pH value greater than 10 Then, the magnetic attraction test step as described above is carried out, and another 200 g sample is placed in an oven to be baked to constant weight, and a ferrite magnet is used to approach the dried sample to confirm that no sample is taken after magnetization. Perform the "Sand composition analysis" as described above, and take 8 g of the dried sample into a component analyzer to confirm the percentage of the total amount of Ca in the sample and the percentage of the total amount of Si, and convert the Ca/Si value. Since the Ca/Si value is <0.2, it is determined that the measured sandstone is qualified and can be fed.

Example 4

Take 3500 g of sand and gravel at the construction site. As shown in Table 1, carry out the phenolphthalein test procedure as described above. After taking 250 g of the sample from the gravel and mixing it with 250 g of water, add 5c.c. of phenolphthalein reagent. Stir well, and visually observe that the liquid turns red; then carry out the pH acid-base test procedure as described above, put the acid-base concentration meter (pH meter) into the liquid, wait for 3-5 minutes to confirm the pH meter, and obtain The pH is greater than 10. Then, the magnetic attraction test step is performed as described above, and another 200 g sample is placed in an oven to be baked to a constant weight, and a ferrite magnet is used to approach the dried sample to confirm that any sample is magnetically picked up. As described above, "Sandstone Composition Analysis" and "Hot Compression Expansion Test", the test, both test results are all qualified, so it is judged that the measured sandstone is qualified and can be fed.

Table 1         <TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> </td><td> </td><td> Example 1 </td> <td> Example 2 </td><td> Example 3 </td><td> Example 4 </td></tr><tr><td> Phenolphthalein Test</td><td> Sample Weight (g) </td><td> 250 </td><td> 250 </td><td> 250 </td><td> 250 </td></tr><tr><td> Water (g) </td><td> 250 </td><td> 250 </td><td> 250 </td><td> 250 </td></tr><tr><td> 1% phenolphthalein (mL) </td><td> 5 </td><td> 5 </td><td> 5 </td><td> 5 </td></tr><tr>< Td> with or without color change</td><td> no</td><td> there is</td><td> there is</td><td> there is</td></tr><tr><td> pH determination</td><td> pH value</td><td> - </td><td> <10 </td><td> ≧10 </td><td> ≧10 </td ></tr><tr><td> Magnetic test</td><td> with or without reaction</td><td> - </td><td> - </td><td> no</td ><td> 有</td></tr><tr><td> Analysis of sandstone composition</td><td> Ca/Si value</td><td> - </td><td> - </td><td> <0.2 </td><td> <0.2 </td></tr><tr><td> Hot press expansion analysis</td><td> Number of blast holes</td ><td> - </td><td> - </td><td> - </td><td> <1 </td></tr><tr><td> Lattice determination</td><td> </td><td> qualified</td><td> qualified</td><td> qualified</td><td> qualified</td></tr>< /TBODY></TABLE>

The invention classifies different detection methods and detects and judges whether it is qualified or abnormal by a hierarchical method. Each step detects the sandstone in an effective manner to detect whether the furnace contains a furnace, and if the abnormality, the next one is performed. The step of detecting the determination, if it is qualified, does not need to perform other tests, and the present invention can quickly and conveniently screen whether the sand has a furnace.

Although the content of the present invention has been described in detail by way of examples as described above, the present invention is not limited to the embodiments. Therefore, the scope of protection to be covered in this case also includes the scope of the patent application described below and the scope defined by it.

In addition, the various patent documents and non-patent documents, including patent applications, publications, and publications, cited herein are hereby incorporated by reference in their entirety herein in their entirety herein, The scope of spirit and rights.

The present disclosure has been disclosed in the above embodiments, and is not intended to limit the scope of the disclosure, and the present invention may be practiced without departing from the spirit and scope of the invention. And the modifications; for example, the technical contents exemplified in the foregoing embodiments are combined or changed to become a new embodiment, and such embodiments are of course considered as belonging to the present invention. Therefore, the scope of protection of the present disclosure is subject to the definition of the scope of the appended claims.

S1‧‧‧Phenolphthalein test procedure

S2‧‧‧pH pH test procedure

S3‧‧‧Magnetic test procedure

S4‧‧‧ Component Analysis Procedure

S5‧‧‧ Component Analysis and Thermocompression Test Procedure

D1‧‧‧Determination of phenolphthalein test results

D2‧‧‧Determination of pH acid and alkali test results

D3‧‧‧Determination of component analysis results

D4‧‧‧ Component analysis and determination of thermocompression test results

D5‧‧‧ Component analysis and determination of thermocompression test results

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a typical test procedure of an embodiment of a sand and stone furnace quick screening test method according to the present invention.

S1‧‧‧Phenolphthalein test procedure

S2‧‧‧pH pH test procedure

S3‧‧‧Magnetic test procedure

S4‧‧‧ Component Analysis Procedure

S5‧‧‧ Component Analysis and Thermocompression Test Procedure

D1‧‧‧Determination of phenolphthalein test results

D2‧‧‧Determination of pH acid and alkali test results

D3‧‧‧Determination of component analysis results

D4‧‧‧ Component analysis and determination of thermocompression test results

D5‧‧‧ Component analysis and determination of thermocompression test results

Claims (10)

The utility model relates to a sand stone furnace quick screening detection method, which comprises the following steps: a phenolphthalein test step: mixing a plurality of sandstones with water to form a mixed liquid, and adding a phenolphthalein reagent to observe whether the mixed liquid is discolored, when the mixed liquid is not discolored, Determining the quality of the sandstone as qualified; pH acid-base test step: detecting the pH value of the mixed liquid in the phenolphthalein test step, and when the pH value of the mixed liquid is less than 10, the sandstone is The quality is judged as qualified; the magnetic test step: for the mixture in the pH acid-base test step, the pH value is greater than 10, the ferrite magnet is close to the sand stone and the magnetic attraction reaction is observed, and then, the magnetic reaction is not generated. The composition of the sand is analyzed, and when the result of the component analysis is no abnormality, the quality of the sand is judged as qualified; or, for the composition of the sand having the magnetic reaction, the composition analysis and the thermostatic expansion test are performed as components. When the results of the analysis and the thermocompression test are as follows, the quality of the sand is judged as qualified; when at least one of the results of the component analysis and the thermocompression test shows an abnormality I.e. it is determined that these gravel ballast contained in the furnace, whereas the quality of sand determined to be defective. The sand stone furnace quick screening test method as claimed in claim 1, wherein the mixing ratio of the sandstones to water in the phenolphthalein test step is 10:1 to 1:10. The sand stone furnace quick screening test method according to claim 1, wherein the weight percentage concentration of the phenolphthalein reagent in the phenolphthalein test step is 0.1% to 10%. The sand stone furnace quick screening test method as claimed in claim 1, wherein the pH acid and alkali test is performed by an acid-base concentration meter. The sand stone furnace quick screening test method as claimed in claim 1, wherein the magnetic testing step first removes the sand and gravel from the mixed liquid and dries to a constant weight. The sand stone furnace quick screening test method as claimed in claim 1, wherein the sand stone component analysis step is to determine a percentage of the total amount of calcium (Ca) elements and a total amount of cerium (Si) elements in the sand and gravel, and Calculating the ratio of the total percentage of the calcium element to the total percentage of the elemental element (Ca/Si), which is judged to be acceptable when the Ca/Si value is <0.2; otherwise, when the Ca/Si value is At 0.2, it is judged to be abnormal. The quick-sand test method for sand and gravel furnace as claimed in claim 1, wherein the hot-pressure expansion test is performed by forming a cylindrical body with an appropriate amount of cement, sand, and water, and heating at a suitable vapor pressure and temperature. After the time, it is cooled to room temperature; then, it is observed whether there is a cone-shaped blasting hole on the surface of the square cylindrical solid, and when the number of the blasting holes is <1 and the square column entity is not broken, it is judged as qualified; When the number of blast holes 1 or the occurrence of the square cylindrical solid fracture is judged to be abnormal. The sand stone furnace quick screening test method according to claim 7, wherein the vapor pressure is in the range of 20.1 to 21.5 kgf/cm ² ; and the temperature is in the range of 214.0 to 217.4 °C. The sand stone furnace quick screening test method as claimed in claim 7, wherein the sand stone has a particle diameter ranging from 0.6 mm to 2.5 mm. The sand stone furnace quick screening test method as claimed in claim 7, wherein the hot pressure expansion test is performed by gradually heating and increasing the pressure, and then cooling and cooling.