Preservative for refractory material binding agent and use method of preservative

Abstract

The invention belongs to the technical field of refractory material additives, and particularly discloses a preservative for a refractory material binding agent and a use method of the preservative. The preservative for the refractory material binding agent is mainly composed of 40-60% of benzoic acid, 35-55% of citric acid and 1-5% of sodium carboxymethyl cellulose. The use method comprises the following steps: weighing various raw materials in the preservative, and uniformly mixing to obtain preservative mixed powder; and adding the obtained preservative mixed powder into the binding agent solution, and uniformly mixing to obtain the binding agent for the refractory material. The preservative is added into a binding agent dextrin solution, so that the normal-temperature storage time of the dextrin solution can be effectively prolonged, and the performance of the dextrin solution is kept; in addition, the stability of the dextrin solution is remarkably improved, and the bonding performance is improved, so that the defect that the dextrin solution serving as a bonding agent is used in a refractory material and cracks or even cracks occur in the drying process of green bricks can be overcome.

Description

1. Technical field:

[0001] The invention belongs to the technical field of refractory material additives, and in particular relates to a preservative for a refractory material binder and a use method thereof. 2. Background technology:

[0002] At present, the solution formed by dissolving dextrin powder binder can be used in the production of refractory products to combine mud materials to form high-strength bonded bodies. However, pure dextrin solution is prone to fermentation in high-temperature environments, generating a large amount of gas. When using small presses such as vibration presses to form special-shaped high-alumina bricks, clay bricks, corundum bricks, dry quenched mullite bricks and mullite silicon carbide bricks for blast furnaces, the body molding pressure is low, and the density and bonding force of the bricks are insufficient to resist the violent expansion of the gas generated by the fermentation of the solution, resulting in cracks or even ruptures in the drying process of the bricks, which limits its application in the refractory industry.

[0003] In a suitable high temperature environment, yeast can multiply in large quantities by using the supply of sugar and corresponding nutrients in the dextrin solution, and the sugar is gradually consumed, while releasing alcohol and carbon dioxide. In fact, this is the fermentation process. In simple terms, yeast converts the dextrin solution into alcohol and carbon dioxide: C6H 12 O6 (glucose) → 2C2H5OH (ethanol) + 2CO2↑ (the necessary condition is enzyme, i.e. yeast). 3. Summary of the invention:

[0004] The technical problem to be solved by the present invention is: according to the defects of cracks or even ruptures in the drying process of the bricks when the dextrin solution is used as a binder in the refractory material, the present invention provides a preservative for the binder of the refractory material and a method of using the same. Adding the preservative of the present invention to the binder dextrin solution can effectively prolong the room temperature storage time of the dextrin solution and maintain the performance of the dextrin solution; and significantly improve the stability of the dextrin solution and improve the bonding performance, thereby avoiding the defects of cracks or even ruptures in the drying process of the bricks when the dextrin solution is used as a binder in the refractory material.

[0005] In order to solve the above problems, the technical solution adopted by the present invention is:

[0006] The invention provides a preservative for refractory binder, which is mainly composed of 40-60% of benzoic acid, 35-55% of citric acid and 1-5% of sodium carboxymethyl cellulose, expressed in terms of mass percentage.

[0007] According to the above-mentioned preservative for refractory binder, the preservative is mainly composed of 45-60% of benzoic acid, 38-50% of citric acid and 2-5% of sodium carboxymethyl cellulose.

[0008] According to the above-mentioned preservative for refractory binder, the purity of the benzoic acid, citric acid and sodium carboxymethyl cellulose are all greater than 99%.

[0009] In addition, a method for using the above-mentioned preservative in a binder is provided, the method comprising the following steps:

[0010] a. First, weigh various raw materials according to the raw material ratio of the above preservatives;

[0011] b. Evenly mix the weighed benzoic acid, citric acid and sodium carboxymethyl cellulose to obtain a preservative mixed powder;

[0012] c. Add the obtained preservative mixed powder into the binder solution and mix evenly to obtain a binder for refractory materials.

[0013] According to the above-mentioned method for using the preservative in the binder, when the preservative mixed powder is added to the binder and mixed evenly in step b, the preservative mixed powder accounts for 0.15-0.3% of the weight of the binder.

[0014] According to the above-mentioned method for using a preservative in a binder, the binder in step c is a dextrin solution.

[0015] Adding the preservative of the present invention to the binder dextrin solution can make the dextrin solution have a better antiseptic effect (antiseptic time in high temperature environment in summer> 30 days). In the preservative ingredients of the present invention, the benzoic acid used can inhibit the reproduction of some microorganisms (including bacteria, fungi and yeast, etc.). Because benzoic acid can penetrate the cell membrane of microorganisms, prevent the normal metabolism and reproduction of intracellular substances, thereby inhibiting the growth of microorganisms, benzoic acid can combine with water to form benzoate, prevent the contamination and breeding of microorganisms, thereby preventing the deterioration and corruption of articles; citric acid is added because benzoic acid has the best antiseptic effect in a solution with a pH value of 4; adding sodium carboxymethyl cellulose allows benzoic acid and citric acid to form a uniform suspension in the binder solution, improving the uniformity of dissolution.

[0016] The positive beneficial effects of the present invention are:

[0017] 1. Adding the preservative of the present invention into the binder dextrin solution can effectively prolong the storage time of the dextrin solution at room temperature and maintain the performance of the dextrin solution.

[0018] 2. The preservative of the present invention is combined by specific raw materials and applied to a dextrin solution, which significantly improves the stability of the dextrin solution and improves the bonding performance.

[0019] 3. Compared with the existing dextrin solution, the dextrin solution with the preservative of the present invention not only improves the comprehensive performance of the dextrin solution, but also reduces the application cost.

[0020] 4. The preservative of the present invention can make the dextrin solution have higher temperature resistance, can withstand temperatures as high as 60 to 70° C. without performance degradation, and is suitable for use in harsh environments.

[0021] 5. Adding the preservative of the present invention to the dextrin solution makes it easier to mix evenly when used, without precipitation, easy to bond the blank, and has a smooth surface after drying without cracks caused by solution fermentation.

[0022] 6. The preservative of the present invention is applied to dextrin solution, so that the dextrin solution has high temperature stability and construction convenience, and has broad application prospects in the industrial field.

[0023] 7. After using the dextrin solution with preservatives added, the breakage rate of the formed refractory body due to binder fermentation is directly reduced from the highest 100% to 0%.

[0024] In summary, adding the preservative of the present invention to the binder dextrin solution can effectively prolong the storage time of the dextrin solution at room temperature and maintain the performance of the dextrin solution; and significantly improve the stability of the dextrin solution and improve the bonding performance, thereby avoiding the defect of cracks or even breakage of bricks in the drying process when the dextrin solution is used as a binder in refractory materials. 4. Specific implementation methods:

[0025] The present invention is further described below in conjunction with embodiments, but the protection scope of the technical solution of the present invention is not limited thereto.

[0026] Embodiment 1:

[0027] The preservative for refractory binder of the present invention is composed of 50% of benzoic acid, 49% of citric acid and 1% of sodium carboxymethyl cellulose, expressed by mass percentage.

[0028] Embodiment 2:

[0029] The method for using the preservative in the binder according to Example 1 of the present invention has the following detailed steps:

[0030] a. First, various raw materials are weighed according to the raw material ratio of the preservative described in Example 1;

[0031] b. Evenly mix the weighed benzoic acid, citric acid and sodium carboxymethyl cellulose to obtain a preservative mixed powder;

[0032] c. Add the obtained preservative mixed powder into the binder dextrin solution and mix (the preservative mixed powder accounts for 0.15% of the weight of the binder dextrin solution) for 40 minutes. After mixing evenly, a binder for refractory materials is obtained.

[0033] The refractory binder prepared by Example 2 of the present invention is used to produce special-shaped mullite bricks for dry quenching coke ovens. The surface of the blank after forming is smooth and crack-free. After entering the dryer and being dried at 50-60°C for 72 hours, the bricks do not have cracks and have no fermented sour smell. There is no difference in the appearance of the product after firing, and there is no difference in the test results. The relevant performance test data are shown in Table 1.

[0034] Table 1 Comparison of relevant performance test data of the refractory dextrin solution prepared in Example 2 before and after adding preservatives

[0035]

[0036] Embodiment 3:

[0037] The preservative for refractory binder of the present invention consists of 55% of benzoic acid, 43% of citric acid and 2% of sodium carboxymethyl cellulose, expressed by mass percentage.

[0038] Embodiment 4:

[0039] The method for using the preservative in the binder according to Example 3 of the present invention has the following detailed steps:

[0040] a. First, various raw materials are weighed according to the raw material ratio of the preservative described in Example 3;

[0041] b. Evenly mix the weighed benzoic acid, citric acid and sodium carboxymethyl cellulose to obtain a preservative mixed powder;

[0042] c. Add the obtained preservative mixed powder into the binder dextrin solution and mix (the preservative mixed powder accounts for 0.20% of the weight of the binder dextrin solution) for 45 minutes. After mixing evenly, a binder for refractory materials is obtained.

[0043] The refractory binder prepared by Example 4 is used to produce special-shaped corundum-mullite bricks for blast furnaces. The surface of the formed bricks is smooth and crack-free. After entering the dryer and drying at 50-60°C for 72 hours, the bricks do not crack and have no fermented sour smell. There is no difference in the appearance of the products after firing, and there is no difference in the test results. The relevant performance test data are shown in Table 2.

[0044] Table 2 Comparison of relevant performance test data of the refractory dextrin solution prepared in Example 4 before and after adding preservatives

[0045]

[0046] Embodiment 5:

[0047] The preservative for refractory binder of the present invention is composed of 45% of benzoic acid, 53% of citric acid and 2% of sodium carboxymethyl cellulose, expressed by mass percentage.

[0048] Embodiment 6:

[0049] The method for using the preservative in the binder according to Example 5 of the present invention has the following detailed steps:

[0050] a. First, various raw materials are weighed according to the raw material ratio of the preservative described in Example 5;

[0051] b. Evenly mix the weighed benzoic acid, citric acid and sodium carboxymethyl cellulose to obtain a preservative mixed powder;

[0052] c. Add the obtained preservative mixed powder into the binder dextrin solution and mix (the preservative mixed powder accounts for 0.20% of the weight of the binder dextrin solution) for 35 minutes. After mixing evenly, a binder for refractory materials is obtained.

[0053] The refractory binder prepared by Example 6 is used to produce special-shaped high-alumina bricks for blast furnaces. The surface of the formed bricks is smooth and crack-free. After entering the dryer and drying at 50-60°C for 72 hours, the bricks do not crack and have no fermented sour smell. There is no difference in the appearance of the products after firing, and there is no difference in the test results. The relevant performance test data are detailed in Table 3.

[0054] Table 3 Comparison of relevant performance test data of the refractory dextrin solution prepared in Example 6 before and after adding preservatives

[0055]

Claims

1. A preservative for a refractory binder, characterized in that: Expressed in terms of mass percentage, the preservative is mainly composed of 40-60% benzoic acid, 35-55% citric acid and 1-5% sodium carboxymethyl cellulose.

2. The antiseptic for refractory binder according to claim 1, characterized in that: The preservative mainly consists of 45-60% of benzoic acid, 38-50% of citric acid and 2-5% of sodium carboxymethyl cellulose.

3. The preservative raw material for refractory binder according to claim 1, characterized in that: The purity of the benzoic acid, citric acid and sodium carboxymethyl cellulose is all greater than 99%.

4. A method for using the preservative according to claim 1 in a binder, characterized in that: The method of use comprises the following steps: a. First, weigh various raw materials according to the raw material ratio of the preservative according to claim 1; b. Evenly mix the weighed benzoic acid, citric acid and sodium carboxymethyl cellulose to obtain a preservative mixed powder; c. Add the obtained preservative mixed powder into the binder solution and mix evenly to obtain a binder for refractory materials.

5. The method for using a preservative in a binder according to claim 4, characterized in that: When the preservative mixed powder is added to the binder and mixed evenly in step b, the preservative mixed powder accounts for 0.15-0.3% of the weight of the binder.

6. The method for using a preservative in a binder according to claim 4, characterized in that: The binding agent in step c is a dextrin solution.

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