高炉用耐火材料抗渣性试验方法

1 范围

  本标准规定了高炉用耐火材料抗渣性试验方法的试验原理、试验设备、试验条件和步骤,结果计算及试验报告。

  本标准适用于测定高炉用耐火材料的抗渣性。

2 引用标准

  GB 8170-87 数字修约规则。

3 定义

  本标准采用下列定义。

  炉渣溶蚀率:一定形状、大小的试样,置于1490℃±10℃的高炉炉渣中,并在氮气搅动下,经40 min作用后被炉渣溶蚀的重量百分数。

4 原理

  耐火材料试样在流动的高炉渣中,经一定时间后,测定试样试验前后的重量变化率

5 仪器设备

5.1 抗渣性试验装置示意图如图1。

表1 炉渣成分
CaO/SiO2	Al2O3%	MgO%	MnO%	Fe2O3%
1.05±0.01	11.0±0.5	10.0±0.5	0.5±0.5	0.30~1.00

 

  1-温度控制仪; 2铂-铑热电偶; 3-硅钼棒; 4-平衡重锤;5-通气软管;6-支架;7-流址汁;8-氨气瓶;9-刚玉连接管;10-刚玉坩埚;11-试样;12-炉渣;13 -刚玉管

  图1 抗渣性试验装置示意图

5.2试验炉:以硅钼棒为发热元件,使用温度1600℃。

5.3温度控制仪精度:±5℃。

5.4炉膛直径 100 mm,恒温区高度250mm,温度波动范围±10℃。

5.5天平:最大称量2000 g,精度0.05g。

5.6氨气:纯度为99.95%。

5.7转子流量计:满足6.3.4的要求。

5.8游标卡尺:测量范围为0~200 mm,精度0.02 mm。

5.9干燥箱:温度范围为0~300℃。

5.10刚玉坩埚:内径不小于64mm,高度不小于120 mm.

5.11刚玉连接管:外径$l0 mm,长200 mm.

6 试验条件和步骤

6.1试样制备从制品上制取直径 30.0±1.0 mm,高 40.0±1.0 mm 的圆体试样两个,试样轴线与试样两端面保持垂直,并在中心钻孔,尺寸如图2所示。在 110±5℃下烘干备用。

6.2 试验用炉渣的配制

  试验用炉渣应附合表1规定或由委托方提供。

6.3试验步骤

6.3.1按5.5规定的天平,准确称量试样原重,作好记录,然后与刚玉管和吊杆用磷酸泥浆粘接牢固。如图3所示。将有泥浆粘接的部位放在电炉上烤干,不得有气之处。吊杆长度需测量准确,总长度应使试样挂在高温炉上部的支架上,试样插入熔渣中距坩埚底20 mm。

  图3 试样与吊杆联接图

6.3.2 炉清破碎至5 mm 以下,称取约850±50g的炉渣,经110±5℃烘烤2h冷却至室温。将装满炉渣的坩埚置于炉膛中心高温区,未装完的炉渣在熔化过程中逐渐加入,然后盖上炉盖。

6.3.3 送电升温,300℃以下升温速率不得大于10℃/min,以后逐渐升温到1490℃±10℃,自动恒温待全部炉渣熔化后保温 10 min。

6.3.4 试样放置

  先将试样在氦气保护下放入高温炉中的坩埚上方烘烤,当试样温度接近熔渣温度时,调整氮气流坐到 0.8L/min~1.0 L/min,然后将试样放入熔渣中,悬挂在固定支架下,开始计时,试验 40 min 取出试样,在水中冷却,结束试验

6.3.5 试验后试样处理

  冷却后的干燥试样,将其表面粘结的炉渣清除干净,然后按5.5规定的天平准确称量试验后的重量,作好记录。

7 试验结果计算和评定

7.1 试验结果计算

  溶蚀率计算公式如下:

  式中:W1–试样试验前的重量,g:

  W2–试样试验后的重量,8:

  R–溶蚀率,%。

7.2 试验结果评定

  同种耐火材料作两次试验,以单值和算术平均值作为试验结果。计算至小数点后一位,所取位数后的数字,按 GB 8170 的规定进行处理。

8 试验报告

  试验报告应包括:

  a)委托单位;

  b)试样名称及编号;

  c)渣样来源及成分;

  d)试验结果;

  e)试验单位;

  f)试验人员、审核及签发人;

  g)试验日期。

 

 

 

Test method for corrosion resistance ofblast furnace refractories to molten slag

1 Range

  This standard specifies the test principle, test equipment, test conditions and steps of the slag resistance test method of refractories used in blast furnaces, the result calculation and the test report.

  This standard is applicable to the determination of slag resistance of refractories used in blast furnaces.

2 Reference Standards

  GB 8170-87 Digital Modification rules.

3 Definition

  This standard uses the following definitions.

  Slag dissolution rate: A sample of a certain shape and size, placed in the blast furnace slag at 1490°C ±10°C, and stirred by nitrogen, after 40 minutes of the weight percentage of the slag dissolution.

4 Principles

  After a certain period of time, the weight change rate of the refractory sample before and after the test was measured in the flowing blast-furnace slag

5 Instruments and Equipment

5.1 The schematic diagram of the slag resistance test device is shown in Figure 1.

Table 1 Composition of slag
CaO/SiO2	Al2O3%	MgO%	MnO%	Fe2O3%
1.05±0.01	11.0±0.5	10.0±0.5	0.5±0.5	0.30~1.00

 

  1- Temperature controller; 2 platinum-rhodium thermocouple; 3-silicon molybdenum rod; 4- Counterweight; 5- Ventilation hose; 6- Support; 7- Streaming juice; 8-ammonia gas bottle; 9- corundum connection pipe; 10- corundum crucible; 11- sample; 12- Furnace slag; 13 – Corundum tube

  FIG. 1 Schematic diagram of slag resistance test device

5.2 Test furnace: silicon molybdenum rod as heating element, operating temperature 1600℃.

5.3 Accuracy of temperature controller :±5℃.

5.4 The diameter of the furnace is 100 mm, the height of the constant temperature zone is 250mm, and the temperature fluctuation range is ±10℃.

5.5 Balance: maximum weighing 2000g, accuracy 0.05g.

5.6 Ammonia: purity is 99.95%.

5.7 Rotameter: Meet the requirements of 6.3.4.

5.8 Vernier caliper: Measuring range is 0~200 mm, accuracy is 0.02 mm.

5.9 Drying oven: The temperature ranges from 0 to 300 ° C.

5.10 Corundum crucible: inner diameter is not less than 64mm, height is not less than 120mm.

5.11 Corundum connection pipe: Outer diameter $l0 mm, length 200 mm.

6 Test conditions and procedures

6.1 Sample preparation Two round samples with a diameter of 30.0± 1.0mm and a height of 40.0± 1.0mm were made from the product. The axis of the sample was kept perpendicular to the two ends of the sample, and holes were drilled in the center, as shown in Figure 2. Dry at 110±5℃.

6.2 Preparation of slag for test

  Test slag shall be attached to Table 1 or supplied by the client.

6.3 Test Procedure

6.3.1 Accurately weigh the raw weight of the sample according to the balance specified in 5.5, make a record, and then firmly bond the corundum pipe and boom with phosphoric acid mud. As shown in Figure 3. Place the parts with mud bonding on the electric oven to dry, and there shall be no gas. The length of the boom should be measured accurately, and the total length should be so that the sample is hung on the support at the upper part of the high-temperature furnace, and the sample is inserted into the slag 20 mm away from the bottom of the crucible.

  图3 试样与吊杆联接图

6.3.2 The furnace clean is broken to less than 5 mm, weigh about 850±50g of slag, bake at 110±5℃ for 2h and cool to room temperature. The crucible filled with slag is placed in the high temperature zone in the center of the furnace, and the unfinished slag is gradually added during the melting process, and then the furnace cover is covered.

6.3.3 Heating by power supply, the heating rate below 300℃ shall not be greater than 10℃/min, and then gradually rise to 1490℃±10℃, and the automatic constant temperature shall be kept for 10 minutes after all the slag is melted.

6.3.4 Specimen placement

  First, the sample is placed under the protection of helium gas and baked above the crucible in the high temperature furnace. When the temperature of the sample is close to the temperature of the molten slag, the nitrogen flow is adjusted to 0.8L/min~ 1.0L /min, and then the sample is placed in the molten slag and suspended under the fixed support. The timing starts

6.3.5 Sample treatment after test

  After cooling, the dry sample shall be cleaned of the slag bonded on its surface, and then the weight after the test shall be accurately weighed according to the balance specified in 5.5, and the record shall be made.

7 Calculation and evaluation of test results

7.1 Calculation of test results

  The dissolution rate is calculated as follows:

  In the equation :

  W1– the weight of the sample before the test,g:

  W2– Weight of sample after test,g:

  R– dissolution rate,%.

7.2 Evaluation of test results

The same refractory material is tested twice, and the single value and the arithmetic mean value are taken as the test results. Calculated to one decimal place, the number after the digit taken is processed according to GB 8170.

8 Test report

  The test report shall include:

  a) the entrusting unit;

  b) Sample name and number;

  c) Source and composition of slag sample;

  d) Test results;

  e) Test unit;

  f) test personnel, auditor and issuer;

  g) Trial date.