TWI555587B - A method of solving the expansion of reductive slag - Google Patents

Description

Solving the method of reducing enthalpy expansion

The invention relates to a reducing hydrazine resource, in particular to a method for solving the reduction enthalpy expansion.

The electric arc furnace furnace is a product produced by steelmaking in a conventional electric arc furnace steelmaking equipment, and the electric arc furnace steelmaking equipment is mainly composed of a graphite electrode, a furnace cover and a furnace body, wherein the graphite electrode is used for accessing The electric current generates an electric arc, and the high-temperature molten scrap material of 1600 degrees or more generated by the electric arc is used for the purpose of steel making.

In the general arc furnace steelmaking process, it can be divided into three stages: dissolution period, oxidation period and reduction period; among them, when molten steel dissolves to form liquid molten steel (ie, dissolution period), impurities are oxidized into The gaseous oxide or the molten oxide is floated, and then the high-pressure oxygen is introduced to accelerate the oxidation rate (ie, the oxidation period), so that the impurities in the molten steel are oxidized and precipitated to form cerium oxide, and finally added to the molten steel. The reducing agent such as antimony ore, ferromanganese, coke and quicklime controls the quality of the molten steel (ie, the reduction period) to avoid the excessive oxidation of oxygen in the oxidation period to accelerate the oxidation rate, resulting in deterioration of the quality of the molten steel; In the steel process, the floating raft is deoxidized by desulfurization of the molten steel, so the additives of the electric arc furnace process such as carbon, phosphorus and smelting ore are oxidized into various oxides (SiO2, CaO, MnO, MgO, FeO), to form a reduction raft floating on the surface of the molten steel.

Continuing with the above, most electric arc furnace steel mills do not separate storage for yttrium oxide and reduced yttrium, and most of them are used for engineering landfill materials, mainly due to the reduction of lanthanum. It contains a high amount of calcium oxide, which causes the electric arc furnace furnace containing the reduced antimony component to be used for landfilling, which may cause expansion, which leads to the lack of deformation of the subgrade structure, and causes the recycling mechanism to deal with the reduction and treatment of the reduction crucible. Difficulties affect the scope of subsequent resource reuse.

Furthermore, at present, the relative research on the reduction of antimony in electric arc furnaces at home and abroad mainly focuses on the coagulation compressive strength after use, and there are few studies on the expansion ratio after reduction of antimony, such as the regulation of CNS 15286 in Taiwan. The pre-expansion rate of the electric arc furnace slag is set to be less than 0.8%. Accordingly, Taiwan still adopts a reservation attitude toward the subsequent resource utilization of the reduced antimony. Therefore, how to overcome the problem of the health expansion of the reduction crucible is an urgent solution.

Accordingly, it is an object of the present invention to provide a method for solving the reduction enthalpy expansion which is more robust to the reduction and which effectively reduces the volume expansion after use.

Therefore, the present invention solves the method for reducing the expansion of bismuth, which mainly selects a reduced cerium powder having a fineness of 3000 to 6000 cm ² /g (that is, a preparation step), and then in the mixing step, the aforementioned reduced cerium powder and the same The alkaline agent is mixed, and the ratio of the added bismuth powder to the alkaline agent is 1:1~2 (ie, the mixing step), so that the problem of the swellability of the reduced bismuth powder can be effectively improved, and the subsequent reduction of bismuth powder is promoted. The upper hardness is better and more stable, so as to increase the use range of the subsequent reduction of the reduced tantalum powder.

3‧‧‧Resolving methods for reducing swell

31‧‧‧Material preparation steps

32‧‧‧Mixed steps

1 is a block diagram of a preferred embodiment of the present invention.

Figure 2 is a graph of experimental data in a preferred embodiment of the invention.

【annex】

Annex 1, a photograph of the actual experimental results of Experimental Example 1.

Attachment 2, a photograph of the actual experimental results of Experimental Example 2.

Attachment 3, a photograph of the actual experimental results of Experimental Example 3.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Referring to Figure 1, in a preferred embodiment of the present invention, the method 3 for solving the reduction enthalpy expansion includes a preparation step 31 and a mixing step 32. The preparation step 31 mainly uses the reduction produced by the electric arc furnace steelmaking process. The slag, and the reduced slag is subjected to preliminary treatment, and the reduced cerium powder having a fineness of 3000 to 6000 cm ² /g is selected.

Continuing the foregoing, the mixing step 32 of the embodiment has a The alkaline agent, the alkaline agent has a water content of 55% to 70%, and the alkaline agent may be sodium citrate or may be a mixture of sodium citrate and sodium hydroxide, and the reduced hydrazine and the alkaline agent The addition ratio is 1:1~2, so that the reduced ruthenium is mixed with the alkaline agent to prepare a slurry.

In the embodiment, the slurry is firstly applied on the basis of the slurry, and then mixed with sand after subsequent use to form a mortar, so that the mortar is added to the mortar due to the addition of the alkaline agent (K ₂ O+ The Na ₂ O) content is more than 0.6% or more.

In order to confirm the present invention, it is true that the robustness of the reduced cerium powder can be stably used, and in particular, several experimental examples are taken as an example. In the following experimental examples, in order to enable the reduction ruthenium to be fully utilized, the selection of the reducing ruthenium, The system is subjected to drying, screening (#4 screen), grinding treatment, and pre-treatment method of reducing cerium powder obtained by #100 screen, for additional testing in different proportions of subsequent different examples.

Referring to FIG. 2, in the following experimental example, the first experimental example: the amount of the reduced hydrazine and the alkaline agent added are 300 g (g) and 347.7 g (g), respectively, so the reduced hydrazine and the addition of the alkaline agent are added. The ratio is 1:1.16; as for the second experimental example, the addition amount of the reducing slag and the alkaline agent are 300 g (g) and 435.5 g (g), respectively, so the addition ratio of the reducing slag to the alkaline agent is 1:1.45: and the third experimental example: the amount of the reduced hydrazine and the alkaline agent added are 300 g (g) and 231.8 g (g), respectively, so the ratio of addition of the reduced hydrazine to the alkaline agent is 1: 0.77 and the reduced ruthenium is mixed with the alkaline agent to exhibit a slurry state, and after the slurry is solidified and tested by a thermocompression expansion test, the results are shown in the following table:

Therefore, as shown in the above table, in the first experimental example, when the ratio of the reducing slag to the alkaline agent is 1:1.16, after the test is carried out by the pressure expansion test method, the expansion amount is only 0.35%. In accordance with the provisions of CNS 15286, the amount of expansion must be less than 0.8; and in the second example, when the ratio of reducing slag to alkaline agent is 1:1.45, when it is to be solidified, the test is carried out by the pressure expansion test method. The expansion amount is only 0.24%, which is also in accordance with the provisions of CNS 15286, and the expansion amount must be below 0.8; and in the third experiment, when the ratio of reducing slag to alkaline agent is 1:0.77, it is used after solidification. When the test is carried out by the hot pressure expansion test method, the test result is expansion cracking; therefore, it can be confirmed that the addition ratio of the reduced ruthenium to the alkaline agent is in the range of 1:1 to 2, which will make the reduction slag healthy. It is stable and more in line with the specification of the expansion amount of 0.8 or less as specified in CNS 15286. Therefore, after the method of the present invention, the robustness of the reduced slag is surely stabilized, and the subsequent use of the reduced cerium powder is increased.

In summary, the present invention solves the method for reducing the expansion of bismuth. The mixing step mixes the reduced hydrazine with an alkaline agent, and the ratio of the added hydrazine to the alkaline agent is 1:1~2; The ratio of the addition of the alkaline agent to the alkaline agent is 1:1~2; that is, by adopting the addition ratio of the above-mentioned alkaline agent and reducing ruthenium, the health of the reduced ruthenium can be stabilized and stabilized. Stable, effectively reducing the volume expansion of the reduced ruthenium, and promoting the subsequent use of the reduced ruthenium for a wider range of uses.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

3‧‧‧Resolving methods for reducing swell

31‧‧‧Material preparation steps

32‧‧‧Mixed steps

Claims (4)

A method for solving the reduction enthalpy expansion comprises: a preparation step of selecting a reduced strontium powder having a fineness of 3000 to 6000 cm ² /g; and a mixing step of preparing an alkaline agent for the alkaline agent and the The reduced tantalum powder is mixed, and the ratio of the reduced tantalum powder to the alkaline agent is 1:1~2. The method for reducing the expansion of bismuth is described in the first aspect of the patent application, wherein the alkaline agent is sodium citrate. The method for solving the reduction enthalpy expansion according to the first aspect of the patent application, wherein the alkaline agent is a mixture of sodium citrate and sodium hydroxide. The method for solving the reduction enthalpy expansion according to the first or second item or the third item of the patent application scope, wherein the alkaline agent has a water content of 50% to 70%.