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Phosphorus removal and chromium protection double process for smelting chromium-containing high-phosphorus molten metal from laterite-nickel ore

A technology of laterite nickel ore and molten metal, applied in the field of iron and steel metallurgy, can solve the problems of deterioration of molten metal performance, waste of chromium resources, etc., and achieve the effects of good rhythm matching, simple process operation and high quality

Pending Publication Date: 2022-08-09
辽宁石源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem solved by the present invention is that in the smelting process of laterite nickel ore resources, in order to remove phosphorus or enrich nickel, phosphorus and chromium will be removed simultaneously, thereby causing waste of chromium resources; while in blast furnace smelting, iron, chromium, Nickel will be harvested together with the harmful element phosphorus. Although it will not cause waste of chromium resources, there is a defect that high phosphorus content will deteriorate the performance of the molten metal.

Method used

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  • Phosphorus removal and chromium protection double process for smelting chromium-containing high-phosphorus molten metal from laterite-nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Blast furnace produces chromium -containing high phosphorus and iron water pre -treatment.

[0043] 60 tons of iron water smelted by blast furnaces, see Table 1 when the iron is ranged. The phosphorus content is 0.094 %, and the chromium content is 4.32 %.

[0044] The high silicon containing this iron water will cause the temperature to rise quickly when AOD blows. Even if chromium is lost during blowing, it is difficult to effectively remove the phosphorus.

[0045] The method of removing chromium -to -chrome -keeping dual process is:

[0046] S1, first determine the final content of chromium -containing high phosphorus iron water after dehydration

[0047] In order to reduce the loss of chromium in the subsequent AOD blowing process, such as figure 1 It is shown that when the blast furnace is used, the dual pre -phosphorus treatment process of the top residue and the chloropphorcin core wire in the iron bag is used.

[0048] S2. Determine the final content of the top res...

Embodiment 2

[0059] AOD produces the treatment of steel and water phosphorus in nickel stainless steel.

[0060] AOD steel water is 60 tons, and the phosphorus is exceeded in LF. The composition is shown in Table 2. The phosphorus content is 0.07 %, and the chromium content is 16.3 %.

[0061] The method of removing chromium -to -chrome -keeping dual process is:

[0062] S1. First determine the final content of the phosphorus after the steel -containing steel -containing steel -containing steel -containing steel water water water

[0063] Obviously, the difference between 0.05 % from the standard for the standard is not very large, which is equivalent to 0.2kg of phosphorus per ton of steel. Therefore, the dual dehydration process of the top residue and the chloropphorcin core wire is adopted in the LF.

[0064] S2. Determine the final content of the top residue and the chip phosphoring core wire according to the final content of the steel in the nickel -containing steel stainless steel.

[00...

Embodiment 3

[0075] AOD produces high -end nickel -chromium alloy steel in the process of excessive steel and phosphorus.

[0076] AOD steel water is 60 tons, and the phosphorus is exceeded in LF. The composition is shown in Table 3. The phosphorus content is 0.07 %, and the chromium content is 2.10 %.

[0077] The method of removing chromium -to -chrome -keeping dual process is:

[0078] S1, first determine the final content of high -end nickel -chromium alloy steel in the steel water water in the steel

[0079] High -end nickel -chromium alloy steel requires ultra -low -low phosphate content, and the phosphorus content should be less than 0.02 %. Therefore, the dual dehydration process of top residue and dehydration core wire is adopted in LF. The thickness of the top residue and the length of the dehydrated phosphorus core line is high, and the content of alkaline metal compounds is also high.

[0080] S2. Determine the final content of the top residue and the chloropphorcin core wire accor...

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Abstract

The invention discloses a dephosphorization and chromium-retaining double process for smelting chromium-containing high-phosphorus molten metal from laterite-nickel ore, and belongs to the technical field of ferrous metallurgy. The dephosphorization and chromium-retaining double process method comprises the following steps: adding additives, namely dephosphorization core-spun yarns and top slag, which can enable the generation free energy of P2O5 to be lower than the generation free energy of Cr2O3 into the interior and the surface of chromium-containing high-phosphorus molten metal for laterite-nickel ore smelting respectively; the chromium and the phosphorus inside and on the surface of the laterite-nickel ore smelting chromium-containing high-phosphorus molten metal are selectively oxidized; wherein the chromium is retained in the molten metal, phosphorus oxide generated in the molten metal floats upwards into the top slag, and phosphorus oxide generated on the surface layer of the molten metal is directly retained in the top slag. The method has the beneficial effects that the comprehensive utilization value of the laterite-nickel ore is high, the quality of stainless steel and alloy steel is high, the technological operation is simple and convenient, the rhythm matching performance is good, multi-link dephosphorization is achieved, slag system resources are rich and non-toxic, the phosphorus content can be reduced to 0.05% or below, and the chromium retention rate is 84% or above.

Description

Technical field [0001] The present invention is a technical field of steel metallurgy, involving a dehuminating chromium -to -chrome -saving duality of chromium nickel ore metalluria. Background technique [0002] At present, a conventional way dehydration is performed under the conditions of the iron water at the atmosphere of oxidation, which will inevitably lead to the simultaneous removal of chromium in the iron water, causing a waste of chromium. [0003] This is due to the similarity of phosphorus and chromium oxidation and reduction thermodynamic conditions in iron water, that is, under the conditions of 1350-1500 ° C, the thermodynamic conditions of phosphorus and chromium oxidation reduction are similar. Of course, in the restore state of the metal solution, the phosphorus when chromium enters the metal solution is also accompanied by the metal liquid, which will cause the metal liquid quality to worsen. In particular, the red earthy mineral smelting refined chromium -co...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/072
CPCC21C7/0056C21C7/064C21C7/0645C21C7/072Y02P10/20
Inventor 王平赵庆升赵永璞
Owner 辽宁石源科技有限公司
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