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A method for smelting tungsten-molybdenum ferroalloy using low-grade tungsten-molybdenum ore

A low-grade tungsten-molybdenum ore technology is applied in the field of resource utilization of low-grade tungsten-molybdenum ore, which can solve problems such as difficult smelting of low-grade tungsten-molybdenum ore, and achieve the effects of improving reduction efficiency, good reduction effect and reducing reaction resistance.

Active Publication Date: 2019-07-30
MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process is difficult to be used in the smelting of low-grade tungsten-molybdenum ore

Method used

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  • A method for smelting tungsten-molybdenum ferroalloy using low-grade tungsten-molybdenum ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The composite reducing agent adopted in the present invention includes modified silicon carbide, modified quartz and additives; the modified silicon carbide is a mixture of silicon carbide powder and silicon powder, and the modified quartz is coated with The quartz coating component, the coating component is pitch; the coating component and quartz are mixed and stirred at a temperature of 50-90°C to obtain modified quartz, wherein the mass ratio of the quartz to the coating component of the modified quartz is 6 -7:1, this embodiment is 7:1.

[0039] That is, first add quartz into the reaction kettle to raise the temperature to 40-50°C, keep it warm for 20 minutes, and then raise the temperature to 50-90°C, which is 60°C in this example; then add the asphalt powder into the reaction kettle, and coat the asphalt powder on Modified quartz was obtained on the surface of the quartz and kept warm for 10 minutes.

[0040] Modified silicon carbide Add kaolin to silicon carbide...

Embodiment 2

[0090] The basic content of this example is the same as that of Example 1, except that the additives also include plastic powder and biomass, and the mass ratio of coke powder, plastic powder and biomass is 5:2:2. Soak the biomass and biomass in the alkaline solution of NaOH and NaCl at 60-80°C, and dry after soaking; after drying, stir the coke powder, plastic powder and biomass at 150-250°C Mixing, so that the plastic powder and biomass and coke powder adhere together, wherein the particles of the plastic powder and biomass are less than 250 mesh. The plastic powder is any one or a mixture of polyethylene, polyoxymethylene, polyamide, polypropylene, polystyrene, polycarbonate, polymethyl methacrylate and polyester. The plastic powder in this embodiment is polypropylene, polystyrene, polycarbonate; the mass ratio of polypropylene, polystyrene, polycarbonate is: 3:1:2. CO and H produced by decomposition of biomass and plastic powder in additives 2 Other reducing gases such a...

Embodiment 3

[0092] The basic content of this embodiment is the same as that of Example 1, except that the reducing agent also includes aluminum powder, and the aluminum powder-300 mesh is 80%, that is, the particles smaller than 300 in the aluminum powder account for 80% ; The aluminum powder is externally prepared, and the aluminum powder accounts for 1.2% of the total mass of modified silicon carbide and modified quartz. The temperature is raised to 1300-1500°C for smelting. In this embodiment, it is 1380°C. The smelting time is 1-3h. The embodiment is 3h, and the reduction process is completed. Samples were cooled to room temperature, crushed and analyzed (W, Mo, P content). Among them, the reduction rate of tungsten is 73.1%, and that of molybdenum is 66.9%.

[0093] During the reduction process, the aluminum powder in the composite reducing agent releases a large amount of heat in the process of reducing the oxide, which promotes the fusion of the composite reducing agent and the or...

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Abstract

The invention discloses a method for smelting a ferrotungston-molybdenum-iron alloy by adopting a low-grade tungsten and molybdenum ore, and belongs to the field resource utilization of low-grade tungsten and molybdenum ores. The method includes the steps that a compound reducing agent is added into the low-grade tungsten and molybdenum ore, the proportion of the compound reducing agent and the low-grade tungsten and molybdenum ore is phi, as the formula shows in an original text that, wherein the value of gamma is 5-6, and the alpha is the mass ratio of modified silicon carbide to modified quartz; and the value of kappa is as the formula showing in the original text; and the compound reducing agent and the low-grade tungsten and molybdenum ore are added into a vacuum furnace, tungsten and molybdenum metal and slag are obtained through reduction, the tungsten and molybdenum metal and the slag are contained in a reaction furnace, steel scrap is added into the reaction furnace, temperature rising smelting is conducted, and the ferrotungston-molybdenum-iron alloy is obtained after smelting is completed. According to the method for smelting the ferrotungston-molybdenum-iron alloy by adopting the low-grade tungsten and molybdenum ore, tungsten and molybdenum in the low-grade tungsten and molybdenum ore can be utilized sufficiently, the harmful elements like P in the alloy can be reduced, and the quality of the alloy is improved.

Description

technical field [0001] The invention relates to the field of resource utilization of low-grade tungsten-molybdenum ore, and more specifically relates to a method for smelting tungsten-molybdenum-iron alloy by using low-grade tungsten-molybdenum ore. Background technique [0002] Tungsten and molybdenum are two important rare metals; as we all know, the iron and steel industry is a large user of tungsten and molybdenum. According to statistics, 40% of tungsten and 80% of molybdenum are used in the iron and steel industry. Tungsten and molybdenum are important elements in alloy steel, especially high-speed steel, tool and die steel, stainless steel, heat-resistant steel, magnetic steel, corrosion-resistant alloys and high-temperature alloys. Among them, tungsten is an element that can generate carbides. Adding it to steel can improve the toughness of steel. Tungsten carbide has finer particles and higher hardness, thus greatly improving the hardness and wear resistance of stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B34/34C22B34/36C22B1/242C22B5/02C22C33/04
CPCC22B1/2406C22B1/242C22B5/02C22B34/34C22B34/36C22C33/04Y02P10/20
Inventor 罗林根王海军凌海涛从俊强盛鹏飞付兵
Owner MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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