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Method for smelting low-grade tungsten and molybdenum ore and method for recycling phosphorus simultaneously during smelting of low-grade tungsten and molybdenum ore

A low-grade tungsten-molybdenum ore technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as poor utilization effect, and achieve the effects of improving reducing ability, reducing reaction resistance and improving reduction efficiency.

Active Publication Date: 2017-10-20
MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of poor utilization of low-grade tungsten-molybdenum ore in the prior art, and provide a method for smelting low-grade tungsten-molybdenum ore and a method for recovering phosphorus at the same time. During the smelting process, by adding a composite reducing agent, The reducing agent has a good reduction effect on low-grade tungsten-molybdenum ore through the mutual promotion of modified silicon carbide, modified quartz and additives, and promotes the CaMoO 4 、CaWO 4 Reduction to obtain metal tungsten and metal molybdenum; further, the Ca 5 (PO 4 ) 3 The P element of F is reduced, and the red phosphorus is recovered through the cooling and liquefaction of the tail gas

Method used

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  • Method for smelting low-grade tungsten and molybdenum ore and method for recycling phosphorus simultaneously during smelting of low-grade tungsten and molybdenum ore
  • Method for smelting low-grade tungsten and molybdenum ore and method for recycling phosphorus simultaneously during smelting of low-grade tungsten and molybdenum ore

Examples

Experimental program
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Effect test

Embodiment 1

[0036]A composite reducing agent for smelting low-grade tungsten-molybdenum ore of 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 quartz coated with a coating component on the surface, and 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 quartz of modified quartz is The mass ratio to the coating component is 6-7:1, and it is 7:1 in this embodiment.

[0037] 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.

[00...

Embodiment 2

[0084] 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

[0086] 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. After cooling to room temperature and crushing, detection and analysis (W, Mo, P content). Among them, the reduction rate of tungsten is 73.1%, and that of molybdenum is 66.9%.

[0087] 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 a...

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Abstract

The invention discloses a method for smelting low-grade tungsten and molybdenum ore and a method for recycling phosphorus simultaneously during smelting of the low-grade tungsten and molybdenum ore and belongs to the field of resourceful utilization of the low-grade tungsten and molybdenum ore. The method for smelting the low-grade tungsten and molybdenum ore specifically includes the steps that (1) ore powder pre-treatment is performed, specifically, ore powder is added into a ball mill for ball milling; (2) mixing and pelletizing are performed, specifically, a composite reducing agent is added into the ore powder for dry mixing, a bonder is added into a mixture obtained after uniform mixing is finished, and tungsten and molybdenum ore pellets are prepared on a disc pelletizing machine; and (3) smelting of the tungsten and molybdenum ore is performed, specifically, the tungsten and molybdenum ore pellets are dried in a drying oven and then added into a vacuum furnace for reducing smelting, and the smelting temperature ranges from 1300 DEG C to 1500 DEG C. By means of the method for smelting the low-grade tungsten and molybdenum ore, silicon powder wrapping the surface of modified silicon carbide of the composite reducing agent is good in reaction property and can rapidly intervene in the reaction under promotion of modified quartz, CO with the reducing property can be generated during reaction of the modified silicon carbide, and the reducing efficiency of the low-grade tungsten and molybdenum ore can be 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 low-grade tungsten-molybdenum ore and a method for simultaneously recovering phosphorus. Background technique [0002] With the increasing consumption of tungsten and molybdenum resources, the mining volume of tungsten and molybdenum mineral resources is gradually increasing; and the limited high-quality tungsten and molybdenum mineral resources are gradually decreasing. The solid waste formed by the natural dehydration of the discharged pulp. The low-grade tungsten-molybdenum ore solid waste is no longer used, and is left idle in the mine, causing huge waste of resources and environmental pollution. In the process of processing tungsten-molybdenum ore, the wet treatment process is often used, but the wet treatment process has a long process flow, and it is easy to produce acid or alkaline gas during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/34C22B34/36C22B1/242C22B5/02C01B25/023
CPCC01B25/023C22B1/2406C22B1/242C22B5/02C22B34/34C22B34/36
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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