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A composite reducing agent for smelting low-grade tungsten-molybdenum ore and its smelting method

A low-grade tungsten-molybdenum ore technology, which is applied in the field of compound reducing agent for smelting low-grade tungsten-molybdenum ore and its smelting field, can solve the problems of poor utilization effect of low-grade tungsten-molybdenum ore, improve reduction efficiency, increase reduction capacity, The effect of reducing reaction resistance

Active Publication Date: 2018-12-14
MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to overcome the deficiency of poor utilization effect of low-grade tungsten-molybdenum ore in the prior art, and provide a composite reducing agent for smelting low-grade tungsten-molybdenum ore and its smelting method.

Method used

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  • A composite reducing agent for smelting low-grade tungsten-molybdenum ore and its smelting method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] 本发明的一种用于冶炼低品位钨钼矿的复合还原剂,包括改性碳化硅、改性石英和添加剂;所述的改性碳化硅为碳化硅粉与硅粉的的混合物,所述改性石英为在表面包覆有包覆组分的石英,该包覆组分为沥青;包覆组分和石英混在50-90℃温度下混合搅拌得到改性石英,其中改性石英的石英与包覆组分的质量比为6-7:1,本实施例为7:1。

[0030] 即先将石英加入反应釜中升温至40-50℃,并保温20min,再升温至50-90℃,本实施例为60℃;再将沥青粉末加入反应釜中,并将沥青粉末包覆于石英表面得到改性石英,并保温10min。

[0031] 改性碳化硅在碳化硅粉和硅粉中加入高岭土,加水混合后得到改性碳化硅;所述碳化硅粉和硅粉的质量之比为2~4:1,本实施例为3:1;高岭土的-325目为90%,即小于325目的颗粒大于90%,本实施例为91%。改性碳化硅的具体制备步骤为:将碳化硅粉和硅粉中加入高岭土在烘箱中烘干,先向碳化硅粉中加入高岭土并在搅拌机中搅拌均匀,而后一边向搅拌机雾化的水溶液,一边向搅拌机中加入硅粉,加完之后继续混合均匀形成颗粒状,并加热烘干得到改性碳化硅。其中高岭土为中低温热液蚀变残余型高岭土,也称之为苏州土;本实施例的氧化铝含量为36%,二氧化硅48%。

[0032] 改性碳化硅与改性石英的质量之比为α,α取值为0.7~1.5,本实施例去α=1;所述的添加剂占改性碳化硅和改性石英总质量的1~4%。

[0033] 本发明的添加剂包括焦粉,所述焦粉在球磨机中进行球磨,在球磨机中球磨后焦粉的颗粒小于200目。

[0034] A kind of preparation method of composite reducing agent of the present invention, concrete steps are:

[0035] S1: Preparation of modified silicon carbide

[0036] Add kaolin to silicon carbide powder and stir evenly in a mixer, then add silicon powder to the mixer, and mix to obtain modified silicon carbi...

Embodiment 2

[0077] 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

[0079] 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%.

[0080] 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 compound reducing agent for smelting low-grade tungsten and molybdenum ores and a smelting method thereof, and belongs to the field of low-grade tungsten and molybdenum ore resource utilization. The compound reducing agent comprises modified silicon carbide, modified quartz and an addition agent. The modified silicon carbide is a mixture of silicon carbide powder and silica powder. The surface of the modified quartz is coated with a coating component, and the coating component includes asphalt. The addition agent comprises coke powder. According to the compound reducing agent for smelting the low-grade tungsten and molybdenum ores and the smelting method thereof, under the mutual promotion effect of the modified silicon carbide, the modified quartz and the addition agent, the reducing action on the low-grade tungsten and molybdenum ores is good; the silica powder coated on the surface of the modified silicon carbide has good reaction performance, the modified silicon carbide can respond to intervention quickly under the promotion effect of the modified quartz and further be reacted with CaMoO4 and CaWO4, the modified silicon carbide can further produce CO gas with reducibility in the reacting process, and reducing efficiency of the low-grade tungsten and molybdenum ores can be improved.

Description

technical field [0001] 本发明涉及低品位钨钼矿资源化利用领域,更具体地说,涉及一种用于冶炼低品位钨钼矿的复合还原剂及其冶炼方法。 Background technique [0002] 还原剂是在氧化还原反应里,失去电子或有电子偏离的物质。还原剂本身具有还原性,被氧化,其产物叫氧化产物。还原与氧化反应是同时进行的,即是说,还原剂在与被还原物进行氧化反应的同时,自身也被氧化,而成为氧化物。采用还原剂还原矿物中的金属氧化物生产金属,可以有效的从金属氧化物中提取金属。 [0003] 随着钨钼元素资源的日益消耗,钨钼矿产资的开采量逐渐增加;并导致有限的优质钨钼矿产资源正逐渐减少,钨钼矿在选矿的过程中,是将其中的有效组分选取后排放的矿浆经自然脱水形成的固体废料。低品位的钨钼矿固体废料就不再被利用,并被闲置于矿山,造成巨大的资源浪费和环境污染。对钨钼矿的处理方法过程中,常采用的是湿法处理工艺,但是湿法处理工艺工艺流程长,而且处理过程中容易产生酸或碱性气体对大气产生污染,在采用湿法进行处理时还会产生大量的废水,对环境造成不可忽视的危害。 [0004] 在冶炼的过程中也有现有的技术人员采用火法进行冶炼,例如:发明创造的名称为一种选冶结合的镍钼矿镍、钼分离方法(申请号:95110744.5申请日:1995-05-03)通过重选、粗分、抑镍浮钼和选择性低温火法还原富镍相结合的镍钼矿富集、分离工艺,可获得两种炉料,即一种为含钼高达11%,含镍为2%左右,另一种为含钼3%左右,含镍达8%的炉料,用于冶炼钼镍铁合金或镍钼铁合金。采用火法冶炼尾矿和低品位的矿;但是由于低品位钨钼矿的难以通过火法冶炼还原,致使低品位钨钼矿的火法冶炼效果较差,急需开发出一种专门应用于低品位钨钼矿冶炼的还原剂。 [0005] 此外,经检索,一种低品位镍钼矿直接冶炼镍钼铁合金的方法(申请号:201410308642.8,申请日2014.07.02),该方法包括镍钼矿加碱焙烧和中频炉金属直接热还原两个步骤,具体为:镍钼矿配加15-20%的强碱性物质组成的混合物在630-680℃下焙烧20-30min完成焙烧制得焙砂,并实现脱硫、焙砂在中频炉内用配碳硅铁直接热还原,还原过程通过控制反应温度与升温时间,控制焙砂分阶段完全还原,制得镍钼铁合金。但是该工艺却难以用于低...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B5/02C22B34/34C22B34/36
CPCC22B5/02C22B34/34C22B34/36
Inventor 凌海涛王海军罗林根从俊强盛鹏飞付兵
Owner MAANSHAN HUASHENG METALLURGICAL SCI & TECH DEV
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