CN113088680A - 一种煤矿伴生金属的浸出方法 - Google Patents
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Abstract
本发明属于冶金技术领域,具体公开一种煤矿伴生金属的浸出方法,整个工艺流程设计先通过煅烧与浮选的结合,将煤矿伴生矿中伴生金属元素高效提取并转化为金属氧化物,后采用强酸将所有伴生金属转化为离子态,利用伴生金属与Co离子、Ce离子和Se离子之间的共沉淀作用的特性,使各伴生金属离子从离子态转化为固态分子而沉淀,实现了多种伴生金属元素的高效浸提,步骤简单易于操作,并且浸取原料价廉易得,绿色环保,具有较高的实用性。
Description
技术领域
本发明属于矿产开采技术领域,尤其涉及一种煤矿伴生金属的浸出方法。
背景技术
煤炭是地球上蕴藏最为丰富的燃料资源,长期以来一直占据着世界一次能源生产和消费领域的重要位置。我国的煤系底层分布广、厚度大,多数煤系地层不仅赋存着大量的煤炭资源,还共伴生有丰富的非金属矿产和一些有益元素,其中以稀有分散剂放射性元素较常见,如锗、镓、铀、钍等,这些共伴生矿产储量大,品位高,具有较高的开采价值。目前,许多国家在煤炭的综合利用方面都已投入相当的人力、物力和财力。随着科学技术的进步和现代工业的迅速发展,非金属矿产资源在国民经济建设中的作用和地位日益重要,而且矿物加工的深度和精度也日新月异,因此开发利用煤系中的伴生金属矿产资源显得尤为重要。但是现有技术中多采用酸浸或煅烧的方式提取煤矿伴生矿中的稀有金属,具有很强的指向性,单次仅能提取伴生矿中单一元素,多次提取工艺复杂且对环境污染严重,整体的浸取率仅能维持在60%左右,实用性较差。
发明内容
针对现有技术中煤矿伴生矿中的金属提取方法工艺复杂、提取效率慢、回收率低的技术问题,本发明提供一中煤矿伴生金属的浸出方法,可同时浸取多种伴生金属,并且工艺简单环保,具有很高的实用性。
为达到上述发明目的,本发明实施例采用了如下的技术方案:
一种煤矿伴生金属的浸出方法,具体包括以下步骤:
S1:将煤矿伴生矿粉碎成矿石粉末后煅烧得煅烧产物A;
S2:向所述煅烧产物A中添加重悬浮液进行浮选,得到下层沉淀物B;
S3:将所述沉淀物B烘干后进行研磨,加入分散剂后混合均匀,得分散溶液C;
S4:向所述分散溶液C中加入强酸进行反应,得反应产物D;
S5:向所述反应产物D中加入沉淀剂后调节溶液pH至碱性,过滤得混合物沉淀E,所述沉淀剂为氯化钴、氯化铯、氯化硒中的一种。
与现有技术相比,本申请先将细化后的伴生矿粉末煅烧,使矿石中的伴生金属转化成金属氧化物,再利用重悬浮液的重力浮选原理使碳上浮,金属氧化物沉淀,从而将煅烧产物中的金属氧化物与碳分离。整个工艺流程设计先通过煅烧与浮选的结合实现了煤矿伴生矿中伴生金属元素的高效提取,后用强酸将所有伴生金属转化为离子态,Ga离子、Ge离子、U离子和Th离子在碱性环境中与Co离子、Ce离子或Se离子可发生共沉淀作用,使各离子从离子态转化为固态分子而沉淀,实现了煤矿伴生矿中Ga、Ge、U、Th等多种伴生金属元素的同时提取,提高了煤矿伴生矿中金属的浸出率和浸出效率,并且浸取原料价格低廉易得,绿色环保,具有较高的实用性。
优选地,S1中所述矿石粉末的细度为100~120目。
优选的矿石粉末细度在保证矿粉的煅烧效率和燃烧效果的同时,避免了矿粉随气流排出造成损失,为后期的浮选过程提供优质的原料,提高浸出效率,又不增加浮选过程中的扩散阻力。
优选地,S1中所述煅烧的过程在管式加热炉中进行,煅烧温度为180~220℃,煅烧时间6~8h。
优选的煅烧工艺,可以保证煅烧过程中矿石粉末受热均匀,基本保证矿石粉末得到充分煅烧成煅烧产物,又能避免煅烧过程中煅烧产物发生二次反应导致变质。
优选地,所述重悬浮液为磁铁矿粉与水组成的重悬浮液,所述重悬浮液的加入量与所述煅烧产物A的质量比为2~4:1。
优选地,S3中所述分散剂为乙二醇,所述乙二醇的加入量与所述沉淀物B的体积比为4~6:1。
优选地,S4中所述强酸为盐酸、硝酸、硫酸中的一种,所述盐酸的质量浓度≥35%,硝酸和硫酸的质量浓度≥70%,强酸的加入量与沉淀物B的质量比为1:2~4,加入强酸后的反应在加热、搅拌的状态下进行,加热温度为60~80℃,搅拌速度为80~100r/min。
优选的强酸与金属氧化物反应的能力更强,配合特定的反应条件,能将沉淀物B中的伴生金属元素转化为离子态,反应时间快且转化率高。
优选地,S5中所述沉淀剂的加入量与沉淀物B的质量比为0.8~1.2:1,添加沉淀剂后调节溶液pH至10~14。
优选地,所述浸出方法还包括将所述混合物沉淀E烘干。
优选地,所述烘干时间为24~36h,烘干温度为60~70℃。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合具体实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本发明,并不用于限定本发明。
实施例1
一种煤矿伴生金属的浸出方法,具体包括如下步骤:
S1:将煤矿伴生矿粉碎后过100目筛,将所得矿石粉末置于管式加热炉中,在180℃的状态下煅烧7h,得煅烧产物A;
S2:向所述煅烧产物A中添加磁铁矿粉与水组成的重悬浮液进行浮选,得到下层沉淀物B,重悬浮液的加入量与煅烧产物A的质量比为3:1;
S3:将所述沉淀物B烘干后进行研磨,向研磨产物中加入乙二醇分散剂后混合均匀,得分散溶液C,乙二醇分散剂的加入量与沉淀物B的质量比为5:1;
S4:向所述分散溶液C中加入质量浓度为40%的盐酸,加热至60℃后在90r/min的搅拌状态下进行反应,得反应产物D,盐酸的加入量与沉淀物B的质量比为1:3;
S5:向所述反应产物D中加入与沉淀物B等质量的氯化钴后,加入氢氧化钠溶液调节溶液pH至12,过滤得混合物沉淀E;
S6:将所述混合物沉淀E在60℃的环境下烘干24H,收集后即得浸出后的伴生金属F。
实施例2
一种煤矿伴生金属的浸出方法,具体包括如下步骤:
S1:将煤矿伴生矿粉碎后过120目筛,将所得矿石粉末置于管式加热炉中,在200℃的状态下煅烧6h,得煅烧产物A;
S2:向所述煅烧产物A中添加磁铁矿粉与水组成的重悬浮液进行浮选,得到下层沉淀物B,重悬浮液的加入量与煅烧产物A的质量比为2:1;
S3:将所述沉淀物B烘干后进行研磨,向研磨产物中加入乙二醇分散剂后混合均匀,得分散溶液C,乙二醇分散剂的加入量与沉淀物B的质量比为6:1;
S4:向所述分散溶液C中加入质量浓度为75%的硝酸,加热至60℃后在90r/min的搅拌状态下进行反应,得反应产物D,盐酸的加入量与沉淀物B的质量比为1:2;
S5:向所述反应产物D中加入与沉淀物B等质量的氯化铯后,加入氢氧化钠溶液调节溶液pH=13,过滤得混合物沉淀E;
S6:将所述混合物沉淀E在70℃的环境下烘干30H,收集后即得浸出后的伴生金属F。
实施例3
一种煤矿伴生金属的浸出方法,具体包括如下步骤:
S1:将煤矿伴生矿粉碎后过120目筛,将所得矿石粉末置于管式加热炉中,在220℃的状态下煅烧8h,得煅烧产物A;
S2:向所述煅烧产物A中添加磁铁矿粉与水组成的重悬浮液进行浮选,得到下层沉淀物B,重悬浮液的加入量与煅烧产物A的质量比为4:1;
S3:将所述沉淀物B烘干后进行研磨,向研磨产物中加入乙二醇分散剂后混合均匀,得分散溶液C,乙二醇分散剂的加入量与沉淀物B的质量比为4:1;
S4:向所述分散溶液C中加入质量浓度为75%的硫酸,加热至60℃后在90r/min的搅拌状态下进行反应,得反应产物D,盐酸的加入量与沉淀物B的质量比为1:4;
S5:向所述反应产物D中加入与沉淀物B等质量的氯化铯后,加入氢氧化钠溶液调节溶液pH=10,过滤得混合物沉淀E;
S6:将所述混合物沉淀E在80℃的环境下烘干36H,收集后即得浸出后的伴生金属F。
检测例:
对实施1~3中S6所得的伴生金属F进行称重,并分析伴生金属F中Ga、Ge、U、和Th元素的质量百分含量。伴生金属F中Ga、Ge、U、和Th元素的质量百分含量,结果如表1所示,计算上述四种伴生金属实际浸出量和浸出率,结果如表2所示:
表1伴生金属F中各元素的质量百分含量
表2伴生金属浸出率
由表1和表2中的检测数据可知:本发明所提供的煤矿伴生金属浸出方法所获得的煤矿伴生金属的整体浸出率达70%~80%,能够同时提取出煤矿伴生矿中的多种伴生金属,提取率高,具有很高的实用性。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换或改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种煤矿伴生金属的浸出方法,其特征在于,具体包括以下步骤:
S1:将煤矿伴生矿粉碎成矿石粉末后煅烧得煅烧产物A;
S2:向所述煅烧产物A中添加重悬浮液进行浮选,得到下层沉淀物B;
S3:将所述沉淀物B烘干后进行研磨,加入分散剂后混合均匀,得分散溶液C;
S4:向所述分散溶液C中加入强酸进行反应,得反应产物D;
S5:向所述反应产物D中加入沉淀剂后调节溶液pH至碱性,过滤得混合物沉淀E,所述沉淀剂为氯化钴、氯化铯、氯化硒中的一种。
2.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S1中所述矿石粉末的细度为100~120目。
3.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S1中所述煅烧的过程在管式加热炉中进行,煅烧温度180~220℃,煅烧时间6~8h。
4.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S2中所述重悬浮液为磁铁矿粉与水组成的重悬浮液,所述重悬浮液的加入量与所述煅烧产物A的质量比为2~4:1。
5.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S3中所述分散剂为乙二醇,所述乙二醇与所述沉淀物B的体积比为4~6:1。
6.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S4中所述强酸为盐酸、硝酸或硫酸,且所述盐酸的质量浓度≥35%,硝酸和硫酸的质量浓度≥70%。
7.根据权利要求6所述的煤矿伴生金属的浸出方法,其特征在于,S4加入强酸后的反应在加热、搅拌的状态下进行,加热温度为60~80℃,搅拌速度为80~100r/min。
8.根据权利要求1所述的煤矿伴生金属的浸出方法,其特征在于,S5中所述沉淀剂的加入量与沉淀物B的质量比为0.8~1.2:1,添加沉淀剂后调节溶液pH至10~14。
9.根据权利要求1~8任一项所述的煤矿伴生金属的浸出方法,其特征在于,所述浸出方法还包括将所述混合物沉淀E烘干。
10.根据权利要求9所述的煤矿伴生金属的浸出方法,其特征在于,所述烘干时间为24~36h,烘干温度为60~70℃。
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