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Experimental Study on Preparation of Filling Cementitious Materials Based on Copper-Nickel Smelting Slag

  • Lei ZHANG , 1, 2 ,
  • Lijie GUO , 1, 2 ,
  • Wenchen LI 1, 2
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  • 1. BGRIMM Technology Group,Beijing 100160,China
  • 2. National Centre for International Research on Green Metal Mining,Beijing 102628,China

Received date: 2020-06-12

  Revised date: 2020-07-05

  Online published: 2020-11-05

Highlights

The copper nickel smelting slag is mainly the pyrometallurgical smelting slag discharged from the copper nickel ore in the smelting process.Its main elements are iron and silicon,with contents of about 40% and 30% respectively.Generally,the disposal of copper and nickel smelting slag is mainly stacking and landfill,which wastes land resources and pollutes the environment at the same time,so the comprehensive utilization rate is low.It has been shown that the copper nickel smelting slag has certain pozzolanic activity,and it is feasible to prepare filling cementitious materials with it.In this paper,copper and nickel smelting slag were ground to different fineness,cement mixed with smelting slag was used as cementitious material,Gobi aggregate was used as aggregate,and orthogonal test was carried out to prepare cementitious filler based on different grinding time,slag content and activator content of smelting slag.By measuring the uniaxial compressive strength of cemented backfill at different ages,the influence rule and mechanism of various factors on the compressive strength of cemented backfill were studied,and the final hydration products were qualitatively analyzed by SEM.The results show that with the increase of grinding time,the uniaxial compressive strength of cemented backfill increases at first and then decreases.The optimal grinding time is 50 min,corresponding to D(0.1),D(0.5) and D(0.9) of 4 μm,29 μm and 120 μm respectively.The addition of smelting slag reduces the uniaxial compressive strength of cemented backfill,but the reduction of compressive strength of backfill in the later period of maintenance is lower than that in the early period.The pozzolanic reaction of copper nickel smelting slag in cement Gobi aggregate system can promote the compressive strength of cemented backfill.SEM images show that the addition of Cu-Ni slag can promote the formation of ettringite and calcium silicate hydrate (C-S-H).The influence of activator on the uniaxial compressive strength of cemented backfill is not obvious.The results of orthogonal test show that the content of Cu-Ni smelting slag has the greatest influence on the uniaxial compressive strength of cemented backfill, the second is the content of activator,and the least is the grinding time.Using copper nickel smelting slag with grinding time of 50 minutes,the ratio of the slag to cement is 2∶8,the content of activator is 4%,and the uniaxial compressive strength of cemented backfill is the highest.

Cite this article

Lei ZHANG , Lijie GUO , Wenchen LI . Experimental Study on Preparation of Filling Cementitious Materials Based on Copper-Nickel Smelting Slag[J]. Gold Science and Technology, 2020 , 28(5) : 669 -677 . DOI: 10.11872/j.issn.1005-2518.2020.05.106

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自然资源部办公厅发出通知:完善储量动态更新机制 做好矿产资源国情调查

为全面及时准确掌握矿产家底现状,把握矿产资源国情国力状况,进一步夯实国家资源能源安全基础,自然资源部办公厅日前下发《关于完善矿产资源储量动态更新机制 做好矿产资源国情调查工作的通知》(以下简称《通知》),对相关工作作出部署。

《通知》指出,矿产资源是经济社会发展的物质基础,是国民经济健康发展的重要保障,矿产资源家底数据是基本国情国力的重要组成部分。健全完善矿产资源储量动态更新机制,摸清我国重要矿产资源数量、质量、结构和空间分布情况,是确保资源安全和经济安全的重要前提,是制定国家资源战略、决策、规划和完善产业政策、统筹资源开发和生态保护关系,以及合理配置资源、优化产业结构和推动区域经济发展的重要基础。

《通知》要求,要进一步完善矿山储量年报工作机制。储量年报直接反映矿产资源年度变化状况,是矿产资源储量动态更新的重要依据之一,要加强法理、制度、技术、监督和信息管理等方面研究,健全完善报送真实矿产资源储量动态数据的相关制度和工作机制。

矿山企业要按照矿产资源储量新分类标准,编制矿山储量年报,相关数据要与资源台账、地质测量及取样化验、生产设计图件一致;加快技术标准体系建设,建立数据规范、上下贯通、图数一致的数据汇总途径等。

《通知》强调,要重点做好战略性矿产资源国情调查。围绕国家紧缺战略性矿产,重点做好石油、天然气、铀、铁、铬、铜、铝、金、镍、钴、锂、锆、钾盐等矿产的国情调查。

一是由各省(区、市)自然资源主管部门组织实施查明矿产资源调查。摸清各类矿产的生产矿山、未利用矿区、关闭(停产)矿山和建设项目压覆等矿产资源储量现状基础数据。石油、天然气、铀矿的调查由部直接组织。各省(区、市)在统一要求的基础上可合理安排调查矿种。

二是由中国地质调查局组织实施矿产资源潜力评价。以地调项目为依托,以战略性矿产和新兴产业矿产为重点,综合运用多元信息圈定有利的找矿远景区,为矿产地质调查提供靶区,科学评价我国矿产资源潜力。

三是按照统一标准、全程控制、把握节点、严格验收的要求,建立自查自检、全面检查、全国核查的三级质量控制体系,实行责任到人的目标责任制,全程把控调查质量。对虚报、瞒报调查数据的,要通报、约谈;情节严重的,要将矿企或调查单位列入“黑名单”。

(来源:中国自然资源报)

http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-5-669.shtml

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