Polysulfide iron sodium additive for strengthening low-temperature rapid reduction of refractory iron ore and application method of multi-sulfur iron sodium additive

An application method, the technology of sodium polysulfide, is applied in the field of additives for strengthening the solid-state reduction of iron ore, which can solve the problems of poor solid-state reduction effect of iron ore, complex production process of additives, and difficult treatment of metallurgical solid waste, etc. Iron ore solid-state reduction and co-processing of metallurgical solid waste, low price and reasonable composition

Active Publication Date: 2021-07-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These metallurgical solid wastes are difficult to deal with, and long-term accumulation will occupy land and pollute the environment
[0010] In order to solve the problems of poor solid-state reduction effect of refractory iron ore and complex production process or high cost of additives, and at the same time economically and rationally dispose and utilize metallurgical solid waste containing polysulfide ferric sodium, the present invention is proposed

Method used

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  • Polysulfide iron sodium additive for strengthening low-temperature rapid reduction of refractory iron ore and application method of multi-sulfur iron sodium additive
  • Polysulfide iron sodium additive for strengthening low-temperature rapid reduction of refractory iron ore and application method of multi-sulfur iron sodium additive
  • Polysulfide iron sodium additive for strengthening low-temperature rapid reduction of refractory iron ore and application method of multi-sulfur iron sodium additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The TFe content of a certain high alumina iron ore is 48.9%, Al 2 o 3 The content is 8.2%. Mix the finely ground iron ore with 15% mass ratio of sodium polysulfide additive to form agglomerates. After the obtained agglomerates are dried, they are reduced and roasted using lignite as a reducing agent. The roasting temperature is 1050°C. The time is 90 minutes. Compared with no addition of desulfurization slag, the average particle size of metallic iron particles in roasted ore grows from 5 μm to 46 μm, which can effectively improve the subsequent iron and aluminum separation effect. The iron grade of the magnetic separation concentrate is 91.2%, Al 2 o 3 The content is 1.30%, the iron recovery is 91.7%, and the aluminum removal rate is 91.0%.

Embodiment 2

[0050] The TFe content of a certain laterite nickel ore is 22.1%, and the Ni content is 1.91%. The finely ground laterite nickel ore is mixed with a mass ratio of 20% polysulfide sodium additive to make agglomerates. After the obtained agglomerates are dried, lignite is used as the The reducing agent is subjected to reduction roasting, the roasting temperature is 1100°C, and the roasting time is 60 minutes. Compared with no addition of desulfurization slag, the average particle size of nickel-iron alloy particles in roasted ore grows from 7 μm to 52 μm, which can effectively improve the subsequent separation effect of nickel-iron and gangue components. The iron grade of the magnetic separation concentrate is 80.0%, the nickel grade is 9.8%, the iron recovery rate is 56.9%, and the nickel recovery rate is 92%.

Embodiment 3

[0056] The TFe content of a certain high-phosphorus oolitic hematite is 49.0%, and the P content is 1.6%. The finely ground high-phosphorus oolitic hematite is mixed with a mass ratio of 8% polysulfide sodium additive to make agglomerates, and the obtained agglomerate After the blocks are dried, the anthracite is used as the reducing agent for reduction roasting, the roasting temperature is 1050°C, and the roasting time is 120 minutes. Compared with no addition of desulfurization slag, the average particle size of metallic iron particles in roasted ore grows from 9 μm to 48 μm, which can effectively improve the subsequent iron and phosphorus separation effect. The iron grade of the magnetic separation concentrate is 92.7%, the phosphorus content is 0.09%, the iron recovery is 92.5%, and the phosphorus removal rate is 96.1%.

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Abstract

The invention relates to an additive for strengthening solid reduction of refractory iron ore and application of the additive. The additive contains Na, Fe and S, wherein the valence state of S in the additive is less than 0, and Na, Fe and S exist in the form of compounds. The application method of the additive comprises the following steps of: uniformly mixing fine-fraction refractory iron ore with the polysulfide iron sodium additive for agglomeration; after drying the obtained agglomerates, putting the agglomerates in a reducing atmosphere for high-temperature roasting; and conducting ore grinding and magnetic separation on the cooled roasted product to obtain a magnetic metal iron/iron alloy product and non-magnetic tailings. The non-magnetic tailings containing sodium, iron and sulfur can be further separated and recycled to obtain the polysulfide iron sodium, so that the recycling of the additive is realized. The additive is mainly obtained from metallurgical solid waste, is low in price and environment-friendly, can provide technical support for efficient utilization of the refractory iron ore, has the advantage of co-processing the solid waste, is easy to industrialize, and has very wide popularization and application prospects.

Description

technical field [0001] The invention relates to an additive for strengthening the solid-state reduction of iron ore and its application, in particular to a polysulfide sodium additive for strengthening the low-temperature rapid reduction of refractory iron ore and its application. Background technique [0002] my country's iron ore resources are rich in reserves, but they are poor, fine and miscellaneous, with few economically recoverable reserves, more lean ores, and less rich ores; there are many associated ores, which are difficult to process and smelt, and the cost of development and utilization is high. In recent years, the solid-state reduction roasting-separation process has been widely used in the processing of complex iron ore resources due to its advantages of simple process, short process and low operating cost. However, since the subsequent physical separation process has higher requirements on the size of metallic iron grains, the aggregation and growth of metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C21B13/00
CPCC22B1/02C21B13/008Y02P10/20
Inventor 饶明军张鑫李光辉张树辉姜涛罗骏彭志伟陈靖
Owner CENT SOUTH UNIV
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