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Method for co-production of activated calcium silicate by adopting copper tailings to produce iron ore concentrate

A technology of active calcium silicate and copper tailings, applied in the field of metallurgy, can solve the problems of insufficient energy consumption and recovery of iron and silicon elements, a large proportion of weak magnetic fayalite, and inability to separate ferrosilicon, and achieve additional product additions. High value, high comprehensive utilization of resources, and the effect of reducing temperature

Inactive Publication Date: 2016-04-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also faces problems such as huge energy consumption and insufficient recovery of iron and silicon elements. The reason is that iron in copper tailings is mainly composed of fayalite (2FeO·SiO 2 ), magnetic iron oxide (Fe 3 o 4 ) phase exists in the slag, and the proportion of weakly magnetic fayalite is relatively large, so the separation of ferrosilicon by magnetic separation cannot be achieved.
However, the fayalite phase has a dense structure and a high melting point (1209°C), so it is difficult to destroy it through the current technology, so that the silicon and iron phases are separated, and the utilization rate of resources is extremely low.

Method used

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  • Method for co-production of activated calcium silicate by adopting copper tailings to produce iron ore concentrate

Examples

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Effect test

Embodiment 1

[0030] A kind of copper tailings of the present invention produces iron concentrate and co-produces active calcium silicate method, and its technological process is as follows figure 1 shown, including the following steps:

[0031] (1) Grind copper tailings to below 200 mesh, weigh 100g copper tailings and 150g NaOH (slag-alkali mass ratio 1:1.5) and mix evenly, place in a muffle furnace and heat to 500°C, keep the temperature for 1.5 hours for smelting . The smelted product is air-cooled, ground, and then soaked in water for 20 minutes. The water soaking temperature is 40°C, and the solid-liquid mass ratio is 1:15. After the water soaking is completed, the solid-liquid separation is carried out. The obtained filter residue is washed to neutral and then dried to obtain iron-rich concentrate Products, the iron grade reaches 52.11%.

[0032] (2) In the filtrate obtained in the solid-liquid separation step, add sodium stearate with 5% Si element mass in the filtrate and mix eve...

Embodiment 2

[0035] A kind of copper tailings of the present invention produces iron concentrate and co-produces active calcium silicate method, and its technological process is as follows figure 1 shown, including the following steps:

[0036](1) Grind the copper tailings to below 200 mesh, weigh 200g copper tailings and 400g NaOH (slag-alkali mass ratio 1:2) and mix evenly, place in a muffle furnace and heat to 550°C, keep the temperature for 2 hours for smelting . After the smelted product is air-cooled, it is ground and soaked in water for 40 minutes. The water immersion temperature is 50°C and the mass ratio of solid to liquid is 1:10. , the iron grade reaches 56.11%.

[0037] (2) In the filtrate obtained by solid-liquid separation in step (1), add sodium stearate of Si element mass 8% in the filtrate and mix evenly, then add slaked lime (Ca(OH) 2 After the mass fraction is 85%), the reaction temperature is controlled to be 80°C, and the reaction time is 70min. After the reaction i...

Embodiment 3

[0040] A kind of copper tailings of the present invention produces iron concentrate and co-produces active calcium silicate method, and its technological process is as follows figure 1 shown, including the following steps:

[0041] (1) Grind the copper tailings to below 200 mesh, weigh 100g copper tailings and 250g NaOH (slag-alkali mass ratio 1:2.5) and mix evenly, place in a muffle furnace and heat to 600°C, keep the temperature for 2.5 hours for smelting . The smelted product is air-cooled, ground, and then soaked in water for 50 minutes. The water soaking temperature is 60°C, and the solid-liquid mass ratio is 1:25. After the water soaking is completed, the solid-liquid separation is carried out. The resulting filter residue is washed to neutral and then dried to obtain iron-rich concentrate. Products, the iron grade reaches 59.26%.

[0042] (2) In the filtrate obtained by solid-liquid separation in step (1), add sodium stearate with 10% Si element mass in the filtrate a...

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Abstract

The invention discloses a method for co-production of activated calcium silicate by adopting copper tailings to produce iron ore concentration. The method comprises the following steps: 1. mixing copper tailings with alkali for smelting, soaking with water and filtering after smelting is completed to obtain filter residue I and filter liquor I; washing and drying the filter residue I to obtain iron-enriched ore concentrate; 2. adding slaked lime and a surface modifier to the filter liquor I to perform in situ modification so as to obtain filter residue II and filter liquor II, washing and drying the filter residue II to obtain activated calcium silicate, carrying out evaporative crystallization on the filter liquor II and then returning the filter liquor II to step I for reuse. The method realizes directional separation and enrichment of Fe and Si elements in the copper tailings and preparation of related high added-value products, and solves the problems of copper tailings that resource utilization rate is low, treatment energy consumption is high, secondary pollution is easy to cause due to reaction accessories and the like.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing iron concentrate from copper smelting tailings and co-producing active calcium silicate. Background technique [0002] Copper tailing slag is the tailing slag after the copper slag produced by smelting is crushed and screened, and the slag with a particle size of ≤12 mm is ball milled and then subjected to two flotations to extract copper. After the previous stage of treatment, the chemical composition of copper tailings is mainly fayalite, SiO 2 and CaO, some Fe 3 o 4 , Fe 2 o 3 、Al 2 o 3 and a small amount of MgO, K 2 O, Na 2 O, etc., in addition, it also contains trace elements such as Mn, Zn, Cu, Ti, etc. The grade of iron in the slag is generally about 40%, which is much higher than the minable grade of iron ore (29.1%), and the silicon content in the slag is also as high as 20%, which is an ideal silicon source. [0003] At present, except for a sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C01B33/24
CPCC01B33/24C22B1/005Y02P10/20
Inventor 郭学益陈靖之田庆华李栋
Owner CENT SOUTH UNIV