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Treatment method of metal tailings

A metal tailings and treatment method technology, applied in the field of solid waste recycling, can solve the problems of high heavy metal content, complex element composition, and aggravate the difficulty of recycling useful elements, and achieve the effect of maintaining the stability of the ecological environment and efficient utilization

Active Publication Date: 2020-04-24
北京蔚然欣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the elemental composition in many tailings is relatively complex, and the content of heavy metals is high, especially the mixed accumulation of various metal tailings, which makes it more difficult to recover useful elements in tailings.

Method used

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  • Treatment method of metal tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] This embodiment deals with Xilin lead-zinc tailings, which contains elements such as zinc, lead, copper, cadmium, iron, silicon (muscovite, quartz), aluminum (gross garnet). The process is as follows:

[0055] Step a: Grinding the lead-zinc tailings to 200 mesh lead-zinc tailings powder.

[0056] Step b: Add water, NaOH, and quicklime to the lead-zinc tailings powder to make a slurry, so that the molar amount of sodium hydroxide in the slurry: the sum of the molar amounts of alumina+iron oxide+silica is equal to 2:1.1; the molar amount of calcium oxide is equal to 2:1.1; Quantity: The molar quantity of silicon oxide is equal to 1:1.1.

[0057] Step c: drying the slurry outside the kiln, and sintering the dried raw materials at 1150° C. for 4 hours to obtain sintered clinker.

[0058] Step d: Using a sodium carbonate solution with a concentration of 20 g / L, leaching under constant stirring at room temperature for 5 hours to obtain an aluminum-containing solution, that ...

Embodiment 2

[0066] This embodiment deals with Dexing copper tailings, which contain Zn, Pb, Al, Si, Fe and other elements. The process is as follows:

[0067] Step a: Grinding the copper tailings to 200 mesh copper tailings powder.

[0068] Step b: Add water, NaOH, and quicklime to the copper tailings powder to make a slurry, so that the molar amount of sodium hydroxide in the slurry: the sum of the molar amounts of alumina+iron oxide+silica equals 2:1; the molar amount of calcium oxide : The molar weight of silicon oxide is equal to 1:1.

[0069] Step c: drying outside the kiln, and sintering the dried raw materials at 1150° C. for 4 hours to obtain sintered clinker.

[0070] Step d: Using a sodium carbonate solution with a concentration of 25 g / L, leaching under constant stirring at room temperature for 5 hours to obtain a sodium metaaluminate solution, and separating the solid and liquid to obtain a solid slag.

[0071] Step e: drying the solid slag and crushing it into 200-mesh min...

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Abstract

The invention belongs to the technical field of resource utilization of solid waste, and particularly relates to a method for treating solid waste discharged by mine, metallurgy and chemical industries so as to facilitate comprehensive utilization. The treatment method of metal tailings comprises the following steps of ore grinding, alkali preparation, sintering activation, aluminum immersion in aweak base, pelletizing, high-temperature reduction and collection of volatile metals, crushing and magnetic separation, dilute sulfuric acid leaching, oxidation, dilute nitric acid leaching, HF acidtreatment for preparing silicon powder and the like. The method can separate and extract useful components such as aluminum, iron, lead, zinc, silicon, metals with activity less than H, and metals with activity greater than H for recycling so that more than 90% of the components in the metal tailings can be effectively separated, recycled and converted into high-value-added products, resource efficient utilization of the metal tailings is realized, and the reduction processing of harmful tailings is realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, in particular to a method for processing solid waste discharged from mining, metallurgy and chemical industry for comprehensive utilization. Background technique [0002] Tailings refer to the solid waste remaining after the ore is crushed, ground and smelted to obtain "useful components" concentrate under specific economic and technical conditions. China's mining industry started late. Restricted by factors such as mineral processing technology, production equipment and economic costs, the recovery rate of target minerals is 20% lower than that of developed countries. The average recovery rate of ferrous and manganese ferrous metal mines is only 65%. The comprehensive recovery rate of mining and selection is only 60% to 70%. In addition, 80% of China's mineral resources are associated ores. In particular, although the main ore-forming elements in the ore have been recovered to a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/16C22B1/244C22B1/248C22B1/02C22B21/00C22B13/02C22B19/20C22B19/30C22B17/02C22B15/00C01B33/18
CPCC01B33/186C22B1/02C22B1/16C22B1/244C22B1/248C22B7/001C22B7/006C22B7/007C22B13/025C22B13/045C22B15/0021C22B15/0063C22B17/02C22B17/04C22B19/20C22B19/30C22B21/0007C22B21/0023Y02P10/20
Inventor 潘爱芳马润勇畅捷马昱昭孙悦胡神涛李奎梦史国义
Owner 北京蔚然欣科技有限公司
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