A kind of decomposition method of asbestos tailings

A technology of asbestos tailings and asbestos, applied in the direction of process efficiency improvement, silicate, alkali metal silicate, etc., can solve problems such as low decomposition rate, "three wastes" generation, and incomplete process

Active Publication Date: 2018-06-15
NANYANG ORIENTAL APPL CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] To sum up, the currently reported decomposition methods for asbestos tailings, serpentine, and laterite nickel ore all have shortcomings such as incomplete process, low decomposition rate, and "three wastes" generation.

Method used

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  • A kind of decomposition method of asbestos tailings
  • A kind of decomposition method of asbestos tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1: Decomposition of asbestos tailings (without collecting short fibers)

[0060] A: Crush asbestos tailings to 120 mesh, asbestos tailings composition: SiO 2 : 41.81%, MgO: 35.74%, Fe 2 o 3 : 6.22%, NiO: 0.37%, CoO: 0.031%, Al 2 o 3 : 0.81%, loss on ignition: 13%.

[0061] B: Weigh 80kg of asbestos tailings powder (containing a small amount of short fluff) and the secondary acid hydrolysis solution at a solid-to-liquid ratio of 1:3 (secondary acid hydrolysis solution 240L) and mix them in the primary acid hydrolysis reactor, stir well and then add The activator is 800g, then the temperature is raised and sulfuric acid is added, the reaction temperature is controlled to be 80°C, the reaction time is 60min, and the final pH value is controlled to be 1. After the reaction was completed, 107kg of the first-grade acidolysis residue (48.5% water content, 55.1kg on dry basis) and 238L of the first-grade acidolysis solution were obtained by filtration.

[0062] Af...

Embodiment 2

[0070] Example 2: Decomposition of asbestos tailings (shrinking)

[0071] A: 100kg of asbestos tailings were crushed to 80 mesh, and 2.4kg of asbestos linters and 97.6kg of tailings powder were collected. The composition of tailings powder is: SiO 2 : 41.52%, MgO: 35.49%, Fe 2 o 3 : 6.34%, NiO: 0.38%, CoO: 0.041%, Al 2 o 3 : 0.88%, loss on ignition: 13.1%.

[0072] B: Weigh 80kg of asbestos tailings powder (excluding linters) and the secondary acid hydrolysis solution at a solid-to-liquid ratio of 1:3 (secondary acid hydrolysis solution 240L) and mix them in the primary acid hydrolysis reactor, stir well and then add 800g of activator, then heat up and add sulfuric acid, control the reaction temperature to 85°C, the reaction time is 40min, the pH value of the control end point is 0.8, after the reaction is completed, 108kg of first-grade acidolysis residue (water content 49.8%, dry weight 54.2kg) is obtained by filtration And primary acid solution 236L.

[0073] After a...

Embodiment 3

[0081] Embodiment 3: serpentine decomposes, as figure 2 shown

[0082] A: Crush 100kg of serpentine to 100 mesh, the composition is: SiO 2 : 39.21%, MgO: 34.46%, Fe 2 o 3 : 8.62%, NiO: 0.26%, CoO: 0.041%, Al 2 o 3 : 3.66%, loss on ignition: 11.88%.

[0083] B: Weigh 80kg of serpentine and the secondary acid hydrolysis solution according to the solid-to-liquid ratio of 1:4 (secondary acid hydrolysis solution 320L) and mix them in the primary acid hydrolysis reactor. After stirring evenly, add 800g of activator, then heat up and Sulfuric acid was added, the temperature was controlled at 90°C, the reaction time was 90 minutes, and the pH value at the end point was controlled to be 1. After the reaction was completed, 103 kg of the first-level acidolysis residue (52.66% water content, 48.8 kg on dry basis) and 304 L of the first-level acidolysis solution were obtained by filtration.

[0084] After analyzing and calculating the chemical composition of the primary acid hydrol...

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Abstract

The invention discloses a method for decomposing asbestos tailings. The operation steps include mechanical activation, multi-stage acidolysis, washing and alkaline hydrolysis, so that the silicon dioxide in the acidolysis residue is converted into water glass, and the water glass and water glass are obtained through separation. Alkali hydrolysis residue: send the water glass to the storage tank as a raw material for preparing silicon compounds, wash the alkali hydrolysis residue and send it to the first stage of acid hydrolysis process for cyclic decomposition. This decomposition method is also applicable to the decomposition of serpentine ore and laterite nickel ore, both of which belong to silicate minerals. The invention realizes the fully closed recycling use of asbestos tailings powder in the decomposition system, which not only eliminates the pollution caused by solid residue discharge to the environment, but also makes the silicon, magnesium, iron, nickel, cobalt, aluminum and other valuable elements in it completely Decomposition, thus laying the foundation for the comprehensive utilization of all elements of asbestos tailings.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of tailings and hydrometallurgy, and in particular relates to a decomposition method of asbestos tailings. Background technique [0002] The chemical composition of asbestos ore is Mg 6 [(OH) 4 Si 2 o 5 ] 2 , in theory, containing MgO 43.0%, SiO 2 44.1%, H 2 O12.9%. Asbestos tailings are a kind of waste rock tailings that are discharged during the mining and selection of chrysotile asbestos (the trade name is chrysotile, hereinafter referred to as asbestos). In addition to a small amount of asbestos, asbestos tailings are mainly composed of serpentine, magnetite, etc., and the chemical composition is SiO 2 (35%~45%), MgO (35%~42%), and also contains a small amount of Fe 2 o 3 , CaO, NiO, TIO 2 etc., the loss on ignition is about 13%. [0003] Asbestos tailings are a hazardous solid waste. In the beneficiation process of asbestos ore, about 27 tons of asbestos tailin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/06C22B3/12C01B33/32C22B26/22C22B21/00C22B23/00
CPCY02P10/20
Inventor 肖景波
Owner NANYANG ORIENTAL APPL CHEM RES INST
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