Method for comprehensively utilizing asbestos tailings

A technology of asbestos tailings and filtrate, applied in the direction of magnesium oxide, magnesium hydroxide, iron oxide, etc., can solve the problems of high transportation cost, difficult control of magnesium hydroxide product quality, secondary pollution, etc., and achieve the effect of high leaching rate

Inactive Publication Date: 2012-02-29
XINJIANG LANTIAN WEIYE TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the process is that the added acid and caustic soda cannot be used in the end, and enter into the waste water to be discharged, forming secondary pollution, and the product quality of magnesium hydroxide and magnesium oxide is not easy to control
The acid and alkali are purchased through the market, and the transportation cost is relatively large

Method used

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  • Method for comprehensively utilizing asbestos tailings
  • Method for comprehensively utilizing asbestos tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1, the method for comprehensive utilization of this cotton tailings is carried out according to the following steps:

[0042] In the first step, the asbestos tailings and hydrochloric acid are fully reacted at normal pressure at 80°C to 110°C, and then filtered to obtain acid leaching solution and acid leaching residue respectively;

[0043] In the second step, the pickling solution obtained in the first step is fully oxidized with an oxidizing agent so that the divalent iron in it becomes ferric iron, and then mixed with 5% to 10% ammonia water at normal pressure, 50°C to 90°C The reaction is carried out at ℃, and the reaction is stopped when the pH value reaches 7 to 8, and the solid iron red and the second-step filtrate are respectively obtained by filtration;

[0044] The third step is to fully react the above-mentioned second step filtrate with 10% to 20% ammonia water at normal pressure, 50°C to 90°C, and a pH value of 10 to 11, and then filter to obtai...

Embodiment 2

[0046] Embodiment 2, the method for the comprehensive utilization of this cotton tailings is carried out according to the following steps:

[0047] In the first step, the asbestos tailings and hydrochloric acid are fully reacted at normal pressure, 80°C or 110°C, and then filtered to obtain acid leaching solution and acid leaching residue respectively;

[0048] In the second step, the pickling solution obtained in the first step is fully oxidized with an oxidizing agent so that the divalent iron in it becomes ferric iron, and then mixed with 5% or 10% ammonia water at normal pressure, 50°C or 90°C. The reaction is carried out at ℃, and the reaction is stopped when the pH value reaches 7 or 8, and the solid iron red and the second-step filtrate are respectively obtained by filtration;

[0049] The third step, after fully reacting the above-mentioned second step filtrate with 10% or 20% ammonia water at normal pressure, 50°C or 90°C, and a pH value of 10 or 11, filter to obtain ...

Embodiment 3

[0058] Embodiment 3, take the asbestos tailings of 1kg, its main component comprises SiO 2 41.22%, Al 2 o 3 0.10%, Fe 2 o 3 +FeO7.00%, CaO0.33%, MgO38.10%, K 2 O 0.04%, Na 2 O 0.22%, MnO 0.032%, weight loss at 800°C: 13.25%, mixed with the condensed liquid of the water vapor generated by the decomposition of magnesium chloride and the HCl mixture, and reacted in the enamel reactor, where the concentration of HCl is 15% or 22 % (or 15% to 22%), a total of 4500ml, a reaction temperature of 80°C or 110°C (or 80°C to 110°C), a reaction time of 1 hour or 2 hours (or 1 hour to 2 hours), normal pressure. Filter after the reaction, wash the filter cake, and dry to obtain high-silicon slag as a raw material for preparing fused magnesia; add the filtrate to the reactor, add 30ml of hydrogen peroxide with a concentration of 30% to carry out the oxidation reaction, and the reaction temperature is at 50°C or 90°C ℃ (or 50 ℃ to 90 ℃), then slowly add 5% to 10% (or 5% to 10%) ammonia...

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Abstract

The invention relates to a method for comprehensively utilizing asbestos tailings, and belongs to the technical fields of comprehensive utilization of non-metallic resources and resource recycling of solid wastes. The method comprises the following steps: 1, reacting the asbestos tailings with hydrochloric acid to give pickle liquor and acid leaching residue respectively; 2, reacting the pickle liquor prepared by step 1 with an oxidant first and then reacting with ammonia to give solid iron oxide red and filtrate of the step 2 respectively; 3, reacting the filtrate of the step 2 with the ammonia to give high purity solid magnesium hydroxide and filtrate of the step 3 respectively; and 4, fully mixing the acid leaching residue and iron oxide red with cokes to react fully at the temperatureof between 2,200 and 2,500 DEG C to give fused magnesite in the upper layer and silicoferrite in the lower layer. Through the method, the high purity magnesium hydroxide and silicoferrite are prepared from the asbestos tailings; minerals are leached by using the hydrochloric acid, and the leaching ratio is high; and the transport link of the hydrochloric acid and the ammonia is avoided, solid wastes are not generated, the emission of the wastes is zero, and the environment is protected.

Description

1. Technical field [0001] The invention relates to the technical field of comprehensive utilization of non-metallic resources and resource utilization of solid waste, and relates to a method for comprehensive utilization of asbestos tailings. 2. Background technology [0002] Asbestos is a naturally occurring collection of fibrous minerals that split into fine, flexible fibers. According to the difference in composition and structure, asbestos is generally divided into chrysotile asbestos (also known as serpentine asbestos), amphibole asbestos (alkaline amphibole asbestos is also collectively referred to as blue asbestos), brucite asbestos, etc. Among them, chrysotile has the largest output and the widest distribution, accounting for more than 98% of the total output. [0003] Asbestos is one of the earliest non-metallic mineral resources used by humans. It has the characteristics of friction resistance, heat resistance, corrosion resistance, sound insulation and light weig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/06C01F5/20C01F5/06C22C1/10
Inventor 杨刚
Owner XINJIANG LANTIAN WEIYE TECH DEV
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