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Methodof producing zeolite molecular sieve by utilizing tailings

A technology for zeolite molecular sieve and tailings, which is applied in the field of solid waste recycling, can solve problems such as the preparation of zeolite molecular sieves that have never been seen before, and achieve the effects of reduced environmental protection costs, strong adsorption capacity, and obvious social effects.

Active Publication Date: 2015-11-11
陕西宏科绿色建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After review, there is currently no report on the preparation of zeolite molecular sieves from gold tailings, iron tailings and vanadium tailings

Method used

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  • Methodof producing zeolite molecular sieve by utilizing tailings
  • Methodof producing zeolite molecular sieve by utilizing tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of zeolite molecular sieves from gold tailings. The specific steps are:

[0042] The first step: tailings pretreatment. First carry out dilute hydrochloric acid pickling and filtration on the gold tailings, fully mix and stir with the tailings at room temperature for 30 minutes, and then place them in a blast drying oven to dry to constant weight;

[0043] The second step: the preparation stage of alkali fusion clinker. Weigh 10g of NaOH solid particles and 12g of pretreated gold tailings to mix and grind evenly, then use a certain amount of Al(OH) 3 The powder is added to the mixture to adjust Si / Al to about 1.0, and then placed in a nickel phase pot and roasted at 680°C for 180 minutes to obtain alkali-soluble clinker;

[0044] The third step: hydrothermal synthesis stage. After the alkali-soluble clinker in the second step is cooled, grind it into fine pieces, add deionized water to mix evenly, stir and age to adjust the liquid-solid ratio to 6:1, and...

Embodiment 2

[0046] Preparation of zeolite molecular sieves from vanadium tailings. The specific steps are:

[0047]The first step: tailings pretreatment. The vanadium tailings are first melted at high temperature, and the vanadium tailings are placed in a tube furnace and heated at 1200°C for 30 minutes; then adsorbed to a constant weight with a magnet. Then use dilute sulfuric acid to fully mix and stir the tailings at room temperature for 1 hour, then filter and dry, and then place it in a blast drying oven and blast dry to constant weight;

[0048] The second step: the preparation stage of alkali fusion clinker. Weigh 10g of KOH solid particles and 15g of pretreated iron tailings, mix and grind evenly, and then use a certain amount of Al 2 o 3 The powder is added to the mixture to adjust Si / Al to about 1.8, and then placed in a nickel phase pot and baked at 720°C for 120min;

[0049] The third step: hydrothermal synthesis stage. After the alkali-soluble clinker in the second step...

Embodiment 3

[0051] Preparation of zeolite molecular sieves from iron tailings. The specific steps are:

[0052] The first step: tailings pretreatment. First, the iron tailings are melted at high temperature, and the iron tailings are placed in a muffle furnace and heated at 800°C for 50 minutes; then placed in a magnetic separator for magnetic removal of iron to constant weight. Then use dilute sulfuric acid to fully mix and stir the tailings at room temperature for 40 minutes, then filter and dry, and then place it in a blast drying oven and blast dry to constant weight;

[0053] The second step: the preparation stage of alkali fusion clinker. Weigh 10g KOH solid particles and 14g pretreated iron tailings, mix and grind evenly, and then use a certain amount of Al 2 o 3 The powder is added to the mixture to adjust Si / Al to about 1.5, and then placed in a nickel phase pot and baked at 700°C for 150min;

[0054] The third step: hydrothermal synthesis stage. After the alkali-soluble cl...

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Abstract

The invention discloses a method of producing a zeolite molecular sieve by utilizing tailings. The method comprises the following steps: (1) preprocessing tailings: carrying out acid pickling, high-temperature melting and magnetic absorption on the tailings to remove iron impurities in the tailings; (2) preparing alkali fusion clinker: mixing alkaline solid particles and the tailings to obtain a mixture I, grinding the mixture I, then adding an aluminum compound into the mixture I to adjust an Si / Al ratio, and then roasting the mixture I to obtain the alkali fusion clinker; (3) hydrothermally synthesizing: cooling the alkali fusion clinker, then porphyrizing the alkali fusion clinker, adding deionized water into the alkali fusion clinker, mixing, stirring and aging to obtain a mixture, crystallizing the mixture under self-generated pressure, taking out the mixture, cooling, filtering, washing, and then drying to obtain a finished product molecular sieve. The tailings are used as a main raw material, a zeolite molecular sieve is prepared in an alkali fusion hydrothermal method, the specific surface area of the prepared zeolite molecular sieve reaches 564.2m<2> / g, the density reaches 2.11g / cm<3>, and the prepared zeolite molecular sieve has the performance parameters of a commodity molecular sieve. By adopting the method, solid waste is recycled, the gap of the prior art is filled, and the high-added-value regeneration and utilization of the tailings is realized.

Description

technical field [0001] The invention relates to a resource utilization approach of tailings, in particular to a method for producing zeolite molecular sieves from tailings, and belongs to the technical field of solid waste resource utilization. Background technique [0002] We will generate a lot of waste in our daily life and production. If these wastes are not disposed of and used, they will seriously pollute our living environment and cause a lot of resource loss. For example: a large amount of tailings produced during the beneficiation process will occupy a large amount of land if they are allowed to be stockpiled, and the heavy metal ions contained in them will enter the surface water with rainwater and cause water pollution. Waste of resources. The best way to solve these problems is to recycle these wastes to prepare new materials, which can realize "recycling", "harmless" and "reduction" at the same time. However, the current resource utilization of tailings is lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B09B3/00
Inventor 刘璇周春生张国春崔孝炜王之宇郭家林杨娇南宁
Owner 陕西宏科绿色建材有限公司
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