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Silicon dioxide adulterated composite material of humic acid and calcium, preparation method and application

A composite material, calcium humate technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve problems such as industrial production difficulties and complex preparation processes, achieve good adsorption capacity, increase specific surface area, and have obvious effects Effect

Active Publication Date: 2009-08-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these humic acid resins is relatively complicated, and in order to prevent excessive water resistance caused by ion hydration expansion, the adsorbent must be granulated, which brings certain difficulties to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The industrial-grade weathered coal sodium humate and deionized water are mixed according to the weight ratio of 1:5, centrifuged to separate the supernatant liquid, discard the black precipitate in the lower layer, and add concentrated hydrochloric acid to the supernatant liquid until The pH of the supernatant is 0.5. At this time, the supernatant becomes a black suspension. The suspension is centrifuged again, the supernatant is discarded, and the concentrated NaOH solution is added dropwise to the lower black solution. Dissolve the black precipitate to form a black solution, and control the pH of the black solution to 5. After evaporating the water in the black solution, purified sodium humate is obtained;

[0036] First prepare the sodium silicate solution (using sodium silicate with a modulus of 1 2 SiO 3 Mix with deionized water at a ratio of 1:10 in parts by weight to completely dissolve the solids for use. Mix the purified sodium humate and the prepared sodium silic...

Embodiment 2

[0040] Mix the industrial-grade sodium humate and deionized water according to the weight ratio of 1:10, centrifuge to separate the supernatant liquid, discard the black precipitate in the lower layer, add concentrated sulfuric acid to the supernatant liquid until the The pH value of the supernatant is 0.8. At this time, the supernatant becomes a black suspension. The suspension is centrifuged again, the supernatant is discarded, and concentrated NaOH solution is added dropwise to the lower black solution to dissolve The black precipitate forms a black solution, and the pH of the black solution is controlled to be 6, and after the water in the black solution is evaporated, purified sodium humate is obtained;

[0041] Prepare sodium silicate solution (use sodium silicate with a modulus of 2 2 O·2SiO 2 Mix with deionized water at a ratio of 1:10 in parts by weight to completely dissolve the solids, and use them for later use), mix the purified sodium humate and the sodium silicate s...

Embodiment 3

[0045] Mix industrial-grade weathered coal sodium humate, peat sodium humate and tap water at a weight ratio of 1:1:30, centrifuge to separate the supernatant liquid, discard the lower black precipitate, and add to the supernatant liquid Add glacial acetic acid until the pH of the supernatant is 1, when the supernatant becomes a black suspension, the suspension is centrifuged again, the supernatant is discarded, and the lower black solution is added dropwise Add concentrated NaOH solution to dissolve the black precipitate to form a black solution, and control the pH of the black solution to 7, after evaporating the water in the black solution, purified sodium humate is obtained;

[0046] Prepare sodium silicate solution (use water glass Na with modulus 3 2 O·3SiO 2 Mix with deionized water at a ratio of 1:10 in parts by weight to completely dissolve the solids for use.) The purified sodium humate and the sodium silicate solution as described above are mixed at a ratio of 1:7 in pa...

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Abstract

This invention relates to a method for preparing SiO2-doped calcium humate composite with 20-90 wt. % of calcium humate. The method comprises: (1) purifying industrial grade sodium humate; (2) uniformly mixing industrial grade sodium humate, Si source compound and water at a weight ratio of (0.1-7.5):1:10, heating to 80-90 deg.C, dropping acid at a rate of 1-10 mL / min until the pH value is 4-6, and reacting for 2 h to obtain composite precursor; (3) adding saturated CaCl2 solution into the composite precursor, reacting at 80-90 deg.C for 1 h for co-precipitation, centrifuging the reaction solution, taking out the lower layer black gel solid, and drying to obtain SiO2-doped calcium humate composite. The Si source compound is R2O.nSiO2 water glass, wherein, R is alkali metal, and n is 1-4.

Description

Technical field [0001] The invention relates to a silica-doped calcium humate composite material, a preparation method and use in the treatment of heavy metal ion pollutants in water. Background technique [0002] my country is a country with severe drought and water shortage. -The total amount of freshwater resources is 2.8 trillion cubic meters, accounting for 6% of the global water resources, second only to Brazil, Russia and Canada, ranking fourth in the world, but only 2,300 cubic meters per capita, only a quarter of the world average 1. One-fifth of the United States, it ranks 121st in the world and is one of the 13 countries with the poorest water resources per capita in the world. The per capita freshwater resources in our country are not rich, and due to the uneven distribution of time and space, water resources in a considerable part of the region are very scarce. With the development of economic construction, urban and rural construction, and population increase, water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/28B01J20/10B01J20/24B01J20/30
Inventor 尚宇陈运法叶树峰吴镇江张冬海
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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