Method for preparing white anticorrosive pigment/filler by using bauxite tailings

A bauxite and anti-corrosion color technology, applied in fibrous fillers, inorganic pigment treatment, chemical instruments and methods, etc., to achieve the effects of low cost, increased application range and added value, and high anti-corrosion performance

Inactive Publication Date: 2012-10-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Examples not yet prepared from industrial waste

Method used

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  • Method for preparing white anticorrosive pigment/filler by using bauxite tailings
  • Method for preparing white anticorrosive pigment/filler by using bauxite tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] After wet ball milling the bauxite beneficiation tailings until the tailings have a particle size of 95% to -10um, calcinate at 550°C for 3 hours, mix the calcined tailings and water in a beaker at a weight ratio of 1:4, stir, and discard the beaker Larger particles at the bottom (4.6% of tailings in beaker). Add 85% phosphoric acid into a beaker and mix with the tailings according to the molar ratio of phosphorus to all metal elements in the tailings except potassium and sodium as 3, and react at 120°C for 10 hours under sealed conditions. The reactants were polycondensed at 380°C for 12 hours. The polycondensate and zinc oxide are mixed at a weight ratio of 10:1.5, wet ball milled for 3 hours, calcined at 280°C for 3 hours, washed with water, and ball milled. The white powder obtained is the white anti-corrosion pigment and filler.

Embodiment 2

[0023] Dry ball mill the bauxite dressing tailings until the tailings have a particle size of 95% to -10um, then calcinate at 600°C for 2 hours, mix the calcined tailings and water in a beaker at a weight ratio of 1:5, stir and discard Black larger particles at the bottom of the beaker (accounting for about 5% of the tailings in the beaker). Add polyphosphoric acid into a beaker with the molar ratio of phosphorus to all metal elements except potassium and sodium in the tailings at 2.5, mix with the tailings, and react at 100°C for 8 hours under sealed conditions. The reactants were polycondensed at 220°C for 18 hours. Mix the polycondensate and zinc oxide at a weight ratio of 5:1, wet ball mill for 5 hours, calcinate at 300°C for 2 hours, wash with water, and ball mill, and the white powder obtained is the white anti-corrosion pigment and filler.

Embodiment 3

[0025] After wet ball milling the bauxite beneficiation tailings until the tailings have a particle size of 95% to -10um, calcinate at 650°C for 2 hours, mix the calcined tailings and water in a beaker at a weight ratio of 1:4.5, stir and discard Larger particles at the bottom of the beaker (approximately 5% of the tailings in the beaker). Pyrophosphoric acid and all metal elements in the tailings except potassium and sodium in a molar ratio of 4 are added to a beaker and mixed with the tailings, and reacted at 150°C for 6 hours under sealed conditions. The reactants were polycondensed at 300°C for 9 hours. The polycondensate and zinc oxide were mixed in a weight ratio of 6:1, wet ball milled for 4 hours, calcined at 300°C for 2 hours, washed with water, and ball milled. The white powder obtained was the white anti-corrosion pigment and filler. tailings composition

[0026] The composition of the bauxite beneficiation tailings used in the embodiment is shown in Table 1

[0...

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Abstract

The invention aims to provide a method for preparing white anticorrosive pigment / filler by using bauxite tailings. The method comprises the following steps of: ball-milling the bauxite tailings, then calcining the tailings at the temperature of between 500 and 800 DEG C, mixing and stirring the calcined tailings and water in a weight ratio of 1:3-1:5 in a beaker, and removing black large granulesaccounting for 5 percent of the mass of the tailings in the beaker at the bottom of the beaker; adding one of phosphoric acid, pyrophosphoric acid, polyphosphoric acid, metaphosphoric acid and hypophosphorous acid solution into the beaker in a molar ratio of the phosphorus to all metal elements except potassium and sodium in the tailings of 2 to 5, mixing the solution and the tailings, and reacting the mixture for 4 to 10 hours at the temperature of between 80 and 150 DEG C under a sealed condition; finally, performing condensation polymerization on the reaction product for 7 to 18 hours at the temperature of between 220 and 400 DEG C; and mixing the condensation polymerization product and zinc oxide in a weight ratio of 10:1-4:1, performing wet ball milling on the mixture for 2 to 5 hours, calcining the mixture for 2 to 6 hours at the temperature of between 200 and 300 DEG C, and washing and ball-milling the mixture to obtain white powder, namely the white anticorrosive pigment / filler. The white anticorrosive pigment / filler has the characteristics of strong anticorrosive capability, environmental protection and white color.

Description

technical field [0001] The invention belongs to the industrial waste recycling technology, in particular to a method for preparing white anti-corrosion pigments and fillers by using bauxite ore dressing tailings. technical background [0002] Bauxite beneficiation tailings are aluminosilicate wastes produced during the process of increasing the aluminum-silicon ratio of bauxite by mineral processing methods. It has the characteristics of large output, fine particle size, and complex composition. The main mineral phases are diaspore, kaolinite, illite, titanium-containing minerals, red limonite, etc. [1]. The main color-causing substances are Fe and organic matter, organic matter can be removed by calcination, and because Fe is distributed in multiple mineral phases, and the particle size of each mineral is fine, and the intermingling relationship is complicated, it is very difficult to use conventional methods such as magnetic separation, pickling, etc. It is difficult to r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/04C09C3/06C09C1/40
Inventor 卢清华
Owner CENT SOUTH UNIV
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