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Method for manufacturing free flowing granular ferric oxide black pigment

A technology of iron oxide black and its manufacturing method, which is applied in chemical instruments and methods, fibrous fillers, inorganic pigment treatment, etc., to achieve the effects of easy transportation, moderate hardness and good sphericity

Inactive Publication Date: 2012-08-01
南通宝聚颜料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, it can solve the occupational disease problems caused by dust pollution in the pigment industry, protect the health of employees, and improve the working environment; second, it can improve the mechanization and automation level of the pigment use industry and improve work efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Use the iron oxide black filter cake material that meets the requirements first with a slurry mixing tank (the diameter of the mixing tank is φ1300 mm, and the height is 1500 mm; the diameter of the stirring blade is φ900 mm, the stirring speed is 80 rpm, and the motor power is 15KW ) for pre-dispersion, in the above slurry mixing tank, first add 160 kg of tap water, then start stirring, add 12 kg of sodium polyacrylate and 6 kg of disodium phosphate, continue stirring for about 5 minutes, and then add dry meter in batches Beat 800 kg of iron black filter cake. After feeding, stop stirring for 40 minutes. Sampling shows that the iron black solid content at this time is 49% (if the solid content is not in the range of 48-60%, a small amount of dry powder iron black or tap water can be used) Adjust and continue stirring for about 15 minutes). Then the above-mentioned pre-dispersed iron black slurry is circulated for 24 minutes through a colloid mill (output 3~10 tons / ...

Embodiment 2

[0029] (1) The preparation of iron black slurry, spray tower equipment parameters and drying process parameters are the same as in Example 1.

[0030] (2) The difference from Example 1 is that the atomizer adopts a pressure type, the diameter of the atomizer nozzle is Φ=0.8mm, the pressure of the feed pump is controlled at 2.5~2.7MP, and the flow rate of the feed liquid is 100 kg / hour.

[0031] (3) The tested color (compared with powdered similar products) and other physical indicators of the granular iron oxide black obtained from the spray tower of the above-mentioned pressure atomizer are shown in Table 2:

[0032] Table 2

[0033] .

[0034]It can be seen from Table 1 and Table 2 that whether the granular iron oxide black 708G obtained by the spray tower of the centrifugal or pressure atomizer is similar in color and physical index; and compared with the powdered similar product 708, the same The coloring strength and color hue are basically unchanged (total color diff...

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Abstract

The invention discloses a method for manufacturing a free flowing granular ferric oxide black pigment. The method mainly comprises the steps of preparing ferric oxide black liquid slurry and then obtaining the free flowing granular ferric oxide black pigment by granulation, namely preparing the slurry containing 48 to 60 percent of iron black solid from pre-dispersed ferric oxide black cakes, adding a certain amount of granulating additive, stirring, and performing colloid milling to obtain the iron black slurry; and spraying the prepared ferric oxide black liquid slurry to a granulation tower according to the flow rate of 80 to 120 kilograms per hour, atomizing, drying droplets in the tower during natural falling into granular powder through hot airflow in the tower, and discharging from the bottom of a drying tower. The granular ferric oxide black pigment obtained by spray granulation in the method has the characteristics of good spherical degree and uniform granules of which diameters are 60 to 160 microns, and the granular pigment has good free flowing property; and when the pigment is used, the pigment is convenient for conveying with material pipelines, automatic metering and the like, and does not produce a powder wall stagnation phenomenon in the pipelines and containers.

Description

technical field [0001] The invention relates to a method for manufacturing free-flowing granular pigments, in particular to a method for manufacturing spherical iron oxide black pigment particles obtained by spray-drying liquid slurry. The liquid slurry contains at least two or more additives. Background technique [0002] Iron oxide black is referred to as iron black, and its molecular formula is Fe 3 o 4 or Fe 2 o 3 .FeO, the chemical name is ferric oxide, belongs to the spinel type. It may also be called ferrous ferrite. It has saturated blue ink light black, strong tinting power and hiding power, very stable to light and atmosphere, insoluble in alkali, slightly soluble in dilute acid, completely soluble in concentrated acid, poor heat resistance, It is very easy to oxidize at a higher temperature to form red iron oxide red. Generally, it can be converted into γ-Fe by roasting at 200oC 2 o 3 , and above 300oC it transforms into α-Fe 2 o 3 , it has strong ferrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/24C09C3/04C09C3/10C09C3/06
Inventor 邵玉祥谭刚杨建明
Owner 南通宝聚颜料有限公司
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