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Process for pelletizing of iron oxide red pigment

A pigment and granulation technology, which is applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve the problems of fluidity and dispersibility inferior to spray granulation products, irregular product shapes, and increased production costs. Achieve good particle melting performance and dispersibility, good product quality, and reduce occupational diseases in the industry

Inactive Publication Date: 2006-06-28
杭州萧山永丰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the production cost increases
[0004] There are also some dry powder extrusion granulation methods, the resulting products are irregular in shape, fluidity and dispersion are not as good as spray granulation products, and the equipment price is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Throw 25kg of iron red powder into the 2000 disc granulator with an inclination angle of 45°, turn on the granulator, 25 rpm, then continuously throw 50kg of iron red powder, and spray 15kg of tap water, after 3min, add 25kg of iron red powder Red powder, after the particle size reaches the process requirements, the material is discharged, and the material is screened by a vibrating screen, and all the screened particles are put into a 1500 disc granulator without a stopper, an inclination angle of 45°, and 15 revolutions per minute, using a pressure of 0.15Mpa Spray the adhesive with a special spray tank, and the adhesive is prepared by 2kg of Pomido at 50% sodium silicate solution and 8kg of water. Then dry at 100°C for 6 hours to obtain the finished granular iron red.

Embodiment 2

[0015] In the 2000 disc granulator with an inclination angle of 40°, drop into 25kg iron red powder and the fine powder after the sieve of Example 1, start the granulator, adjust the rotating speed at 35 rpm, then continuously throw 50kg iron red powder, and simultaneously Spray 13kg of water, after 3 minutes, add 25kg of iron red powder, and discharge the material after the particle size increases to meet the process requirements. The following operations are the same as in Example 1.

Embodiment 3

[0017] Take 25kg of iron red powder and add it to the 2000 disc granulator with an inclination angle of 40°, start the granulator, 25 rpm, and continuously throw 50kg of iron red powder, spray 18kg of water at the same time, after 3.5min, then throw 25kg Iron red powder, after the particle size increases to meet the process requirements, it is discharged. Use a vibrating sieve to sieve, and all the granules that have been screened are put into the 1500 granulator, and the adhesive is sprayed. Adhesive ratio: 2.5kg of sodium silicate solution of Pomido at 49+100g of sodium hexametaphosphate+10kg of water. Then dry at 105°C until the volatile matter is below 1% to obtain the finished product.

[0018] The particle product of above-mentioned embodiment 1,2 and 3 adopts the evaluation method of iron red pigment to test, and the results are as shown in table 1:

[0019] Sample

[0020] From Table 1, from the perspective of tinting strength and color difference ΔE, ...

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Abstract

The invention discloses iron red pigment granulation method. It includes the following steps: putting iron red flour into granulating disc; spraying by water; sieving to gain the grain with 0.05-2.5mm grain diameter; spraying adhesive; and drying. The weight ration of iron red flour and water is 1:0.1-0.2. The use level of adhesive is 5-12% of the iron red flour. The method is convenient for industrialization, and has low energy consumption. It overcomes the defect of rising of the powder iron red dust, and has important meaning in environmental protection and reducing occupational disease.

Description

technical field [0001] The invention relates to a granulation method of iron red pigment. Background technique [0002] Traditional iron oxide pigments are sold in the market in the form of powder, because the price of powder iron red is lower than granular iron red, and the source is convenient, so it is accepted by some users. However, powdered iron red is easy to generate dust, pollute the environment, and easily cause occupational diseases such as pneumoconiosis. And iron red powder is not easy to measure, package and transport. With the progress of social civilization and the enhancement of people's awareness of environmental protection, the iron red pigment is developed in the direction of granulation. [0003] The granulation method of relevant iron red pigment has been reported in many patent documents both at home and abroad. For example, some patents of spray granulation in foreign countries are to pre-mix the pigment, additives and water into a slurry, and then...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/22C09C3/00
Inventor 张建春
Owner 杭州萧山永丰化工有限公司
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