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Method for preparing medium chrome yellow from bichromate or chromate

A technology of dichromate and chromate is applied in the preparation of chromate/dichromate, alkali metal nitrate, etc., and achieves the effects of easy large-scale promotion, simple reaction system and simple production process

Active Publication Date: 2016-12-21
徐宏军 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the medium chrome yellow produced by this method has improved heat resistance and light resistance, it still cannot avoid the problem of wastewater discharge in the production process

Method used

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  • Method for preparing medium chrome yellow from bichromate or chromate

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Effect test

Embodiment 1

[0034] The method for preparing medium chrome yellow as raw material with dichromate of the present embodiment is as figure 1 As shown, it proceeds in the following steps:

[0035] 1. Weigh 390g of potassium dichromate and 120g of sodium sulfate and add it into a 38% sodium hydroxide solution to adjust the pH to 8, then dilute to 4400mL;

[0036] Two, according to the amount of potassium dichromate in the step one, calculate the amount of required lead nitrate of complete reaction potassium dichromate, and take lead nitrate and be mixed with concentration and be 35% lead nitrate solution;

[0037] 3. Put the mixed solution obtained in step 1 into the preheating tank to preheat to 90°C;

[0038] 4. Add the lead nitrate solution prepared in step 2 to the preheated mixed solution in step 3. After standing for 20 minutes, cool to 90° C. to prepare a mixed slurry;

[0039] 5. Add 110 g of sodium silicate and 72 g of aluminum sulfate in turn to the mixed slurry prepared in step 4....

Embodiment 2

[0042] The method for preparing medium chrome yellow as raw material with dichromate of the present embodiment is as figure 1 As shown, it proceeds in the following steps:

[0043] 1. Weigh 300g of sodium dichromate and 135g of potassium sulfate and add it into a 40% sodium hydroxide solution to adjust the pH to 10, then dilute to 4300mL;

[0044] Two, according to the amount of sodium dichromate in step one, calculate the amount of required lead nitrate of complete reaction sodium dichromate, and take lead nitrate and be mixed with concentration and be 30% lead nitrate solution;

[0045] 3. Put the mixed solution obtained in step 1 into the preheating tank to preheat to 100°C;

[0046] 4. Add the lead nitrate solution prepared in step 2 to the preheated mixed solution in step 3, and after standing for 40 minutes, cool to 60° C. to obtain a mixed slurry;

[0047] 5. Add 118g of sodium silicate and 80g of aluminum sulfate successively into the mixed slurry obtained in step 4....

Embodiment 3

[0050] The method for preparing medium chrome yellow as raw material with dichromate of the present embodiment is as figure 1 As shown, it proceeds in the following steps:

[0051] 1. Weigh 480g of potassium dichromate and 130g of potassium sulfate and add it into a 20% potassium hydroxide solution to adjust the pH to 8.5, then dilute to 4800mL;

[0052] Two, according to the amount of potassium dichromate in the step one, calculate the amount of required lead nitrate of complete reaction potassium dichromate, and take lead nitrate and be mixed with concentration and be 45% lead nitrate solution;

[0053] 3. Put the mixed solution obtained in step 1 into the preheating tank to preheat to 70°C;

[0054]4. Add the lead nitrate solution prepared in step 2 to the preheated mixed solution in step 3. After standing for 23 minutes, cool to 70° C. to obtain a mixed slurry;

[0055] 5. Add 124g of sodium silicate and 78g of aluminum sulfate to the mixed slurry prepared in step 4. Aft...

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Abstract

The invention discloses a method for preparing medium chrome yellow from bichromate or chromate. The method for preparing medium chrome yellow from bichromate comprises the following steps: adding the bichromate and sulfate into a strong alkali solution, and preheating the bichromate, sulfate and the strong alkali solution; adding a lead nitrate solution; and sequentially adding sodium silicate and aluminum sulfate, and filtering the above obtained solution to obtain the medium chrome yellow. The method for preparing medium chrome yellow from chromate comprises the following steps: dissolving the chromate and sulfate in water, and preheating the chromate, sulfate and water; adding the lead nitrate solution; and sequentially adding sodium silicate and aluminum sulfate, and filtering the above obtained solution to obtain the medium chrome yellow. The preparation method has the advantages of simplicity, no generation of wastes or pollution, mild reaction conditions, great reduction of the synthesis cost, and great promotion and application potential in the chrome yellow preparation field.

Description

technical field [0001] The invention relates to the technical field of medium chrome yellow preparation, in particular to a method for preparing medium chrome yellow by using dichromate or chromate as a raw material. Background technique [0002] Chrome yellow, also known as lead chrome yellow, is a yellow pigment containing lead chromate. It has the advantages of bright color, strong hiding power, and good heat resistance, so it is widely used in plastics, inks, and paint industries. According to the difference in pigment ratio and preparation conditions, five different specifications of products are formed, including lemon yellow, light chrome yellow, medium chrome yellow, dark chrome yellow and orange chrome yellow. Medium chrome yellow is a kind of chrome yellow pigment. Its appearance is light red powder, and its lead chromate content is 90-94%. It is widely used in the paint industry, especially the application of road marking paint. [0003] The traditional productio...

Claims

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Application Information

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IPC IPC(8): C01G37/14C01D9/08
CPCC01D9/08C01G37/14
Inventor 徐宏军于广新于佳湲冯强
Owner 徐宏军
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