Method of producing eriochrome black with sodium bisulfate, byproduct of chromic trioxide

A technology of sodium bisulfate and by-products, applied in the field of chromium salts, can solve the problems of high cost and low economic benefit, and achieve the effects of low cost, simple process flow and easy availability of raw materials

Inactive Publication Date: 2012-02-15
GANSU JINSHI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing Fe-Cr series black pigment production technology is to reduce ferrous sulfate to sodium dichromate, add alkali to co-precipitate, wa...

Method used

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  • Method of producing eriochrome black with sodium bisulfate, byproduct of chromic trioxide
  • Method of producing eriochrome black with sodium bisulfate, byproduct of chromic trioxide
  • Method of producing eriochrome black with sodium bisulfate, byproduct of chromic trioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 1.314 kg of chromic anhydride by-product sodium bisulfate (solid state), stir and dilute (55 Baume) with 1 liter of water and filter to obtain sodium bisulfate solution (H 2 SO 4 : 280g / L, Cr 6+ (in Na 2 Cr 2 o 7 .2H 2 O meter): 46g / L), add 60 grams of 98w% sodium sulfite and stir to dissolve, after fully reacting, add 12 grams of iron scraps containing 95.8w% iron, boil to dissolve, filter to remove impurities. Add sodium hydroxide solution to the obtained filtrate and stir until the pH value is 5. Pour the reacted slurry into a cylinder container with a diameter of φ35mm and a height of 1500mm. Connect a 20KPa Roots fan through the vent hole at the bottom of the container, and blow in air to stir for 1 Hour. Filter the air-stirred slurry, wash the precipitate with hot water at 70°C until pH = 7, and dry the precipitate in an oven at 105°C for 2 hours. Grind the dried materials until all of them pass through a 200-mesh sieve, put the obtained raw material in...

Embodiment 2

[0043] Get 1.314 kilograms of chromic anhydride by-product sodium bisulfate, filter after stirring and diluting (55 Baume) with 1 liter of water, the gained sodium bisulfate solution (H 2 SO 4 : 280g / L, Na 2 Cr 2 o 7 .2H 2O: 46g / L), add 69.5 grams of 98w% sodium sulfite and stir to dissolve. After fully reacting, add 8.5 grams of iron scraps containing 95.8w% iron, boil to dissolve, and filter to remove impurities. Add potassium hydroxide solution to the obtained filtrate and stir until the pH value is 6. Pour the reacted slurry into a cylindrical container with a diameter of φ35mm and a height of 1500mm. Connect a 20KPa Roots-type fan through the vent hole at the bottom of the container, and blow in air to stir. 1 hour. Filter the air-stirred slurry, wash the precipitate with hot water at 70°C until pH = 7, and dry the precipitate in an oven at 250°C for 1.5 hours. Grind the dried materials until all of them pass through a 200-mesh sieve. Put the obtained raw material...

Embodiment 3

[0047] Get 1.971 kilograms of chromic anhydride by-product sodium bisulfate, filter after stirring and diluting (53 Baume) with 1.5 liters of water, gained sodium bisulfate solution (H 2 SO 4 : 280g / L, Na 2 Cr 2 o 7 .2H 2 O: 46g / L), add 92.6 grams of 98w% sodium sulfite and stir to dissolve. After fully reacting, add 16.9 grams of iron scraps containing 95w% iron, boil to dissolve, and filter to remove impurities. The obtained filtrate is adjusted to a pH value of 7 with 25w% ammonia water, and the reacted slurry is poured into a cylinder container with a diameter of φ35mm and a height of 1600mm, and a 20KPa Roots blower is connected through the vent hole at the bottom of the container, and air is blown in and stirred for 2 hours. Filter the air-stirred slurry, wash the obtained precipitate with hot water at 80°C, and dry the precipitate in a high-temperature furnace at 450°C for 1 hour. Grind the dried materials until all of them pass through a 200-mesh sieve, put the...

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Abstract

The invention discloses a method of producing eriochrome black with sodium bisulfate, a byproduct of chromic trioxide, and the method has the advantages of low cost and a simple process. The method is as follows: sodium bisulfate, the byproduct of chromic trioxide, and waste scrap iron are used as raw materials; solid sodium bisulfate is diluted with water and dissolved with stirring, sodium hydrosulphite is added into a sodium bisulfate solution which has been filtered and contains sodium bichromate for a reduction reaction, then waste scrap iron is added and dissolved through heating, and filtration is carried out to remove residues; the pH value of obtained filtrate is adjusted by a sodium hydroxide solution, air is blown in for stirring an obtained mixture, the mixture is then subjected to filtration and separation, obtained deposition is dried after rinsing and is then roasted at a high temperature so as to obtain an eriochrome black pigment with good dispersibility and powerful tinting strength. The beneficial effects of the invention are as follows: (1) raw materials used in the method are mainly the solid byproduct of sodium bisulfate generated in production of chromic trioxide and waste scrap iron, which enables environmental protection and energy saving to be realized, industrial waste materials to be effectively utilized and low cost to be achieved; (2) process flow is simple, the raw materials are easily available, and the method is applicable to industrial production.

Description

technical field [0001] The invention belongs to the field of chromium salts, in particular to a production method of Fe-Cr series black pigments. Background technique [0002] Sodium bisulfate, a by-product of chromic anhydride, is mainly composed of 33w% to 36w% sulfuric acid, 48w% to 50w% sodium sulfate, and 1w% to 3.5w% Cr 6+ (in Na 2 Cr 2 o 7 .2H 2 O), 0.2w% ~ 0.5w% (based on Cr 2 o 3 Calculated) of water-soluble trivalent chromium, 8w% ~ 11w% of water-insoluble matter. [0003] The main component of chrome black is Fe-Cr, which belongs to the hematite structural pigment, and the main component of the product is Fe 2 o 3 、Cr 2 o 3 . According to the different proportions of chromium and iron in the product, a variety of black→brown pigments are formed, which are mainly used for coloring paint, plastic, enamel and ceramics. [0004] The existing Fe-Cr series black pigment production technology is to reduce ferrous sulfate to sodium dichromate, add alkali to c...

Claims

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Application Information

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IPC IPC(8): C01G37/033
Inventor 张忠元毛雪琴武平
Owner GANSU JINSHI CHEM
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