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Method for preparing iron oxide red by using ferrochrome

A technology of red iron oxide and ferrochrome, which is applied in the field of development and utilization of chromite ore, to achieve the effect of simplifying process equipment

Active Publication Date: 2019-06-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Various methods for preparing chromate in the industry can reduce or reduce the emission of Cr(VI) in chromium slag to a certain extent, but cannot completely avoid the presence of chromium in slag

Method used

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  • Method for preparing iron oxide red by using ferrochrome
  • Method for preparing iron oxide red by using ferrochrome

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] A titanium mesh with an outer diameter of 280 mm, an inner diameter of 80 mm, and a stainless steel mesh with an outer diameter of 70 mm were placed in a stainless steel hollow cylinder with an inner diameter of 300 mm. Hollow plastic partitions are used to insulate the titanium mesh and stainless steel. An electrolysis device with double anode and double cathode is formed. Fill the titanium mesh with 100 kg of ferrochrome with a particle size of <100 mm, and fill the electrolytic cell with 44 L of sodium hydroxide solution with a concentration of 260 g / L. The titanium mesh of the electrolytic cell is electrically connected with the positive pole of the power supply, and the stainless steel is electrically connected with the negative pole of the power supply. Turn on the power supply, adjust the output current to 100 A, and the cell voltage < 2.42 V. After 610 h of continuous electrolysis reaction, the temperature of the electrolyte is 50 ° C. During this period, water...

Embodiment 2

[0093]A conductive copper bar is arranged on the long side of a rectangular parallelepiped plastic tank with a length, width, and height of 400 mm*500 mm*500 mm. One side of the copper bar is electrically connected to the positive pole of the power supply, and the other side is electrically connected to the negative pole of the power supply. Place 4 sets of rectangular parallelepiped titanium mesh (length, width, height: 400 mm*50 mm*400 mm), 5 sets of stainless steel plates (length, width, height: 400 mm*2 mm*400 mm), titanium mesh and stainless steel plate on the conductive copper bar The spacing is 10mm. The titanium mesh is electrically connected to the positive pole of the power supply, and the stainless steel plate is electrically connected to the negative pole of the power supply. Fill each group of titanium mesh with 25 kg of ferrochrome with a particle size of <40 mm, and fill the plastic tank with 40 L of sodium hydroxide solution with a concentration of 110 g / L. Tu...

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Abstract

The invention relates to a method for preparing iron oxide red by using ferrochromium, wherein the method comprises the following steps: a first step, providing a preparation device including an electrolytic tank, a double-anode device, a double-cathode device, an insulating partition plate, a plurality of settling tanks and an electrode; a second step, carrying out an electrolytic reaction by a self circulating mode, automatically controlling the temperature at 20 DEG C-60 DEG C, and controlling the electrolyte solution circulating reaction time according to the formula 1 described in the specification, to obtain a high-concentration chromate solution and a solid slag material; a third step, carrying out conventional gravity magnetic sorting of the solid slag material obtained in the second step, and removing inclusion small-particle ferrochromium to obtain iron hydroxide with the particle size of 30 [mu]m-74 [mu]m; and a fourth step, calcining the iron hydroxide with the particle size of 30 [mu]m-74 [mu]m at the temperature of 500 DEG C-800 DEG C for about 1 h-4 h to obtain iron oxide red.

Description

technical field [0001] The invention relates to the development and utilization technology of chromite ore, in particular to a method for preparing iron oxide red by using ferrochrome. Background technique [0002] Chromium salt products play a very important and irreplaceable role in the national economy and people's lives, and the chromium salt industry is one of the most competitive resource raw material industries in the world. As the parent product of chromium salt, chromate is an indispensable and important chemical raw material in the development of national economy. The chromium salt products based on chromate include: dichromate, chromic anhydride, chromium oxide, chrome yellow and chromium salt essence (basic chromium sulfate), etc. These products are widely used in metallurgy, pigments, tanning, dyes, spices, metal surface treatment, welding electrodes, coinage, catalysts, printing and dyeing, medicine and other industries. According to statistics, 10% of the com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/18C25B15/08C25B15/02
Inventor 董亚萍冯海涛李武梁建李波张波郑竹林史建斌王永全杨维德史海琴
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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