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Liquid phase leaching method of chromite or chromium-iron calcined molten salt

A molten salt and liquid phase technology, applied in the direction of chromate/dichromate, etc., can solve the problems of difficult industrialization, high production cost, furnace charge wall and low conversion rate of chrome ore, etc., to solve the problem of site occupation area Large, avoiding the sudden cooling and explosion of the furnace charge, and reducing the effect of leaching time

Active Publication Date: 2013-01-02
SICHUAN YINHE CHEM
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  • Application Information

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Problems solved by technology

[0003] Chinese patent application publication CN101066779A adopts the hot-mixing calcium-free sodium chromate preparation process, and obtains sodium chromate alkaline liquid through processes such as calcination, hot mixing, slaking, sorting, crushing and leaching. Problems with low wall and chrome ore conversion
Chinese patent application CN98100556.X uses sodium hydroxide molten salt medium to decompose chromite to prepare sodium chromate, and the product is leached in a high alkalinity area. Although this method reduces the reaction temperature, the method has a high alkali ratio and the resulting chromic acid There are many free alkalis in the sodium alkaline solution, the content of impurities is high, the post-treatment process is complicated, and the separation time of impurities is as long as tens of hours. Therefore, the production cost of this method is high and the industrialization is difficult.

Method used

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  • Liquid phase leaching method of chromite or chromium-iron calcined molten salt

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Embodiment 1

[0032]It is used for liquid phase continuous leaching of chromite molten salt. The liquid phase clinker enters through the high-level liquid phase feed port, and after being granulated and cooled by the horizontal rotary wheel, it is leached with water for 10 minutes, filtered, Sodium chromate alkaline solution and iron slag are obtained, and the gas generated during leaching is removed from the flue gas outlet of the gas collecting hood. The conversion and leaching rate of chrome ore (that is, the percentage of chromium in chromite ore converted into soluble chromium in sodium chromate alkaline solution) was determined to be 97.25%, and the iron mass content of iron slag calculated as ferric oxide was 62.31% .

Embodiment 2

[0034] It is used for liquid phase continuous leaching of chromite molten salt. The liquid phase clinker enters through the high-level liquid phase feed port, and after being granulated and cooled by the horizontal rotary wheel, it is leached with water for 15 minutes and filtered. Sodium chromate alkaline solution and iron slag are obtained. The gas produced in the leaching is removed from the flue gas outlet of the gas collection hood. It has been determined that the conversion and leaching rate of chromium ore is 98.19%, and the iron mass content of iron slag calculated as ferric oxide is 58.29%.

Embodiment 3

[0036] It is used for the liquid phase continuous leaching of yellow phosphorite molten salt. The liquid phase clinker enters through the high-level liquid phase feed port, and after being granulated and cooled by the horizontal rotary wheel, it is leached with water and filtered to obtain phosphorus liquid and phosphorus scum. The method of the present invention can also be used for the leaching of yellow phosphorite molten salt.

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Abstract

The invention discloses a rotary pulverizer, which includes a material inlet, a rotary wheel, a spraying device and a main body. The main body is provided with one or plural material outlets, the rotary wheel is used for pulverizing mineral molten salt from the material inlet, and the spraying device is used for spraying leaching solution in the main body to leach the mineral molten salt. The invention also discloses a liquid phase leaching method of chromite or chromium-iron calcined molten salt. According to the invention, chromite or chromium-iron calcined molten salt is decomposed in solution medium, to realize the leaching purpose.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for liquid phase leaching of chromite or ferrochrome roasted molten salt. Background technique [0002] Sodium red alum (sodium dichromate) as a basic chemical raw material occupies an important position in the national economy and is widely used in chemical industry, light industry, metallurgy, printing and dyeing, machinery, daily hardware and other industries. The raw material for the production of sodium rufite mainly comes from chromite ore or sodium chromate produced by roasting ferrochrome. The roasting process of chromite or ferrochrome is mainly divided into calcium roasting and calcium-free roasting. Their basic principle is to oxidize and roast chromite or ferrochrome and soda ash at high temperature to convert the chromium in the ore into Water-soluble sodium chromate. [0003] Chinese patent application publication CN101066779A adopts the hot-mixing calciu...

Claims

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Application Information

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IPC IPC(8): C01G37/14
Inventor 李先荣陈宁王方兵张建军
Owner SICHUAN YINHE CHEM