SU1753951A3 - Method of desiliconization of ores - Google Patents

Abstract

Use: metallurgists of heavy non-ferrous metals, in particular, the desiliconization of iron ore raw materials. The removal of silicon from iron-containing oxide ores is carried out by fusing ore with soda ash, and the resulting alloy is treated with water or acid.

Description

The invention relates to the hydrometallurgy of metals and can be used to increase the degree of desiliconization of iron ore.

There is a known method of reverse cationic flotation, in which quartz and silicates are extracted into a froth product using a cationic collector, while the flotation of minerals containing iron is inhibited.

The disadvantage of this method is the relatively low iron content in the concentrate, as well as a small percentage of extraction from the ore. When the iron ore is enriched by the flotation method, the concentration of SI02 in the concentrate less than 0.8% cannot be reduced.

There is also known a method of desilicating sulfide ores, which consists in melting the sulfide raw material with silicate block, sodium sulfite and coal.

The disadvantage of this method is the high fusion temperature of the mixture.

(1200 ° C) and the duration of the process, the degree of desilication is low.

The purpose of the invention is to ensure the effectiveness of the desiliconization of iron oxide-containing ores.

This goal is achieved by the fact that according to the method of ore fossilization, which includes heat treatment of a mixture containing sodium salts, to produce a melt, soda ash is used as the sodium salt, and the melt is treated with water and acid.

Example 1. A sample of ore containing Rb20z 90%, incl. REUT 64.3% and about 5% SI02, weighing 2 g, is fused at a temperature of 800-850 ° C with the same amount of soda. The fusion is carried out in a platinum crucible for 20 minutes. When this happens the reaction

ReaOz + # 2CO3 - 2MaFeOa + C02: SI02 + # 2SO3 NazStOa + C02.

Yo

Xi

SL CO

Che

SL

with

Then, the melt was triturated to a fraction of minus 0.1 mm, transferred to a 200 ml beaker, and 50 ml of distilled water was poured. The sodium silicate goes into solution, and the sodium ferrite precipitates. After filtering the resulting solution, the cake is transferred back to the beaker and hydrolyzed at a temperature above 70 ° C for 0.5 h according to the equation

2NaFe02 - Н20 Рв20з + 2NaOH.

Then, the resulting solution is filtered again, and the cake is washed three times with warm water to remove traces of alkali, dried and analyzed for PeOssch, Pe20z, SI02- content. The results are as follows: Retob - 68.2%, Pe20z - 95.5%, S10 - 0.6%.

Example 2. A sample of ore with the same content of iron and silicon oxides as in the previous case, weighing 2 g is fused with 2 g of soda in a platinum crucible at 700-750 ° C. In this case, the iron oxide is converted to sodium ferrite by the equation

Re203 + # 2CO3 2NaFe02 + C02, and silicon oxide does not interact with soda at this temperature. After melting, the crucible is melted in a beaker and treated with 25 ml of 9% hydrochloric acid solution to transfer iron to soluble salt.

Fe02 + 4HCI - + NaCI + 2H20.

After the leaching is completed, the crucible is washed twice with distilled water, and the resulting solution is filtered from water-insoluble SiO2 on a fine sediment filter. A solution of sodium hydroxide is added to the filtrate until the formation of iron hydroxide is stopped. The precipitate formed is drained and calcined at 700 ° C. The finished product as well as in the previous example is analyzed for the content of Re0ssc, Re20z, SI02. The results are as follows: Revoob 68.8%. Re203 96.3%, SiO0 0.3%.

The use of the proposed method allows to increase the degree of obskrem; iron oxide ores.

Claims (1)

Invention Formula A method of desilicating ores, which includes heat treatment of a mixture containing nagri salts, to produce a melt, characterized in that, in order to ensure efficiently desilicating oxide iron-containing ores, soda ash is used as the sodium salt, and the melt is treated with water or acid.