SU1468596A1 - Method of dressing manganese ores - Google Patents

Abstract

This invention relates to the enrichment of phosphorus-containing manganese ores by combined methods and m. It was used to prepare low-volume manganese raw materials for metal. And a heavy person. The purpose of the invention is to reduce the quality of manganese concentrate by reducing the impurity of phosphorus in it. The original manganese ore was crushed and enriched with a deposit. The jigging concentrate is ground together with a carbonaceous reducing agent at a ratio of, respectively, from 1: 0.32 to 1: 0.052 and then calcined at 1100-1300 ° C in the presence of powdered iron. The resulting gaseous phosphorus reacts with iron. The resulting iron-phosphorus-containing phase is separated by magnetic separation. The manganese concentrate is isolated from the dephosphorus calcined product by subsequent enrichment of the calcined product. While crimping is carried out with the content of crushed iron, 30-100 times higher than the phosphorus content in the concentrate, jigging of the original ore, and the particle size of iron particles and concentrate is the same. 2 h. the item f., 1 tab. cl

Description

one

The invention relates to the enrichment of raw materials by combined methods, in particular to the enrichment of phosphorus-containing manganese ores, and can be used to prepare low-grade manganese products for metallurgical processing.

The purpose of the invention is to improve the quality of manganese concentrate by reducing the impurity of phosphorus in it.

The essence of the method lies in the fact that the original manganese ore is crushed, enriches the crushed ore with a jigging, the resulting concentrate is crushed together

with a carbonaceous reducing agent, burned in a reducing atmosphere at 1100–1300 ° C in the presence of powdered iron, the iron-phosphorus-containing phase formed is separated by magnetic separation, and then the calcined product is enriched with a deposit. At the same time, the initial ore jigging concentrate is crushed with a carbonaceous reducing agent with a ratio from 1: 0.33 to 1: 0.052, roasting is carried out with a content of crushed iron, 30-100 times higher than the phosphorus content in the deposit, and the particle size concentrate.

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When co-grinding manganese concentrate with a carbonaceous reducing agent, mechanochemical processes take place, consisting in the formation of a new surface, which, with its high activity, is rapidly carbonized, creating a developed close contact of phosphorus-containing and carbonaceous materials. Carbonaceous materials are the most effective reducing agents for phosphorus, which is mainly found in the composition of tricalcium phosphate manganese ore raw materials. The introduction of carbon atoms into the crystal lattice of tricalcium phosphate 1a is accompanied by the separation of oxygen from phosphate ions.

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In addition to the lower limit, the degree of phosphorus removal decreases by 17–18%, and when it enters the substrate above the upper limit, the phase separation conditions deteriorate, and the loss of manganese with a metallic phase increases.

Example 1. The initial manganese oxide ore was crushed to a particle size of 20 mm on a jaw crusher and enriched on a jigging machine. The resulting concentrate contains,%: Mp 34; SiOs 21; P 0.24.

The concentrate is crushed on a jaw crusher to a particle size of 5 mm, together with coking. The mixture consists of 85% manganese concentrate and 15% coke. With anamalysis, silicon oxide in the ore reduces 5 pieces of ore to 5–6%. The temperature of the reduction of phosphorus and carbon carbon adsorbed during joint

koret this process. In the process of reduction firing, silicon oxide

phosphorus pentoxide (I /) ,,) I-, φ (to bota, after which it reacts with coal bar.

The resulting phosphorus gas is deposited using the active adsorbent, metallic iron, during the process of the formation. Forsfor actively reacts with the metallic phase of iron.

grinding in the pores of the ore and on the newly formed surface. The crushed mixture is loaded into a tube furnace, in which a reducing atmosphere is maintained (, 7-0.85), the temperature in the hot zone is 1150-1160 ° C.

At the same time, metal iron chips (fr. 5-O mm) in the amount of 12% are metered into the furnace in the amount of durable iron phosphides with respect to the co-image. The total js centrate (50 times more than the content of the reduction reaction) and phosphorus capture can be represented as follows:

Ca (PO. |) .2 + 5С + п51О2 + 6Ре 2РезР + + 5СО + (СаО) з-п5Ю2.

phosphorus in ore). The mixture is calcined in a rotary tube furnace with a length of 1000 mm and an inner diameter of 600 mm for 25 minutes. Then, from the calcined product on a magnetic separator,

The temperature limits of the reducing agent are 30 phosphides of iron, and the rest enrich

firing is determined by the conditions for the reduction and removal of phosphorus. The temperature of 1100 ° C is the onset temperature for the active decomposition of phosphates under reducing conditions. Reducing it does not allow to obtain conditions for the sublimation of phosphorus. An increase in temperature in excess of 1300 ° C causes active sintering of the entire batch, which makes further separation of the metal phase difficult, and the phosphorus content in the finished material increases by Fia 20-25% (relative).

The ratio of the ore to carbon components is dictated by the conditions of the active process, the reduction of phosphorus. When the content of carbonaceous reducing agent below the lower limit is not reached, the degree of dephosphorization is necessary. When the carbon reducing agent contains a higher upper limit, an increase in temperature occurs, as well as an excessive development of a vein phase in the microvolumes, which changes the further process of dephosphorization.

In order to evenly distribute metallic iron in the entire volume of the material and improve their contact, the particle size of Pe must be commensurate with the size of the ore particles.

These limits, but the content of the adsorbent in lUHXTC are dictated by the following state) b;)

jigging. The concentrate contains 39.5% manganese and 0.1% phosphorus, yield 69.3%.

Example 2. The original carbonate manganese ore is treated as in example 1. The final concentrate contains 51.5% manganese and 0.12% phosphorus, yield 69.3%. Example 3. Oxide manganese ore is treated but Example 1 with different parameters: the firing temperature, the ratio of manganese concentrate and coke and the mass fraction of iron. The results of the test 0 scientific research institutes listed in the table.

In parallel, for comparison, experiments were carried out in a known manner under identical conditions. From the obtained data it follows that the concentrate obtained by the proposed

This method has a higher metallurgical value (the P / Mp ratio of the proposed method is 0.003 to 0.0025, and the known p / Mp ratio is 0.0045). It is possible to melt manganese alloys from such a concentrate.

5Q in one stage without undergrading low-phosphorus P1lak.

Thus, the implementation of the proposed method results in a decrease in the phosphorus content in the concentrate, as well as an increase in the quality of the concentrate.

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Claims (3)

Claim 1. Method of enrichment of manganese ores, incl. Crushing initial ore crushing, from 0 In addition to the lower limit, the degree of phosphorus removal decreases by 17–18%, and when it enters the substrate above the upper limit, the phase separation conditions deteriorate, and the loss of manganese with a metallic phase increases. Example 1. The initial manganese oxide ore was crushed to a particle size of 20 mm on a jaw crusher and enriched on a jigging machine. The resulting concentrate contains,%: Mp 34; SiOs 21; P 0.24. The concentrate is crushed on a jaw crusher to a particle size of 5 mm, together with coking. The mixture consists of 85% manganese concentrate and 15% coke. With ana5 pieces of ore, up to 5-6% of carbon adsorbed during joint  ore pieces found up to 5-6% of carbon adsorbed during joint grinding in the pores of the ore and on the newly formed surface. The crushed mixture is loaded into a tube furnace in which a reducing atmosphere is maintained (, 7-0.85), the temperature in the hot zone is 1150-1160 ° C. At the same time, metal iron chips (fr. 5-O mm) in the amount of 12% with respect to the concentrate are metered into the furnace (50 times more than the phosphorus content in the ore). The mixture is calcined in a rotary tube furnace with a length of 1000 mm and an inner diameter of 600 mm for 25 minutes. Then, from the calcined product on a magnetic separator, iron phosphide, and the rest enrich iron phosphide, and the rest enrich jigging. The concentrate contains 39.5% manganese and 0.1% phosphorus, yield 69.3%. Example 2. The original carbonate manganese ore is treated as in example 1. The final concentrate contains 51.5% manganese and 0.12% phosphorus, yield 69.3%. Example 3. Oxide manganese ore is treated but Example 1 with different parameters: the firing temperature, the ratio of manganese concentrate and coke and the mass fraction of iron. The results of the test are listed in the table. In parallel, for comparison, experiments were carried out in a known manner under identical conditions. From the obtained data it follows that the concentrate obtained by the proposed This method has a higher metallurgical value (the P / Mp ratio according to the proposed method is 0.003 to 0.0025, and the known P / Mn ratio is 0.0045). It is possible to melt manganese alloys from such a concentrate. in one stage without undergrading low-phosphorus P1lak. Thus, the implementation of the proposed method results in a decrease in the phosphorus content in the concentrate, as well as an increase in the quality of the concentrate. Claim 1. Method of enriching manganese ores, including crushing initial ore, depositing crushed ore to produce concentrate, grinding jigging concentrate, burning it, and subsequently depositing calcined product to produce manganese concentrate, characterized in that, in order to improve the quality of manganese concentrate by reducing the phosphorus impurity in it, a carbonaceous reducing agent is introduced into the operation of grinding the jigging concentrate, and the crushed iron and osp are introduced into the operation of burning the jigging concentrate estvl dissolved it in a reducing atmosphere at 1100-1300 ° C to obtain zhelezofosforsoderzhaschey phase, whereafter the magnetic separation zhelezofosforsoderzhaschey phase of the fired product. 2. A method according to claim 1, characterized in that a carbonaceous reducing agent is introduced into the operation of grinding the jigging concentrate at a ratio of 1: 0.33-1: 0.052, respectively. 3. The method according to claim 1, wherein that the jigging of the jigging concentrate is carried out with the content of crushed iron, 30–100 times exceeding the phosphorus content of the jigging concentrate, while the size of the iron grinding is equal to the size of grinding of the jigging concentrate. The ratio of manganese concentrate and carbonaceous reducing agent Temperature, C The ratio of metallic iron to phosphorus containing in concentrate, times the mass fraction of metallic same07 Leza,% The degree of phosphorus removal,% R / Mp ratio in the finished product 1: 0.43 1000 25 6.0 10 1: 0.33 1100 thirty 7.5 50 1: 0.177 1: 0.052 1: 0.020 1150 1300 1350 50 12.0 60 100 24.0 55 105 25 15 0.0057 0.003 0.0025 0.0028 0.0053 1: 0.33 1100 1: 0.177 1: 0.052 1: 0.020 1150 1300 1350 25 , 0 10 thirty 7.5 50 50 12.0 60 100 24.0 55 105 25 15