阅读说明：本技术 一种从含硅矿或渣中脱硅的方法 (Method for desiliconizing silicon-containing ore or slag ) 是由 马保中 王成彦 曹志河 邢鹏 陈永强 张文娟 荆乾坤 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种含硅矿或渣中脱硅的方法,属于有色金属冶金领域。脱硅方法包括：利用硝酸加压实现硅的活化,控制硝酸的浓度为150～300g/L,浸出温度为180～220℃；然后向活化渣中按照固液比1:0.5～1:2g/mL添加浓度为85％的磷酸,充分搅拌后,放置于220～260℃的马弗炉中预处理；预处理后的物料水浸,即可实现硅的脱除与分离。本方法利用硝酸加压,将矿物或渣中的硅进行活化转型,利用磷酸预处理和水浸将硅脱除和分离,试剂消耗少,流程短,成本低,为含硅矿或渣中硅的脱除提供了新思路,为矿物或渣后续的高值化利用提供了基础。(The invention discloses a method for desiliconizing silicon-containing ores or slag, belonging to the field of nonferrous metallurgy. The desilication method comprises the following steps: pressurizing by using nitric acid to realize activation of silicon, controlling the concentration of the nitric acid to be 150-300 g/L, and controlling the leaching temperature to be 180-220 ℃; adding 85% phosphoric acid into the activated slag according to the solid-to-liquid ratio of 1: 0.5-1: 2g/mL, fully stirring, and placing in a muffle furnace at 220-260 ℃ for pretreatment; and (4) soaking the pretreated material in water to realize the removal and separation of silicon. The method utilizes nitric acid for pressurization, carries out activation transformation on silicon in the minerals or the slag, utilizes phosphoric acid pretreatment and water immersion to remove and separate the silicon, has less reagent consumption, short flow and low cost, provides a new idea for removing the silicon in the silicon-containing ores or the slag, and provides a foundation for subsequent high-value utilization of the minerals or the slag.)

1. A method of desiliconizing a silicon-containing ore or slag comprising the steps of:

step one, nitric acid activation transformation: adding nitric acid with a certain concentration into the silicon-containing ore or slag, carrying out activation transformation, and carrying out liquid-solid separation on the transformed ore pulp to obtain leachate and activated slag;

step two, pretreatment of phosphoric acid: adding phosphoric acid into the activated slag obtained in the first step according to a certain solid-to-liquid ratio, fully stirring, and placing in a muffle furnace to complete pretreatment;

step three, water leaching and desiliconization: and (4) leaching the pretreated material in the step two by using hot water for desiliconization, and then carrying out solid-liquid separation to realize the removal of silicon in the silicon-containing ore or slag.

2. The method according to claim 1, wherein during the nitric acid activation transformation, the concentration of nitric acid is 150-300 g/L, the solid-to-liquid ratio is 1: 2-1: 5g/mL, the leaching temperature is 180-220 ℃, the leaching time is 1-4 h, and the stirring speed is 350-600 rpm.

3. The method according to claim 1, wherein the phosphoric acid with a concentration of 85% is mixed with the leaching residue in a solid-to-liquid ratio of 2:1 to 1:2g/mL in the pretreatment of the diphosphoric acid in the step.

4. The method according to claim 1, wherein the temperature of the phosphoric acid pretreatment is 220-260 ℃ and the time is 0.5-2 h.

5. The method for desiliconizing from siliceous ores or slags according to claim 1, wherein in the step three, when water leaching is carried out for desiliconization, the water leaching temperature is 60-90 ℃, the solid-to-liquid ratio is 1: 2-1: 5g/mL, the leaching time is 0.5-2 h, and the stirring speed is 250-500 rpm.

Technical Field

The invention belongs to the field of nonferrous metallurgy, and particularly relates to a method for desiliconizing silicon-containing ores or slags.

Background

At present, a plurality of metallurgical original ores and leaching slag contain a certain amount of silicon, wherein the silicon exists in the form of silicon dioxide and silicate, the quality of minerals is not high due to the existence of the silicon, the existence of the silicon must be considered in the mineral processing process, the technical difficulty and the processing cost of mineral utilization are further increased, and a general and efficient method for removing the silicon does not exist at present. Patent CN 105734265A proposes a method for removing silicon from molybdenum concentrate, in which sodium carbonate is mixed and ground with molybdenum concentrate. The method can well remove the silicon in the molybdenum concentrate, but has high energy consumption and low silicon removal rate. The patent CN 107857489A adopts an activating roasting reselection process for the magnesite to carry out desiliconization, and the process has a good removing effect on the silicon dioxide with larger granularity in the magnesite, but has a poor removing effect on the silicon dioxide with smaller granularity and other silicates, and has a long flow path and complex operation.

In conclusion, no generally applicable method for removing silicon from the original ore and the leached slag containing silicon is available at present, the efficient removal of silicon cannot be realized, and the defects of high energy consumption, long flow, complex operation and the like exist. The invention provides a method for removing silicon from silicon-containing ores or slags, which is characterized in that silicon is activated and transformed by utilizing the strong oxidizing property of nitric acid pressurization, and then the silicon in the silicon-containing ores or slags is effectively removed by utilizing phosphoric acid pretreatment and water immersion.

Disclosure of Invention

The invention provides a method for removing silicon from silicon-containing ores or slags, which comprises the steps of transforming silicon by utilizing the strong oxidizing property of nitric acid pressurization activation, then utilizing phosphoric acid for pretreatment, water leaching and drying to obtain the desilication slag.

The purpose of the invention is realized by the following technical scheme:

a method of desiliconizing a silicon-containing ore or slag comprising the steps of:

step one, nitric acid activation transformation: adding nitric acid with a certain concentration into the silicon-containing ore or slag, carrying out activation transformation, and carrying out liquid-solid separation on the transformed ore pulp to obtain leachate and activated slag;

step two, pretreatment of phosphoric acid: adding phosphoric acid into the activated slag obtained in the first step according to a certain solid-to-liquid ratio, fully stirring, and placing in a muffle furnace to complete pretreatment;

step three, water leaching and desiliconization: and (4) leaching the pretreated material in the step two by using hot water for desiliconization, and then carrying out solid-liquid separation to realize the removal of silicon in the silicon-containing ore or slag.

Further, during the activation transformation of nitric acid in the first step, the concentration of nitric acid is 150-300 g/L, the solid-to-liquid ratio is 1: 2-1: 5g/mL, the leaching temperature is 180-220 ℃, the leaching time is 1-4 h, and the stirring speed is 350-600 rpm.

Further, in the step of phosphoric acid pretreatment, 85% phosphoric acid is mixed with the leaching residue according to the solid-to-liquid ratio of 2: 1-1: 2 g/mL.

Further, the temperature is 220-260 ℃ and the time is 0.5-2 h during the phosphoric acid pretreatment in the step.

Further, when the water leaching desiliconization is carried out in the third step, the water leaching temperature is 60-90 ℃, the solid-to-liquid ratio is 1: 2-1: 5g/mL, the leaching time is 0.5-2 h, and the stirring speed is 250-500 rpm.

According to the technical scheme provided by the invention, the method for desiliconizing the silicon-containing ores or slag provided by the embodiment of the invention has the advantages of short flow, easiness in operation and capability of efficiently removing silicon.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow diagram of the present invention for desilication from silicon-containing ores or slags.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.

The process of the present invention for desiliconizing siliceous ores or slags is described in detail below.

A process for the desilication of silicon-containing ores or slags, comprising the steps of:

step one, nitric acid activation transformation: adding nitric acid with initial acidity of 150-300 g/L into certain siliceous slag, wherein the solid-to-liquid ratio is 1: 2-1: 5g/mL, and controlling the reaction conditions: leaching at the temperature of 180-220 ℃, leaching time of 1-4 h, and stirring at the rotating speed of 350-600 rpm, completing liquid-solid separation of activated ore pulp, and obtaining leachate and activated slag.

Step two, pretreatment of phosphoric acid: adding 85% phosphoric acid into the leaching residue obtained in the first step according to a solid-to-liquid ratio of 2: 1-1: 2g/mL, fully stirring, and placing in a muffle furnace at 220-260 ℃ for pretreatment for 0.5-2 h.

Step three, water leaching and desiliconization: and (3) placing the pretreated material in the second step into hot water at the temperature of 60-90 ℃, wherein the solid-to-liquid ratio is 1: 2-1: 5g/mL, the leaching time is 0.5-2 h, and the stirring speed is 250-500 rpm. And (4) carrying out solid-liquid separation and drying to obtain the desiliconized slag.

The technical scheme shows that: the invention provides a method for desiliconizing from silicon-containing ores or slag, which comprises the steps of pressurizing, activating and transforming by nitric acid, then converting insoluble silicon into soluble substances by utilizing phosphoric acid pretreatment, and finally removing silicon by water immersion.

The method for desiliconizing from the silicon-containing ore or slag provided by the invention has the following advantages:

(1) the method for desiliconizing from the silicon-containing ore or slag adopts nitric acid to perform pressure activation transformation, and has low cost and simple operation.

(2) The invention realizes the conversion of insoluble silicon into soluble substances by the pretreatment of phosphoric acid, and removes the silicon by simple water immersion.

(3) The invention fully utilizes the characteristics of silicon and efficiently removes the silicon from the silicon-containing ores or slag.

(4) The invention has the advantages of no alkali in the whole process, less reagent consumption, simple operation, short process and small pressure on the environment.

In order to more clearly show the technical scheme and the technical effects provided by the invention, the method for desiliconizing the silicon-containing ore or slag provided by the invention is described in detail by using specific examples.