阅读说明：本技术 一种高铁黑钨原矿的综合回收方法 (Comprehensive recovery method of high-iron wolframite raw ore ) 是由 周群 季光明 程润喜 胡芳 邹迪 周欢 于 2020-06-22 设计创作，主要内容包括：本发明公开了一种高铁黑钨原矿的综合回收方法。本发明的一种高铁黑钨原矿的综合回收方法,将高铁黑钨原矿利用磷酸溶液进行酸浸处理,对反应体系进行加压,同时提高反应体系的温度,反应结束后,得到磷酸铁酸解渣和含钨的酸解液。本发明的高铁黑钨原矿中的钨在磷酸的络合作用下进入溶液而铁转化为磷酸铁沉淀,实现了矿石中钨与铁的分离,酸解渣中的主要成分为磷酸铁,经提纯后可作为原料供电池行业及陶瓷行业使用,增加了产品的附加值,提高了本发明的经济效益,本发明有效地阻止了钨酸膜对颗粒表面的覆盖,极大地提高了钨的酸解效率。(The invention discloses a comprehensive recovery method of high-iron wolframite raw ore. The invention relates to a comprehensive recovery method of high-iron wolframine oxide raw ore, which comprises the steps of carrying out acid leaching treatment on the high-iron wolframine oxide raw ore by using a phosphoric acid solution, pressurizing a reaction system, simultaneously increasing the temperature of the reaction system, and obtaining iron phosphate acid hydrolysis slag and acid hydrolysis liquid containing tungsten after the reaction is finished. According to the invention, tungsten in the high-iron wolframine black ore enters the solution under the complexing action of phosphoric acid, and iron is converted into iron phosphate precipitate, so that the separation of tungsten and iron in the ore is realized, the main component in acidolysis slag is iron phosphate, and the iron phosphate can be used as a raw material for the battery industry and the ceramic industry after purification, so that the added value of the product is increased, the economic benefit of the invention is improved, the invention effectively prevents the tungstic acid film from covering the particle surface, and the acidolysis efficiency of tungsten is greatly improved.)

1. A comprehensive recovery method of high-iron wolframite raw ore is characterized by comprising the following steps: carrying out acid leaching treatment on the high-iron wolframite raw ore by using a phosphoric acid solution, pressurizing a reaction system, simultaneously increasing the temperature of the reaction system, and obtaining iron phosphate acid hydrolysis residues and an acid hydrolysis solution containing tungsten after the reaction is finished.

2. The comprehensive recovery method of high-iron wolframite ores as claimed in claim 1, characterized in that: the concentration of the phosphoric acid solution is 10-30%, the pressure of a reaction system is 0.1-1.5 MPa, and the temperature of the reaction system is 100-150 ℃.

3. The integrated recovery method of high-iron wolframite ores as set forth in claim 1 or 2, characterized in that: WO of the high-iron wolframite raw ore₃The grade of (A) is 0.1-2%.

4. The comprehensive recovery method of high-iron wolframite ores as claimed in claim 3, characterized in that: the grade of iron in the high-iron wolframite raw ore is 20-50%.

5. The integrated recovery method of high-iron wolframite ores as set forth in claim 4, characterized in that: the volume-mass ratio of the phosphoric acid solution to the high-iron wolframite raw ore is 1-10 mL/g.

6. The comprehensive recovery method of high-iron wolframite ores as claimed in claim 2, characterized in that: the temperature of the reaction system is 100-120 ℃.

7. The comprehensive recovery method of high-iron wolframite ores as claimed in claim 2, characterized in that: the acid leaching time is 0.5-12 h.

8. The comprehensive recovery method of high-iron wolframite ores as claimed in claim 7, characterized in that: the time of the acid leaching treatment is 1-3 h.

9. The comprehensive recovery method of the high-iron wolframite raw ore according to claim 1, characterized in that: the particle size of the high-iron wolframite raw ore is not more than 250 mu m.

Technical Field

The invention relates to the technical field of tungsten ore recovery, in particular to a comprehensive recovery method of high-iron wolframite raw ore.

Background

China is the country with the most abundant tungsten resource reserves, but the tungsten resource grade of China is low, and the target mineral scheelite or wolframite needs to be enriched through a complex mineral separation process. The wolframite beneficiation process mainly uses gravity separation, part of the beneficiation processes select magnetic separation or flotation process, and the scheelite beneficiation mainly uses flotation. And (4) smelting the tungsten concentrate obtained by mineral separation to obtain a tungsten target product.

Compared with scheelite concentrate, the smelting process of the wolframite concentrate is relatively simple, the traditional treatment process mostly adopts methods such as NaOH leaching or water leaching after soda sintering, and the like for treatment, and the main component of the scheelite is CaWO₄The main smelting process of scheelite is soda ash pressure boiling method, alkali dissolution after hydrochloric acid decomposition, and then NaOH alkali pressure boiling method is extended on the basis of wolframite NaOH decomposition method, the high alkali and high pressure of scheelite decomposition has large requirements and loss on reaction equipment, and the production cost is high, therefore, Chinese invention patents 201010605095.1, 201010605107.0, 201010605103.2 and 201010605110.2 propose a novel method for sulfuric acid-phosphoric acid synergistic decomposition of scheelite, which greatly improves the decomposition efficiency of scheelite and simultaneously reduces the production cost, however, the method has problems in handling wolframite, the structure of wolframite is more compact and is difficult to react with acid, and the tungsten grade in tungsten concentrate is high, and tungstic acid film is easily generated to cover the surface of the scheelite in the reaction process to prevent the acid from reacting with the scheelite, therefore, other solutions are proposed in Chinese patents 201510243382.5, 201510241154.4, 201510242275.0 and 201710313207.8, the principle is approximately the same, and the wolframite is converted into scheelite under certain conditions, and then is synergistically decomposed by the mixed sulfuric acid and phosphoric acid.

The research that above patent goes on tungsten ore is based on the tungsten concentrate of ore dressing enrichment as the raw materials, and direct processing tungsten ore raw ore can cause a large amount of acid losses, and impurity ion in the raw ore gets into behind the solution simultaneously, can carry tungsten to subsequent edulcoration and cause adverse effect. There has therefore been little research into the direct extraction of tungsten from raw tungsten ore by smelting processes and to obtain beneficial iron-containing products.

The high-iron wolframite in Yunnan is an ore with complex occurrence state, fine embedded granularity, large mud content and large mineral separation difficulty, a detailed mineral separation test is carried out on the high-iron wolframite raw ore in Yunnan, the effect of the common gravity and floatation method on the refractory ore is not obvious no matter in a single flow or a combined flow, and a roasting-weak magnetic-gravity separation flow is adopted, and the result shows that the process has more sufficient recovery on limonite but has lower recovery rate of the wolframite, so the mineral separation engineering is difficult to separate and recover the ore efficiently.

Disclosure of Invention

The invention aims to provide a comprehensive recovery method of high-iron wolframine and wolframine raw ore, which has simple flow, low cost and good separation effect, aiming at the defects in the prior art.

The invention relates to a comprehensive recovery method of high-iron wolframine oxide raw ore, which comprises the steps of carrying out acid leaching treatment on the high-iron wolframine oxide raw ore by using a phosphoric acid solution, pressurizing a reaction system, simultaneously increasing the temperature of the reaction system, and obtaining iron phosphate acid hydrolysis slag and acid hydrolysis liquid containing tungsten after the reaction is finished.

Further, the concentration of the phosphoric acid solution is 10% -30%, the pressure of a reaction system is 0.1-1.5 MPa, the temperature of the reaction system is 100-150 ℃, and the volume-mass ratio of the phosphoric acid solution to the high-iron wolframite raw ore is 1-10 mL/g.

Further, the volume-mass ratio of the phosphoric acid solution to the high-iron wolframite raw ore is 3-8 mL/g.

Further, the temperature of the reaction system is 100-120 ℃.

Further, the acid leaching time is 0.5-12 h.

Further, the acid leaching time is 1-3 h.

Further, the WO of the high-iron wolframite raw ore₃The grade of (A) is 0.1-2%.

Further, the grade of iron in the high-iron wolframite raw ore is 20% -50%.

Further, the particle size of the high-iron wolframite raw ore is not more than 250 μm.

In the original dressing and smelting technology, the dressing process is taken as a concentrate enrichment process before smelting, and always occupies an important position of metal extraction, and the direct smelting from raw ore is regarded as a metal smelting method with high cost and low benefit.

In order to realize the high-efficiency separation of iron and tungsten in raw ore, the inventor creatively uses the raw ore as a raw material for wet smelting, avoids a complex ore dressing enrichment process, uses phosphoric acid as an acidolysis agent of the raw ore in the process, but finds that the raw ore has stable properties in the test process, the decomposition effect of the raw ore is poor and the reaction rate is slow, and the tungsten and the iron in the raw ore are difficult to separate under the conditions of normal pressure and normal temperature, therefore, the reaction process is pressurized to improve the temperature of a reaction system to be 100-120 ℃, and through deep research, the pressurization phosphoric acid hydrolysis not only greatly improves the reaction efficiency, but also solves the coverage problem of a tungstic acid film in the raw ore, more unexpectedly converts limonite in the raw ore into iron phosphate, improves the selective separation effect of tungsten, and realizes the one-step high-efficiency separation of the iron and the tungsten.

The invention can overcome the problems of fine embedded particle size and large mud content of the tungsten ore raw ore, directly processes the tungsten ore raw ore, omits a complicated and high-cost ore dressing enrichment process, releases associated tungsten when the limonite is decomposed, has low tungsten grade in the raw ore compared with acidolysis of tungsten ore concentrate, and is not easy to form glue yellow tungstic acid in the process.

According to the invention, tungsten in the high-iron wolframite raw ore enters the solution under the complexing action of phosphoric acid, and iron is converted into iron phosphate precipitate, so that the separation of tungsten and iron in the raw ore is realized, the main component in acidolysis slag is iron phosphate, and the iron phosphate can be used as a raw material for the battery industry and the ceramic industry after purification, so that the added value of the product is increased, and the economic benefit of the invention is improved.

The pressure treatment used in the invention has obvious advantages with the existing high-pressure leaching process, and the optimal temperature required by the reaction is 100-120 ℃, while the temperature of the existing high-pressure acid leaching system is maintained in the range of 180-250 ℃, so the requirement of the invention on equipment is far lower than that of the existing high-pressure acid leaching process.

Detailed Description

The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.