The role and production of sodium sulfide in mineral processing

1. Sodium sulfide is applied in flotation

Sodium sulfide (Na2S) is a commonly used agent in the flotation of sulfide ore. Its main functions are as follows:

1. Sodium sulfide is the inhibitor of most sulfide minerals.

When used in large amounts, it inhibits most of the sulfide ore. It inhibits descending order of sulfide ore is roughly: galena, sphalerite, yellow copper ore, bornite, covellite, pyrite, chalcocite. Since molybdenum ore is naturally floatable, sodium sulfide cannot inhibit it. Using this, when flotation molybdenite is used, Na2S can be used to suppress other sulfide ore.

Second, the vulcanizing agent is sodium sulfide ferrous metal oxide ores

Non-ferrous metal oxides cannot be directly collected by xanthate. However, if sodium sulfide and non-ferrous metal oxidized ore are added before the yellow medicine flotation, a film of sulfide ore can be produced on the surface of the mineral, and the yellow medicine can be harvested. This action of sodium sulfide is called vulcanization, so it can be used as a vulcanizing agent for non-ferrous metal oxides.

After the action of white lead ore and sodium sulfide, the surface color changes from white to dark. After the action of malachite and sodium sulfide, the surface color changes from green to dark, indicating that after vulcanization, the sulfide surfaces of the two minerals are different from those of minerals.

3. Sodium sulphide is a drug for the separation of sulfide ore concentrates.

When the amount of sodium sulfide is large, the xanthate collector which adsorbs the surface of the mineral can be analyzed. Therefore, sodium sulfide can be used as a de-agent before separation of the concentrate. For example, before the separation of lead-zinc mixed concentrate or copper-lead mixed concentrate, the slurry can be concentrated, a large amount of sodium sulfide is added to remove the drug, and then washed, and fresh water is added again to adjust the slurry and then subjected to separation and flotation.

In addition to the above three main functions, since sodium sulfide can form insoluble sulfide precipitates with many metal ions, sodium sulfide also has the effect of eliminating some ions harmful to flotation in the slurry.

Second, the production process of sodium sulfide

A granular sodium sulfide production process comprising the steps of raw material-calcination-hot melt-refining washing-chemical decontamination-precipitation-evaporation concentration, storing the concentrated sodium sulfide solution in a reactor or a stirrer, and sodium sulfide The content is ≥60%, pumped out by the pump, the impurities are filtered through the filter, the temperature of the sodium sulfide solution entering the granulator is 130-150 ° C, the delivery pressure is 0.3-0.5 MPa, and the nozzle is sprayed through the nozzle, in the steel strip cooler The upper part is cooled and formed, and the solidified particles are discharged into the feeder, and the vacuum packaging or the plastic bag is sealed and packaged, that is, the finished product is obtained.

Sodium sulfide production process

A granular sodium sulfide production process comprising the steps of raw material-calcination-hot melt-refining washing-chemical decontamination-precipitation-evaporation concentration, storing the concentrated sodium sulfide solution in a reactor or a stirrer, and sodium sulfide The content is ≥60%, pumped out by the pump, the impurities are filtered through the filter, the temperature of the sodium sulfide solution entering the granulator is 130-150 ° C, the delivery pressure is 0.3-0.5 MPa, and the nozzle is sprayed through the nozzle, in the steel strip cooler The upper part is cooled and formed, and the solidified particles are discharged into the feeder, and the vacuum packaging or the plastic bag is sealed and packaged, that is, the finished product is obtained. The above granular sodium sulfide production process is reasonable in design and advanced in technology. According to the unique physical properties of the sodium sulfide concentrate, the granulation process conditions and granulation equipment are provided, and the sodium sulfide product is granulated, and the vacuum packaging technology is applied and effectively It prevents the deliquescence and oxidation of sodium sulfide products, thus prolonging the inventory time. Granular products can be automated packaging systems to reduce labor intensity, improve the working environment and reduce packaging costs.

1. A granular sodium sulfide production process comprising a raw material process - a calcination process - a hot melt process - a clarification process - a chemical removal process - a precipitation process - an evaporation concentration process, characterized by evaporation The concentrated sodium sulfide solution, sodium sulfide content ≥60%, pumped out by the pump, the impurities are filtered through the filter, the temperature of the sodium sulfide solution entering the granulator head is 130-150 ° C, the delivery pressure is 0.3-0.5 MPa, The nozzle of the machine head is sprayed out and cooled and formed on the steel strip cooler. The solidified particles are discharged into the feeder, and the vacuum packaging or the plastic bag is sealed and packaged, that is, the finished product is obtained.

Method for preparing anhydrous and high-purity sodium sulfide [CN25049-0013-0001]

[Abstract] The present invention relates to a method for preparing anhydrous, high-purity sodium sulfide, which has a Na2S content of at least 98 wt.% by drying aqueous sodium sulfide by using aqueous sodium sulfide and water-immiscible. The organic solvent is heated together to a temperature below the melting point of the aqueous sodium sulfide at 10-20 ° C; then stepwise heating, each stage is heated 1-10 ° C, and held for 5-15 minutes, until 10-20 ° C above the melting point of aqueous sodium sulfide Heating is continued to the boiling point of the water-solvent mixture, azeotropic distillation under vacuum or pressure, and the water of crystallization is distilled off.

Preparation method of anhydrous sodium sulfide crystal [CN25049-0012-0004]

[Abstract] The present invention relates to a method for preparing crystals of anhydrous sodium sulfide, which is added to aid sodium reduction process of pulverized coal preparation of crystalline sodium sulfide solution to remove impurities, was prepared containing nine crystal water or crystal 5.5 The sodium sulfide crystals of water are then dried by heating under reduced pressure, which is characterized by a close relationship between the drying temperature and the pressure, thereby preventing the hydrate from coalescing or sticking to the dryer. The anhydrous sodium sulfide crystal obtained by the method has the characteristics of high purity, large specific surface area and uniform particles, and can fully meet the requirement of the quality of anhydrous sodium sulfide in the synthesis of polyphenylene sulfide (pps).

Preparation method of sodium sulfide crystal [SY25049-0001-0005]

[Abstract] The present invention relates to a method for preparing Na2S·5.5H2O, sodium sulfide crystals and a method for preparing anhydrous sodium sulfide crystals by using Na2S·5.5H2O sodium sulfide crystals. The method comprises the steps of adding an auxiliary agent to a sodium sulfide solution prepared by a pulverized coal reduction sodium sulfate process to remove impurities, and then crystallizing under certain conditions to obtain a sodium sulfide crystal containing 5.5H2O, wherein the crystal is a non-oxidizing gas under normal pressure. Heating, which is characterized by controlling the temperature and pressure of the gas to prevent the hydrate from binding, while the moisture is carried away by the gas. The anhydrous sodium sulfide crystal obtained by the method has the characteristics of high purity, large specific surface area and uniform particles.

Production method of high-purity crystalline sodium sulfide [SY25049-0029-0007]

[Abstract] The invention discloses a method for producing high-purity crystalline sodium sulfide and by-product paper iron sulfide. The invention comprises the following steps: using strontium sulfide calcined material as raw material, leaching, acid decomposing liquid to prepare H2S and purifying it, and then obtaining sodium sulfide solution by ionic membrane caustic absorption reaction, then concentrating by evaporation, cooling and crystallization, and centrifuging to obtain high Purity colorless crystalline sodium sulfide product; the mother liquor after centrifugation is concentrated by evaporation and cooled to obtain solid low-iron sodium sulfide. The invention has a wide source of raw materials, and the strontium and sulfur elements contained in the raw materials can be utilized separately, and the ionic membrane caustic soda absorption reaction can effectively improve the purity thereof, and the production cost is 40-50% lower than the background technology. Therefore, the process flow is simple and reliable, the crystalline sodium sulfide produced is a high-purity colorless crystal, and the Fe content of the low-iron sodium sulfide by-product is ≤20PPm, the comprehensive utilization of raw materials is high, and the production cost and the economic benefit are significantly reduced.

Preparation method of anhydrous sodium sulfide crystal [FW25049-0012-0010]

[Abstract] The present invention relates to a method for preparing anhydrous sodium sulfide crystals, which comprises adding an auxiliary agent to a sodium sulfide solution prepared by a pulverized coal reduction sodium sulfate process to remove impurities and crystallizing, and obtaining 9 crystal water or 5.5 crystals. The sodium sulfide crystals of water are then dried by heating under reduced pressure, which is characterized by a close relationship between the drying temperature and the pressure, thereby preventing the hydrate from coalescing or sticking to the dryer. The anhydrous sodium sulfide crystal obtained by the method has the characteristics of high purity, large specific surface area and uniform particles, and can fully meet the requirement of the quality of anhydrous sodium sulfide in the synthesis of polyphenylene sulfide (pps).

Sodium sulfide refining process [CM25049-0004-0002]

[Abstract] The invention relates to a production process of sodium sulfide, which is a sodium sulfide refining process, the process is as follows: coal and anhydrous thenardite are mixed and calcined to form a crude alkali, and then cooled to obtain the first concentrated alkali solution, which is characterized in that 4 to 8 kg of iron remover is added to the first concentrated alkali solution per cubic meter, and the temperature of the alkali solution is controlled at 50 ° C to 100 ° C, preferably 65 ° C to 85 ° C. After stirring, the settling time is not less than 4 hours. Further solid-liquid separation is carried out to obtain a refining lye; the process is simple, the environmental pollution is small, the finished product is not only low in iron content, but also the content of impurities such as sodium carbonate, sodium chloride, sodium thiosulfate or sodium sulfite is low.

Process for producing low-iron sodium sulfide [CM25049-0005-0006]

[Abstract] The present invention relates to a method for producing low-iron sodium sulfide (sulphide) by improving the pulverized coal reduction sodium sulfate process. The method of the invention comprises the steps of adding a de-ironing agent, barium sulfide, removing iron and other impurities, and then treating and evaporating and concentrating in a concentrated brine containing sodium sulfide (crude alkali) after calcination and water leaching. The low-iron sodium sulfide, which contains less than 0.008% iron, can fully meet the needs of producing high-grade refined products in the leather, dyeing, papermaking and other industries in modern industrial production.

Method for producing sodium sulfide by glauberite [CM25049-0008-0007]

[Abstract] A method for producing sodium sulfide from glauberite ore is carried out according to the following steps: (1) uniformly mixing the glauberite powder with the coal powder, and letting the ratio of sulfate to carbon in the obtained mixture be 5 : 1 to 5:3, calcined at a high temperature of 900 to 1300 ° C for 20 to 2 minutes and then discharged from the furnace; (2) with 10 to 45% sodium sulfate containing sodium sulfate at 50-150 ° C leaching was the above-prepared 2 to 6 hours, equivalent to sodium sulfate as Glauber's salt contained in the water leaching of the above preparation was calcium sulfide, magnesium sulfide, strontium sulfide total equivalent of 100 to 102%; (3), filtered off The supernatant in the obtained immersion liquid is taken up and concentrated by evaporation to obtain a finished sodium sulfide.

Method for continuously producing sodium sulfide by evaporation can [FW25049-0010-0003]

The invention is a method for continuously producing sodium sulfide by using an evaporation can, and belongs to the field of chemical industry. The method adds the raw material nitrate and the pulverized coal to the converter, generates black ash, and then adds hot water to obtain the alkali liquid, and obtains the clear alkali liquid by refining (ie, filtering), and sends the clear alkali liquid to the external heat type forced circulation evaporation tank for high. Low concentration evaporation, so that the sodium sulfide content can reach 60%. The method overcomes the shortage of using sodium sulfide in the pot, that is, the method can be continuously produced, the energy consumption is low, the cost is reduced, and the environment is not polluted.

Sodium sulfide solution evaporation concentrating device [FW25049-0018-0009]

[Abstract] The utility model relates to an evaporation concentration device in the process of producing sodium sulfide, in particular to an evaporation concentration device in the process of producing sodium sulfide, comprising a container body for containing a liquid chamber to be concentrated liquid, which is characterized in that The container body is provided with a heating passage including an inlet and an outlet and penetrating through the liquid chamber of the container body, and the heating channel and the liquid chamber of the container body are sandwich structures capable of filling the heat conductive medium. Compared with the prior art, the utility model has the advantages of simple structure, convenient operation, less power configuration, large metal material saving and cost, high heat transfer efficiency and uniform heat conduction, and can effectively prevent local high temperature from forming heat exchange surface deformation, Corrosion, the lower part of the evaporation chamber can be made into a cone, and the salt foot can continuously separate the double salt impurities, which can effectively improve product quality, maintenance cost and low running cost, and has a salt foot to separate the evaporation and concentration process. Double salt impurities to further improve product quality.

Nine water sodium sulfide vacuum dehydration dryer [CM25049-0017-0010]

[Abstract] The utility model provides a novel nine-water sodium sulfide vacuum dehydration dryer, which has a body, and a feeding valve and a discharging valve and a drawing steaming pipe are arranged on the body. The utility model is characterized in that a heating interlayer formed by a casing is connected outside the cylinder of the body, an oil inlet pipe and an oil outlet pipe are arranged on the heating interlayer, and a stirring shaft is arranged in the cylinder of the body body, and the left and right spiral heating and stirring are connected to the stirring shaft. The coil tube and the two ends of the stirring shaft are hollow and communicate with the rotating joint head, and the stirring shaft is connected with the transmission mechanism, and a scraper is connected to the spiral heating stirring coil, and the both ends of the stirring shaft are filled with expanded graphite for radial sealing. .

Granular sodium sulfide production process [A29078-0024-0008]

[Abstract] A granular sodium sulfide production process, including raw material - calcination - hot melt - clarification washing - chemical impurity removal - precipitation - evaporation concentration process, the concentrated sodium sulfide solution is stored in the reactor or agitator , sodium sulfide content ≥ 60%, pumped out by the pump, the impurities are filtered through the filter, the temperature of the sodium sulfide solution entering the granulator is 130-150 ° C, the delivery pressure is 0.3-0.5 MPa, and the nozzle is sprayed through the nozzle. Cooling molding with a cooler, the solidified particles are discharged into the feeder, and the vacuum packaging or the plastic bag is sealed and packaged, that is, the finished product is obtained. The above granular sodium sulfide production process is reasonable in design and advanced in technology. According to the unique physical properties of the sodium sulfide concentrate, the granulation process conditions and granulation equipment are provided, and the sodium sulfide product is granulated, and the vacuum packaging technology is applied and effectively It prevents the deliquescence and oxidation of sodium sulfide products, thus prolonging the inventory time. Granular products can be automated packaging systems to reduce labor intensity, improve the working environment and reduce packaging costs.

Conveyor belt for sodium sulfide granulation [SY25049-0019-0004]

[Abstract] The utility model belongs to the molding technology of a compound, in particular to a conveyor belt for sintering of sodium sulfide. It is provided with a layer of fluoropolymer film on the metal base tape. The sodium sulfide droplets do not spread when they fall on the fluoropolymer film, but shrink into a hemispherical shape, which becomes a hemispherical particle after condensation, and can be easily detached from the conveyor belt without labor, thereby solving the sodium sulfide. It is not easy to fall off from the existing conveyor belt.

Sodium sulfide packaging process method [FW25049-0003-0001]

[Abstract] The present invention is a sodium sulfide packaging process. $ This packaging process removes the traditional iron drum packaging and uses a plastic bag to seal the package. In order to adapt to the new packaging, the concentrated sodium sulfide solution is injected into the iron mold during the steaming process of sodium sulfide production. Immerse in a cooling pool for cooling, condense into a solid and then demould. The formed sodium sulfide solid is sealed and packaged in a plastic woven bag lined with plastic bags. The advantage is that the process is simple, the sodium sulfide is not easy to absorb moisture and deteriorate; the volume is small. Light weight, easy to handle, transport and use, can improve the utilization of the warehouse; save steel, can save 30 to 50% of packaging costs.

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