31 results about "Pyritic sulfur" patented technology

A method of recovering copper from a copper sulfide concentrate comprising a copper arsenic sulfosalt or a copper antimony sulfosalt, using pyrite as a catalyst. The concentrate and pyrite are added to an acidic sulfate leach solution. The copper is leached from the concentrate, in the presence of an oxygen-containing gas, under conditions whereby the pyrite is substantially unoxidized. The pyrite:copper sulfide ratio of the pyrite being added to the copper sulfide present in the concentrate being added is at least 1:3. The pyrite may be maintained at a concentration in the leach solution of at least 9 grams per liter. The leached copper is recovered from the solution by conventional methods.

A method is provided for characterizing and quantifying the pyritic sulfur and the organic sulfur separately in a sedimentary rock sample. A rock sample is subjected to a heating process in an inert atmosphere, the effluents resulting from the heating in the inert atmosphere are continuously oxidized, the released SO2 is continuously measured, and a pyrolysis sulfur content and a pyrolysis pyriticsulfur content are deduced. The residue heated in the inert atmosphere is heated in an oxidizing atmosphere, the released SO2 is continuously measured, and at least oxidation sulfur content is deduced therefrom. The pyritic sulfur content is determined from the pyritic pyrolysis sulfur content and a weighting function taking account of a first parameter representing a thermal degradation rate ofthe pyrite, a second parameter representing the impact of the mineral matrix, and a third parameter representing the impact of the organic matrix. In addition, the organic sulfur content can be determined from at least the oxidation sulfur content, the pyrolysis sulfur content and the pyritic sulfur content. Application: in particular to oil exploration and exploitation.

The invention discloses a pyrite nano mineral material and a preparation method thereof. The pyrite nano mineral material uses pyritic sulfur and sulphide concentrate as raw materials, the mass percent of pyrite in the pyritic sulfur is not smaller than 50%, and the mass percent of the pyrite in the sulphide concentrate is not smaller than 90%. The preparation method comprises the following stepsof: crushing pyritic sulfur ores, sieving with a sieve of 100 meshes to obtain powder or directly selecting the sulphide concentrate with the particle diameter which is smaller than 0.165mm as powder, adding a bonder to the powder, pelletizing and molding to obtain particles with the particle diameter of 1-3mm, calcinating the particles at a temperature of 500-1000DEG C for 0.5-30min under anaerobic conditions, separating gas from solids, condensating the gas, recovering sulfur, and cooling the solids under oxygen isolation conditions to a room temperature to obtain a finished product. The material has the advantages of large specific area, strong magnesium, high chemical reaction activity, simple preparation technology, low cost and wide raw material resources.

The invention discloses a three-dimensional balanced electric field decomposition tank and a pre-desulphurization process of coals in the absence of acid-alkali medium. According to the three-dimensional balanced electric field decomposition tank, two comb-shaped electrode plates are arranged in the decomposition tank in a balanced manner, and a conventional planar electric field is three-dimensional, so as to ensure that the molecule at any point in the decomposition tank can be ionized by constant force and greatly improve the decomposition efficiency. The invention further provides a set of process for coals to perform desulphurization by utilizing the three-dimensional balanced electric field decomposition tank in the absence of acid-alkali medium, so that pyritic sulfur can realize decomposition / aggregation in a neutral medium so as to achieve the purpose of polarization desulfurization, the desulfurization efficiency is high, the pollution is avoided, the sulfur aggregated on the electrode plates can further be recycled and processed into by-products. The three-dimensional balanced electric field decomposition tank and the three-dimensional balanced electric field pre-desulphurization process can be used for coal desulphurization and can further be applied to other electrochemical industry fields.

The invention discloses a three-dimensional balanced electric field decomposition tank and a pre-desulphurization process of coals in the absence of acid-alkali medium. According to the three-dimensional balanced electric field decomposition tank, two comb-shaped electrode plates are arranged in the decomposition tank in a balanced manner, and a conventional planar electric field is three-dimensional, so as to ensure that the molecule at any point in the decomposition tank can be ionized by constant force and greatly improve the decomposition efficiency. The invention further provides a set of process for coals to perform desulphurization by utilizing the three-dimensional balanced electric field decomposition tank in the absence of acid-alkali medium, so that pyritic sulfur can realize decomposition / aggregation in a neutral medium so as to achieve the purpose of polarization desulfurization, the desulfurization efficiency is high, the pollution is avoided, the sulfur aggregated on the electrode plates can further be recycled and processed into by-products. The three-dimensional balanced electric field decomposition tank and the three-dimensional balanced electric field pre-desulphurization process can be used for coal desulphurization and can further be applied to other electrochemical industry fields.

The invention provides a method for performing in situ treatment on acid water of a mine by using crop seed husks. The method comprises the steps that an acid generation point or a fissure surface where the acid water seeps in a mine shaft is detected; a biological inhibitor and alkali flocculation mixed liquor are prepared; the surface of the acid water of the mine shaft is sprayed by the biological inhibitor or subjected to brushed in batch; and continuous seepage of the acid water in the shaft can be eliminated by spraying the alkali flocculation mixed liquor onto an inhibitor layer at intervals for 1-3 times finally. According to the method, the oxidative activity of acidophilic bacteria in an acid water generation environment is inhibited by the biological inhibitor, generation of the acid water is slowed down or inhibited, and the alkali flocculation mixed liquor is used for spraying continuously to form ferric oxide or ferric hydroxide flocculent settling to form a protective film on the surface of pyritic sulfide, so that the acid water generated due to biological and chemical oxidation of sulfur-bearing minerals is avoided completely. The method has the advantages that waste is recycled, neither poison nor secondary pollution to an environment is caused, and the method is low in cost and simple to apply and operate.

A rock sample is subjected to a heating sequence in an inert atmosphere, the effluents resulting from this heating are oxidized, the hydrocarbon-based compounds, the CO, the CO2 and the SO2 released are measured, and a pyrolysis pyritic sulfur content is deduced therefrom. The residue resulting from the heating in an inert atmosphere is then heated in an oxidizing atmosphere and the CO and the CO2 released are measured. The pyritic sulfur content is determined at least from the pyrolysis pyritic sulfur content and from a parameter which is a function of the hydrogen content and of the oxygen content of the organic matter of the sample. It is also possible to determine the organic sulfur content from the pyritic sulfur content and from a measurement of the SO2 during the heating sequence in an oxidizing atmosphere.

The invention provides a device for extracting pyritic sulfur contained in a geological sample. The device comprises a nitrogen gas path unit, a CrCl2 gas preparation unit, a sample reaction unit and a gas absorption unit, wherein a reaction vessel inside the sample reaction unit is arranged on a heating type magnetic stirrer, and the reaction vessel is provided with a liquid inlet, a gas inlet and a gas outlet; a condensation pipe inner pipe is arranged above the gas outlet through a porous glass stopper, a condensation pipe outer pipe is wound outside the condensation pipe inner pipe; a separating funnel B and a separating funnel A are respectively communicated with the reaction vessel through sampling pipes which correspond to the separating funnel B and the separating funnel A and a sampling port; the sampling pipes are both inserted into the sampling port; a nitrogen cylinder inside the nitrogen gas path unit is communicated with the reaction vessel through a vent pipe and the gas inlet and communicated with the separating funnel B after being connected with the upper part of the separating funnel B through a two-port type gas-distributing pipe; and the gas absorption unit comprises a round-bottomed flask, a surge flask, a gas absorption test tube and a tail gas absorption bottle which are sequentially communicated through a pipeline. The device provided by the invention can effectively extract the pyritic sulfur contained in the geological sample and has the characteristics of economy, easiness, convenience and environmental friendliness.

The invention discloses a flue gas desulfurization technology through an additive enhanced coal slurry method, and belongs to the technical field of flue gas cleaning. The technology comprises the steps that coal powder or coal slime is prepared into a slurry liquid with water; at least one of aluminum ash, aluminum, aluminum oxide and aluminum sulfate is added to the slurry liquid and serves as an enhancing additive for washing flue gas containing sulfur dioxide; sulfur dioxide in the flue gas is oxidized into sulfate radical; pyritic sulfur in coal or the coal slime is also oxidized into sulfate radical; and generated sulfate radical reacts with limestone to form gypsum to be separated out. The adopted additive can increase a mass transfer reaction rate of sulfur dioxide in the slurry liquid, so that a flue gas desulfurization rate is increased. In addition, the additive can also increase a leaching rate of coal-series pyrite, so that a leaching efficiency is improved, and the sulfur content of the pyrite in the coal or the coal slime is reduced effectively.

The invention provides a method for removing hexavalent chromium in the process of preparing nickel-cobalt hydroxide from laterite nickel ore. In the method: before the high pressure acid leaching step, the laterite nickel ore slurry is preheated, and before the preheating step, a first reducing agent is added to the laterite nickel ore slurry, and then the laterite nickel ore added with the first reducing agent is made to The pulp enters the high-pressure acid leaching step; the first reducing agent is one or more of pyrite, sulfur and chromite, or is organic waste water; or, the second reducing agent is added to the leachate obtained in the circulating leaching step, Then enter the residual ore neutralization step; the second reducing agent is one of alkali metal or alkaline earth metal sulfite, pyrosulfite, ferrous salt, thiosulfate, sulfide salt, hydrogen sulfite or several. Using the method provided by this method, hexavalent chromium can be removed from the source on the basis of not changing the high pressure leaching process of laterite nickel ore, so as to prevent it from producing nickel cobalt hydroxide products, and it will not affect the original steps.

The invention discloses a method for desulfurization and denitrification of fume and coproduction of ammonium sulfate. The method comprises the steps that slurry is prepared by a solution containing hydroxy carboxylic acid ligands and pyrite powder, the slurry is used for washing the fume containing sulfur dioxide and nitric oxide, sulfur dioxide and oxygen in the fume react with pyrite, sulfur dioxide and pyritic sulfur are oxidized into sulfate radicals, ferrous generated by leaching the pyrite is combined with aminocarboxylic acid ligands to generate a ferrous complexing agent, the ferrous complexing agent complexes and absorbs nitric oxide in the fume, a complexation product nitrosyl complex continues to react by the action of the pyritic to generate ammonium radicals, and the ammonium radicals are combined with the sulfate radicals to generate ammonium sulfate. According to the method, with the adoption of the pyrite, oxidation degradation of the ferrous complexing agent is inhibited, and the nitrosyl complex continues to react to generate the ammonium radicals. In addition, ferrous ions and the like leached from the pyrite have a catalyst effect in oxidizing sulfur dioxide.