7 results about "Cadmia" patented technology

This invention belongs to the field of mineral processing technology, specifically relating to a selective sulfidation roasting-flotation separation method for a smithsonite-calcite mixed ore. The method first involves crushing and grinding the smithsonite, calcite, and sulfiding agent, then mixing them in a certain proportion and subjecting them to sulfidation roasting, preferentially causing the smithsonite to undergo sulfidation. After cooling the roasted product in an inert atmosphere, flotation separation is performed using xanthate as a collector to obtain zinc concentrate. By controlling the atmospheric conditions during the sulfidation roasting process, the sulfidation reaction efficiency of the smithsonite can be improved, and the generation of sulfur oxide gases during roasting can be reduced. When using this method to process the smithsonite-calcite mixed ore, effective recovery of the smithsonite can be achieved, with a flotation recovery rate exceeding 88%. This invention features a simple process flow and easily controllable operating conditions, providing a new technical approach for the efficient utilization of smithsonite resources.

The invention provides a method for enhancing the flotation effect of low-grade zinc oxide ore by adopting a composite collecting agent, and belongs to the technical field of lead zinc ore flotation. Starting from the thought of integrated selective regulation and control of the whole process of ore grinding, sedimentation and desliming, size mixing and lead floating and size mixing and selective zinc floating, sodium sulfide, water glass and a composite collecting agent are added step by step through all levels of flotation operation, and the flotation environment of smithsonite is regulated and controlled by developing a compound selective amine reagent. By means of the selective collecting effect of the composite collecting agent on smithsonite, the problems of high oxidation rate, sticky zinc oxide ore foam, low recovery rate, poor selectivity, high cost and the like are solved, the zinc recovery rate and the concentrate grade of the low-grade zinc oxide ore are improved, and efficient flotation recovery of the low-grade zinc oxide ore with the high oxidation rate is achieved. The technological process is simple and convenient, industrial production is easy, the zinc oxide ore containing calcium-containing minerals such as calcite and dolomite has good selectivity, and better zinc oxide flotation indexes can be obtained.

The present application provides a method for determining the zinc mineral content and the metal distribution characteristics of zinc in copper-zinc-iron skarn-type ores associated with gold and silver, belonging to the technical field of process mineralogy. The method comprises crushing, fine grinding, and flotation of the sample to be tested to obtain zinc concentrate, and using MLA test to obtain the type of zinc minerals and the relative content M i ', introduce the first correction coefficient L to calculate the actual relative content of zinc minerals M i Then, the zinc concentrate was processed to obtain hemimorphite, sphalerite, sphalerite and smithsonite, and MLA optical sections were prepared for each of them. The zinc content Zn was calculated by scanning electron microscopy. i ', introduce the second correction coefficient K, calculate the distribution of zinc in zinc concentrate in hemimorphite, sphalerite, sphalerite and smithsonite Zn i , that is, the distribution of zinc metal in the zinc concentrate is obtained. This application improves the accuracy of the test of the relative content of zinc minerals and the zinc metal distribution characteristics by introducing correction coefficients L and K, which is beneficial to the selection of mineral processing processes and reduces the waste of zinc resources in smelting.

The present invention discloses a method for leaching zinc phase in zinc ore, which adopts hydrochloric acid-stannous chloride solution to selectively dissolve the smithsonite phase. Stannous chloride can effectively inhibit the Fe 3+ The hydrochloric acid system avoids dissolving hemimorphite in the oxidation of sphalerite, ensuring the accuracy of the zinc content determination results in the smithsonite phase; a hydrogen peroxide solution is used to selectively dissolve sphalerite, avoiding the use of saturated bromine water as a leaching agent, making it more environmentally friendly, significantly shortening the subsequent leachate treatment time, improving detection efficiency, reducing the workload of detection personnel, and facilitating industrial on-site application; it is proposed that the zinc oxidation rate in zinc ore be calculated by dividing the sum of the zinc content in smithsonite and hemimorphite by the total amount of zinc in each phase of smithsonite, sphalerite and hemimorphite, rather than dividing by the total zinc content in the sample. Calculating the oxidation rate in this way can effectively eliminate the influence of systematic errors caused by the instruments and environment during the phase separation process.

The invention discloses a low-grade zinc oxide ore amine sulfide process defoaming agent and application thereof.The low-grade zinc oxide ore amine sulfide process defoaming agent is characterized in that firstly, ore is crushed and ground to achieve monomer dissociation between minerals, and meanwhile, a small amount of sodium carbonate and sodium sulfide are added into a grinding machine to serve as regulators; lS-X1 is used as a selective defoaming agent for amine sulfide flotation of smithsonite, and zinc sulfide concentrate is obtained after a section of roughing operation; and sodium sulfide and sodium carbonate are added into the zinc sulfide tailings for activation, and zinc oxide concentrate and tailings are obtained after the one-roughing, one-refining and one-scavenging flotation process. The efficient flotation defoaming agent LS-X1 has high selective defoaming capacity, has high defoaming capacity on amine collecting agents, does not affect the flotation performance of the amine collecting agents, and can greatly reduce the foam stability of the amine collecting agents, so that flotation closed cycle can be carried out; the method has the advantages of high feasibility, wide application range, high product index and the like.

High-silicon gangue type low-grade zinc oxide ore high-efficiency beneficiation method, using fatty acid collector preferentially desiliconized flotation carbonate + carbonate concentrate amine + xanthate zinc sulfidation combined process, obtain low SiO2 impurity content of zinc oxide concentrate, realize the efficient recovery of high-silicon gangue type low-grade zinc oxide ore, including the following steps and conditions: one stage grinding, grinding fineness -0.074mm accounts for 40~60%, using sulfuric acid to adjust the pulp, using fatty acid collector to rough select carbonate, adding inhibitor to rough selection foam to carry out 3 times of cleaning, obtain carbonate concentrate with preliminary enrichment of zinc spar, the dissociation degree of zinc spar in the ore reaches more than 85%; carbonate concentrate adding inhibitor, using amine + xanthate sulfidation process to rough select zinc oxide, adding inhibitor to rough selection foam to carry out 4 times of cleaning, obtain zinc oxide concentrate; adding amine + xanthate combined collector to the tailings of rough selection to carry out scavenging, the middlings of cleaning and the concentrate of scavenging are returned in sequence. It has the advantages of obtaining higher grade zinc oxide concentrate, reducing production cost and improving the utilization rate of silicon gangue type low-grade zinc oxide ore.

The invention discloses a method for extracting zinc from low-grade smithsonite, and belongs to the technical field of wet smelting. Comprising the following steps that smithsonite is ground and screened, and to-be-treated smithsonite is obtained; carrying out calcination pretreatment on the obtained smithsonite; the calcined smithsonite is leached with a sulfuric acid solution prepared by adding manganese dioxide, the PH value of the leaching end point is controlled to be 4.8-5.0, and neutral leaching is achieved; leaching the bottom slag obtained by leaching with a dilute sulfuric acid solution again to recover zinc, and controlling the pH value at the leaching end point to be 2.0, namely acid leaching; and pulpifying and washing the obtained leaching residues with fresh water, and then carrying out filter pressing. According to the method, a pyrogenic calcination process and a wet conventional leaching process are combined, high-acid leaching is adopted in the leaching process in the wet conventional leaching process, and a hydrolysis iron removal process is adopted in the acid leaching process in a low-acid and low-iron environment. The production environment pressure of overflow caused by large foam amount in the leaching process is relieved; iron continuously enriched in the leaching process is removed; and the zinc concentration required by electrolysis production is met.