38results about How to "Improve the level of comprehensive recycling" patented technology

The invention provides a microorganism used in high-arsenic high-carbon micro-fine particle refractory gold ore biological gold extraction technology, and the technology utilizing the microorganism to extract gold from high-arsenic high-carbon micro-fine particle refractory gold ore. The method comprises the following steps: after grinding and size mixing ore, adding the microorganism, and performing air agitation for pre-oxidation, wherein the period of pre-oxidation is 5 to 7 days; performing solid-liquid separation on the pre-oxidized ore pulp, adding lime into a supernatant liquor for neutralization, then decreasing arsenic in the neutralized supernatant liquor, and reusing the liquor for ore mixing; adding water into a bottom liquor to regulate the concentration of the ore pulp, and adding lime into the liquor to keep the pH within 11 and 12; and finally, extracting gold by adding sodium cyanide into the liquor with the pH ranging from 11 to 12, so as to obtain a gold-containing valuable liquor. The technology provided by the invention can fully utilizes the low-grade multiple refractory gold ore, improves the comprehensive utilization level of an ore mine, saves the cost, improves the profit, and facilitates development of low carbon economy of the metallurgical industry. The technology and the microorganism are particularly suitable for being applied to development of high-arsenic high-carbon Carlin-type gold deposits in golden triangle areas in Yunnan Province, Guizhou Province and Guangxi Province of China.

The invention relates to a selective bioleaching process of a high-sulphur/copper ratio secondary copper sulphide ore. In the process, microorganisms are utilized to leach the high-S/Cu ratio low-grade secondary copper sulphide ore, and the oxidation-reduction potential in the leaching process is controlled through the measures of regulating the pH, the dripping intensity, the fallow system, the air permeability, the breeding of dominant species, and the like so as to realize the selective leaching of the secondary copper sulphide ore. The process has short flow, simple equipment, low investment, low cost, no pollution, high recovery rate and adjustable production scale, can treat low-grade copper ore resources which cannot be treated by using the traditional selecting and smelting process, the resource utilization range is enlarged, and the comprehensive recovery level of copper metal is improved.

The invention discloses a recycling method for mineral processing waste water with high leaching residue content in zinc hydrometallurgy. In the recycling method, a P204 extract phase is used to extract zinc-bearing solution; waste electrolyte in a zinc-metallurgical electrolysis system is used to reextract a P204 organic extraction phase to allow zinc in the P204 organic extraction phase to enter the waste electrolyte; and reextraction solution returns to a zinc hydrometallurgy leaching system after deoiling. In the recycling method, zinc sulphide concentrate is added to the mineral processing waste water with mineral processing reagent content exceeding 200mg/L after filtration treatment to be mixed for primary adsorption; and the zinc sulphide concentrate can effectively absorb aerofloat in the mineral processing waste water and remove excessive mineral processing reagent from the mineral processing waste water. The zinc recycled by the recycle method can be conveniently applied to the existing facility; the reextraction solution can directly return to the zinc hydrometallurgy leaching system after the deoiling; the process produces no pollution; the recyclable zinc metallicity can be increased; and better economic benefit is achieved.

The invention discloses a method for preparing ammonium tetramolybdate by treating molybdenum-rich wastewater and waste slag, which comprises the following steps: 1. washing a molybdenum roasted product with water, concentrating wastewater, and uniformly mixing with an acid precipitation crystal mother solution in an ammonium molybdate production process, thereby obtaining a mixed solution; 2. adding a molybdenum roasted product into water-washed molybdenum roasted product ammonia leaching waste slag, adding into the mixed solution, regulating the pH value, magnetizing, and stirring to react to obtain a solid-liquid mixed slurry; 3. carrying out solid-liquid separation, and carrying out ammonia leaching on the filter cake; 4. carrying out solid-liquid separation to obtain an ammonia leaching solution and ammonia leaching slag; 5. carrying out ammonia leaching on the ammonia leaching slag; and 6. removing impurities from the ammonia leaching solution, purifying, carrying out acid precipitation, and filtering to obtain the solid ammonium tetramolybdate. The molybdenum roasted product-doped molybdenum roasted product ammonia leaching waste slag is added into the wastewater and acid precipitation mother solution, and liquid-phase magnetization is carried out to efficiently utilize the molybdenum resources in the wastewater and waste slag, thereby greatly lowering the treatment cost for molybdenum-containing waste slag and wastewater, being energy-saving and environment-friendly, and effectively enhancing the molybdenum resource utilization ratio in molybdenum roasted product water-washing concentrated wastewater and ammonia leaching waste slag.

The invention discloses a circulating water washing pretreatment process for domestic waste incinerator slag. The circulating water washing pretreatment process for the domestic waste incinerator slagcomprises the following steps: first, removing unburnt substances, such as reinforcing steel bars and wood blocks, in the domestic waste incinerator slag through manual sorting; and then, performingpretreatment processes of primary crushing, primary magnetic separating, water injecting secondary crushing, secondary magnetic separating, circulating water washing and the like so as to obtain a domestic waste incinerator slag renewable material which can be subjected to resource utilization. Through a series of treatment processes of crushing, magnetic separating, circulating water washing andthe like, the circulating water washing pretreatment process for the domestic waste incinerator slag provides a new method for treatment of the domestic waste incinerator slag, ensures the feasibilityof the resource utilization of the domestic waste incinerator slag, effectively relieves the treatment pressure of the domestic waste incinerator slag in an urbanization process, and has remarkable environmental and social benefits.

The invention relates to a method to recycle sodium-hydroxide from waste lye contained pigment. Wherein, collecting the said lye into storage tank that connects with membrane separation device by pipes and forms circulatory system; compressing by pump to force the lye circulated flow between the tank and membrane; the out flow filtrate is NaOH solution; with the out flow of filtrate, the pigment in original solution is enriching till the end of separation; the separation device uses ceramics, stainless steel membrane or organic membrane with bore diameter 0.3nm-800nm. This method needs no other auxiliary agent.

The invention discloses an efficient sulfur-oxidizing bacteria with a strain name of Acidithiobacillus thiooxidans Retech DW-II. The strain is preserved in China General Microbiological Culture Collection Center, Institute of Microbiology of the Chinese Academy of Sciences, No.3, Court No.1, Beichen West Road, Chaoyang District, Beijing on September 10, 2014, and has accession number of CGMCCNo. 9625. The invention also provides a rapid heating method for low-sulfur copper mine leaching process in Alpine region. The method comprises the steps of: crushing ore to -50mm, mixing with pyrite powder, conducting sulfuric acid slaking and granulation to improve the permeability of the stock heap and provide sufficient energy for bacteria; and finally adding the efficient sulfur-oxidizing bacteria CGMCC No. 9625. The method speeds up the initial rate of oxidation of the pyrite ore heap, and provides sufficient heat for the stock heap, so that temperature of the stock heap rapidly increases to above 40 DEG C.

The invention relates to a dynamic wave wet dust collection technology of a non-ferrous metallurgical furnace, which adopts a dynamic wave tower and a wet electrostatic mist eliminator for dust collection process. The technology is characterized in that a three-stage wet dust collection system is used for processing high-temperature flue gas discharged from a non-ferrous metallurgical furnace; thefirst stage adopts a primary dynamic wave tower for removing over 4 micrometer liquid drop containing dust; the second stage adopts a secondary dynamic wave tower for removing 3 to 4 micrometer liquid drop containing dust; and the third stage adopts a wet electrostatic mist eliminator for removing below 3 micrometer liquid drop containing dust. The technology has the advantages that the dust collection efficiency is greatly improved, the content of dust in discharged tail gas totally meet new national standards by further processing the filter liquor and flue dust, the recycle level of valuable elements of Ag and Se is improved, and the damage of noxious gas to environment and workers is reduced to the minimum.

The invention discloses a steel-concrete combined foundation pit supporting structure. The steel-concrete combined foundation pit supporting structure comprises a steel sheet pile, a ring beam, a secondary beam, a connecting steel bar and a bracket support. The steel sheet pile forms a waterproof structure, one end of the connecting steel bar is fixed to the steel sheet pile, the other end of theconnecting steel bar penetrates through the ring beam and extends into the secondary beam, and the bracket support is arranged below the secondary beam. According to the structural design, the steel-concrete combined foundation pit supporting structure is formed by effectively combining the steel sheet pile, the ring beam, the secondary beam, the connecting steel bar and the bracket support, the defects that a conventional foundation pit supporting construction speed is low and the part recovery rate is low are overcome, the foundation pit supporting construction efficiency is improved, and green recycling of parts is realized to a greater extent.

The invention relates to a straw raking machine which is formed by transversely installing multiple rake pillars on a rake shaft at intervals, wherein the rake shaft is installed on a rack; two clamp heads on the rack are connected with two traction pillars of a tractor; an ejector rob joint is connected to the tractor in a suspension mode; and a lifting rod is connected with the lifting arm of the tractor. Straw is collected into a stack through the traction of the tractor.

The invention discloses a method for treating desulfuration slag through a grating. According to the method, the assembled grating is placed in a desulfuration slag tank in advance, liquid slag pouring is conducted, segmentation or separation is conducted through the grating, and finally, natural segmentation is realized, so that production of 'large slag blocks' is avoided; and residual steel slag after treatment can also be used as a raw material for machining grating prefabricated panels and can be recycled. By the aid of the method, the level and the capability of recycling of slag steel can be strengthened, the efficiency of slag block treatment and the comprehensive utilization level are greatly improved, and environmental pollution and space waste are reduced.

The invention discloses a fertilizer-pesticide double-effect double-chelated multi-element multi-functional medical stone liquid fertilizer and a preparation method thereof. The liquid fertilizer is prepared by compounding and mixing raw powder of medical stones, soluble silicon, limestone, compound amino acid, ammonium phosphate, urea, potassium oxide, magnesium sulfate, ferrous sulfate, manganese sulfate, copper sulfate, boracic acid, zinc sulfate, ammonium molybdate, selenium powder, poly(potassium aspartate) and the like, a botanical pesticide composition agent prepared from ricin, veratrine, herba asari volatile oil, rotenone, clausena dunniana essential oil, coptis chinensis alkaloid and glycyrrhizic acid, an amino-oligosaccharin bacteriostatic agent, gibberellin, alum, DA-6, EDTA, hydrochloric acid, ethyl alcohol and the like. The preparation method of the liquid fertilizer comprises the steps that the raw materials are mixed and compounded to generate a hot-melting reaction with aqueous diluted hydrochloric acid, the materials and urea are added with water, mixed dissolving is conducted by increasing the temperature to 100 DEG C, then the reactants and the botanical pesticide composition agent are diluted, mixed, compounded and foamed to be mixed with synergistic liquid, the materials are heated until the temperature is 80 DEG C to 120 DEG C and dissolved and mixed, solid-liquid separation is conducted to remove residues, the obtained liquid is delivered into the reaction kettle to be subjected to secondary chelation with EDTA and DA-6, and then the high-concentration suspension type liquid fertilizer is prepared in a mixed mode.

The invention belongs to the technical field of chemical hydrogen production, and particularly discloses a thermal management system of large-scale hydrogen production equipment. The system comprisesa water tank, wherein a heat exchange tube is arranged at the bottom in the water tank, one end of the heat exchange tube communicates with an outlet of a waste liquid device, the other end of the heat exchange tube communicates with an inlet of a water collector, an inlet of the waste liquid device is connected with a reactor, and an outlet of the water collector is connected with a dryer; a circulating water pump and a radiator are further arranged outside the water tank, and the circulating water pump is used for pumping water in the water tank into the radiator for heat dissipation and returning the water to the water tank; and the heat exchange tube is a multi-pass U-shaped tube, a coil tube or a plurality of heat exchange calandria tubes. According to the system, heat generated by hydrogen production is used for supplying heat to low-temperature water, the heat exchange effect is good, power consumption is effectively saved, and liquid water supply required by a chemical hydrogenproduction reaction in a field low-temperature environment below 0 DEG C can be maintained; the long-term stability of the heat exchange effect can be ensured; and the regional water temperature difference can be reduced, and the influence on the hydrogen production reaction is avoided.

The present invention provides an iron alloy slag comprehensive treatment method, which comprises: mixing iron alloy slag and blast furnace water quenching slag, and conveying to a middle bin; conveying the mixed slag in the middle bin to a vertical roll mill; carrying out powder milling on the mixed slag by using the vertical roll moll to form powder while drying the mixed slag in the vertical roll mill and the powder by using a hot air furnace; conveying the dried powder to a powder sorting machine; and screening the dried powder through the powder sorting machine, wherein the qualified powder is collected by a dust collector, and the unqualified powder enters the vertical roll mill again so as to be subjected to power milling. With the iron alloy slag comprehensive treatment method of the present invention, the problem that the iron alloy slag utilization is low can be solved.