53results about How to "Small increase ratio" patented technology

The invention discloses a novel method for treating arsenic sulfide residue, belonging to the field of the treatment of hazardous wastes. In allusion to the deficiencies of the existing curing drugs, such as large compatibilization ratio, difficult landfill and the like, the invention discloses a method for treating arsenic sulfide residue via a stabilization drug; and by means of the method, thestabilization drug can have complicated physical-chemical reaction with the arsenic sulfide residue so that the leaching toxicity of the arsenic is reduced to the inlet requirement of hazardous wastelandfill sites. The method comprises the following steps: adding inorganic flocculating agent solution in the arsenic sulfide residue and mixing evenly; adding a solid powder adsorbent and mixing evenly; and finally adding asbestos wool to mix. According to the method provided by the invention, the process flow is simple, the operability is strong, the effect is remarkable, and the method is suitable for the treatment of arsenic-containing hazardous wastes.

The invention relates to an alkali activated solidification and stabilization treatment method of refuse incineration fly ash. The method comprises the following steps of: A: carrying out a pretreatment on the refuse incineration fly ash; B, then adding water and heavy metal stabilizing agents and fully stirring so as to fully integrate soluble heavy metals in the fly ash with the heavy metal stabilizing agents and then realizing a mineralization stability; C, adding alkali activating agents into fly ash slurry after finishing the B step and fully stirring; D, carrying out a heating treatment on a water bath after finishing the C sep, controlling a heating temperature and a heating time, and aperiodically stirring so as to uniformly heat the fly ash slurry materials; and E, finally shaping and maintaining the mixed materials so as to further blockade mineralized heavy metals in the fly ash and simultaneously solidify dioxin in the fly ash, and finally realizing the harmless solidification and stabilization of the fly ash. According to the method provided by the invention, the gelling reaction of the fly ash is generated by using the alkali activating agents to activate the fly ash activity only on a base of regulating the fly ash activity, and the double-effect stabilization of the fly ash is obtained by simultaneously supplementing the heavy metal stabilizing agents; moreover, the method has the advantages of low cost, good effect, low increase-volume rate and no secondary pollution.

The invention relates to a method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of an obtained solidified body. The method comprises the steps of adding aminodithioformic acid into the bottom mud polluted by heavy metals, stirring fully, adding cement, stirring the obtained mixture uniformly, and curing for 3d-14d to obtain the solidified body, so that a solidifying-stabilizing process is completed. The method has the advantages that the usage amount of the cement can be reduced, the cost is reduced, the capacity increasing rate of the solidified body is reduced, secondary pollution is avoided, the solidifying-stabilizing effect of the bottom mud polluted by heavy metals is improved, the cured solidified body can be used for landfill disposal or can serve as a building material.

The invention discloses a surface curing agent for fine-grain tailings and an application method thereof. The curing agent is composed of four components: sodium metasilicate solution, sodium metaaluminate solution, sodium carbonate solution and calcium chloride solution; The amount of sodium aluminate solution and sodium metaaluminate solution is determined according to the Si / Al molar ratio of the fine-grained tailings itself, and the CO in the curing agent 3 2‑ and Ca 2+ Concentrations are determined according to how the curing agent is used, and two methods of application of the curing agent are proposed. Under the calcification and hydration induced by metasilicate, metaaluminate and carbonate functional groups, tailings particles will generate geopolymer and calcium carbonate precipitation, and the compressive strength of the solidified body can reach about 1000-3500Kpa. The classification can reach the level of "strongly cemented soil or soft rock" to realize the cementation and fixation of tailings particles, so that the surface particles will not migrate with wind or rainwater runoff, and the leaching of heavy metals can be inhibited.

The invention discloses a diluting and conditioning method for sludge. According to the method, sludge floc structures are damaged through oxidation; hydrophilic organic groups are damaged and transformed into free components; meanwhile the molecular weight of organic macromolecular substance in sludge can be further reduced through the oxidation of hydrogen peroxide, breakage of binding bonds among high polymer skeletons is promoted, further bound water, capillary water and cell bound water in sludge floc colloid structures are released, and sludge viscidity is effectively reduced. The method for treating sludge subjected to non-standardized treatment lies in that sludge is subjected to diluting and conditioning treatment through the method; a cement-based mixing dehydration curing agent is added for sufficient stirring; the sludge is subjected to stabilized curing after dehydration curing, thereby meeting the requirement of sanitary landfill. The invention further discloses a laboratory and an industrial preparation method of the cement-based mixing dehydration curing agent. The method is simple in technology and low in cost, expands environment restoration technological approaches of sludge open storage grounds, and has high economic, social and environment benefits.

The invention provides a process and system for electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue. The method comprises the following steps: step 1: adding an oxidizing agent into the arsenic-containing waste residue with a water content being 50-70% and stirring to enable arsenic to be subjected to oxidizing reaction; applying an electric field to the arsenic-containing waste residue while adding the oxidizing agent, wherein a cathode of the electric field is positioned in the middle of the arsenic-containing waste residue, and an anode is positioned around the arsenic-containing waste residue, such that anions in the anion are migrated and aggregated to the anode; step 2: removing the electric field after the oxidizing reaction of the arsenic in the arsenic-containing waste residue is finished, then adding a stabilizing agent into the arsenic-containing waste residue and stirring, such that the arsenic in the arsenic-containing waste residue is reacted to be stabilized, and therefore, an arsenic compound that exists stably is obtained, wherein in the steps 1 and 2, percolate of the arsenic-containing waste residue is always filtered and collected. The process for the electric-field synergy stabilizing treatment of multivalence arsenic-containing waste residue is low in cost and wide in processing range, and the processed arsenic-containing waste residue is small in capacity-increase ratio and has no secondary pollution.

The invention discloses a method for treating refuse burning fly ash, which comprises steps as follows: (1) preparing a stabilizer solution from (by weight part) compounds containing pentahydroxy acetate 0.3-3, compounds containing dimethylamino sulfate 0.5-12 and water 20-50; (2) adding the stabilizer solution into 100 weight parts of refuse burning fly ash while stirring, and stirring to obtaina thick slurry; (3) adding 1-10 weight parts of compounds containing silicate into the thick slurry, and stirring to obtain a grout mixture; (4) feeding the grout mixture into an extruding machine, and extruding to obtain massive blanks; and (5) placing the blanks in a steam chamber, standing, curing, and conducting landfill disposal. The method has the advantages of low treatment cost, low volume-added ratio, and no secondary pollution; and can be widely used in treating refuse burning fly ash.