32results about How to "Stable stockpile" patented technology

The invention relates to a method for removing arsenic from smoke containing arsenic and solidifying arsenic. The method comprises the following steps that production of comprehensive recovering of valuable metal such as arsenic, antimony, lead and bismuth from smelting smoke containing arsenic, antimony and lead is conducted, and arsenic accumulation in a system is reduced to enable arsenic to be harmless. According to the method provided by the invention, through normal-pressure alkaline leaching, soluble arsenic in the smoke is removed, after trivalent arsenic in a leaching agent is changed to pentavalent arsenic through catalytic oxidation, a stable solid arsenic mineral is compounded through a lime arsenic precipitation method, and then the solid arsenic mineral is solidified through a cement solidifying mode; and leaching slag is subjected to the processes such as washing, reduction smelting and oxidizing blowing, and then all valuable elements are recycled to the maximum. According to the method, by removing arsenic from smoke and leaving antimony, lead, bismuth and the like in the arsenic removed slag as far as possible, separation of arsenic and the valuable metal and harmlessness can be achieved; the comprehensive using rate of the resources is high, the application range of raw materials is wide, the pollution problem in the extracting process of a traditional technique is solved, and particularly dust generated in the lead-zinc smelting process is avoided, and the advantage of the method is more obvious.

The invention relates to a method for comprehensive recovery of valuable metals from arsenic-containing dust and synthesis of arsenic-fixing minerals with an adjusted and controlled growth method. The method comprises the steps as follows: normal pressure water leaching, catalytic oxidation of a leaching solution, arsenic fixing of an oxidized solution with the adjusted and controlled growth method, washing of leaching residues and recovery of the valuable metals from washing residues. With the method, various valuable elements are recycled through procedures of normal pressure water leaching, catalytic oxidation of the leaching solution, arsenic fixing of the oxidized solution with the adjusted and controlled growth method, washing of the leaching residues, reduction smelting of the washing residues, oxidizing blowing and the like. With the method, the arsenic is removed from the dust, antimony, lead, bismuth and the like are left in the arsenic-removed residues as much as possible, depth separation of arsenic and antimony is realized, the high-stability arsenic-fixing minerals are obtained, meet national standards and can be piled safely, and recycling and harmless treatment of the arsenic-containing dust are realized. According to the method, the comprehensive utilization rate of resources is high, the raw material application range is wide, the problem of pollution in the extraction process of the traditional technology is solved, and the method has the more obvious advantages for the dust produced in the lead and zinc smelting process particularly.

The invention relates to a method for arsenic removal of arsenic-containing dust and comprehensive recycling of valuable elements. According to the method, production of comprehensive recovery of valuable metals such as arsenic, antimony, lead, bismuth and the like from smelting dust containing the arsenic, the antimony and the lead is performed, accumulation of the arsenic in the system is reduced, and harmless treatment is performed on the arsenic. With the method, through normal pressure alkaline leaching, soluble arsenic in the dust is removed, after trivalent arsenic in a leaching solution becomes pentavalent arsenic through catalytic oxidation, stable arsenic-fixing minerals are synthesized with the method for arsenic precipitation with lime and the precipitation transforming method and are solidified through piling, leaching residues are subjected to procedures of washing, reduction smelting, oxidizing blowing and the like, and the various valuable elements are recycled to the maximum extent. With the method, the arsenic is removed from the dust, the antimony, the lead, the bismuth and the like are left in the arsenic-removed residues as much as possible, and separation and harmless treatment of the arsenic and the valuable metals can be realized. According to the method, the comprehensive utilization rate of resources is high, the raw material application range is wide, the problem of pollution in the extraction process of the traditional technology is solved, and the method has the more obvious advantages for the dust produced in the lead and zinc smelting process particularly.

The invention relates to a method for preparing high-stability solid arsenic minerals through a distributed crystallization method. The method comprises the following steps: removing arsenic from a high-arsenic-content solution and curing the solution, so as to carry out harmless treatment on the arsenic-containing solution. According to the method disclosed by the invention, trivalent arsenic in the arsenic-containing solution is catalytically oxidized into pentavalent arsenic; and the oxidized solution is synthesized into the high-stability solid arsenic minerals through a lime arsenic settling method and the distributed crystallization method, and the high-stability solid arsenic minerals can be directly stockpiled. Calcium arsenate is obtained firstly through the lime arsenic settling method, and then the calcium arsenate is turned into the high-stability solid arsenic minerals through the distributed crystallization method; and toxicity extraction meets the specifications of GB5085.3-2007 (solid waste authentication standard-extraction toxicity authentication). The method is short in technological flow and good in arsenic settling effect; the solution subjected to arsenic settling can be directly discharged, and the synthesized solid arsenic minerals are high in stability and can be stably stockpiled within a wide pH range of 2 to 11 and under a strong reducing property condition.

The invention relates to a method for preparing high-stability arsenic fixing minerals through an adjusted and controlled growth process. The method comprises the step of removing arsenic from a high-arsenic solution and curing the high-arsenic solution, thereby realizing innocent treatment on an arsenic containing solution. According to the method, after trivalent arsenic in the arsenic-containing solution is converted into pentavalent arsenic through catalytic oxidation, the oxidized solution is synthesized into high-stability arsenic fixing minerals through a lime arsenic precipitation process-adjusted and controlled growth process, and the high-stability arsenic fixing minerals can be directly piled up. Calcium arsenate is firstly obtained through the lime arsenic precipitation process, and then calcium arsenate is converted into high-stability arsenic fixing minerals through the adjusted and controlled growth process, so that toxicity leaching meets regulations of GB5085.3-2007(solid waste identification standards-leaching toxicity identification). The method is short in technological process and is good in arsenic precipitation effect; the arsenic-precipitated solution can be directly exhausted, and the synthesized arsenic fixing minerals are high in stability, and can be stably piled up within a wide pH value range of 2-11 under strong reducing conditions.

The invention relates to a method for recycling valuable metals from arsenic-contained smoke dust and synthesizing a solid arsenic mineral through a precipitation transformation method. The method comprises the following steps of water leaching at the normal pressure, leaching liquid catalytic oxidizing, oxidized liquid arsenic solidifying, leaching residue cleaning and residue cleaning to recycle the valuable metals. According to the method, by water leaching at the normal pressure, soluble arsenic in the smoke dust is removed; leaching liquid is subjected to a catalytic oxidizing process, As3+ is oxidized to be As5+; oxidized liquid is subjected to an arsenic precipitating process and a precipitation transformation process to synthesize the high-stability solid arsenic mineral; and leaching residues is subjected to the processes of cleaning, reducing, smelting, oxidizing-blowing and the like, so that all valuable elements are recycled. The arsenic is removed from the smoke dust and solidified, antimony, lead, bismuth and the like remain in the leaching residues as far as possible, and the arsenic and the valuable metals are separated, and harmlessness is achieved. The resource comprehensive utilization rate is high, the applicable range of raw materials is wide, and the pollution problem of a traditional technology in the extraction process is solved; and the advantages of the method are more obvious especially for smoke dust generated in the lead and zinc smelting progress.