Innocent treatment method for arsenic containing mixed salt

Abstract

The invention relates to an innocent treatment method for arsenic containing mixed salt. The method comprises the following steps of: (1) uniformly mixing arsenic containing mixed salt and slag or / and cullet, and controlling the content of arsenic in the mixed material at1.0-4.8wt% to obtain a mixed material; (2) feeding the mixed material into a furnace, heating to 1150-1250 DEG C, and insulating and melting for 0.4-2.4 hours to obtain melt; and (3) pouring the melt to a die to prepare solid or entering into water for water-quenching while the melt is still hot to obtain particle arsenic containing solid. The method for treating the arsenic containing mixed salt is free from environmental hidden danger, and free from secondary pollution, and the whole process is simple in flow, short in processing time, simple and convenient to operate, low in energy consumption, and suitable for industrialized production.

Description

technical field [0001] The invention relates to a harmless treatment method for arsenic-containing mixed salt. Background technique [0002] Arsenic compounds are a class of chemical substances that are highly toxic to organisms, and their lethal dose for human poisoning is 0.1-0.2g (as As 2 o 3 It is an internationally recognized carcinogenic, mutagenic and teratogenic factor. [0003] Arsenic belongs to the thiophilic metalloid or semimetal elements. A variety of non-ferrous metal minerals in nature contain arsenic. In the process of mining, smelting, and extracting non-ferrous metals, arsenic is an unwanted and harmful impurity that needs to be removed. Since arsenic is easily oxidized, the method of adding alkali to oxidize is often used to remove arsenic. Lead, copper, nickel, antimony and other ores often contain arsenic. These metals are often added with sodium carbonate or sodium hydroxide to remove arsenic during the smelting process. The arsenic-containing sla...

AI Technical Summary

Problems solved by technology

This stockpiled arsenic-containing mixed salt often causes environmental pollution, and in severe cases, causes poisoning and even death of humans and animals.

[0005] CN1540005A disclosed a method for treating arsenic-containing materials on October 27, 2004. This method mainly removes arsenic by adding an arsenic-precipitating agent (such as sulfide). There are also environmental hazards

[0006] CN102965517A disclosed a treatment method for vitrification of arsenic-alkali slag on March 13, 2013. In this method, the arsenic-alkali slag is reacted with a carbon reducing agent in a molten state, and then antimony is recovered at 850°C to 1200°C, and finally Add glass melting agent at 850°C to 1300°C to melt arsenic-containing materials into glass. The disadvantage is that in the process of recycling antimony, arsenic is partially reduced to elemental arsenic and enters antimony, and it is difficult to separate antimony and arsenic. ; Part of the arsenic is reduced to arsenic trioxide and volatilizes into the environment

Although the obtained vitrified materials can be stacked safely, a large amount of arsenic trioxide gas is produced, which not only deteriorates the operating conditions, but also deteriorates the surrounding environment, causing secondary pollution.

[0007] CN102249609A disclosed a solidified body of arsenic-containing waste slag and its preparation method on November 23, 2011. The method is a curing agent, modifier, and aggregate prepared by treating arsenic-containing waste slag with industrial waste slag and mineral excitation materials. , water, etc., after mixing, molding, and curing of the mixture, it becomes a solidified body with high strength and low arsenic leaching rate. The disadvantages are that there are many processes, many materials used, complex processes, long processing time, and troublesome operation.