After precipitation treatment, arsenic exists in the form of calcium arsenate and Iron arsenate, which is a dry and hazardous solid waste. There are eight common methods used to treat hazardous solid wastes: chemical, biological and physical methods. Chemical treatment of solid wastes containing arsenic is costly and in some cases produces air pollution. Large amounts of inorganic solid wastes have fewer applications. In addition, the toxicity of inorganic arsenic increases significantly when it is converted to volatile methylarsenic under biological action. Therefore, there is no suitable biological method to treat hazardous solid wastes containing arsenic. Physical methods are one of the very important methods in the environmentally sound treatment of hazardous wastes, especially for the long-term safe storage of toxic solids. The method is a treatment method that fixes or encapsulates hazardous substances in an inert solid matrix, i.e. cement encapsulation curing method.

　　The arsenic calcium slag was subjected to high-temperature heat treatment and cement curing, and its stability was evaluated by the TCLP method: after heat treatment at 800°C, the arsenic content in the solution was only 2.6 mg/l, which reached the standard for evaluating its stability by the TCLP method; with the increase of cement/arsenic calcium slag admixture, the arsenic content in the solution after immersion gradually decreased. When the ratio of cement to arsenic-containing calcium slag (containing 18.84% arsenic) is 1:1, it meets the standard of TCLP test. When the ratio of cement/calcium arsenic slag (containing 18.84% arsenic) was 1:1, the arsenic in the solution was basically unchanged in 4 days under the condition of pure water immersion, which showed strong stability. The high mass fraction of arsenic (w(sb)=40%-50% and w(as)>20%) in the dust produced by the reflection furnace smelting of lead anode slime makes it difficult to produce 2# antimony by direct fire at present. Pre-removal of arsenic from arsenic-containing soot by hydrogen peroxide leaching was investigated. After antimony precipitation, the arsenic was precipitated with lime and then solidified into bricks. Cement and high arsenic slag were cured into bricks at a mass ratio of 4:1. A 1cm thick cement protective layer was added to the surface of cement bricks. After drying, after 3D toxicity test, arsenic was not leached and the curing effect was obvious. The process provides an environmentally friendly and safe way for the treatment of arsenic and provides a new idea for the treatment of high arsenic materials.

　　Experiments were conducted for leaching arsenic-containing soot with sulfur dioxide, reducing arsenic-containing solution to arsenic trioxide with sulfur dioxide, leaching arsenic-containing soot with sulfuric acid cycles, and reducing arsenic-containing solution to arsenic trioxide with sulfur dioxide. The intermittent leaching tests showed that arsenic and zinc in lead and copper smelter dust could be effectively leached with 5%-10% sulfuric acid solutions, and that increasing the temperature, lengthening the reaction time, and increasing the concentration of sulfuric acid and slurry had little effect on the leaching rate of arsenic, zinc, or cadmium from the dust. A highly concentrated solution of pentavalent arsenic was obtained by circulating sulfuric acid leaching. When the leaching solution was in contact with sulfur dioxide at 90°C, arsenic was reduced to trivalent arsenic and precipitated as arsenic trioxide after cooling. when lead smelter dust was leached, the leaching residue was leached twice with sulfuric acid solution to recover indium. The total leaching rates of arsenic, zinc and cadmium were high as a result. High quality white arsenic was extracted from the roasting dust of arsenic-containing tin concentrates and other high arsenic dust generated during the roasting process. The arsenic-containing fume dust was leached with hot water, neutralized with soda and filtered. The filtrate is passed through dynamic ion exchange to remove impurities in depth.