Sulfuric-acid residue sorting and refinement method

Abstract

The present invention relates to sulfuric acid slag separating and purifying process. The sulfuric acid slag separating and purifying process includes the following steps: making ore pulp with original slag in a stirrer, primary sorting in the first separating and purifying set, the first concentrating in the second separating and purifying set, the second concentrating in the third separating andpurifying set, optional third concentrating, and the centralized scavenging of the tail ore from the primary sorting and the concentrating. All the separating and purifying sets are slag separating and purifying sets in the patent of CN200410060867.2, with transverse water flushing amount of 100-300 ml / min and concentrated ore intercepting point of 20-50 mm. The apparatus for scavenging is a magnetic separator. The present invention has simple technological process, simple operation, low running cost and no secondary pollution.

Description

[0001] This invention is a divisional application of the original application "a sorting method and equipment for separation and purification of sulfuric acid slag". The filing date of the original application is September 17, 2004, and the application number of the original application is 200410060867.2 1. Technical field [0002] The invention belongs to the technical field of resource processing methods. In particular, it relates to a sorting method for separating and purifying sulfuric acid slag. 2. Technical background [0003] Sulfuric acid slag is a waste residue produced during the production and preparation of sulfuric acid. Under normal conditions, 0.8-0.9 tons of sulfuric acid slag should be discharged for every 1 ton of sulfuric acid produced. Sulfuric acid slag is produced in a wide range of places, and the annual discharge is astonishing. In addition to the accumulated sulfuric acid slag that has not been treated in time, the total amount is quite considerable....

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Problems solved by technology

[0005] One is due to problems such as complex production process, difficult process control, unstable product indicators, low utilization rate, and high operating cost. The processes used are:

[0006] Although the maglev combined process can obtain iron ore concentrate with a grade of 60.81% (Research on the Recycling and Utilization of Microfine Sulfuric Acid Slag, Ding Yunqing et al., Xinjiang Nonferrous Metals, 1997, No2), but due to insufficient surface activity of the roasted minerals, the floating The selection cannot be effectively sorted, and the effect is poor;

[0007] Although the sulfuric acid slag treated by the magnetic separation-shaking table separation process can obtain a grade of 58.90% sulfuric acid slag concentrate (the magnetic separation-shaking table separation process treats sulfuric acid slag, Shi Ling et al., Mining Engineering, 2001, No3), but it cannot be ruled out sulfur in concentrates;

[0008] Ore washing-grading-magnetic separation method can also obtain the concentrate containing 58.25% iron (simple method recovers iron from pyrite slag, Liu Xinxing et al., Comprehensive Utilization of Mineral Resources, June 1999), but in addition to complicated process In addition, it is impossible to effectively control the sulfur content in the concentrate;

[0009] The combined process of acid leaching-magnetic separation-flotation separation can obtain iron concentrate with an iron grade of 59.75% (experimental research on the recovery of iron in sulfuric acid slag, Wang Xuesong et al., Comprehensive Utilization of Mineral Resources, January 1998), but the process is complicated , high processing cost;

[0010] The high-temperature chlorination process of sulfuric acid slag can obtain iron concentrate with an iron grade of 63.41% (Comprehensive Utilization of Sulfuric Acid Slag in Tongling, Chu Qianshen, etc., Journal of Hebei Institute of Technology, November 2003), but involves high-temperature thermal work, and the process is complicated , high processing cost

[0011] Second, there is no special equipment for sorting sulfuric acid slag

At present, different sorting processes are used for sorting with the help of the original traditional equipment. Although these equipment can sort sulfuric acid slag to a certain extent, they are not completely suitable for the sorting characteristics of sulfuric acid slag. As a result, the separation efficiency Problems such as low quality, unstable product quality, high operating cost and complicated process

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