印度拉贾斯坦邦的小规模工业利用沉积岩作为原料生产石英粉，该地区约有65家注册企业参与制造，每天平均生产4至6吨成品。石英粉因其高纯度和高含量的二氧化硅被广泛用于制造感应炉衬里、陶瓷、耐火材料及瓷器等，并有10%的产品出口。制造过程中包括破碎、研磨、筛分等步骤，这些操作会产生含有大量游离二氧化硅的粉尘，长期暴露可能引发职业病如矽肺。
Quartz powder is manufactured by using sedimen-tary rock as a raw material in small-scale industry. There are 65 registered small-scale manufacturing enterprises employing about 650 workers located in and around Jaipur, Ajmer and Beawer in Rajasthan State, India. In each unit, five to ten workers are employed, of which 60 to 90% are women. On aver- age, each enterprise produces 4 to 6 tonnes of ?n- ished products per day.
A few more manufacturing enterprises are likely to arise in the near future due to the abundance of the natural resourceDsedimen- tary rockDin a large number of locations in the State. Sedimentary rock containing a high percen- tage of free silica is required for the manufacture of quartz powder, which goes down in size to ˉour-like fine powder, known as `remming mass’, which is uti- lised as a basic raw material in manufacturing in- duction furnace linings, ceramics, refractories and porcelain articles. Because of the high silica content and the high purity of the quartz powder, the country exports about 10% of this product.
The main processes and operations carried out are: stone crushing, grinding, sieving, screening, mixing, storing and bagging. The dust generated by each of these operations contains a very high amount of free silica, and exposure over a long period above the Permissible Limit of Exposure (Government of India, 1987) may lead to serious oc- cupational diseasesDsilicosis. Dust generated at the workplace also gets dispersed in the vicinity and causes health risk to the public and environment. Therefore, the present assessment of dust exposure and work environmental conditions has been carried out.
As the professional manufacturer of complete sets of mining machinery, such as sand maker,Cement machinery, Henan Hongxing is always doing the best in products and service.
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